Patent Publication Number: US-2023150006-A1

Title: Die

Description:
TECHNICAL FIELD 
     The present disclosure relates to a die, more specifically, a die used for hot pressing. 
     BACKGROUND ART 
     As a method for forming high-strength parts such as automobile body parts, hot pressing has been known. In the hot pressing, a heated blank is pressed with dies attached to a press machine, and thereafter the formed article is cooled and quenched in the dies. The formed article is cooled, for example, by refrigerant ejected from the forming surface of a die. 
     Patent Literature 1 discloses a die having a refrigerant ejection function. In this die, a plurality of refrigerant supply tubes that pass through the inside and open at the forming surface are located. Each of the refrigerant supply tubes is provided with an opening/closing valve, a flow rate regulating valve, and a pressure regulating valve. By controlling these valves, parameters such as an ejection amount, an ejection flow rate, an ejection pressure, an ejection time, an ejection timing, and the like of the refrigerant from the refrigerant supply tubes are controlled. 
     In the die of Patent Literature 1, valves for controlling the ejection of the refrigerant are provided in each of the refrigerant supply tubes. Therefore, when cooling the formed article, it is necessary to control the plurality of valves at the same time, thus the problem is that the ejection control of refrigerant is complicated. 
     On the other hand, the die disclosed in Patent Literature 2 includes a die body including a forming surface and a refrigerant container to be housed inside the die body. The die body is provided with a plurality of die supply holes that open at the forming surface. A plurality of container supply holes are provided on the wall portion of the refrigerant container. As a result of the refrigerant container being moved up and down or rotated in the die body, each of the container supply holes and a die supply hole are brought into a communication state or a non-communication state. When the container supply hole and the die supply hole come into communication with each other, the refrigerant is supplied from the refrigerant container to the formed article on the forming surface through the container supply hole and the die supply hole. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Patent Application Publication No. 2006-198666 
     Patent Literature 2: Japanese Patent Application Publication No. 2007-136535 
     SUMMARY OF INVENTION 
     Technical Problem 
     In the die of Patent Literature 2, by bringing the container supply hole and the die supply hole into communication by moving up and down or rotating the refrigerant container, it is possible to supply refrigerant to the formed article without performing complicated ejection control by a plurality of valves. However, in Patent Literature 2, since the refrigerant container is disposed inside the die body, it is necessary to form a cavity inside the die body. Therefore, the problem is that the strength of the die decreases. 
     An objective of the present disclosure is to provide a die that can secure strength and easily supply refrigerant to a formed article. 
     Solution to Problem 
     The die according to the present disclosure includes a die base, a die body, and an opening/closing member. In the die base, a storage portion for storing refrigerant is formed. The die body is mounted to the die base. The die body includes a mounting surface, a forming surface, and a plurality of flow channels. The mounting surface is located on the storage portion side of the die base. The forming surface is located on the opposite side to the mounting surface. The plurality of flow channels pass through the die body from the mounting surface toward the forming surface. The opening/closing member is disposed between the die base and the die body. The opening/closing member includes a plurality of through holes corresponding to the plurality of flow channels. The opening/closing member is configured to be movable with respect to the die base and the die body such that each of the through holes brings the corresponding flow channel and the storage portion into communication. 
     Advantageous Effects of Invention 
     The die according to the present disclosure can secure strength and easily supply refrigerant to a formed article. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic diagram showing a press machine. 
         FIG.  2    is an exploded view of a die according to a first embodiment. 
         FIG.  3    is a sectional view in a plane perpendicular to the longitudinal direction of the die in a non-communication state. 
         FIG.  4    is a schematic diagram for explaining overlapping between a through hole of an opening/closing member and a flow channel of a die body in a non-communication state. 
         FIG.  5    is a sectional view in a plane perpendicular to the longitudinal direction of the die in a communication state. 
         FIG.  6    is a schematic diagram for explaining overlapping between a through hole of the opening/closing member and a flow channel of the die body in a communication state. 
         FIG.  7    is a schematic diagram for explaining overlapping between a through hole and a flow channel, which have different widths from each other in the sliding direction. 
         FIG.  8    is a schematic diagram for explaining overlapping between a through hole and a flow channel, which have different widths from each other in the sliding direction. 
         FIG.  9    is a schematic diagram for explaining overlapping between a through hole and a flow channel, which have different widths from each other in the sliding direction. 
         FIG.  10    is a schematic diagram for explaining overlapping between a through hole and a flow channel, which have different widths from each other in a direction perpendicular to the sliding direction. 
         FIG.  11    is a schematic diagram for explaining overlapping between a through hole and a flow channel, which have different widths from each other in a direction perpendicular to the sliding direction. 
         FIG.  12    is a schematic diagram for explaining overlapping between a through hole and a flow channel, which have different widths from each other in the sliding direction and a direction perpendicular to the sliding direction. 
         FIG.  13    is a schematic diagram for explaining overlapping between a through hole and a flow channel, which have different widths from each other in the sliding direction and a direction perpendicular to the sliding direction. 
         FIG.  14    is a schematic diagram for explaining overlapping between a through hole and a flow channel, which have different widths from each other in the sliding direction and a direction perpendicular to the sliding direction. 
         FIG.  15    is a sectional view in a plane perpendicular to the longitudinal direction of a die according to a second embodiment. 
         FIG.  16    is a schematic diagram for explaining overlapping between a through hole of the opening/closing member and a flow channel of the die body in the second embodiment. 
         FIG.  17    is a schematic diagram for explaining overlapping between a through hole of the opening/closing member and a flow channel of the die body in the second embodiment. 
         FIG.  18    is a schematic diagram for explaining overlapping between a through hole of the opening/closing member and a flow channel of the die body in the second embodiment. 
         FIG.  19    is a schematic diagram for explaining overlapping between a through hole of the opening/closing member and a flow channel of the die body in the second embodiment. 
         FIG.  20    is a schematic diagram for explaining overlapping between a through hole of the opening/closing member and a flow channel of the die body in another example of the second embodiment. 
         FIG.  21    is a schematic diagram for explaining overlapping between a through hole of the opening/closing member and a flow channel of the die body in another example of the second embodiment. 
         FIG.  22    is a schematic diagram for explaining overlapping between a through hole of the opening/closing member and a flow channel of the die body in another example of the second embodiment. 
         FIG.  23    is a schematic diagram for explaining overlapping between a through hole of the opening/closing member and a flow channel of the die body in another example of the second embodiment. 
         FIG.  24    is a schematic diagram showing another example of the opening/closing member. 
         FIG.  25    is a sectional view in a plane perpendicular to the longitudinal direction of the die in another example of the embodiments. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The die according to an embodiment includes a die base, a die body, and an opening/closing member. In the die base, a storage portion for storing refrigerant is formed. The die body is mounted to the die base. The die body includes a mounting surface, a forming surface, and a plurality of flow channels. The mounting surface is located on the storage portion side of the die base. The forming surface is located on the opposite side to the mounting surface. The plurality of flow channels pass through the die body from the mounting surface toward the forming surface. The opening/closing member is disposed between the die base and the die body. The opening/closing member includes a plurality of through holes corresponding to the plurality of flow channels. The opening/closing member is configured to be movable with respect to the die base and the die body such that each of the through holes brings the corresponding flow channel and the storage portion into communication (first configuration). 
