Resin molding die

Abstract

To provide a resin molding die that can ensure ease of maintenance, etc. while forming a structure for multiple cavities.SOLUTION: A resin molding die 10 is a mold that performs multiple-piece molding by using a hot runner. The resin molding die 10 includes a stationary side mold 11 and a movable side mold 12. The stationary side mold 11 includes: a stationary side mold body part 111; a stationary side hole part 112 formed in the stationary side mold body part 111; and a stationary side cavity component member 113 stored in the stationary side hole part 112. The movable side mold 12 includes: a movable side mold body part 121; the stationary side hole part 112 formed in the movable side mold body part 121; and a movable side core component member 123 stored in the stationary side hole part 112. The stationary side cavity component member 113 and the movable side core component member 123 form a cavity 13 in which a resin molded product is injection molded.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a resin molding die, and particularly to a resin molding die for multi-cavity molding.

Background Art

[0002] Generally, when performing resin molding using a die, in order to improve production efficiency, multi-cavity molding may be carried out. To perform multi-cavity molding, a structure for a plurality of cavities is required on the die. As a specific example of realizing such a structure, for example, there is a structure in which a plurality of cavity plates are made and fixed on the cavity plate by screwing or the like.

[0003] FIG. 10(A) is a cross-sectional view showing an injection molding apparatus 500 as such a die. The injection molding apparatus 500 mainly includes a manifold 501, a heat insulation plate 502, a cavity body 503, a cavity block 504, a core block 506, and a core plate 505.

[0004] The nozzle 511 is housed in a hole formed in the cavity body 503, the upper end thereof faces a hole formed in the manifold 501, and the lower end thereof faces the lower surface of the cavity body 503. Further, a heat insulation plate 502 is disposed on the upper surface of the cavity body 503.

[0005] A cavity 509 is formed as a gap between the cavity block 504 and the core block 506. The cavity block 504 is fastened to the lower surface of the cavity body 503 by bolts 507. Further, the core block 506 is fastened to the upper surface of the core plate 505 by bolts 508. Furthermore, a push pin 510 is disposed in holes formed in the core plate 505 and the core block 506. The upper end of the push pin 510 is disposed at the lower end of the cavity 509.

[0006] When injecting and molding a resin molded product using the injection molding apparatus 500 having the above-described configuration, the molten resin is enclosed in the cavity 509 from the side of the manifold 501 via the inside of the nozzle 511. After the enclosed resin has hardened, the cavity block 504 and the core block 506 are separated, and further, the resin molded product can be taken out by protruding the push pin 510 upward.

[0007] Also, as another method, there is a method of creating a structure for a plurality of cavities on the cavity plate. With this method, a large number of cavities can be provided according to the size of the nozzle.

[0008] FIG. 10(B) is a cross-sectional view showing an injection molding apparatus 520 as such a mold. The basic configuration of the injection molding apparatus 520 is the same as that of the injection molding apparatus 500 described above.

[0009] The injection molding apparatus 500 mainly includes a manifold 521, a heat insulating plate 522, a cavity main body 523, a core block 526, a core plate 525, a nozzle 529, and a push pin 528.

[0010] Here, by partially making the lower surface of the cavity main body 523 concave, a concave portion 524 is formed. The cavity 527 is formed as a gap between the concave portion 524 and the core block 526. The injection molding method using the injection molding apparatus 520 is the same as the injection molding method using the injection molding apparatus 500.

[0011] The configuration of such an injection molding apparatus is described in, for example, Patent Document 1 and Patent Document 2.

Prior Art Documents

Patent Documents

[0012]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0013] However, in the injection molding apparatus 500 shown in Fig. 10(A), regions for screwing bolts 507 and 508 are required in the cavity body 503 and the core plate 505. Therefore, the configuration for disposing the bolts 507 and 508 becomes a limitation when increasing the cavity 509.

[0014] Also, in the injection molding apparatus 520 shown in Fig. 10(B), it is laborious to form the concave portions 524, which are a plurality of mold structures, in the cavity body 523. Even if some of the concave portions 524 are damaged, there is a risk that the cavity body 523 cannot be used as a whole.

