There is provided a plasticizing device including a rotor which rotates around a rotational axis, and has a groove forming surface provided with a groove, a barrel which is opposed to the groove forming surface, and has a communication hole, and a first heating section configured to heat a material fed between the rotor and the barrel, wherein the material fed between the rotor and the barrel is plasticized and discharged from the communication hole due to a rotation of the rotor and heating by the first heating section. In the plasticizing device, the first heating section includes a first portion configured to house a first heat source, includes a second portion which is disposed closer to the groove forming surface than the first portion in an axial direction of the rotational axis, and which has a shape surrounding the communication hole when viewed along the axial direction, and is configured so that heat by the first heat source is transferred to the material between the rotor and the barrel via the second portion.

The present application is based on, and claims priority from JP Application Serial Number 2020-093026, filed May 28, 2020, the disclosure of which is hereby incorporated by reference herein in its entirety.

BACKGROUND

1. Technical Field

The present disclosure relates to a plasticizing device, an injection molding device, and a three-dimensional modeling device.

2. Related Art

In JP-A-2009-269182 (Document 1), related to a plasticizing device for plasticizing a material to feed the material as a plasticized material, there is disclosed a device provided with a rotor having an end surface provided with spiral grooves, and a barrel having a communication hole at the center thereof and making contact with the end surface of the rotor. In such a plasticizing device, the material is heated by a heating device such as a heater while being conveyed toward a central part from the periphery of the rotor due to a rotation of the rotor between the rotor and the barrel to thereby be plasticized, and is then discharged from the communication hole.

In such a plasticizing device as in Document 1 described above, there occurs a temperature variation in a circumferential direction of the rotor in some cases between the rotor and the barrel depending on, for example, the shape of the heater or arrangement positions. When the temperature variation occurs in the circumferential direction of the rotor between the rotor and the barrel, there is a possibility that the plasticization state of the material varies depending on the orientation from the central part of the rotor even when, for example, the distance from the central part of the rotor is the same, and thus, the plasticization state and the delivery amount of the plasticized material thus generated are not stabilized.

SUMMARY

According to a first aspect of the present disclosure, there is provided a plasticizing device including a rotor which rotates around a rotational axis, and has a groove forming surface provided with a groove, a barrel which is opposed to the groove forming surface, and has a communication hole, and a first heating section configured to heat a material fed between the rotor and the barrel, wherein the material fed between the rotor and the barrel is plasticized and discharged from the communication hole due to a rotation of the rotor and heating by the first heating section. In the plasticizing device, the first heating section includes a first portion configured to house a first heat source, includes a second portion which is disposed closer to the groove forming surface than the first portion in an axial direction of the rotational axis, which has a shape surrounding the communication hole when viewed in the axial direction, and which connects to the first portion, and is configured so that heat by the first heat source is transferred to the material between the rotor and the barrel via the second portion.

According to a second aspect of the present disclosure, there is provided an injection molding device. The injection molding device includes the plasticizing device according to the first aspect described above, and an injection nozzle which is communicated with the communication hole, and is configured to inject the material plasticized into a molding die.

According to a third aspect of the present disclosure, there is provided a three-dimensional modeling device. The three-dimensional modeling device includes the plasticizing device according to the first aspect described above, and an ejection nozzle which is communicated with the communication hole, and is configured to eject the material plasticized toward a stage.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

A. First Embodiment

FIG.1is a diagram showing a schematic configuration of an injection molding device100according to the present embodiment. InFIG.1, there are shown the arrows along X, Y, and Z directions perpendicular to each other, respectively. The X, Y, and Z directions are directions along an X axis, a Y axis, and a Z axis as three spatial axes perpendicular to each other, and each include both of a direction toward one side along the X axis, the Y axis, or the Z axis, and the opposite direction thereof. The X axis and the Y axis are axes along a horizontal plane, and the Z axis is an axis along a vertical line. In other drawings, there are arbitrarily shown the arrows along the X, Y, and Z directions, respectively. The X, Y, and Z directions inFIG.1and the X, Y, and Z directions in other drawings represent the same directions, respectively.

The injection molding device100is provided with an injection unit105, a material feeding section110, a mold part160, a mold clamping device170, and a control section500. The injection molding device100plasticizes a material fed from the material feeding section110to generate a plasticized material, and then injects the plasticized material to the mold part160to thereby mold a molded object using the injection unit105.

FIG.2is a cross-sectional view showing a schematic configuration of the injection molding device100. InFIG.2, there are shown the injection unit105, the mold part160, the mold clamping device170, and the control section500of the injection molding device100. The injection unit105is provided with a plasticizing device120, an injection control section150, and an injection nozzle156.

The control section500is a device for performing control of the injection unit105and the mold clamping device170. The control section500is constituted by, for example, a computer provided with one or more processors, a main storage device, and an input/output interface, and a combination of a plurality of circuits.

The material feeding section110shown inFIG.1is communicated with the plasticizing device120shown inFIG.2. The material feeding section110feeds the material to the plasticizing device120. The material feeding section110in the present embodiment is formed of a hopper. In the material feeding section110, there is contained the material in the form of a pellet, a powder, or the like.

As shown inFIG.2, the plasticizing device120is provided with a rotor case121, a drive motor122, a rotor130, a barrel140, a check valve149, and a first heating section180. The plasticizing device120plasticizes at least a part of the material fed from the material feeding section110to generate the plasticized material in a paste form having fluidity, and then guides the plasticized material to the injection control section150. The term “plasticize” means that the material having a thermoplastic property is heated at a temperature no lower than the glass-transition point to thereby be softened, and thus, the fluidity is developed. The term “melt” not only means that the material having a thermoplastic property is heated at a temperature no lower than the melting point to thereby be in a liquid form, but also means that the material having the thermoplastic property is plasticized. It should be noted that the rotor130in the present embodiment is called a “scroll” or a “flat screw” in some cases, or is simply called a “screw” in some cases.

The rotor130has a substantially cylindrical shape smaller in height in a direction along a central axis RX than the diameter. The rotor130is housed in a space surrounded by the rotor case121and the barrel140. The rotor130has a groove forming surface132provided with grooves135on a surface opposed to the barrel140. Specifically, the groove forming surface132is opposed to an opposed surface142of the barrel140. The groove forming surface132is provided with protruding line parts136each having a curved shape. It should be noted that the central axis RX is referred to as a rotational axis of the rotor130in some cases. InFIG.2, the central axis RX is represented by a dashed-dotted line. Further, a direction along the central axis RX is referred to as an axial direction in some cases.