     In the first configuration, the storage portion for storing refrigerant is formed in the die base. Therefore, since it is not necessary to provide a large cavity for storing refrigerant in the die body including the forming surface, the strength of the die can be secured. Further, in the first configuration, an opening/closing member is disposed between the die base and the die body. A plurality of through holes are formed in the opening/closing member corresponding to the plurality of flow channels provided in the die body. In order to bring the flow channels of the die body and the storage portion of the die base into communication, simply this opening/closing member may be moved. In other words, moving the opening/closing member will result in communication between each flow channel of the die body and the storage portion of the die base through the plurality of through holes provided in the opening/closing member so that the refrigerant in the storage portion is ejected from the forming surface through each flow channel of the die body. Therefore, according to the first configuration, it is possible to easily supply refrigerant to a formed article without performing complicated control by a plurality of valves. 
     In the first configuration, it is preferable that the opening/closing member has a plate shape and is slidable with respect to the die base and the die body (second configuration). 
     According to the second configuration, by sliding the plate-shaped opening/closing member, it is possible to move all through holes, thereby bringing the plurality of flow channels of the die body and the storage portion of the die base into communication. Further, since the plurality of through holes can be efficiently provided on one opening/closing member, it is possible to efficiently perform ejection control of refrigerant from the plurality of flow channels. 
     In the second configuration, the plurality of through holes may include a first through hole and a second through hole. In the sliding direction of the opening/closing member, and/or a direction perpendicular to the sliding direction, the width of the second through hole is larger than the width of the first through hole (third configuration). 
     The time for which a flow channel of the die body and the storage portion of the die base are in communication, that is, the time for which refrigerant from the storage portion is supplied to the formed article through the flow channel, is determined mainly according to the width of the corresponding through hole in the sliding direction of the opening/closing member. The flow rate per unit time of the refrigerant supplied to the formed article is mainly determined according to the width of the through hole in the direction perpendicular to the sliding direction of the opening/closing member. According to the third configuration, the width in the sliding direction and/or a direction perpendicular to the sliding direction is different between the first through hole and the second through hole. Therefore, the supply time of the refrigerant and/or the flow rate per unit time of the supplied refrigerant can be changed between the flow channel corresponding to the first through hole and the flow channel corresponding to the second through hole. Therefore, it is possible to appropriately set the cooling time, cooling speed, and the like for each region of the formed article. 
     In the second or third configuration, the opening/closing member may slide in two axial directions with respect to the die base and the die body (fourth configuration). 
     In a case in which the plate-shaped opening/closing member slides only in a single axial direction, when the communication state and the non-communication state between the flow channel of the die body and the storage portion of the die base are switched, the opening/closing member is simply moved back and forth. For example, when the opening/closing member is slid to one side in the above described axial direction, the through hole of the opening/closing member overlaps the flow channel of the die body, and the flow channel and the storage portion are brought into a communication state. If the opening/closing member is further slid, the through hole of the opening/closing member passes the flow channel of the die body, and deviates from the flow channel so that the flow channel and the storage portion are brought into a non-communication state. Thereafter, since the opening/closing member follows the same path to return to the original position, the flow channel and the storage portion are brought into a communication sate again until the opening/closing member returns to the original position. In contrast to this, according to the fourth configuration, since the opening/closing member which has been slid in one axial direction and has reached the end point via a communication state and a non-communication state can be slid in another axial direction, the opening/closing member can be returned to its original position in a path different from the outbound path. Therefore, it is possible to prevent the flow channel and the storage portion, which has once been brought into a non-communication state, from being brought into a communication state again. In other words, the opening/closing member can be returned to the initial position while stopping the supply of refrigerant to the formed article. 
     In any of the first to fourth configurations, the die base may have a plurality of grooves at the surface. The plurality of grooves are in communication with each other and configure the storage portion (fifth configuration). 
     According to the fifth configuration, the storage portion is configured by a plurality of grooves provided at the surface of the die base. Therefore, for example, the storage amount of refrigerant in the storage portion can be reduced compared with the case where the storage portion is a single concave portion. Therefore, in particular, when supply of refrigerant to the storage portion is started in a state in which the storage portion is not filled with refrigerant, it is possible to reduce the time from when supply of refrigerant to the storage portion of the die base is started until when the refrigerant is stored in the storage portion allowing the refrigerant to flow into each flow channel of the die body. Further, by configuring the storage portions by the plurality of grooves being in communication with each other, it is possible to integrate piping systems to be connected to the die base, thereby allowing the diameter of the pipe connected to the die base to be expanded. Therefore, the pressure loss of the refrigerant to be supplied to the storage portion can be suppressed. Furthermore, it is possible to compensate for the decrease in the flow rate of refrigerant in the communication portion between the flow channel and the storage portion of the die body, and the flow rate of refrigerant ejected from the forming surface through the flow channel can be stabilized. 
     Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The same or equivalent configuration is given the same reference signal in each figure, and the same description will not be repeated. 
     First Embodiment 
     Configuration of Press Machine  100   
       FIG.  1    is a schematic diagram showing a press machine  100 . The press machine  100  is provided with dies  10  and  20 .  FIG.  1    is a diagram to show the press machine  100  viewed from the front. In the present embodiment, the direction perpendicular to the paper surface of  FIG.  1    is referred to as a depth direction of the press machine  100 . 
     The press machine  100  includes a main body frame  30 , a slide  40 , a bolster  50 , and a base plate  60 . 
     The slide  40  is mounted to the main body frame  30 . The slide  40  moves up and down with respect to the main body frame  30  by operation of a hydraulic cylinder, a flywheel, or the like housed in the main body frame  30 . The slide  40  holds the die  20 . 
     The bolster  50  is disposed below the slide  40 . The base plate  60  is fixed onto the bolster  50 . The base plate  60  has a concave shape. The die  10  is mounted to the base plate  60 . The base plate  60  adjusts the position of the die  10  in the vertical direction. The die  10  faces the die  20 . 
     The die  10  extends in the depth direction of the press machine  100 . Hereinafter, with respect to the die  10 , the depth direction of the press machine  100  is referred to as the longitudinal direction, and the direction perpendicular to the longitudinal direction and the vertical direction is referred to as a lateral direction.  FIG.  2    is an exploded view of the die  10 . The die  10  includes a die body  11 , a die base  12 , and an opening/closing member  13 . 
     The die body  11  includes a forming surface  111  and a mounting surface  112 . The forming surface  111  is the upper surface of the die body  11 . The mounting surface  112  is located on the opposite side of the forming surface  111 . In other words, the mounting surface  112  is the lower surface of the die body  11 . The mounting surface  112  is generally flat. 
     In the present embodiment, the die body  11  has an approximate hat shape as viewed from the longitudinal direction. In other words, the die body  11  includes a punch part  11 A and flange parts  11 B. 
     The punch part  11 A is disposed at the middle in the lateral direction of the die body  11 . The punch part  11 A includes a top surface  11 Aa and side surfaces  11 Ab. The side surfaces  11 Ab are located on both sides of the top surface  11 Aa. Each of the side surfaces  11 Ab is inclined with respect to the vertical direction outward in the lateral direction as they are closer to the bottom from the top surface  11 Aa. On the lower surface of the die  20  ( FIG.  1   ), a concave portion corresponding to the punch part  11 A is formed. 
