Patent Publication Number: US-6698496-B2

Title: Cooling arrangement for die-casting metal mold

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a 371 of PCT/JP01/05611 filed on Jun. 29, 2001. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a cooling arrangement for a die-casting metal mold, and more particularly, to such a cooling arrangement capable of uniformly cooling the entirety of the die-casting metal mold. 
     BACKGROUND ART 
     A conventional cooling arrangement for a die-casting metal mold is described in Laid-open Japanese Patent application Publication No. Sho-58-211405. In the disclosed arrangement, a coolant passage is penetratingly formed in the metal mold. The passage has one open end connected to a coolant accumulation tank through a coolant inlet pipe, and has another open end connected to the tank through a coolant outlet pipe. A pump is provided at the coolant outlet pipe. Upon actuation of the pump, the coolant in the tank is introduced into the coolant passage in the metal mold through the coolant inlet pipe, and is then circulated to the tank through the coolant outlet pipe. A temperature of the coolant in the tank is controlled by a tank temperature controller for supplying the coolant at its optimum temperature to the die-casting metal mold. 
     Laid-open Japanese Patent Application Publication No. Hei-6-71408 discloses a method for forming a coolant passage in a die-casting metal mold. According to the disclosed method, a continuous deep groove is formed by a cut machining at a surface opposite to a mold cavity, and a lid is covered over the formed groove to provide a coolant passage. This method is designed to overcome the deficiency in a conventional drilling where a desirable configuration and orientation of the passage cannot be provided. 
     Further, still another conventional cooling arrangement is shown in FIG. 7 in which a linear cooing bore  130  is bored from a surface opposite to a mold cavity  125  to a position adjacent to the mold cavity  125 , and a coolant supply pipe  105  extends through and generally concentrically with the cooling bore  130 . A coolant is supplied through the coolant supply pipe  105  in a direction indicated by an arrow in FIG.  7 . The supplied coolant passes through a space defined between an inner peripheral surface of the cooling bore  130  and an outer peripheral surface of the coolant supply pipe  105 , and is then discharged through a coolant discharge pipe  107 . Thus, the metal mold can be locally cooled by a linear coolant passage extending in a depthwise direction (thickness direction) of the metal mold. 
     However, in these conventional cooling arrangements, water is generally employed as the coolant. In such a case, clogging of the coolant passage may occur due to deposition of fur on the coolant passage or cooling efficiency may be excessively lowered due to boiling of the water, if the coolant passage is located adjacent to the mold cavity. In view of this reason, the coolant passage must be positioned away from the mold cavity by a predetermined distance. 
     Further, if a cross-sectional area of the coolant passage is insufficiently small, it would be impossible to cool a wide range of the mold cavity simultaneously, and therefore, it would be difficult to uniformly cool the entirety of the mold cavity. 
     Furthermore, in a conventional cooling arrangement, only one coolant passage is formed in the mold cavity. In this connection, a coolant adjacent to the coolant inlet has a low temperature, whereas a coolant adjacent to the coolant outlet has a high temperature, which cannot uniformly cool the entirety of the mold cavity at an even temperature. Moreover, a region of the mold cavity and ambient region thereof cannot be uniformly cooled with the only one coolant passage. That is, it would be difficult to uniformly distribute the passage along the mold cavity due to a three dimensional construction of the mold cavity. 
     Therefore, it is an object of the present invention to provide a cooling arrangement capable of uniformly cooling an entire region of the die-casting metal mold. 