To a surface of the rotor130at the opposite side to the groove forming surface132, there is coupled the drive motor122. Due to the torque generated by the drive motor122, the rotor130rotates around the central axis RX as the rotational axis. The drive motor122is driven under the control by the control section500. It should be noted that the drive motor122is not required to directly be coupled to the rotor130. For example, it is possible for the rotor130and the drive motor122to be coupled to each other via a reduction mechanism. In this case, it is possible to adopt a configuration in which, for example, the drive motor122is coupled to a planet gear of the reduction mechanism having a planetary gear train, and the rotor130is coupled to a sun gear.

FIG.3is a perspective view showing a configuration at the groove forming surface132side of the rotor130. InFIG.3, a position of the central axis RX of the rotor130is represented by the dashed-dotted line. As described above, the groove forming surface132is provided with the grooves135.

The grooves135of the rotor130each form a so-called scrolling groove. The grooves135each extend in a vertical manner from a central part137toward an outer circumference of the rotor130so as to draw an arc. The grooves135can also be formed so as to extend forming an involute-curved shape or a spiral shape. The groove forming surface132is provided with the protruding line parts136each constituting a sidewall part of the groove135, and extending along each of the grooves135. The grooves135each continue to a material introduction port134formed on a side surface133of the rotor130. The material introduction ports134are each a portion for taking the material in the groove135. The material fed from the material feeding section110is fed between the rotor130and the barrel140via the material introduction ports134.

The central part137of the groove forming surface132of the rotor130is formed as a recess to which one ends of the grooves135are coupled. As shown inFIG.2, the central part137is opposed to a communication hole146provided to the opposed surface142of the barrel140. The central part137crosses the central axis RX.

The rotor130in the present embodiment is provided with a retention inhibition part138protruding toward the communication hole146at the central part137. In the present embodiment, the retention inhibition part138has a substantially conical shape, and a central axis of the retention inhibition part138substantially coincides with the central axis RX of the rotor130. A tip of the retention inhibition part138is disposed at an inner side of the communication hole146from an opening end of the communication hole146in the opposed surface142. Since the plasticized material in the central part137is efficiently guided by the retention inhibition part138to the communication hole146, the retention of the plasticized material is prevented. The retention of the plasticized material is also referred to as “stagnation” in some cases.

InFIG.3, there is shown an example of the rotor130having two grooves135and two protruding line parts136. The number of the grooves135and the number of the protruding line parts136provided to the rotor130are not limited to two. The rotor130can be provided with just one groove135, or can also be provided with a plurality of, namely three or more, grooves135. Further, it is also possible to dispose an arbitrary number of protruding line parts136in accordance with the number of the grooves135.

InFIG.3, there is illustrated an example of the rotor130having the material introduction ports134formed at two places. The number of the places where the material introduction ports134are disposed in the rotor130is not limited to two. It is possible to dispose the material introduction port134at just one place in the rotor130, or to dispose the material introduction ports134at a plurality of places, namely three or more places, in the rotor130.

FIG.4is an explanatory diagram showing a configuration at the opposed surface142side of the barrel140. As described above, the opposed surface142is a surface opposed to the groove forming surface132of the rotor130. At the center of the opposed surface142, there is disposed the communication hole146communicated with the injection nozzle156shown inFIG.2. On the periphery of the communication hole146in the opposed surface142, there is formed a plurality of guide grooves144. Each of the guide grooves144is coupled to the communication hole146in one end, and extends from the communication hole146forming a spiral shape. Each of the guide grooves144has a function of guiding the plasticized material to the communication hole146. It should be noted that it is not required to provide the guide grooves144to the barrel140.

As shown inFIG.2, the check valve149is disposed inside the communication hole146. The check valve149inhibits a reverse flow of the plasticized material from the communication hole146toward the central part137and the grooves135of the rotor130.

As shown inFIG.2, the first heating section180has a first portion181, a second portion182, and first heat sources183. The first heating section180heats the material fed between the rotor130and the barrel140with the heat of the first heat sources183. In the present embodiment, the output of the first heat sources183is controlled by the control section500. The details of the configuration of the first heating section180will be described later.

The plasticizing device120heats the material while conveying the material toward the communication hole146due to the rotation of the rotor130and the heating by the first heating section180described above to thereby form the plasticized material, and then discharges the plasticized material thus formed from the communication hole146. In particular, the plasticized material in the communication hole146is measured in weight by the injection control section150, and is then fed to the injection nozzle156.

As shown inFIG.2, the injection control section150is provided with a cylinder151, a plunger152, and a plunger drive section153. The cylinder151is a member which has a substantially cylindrical shape, and is coupled to the communication hole146of the barrel140. The plunger152moves inside the cylinder151. The plunger152is driven by the plunger drive section153constituted by a motor, gears, and so on. The plunger drive section153is controlled by the control section500.

The injection control section150slides the plunger152in the cylinder151to thereby perform a weighing operation and an injection operation under the control by the control section500. The weighing operation means an operation of moving the plunger152toward the +X direction of getting away from the communication hole146to thereby guide the plasticized material in the communication hole146to the inside of the cylinder151, and then measuring the weight of the plasticized material inside the cylinder151. The injection operation means an operation of moving the plunger152toward the −X direction of coming closer to the communication hole146to thereby inject the plasticized material located inside the cylinder151into a molding die via the injection nozzle156.

As described above, the injection nozzle156is communicated with the communication hole146. By performing the weighing operation and the injection operation described above, the plasticized material measured in weight in the cylinder151is fed from the injection control section150to the injection nozzle156via the communication hole146, and is then injected from the injection nozzle156into the mold part160. It should be noted that, for example, the injection molding device100can be provided with a heater for warming the injection nozzle156. By appropriately warming the injection nozzle156, it is possible to keep the fluidity of the plasticized material inside the injection nozzle156to improve the molding accuracy of the molded object.

The mold part160has a molding die161. The plasticized material fed to the injection nozzle156is injected from the injection nozzle156into a cavity Cv of the molding die161. Specifically, the molding die161has a movable mold162and a stationary mold163opposed to each other, and has the cavity Cv between the movable and stationary molds. The cavity Cv is a space corresponding to a shape of the molded object. In the present embodiment, the movable mold162and the stationary mold163are each formed of a metal material. It should be noted that it is possible for the movable mold162and the stationary mold163to be formed of a ceramics material or a resin material.