     Each flange part  11 B protrudes outward in the lateral direction from the punch part  11 A. The upper surface  11 Ba of the flange part  11 B is connected to the lower end of the side surface  11 Ab of the punch part  11 A. The top surface  11 Aa and the side surfaces  11 Ab of the punch part  11 A, and the upper surface  11 Ba of each flange part  11 B constitute the forming surface  111  of the die body  11 . 
       FIG.  3    is a cross-section (a sectional view in a plane perpendicular to the longitudinal direction) of the die  10 . Referring to  FIG.  3   , the die body  11  further includes a plurality of flow channels  113 . In the example of the present embodiment, the plurality of flow channels  113  are arranged at equal intervals in the longitudinal direction in the die body  11 . Further, the flow channels  113  are also arranged at equal intervals in the lateral direction of the die body  11 . However, the plurality of flow channels  113  may not be arranged at equal intervals in the longitudinal or lateral direction of the die body  11 . Each of the flow channels  113  passes through the die body  11  from the mounting surface  112  to the forming surface  111 . The flow channel  113  extends in the vertical direction in the die body  11 . The flow channel  113  may include a branch flow channel  1131  extending in the lateral direction. The lower end of the flow channel  113  opens at the mounting surface  112 . The upper end  1132  of the flow channel  113  and the front end  1133  of the branch flow channel  1131  open at the forming surface  111 . 
     More specifically, the upper ends  1132  of the flow channels  113  open at the top surface  11 Aa of the punch part  11 A and the upper surfaces  11 Ba of the flange parts  11 B. The front end  1133  of the branch flow channel  1131  opens at the side surface  11 Ab of the punch part  11 A. The sectional shape of each flow channel  113  is, for example, circular. However, the flow channel  113  may have a sectional shape other than a circle. The sectional area of each flow channel  113  may be different from or the same as each other. For example, the sectional area of the flow channel  113  in the punch part  11 A is larger than the sectional area of the flow channel  113  in the flange part  11 B. Each branch flow channel  1131  is provided in a flow channel  113  located near either of the side surfaces  11 Ab, among the flow channels  113  in the punch part  11 A. The sectional area of each branch flow channel  1131  may also be different from or the same as each other. 
     A plurality of flow channels  114  separate from the flow channels  113  are also formed in the die body  11 . In the example of the present embodiment, the plurality of flow channels  114  are arranged at equal intervals in the longitudinal direction in the die body  11 . Further, the flow channels  114  are also arranged at equal intervals in the lateral direction of the die body  11 . However, the plurality of flow channels  114  may not be arranged at equal intervals in the longitudinal direction or the lateral direction of the die body  11 . Each of the flow channels  114  passes through the die body  11  from the mounting surface  112  toward the forming surface  111 . The flow channel  114  extends in the vertical direction in the die body  11 . The flow channel  114  may include a branch flow channel  1141  extending in the lateral direction. The lower end of the flow channel  114  opens at the mounting surface  112 . The upper end  1142  of the flow channel  114  and the front end  1143  of the branch flow channel  1141  open at the forming surface  111 . 
     More specifically, the upper ends  1142  of the flow channels  114  open at the top surface  11 Aa of the punch part  11 A and the upper surfaces  11 Ba of the flange parts  11 B. The front end  1143  of the branch flow channel  1141  opens at the side surface  11 Ab of the punch part  11 A. The sectional shape of each flow channel  114  is, for example, circular. However, the flow channel  114  may have a sectional shape other than a circle. The sectional area of each flow channel  114  may be different from or the same as each other. For example, the sectional area of the flow channel  114  in the punch part  11 A is larger than the sectional area of the flow channel  114  in the flange part  11 B. The branch flow channel  1141  is provided in a flow channel  114  in the punch part  11 A. The sectional area of each branch flow channel  1141  may also be different from or the same as each other. 
     The die base  12  is disposed below the die body  11 . The die body  11  is mounted to the die base  12 . The die base  12  has a substantially cuboid shape. A concave-shaped storage portion  122  is formed at the surface  121  on the die body  11  side of the die base  12 . The refrigerant is stored in the storage portion  122 . At the surface opposite to the surface  121 , a concave-shaped discharge portion  123  is formed in order to discharge the refrigerant after use. The die base  12  also has a through path  126  extending from the discharge portion  123  toward the surface  121 . 
     Referring to  FIG.  2    again, the die base  12  has a plurality of grooves  124  and  125  configuring the storage portion  122 , at the surface  121 . The plurality of grooves  124  respectively extend in the longitudinal direction, viewed from above, that is, in a plan view of the die base  12 . In the example of the present embodiment, the grooves  124  are located in parallel to each other. However, each groove  124  may be inclined with respect to other grooves  124 .  FIG.  2    shows a case where the storage portion  122  has seven grooves  124 . The grooves  124  are located, for example, at equal intervals in the lateral direction. However, the grooves  124  may be located at unequal intervals. The width, depth, and length of each groove  124  are preferably the same. One ends of the grooves  124  are connected by a groove  125  extending in the lateral direction. The other ends of the grooves  124  are connected by another groove  125  extending in the lateral direction. In other words, the plurality of grooves  124  and  125  are in communication with each other. 
     The storage portion  122  is disposed at the middle part in the longitudinal direction at the surface  121  of the die base  12 . The middle part is slightly recessed compared with other portions. 
     The opening/closing member  13  is placed on the concave-shaped middle part at the surface  121  of the die base  12 . The opening/closing member  13  has a solid plate-shape. The opening/closing member  13  has, for example, a substantially rectangular shape in a plan view. The opening/closing member  13  is a member separate from the die body  11 , and is disposed outside the die body  11 . More specifically, the opening/closing member  13  is disposed between the die base  12  and the die body  11 . The opening/closing member  13  is sandwiched by the mounting surface  112  of the die body  11  and the surface (upper surface)  121  of the die base  12 . It is preferable that a sealant not shown is disposed between the lower surface of the opening/closing member  13  and the surface  121  of the die base  12 , and between the upper surface of the opening/closing member  13  and the mounting surface  112  of the die body  11 . 
     The opening/closing member  13  includes a plurality of through holes  131  and a plurality of through holes  132 . The plurality of through holes  131  are arranged in the longitudinal direction and the lateral direction of the die  10 . The plurality of through holes  132  are also arranged in the longitudinal direction and the lateral direction of the die  10 . In the example of the present embodiment, a through hole  132  is arranged between longitudinal rows and between lateral rows of the through holes  131 . The through holes  132  are located so as to be deviated in position from the through holes  131  in the longitudinal direction and the lateral direction. However, the arrangement of the through holes  131  and  132  is not limited to this and can be determined appropriately. 
     The plurality of through holes  131  are formed in the opening/closing member  13  corresponding to the plurality of flow channels  113  ( FIG.  3   ) of the die body  11 . For example, the through holes  131  are arranged at the same interval as that of the flow channels  113  in the longitudinal direction of the die  10 . For example, the through holes  131  are arranged at the same interval as that of the flow channels  113  even in the lateral direction of the die  10 . In the present embodiment, the number of through holes  131  is the same as that of flow channels  113 . However, the number of through holes  131  may be different from the number of flow channels  113 . 
