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 more particularly to a resin molding die for multi-cavity molding.

Background Art

[0002] Generally, when performing resin molding with 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 insulating 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 insulating 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 with the above configuration, the molten resin is encapsulated into the cavity 509 from the side of the manifold 501 via the inside of the nozzle 511. After the encapsulated resin hardens, the cavity block 504 and the core block 506 are separated, and further, by protruding the push pin 510 upward, the resin molded product can be taken out.

[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 corresponding to the size of the nozzle can be provided.

[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 insulation plate 522, a cavity 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 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 arranging the bolts 507 and 508 becomes a limitation when increasing the cavity 509.

[0014] Further, 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 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 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 are characterized by forming a cavity in which a resin molded product is injection molded.

[0017] In addition, in the resin molding die of the present invention, the fixed-side cavity component includes 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 component includes a core product part housed in the movable-side hole part and a core product part disposed inside the core product part.

[0018] In addition, in the resin molding die of the present invention, the nozzle part includes a first nozzle part, a second nozzle part, and a spacer part connecting the first nozzle part and the second nozzle part, and means for adjusting the length of the nozzle part by changing the length of the spacer part can also be adopted.

[0019] 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.

[0020] In addition, the resin molding die of the present invention is a resin molding die that performs multiple molding operations using a hot runner, and includes a fixed-side die and a movable-side die. The fixed-side die includes a fixed-side die main body part, a fixed-side hole part formed in the fixed-side die main body part, a nozzle part housed in the fixed-side hole part, and a heating part adjacent to the fixed-side die main body part. The movable-side die has a movable-side die main body part, and the nozzle part is thermally coupled to the heating part.

[0021] In addition, in the resin molding die of the present invention, the heating part is a manifold.

[0022] In addition, in the resin molding die of the present invention, a heat insulating part is disposed between the nozzle part and the fixed-side die main body part.

[0023] In addition, in the resin molding die of the present invention, a gap is formed between the nozzle part and the fixed-side die main body part.

Effects of the Invention

[0024] The resin molding die of the present invention is a resin molding die that performs multiple molding operations using a hot runner, and includes a fixed die and a movable die. 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 component 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 component member housed in the movable side hole portion. The fixed side cavity component member and the movable side core component member 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 member and the movable side core component member, a number of cavities corresponding to the shape of the resin molded product to be manufactured can be formed in the resin molding die.

[0025] Further, in the resin molding die of the present invention, the fixed side cavity component 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 component member is characterized by having a core product portion housed in the movable side hole portion and a core product portion disposed inside the core product portion. Therefore, according to the resin molding die of the present invention, since the fixed side cavity component member and the movable side core component 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 respond by changing the various product parts in accordance with the shape of the new product.

[0026] Further, in the resin molding die of the present invention, 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. By changing the length of the spacer portion, it is also possible to adopt means for adjusting the length of the nozzle portion. Therefore, according to the resin molding die of the present invention, by adjusting the length of the nozzle portion, the position in the axial direction of the cavity product portion can be adjusted, and the change in the shape of the cavity can be dealt with. 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.

[0027] Further, in the resin molding die of the present invention, a gap is formed between the outer peripheral surface of the nozzle portion and the inner peripheral surface of the cavity product 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, heat insulation is provided between the outside of the nozzle portion and the inside of the nozzle portion can be prevented from being cooled to a low temperature.

[0028] Further, the resin molding die of the present invention is a resin molding die that uses a hot runner and has a plurality of nozzles, and includes a fixed die and a movable die. The fixed die includes a fixed die main body portion, a fixed side hole portion formed in the fixed die main body portion, a nozzle portion housed in the fixed side hole portion, and a heating portion adjacent to the fixed die main body portion. The movable die has a movable die main 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 and shape of the nozzle portion can be individually created with high precision. Also, even when a large number of nozzle portions are created, good ones can be selected and used. Therefore, the quality of the resin molded product manufactured using the resin molding die can be improved.

[0029] Further, in the resin molding die of the present invention, the heating portion is a manifold. Therefore, according to the resin molding die of the present invention, the nozzle can be effectively heated by the manifold.

[0030] Further, in the resin molding die of the present invention, a heat insulating portion is disposed between the nozzle portion and the fixed die main body portion. Therefore, according to the resin molding die of the present invention, by disposing a heat insulating portion between the nozzle portion and the cavity product portion, inadvertent heat exchange between the nozzle portion and the cavity product portion can be suppressed, cooling of the nozzle portion can be suppressed, and the molten resin can flow well inside the nozzle portion.

[0031] 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 can be suppressed, cooling of the nozzle portion can be suppressed, and the molten resin can flow well inside the nozzle device.

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

Embodiments 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 - side die 11 and the movable - side die 12 that constitute the resin molding die 10 are shown separated from each other.

[0035] Referring to FIG. 1, the resin molding die 10 is a die for performing multi - cavity molding using a hot runner, and includes a fixed - side die 11 and a movable - side 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, several hundreds of resin molded products by one injection molding. Specifically, the resin molding die 10 can manufacture 21 (7 rows × 3 columns) to 405 (27 rows × 15 columns) resin molded products by one injection molding.

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

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

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

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

[0040] Referring to FIG. 2, the fixed mold 11 has a fixed mold main body portion 111 and a manifold 20. As shown in FIG. 3, a large number of fixed holes 112 are formed in the fixed mold main body portion 111 in a matrix shape. The fixed holes 112 are substantially cylindrical holes penetrating the fixed mold main body portion 111, and the 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 thereof. Here, the fixed mold main body portion 111 is also referred to as a movable sesame main body.