     DISCLOSURE OF INVENTION 
     In order to attain the object, the present invention provides a cooling arrangement  1  for cooling a die-casting metal mold  2  having a stationary die  24  and a movable die  22  defining a mold cavity  25  in combination with the stationary die  24 , the cooling arrangement including coolant passage means formed in an interior of the die-casting metal mold  2  for allowing a coolant to pass therethrough for cooling the die-casting metal mold  2 , the improvement wherein the coolant is made from an oil, and the coolant passage means comprises a plurality of coolant passages A,B,C,D,E,F,G formed at least in the movable die  22 , and each of the coolant passages A,B,C,D,E,F,G is defined by a deep and wide groove  30 , 32 , 34 , 36 , 38  and a partitioning plate  31 , 33 , 35 , 37 , 39  disposed in the groove  30 , 32 , 34 , 36 , 38 , each groove  30 , 32 , 34 ,  36 , 38  and each partitioning plate  31 , 33 , 35 , 37 , 39  having shapes in conformance with a shape of the mold cavity  25  and being positioned adjacent thereto, and a temperature controller  9 , 10  with a cooling device  11 , 12  is connected to each coolant passage A,B,C,D,E,F,G, and the plurality of coolant passages A,B,C,D,E are grouped into a plurality of groups (A,B,C,D) and (E,F,G), and necessary numbers of the temperature controllers  9 , 10  are provided in accordance with the numbers of the groups to provide, for each group, a coolant circulation circuit  3 , 4  including a coolant supply circuit  5 , 6  and a coolant discharge circuit  7 , 8  with the associated temperature controller  9 , 10 , whereby cooling control is performed independent of each group (A,B,C,D) and (E,F,G). 
     With the cooling arrangement for cooling the die-casting metal mold, clogging of the coolant passage with the fur can be prevented, and excessive lowering of the cooling performance due to boiling of the coolant can be avoided, since oil is used as the coolant. Further, an entire die-casting product can be uniformly cooled, since the coolant passage can be positioned close to the mold cavity and since the mold cavity surface can be uniformly cooled by supplying the coolant in an extensive region. As a result, shot cycle can be remarkably shortened. Further, difference in a temperature at or around the coolant supply circuit and a temperature at or around the coolant discharge circuit can be severely taken into consideration for attaining more uniform cooling to the mold product because of the formation of the plurality of coolant passages. 
     Further, the plurality of the coolant passages are grouped into a plurality of groups, and the temperature controllers are provided in correspondence to the groups, and the coolant circulation circuit constituted by the coolant supply circuit and the coolant discharge circuit is provided in association with the temperature controller for controlling cooling independent of each group. Therefore, a desired portion of the metal mold can be cooled, and control to the temperature of the coolant and control to the supply of the coolant can be performed independently of each group. Consequently, more precise cooling control can be achieved. 
     In another aspect of the invention, there is provided a cooling arrangement  1  for cooling a die-casting metal mold  2  having a stationary die  24  and a movable die  22  defining a mold cavity  25  in combination with the stationary die  24 , the cooling arrangement including coolant passage means formed in an interior of the die-casting metal mold  2  for allowing a coolant to pass therethrough for cooling the die-casing metal mold  2 , the improvement wherein the coolant is made from an oil, and the coolant passage means comprises a plurality of coolant passages A,B,C,D,E,F,G formed at least in the movable die  22 , and each of the coolant passages A,B,C,D,E,F,G is defined by a deep and wide groove  30 , 32 , 34 , 36 , 38  and a partitioning plate  31 , 33 , 35 , 37 , 39  disposed in the groove  30 , 32 , 34 , 36 , 38 , each groove  30 , 32 , 34 ,  36 , 38  and each partitioning plate  31 , 33 , 35 , 37 , 39  having shapes in conformance with a shape of the mold cavity  25  and being positioned adjacent thereto, the partitioning plate  31 , 33 , 35   37 , 39  having an outer surface formed with at least one auxiliary path  31   e , 31   f , 31   g , 33   e , 33   f  at a position adjacent to the mold cavity  25  to provide a branch flow of the coolant in each coolant passage A,B,C,D,E,F,G, and a temperature controller  9 , 10  with a cooling device  11 , 12  is connected to each coolant passage A,B,C,D,E,F,G. 
     With the cooling arrangement for cooling the die-casting metal mold, clogging of the coolant passage with the fur can be prevented, and excessive lowering of the cooling performance due to boiling of the coolant can be avoided, since oil is used as the coolant. Further, an entire die-casting product can be uniformly cooled, since the coolant passage can be positioned close to the mold cavity and since the mold cavity surface can be uniformly cooled by supplying the coolant in an extensive region. As a result, shot cycle can be remarkably shortened. Further, difference in a temperature at or around the coolant supply circuit and a temperature at or around the coolant discharge circuit can be severely taken into consideration for attaining more uniform cooling to the mold product because of the formation of the plurality of coolant passages. 