The mold clamping device170is provided with a mold drive section171and a ball screw part172. The mold drive section171is constituted by a motor, gears, and so on, and is coupled to the movable mold162via the ball screw part172. The drive by the mold drive section171is controlled by the control section500. The ball screw part172transmits the power of the drive by the mold drive section171to the movable mold162. The mold clamping device170moves the movable mold162using the mold drive section171and the ball screw part172under the control by the control section500to thereby perform opening and closing of the mold part160.

FIG.5is a diagram showing a cross-sectional surface of the first heating section180.FIG.6is a perspective view of the first heating section180. It should be noted that the injection nozzle156is omitted inFIG.6in order to make it easy to understand the configuration. Further, inFIG.6, a part of each of the first heat sources183is represented by dotted lines.

As shown inFIG.2andFIG.5, the first heating section180in the present embodiment is disposed below the barrel140. As described above, the first heating section180has the first portion181, the second portion182, and the first heat sources183.

The first portion181houses the first heat sources183. Specifically, the first portion181has a first housing part185and a first continuing part186. The first housing part185is a portion for housing the first heat sources183. The first continuing part186is a portion for connecting the first housing part185of the first portion181and the second portion182. In other words, in the present embodiment, the first portion181and the second portion182connect to each other via the first continuing part186.

As shown inFIG.5andFIG.6, the first housing part185of the first portion181in the present embodiment has a flat quadrangular prismatic shape low in height along the Y direction as the axial direction. The first housing part185is provided with four first through holes184penetrating the first housing part185in the Z direction. The four first through holes184each have a substantially cylindrical shape, and are arranged along the X direction. Further, in a central portion of the first housing part185when viewing the first housing part185along the Y direction, there is formed a space SP1awhich has a substantially cylindrical shape and penetrates the first housing part185in the Y direction.

As shown inFIG.2andFIG.5, the first portion181in the present embodiment is disposed at the +Y direction side of the barrel140without having contact with the barrel140. More particularly, between the first portion181, and the barrel140and the rotor130, there is disposed a heat-insulating part187. Specifically, as the heat-insulating part187, there is disposed an air gap between the first portion181and the barrel140.

The first heat sources183are each a heat source of the first heating section180wherein the heat sources are housed in the first portion181. In the present embodiment, the first heat sources183are housed in the first housing part185. It should be noted that inFIG.6, a portion of each of the first heat sources183which is housed in the first housing part185and is not exposed outside is represented by the dotted lines. As shown inFIG.6, the first heat sources183in the present embodiment are each a rod-like heater. Specifically, the first heat sources183each have a substantially cylindrical shape corresponding to the shape of the first through hole184described above. The first heat sources183are inserted one-by-one into the first through holes184to thereby be housed in the first housing part185. It should be noted that it is possible to adopt a configuration in which, for example, the first heat sources183are detachably attached to the first housing part185.

As shown inFIG.5andFIG.6, the second portion182has a flat substantially cylindrical shape low in height along the Y direction as the axial direction. In a central portion of the second portion182when viewing the second portion182along the Y direction, there is formed a space SP1cwhich has a substantially cylindrical shape and penetrates the second portion182in the Y direction. As shown inFIG.2andFIG.5, the second portion182is a portion disposed closer to the groove forming surface132than the first portion181in the Y direction as the axial direction. The second portion182in the present embodiment is partially embedded in the barrel140to thereby be fixed.

As shown inFIG.5andFIG.6, the first continuing part186in the present embodiment is a portion disposed between the first housing part185and the second portion182, and has a substantially circular truncated conical shape. In a central portion of the first continuing part186when viewing the first continuing part186along the Y direction, there is formed a space SP1bwhich has a substantially cylindrical shape and penetrates the first continuing part186in the Y direction.

As shown inFIG.5andFIG.6, the first heating section180is provided with a space SP1penetrating the first heating section180in the Y direction. Specifically, the space SP1aand the space SP1bprovided to the first portion181and the space SP1cprovided to the second portion182are communicated with each other to thereby form the space SP1. In the present embodiment, in this space SP1, there is inserted the injection nozzle156. Therefore, in at least a part in the Y direction of the injection nozzle156, the periphery at the X direction side and the Y direction side of the injection nozzle156is surrounded by the first portion181. Thus, since the heat of the first heat sources183housed in the first portion181is transferred to the injection nozzle156, it is possible to warm the injection nozzle156with the heat of the first heat sources183. Further, for example, when a nozzle heater for warming the injection nozzle156is provided, since it is possible to warm the injection nozzle156while suppressing the output of the nozzle heater, it is possible to enhance the overall thermal efficiency of the injection molding device100. It should be noted that in the present embodiment, between the injection nozzle156and the first portion181, there is disposed a gap Gp1. By providing the gap Gp1, excessive thermal transfer from the first heating section180to the injection nozzle156is prevented, and thus, the temperature of the injection nozzle156is prevented from excessively rising.

The first heating section180is configured to transfer the heat by the first heat sources183to the material fed between the rotor130and the barrel140via the second portion182due to the configuration described above. Specifically, in the present embodiment, the heat by the first heat sources183is first transferred to the first portion181which houses the first heat sources183. The heat transferred to the first portion181is transferred to the second portion182. The heat transferred to the second portion182is transferred to the barrel140, and is further transferred to the opposed surface142of the barrel140. Thus, the heat by the first heat sources183is transferred to an area between the rotor130and the barrel140, and is thus transferred to the material fed between the rotor130and the barrel140.

It should be noted that as described above, in the present embodiment, between the first portion181, and the barrel140and the rotor130, there is disposed the heat-insulating part187. Therefore, there is prevented the heat transfer without the intervention of the second portion182from the first heat sources183to the material between the rotor130and the barrel140. Further, as shown inFIG.2, since in the present embodiment, the air gap is disposed in the entire periphery of the first portion181, there is prevented the thermal influence of the unintended heat transfer to a variety of components constituting the injection molding device100.

Further, as described above, the second portion182in the present embodiment is partially embedded in the barrel140. In contrast, in another embodiment, the second portion182is not required to be embedded in the barrel140, and it is possible for the second portion182to, for example, be fixed via an adhesive or a bolt, or be welded so as to make contact with a surface at the opposite side to the opposed surface142of the barrel140from the +Y direction. Even in such a case, the heat by the first heat sources183is transferred via the second portion182to the material fed between the rotor130and the barrel140.