[0015] The present invention has been made in view of such problems, and an object of the present invention is to provide a resin molding die that can ensure ease of maintenance and the like while forming a structure for a plurality of cavities.

Means for Solving the Problems

[0016] The present invention is a resin molding die that performs multi-cavity molding using a hot runner, and includes a fixed-side die and a movable-side die. The fixed-side die has a fixed-side die body portion, a fixed-side hole portion formed in the fixed-side die body portion, and a fixed-side cavity constituent member housed in the fixed-side hole portion. The movable-side die has a movable-side die body portion, a movable-side hole portion formed in the movable-side die body portion, and a movable-side core constituent member housed in the movable-side hole portion. The fixed-side cavity constituent member and the movable-side core constituent member form a cavity into which a resin molded product is injection molded. The fixed-side cavity component has a cavity product part housed in the fixed-side hole part and a nozzle part disposed inside the cavity product part. The movable-side core component has a core product part housed in the movable-side hole part and a core product part disposed inside the core product part. The nozzle part has a first nozzle part, a second nozzle part, and a spacer part connecting the first nozzle part and the second nozzle part. The length of the nozzle part can be adjusted by changing the length of the spacer part.

Effects of the Invention

[0024] According to the present invention, it is possible to provide a resin molding die that can ensure ease of maintenance and the like while forming a structure for a plurality of cavities.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same members are basically denoted by the same reference numerals, and repeated descriptions are omitted.

[0034] FIG. 1 is a perspective view showing a resin molding die 10. Here, in the left-right direction, the fixed die 11 and the movable die 12 constituting the resin molding die 10 are shown separated from each other.

[0035] Referring to FIG. 1, the resin molding die 10 is a die that performs multi-cavity molding using a hot runner, and includes a fixed die 11 and a movable die 12. Inside the resin molding die 10, a hot runner (not shown here) is formed, and the configuration of this hot runner will be described later. The resin molding die 10 can manufacture, for example, a large number of resin molded products, about several hundred, by one injection molding. Specifically, the resin molding die 10 can manufacture 21 (7 rows and 3 columns) to 405 (27 rows and 15 columns) resin molded products by one injection molding.

[0036] The fixed die 11 is configured by fastening a plurality of metal plate-like members with fastening means (not shown here). Inside the fixed die 11, a hot runner for flowing molten resin is formed. Also, members constituting a block 29 described later are disposed inside the fixed die 11. The fixed die 11 is fixed to the fixed mounting plate of the mold mounting device of an injection molding machine (not shown here). Here, since a hot runner is formed inside the fixed die 11, it may also be referred to as a hot runner device.

[0037] Similar to the fixed die 11, the movable die 12 is configured by fastening a plurality of metal plate-like members with fastening means (not shown here). Inside the movable die 12, members constituting a block 29 described later are disposed. The movable die 12 is fixed to the movable mounting plate of the mold mounting device of an injection molding machine (not shown here).

[0038] When performing injection molding using the resin molding die 10, the fixed die 11 and the movable die 12 are combined by an injection molding machine, and a large number of cavities 13 described later are formed between the fixed die 11 and the movable die 12.

[0039] FIG. 2 is a perspective view partially showing the fixed die 11 and the movable die 12. FIG. 3 is a perspective view showing the fixed die 11 and the movable die 12 from another angle.

[0040] Referring to FIG. 2, the fixed die 11 has a fixed die body portion 111 and a manifold 20. As shown in FIG. 3, the fixed die body portion 111 has a large number of fixed holes 112 formed in a matrix. The fixed holes 112 are substantially cylindrical holes penetrating the fixed die body portion 111, and a block 29 described later is partially accommodated therein. The manifold 20 is composed of a plurality of laminated plate-like metal plates, and passages for flowing molten resin are formed inside. Here, the fixed die body portion 111 is also referred to as a movable-side sesame body.

[0041] The movable die 12 has a movable die body portion 121 which is a core body. The movable die body portion 121 is a plate-like metal plate constituting the movable die 12, and a large number of movable holes 122 are formed in a matrix. The positions and numbers of the movable holes 122 exactly correspond to the fixed holes 112 formed in the fixed die body portion 111 shown in FIG. 3.