     Further, the cooling oil can be distributed to wider area by the formation of the auxiliary path to further promote uniform cooling. The auxiliary path can be easily provided by forming a groove at the outer surface of the partitioning plate. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     In the drawings: 
     FIG. 1 is a schematic view showing a cooling arrangement for cooling a die-casting metal mold according to one embodiment of the present invention; 
     FIG. 2 is a front view showing a movable die provided with the cooling arrangement according to the embodiment of the present invention; 
     FIG. 3 is a cross-sectional view taken along the line III—III of FIG. 2; 
     FIG. 4 is a cross-sectional view taken along the line IV—IV of FIG. 1; 
     FIG. 5 is a cross-sectional view taken along the line V—V of FIG. 2; 
     FIG. 6 is a cross-sectional view taken along the line VI—VI of FIG. 2; and 
     FIG. 7 is a cross-sectional view showing a conventional cooling arrangement for cooling a die-casting metal mold. 
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     A cooling arrangement for cooling a die-casting metal mold according to one embodiment of the present invention will be described with reference to FIGS. 1 through 6. FIG. 1 is a schematic view showing the cooling arrangement according to the embodiment. 
     A die-casting metal mold  2  includes a movable die  22  fixed to a movable holder  21 , and a stationary die  24  fixed to a stationary holder  23 . A mold cavity  25  is defined at confronting surfaces of the movable die  22  and the stationary die  24 . As shown in FIG. 2, ejection pins  26   a ,  26   b ,  26   c ,  26   d ,  26   e ,  26   f ,  26   g ,  26   h ,  26   i  are provided at the movable die  22  for ejecting a mold product from the metal mold  2 . As described later, a set of a plurality of coolant passages A, B, C, D are formed in the movable die  22 , and another set of a plurality of coolant passages E, F, G are formed in the stationary die  24 . To these coolant passages A through G, oil is introduced as a coolant for cooling the metal mold  2 . Electric spark machining oil, quenching oil, and temperature control oil are preferable as cooling oil. 
     The coolant passages A, B, C, D at the movable die  22  have inlet side passages a 1 , b 1 , c 1 , d 1  and outlet side passages a 2 , b 2 , c 2 , d 2 . The inlet side passages a 1 , b 1 , c 1 , d 1  are connected to an inlet side manifold  5 B formed with a plurality of inlet holes. The inlet side manifold  5 B is connected to a temperature controller  9  through a supply pipe  5 A. The supply pipe  5 A and the inlet side manifold  5 B constitute a coolant supply circuit  5 . The outlet side passages a 2 , b 2 , c 2 , d 2  are connected to a discharge side manifold  7 B formed with a plurality of discharge holes. The discharge side manifold  7 B is connected to the temperature controller  9  through a discharge pipe  7 A. The discharge manifold  7 B and the discharge pipe  7 A constitute a coolant discharge circuit  7 . The coolant supply circuit  5  and the coolant discharge circuit  7  constitute a coolant circulation circuit  3 . 
     The temperature controller  9  is provided with ON/OFF switch  9   a  for turning ON and OFF an electric power, a temperature control dial  9   b  for setting a temperature of the cooling oil, and a temperature display  9   c  for displaying a temperature of the cooling oil. Further, a cooling device  11  is connected to the temperature controller  9 . The cooling device  10  includes a cooling water supply tube  11   a , a cooling water discharge tube  11   b , and a stop valve  11   c  disposed at the cooling water supply tube  11   a . In the cooling device  10 , the cooling water is supplied to the temperature controller  9  through the cooling water supply tube  11   a  for cooling the cooling oil accumulated in an oil tank (not shown) disposed interior of the temperature controller  9 . Then, the cooling water is discharged outside through the discharge tube  11   b . The stop valve  11   c  controls flow rate of the cooling water to be supplied to the temperature controller  9  by controlling opening degree of the valve. The cooling oil is cooled to a temperature set by the temperature control dial  9   b . In the illustrated embodiment, the cooling oil is cooled to about 20 centigrades. 