     The plurality of through holes  132  are formed in the opening/closing member  13  corresponding to the plurality of flow channels  114  ( FIG.  3   ) of the die body  11 . For example, the through holes  132  are arranged at the same interval as that of the flow channels  114  in the longitudinal direction of the die  10 . For example, the through holes  132  are arranged at the same interval as that of the flow channels  114  even in the lateral direction of the die  10 . In the present embodiment, the number of through holes  132  is the same as that of flow channels  114 . However, the number of through holes  132  may be different from the number of flow channels  114 . 
     Each of the through holes  132  brings the corresponding flow channel  114  and the discharge portion  123  of the die base  12  into communication. 
     In the example of the present embodiment, each of the through holes  131  and  132  has a circular shape. However, each of the through holes  131  and  132  may not have a circular shape. Each of the through holes  131  and  132  may have, for example, a semi-circular, elliptic, semi-elliptic, or polygonal shape. Further, the opening area of each of the through holes  131  and  132  may be different from or the same as each other. 
     The opening/closing member  13  is configured to be movable with respect to the die base  12  and the die body  11  such that each of the through holes  131  brings the corresponding flow channel  113  and the storage portion  122  into communication. A driving unit  133  is mounted to the opening/closing member  13 . For example, the driving unit  133  is an actuator such as a hydraulic cylinder, an electric slider, or the like. The driving unit  133  causes the opening/closing member  13  to slide in the lateral direction. 
     Operation of Press Machine  100   
     Next, the operation of a press machine  100  when producing a formed article will be described. Referring to  FIG.  1   , first, a heated blank (not illustrated) is placed on the die  10 . Next, the die  20  is lowered by lowering the slide  40 . Thereby, the blank is pressed by the die  20  and the die  10 . After the die  20  reaches the bottom dead center, refrigerant is ejected from the forming surface of the die  10 , and the formed article (not illustrated) is cooled in the dies  10  and  20 . 
     Referring to  FIGS.  3  to  6   , the operation of the die  10  when cooling the formed article will be described.  FIGS.  3  and  4    are diagrams showing the positional relationship between the die body  11  and the die base  12 , and the opening/closing member  13  before the start of cooling.  FIGS.  5  and  6    are diagrams showing the positional relationship between the die body  11  and the die base  12 , and the opening/closing member  13  during cooling. In  FIG.  6   , the original position of the opening/closing member  13  is shown by a phantom line.  FIGS.  3  and  5    are cross-sectional views of the die  10 .  FIGS.  4  and  6    are diagrams to show the opening/closing member  13  when viewed from below, in which a part of the opening/closing member  13  is enlarged to be shown. 
     Referring to  FIG.  3   , in order to cool the formed article, refrigerant pressure feeding means provided outside the die  10  is driven, and refrigerant is supplied to the storage portion  122  to be stored. Examples of the refrigerant pressure feeding means include a pressure feed pump or cylinder disposed between the storage portion  122  and a refrigerant tank (not illustrated). The refrigerant pressure feeding means may be a water supply directly connected to the storage portion  122 . Further, refrigerant suction means such as a suction pump (not illustrated) connected to the discharge portion  123  of the die base  12  is driven. The refrigerant pressure feeding means and the refrigerant suction means are preferably driven before press working is started. As a result, before starting cooling of the formed article, the storage portion  122  is filled with refrigerant and is pressurized, and the discharge portion  123  becomes a negative pressure state. 
     As shown in  FIGS.  3  and  4   , before starting the cooling of the formed article, the through holes  131  of the opening/closing member  13  are deviated from the flow channels  113  of the die body  11 . The opening/closing member  13  is disposed such that each through hole  131  does not overlap the corresponding flow channel  113 . Therefore, a portion other than the through holes  131  of the opening/closing member  13  block the lower ends of the flow channels  113 . In other words, the storage portion  122  of the die base  12  and the flow channels  113  of the die body  11  are not in communication with each other. Moreover, the discharge portion  123  of the die base  12  and the flow channels  114  of the die body  11  are not in communication with each other. 
     In this state, the driving unit  133  is operated to cause the opening/closing member  13  to slide. In other words, as shown in  FIGS.  5  and  6   , the opening/closing member  13  is moved to one side in the sliding direction such that the through holes  131  of the opening/closing member  13  overlap the flow channels  113  of the die body  11 . Thereby, the storage portion  122  of the die base  12  and the flow channels  113  of the die body  11  are brought into communication with each other. At this time, the through holes  132  of the opening/closing member  13  also overlap the flow channels  114  of the die body  11 . Thereby, the discharge portion  123  and the through paths  126  of the die base  12  are brought into communication with the flow channels  114  of the die body  11 . 
     In the example shown in  FIGS.  4  and  6   , the distance in the sliding direction between each through hole  131  and the corresponding flow channel  113  is constant. Therefore, the plurality of through holes  131  begin to overlap the corresponding flow channels  113  at the same timing. Moreover, since the shapes and the areas of the plurality of through holes  131  are equal to each other, the time and the area at which each through hole  131  overlaps the flow channel  113  become equal. 
     When the flow channels  113  and the storage portion  122  are brought into communication, the refrigerant in the storage portion  122  flows into each flow channel  113  through the through hole  131 . The refrigerant flown into the flow channel  113  is ejected from the upper end  1132  of the flow channel  113  that opens at the top surface  11 Aa of the punch part  11 A or the upper surface  11 Ba of the flange part  11 B. The refrigerant flown into the flow channel  113  in the punch part  11 A may also be ejected from the front end  1133  of the branch flow channel  1131 . 
     The refrigerant ejected from the flow channels  113  and the branch flow channels  1131  of the die body  11  flows on the forming surface  111 . On the forming surface  111 , for example, a large number of fine convex portions are provided at approximately equal density, and the refrigerant flows between the convex portions. Thus, the refrigerant is supplied to the formed article and the formed article is cooled. 
     The refrigerant which has cooled the formed article flows into the flow channels  114  and the branch flow channels  1141  of the die body  11 , and flows down in each flow channel  114 . The refrigerant passes through each through hole  132  of the opening/closing member  13  and the through path  126  of the die base  12 , and reaches the discharge portion  123 , thereafter being discharged to the outside of the die  10 . 
     When stopping the supply of refrigerant to the formed article, the opening/closing member  13  is moved to the other side in the sliding direction. Thereby, the opening/closing member  13  is returned from a state in which the through holes  131  overlap the flow channels  113 , and the flow channels  113  and the storage portion  122  are in communication with each other ( FIGS.  5  and  6   ), to a state in which the through holes  131  have deviated from the flow channels  113 , and the flow channels  113  and the storage portion  122  are not in communication with each other ( FIGS.  3  and  4   ). Note that, while the opening/closing member  13  is moving, the refrigerant pressure feeding means for supplying refrigerant to the storage portion  122  and the refrigerant suction means for sucking the refrigerant from the discharge portion  123  remain being driven. By leaving the refrigerant pressure feeding means in a driving state and having the storage portion  122  wait in a state of being filled with refrigerant, the supply amount of the refrigerant to the flow channels  113  and the timing at which refrigerant is ejected from the flow channels  113  can be stabilized. 