In the present embodiment, the first portion181and the second portion182constituting the first heating section180are integrally formed of stainless steel. In another embodiment, the first heating section180is not required to be formed of stainless steel, and can be formed of, for example, other metal. For example, it is possible for the rotor130and the barrel140to be formed of stainless steel, and it is possible for the first heating section180to be formed of aluminum having higher thermal conductivity than that of stainless steel. In this case, it is possible for the first heating section180to efficiently transfer the heat by the first heat sources183to the material via the second portion182. Further, it is possible for the first portion181and the second portion182constituting the first heating section180to be configured separately from each other, and it is possible for the members thus separated from each other to be fixed to each other with a bolt or an adhesive. In this case, it is possible for the first portion181and the second portion182to be formed of respective materials different from each other. Similarly, it is possible for the first housing part185and the first continuing part186constituting the first portion181to be configured separately from each other, or to be formed of respective materials different from each other. In this case, for example, by forming the first continuing part186with a material having high thermal conductivity, it is possible to efficiently transfer the heat of the first heat sources183to the second portion182via the first continuing part186.

FIG.7is a diagram for explaining a position where the second portion182overlaps the groove forming surface132. InFIG.7, there is shown a condition when viewing the groove forming surface132from the barrel140side along the Y direction as the axial direction. InFIG.7, the position where the groove forming surface132and the communication hole146overlap each other when viewed along the axial direction is represented by a dotted line, and the position where the groove forming surface132and the second portion182overlap each other is represented by the dashed-dotted lines and the halftone-dot hatching. It should be noted that the retention inhibition part138is omitted inFIG.7in order to make it easy to understand the configuration.

As shown inFIG.7, the second portion182has a shape surrounding the communication hole146when viewed along the Y direction as the axial direction. Specifically, the second portion182in the present embodiment has a ring-like shape when viewed along the Y direction. The communication hole146is disposed inside the ring of the second portion182when viewed along the Y direction. As described above, since the heat of the first heat sources183is transferred to the opposed surface142of the barrel140via the second portion182, the thermal distribution in the opposed surface142becomes the distribution surrounding the center of the communication hole146when viewed along the Y direction. Thus, the temperature unevenness in the circumferential direction of the rotor130is suppressed in the opposed surface142.

As shown inFIG.7, the groove forming surface132in the present embodiment has a first area R1and a second area R2. The second area R2is an area farther from the communication hole146than the first area R1when viewed along the Y direction as the axial direction. Specifically, when viewing the groove forming surface132along the Y direction, an area inside the boundary BR in the groove forming surface132corresponds to the first area R1, and an area outside the boundary BR corresponds to the second area R2. As shown inFIG.7, the second portion182overlaps the first area R1, but does not overlap the second area R2when viewed along the Y direction. Thus, since the heat of the first heat sources183is more easily transferred via the second portion182to a portion of the opposed surface142overlapping the first area R1when viewing the opposed surface142along the Y direction than to a portion of the opposed surface142overlapping the second area R2, the temperature of the portion of the opposed surface142overlapping the first area R1is apt to become high. Therefore, when plasticizing the material, the fluidity of the material in the peripheral portion of the rotor130is easily kept lower than the fluidity of the material in the central part137of the rotor130, and thus, the conveying force for conveying the material toward the center of the rotor130is easily obtained between the rotor130and the barrel140.

According to the plasticizing device120described hereinabove, there is adopted the configuration in which the heat by the first heat sources183housed in the first portion181is transferred to the material between the rotor130and the barrel140via the second portion182which has the shape of surrounding the communication hole146when viewed along the axial direction. Thus, since the thermal distribution between the rotor130and the barrel140becomes the distribution corresponding to the shape of the second portion182surrounding the communication hole146when viewed along the axial direction, the temperature unevenness in the circumferential direction of the rotor130is easily suppressed. Therefore, the plasticization state and the amount of the plasticized material to be formed are stabilized.

Further, in the present embodiment, the second portion182has the ring-like shape when viewed along the axial direction. Therefore, between the rotor130and the barrel140, the temperature unevenness in the circumferential direction of the rotor130is further suppressed, and thus, the plasticization state and the amount of the plasticized material to be formed are further stabilized.

Further, in the present embodiment, the first heat sources183are each the rod-like heater. Thus, even when the first heat sources183each have the rod-like shape, the thermal distribution between the rotor130and the barrel140becomes the distribution corresponding to the shape of the second portion182. Therefore, it is possible to reduce the cost necessary for procurement of the first heat sources183, and at the same time, it is possible to suppress the temperature unevenness in the circumferential direction of the rotor130between the rotor130and the barrel140.

Further, in the present embodiment, between the first portion181, and the rotor130and the barrel140, there is disposed the heat-insulating part187. Thus, the heat of the first heat sources183housed in the first portion181becomes easier to be transferred to an area between the rotor130and the barrel140via the second portion182. Therefore, between the rotor130and the barrel140, the temperature unevenness in the circumferential direction of the rotor130is further suppressed, and thus, the plasticization state and the amount of the plasticized material to be formed are further stabilized.

Further, in the present embodiment, the heat-insulating part187is provided with the air gap. Therefore, it is possible to prevent the heat transfer between the first portion181, and the rotor130and the barrel140by a simple configuration.

Further, in the present embodiment, the second portion182of the first heating section180and the first area R1of the groove forming surface132overlap each other, but the second portion182and the second area R2of the groove forming surface132do not overlap each other when viewed along the axial direction. Thus, when plasticizing the material, the temperature of a portion overlapping the first area R1when viewed along the axial direction is apt to become higher than the temperature of a portion overlapping the second area R2between the rotor130and the barrel140. Therefore, between the rotor130and the barrel140, the fluidity of the material in the outer circumferential portion of the rotor130is apt to be kept lower than the fluidity of the material in the central part of the rotor130. Therefore, it is easy to obtain the conveying force for conveying the material toward the center of the rotor130, and thus, the amount of the plasticized material to be formed is further stabilized.

Further, in the injection molding device100according to the present embodiment, the injection nozzle156is surrounded by the first portion181in at least a part of the injection nozzle156in the axial direction thereof. Therefore, by warming the injection nozzle156with the first heating section180, it is possible to keep the fluidity of the plasticized material inside the injection nozzle156to improve the molding accuracy of the molded object.

B. Second Embodiment

FIG.8is a diagram showing a cross-sectional surface of a first heating section180band a second heating section190in a second embodiment.FIG.9is a cross-sectional view of the first heating section180band the second heating section190in the IX-IX cross-sectional line inFIG.8. As shown inFIG.8andFIG.9, the plasticizing device120baccording to the present embodiment is provided with the second heating section190in addition to the first heating section180b. It should be noted that in the configuration of the injection molding device100and the plasticizing device120baccording to the second embodiment, a portion not particularly described is substantially the same as in the first embodiment.