[0042] FIG. 4 is an exploded perspective view showing the manifold 20. Further, FIG. 5 is an exploded perspective view showing the manifold 20 from another angle.

[0043] The manifold 20 has a first manifold plate portion 201, a second manifold plate portion 202, a third manifold plate portion 203, and a fourth manifold plate portion 204 from the right side. These plate portions are fastened by fastening means not shown here. Here, the fourth manifold plate portion 204 is also referred to as a fixed-side body.

[0044] As shown in FIG. 4, a hole 205 penetrating the first manifold plate portion 201 is formed at a substantially central portion of the first manifold plate portion 201. Further, as shown in FIG. 5, the left main surface of the first manifold plate portion 201 is a flat surface.

[0045] Referring to FIG. 4, a hole portion 206, which is a bottomed hole, is formed at a substantially central portion of the right main surface of the second manifold plate portion 202. The position of the hole portion 206 of the second manifold plate portion 202 overlaps with the position of the hole portion 205 of the first manifold plate portion 201. Further, a groove portion 207 is formed on the right main surface of the second manifold plate portion 202. The groove portion 207 is a portion where the right main surface of the second manifold plate portion 202 is recessed in a groove shape, is connected to the hole portion 206, and extends along the periphery. A hole portion 208 is formed at the outer end portion of the groove portion 207. The hole portion 208 is a through hole that penetrates the second manifold plate portion 202. Also, as shown in FIG. 5, the left main surface of the second manifold plate portion 202 is a flat surface.

[0046] Referring to FIG. 4, a recessed portion 209 is formed by recessing the right main surface of the third manifold plate portion 203. The recessed portion 209 is formed as a rectangular region in most of the right main surface of the third manifold plate portion 203 excluding the peripheral edge portion. Referring to FIG. 5, a recessed portion 2012 is formed by recessing the left main surface of the third manifold plate portion 203. The shape and size of the recessed portion 2012 are the same as those of the recessed portion 209 shown in FIG. 4. The hole portion 2010 penetrates through the portion of the third manifold plate portion 203 where the recessed portion 209 and the recessed portion 2012 are formed. A large number of hole portions 2010 are formed in a matrix.

[0047] As shown in FIG. 4, the right main surface of the fourth manifold plate portion 204 is a flat surface, and referring to FIG. 5, the left main surface of the fourth manifold plate portion 204 is a flat surface. Further, a hole portion 2011 that penetrates the fourth manifold plate portion 204 is formed, and the position and number of the hole portions 2011 correspond to those of the hole portions 2010 of the third manifold plate portion 203.

[0048] FIG. 6 is a cross-sectional view showing the resin molding die 10, corresponding to the cutting plane line A-A in FIG. 1. Here, only the portion related to the flow path of the molten resin among the members constituting the resin molding die 10 is shown. Further, here, the flow of the molten resin 30 is indicated by arrows. Also, here, the block 29 is shown in a simplified manner, and the details of the block 29 will be described later with reference to FIGS. 7 and 8. Further, in FIG. 6, the fixed die 11 and the movable die 12 constituting the resin molding die 10 are shown in close contact with each other.

[0049] In the resin molding die 10, the flow of the molten resin first has the molten resin 30 flowing into the hole 205 of the first manifold plate portion 201. Next, the molten resin 30 branches off along the groove 207 of the second manifold plate portion 202 and flows into the recess 209 of the third manifold plate portion 203 through a plurality of holes 208. Further, the molten resin 30 spreads evenly in the recess 209 so that the pressure of the molten resin 30 becomes uniform. Thereafter, the molten resin 30 flows into the recess 2012 via the hole 2010, spreads evenly in the recess 2012, and the pressure of the molten resin 30 becomes even more uniform. Thereafter, the molten resin 30 flows into the block 29 via the hole 2011 of the fourth manifold plate portion 204 to form a resin molded product 31, which will be described later.

[0050] FIG. 7 is an exploded perspective view showing the block 29. In FIG. 7, the central axis of the block 29 is indicated by a dashed line.