     The coolant passages E, F, G at the stationary die  24  have inlet side passages e 1 , f 1 , g 1  and outlet side passages e 2 , f 2 , g 2 . The inlet side passages e 1 , f 1 , g 1  are connected to an inlet side manifold  6 B formed with a plurality of inlet holes. The inlet side manifold  6 B is connected to a temperature controller  10  through a supply pipe  6 A. The temperature controller  10  is exclusively used for the coolant passages E, F, G. The supply pipe  6 A and the inlet side manifold  6 B constitute a coolant supply circuit  6 . The outlet side passages e 2 , f 2 , g 2  are connected to a discharge side manifold  8 B formed with a plurality of discharge holes. The discharge side manifold  8 B is connected to the temperature controller  10  through a discharge pipe  8 A. The discharge manifold  8 B and the discharge pipe  8 A constitute a coolant discharge circuit  8 . The coolant supply circuit  6  and the coolant discharge circuit  8  constitute a coolant circulation circuit  4 . An arrangement of the temperature controller  10  is the same as that of the temperature controller  9 . An ON/OFF switch  10   a , a temperature control dial  10   b , and a temperature display  10   c  are similarly provided. Further, a cooling device  12  similar to the cooling device  11  is provided. A cooling water supply tube  12   a , a cooling water discharge tube  12   b  and a stop valve  12   c  are similarly provided. For circulating the coolant through the coolant circulation circuits  3  and  4 , pumps (not shown) are provided at the respective coolant circulation circuits. 
     In this way, in the depicted embodiment, the coolant passages A through G are grouped into two groups, and temperature controllers and coolant circulation circuits  3 ,  4  are also grouped into the equal number of groups, so that supply control and temperature control of the coolant is performed independently of each group. 
     Upon actuation of the pump (not shown) the cooling oil passes through the temperature controllers  9 ,  10  and the coolant supply circuit  5 ,  6  in which the cooling oil is flowed into a plurality of separate passages at the inlet side manifold  5 B,  6 B, and are supplied to the respective coolant passages A through G. Accordingly, predetermined portions of the metal mold  2  are cooled. Then, the cooling oil discharged from the respective coolant passages A through G is directed to the temperature controller  9 ,  10  through the coolant discharge circuits  7 ,  8 , and is cooled by the cooling device  11 ,  12 . Thereafter, the cooled coolant is again supplied to the coolant supply circuits  5 ,  6 . 
     Next, the coolant passages A through D in the movable die  22  will be described. FIG. 2 is a front view of the movable die  22  of the metal mold  2  according to the present embodiment. In FIG. 2, broken lines indicate the coolant passages A through D formed in the movable die  22 . Incidentally, coolant paths B 1  and B 2  are in fluid communication with each other to provide the coolant passage B. Each of the cooling passages A through D is defined by a deep groove having a sufficient width and a partitioning plate disposed within the groove. The groove and the partitioning plate have their shapes in conformance with the cavity shape and are positioned adjacent thereto. 
     The coolant passage A will be described. FIG. 3 is a cross-sectional view taken along the line III—III of FIG.  2 . The deep groove  30  is formed from a surface of the movable die  22  opposite to the surface at which the mold cavity  25  is provided. In FIG. 3, a cross-sectional shape of the deep groove  30  is defined by a vertical wall portions  30   a ,  30   b  extending generally in parallel with each other and a bottom wall portion  30   c . A distance W between the vertical wall portions  30   a  and  30   b  is relatively large such as from 30 to 80 mm to render the groove  30  to be wide. Further, the bottom wall portion  30   c  has a configuration in conformance with the contour of the mold cavity  25  such that a thickness t of the movable die  22  is approximately uniform along the bottom wall portion  30   c  to 3 mm. In other words, a distance between the mold cavity  25  and the bottom wall portion  30   c  is approximately 3 mm. 
     The partitioning plate  31  is disposed in the deep groove  30 . The partitioning plate  31  is welded to the movable die  22  such that the plate  31  is set from the surface of the movable die opposite to the surface of the mold cavity  25  as if a lid is covered over the groove  30 . A cross-sectional shape of the partitioning plate  31  is in conformance with the shape of the vertical wall portions  30   a ,  30   b  and the bottom wall portion  30   c  of the groove  30 . More specifically, the partitioning plate  31  has vertical wall portions  31   a ,  31   b  extending approximately in parallel with the vertical wall portions  30   a ,  30   b  of the groove  30 , and has a tip end portion  31   c  extending approximately in parallel with the bottom wall portion  30   c  of the groove  30 . As a result, a coolant path is defined at a space provided between the partitioning plate  31  and the groove  30 . To be more specific, a space between the vertical walls  30   a  and  31   a  serves as a supply path A 1 , a space between the bottom walls  30   c  and  31   c  serves as a main coolant path A 3  for cooling a metal mold part adjacent to the mold cavity  25 , and the space between the vertical walls  30   b  and  31   b  serves as discharge path A 2 . 