In the present embodiment, unlike the first embodiment, a first portion181bhas a space SP3awhich penetrates a first housing part185bin the Y direction, and has a substantially quadrangular prismatic shape, and a space SP3bwhich penetrates a first continuing part186bin the Y direction, and has a substantially cylindrical shape, and a second portion182bhas a space SP3cwhich penetrates the second portion182bin the Y direction, and has a substantially cylindrical shape. The space SP3a, the space SP3b, and the space SP3cform a space SP3which penetrates the first heating section180bin the Y direction.

First heat sources183bare housed in the first housing part185bof the first portion181bsimilarly to the first embodiment. As shown inFIG.8, in the present embodiment, the first housing part185bis provided with the two first through holes184, and the first heat sources183bas the rod-like heaters are inserted one-by-one into the respective first through holes184.

The second heating section190has a third portion191, a fourth portion192, and second heat sources193. As shown inFIG.8andFIG.9, the second heating section190in the present embodiment is disposed so as to be surrounded by the first heating section180b. Specifically, the second heating section190is disposed inside the space SP3described above. Further, as shown inFIG.8andFIG.9, the first heating section180band the second heating section190in the present embodiment are disposed via a gap with each other. Thus, the heat transfer between the first heating section180band the second heating section190is suppressed. It is possible to dispose a thermal insulation material such as glass wool between the first heating section180band the second heating section190.

The third portion191houses the second heat sources193. Specifically, the third portion191has a second housing part195and a second continuing part196. The second housing part195is a portion for housing the second heat sources193. The second continuing part196is a portion for connecting the second housing part195of the third portion191and the fourth portion192. In other words, in the present embodiment, the third portion191and the fourth portion192connect to each other via the second continuing part196.

The second housing part195of the third portion191in the present embodiment has a flat quadrangular prismatic shape low in height along the Y direction as the axial direction. As shown inFIG.8andFIG.9, the second housing part195is provided with two second through holes194penetrating the second housing part195in the Z direction. The two second through holes194each have a substantially cylindrical shape, and are arranged along the X direction. Further, in a central portion of the second housing part195when viewing the second housing part195in the Y direction, there is formed a space SP2awhich has a substantially cylindrical shape and penetrates the second housing part195in the Y direction.

Between the third portion191, and the barrel140and the rotor130, there is disposed an air gap, and thus, the third portion191is disposed at the +Y direction side of the barrel140without having contact with the barrel140.

The second heat sources193are each a heat source of the second heating section190wherein the heat sources are housed in the third portion191. In the present embodiment, the second heat sources193are housed in the second housing part195. As shown inFIG.8andFIG.9, the second heat sources193in the present embodiment is each a rod-like heater similarly to the first heat sources183b. The second heat sources193each have a substantially cylindrical shape corresponding to the shape of the second through hole194described above, and are inserted one-by-one into the respective second through holes194. In the present embodiment, the output of the second heat sources193is controlled by the control section500. It should be noted that the length in the Z direction of the second through hole194in the present embodiment is shorter than the length in the Z direction of the first through hole184, and the length in the Z direction of the second heat source193is shorter than the length in the Z direction of the first heat source183b. Further, it is possible to adopt a configuration in which, for example, the second heat sources193are detachably attached to the second housing part195.

The fourth portion192has a flat substantially cylindrical shape low in height along the Y direction as the axial direction. In a central portion of the fourth portion192when viewing the fourth portion192along the Y direction, there is formed a space SP2cwhich has a substantially cylindrical shape and penetrates the fourth portion192in the Y direction. As shown inFIG.8, the fourth portion192is a portion disposed closer to the groove forming surface132than the third portion191in the Y direction as the axial direction. As shown inFIG.8, the fourth portion192in the present embodiment is partially embedded in the barrel140to thereby be fixed similarly to the second portion182b.

The second continuing part196is a portion disposed between the third portion191and the fourth portion192, and has a substantially circular truncated conical shape. In a central portion of the second continuing part196when viewing the second continuing part196along the Y direction, there is formed a space SP2bwhich has a substantially cylindrical shape and penetrates the second continuing part196in the Y direction.

As shown inFIG.8, the second heating section190is provided with a space SP2penetrating the second heating section190in the Y direction. Specifically, the space SP2aand the space SP2bprovided to the third portion191and the space SP2cprovided to the fourth portion192are communicated with each other to thereby form the space SP2. In the present embodiment, in this space SP2, there is inserted the injection nozzle156. It should be noted that as shown inFIG.9, between the injection nozzle156and the second heating section190, there is formed a gap.

The second heating section190in the present embodiment is constituted by the third portion191and the fourth portion192integrally formed of stainless steel. In another embodiment, the second heating section190can be formed of other metal such as aluminum. Further, the third portion191and the fourth portion192can be formed separately from each other, or can also be formed of respective materials different from each other. Similarly, it is possible for the second housing part195and the second continuing part196constituting the third portion191to be configured separately from each other, or to be formed of respective materials different from each other.

The second heating section190is configured to transfer the heat by the second heat sources193to the material fed between the rotor130and the barrel140via the fourth portion192due to the configuration described above. Specifically, the heat by the second heat sources193is first transferred to the third portion191which houses the second heat sources193. The heat transferred to the third portion191is transferred to the fourth portion192. The heat transferred to the fourth portion192is transferred to the barrel140, and is further transferred to the opposed surface142of the barrel140. Thus, the heat by the second heat sources193is transferred to the material fed between the rotor130and the barrel140.

It should be noted that as described above, since the gap is disposed between the third portion191, and the barrel140and the rotor130in the present embodiment, the heat transfer from the second heat sources193to the material between the rotor130and the barrel140without the intervention of the fourth portion192is suppressed.

FIG.10is a diagram for explaining positions where the second portion182band the fourth portion192respectively overlap the groove forming surface132. InFIG.10, there is shown a condition when viewing the groove forming surface132from the barrel140side along the Y direction as the axial direction similarly toFIG.7. InFIG.10, the position where the communication hole146overlaps and the position where the second portion182boverlaps are shown similarly toFIG.7, and in addition, the position where the fourth portion192overlaps is represented by the dashed-dotted lines and the halftone-dot hatching.