[0051] The block 29 has a fixed-side cavity constituting member 113 and a movable-side core constituting member 123 from the right side. The fixed-side cavity constituting member 113 is a portion to be incorporated into the above-described fixed die 11, and the movable-side core constituting member 123 is a portion to be incorporated into the above-described movable die 12.

[0052] The fixed-side cavity constituting member 113 has a nozzle portion 17 and a cavity product portion 14 from the right side. The left portion of the nozzle portion 17 is inserted into the cavity product portion 14.

[0053] The nozzle part 17 is a generally cylindrical member with a porous left side, and includes a first nozzle part 171, a spacer part 173, and a second nozzle part 172. The first nozzle part 171 is a generally cylindrical member and has a first nozzle small diameter part 1711 and a first nozzle large diameter part 1712. The second nozzle part 172 is a generally cylindrical member and has a second nozzle small diameter part 1721 and a second nozzle large diameter part 1722. The spacer part 173 is a generally cylindrical member and is housed inside the first nozzle large diameter part 1712 of the first nozzle part 171 and the second nozzle small diameter part 1721 of the second nozzle part 172. The spacer part 173 has a function of connecting the first nozzle part 171 and the second nozzle part 172.

[0054] The cavity product part 14 is a generally cylindrical member and has a cavity product end face 141, a cavity product small diameter part 142, and a cavity product large diameter part 143.

[0055] The movable side core component 123 has, from the right side, a core product part 15 and a cavity product part 16. The core product part 15 is a generally cylindrical member and has a core product large diameter part 151, a core product small diameter part 152, and a core product end face 153. The cavity product part 16 is a generally cylindrical member and has a cavity product large diameter part 161, a cavity product middle diameter part 162, a cavity product small diameter part 163, and a cavity product end face 164. The cavity product small diameter part 163 of the cavity product part 16 is inserted inside the core product part 15.

[0056] The aforementioned cavity 13 is formed as a space surrounded by the cavity product end face 164, the core product end face 153, and the cavity product end face 141.

[0057] The ejector pin 22 is a member made of a generally rod-shaped metal, and its right end is disposed inside the cavity product part 16. The ejector pin 22 has a function of separating the resin molded product injection molded inside the cavity 13 from the core product end face 153 of the core product part 15 by moving rightward after injection molding.

[0058] FIG. 8 is a cross-sectional view showing an enlarged view of the main part of the resin molding die 10, that is, one block 29 and its vicinity.

[0059] As described above, the movable side core component 123 of the block 29 is arranged on the movable side die 12 side (the movable side hole 122 shown in FIG. 2), and the fixed side cavity component 113 of the block 29 is arranged on the fixed side die 11 side (the fixed side hole 112 shown in FIG. 3).

[0060] A heat insulating part 21 is arranged on the left side of the fixed side die main body part 111. The heat insulating part 21 is made of a plate-like material having a lower thermal conductivity than the fixed side die main body part 111 and the block 29, and has a thickness capable of insulating the nozzle part 17 and the cavity product part 14.

[0061] Furthermore, the outer peripheral surface of the nozzle part 17 and the inner peripheral surface of the cavity product part 14 are separated from each other, and a gap 18 is formed therebetween. That is, the air existing between the nozzle part 17 and the cavity product part 14 functions like a heat insulating material.

[0062] Furthermore, the nozzle part 17 is thermally coupled to the manifold 20, which is a heating part, via the fixed side die main body part 111 described above. That is, the manifold 20, the fixed side die main body part 111, and the nozzle part 17 are made of a metal that is a good heat conductor and are in surface contact with each other to improve heat conduction. With such a configuration, the nozzle part 17 is sufficiently heated during injection molding.

[0063] A method of injection molding using the resin molding die 10 having the above-described configuration will be described. First, referring to FIG. 1, the movable side die 12 is moved rightward by an injection molding machine (not shown) to bring the right surface of the movable side die 12 into contact with the left surface of the fixed side die 11. At this time, the manifold 20 is heated to a sufficiently high temperature so that the resin molded product 31 described later has a certain viscosity.