     Advantageous Effects 
     In the die  10  according to the first embodiment, the storage portion  122  in which refrigerant is stored is formed at the surface  121  of the die base  12 . Therefore, it is not necessary to provide a cavity for storing refrigerant in the die body  11 . Therefore, the strength of the die  10  can be secured. 
     In the die  10  according to the first embodiment, the opening/closing member  13  having the plurality of through holes  131  formed is disposed between the die base  12  and the die body  11 . The through holes  131  of the opening/closing member  13  are arranged, for example, at the equal intervals as that of the flow channels  113  in the longitudinal direction and the lateral direction. By simply moving the opening/closing member  13 , it is possible to switch a communication state and a non-communication state between the flow channels  113  of the die body  11  and the storage portion  122  of the die base  12 . In a communication state, the refrigerant in the storage portion  122  flows into the flow channels  113  and is ejected from the forming surface  111 . Therefore, according to the die  10 , the refrigerant can be easily supplied from the die  10  to the formed article without performing complicated control by a plurality of valves. 
     In the first embodiment, the opening/closing member  13  has a plate shape, and slides in the lateral direction of the die  10 . The opening/closing member  13  slides in the horizontal direction with respect to the die body  11  outside the die body  11 . By sliding the opening/closing member  13 , all through holes  131  formed in the opening/closing member  13  can be moved, and the plurality of flow channels  113  corresponding to the through holes  131  and the storage portion  122  can be brought into communication. Therefore, refrigerant can be ejected uniformly from the plurality of flow channels  113 . 
     In the first embodiment, in the opening/closing member  13 , each of the plurality of through holes  131  has a circular shape. However, in the first embodiment, the plurality of through holes  131  may include through holes having different shapes from each other. 
     For example, as shown in  FIG.  7   , the plurality of through holes  131  may include a circular through hole  131 C and an elliptic through hole  131 D having a major diameter in the sliding direction. In the sliding direction, the width (opening length) Wd of the through hole  131 D is larger than the width (opening length) We of the through hole  131 C. 
     Referring to  FIG.  7   , in the initial state, both the through holes  131 C and  131 D do not overlap the corresponding flow channels  113 C and  113 D, and are in non-communication state. In the sliding direction, the positions of the ends of the through holes  131 C and the through holes  131 D, which are farther from the flow channels  113 C and  113 D, correspond to each other. When the opening/closing member  13  is slid from this state to one side in the sliding direction, as shown in  FIG.  8   , the elliptic through hole  131 D first overlaps the flow channel  113 D, resulting in a communication state. On the other hand, at this time, the circular through hole  131 C does not overlap the flow channel  113 C. When the opening/closing member  13  is further slid, as shown in  FIG.  9   , the through hole  131 C also overlaps the flow channel  113 C, resulting in a communication state. 
     When returning the through holes  131 C and  131 D to a non-communication state, the opening/closing member  13  is slid to the other side in the sliding direction. When the opening/closing member  13  is slid to the other side in the sliding direction, the through hole  131 C first deviates from the flow channel  113 C, resulting in a non-communication state ( FIG.  8   ), and then the through hole  131 D deviates from the flow channel  113 D, resulting in a non-communication state ( FIG.  7   ). 
     Thus, since the width Wd in the sliding direction of the through hole  131 D is larger than the width We in the sliding direction of the through hole  131 C, the time for which the through hole  131 D is overlapping the flow channel  113 D is longer than the time for which the through hole  131 C is overlapping the flow channel  113 C. Therefore, the flow channel  113 D has a longer communication time with the storage portion  122  ( FIG.  5   ) than the flow channel  113 C. Therefore, it is possible to increase the supply time of refrigerant from the flow channel  113 D to the formed article. 
     For example, as shown in  FIG.  10   , in a direction perpendicular to the sliding direction, the width (opening length) We of the through hole  131 E may be larger than the width (opening length) Wf of the through hole  131 F. For example, the through hole  131 E may have a circular shape, and the through hole  131 F may have a semicircular shape. 
     Referring to  FIG.  10   , in the initial state, both the through holes  131 E and  131 F do not overlap the corresponding flow channels  113 E and  113 F, and are in a non-communication state. The positions in the sliding direction of the through hole  131 E and the through hole  131 F coincide with each other. When the opening/closing member  13  is slid from this state to one side in the sliding direction, as shown in  FIG.  11   , the through holes  131 E and  131 F simultaneously overlap the flow channels  113 E and  113 F, resulting in a communication state. When the opening/closing member  13  is moved to the other side in the sliding direction, the through holes  131 E and  131 F simultaneously deviate from the flow channels  113 E and  113 F, resulting in a non-communication state ( FIG.  10   ). However, the area in which the through hole  131 E and the flow channel  113 E overlap is larger than the area in which the through hole  131 F and the flow channel  113 F overlap. Therefore, the flow rate per unit time of the refrigerant supplied from the flow channel  113 E to the formed article can be increased to more than the flow rate per unit time of the refrigerant supplied from the flow channel  113 F to the formed article. 
     Moreover, for example, as shown in  FIG.  12   , in the sliding direction, the width (opening length) Wh 1  of the through hole  131 H may be larger than the width (opening length) Wg 1  of the through hole  131 G. In the direction perpendicular to the sliding direction, the width (opening length) Wg 2  of the through hole  131 G may be larger than the width (opening length) Wh 2  of the through hole  131 H. For example, the through hole  131 G may have a circular shape, and the through hole  131 H may have a semi-elliptic shape. 
     Referring to  FIG.  12   , in the initial state, both of the through holes  131 G and  131 H do not overlap the corresponding flow channels  113 G and  113 H, and are in a non-communication state. In the sliding direction, the positions of the ends of the through hole  131 G and the through hole  131 H, which are farther from the flow channels  113 G and  113 H, coincide with each other. When the opening/closing member  13  is slid from this state to one side in the sliding direction, the through hole  131 H first overlaps the flow channel  113 H as shown in  FIG.  13   . On the other hand, at this time, the through hole  131 G does not overlap the flow channel  113 G. When the opening/closing member  13  is further slid, as shown in  FIG.  14   , the through hole  131 G also overlaps the flow channel  113 G. When the opening/closing member  13  is slid to the other side in the sliding direction, the through hole  131 G first deviates from the flow channel  113 G, resulting in a non-communication state ( FIG.  13   ), and then the through hole  131 H deviates from the flow channel  113 H, resulting in a non-communication state ( FIG.  12   ). 
     Since the width Wh 1  in the sliding direction of the through hole  131 H is larger than the width Wg 1  in the sliding direction of the through hole  131 G, the flow channel  113 H has a longer communication time with the storage portion  122  ( FIG.  5   ) than the flow channel  113 G. Therefore, it is possible to increase the supply time of refrigerant from the flow channel  113 H to the formed article. On the other hand, the area where the through hole  131 G and the flow channel  113 G overlap is larger than the area where the through hole  131 H and the flow channel  113 H overlap. Therefore, the flow rate per unit time of the refrigerant supplied from the flow channel  113 G to the formed article can be increased to more than the flow rate per unit time of the refrigerant supplied from the flow channel  113 H to the formed article. 