As shown inFIG.10, the fourth portion192has a shape surrounding the communication hole146of the barrel140when viewed along the Y direction as the axial direction similarly to the second portion182b. Further, the fourth portion192is located at a position closer to the communication hole146than the second portion182bwhen viewed along the Y direction. Specifically, in the present embodiment, the second portion182bhas a ring-like shape which overlaps the second area R2of the groove forming surface132but does not overlap the first area R1, and the fourth portion192has a ring-like shape which overlaps the first area R1but does not overlap the second area R2. Further, the communication hole146is disposed inside the ring of the fourth portion192when viewed along the Y direction, and the fourth portion192surrounding the communication hole146is disposed inside the ring of the second portion182bwhen viewed along the Y direction.

The first heat sources183bof the first heating section180bdescribed above and the second heat sources193of the second heating section190are configured to be able to individually be controlled. The first heat sources183band the second heat sources193are individually controlled by the control section500. As described above, in the present embodiment, the heat of the first heat sources183bis transferred to the opposed surface142of the barrel140via the second portion182b, and the heat of the second heat sources193is transferred to the opposed surface142via the fourth portion192. Therefore, it is possible for the control section500to make the temperature of, for example, a portion close to the central part137of the rotor130higher than the temperature of a portion far from the central part137of the rotor130in an area between the rotor130and the barrel140by individually controlling the first heat sources183band the second heat sources193. It should be noted that it is possible for the control section500to obtain the temperature of, for example, the portion overlapping the first area R1of the opposed surface142and the portion overlapping the second area R2using a temperature sensor formed of a thermocouple or the like and then control the first heat sources183band the second heat sources193in accordance with the temperature thus obtained.

According also to the plasticizing device120brelated to the second embodiment described hereinabove, between the rotor130and the barrel140, the temperature unevenness in the circumferential direction of the rotor130is suppressed, and thus, the plasticization state and the amount of the plasticized material to be formed are stabilized. In particular, in the present embodiment, the fourth portion192of the second heating section190is located at the position closer to the communication hole146than the second portion182bof the first heating section180bwhen viewed along the axial direction, and the first heat sources183bof the first heating section180band the second heat sources193of the second heating section190are configured to be able to individually be controlled. Thus, it is possible to make the temperature of a portion closer to the central part137of the rotor130different from the temperature of a portion farther from the central part137in the area between the rotor130and the barrel140by individually controlling the first heat sources183band the second heat sources193. Therefore, for example, by controlling the temperature of the portion closer to the central part137of the rotor130to be higher than the temperature of the portion farther from the central part137, it is possible to further stabilize the amount of the plasticized material to be formed.

It should be noted that in the second embodiment, the third portion191of the second heating section190is located at a position closer to the communication hole146than the first portion181bof the first heating section180bwhen viewed along the axial direction. In contrast, in another embodiment, the third portion191is not required to be located at a position closer to the communication hole146than the first portion181bwhen viewed along the axial direction. For example, it is possible to adopt a configuration in which the second heating section190is inserted from the −Y direction side with respect to the first heating section180b, and the third portion191which is formed so as to be larger in size than the first portion181bin the X direction and the Y direction is located at the −Y direction side of the first portion181b. Even in this case, since the fourth portion192of the second heating section190is located at the position closer to the communication hole146than the second portion182bof the first heating section180bwhen viewed along the axial direction, and the first heat sources183band the second heat sources193are configured to be able to individually be controlled, it is possible to further stabilize the amount of the plasticized material to be formed.

FIG.11is a cross-sectional view showing a schematic configuration of an injection molding device100according to a third embodiment. A first heating section180cin the present embodiment is disposed inside a barrel140cunlike the first embodiment. It should be noted that in the configuration of the injection molding device100and the plasticizing device120caccording to the third embodiment, a portion not particularly described is substantially the same as in the first embodiment.

The barrel140cin the present embodiment is provided with a space SP4. The space SP4is a space which is formed inside the barrel140c, and has a substantially cylindrical shape. The first heating section180cin the present embodiment is disposed inside the space SP4. Between the first portion181of the first heating section180cand the barrel140c, there is disposed a heat-insulating part187csimilarly to the first embodiment. Specifically, the heat-insulating part187cin the present embodiment is disposed so as to cover the outer edge of the first portion181. The heat-insulating part187cin the present embodiment is formed of a heat insulating material such as glass wool. It should be noted that the heat-insulating part187ccan be provided with an air gap similarly to, for example, the first embodiment.

According also to the plasticizing device120crelated to the third embodiment described hereinabove, the temperature unevenness in the circumferential direction of the rotor130is suppressed, and thus, the plasticization state and the amount of the plasticized material to be formed are stabilized. In particular, in the present embodiment, even when disposing the first heating section180cin the barrel140c, it is possible to stabilize the plasticization state and the amount of the plasticized material to be formed.

FIG.12is an explanatory diagram showing a schematic configuration of a three-dimensional modeling device as a fourth embodiment. The three-dimensional modeling device10is provided with an ejection nozzle61, the material feeding section110, the plasticizing device120, a stage300, a displacement mechanism400, and a control section500d. The three-dimensional modeling device10according to the present embodiment plasticizes the material fed from the material feeding section110with the plasticizing device120, and then ejects the material thus plasticized toward the stage300from the ejection nozzle61.

The displacement mechanism400is configured to be able to change a relative position between the ejection nozzle and the stage300. In the present embodiment, the displacement mechanism400displaces the stage300without displacing the ejection nozzle61. The displacement mechanism400is formed of a triaxial positioner for moving the stage300in triaxial directions, namely the X, Y, and Z directions with driving forces of three motors. The displacement mechanism400is controlled by the control section500d. It should be noted that in another embodiment, it is possible to displace the ejection nozzle61without displacing the stage300to thereby change the relative position between the ejection nozzle61and the stage300. Further, it is also possible for the displacement mechanism400to displace both of the ejection nozzle61and the stage300.

The control section500dis formed of a computer or the like similarly to the control section500. The control section500dcontrols the displacement mechanism400and the plasticizing device120in accordance with modeling data obtained in advance to thereby eject the material thus plasticized at an arbitrary position on the stage300from the ejection nozzle61, and thus, models a three-dimensional shaped article. It should be noted that the three-dimensional shaped article is also referred to simply as a shaped article in some cases.

The plasticizing device120is provided with the drive motor122, the rotor130rotating centering on the rotational axis due to the drive motor122, the barrel140, and the first heating section180similarly to the first embodiment. Similarly to the first embodiment, the plasticizing device120heats the material while conveying the material toward the communication hole146due to the rotation of the rotor130and the heating by the first heating section180to thereby plasticize the material, and then discharges the plasticized material from the communication hole146. The plasticized material discharged from the communication hole146flows to the ejection nozzle61.