[0064] Doing so, as shown in FIG. 8, in each block 29, the peripheral edge of the neutron product end face 153 of the neutron product part 15 abuts against the peripheral edge of the cavity product end face 141 of the cavity product part 14. Thereby, a cavity 13 conforming to the product shape is formed. The cavity 13 is formed at the boundary between the fixed-side mold 11 and the movable-side mold 12, and is a space surrounded by the core product end face 164, the neutron product end face 153, and the cavity product end face 141.

[0065] Next, referring to FIG. 6, a molten resin 30 made of a resin melted by an injection molding machine is pumped into the resin molding die 10. The molten resin 30 passes through a passage formed inside the manifold 20 of the resin molding die 10 and is sent to each block 29. The passage of the molten resin 30 inside the manifold 20 is as described above with reference to FIG. 6.

[0066] Next, referring to FIG. 9(A), the molten resin 30 passes through a hot runner formed inside the nozzle portion 17 and is filled into the cavity 13. When the molten resin 30 filled in the cavity 13 hardens, a resin molded product 31 is formed.

[0067] Next, referring to FIG. 9(B), when the resin molded product 31 is formed, the movable-side mold 12 is moved to the left side to separate the movable-side core component 123 from the fixed-side cavity component 113. At this time, the resin molded product 31 is detached from the fixed-side cavity component 113 and adheres to the movable-side core component 123 side. Then, by protruding the push pin 22 toward the right, the resin molded product 31 is detached from the movable-side core component 123.

[0068] Such a process is performed simultaneously for several hundreds of blocks 29 formed in the resin molding die 10.

[0069] According to the above-described embodiment, the following main effects can be achieved.

[0070] First, referring to FIG. 8, by forming a cavity 13 in which a resin molded product is injection molded with a fixed-side cavity component 113 and a movable-side core component 123, a number of cavities 13 corresponding to the shape of the resin molded product to be manufactured can be formed in the resin mold 10. Specifically, the members constituting the block 29 shown in FIG. 7 are accommodated in the movable-side hole 122 of the movable-side mold body 121 shown in FIG. 2 and the fixed-side hole 112 of the fixed-side mold body 111 shown in FIG. 3. Therefore, according to the shape of the resin molded product 31 to be manufactured, the shape of the block 29 can be changed, eliminating the need for machining the movable-side mold body 121 and the fixed-side mold body 111. Further, since the block 29 is composed of a plurality of members, the gas generated during injection molding can be released through the block 29. Thus, it is possible to suppress the occurrence of a short shot where the molten resin 30 does not spread sufficiently, and further suppress the occurrence of gas burns.

[0071] Furthermore, referring to FIG. 7, the length of the spacer portion 173 along the left-right direction can be changed. Specifically, if the resin molded product 31 to be formed has a thick wall, the spacer portion 173 is shortened. Thereby, the cavity 13 can be thickened. On the other hand, if the resin molded product 31 has a thin wall, the spacer portion 173 is lengthened. Thereby, the cavity 13 can be thinned. By doing so, by changing the length of the spacer portion 173, it is possible to easily cope with changes in the shape of the resin molded product 31 and reduce the manufacturing cost.

[0072] Furthermore, referring to FIG. 8, by forming a gap 18 between the nozzle portion 17 and the cavity product portion 14, the nozzle portion 17 and the cavity product portion 14 can be thermally insulated, suppressing the resin inside the nozzle portion 17 from being cooled. Thus, as shown in FIG. 9(A), during injection molding, the molten resin 30 can flow well inside the nozzle portion 17, and the cavity 13 can be reliably filled with the molten resin 30.

[0073] Furthermore, referring to FIG. 8, by making the nozzle portion 17, which was conventionally integrated with the mold, into a separate part, the inner diameter, shape, etc. of the nozzle portion 17 can be individually created with high precision. Also, even when a large number of nozzle portions 17 are created, those of good quality can be selected and used. Therefore, the quality of the resin molded product 31 manufactured using the resin molding die 10 can be improved.