     Thus, at each through hole  131  of the opening/closing member  13 , by changing the width in the sliding direction, it is possible to adjust the supply time of refrigerant to the formed article for each through hole  131 . At each through hole  131 , by changing the width in the direction perpendicular to the sliding direction, it is possible to adjust the flow rate per unit time of the refrigerant supplied to the formed article for each through hole  131 . Therefore, the cooling time, cooling speed, and the like can be appropriately set for each part of the formed article. 
     For example, when it is desired that, in the formed article, the portion to be formed by a side surface  11 Ab of the punch part  11 A is cooled more harshly than other portions, the width of the through hole  131  corresponding to the flow channel  113  which opens at the side surface  11 Ab may be made larger than the width of other through holes  131  in the sliding direction and/or the direction perpendicular to the sliding direction. When it is desired that, in the formed article, the portion to be formed by a flange part  11 B is cooled more weakly than the other portions, the width of the through hole  131  corresponding to the flow channel  113  of the flange part  11 B may be made smaller than the width of other through holes  131  in the sliding direction and/or the direction perpendicular to the sliding direction. 
       FIGS.  7  to  14    show, for the sake of convenience of explanation, two types of through holes  131  having different widths in the sliding direction and/or the direction perpendicular to the sliding direction. However, the opening/closing member  13  may also be provided with three or more types of through holes  131  having different widths in the sliding direction and/or the direction perpendicular to the sliding direction. By efficiently providing a plurality of types of through holes  131  in the opening/closing member  13 , it is possible to efficiently perform ejection control of the refrigerant from the plurality of flow channels  113 . 
     In the example shown in  FIGS.  7  to  14   , the opening/closing member  13  is moved to one side in the sliding direction so that the through holes  131  are overlapped with the flow channels  113  into a communication state, and thereafter the opening/closing member  13  is moved to the other side in the sliding direction to return it to the initial position so that the through holes  131  are brought into a non-communication state. However, the through holes  131  may be brought into a non-communication state by, after moving the opening/closing member  13  to one side in the sliding direction so that the through holes  131  are overlapped with the flow channels  113  thereby being brought into a communication state, keeping on the through holes  131  to move passing the flow channels  113 . Next, when bringing the through holes  131  into a communication state, the opening/closing member  13  may be moved to the other side in the sliding direction. In other words, by moving the opening/closing member  13  to the other side in the sliding direction, the through holes  131  in a non-communication state are made to overlap the flow channels  113 , thus being brought into a communication state. Thereafter, by moving the opening/closing member  13  further to the other side in the sliding direction and returning it to the initial position, the through holes  131  pass the flow channels  113  and are brought into a non-communication state. When returning the opening/closing member  13  to the initial position, in order to suppress the ejection of the refrigerant from the die, supply of refrigerant may be stopped by stopping a refrigerant supply unit (refrigerant pressure feeding means), closing the valve provided in the refrigerant supply portion of the refrigerant supply unit, or the like. 
     In the first embodiment, the storage portion  122  of the die base  12  is configured by the plurality of grooves  124 ,  125  provided at the surface  121 . In the storage portion  122 , one or more island-like portions surrounded by the grooves  124 ,  125 , in other words, one or more portions that protrude from the bottom surface of the concave storage portion  122  to come into contact with the opening/closing member  13  are formed. For that reason, for example, the storage amount of refrigerant in the storage portion  122  can be reduced compared with the case in which the storage portion  122  is a single concave portion without the island-like portion. Therefore, when supply of refrigerant to the storage portion  122  is started without the storage portion  122  being filled with refrigerant, it is possible to reduce the time from when the supply of the refrigerant to the storage portion  122  is started until when the refrigerant is allowed to flow into each flow channel  113  of the die body  11 . On the other hand, when the supply of the refrigerant to the storage portion  122  is started with the storage portion  122  being already filled with the refrigerant, good responsiveness of the refrigerant pressure (the performance that the refrigerant in the storage portion  122  flows into each flow channel  113  in response to the start of supply of refrigerant to the storage portion  122 ) can be ensured. In other words, in the case of a storage portion  122  having an island-like portion surrounded by the grooves  124 ,  125 , even if the supply flow rate of refrigerant does not change, the responsiveness of refrigerant pressure can be improved compared to the storage portion  122  without an island-like portion. In addition to this, even when the surface position (water level) of the refrigerant in the storage portion  122  has been lowered before the refrigerant is supplied, the time fluctuation until the refrigerant can flow into each flow channel  113  of the die body  11  can be suppressed. 
     Further, by configuring the storage portions  122  by bringing the plurality of grooves  124 ,  125  into communication with each other, it is possible to integrate piping systems to be connected to the die base  12 , and expand the diameter of the pipe connected to the die base  12 . Therefore, it is possible to suppress the pressure loss of the refrigerant to be supplied to the storage portion  122 . Furthermore, it is possible to compensate the decrease in the flow rate of refrigerant in the communication portion between each flow channel  113  of the die body  11  and the storage portion  122 , and stabilize the flow rate of refrigerant ejected from the forming surface  111  through the flow channels  113 . Similarly, if the discharge portion  123  is configured by a plurality of grooves in communication with each other, it is possible to integrate piping systems on the discharge side and expand the diameter of the pipe connected to the die base  12 , thereby allowing to suppress the pressure loss of the refrigerant ejected from the discharge portion  123 . Moreover, it is possible to compensate decrease in the flow rate of refrigerant in the communication portion between each flow channel  114  of the die body  11  and the discharge portion  123 , and stabilize the flow rate of refrigerant discharged from the discharge portion  123  through the flow channels  114 . 
     In the first embodiment, the grooves  124 ,  125  of the die base  12  are provided so as to be in communication with each other and correspond to the plurality of through holes  131  of the opening/closing member  13 . This makes it possible to uniformize the pressure distribution of the refrigerant flowing from the grooves  124 ,  125  into the flow channels  113  of the die body  11  through the through holes  131 . 
     In the first embodiment, since the refrigerant storage portion  122  is formed in the die base  12 , it is not necessary to make a cavity in the die body  11  which is dependent on the shape of the formed article, and also it is not necessary to prepare a container for the refrigerant according to the shape of the cavity. Therefore, the production of the die body  11  becomes easy. Further, providing the refrigerant storage portion  122  in the die base  12  makes it possible to share the die base  12  with a plurality of types of die bodies  11 . 
     For example, if the pitch of the flow channels  113  in the lateral direction of the die body  11  is set to an integer multiple of the pitch of the grooves  124  of the die base  12 , no matter which die body  11  is mounted to the die base  12 , each flow channel  113  faces the groove  124 . Therefore, one die base  12  can be shared by a plurality of types of die bodies  11 . 
     In the first embodiment, ejection control of refrigerant is performed by the opening/closing member  13  disposed between the die body  11  and the die base  12 . Since the opening/closing member  13  is separate from the die body  11  and the die base  12 , it is possible to replace it appropriately. In other words, it is also possible to exchange the opening/closing member  13  of the die  10  with another opening/closing member  13  in which the through holes  131  are located differently. Thereby, the flow channels  113  of the die body  11  can be selectively used. 