It should be noted that the three-dimensional modeling device10can be provided with a nozzle heater for warming the ejection nozzle61. By appropriately warming the ejection nozzle61, it is possible to keep the fluidity of the plasticized material inside the ejection nozzle61to improve the modeling accuracy of the shaped article.

Similarly to the first embodiment, the first heating section180has the first portion181, the second portion182, and the first heat sources183. It should be noted that the first portion181in the present embodiment is disposed at the −Z direction side of the barrel140without having contact with the barrel140. The first housing part185of the first portion181is provided with the four first through holes184extending in the Y direction, and arranged along the X direction. The first heat sources183are respectively housed in the first through holes184similarly to the first embodiment.

Also in the present embodiment, similarly to the first embodiment, the first heating section180is configured to transfer the heat by the first heat sources183to the material fed between the rotor130and the barrel140via the second portion182.

It should be noted that as shown inFIG.12, in the present embodiment, in the space SP1of the first heating section180, there is inserted the ejection nozzle61. Therefore, the periphery of the ejection nozzle61is surrounded by the first portion181in a part in the Z direction as the axial direction. Thus, since the heat of the first heat sources183housed in the first portion181is transferred to the ejection nozzle61, it is possible to warm the ejection nozzle61with the heat of the first heat sources183. Further, for example, even when a nozzle heater for warming the ejection nozzle61is provided, since it is possible to warm the ejection nozzle61while suppressing the output of the nozzle heater, it is possible to enhance the overall thermal efficiency of the three-dimensional modeling device10. It should be noted that in the present embodiment, between the ejection nozzle61and the first portion181, there is disposed a gap Gp2. By providing the gap Gp2, excessive thermal transfer from the first heating section180to the ejection nozzle61is prevented, and thus, the temperature of the ejection nozzle61is prevented from excessively rising.

According to the three-dimensional modeling device related to the fourth embodiment described hereinabove, there is provided the plasticizing device120similarly to the first embodiment, and the plasticizing device120is configured so that the heat by the first heat sources183housed in the first portion181is transferred to the material between the rotor130and the barrel140via the second portion182which has the shape of surrounding the communication hole146when viewed in the axial direction. Thus, since the thermal distribution between the rotor130and the barrel140becomes the distribution corresponding to the second portion182surrounding the communication hole146when viewed along the axial direction, the temperature unevenness in the circumferential direction of the rotor130is easily suppressed. Therefore, the plasticization state and the amount of the plasticized material are stabilized.

Further, in the three-dimensional modeling device10according to the present embodiment, the periphery of the ejection nozzle61is surrounded by the first portion181in at least a part of the ejection nozzle61in the axial direction thereof. Therefore, by warming the ejection nozzle61with the first heating section180, it is possible to keep the fluidity of the plasticized material inside the ejection nozzle61to improve the modeling accuracy of the shaped article.

E. Other Embodiments

(E-1) In the embodiments described above, the first heating section180is provided to the barrel140. In contrast, it is possible for the first heating section180to be provided to the rotor130instead of the barrel140. For example, it is possible for the first heating section180to be disposed so that a part of the second portion182has contact with the rotor130, or so that the second portion182is embedded in the rotor130. Further, it is possible for the first heating section180to be disposed inside the rotor130. In this case, the heat by the first heat sources183is transferred via the second portion182to the rotor130, and is further transferred to the groove forming surface132. Thus, the heat is transferred to an area between the rotor130and the barrel140, and is thus transferred to the material fed between the rotor130and the barrel140.

(E-2) In the embodiments described above, the second portion182has the ring-like shape when viewed along the axial direction. In contrast, the second portion182is not required to have the ring-like shape when viewed along the axial direction. For example, the outer circumferential edge or the inner circumferential edge of the second portion182when viewing the second portion182along the axial direction can be formed of a polygon having three or more vertexes. Further, the shape of the outer circumferential edge or the inner circumferential edge of the second portion182when viewing the second portion182along the axial direction can be, for example, a shape obtained by combining straight lines and curved lines with each other. Further, the outer circumferential edge and the inner circumferential edge of the second portion182when viewing the second portion182in the axial direction are not required to have similarity shapes. It should be noted that in a similar way, the fourth portion192is not required to have a ring-like shape when viewed along the axial direction.

(E-3) In the embodiments described above, the first heat sources183are each the rod-like heater. In contrast, the first heat sources183are not required to be the rod-like heater. The first heat source183can be, for example, a heater having a different shape. Similarly, the second heat sources193are not required to be the rod-like heater.

(E-4) In the embodiments described above, between the first portion181, and the rotor130and the barrel140, there is disposed the air gap as the heat-insulating part187. In contrast, the heat-insulating part187is not required to be provided with the air gap. For example, it is possible for the heat-insulating part187to be formed of a heat insulating material such as glass wool for insulating the first portion181from the rotor130and the barrel140. Further, the heat-insulating part187is not required to be disposed between the first portion181, and the rotor130and the barrel140, and it is also possible for the first portion181to have direct contact with the rotor130or the barrel140.

(E-5) In the embodiments described above, the second portion182overlaps the first area R1, but does not overlap the second area R2when viewed along the axial direction. In contrast, the second portion182is not required to overlap the first area R1, and can overlap the second area R2, for example, when viewed along the axial direction. In this case, it is possible for the second portion182to be disposed so as to overlap the outer circumferential edge of the groove forming surface132, for example, when viewed along the axial direction.

(E-6) In the embodiments described above, the periphery of the injection nozzle156is surrounded by the first portion181in at least a part of the injection nozzle156in the axial direction thereof. In contrast, the injection nozzle156is not required to be surrounded by the first portion181. Similarly, the ejection nozzle61is not required to be surrounded by the first portion181.

(E-7) In the embodiments described above, the first portion181has the first continuing part186. In contrast, the first portion181is not required to have the first continuing part186. For example, a portion corresponding to the first housing part185of the first portion181and the second portion182can directly connect to each other. Further, for example, the second portion182can be provided with a continuing portion for connecting the first portion181and the second portion182to each other, and the first portion181and the second portion182can connect to each other with the continuing portion. Similarly, the third portion191is not required to have the second continuing part196.

F. Other Aspects

The present disclosure is not limited to the embodiments described above, but can be implemented in a variety of aspects within the scope or the spirit of the present disclosure. For example, the present disclosure can also be implemented in the following aspects. The technical features in each of the embodiments described above corresponding to the technical features in each of the aspects described below can arbitrarily be replaced or combined in order to solve some or all of the problems of the present disclosure, or to achieve some or all of the advantages of the present disclosure. Further, the technical feature can arbitrarily be eliminated unless described in the present specification as an essential element.