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

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

[0043] The manifold 20 has, from the right side, 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. 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 main body.

[0044] As shown in FIG. 4, a hole portion 205 penetrating the first manifold plate portion 201 is formed at a substantially central portion of the first manifold plate portion 201. Also, 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 approximately the center 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 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 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 portion 2011 correspond to those of the hole portion 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. Also, 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, and 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 and forms the resin molded product 31 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 constituent member 113 and a movable-side core constituent member 123 from the right side. The fixed-side cavity constituent member 113 is a portion incorporated into the aforementioned fixed die 11, and the movable-side core constituent member 123 is a portion incorporated into the aforementioned movable die 12.

[0052] The fixed-side cavity constituent 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 substantially cylindrical member with a porous left side as a whole, and has a first nozzle part 171, a spacer part 173, and a second nozzle part 172. The first nozzle part 171 is a substantially 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 substantially 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 substantially 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 substantially 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 core product part 16. The core product part 15 is a substantially 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 core product part 16 is a substantially cylindrical member and has a core product large-diameter part 161, a core product medium-diameter part 162, a core product small-diameter part 163, and a core product end face 164. The core product small-diameter part 163 of the core product part 16 is inserted inside the core product part 15.

[0056] The cavity 13 described above is formed as a space surrounded by the core 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 substantially rod-shaped metal, and its right end is disposed inside the core 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 essential part of the resin molding die 10, that is, one block 29 and its vicinity, enlarged.

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

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

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

[0062] Furthermore, the nozzle portion 17 is thermally coupled to the manifold 20, which is a heating portion, via the fixed side die main body portion 111 described above. That is, the manifold 20, the fixed side die main body portion 111, and the nozzle portion 17 are made of a metal that is a good heat conductor and are in surface contact with each other to facilitate heat conduction. With such a configuration, the nozzle portion 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) so that the right surface of the movable side die 12 abuts against 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 is sent to each block 29 via a passage formed inside the manifold 20 of the resin molding die 10. 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 is in close contact with 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 on 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 by 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 molding die 10. Specifically, the members constituting the block 29 shown in FIG. 7 are accommodated in the movable-side hole 122 of the movable-side die body 121 shown in FIG. 2 and the fixed-side hole 112 of the fixed-side die 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 of the movable-side die body 121 and the fixed-side die body 111. Also, since the block 29 is composed of a plurality of members, gas generated during injection molding can escape 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 burning.

[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 a change 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 surely 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 to this, and can be changed 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, although the block 29 includes the core product portion 15 as an intermediate member, 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.

Explanation of Reference Numerals

[0078] 10 Resin molding die 11 Fixed-side mold 111 Fixed-side mold body portion 112 Fixed-side hole portion 113 Fixed-side cavity constituent member 12 Movable-side mold 121 Movable-side mold body part 122 Movable-side hole part 123 Movable-side core component 13 Cavity 14 Cavity product part 141 Cavity product end face 142 Cavity product small-diameter part 143 Cavity product large-diameter part 15 Insert product part 151 Insert product large-diameter part 152 Insert product small-diameter part 153 Insert product end face 16 Core product part 161 Core product large-diameter part 162 Core product middle-diameter part 163 Core product small-diameter part 164 Core product end face 17 Nozzle part 171 First nozzle part 1711 First nozzle small-diameter part 1712 First nozzle large-diameter part 172 Second nozzle part 1721 Second nozzle small-diameter part 1722 Second nozzle large-diameter part 173 Spacer part 18 Gap 20 Manifold 201 First manifold plate part 202 Second manifold plate part 203 Third manifold plate part 204 Fourth manifold plate part 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 Molten 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 Portion 525 Core Plate 526 Core Block 527 Cavity 528 Extrusion Pin 529 Nozzle

Claims

1. A resin molding die for performing multiple-shot molding using a hot runner, comprising a fixed die and a movable die, wherein the fixed die has a fixed die body portion, a fixed side hole portion formed in the fixed die body portion, and a fixed side cavity component member housed in the fixed side hole portion, the movable die has a movable die body portion, a movable side hole portion formed in the movable die body portion, and a movable side core component member housed in the movable side hole portion, and the fixed side cavity component member and the movable side core component member form a cavity in which a resin molded product is injection molded. The resin molding die is characterized by this.

2. The fixed side cavity component member has a cavity product portion housed in the fixed side hole portion and a nozzle portion disposed inside the cavity product portion, and the movable side core component member has a core product portion housed in the movable side hole portion and a core product portion disposed inside the core product portion. The resin molding die according to claim 1 is characterized by this.

3. A gap is formed between the outer peripheral surface of the nozzle portion and the inner peripheral surface of the cavity product portion. The resin molding die according to claim 2 is characterized by this.

4. A resin molding die for performing multiple-shot molding using a hot runner, comprising a fixed die and a movable die, wherein the fixed die has a fixed die body portion, a fixed side hole portion formed in the fixed die body portion, a nozzle portion housed in the fixed side hole portion, and a heating portion adjacent to the fixed die body portion, the movable die has a movable die body portion, and the nozzle portion is thermally coupled to the heating portion. The resin molding die is characterized by this.

5. The heating portion is a manifold. The resin molding die according to claim 4 is characterized by this.

6. A heat insulating portion is disposed between the nozzle portion and the fixed die body portion. The resin molding die according to claim 4 or claim 5 is characterized by this.

7. A gap is formed between the nozzle portion and the fixed die body portion. The resin molding die according to claim 4 or claim 5 is characterized by this.

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