     In the first embodiment, an example in which the die  10  includes one opening/closing member  13  has been described, but the number of the opening/closing members  13  is not particularly limited. The die  10  can also include a plurality of opening/closing members  13  as necessary. For example, in the die  10 , a plurality of opening/closing members  13  may be placed in parallel on the surface  121  of the die base  12 . These opening/closing members  13  slide, for example, in the same direction on the surface  121  of the die base  12 . 
     Second Embodiment 
       FIG.  15    is a sectional view (cross section view) in a plane perpendicular to the longitudinal direction of the die  10 A according to a second embodiment. The die  10 A according to the second embodiment differs from the die  10  according to the first embodiment in the configuration of the opening/closing member. In  FIG.  15   , only the flow channels  113  on the refrigerant supply side are shown, and the flow channels  114  on the refrigerant discharge side are omitted. 
     As shown in  FIG.  15   , the die  10 A includes a plurality of opening/closing members  13 A and  13 B. Each of the opening/closing members  13 A and  13 B has a solid plate shape. The opening/closing members  13 A and  13 B are members separate from the die body  11  and are disposed outside the die body  11 . More specifically, the opening/closing members  13 A and  13 B are disposed between the die base  12  and the die body  11 . The opening/closing member  13 A is placed on the opening/closing member  13 B. The opening/closing members  13 A and  13 B are provided with driving units  133 A and  133 B, respectively. The opening/closing members  13 A and  13 B slide independently in the lateral direction of the die  10 A. The opening/closing member  13 A includes a plurality of through holes  131   a.  The opening/closing member  13 B includes a plurality of through holes  131   b.  Referring to  FIGS.  16  to  19   , the operation of the opening/closing members  13 A and  13 B will be described. 
     As shown in  FIG.  16   , before cooling the formed article, the through holes  131   b  of the opening/closing member  13 B overlap the flow channels  113 . On the other hand, since the through holes  131   a  of the opening/closing member  13 A do not overlap the flow channels  113 , the flow channels  113  are blocked by the opening/closing member  13 A. From this state, when the driving unit  133 A is driven and the opening/closing member  13 A is slid to one side in the sliding direction, the through holes  131   a  overlap the flow channels  113  as shown in  FIG.  17   . Therefore, the flow channels  113  and the storage portion  122  ( FIG.  15   ) are brought into a communication state, and the refrigerant in the storage portion  122  is ejected from the upper end of each flow channel  113 . When the opening/closing member  13 A is further slid, as shown in  FIG.  18   , the through holes  131   a  pass the flow channels  113 , and the flow channels  113  are blocked by the opening/closing member  13 A. This ends the supply of refrigerant to the formed article. 
     When returning the opening/closing member  13 A to the initial position and entering the preparation for press working of a new blank, the opening/closing member  13 B is slid to the other side in the sliding direction by driving the driving unit  133 B while the opening/closing member  13 A is stopped. As a result, as shown in  FIG.  19   , the through holes  131   b  of the opening/closing member  13 B become not overlapping the flow channels  113 . Thereafter, the opening/closing member  13 A is slid to the other side and is returned to the initial position. At this time, since the opening/closing member  13 A follows the same path to return to the original position, the through holes  131   a  of the opening/closing member  13 A overlap the flow channels  113 . However, since the flow channels  113  are blocked by the opening/closing member  13 B, the flow channels  113  and the storage portion  122  ( FIG.  15   ) remain in a non-communication state. After the opening/closing member  13 A returns to the original position, the opening/closing member  13 B is returned to the original position. At this time, since the flow channels  113  are blocked by the opening/closing member  13 A, the flow channels  113  and the storage portion  122  remain in a non-communication state. 
     Thus, by using the two opening/closing members  13 A and  13 B, it is possible to return the opening/closing members  13 A and  13 B to the initial positions while the flow channel  113  and the storage portion  122  are maintained in a non-communication state, after the supply of refrigerant to the formed article is completed. In other words, it is possible to return the opening/closing members  13 A and  13 B to the initial positions without the refrigerant being ejected from the flow channels  113  even if any countermeasure such as stopping the refrigerant pressure feeding means is not taken. Therefore, for example, even when the timing of starting the ejection of refrigerant from the flow channel  113  is different among the plurality of through holes  131   a,  the timing of stopping the ejection of refrigerant can be made to coincide among these through holes  131   a.  In other words, by using the two opening/closing members  13 A and  13 B, it is possible to independently control the timing of starting the ejection of refrigerant and the timing of stopping the ejection of refrigerant. 
     The opening/closing member  13  can also be slidable in two axial directions. For example, as shown in  FIGS.  20  to  23   , the opening/closing member  13  may be configured to slide in a first sliding direction, and in a second sliding direction different from the first sliding direction. Here, description will be made on a case in which the second sliding direction is perpendicular to the first sliding direction. In this case, when cooling the formed article, the opening/closing member  13  is moved to one side in the first sliding direction ( FIG.  20   ) so as to cause the through holes  131  to overlap the flow channels  113  ( FIG.  21   ). When the opening/closing member  13  is further slid, the through holes  131  pass the flow channels  113 , and the flow channels  113  are blocked by the opening/closing member  13  ( FIG.  22   ). As a result of this, the supply of refrigerant to the formed article will end. 
     The moving path of the opening/closing member  13  when the opening/closing member  13  is returned to the initial position after the supply of refrigerant is ended is different from the moving path ( FIGS.  21  and  22   ) of the opening/closing member  13  when the supply of refrigerant is performed. When returning the opening/closing member  13  to the initial position, the opening/closing member  13  is moved to one side in the second sliding direction ( FIG.  23   ), and is thereafter moved to the other side in the first sliding direction. At this time, the through holes  131  of the opening/closing member  13  do not overlap the flow channels  113 . Finally, by moving the opening/closing member  13  to the other side in the second sliding direction, the opening/closing member  13  is returned to the position of  FIG.  20   . 
     Thus, even when one opening/closing member  13  is made slidable in two axial directions, it is possible to return the opening/closing member  13  to the initial position while the flow channels  113  and the storage portion  122  are maintained in a non-communication state, after the supply of refrigerant to the formed article is ended. In other words, even without taking any countermeasure such as stopping the refrigerant pressure feeding means, it is possible to return the opening/closing member  13  to the initial position without the refrigerant being ejected from the flow channels  113 . Therefore, for example, even when the timing of starting the ejection of refrigerant from the flow channel  113  is different among the plurality of through holes  131 , the timing of stopping the ejection of the refrigerant can be made to coincide among these through holes  131 . In other words, by sliding the opening/closing member  13  in two axial directions, it is possible to independently control the timing of starting the ejection of refrigerant and the timing of stopping the ejection of refrigerant. 
     Although embodiments according to the present disclosure have been described so far, the present disclosure will not be limited to the above described embodiments, and various modifications can be made as long as they do not depart from the spirit thereof. 