     As shown in FIG. 4, a pair of contact surfaces  31   d ,  31   d  defining a major outer contour of the partitioning plate  31  are in close contact with the vertical wall  30   a ,  30   b  of the groove  30 . The contact surfaces  31   d  extend in the extending direction of the vertical walls  31   a ,  31   b  and are oriented approximately perpendicular to the vertical walls  31   a ,  31   b  for defining the supply path Al and the discharge path A 2 . The contact surfaces  31   d ,  31   d  are formed with auxiliary paths  31   e ,  31   f ,  31   g  communicating the supply path A 1  with the discharge path A 2 . These auxiliary paths  31   e ,  31   f ,  31   g  can be provided by forming three grooves at the respective contacting surfaces  31   d ,  31   d  of the partitioning plate  31  as shown in FIGS. 3 and 4. Thus, a loop like fluid paths surrounding the partitioning plate  31  can be provided by the supply path A 1 , the discharge path A 2  and the auxiliary paths  31   e ,  31   f ,  31   g . As shown in FIG. 3, these auxiliary paths  31   e ,  31   f ,  31   g  are positioned only adjacent to the surface of the cavity  25 . With the formation of the auxiliary paths  31   e ,  31   f ,  31   g , the coolant passage A is branched into a plurality of paths adjacent to the mold cavity  25 . Therefore, the portion in the vicinity of the surface of the cavity  25  can be more uniformly cooled, because coolant also passes through the auxiliary paths  31   e ,  31   f ,  31   g.    
     A heat resistant packing  41  and a packing holder  40  are disposed at the surface of the movable die  22  opposite to the mold cavity  25  for hermetically sealing the coolant passage A. The packing  41  is formed with holes  41   a ,  41   b  at positions corresponding to open ends of the supply path A 1  and the discharge path A 2 . The packing holder  40  is formed with connection bores  40   a ,  40   b  each formed with a female thread at positions in alignment with the holes  41   a ,  41   b , respectively. A combination of the supply path A 1 , the hole  41   a  and the connection bore  40   a  corresponds to the inlet side passage a 1  shown in FIG. 1, and a combination of the discharge path A 2 , the hole  41   b  and the connection bores  40   b  corresponds to the outlet side passage a 2  shown in FIG.  1 . The connection bore  40   a  is connected to the inlet side manifold  5 B, and the connection bore  40   b  is connected to the outlet side manifold  7 B. Incidentally, in FIG. 3, the welding portion of the partitioning plate  31  to the movable die  22  cannot be shown because the cross-sectional plane contains the connections bores  40   a ,  40   b.    
     The coolant passage B will next be described. The coolant passage B includes the coolant paths B 1  and B 2  as shown in FIG.  1 . The coolant path B 1  is defined by a deep groove  32  and a partitioning plate  33  disposed therein as shown in FIG.  5 . The groove  32  has a bottom portion  32   c  whose shape is in conformance with the shape of the cavity  25 , and the partitioning plate  33  has a tip end portion  33   c  whose shape is in conformance with the bottom portion  32   c . Thus, a supply path B 1   a , a discharge path B 1   b  and a main coolant path B 1   c  are provided. Similar to the coolant passage A, the groove  32  has vertical wall portions  32   a ,  32   b , and the partitioning plate  33  has vertical wall portions  33   a ,  33   b . The partitioning plate  33  has contact surfaces  33   d  in close contact with the vertical wall portion of the groove  32 , and auxiliary paths  33   e ,  33   f  are formed on the contact surfaces  33   d  similar to the auxiliary paths  31   e ,  31   f ,  31   g . A communication path B 1   d  in communication with the coolant path B 2  is connected to the discharge path B 1   b  of the coolant path B 1 . The communication path B 1   d  is positioned near the surface opposite to the surface of the mold cavity  25 , and is in the form of a shallow groove  32   d  independent of the shape of the mold cavity. Similar to the first coolant passage A, a hole  41   c  in communication with the supply path B 1   a  is formed in the packing  41 , and a connection bore  40   c  formed with a female thread and in communication with the hole  41   c  is formed in the packing holder  40 . A combination of the supply path B 1   a , the hole  41   c  and the connection bore  40   c  constitute the inlet side passage b 1  shown in FIG.  1 . The connection bore  40   c  is connected to the inlet side manifold  5 B. 