[0074] Furthermore, referring to FIG. 8, by disposing a heat insulating portion 21 between the nozzle portion 17 and the fixed-side mold body portion 111, inadvertent heat exchange between the nozzle portion 17 and the cavity product portion 14 can be suppressed, cooling of the nozzle portion 17 can be suppressed, and the molten resin 30 can be made to flow well inside the nozzle device.

[0075] As described above, the embodiments of the present invention have been explained, but the present invention is not limited thereto, and can be modified without departing from the gist of the present invention. Also, the above-described embodiments can be combined with each other.

[0076] For example, referring to FIG. 7, as the spacer portion 173, a substantially columnar metal member that functions as a dummy can be adopted. By doing so, the spacer portion 173 prevents the molten resin from passing through. Therefore, by not performing injection molding in the block 29 in which the spacer portion 173 having such a configuration is incorporated, the number of resin molded products 31 manufactured by the fixed-side mold 11 can be adjusted.

[0077] Also, referring to FIG. 8, the block 29 includes the core product portion 15 as an intermediate member, but when the shape of the resin molded product 31 to be manufactured is simple, the block 29 can be configured by omitting the core product portion 15. The invention grasped from the above-described embodiments will be described below together with its effects. The resin molding die of the present invention is a resin molding die that performs multi-cavity molding using a hot runner, and includes a fixed-side die and a movable-side die. The fixed-side die has a fixed-side die main body part, a fixed-side hole part formed in the fixed-side die main body part, and a fixed-side cavity component housed in the fixed-side hole part. The movable-side die has a movable-side die main body part, a movable-side hole part formed in the movable-side die main body part, and a movable-side core component housed in the movable-side hole part. The fixed-side cavity component and the movable-side core component are characterized by forming a cavity into which a resin molded product is injection molded. Therefore, according to the resin molding die of the present invention, by forming a cavity into which a resin molded product is injection molded by the fixed-side cavity component and the movable-side core component, a plurality of cavities corresponding to the shape of the resin molded product to be manufactured can be formed in the resin molding die. In addition, in the resin molding die of the present invention, the fixed-side cavity constituent member has a cavity product part housed in the fixed-side hole part and a nozzle part disposed inside the cavity product part, and the movable-side core constituent member has a core pin product part housed in the movable-side hole part and a core product part disposed inside the core pin product part. Therefore, according to the resin molding die of the present invention, since the fixed-side cavity constituent member and the movable-side core constituent member are composed of various product parts, even if the shape of the resin molded product to be manufactured is changed, it is possible to cope by changing the various product parts in accordance with the shape of the new product. In addition, in the resin molding die of the present invention, the nozzle part has a first nozzle part, a second nozzle part, and a spacer part connecting the first nozzle part and the second nozzle part, and the length of the nozzle part can be adjusted by changing the length of the spacer part. Therefore, according to the resin molding die of the present invention, by adjusting the length of the nozzle part, the position in the axial direction of the cavity product part can be adjusted, and it is possible to cope with the change in the shape of the cavity. Furthermore, by blocking the inside of the spacer, the resin can be stopped, and it is also possible to handle defects, change the shape, and adjust the quantity. In addition, in the resin molding die of the present invention, a gap is formed between the outer peripheral surface of the nozzle part and the inner peripheral surface of the cavity product part. Therefore, according to the resin molding die of the present invention, since a gap is formed between the nozzle part and the cavity product part, the nozzle part can be thermally insulated from the outside thereof, and it is possible to suppress the resin from being at a low temperature inside the nozzle part. In addition, the resin molding die of the present invention is a resin molding die that performs multiple-piece molding using a hot runner, and includes a fixed-side die and a movable-side die. The fixed-side die has a fixed-side die body portion, a fixed-side hole portion formed in the fixed-side die body portion, a nozzle portion housed in the fixed-side hole portion, and a heating portion adjacent to the fixed-side die body portion. The movable-side die has a movable-side die body portion, and the nozzle portion is thermally coupled to the heating portion. Therefore, according to the resin molding die of the present invention, by making the nozzle portion, which was conventionally integrated with the die, into a separate part, the inner diameter, shape, etc. of the nozzle portion can be individually created with high precision. Also, even when a large number of nozzle portions are created, those of good quality can be selected and used. Thus, the quality of the resin molded product manufactured using the resin molding die can be improved. In addition, in the resin molding die of the present invention, the heating portion is characterized by being a manifold. Therefore, according to the resin molding die of the present invention, the nozzle can be effectively heated by the manifold. In addition, in the resin molding die of the present invention, a heat insulation portion is arranged between the nozzle portion and the fixed-side die body portion. Therefore, according to the resin molding die of the present invention, by arranging a heat insulation portion between the nozzle portion and the cavity product portion, inadvertent heat exchange between the nozzle portion and the cavity product portion is suppressed, cooling of the nozzle portion is suppressed, and molten resin can flow well inside the nozzle portion. In addition, in the resin molding die of the present invention, a gap is formed between the nozzle portion and the fixed-side die body portion. Therefore, according to the resin molding die of the present invention, by forming a gap between the nozzle portion and the cavity product portion, inadvertent heat exchange between the nozzle portion and the cavity product portion is suppressed, cooling of the nozzle portion is suppressed, and molten resin can flow well inside the nozzle device.