     In the above described first embodiment, the opening/closing member  13  has a plate shape. However, the opening/closing member  13  may not have a plate shape. For example, as shown in  FIG.  24   , the opening/closing member  13 C may include, in addition to a plurality of through holes  134 , rotating shafts  135  and cylindrical members  136  that each rotate integrally with the corresponding rotating shaft  135 . Both ends of the rotating shafts  135  are rotatably mounted to a support member  137 . Each through hole  134  passes through the corresponding cylindrical member  136  and rotating shaft  135  in the vertical direction. 
     The cylindrical member  136  and the rotating shaft  135  extend in the longitudinal direction between the die base  12 A and the die body  11 C. The outer peripheral surface of the cylindrical member  136  is in contact with a concave portion formed at the mounting surface  11 C 1  of the die body  11 C and a concave portion formed at the surface  12 A 1  of the die base  12 A. The flow channel  11 C 2  opens in the concave portion of the mounting surface  11 C 1 . A supply tube  12 A 3  extending upward from the storage portion  12 A 2  opens in the concave portion of the surface  12 A 1  of the die base  12 A. 
     When the through hole  134  of the opening/closing member  13 C extends in the vertical direction, the upper end of the through hole  134  overlaps the flow channel  11 C 2  of the die body  11 C, and the lower end of the through hole  134  overlaps the supply tube  12 A 3  extending from the storage portion  12 A 2  of the die base  12 A. Therefore, the flow channel  11 C 2  and the storage portion  12 A 2  are brought into a communication state. From this state, when the rotating shaft  135  and the cylindrical member  136  are rotated by the driving unit (not illustrated), the through hole  134  deviates from the flow channel  11 C 2  and the supply tube  12 A 3 , and the flow channel  11 C 2  and the storage portion  12 A 2  are brought into a non-communication state. Therefore, even in such a configuration, the flow channel  11 C 2  and the storage portion  12 A 2  can be switched to a communication state or a non-communication state. 
     In each of the above described embodiments, the flow channels  113  of the die body  11  and the storage portion  122  of the die base  12  are brought into communication by sliding the plate-shaped opening/closing member  13  in one or two axial directions. However, the flow channels  113  and the storage portion  122  may be brought into communication by rotating the plate-shaped opening/closing member  13  with the vertical direction as the center axis. 
     In each of the above described embodiments, the opening/closing member  13  is placed at the middle part in the longitudinal direction of the die base  12 , and the die body  11  is supported only by both ends in the longitudinal direction of the die base  12 . However, the die body  11  can also be supported by both ends in the longitudinal direction of the die base  12  and the intermediate portion thereof. In other words, one or more intermediate supporting portions for supporting the die body  11  can be provided between ends in the longitudinal direction of the die base  12 . When an intermediate supporting portion is provided in the die base  12 , for example, the opening/closing member  13  can be divided into a plurality of pieces at the position of the intermediate supporting portion. Alternatively, an opening portion can be provided in the portion corresponding to the intermediate supporting portion of the opening/closing members  13 . To allow sliding of the opening/closing member  13 , the length of the opening portion in the sliding direction is sufficiently larger than the length of the intermediate supporting portion. 
     In each of the above described embodiments, the storage portion  122  includes the plurality of grooves  124  extending in a direction perpendicular to the sliding direction of the opening/closing member  13 . However, the grooves  124  may not necessarily extend in the direction perpendicular to the sliding direction. The grooves  124  may extend in the sliding direction or may be inclined with respect to the sliding direction. 
     In each of the above described embodiments, the storage portion  122  is configured by the grooves  124  and  125  which are in communication with each other. However, the storage portion  122  may not be configured by the grooves  124  and  125 . For example, the storage portion  122  may simply be a concave space. 
     In each of the above described embodiments, the flow channels  113  of the die body  11  are used as supply flow channels of refrigerant, and the flow channels  114  are used as discharge flow channels of refrigerant. However, conversely, the flow channels  114  of the die body  11  can be used as supply flow channels of refrigerant and the flow channels  113  as discharge flow channels of refrigerant. In this case, the storage portion  122  of the die base  12  functions as a discharge portion, and the discharge portion  123  functions as a storage portion. 
     In each of the above described embodiments, the storage portion  122  is provided at the surface  121  on the die body  11  side in the die base  12 , and the discharge portion  123  is provided at the surface on the opposite side. However, both the storage portion  122  and the discharge portion  123  can be formed at the surface  121  on the die body  11  side. For example, on the surface  121  of the die base  12 , the grooves (lateral grooves) constituting the storage portion  122  and the grooves (lateral grooves) constituting the discharge portion  123  can be alternately arranged. It is preferable that the lateral grooves of the storage portion  122 , as well as the lateral grooves of the discharge portion  123  are in communication with each other through a groove (longitudinal groove) extending in the arrangement direction, respectively. In each of the storage portions  122  and the discharge portion  123 , the longitudinal grooves may connect the ends of the lateral grooves arranged in one direction, or may connect middle parts of each lateral groove. For example, when the longitudinal grooves connect the middle parts of each lateral groove at the discharge portion  123 , each lateral groove of the storage portion  122  is divided by the longitudinal groove of the discharge portion  123 . 
     In each of the above described embodiments, the die body  11  has an approximately hat shape viewed from the longitudinal direction. However, the die body  11  is not limited thereto. The die body  11  may have a shape corresponding to various formed articles produced by hot pressing. 
     In each of the above described embodiments, refrigerant is supplied from the die  10 ,  10 A which is the lower die. However, the refrigerant may be supplied not only from the die  10 ,  10 A but also from the die  20  ( FIG.  1   ), which is the upper die. In this case, the die  20  preferably has a configuration similar to that of the die  10 ,  10 A. 
     That is, as shown in  FIG.  25   , the die  20  preferably has a configuration in which the opening/closing member  13  is disposed between the die body  21  and the die base  22 . In the die body  21 , as in the die body  11  of the die  10  ( FIG.  3   ), flow channels  113 ,  114 , and branch flow channels  1131 ,  1141  are provided. In the die base  22 , as in the die base  12  of the die  10  ( FIG.  3   ), a storage portion  122 , and a discharge portion  123  are provided. The opening/closing member  13  is configured to be movable with respect to the die body  21  and the die base  22  such that each of through holes  131  brings the corresponding flow channel  113  of the die body  21  and the storage portion  122  of the die base  22  into communication. Further, each through hole  132  brings the corresponding flow channel  114  of the die body  21  and the discharge portion  123  of the die base  22  into communication. As a result of the storage portion  122  and the flow channels  113  being brought into communication, the refrigerant in the storage portion  122  is ejected from the forming surface  211  of the die body  21  through the flow channels  113 . The refrigerant on the forming surface  211  is discharged from the die  20  through the flow channels  114  and the discharge portion  123 . 
     REFERENCE SIGNS LIST 
     
         
           10 ,  10 A,  20 : Die 
           11 ,  11 C,  21 : Die body 
           111 ,  211 : Forming surface 
           112 ,  11 C 1 : Mounting surface 
           113 ,  113 C to  113 H,  11 C 2 : Flow channel 
           12 ,  12 A,  22 : Die base 
           121 ,  12 A 1 : Surface 
           122 ,  12 A 2 : Storage portion 
           124 ,  125 : Groove 
           13 ,  13 A to  13 C: Opening/closing member 
           131 ,  131 C to  131 H,  131   a,    131   b,    134 : Through hole