(1) According to a first aspect of the present disclosure, there is provided a plasticizing device including a rotor which rotates around a rotational axis, and has a groove forming surface provided with a groove, a barrel which is opposed to the groove forming surface, and has a communication hole, and a first heating section configured to heat a material fed between the rotor and the barrel, wherein the material fed between the rotor and the barrel is plasticized and discharged from the communication hole due to a rotation of the rotor and heating by the first heating section. In the plasticizing device, the first heating section includes a first portion configured to house a first heat source, includes a second portion which is disposed closer to the groove forming surface than the first portion in an axial direction of the rotational axis, which has a shape surrounding the communication hole when viewed along the axial direction, and which connects to the first portion, and is configured so that heat by the first heat source is transferred to the material between the rotor and the barrel via the second portion.

According to such an aspect as described above, since the thermal distribution between the rotor and the barrel becomes the distribution corresponding to the shape of the second portion surrounding the communication hole when viewed along the axial direction, the temperature unevenness in the circumferential direction of the rotor is easily suppressed. Therefore, the plasticization state and the amount of the plasticized material to be formed are stabilized.

(2) In the plasticizing device according to the aspect described above, the second portion may have a ring-like shape when viewed along the axial direction. According to such an aspect as described above, between the rotor and the barrel, the temperature unevenness in the circumferential direction of the rotor is further suppressed, and thus, the plasticization state and the amount of the plasticized material to be formed are further stabilized.

(3) In the plasticizing device according to the aspect described above, the first heat source may be a rod-like heater. According to such an aspect as described above, even when the first heat source has the rod-like shape, the thermal distribution between the rotor and the barrel becomes the distribution corresponding to the shape of the second portion. Therefore, it is possible to reduce the cost necessary for procurement of the first heat source, and at the same time, it is possible to suppress the temperature unevenness in the circumferential direction of the rotor between the rotor and the barrel.

(4) In the plasticizing device according to the aspect described above, there may further be included a heat-insulating part disposed between the first portion, and the rotor and the barrel. According to such an aspect as described above, the heat of the first heat source housed in the first portion becomes easier to be transferred to an area between the rotor and the barrel via the second portion. Therefore, between the rotor and the barrel, the temperature unevenness in the circumferential direction of the rotor is further suppressed, and thus, the plasticization state and the amount of the plasticized material to be formed are further stabilized.

(5) In the plasticizing device according to the aspect described above, the heat-insulating part may be provided with an air gap. According to such an aspect as described above, it is possible to prevent the heat transfer between the first portion, and the rotor and the barrel by a simple configuration.

(6) In the plasticizing device according to the aspect described above, the groove forming surface may include a first area, and a second area farther from the communication hole than the first area, and the second portion may overlap the first area, and may fail to overlap the second area when viewed along the axial direction. According to such an aspect as described above, when plasticizing the material, since the temperature of the portion overlapping the first area when viewed along the axial direction is apt to become higher than the temperature of the portion overlapping the second area between the rotor and the barrel, the fluidity of the material in the outer circumferential portion of the rotor is apt to be kept lower than the fluidity of the material in the central part of the rotor. Therefore, it is easy to obtain the conveying force for conveying the material toward the center of the rotor, and thus, the amount of the plasticized material to be formed is further stabilized.

(7) In the plasticizing device according to the aspect described above, there may further be included a second heating section configured to heat the material fed between the groove and the barrel, wherein the second heating section may include a third portion configured to house a second heat source, may include a fourth portion which is disposed closer to the groove forming surface than the third portion in the axial direction, which has a shape surrounding the communication hole when viewed along the axial direction, and which connects to the third portion, and may be configured so that heat by the second heat source is transferred to the material fed between the groove and the barrel via the fourth portion, the fourth portion may be located at a position closer to the communication hole than the second portion when viewed along the axial direction, and the first heat source and the second heat source may be configured to individually be controlled. According to such an aspect as described above, it is possible to make the temperature of the portion closer to the central part of the rotor different from the temperature of the portion farther from the central part in the area between the rotor and the barrel by individually controlling the first heat source and the second heat source. Therefore, for example, by controlling the temperature of the portion closer to the central part of the rotor to be higher than the temperature of the portion farther from the central part, it is possible to further stabilize the amount of the plasticized material to be formed.

(8) According to a second aspect of the present disclosure, there is provided an injection molding device. The injection molding device includes the plasticizing device according to the first aspect described above, and an injection nozzle which is communicated with the communication hole, and is configured to inject the material plasticized into a molding die.

According to such an aspect as described above, since the thermal distribution between the rotor and the barrel becomes the distribution corresponding to the shape of the second portion surrounding the communication hole when viewed along the axial direction, the temperature unevenness in the circumferential direction of the rotor is easily suppressed. Therefore, the plasticization state and the amount of the plasticized material to be formed are stabilized.

(9) In the injection molding device according to the aspect described, the injection nozzle may be surrounded by the first portion in at least a part in the axial direction of the injection nozzle. According to such an aspect as described above, by warming the injection nozzle with the first heating section, it is possible to keep the fluidity of the plasticized material inside the injection nozzle to improve the molding accuracy of the molded object.

(10) According to a third aspect of the present disclosure, there is provided a three-dimensional modeling device. The three-dimensional modeling device includes the plasticizing device according to the first aspect described above, and an ejection nozzle which is communicated with the communication hole, and is configured to eject the material plasticized toward a stage.

According to such an aspect as described above, since the thermal distribution between the rotor and the barrel becomes the distribution corresponding to the shape of the second portion surrounding the communication hole when viewed along the axial direction, the temperature unevenness in the circumferential direction of the rotor is easily suppressed. Therefore, the plasticization state and the amount of the plasticized material to be formed are stabilized.

(11) In the three-dimensional modeling device according to the aspect described above, the ejection nozzle may be surrounded by the first portion in at least a part in the axial direction of the ejection nozzle. According to such an aspect as described above, by warming the ejection nozzle with the first heating section, it is possible to keep the fluidity of the plasticized material inside the ejection nozzle to improve the modeling accuracy of the shaped article.

The present disclosure is not limited to the aspects as the plasticizing device, the injection molding device, and the three-dimensional modeling device described above, but can be implemented in a variety of aspects. For example, the present disclosure can be implemented as an extrusion molding device, or a variety of devices equipped with a plasticizing device.