     As shown in FIG. 6, the coolant path B 2  is defined by a deep groove  34  and a partitioning plate  35  disposed therein. The groove  34  has a bottom portion  34   c  whose shape is in conformance with the shape of the cavity  25 , and the partitioning plate  35  has a tip end portion  35   c  whose shape is in conformance with the bottom portion  34   c . Thus, a supply path B 2   a , a discharge path B 2   b  and a main coolant path B 2   c  are provided. The supply path B 2   a  is in communication with the communication path B 1   d , so that the coolant in the coolant path B 1  is introduced into the coolant path B 2 . Similar to the coolant path B 1 , the groove  34  has vertical wall portions  34   a ,  34   b , and the partitioning plate  35  has vertical wall portions  35   a ,  35   b . In order to promote uniform cooling, the coolant path B 2  has a supplemental cooling bore  34   d  along the surface of the cavity  25 . Similar to the first coolant passage A, a hole  41   d  in communication with the discharge path B 2   b  is formed in the packing  41 , and a connection bore  40   d  formed with a female thread and in communication with the hole  41   d  is formed in the packing holder  40 . A combination of the discharge path B 2   a , the hole  41   d  and the connection bore  40   d  constitute the outlet side passage b 2  shown in FIG.  1 . The connection bore  40   d  is connected to the outlet side manifold  7 B. 
     As shown in FIG. 4, similar to the coolant passage A, the coolant passages C and D are defined by deep grooves  36 ,  38  at which a thickness of the movable die  22  is about 3 mm, and partitioning plates  37 ,  39  disposed in the deep grooves  36 ,  38 , respectively. With the grooves and the partitioning plates, supply paths C 1 , D 1 , discharge paths C 2 , D 2  and main coolant paths (not shown) are provided. Further, the coolant passages E, F, G are defined in the stationary die  24  in arrangements similar to the cooling passage A formed in the movable die  22 . 
     While the invention has been described in detail and with reference to the specific embodiments thereof, it would be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention. For example, in the depicted embodiment, the movable die  22  has four coolant passages A through D and the stationary die  24  has three coolant passages E through G. However, the numbers of the passages are not limited to these numbers, but optimum numbers and shape can be determined in accordance with the shape of the mold cavity. 
     Further, in the depicted embodiment, a group of the plurality of coolant passages A through D are formed in the movable die  22 , and another group of the plurality of coolant passages E through G are formed in the stationary die  24 . However, the coolant passage should at least be formed in the movable die. That is, the movable die generally has a complicated construction with a plurality of protrusions, whereas the stationary die generally has a plane like simple construction. If the stationary die has a plane like simple construction, the cooling to the portion of the mold cavity can be achieved by forming the coolant passage in the movable die only. In the latter case, a plurality of coolant passages are grouped into a plurality of groups, and a plurality of temperature controllers with the numbers equal to the numbers of the groups are provided. Thus, a circulation circuit including a coolant supply circuit  5  and a coolant discharge circuit  7  can be provided in connection with an associated temperature controller for each group. Thus, coolant temperature control and coolant supply control can be made in each group. 
     Further, in the depicted embodiment, the partitioning plates  31 ,  33 ,  35 ,  37 ,  39  disposed in the deep grooves  30 ,  32 ,  36 ,  38  are fixed to the die by welding. However, any fixing arrangement such as fixing with bolts and force-fitting are available. 
     Further, in the depicted embodiment, three auxiliary paths  31   e ,  31   f ,  31   g  are formed in the partitioning plate  31 , and two auxiliary path  33   d ,  33   e  are formed in the partitioning plate  33 . However, the numbers of the auxiliary paths is not limited to these numbers, but at least one auxiliary path should be formed in the partitioning plate in order to enhance cooling performance. 
     INDUSTRIAL APPLIABILITY 
     A cooling arrangement for cooling a die-casting metal mold according to the present invention is widely available in a case where uniform cooling to the entirety of the die-casting metal mold is required, or in a case where different cooling temperatures are required for different local parts of the metal mold.