Explanation of Symbols

[0078] 10 Resin Mold 11 Fixed Mold 111 Fixed Mold Body 112 Fixed Hole 113 Fixed Cavity Component 12 Movable Mold 121 Movable Mold Body 122 Movable Hole 123 Movable Core Component 13 Cavity 14 Cavity Product 141 Cavity Product End Face 142 Cavity Product Small Diameter Part 143 Cavity Product Large Diameter Part 15 Core Product 151 Core Product Large Diameter Part 152 Core Product Small Diameter Part 153 Core Product End Face 16 Core Product 161 Core Product Large Diameter Part 162 Core Product Medium Diameter Part 163 Core Product Small Diameter Part 164 Core Product End Face 17 Nozzle 171 First Nozzle 1711 First Nozzle Small Diameter Part 1712 First Nozzle Large Diameter Part 172 Second Nozzle 1721 Second Nozzle Small Diameter Part 1722 Second Nozzle Large Diameter Part 173 Spacer 18 Gap 20 Manifold 201 First Manifold Plate 202 Second Manifold Plate 203 Third Manifold Plate 204 Fourth Manifold Plate 205 Hole part 206 Hole part 207 Groove part 208 Hole part 209 Concave part 2010 Hole part 2011 Hole part 2012 Concave part 21 Heat insulation part 22 Extrusion pin 29 Block 30 Melted resin 31 Resin molded product 500 Injection molding device 501 Manifold 502 Heat insulation plate 503 Cavity body 504 Cavity block 505 Core plate 506 Core block 507 Bolt 508 Bolt 509 Cavity 510 Extrusion pin 511 Nozzle 520 Injection molding device 521 Manifold 522 Heat insulation plate 523 Cavity body 524 Concave part 525 Core plate 526 Core block 527 Cavity 528 Extrusion pin 529 Nozzle

Claims

1. A resin molding die for performing multiple takings using a hot runner, comprising a fixed die and a movable die, wherein the fixed die has a fixed die main body portion, a fixed side hole portion formed in the fixed die main body portion, and a fixed side cavity constituent member housed in the fixed side hole portion, the movable die has a movable die main body portion, a movable side hole portion formed in the movable die main body portion, and a movable side core constituent member housed in the movable side hole portion, the fixed side cavity constituent member and the movable side core constituent member form a cavity into which a resin molded product is injection molded, the fixed side cavity constituent member has a cavity product portion housed in the fixed side hole portion and a nozzle portion disposed inside the cavity product portion, the movable side core constituent member has a core pin product portion housed in the movable side hole portion and a core product portion disposed inside the core pin product portion, the nozzle portion has a first nozzle portion, a second nozzle portion, and a spacer portion connecting the first nozzle portion and the second nozzle portion, A resin molding die characterized in that the length of the nozzle portion can be adjusted by changing the length of the spacer portion.

2. The resin molding die according to claim 1, wherein a gap is formed between the outer peripheral surface of the nozzle portion and the inner peripheral surface of the cavity product portion.

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