Mold and method for manufacturing component using mold

Abstract

To realize a structure having a non-linear cylindrical hole inside by using a mold.SOLUTION: A mold comprises a fixed mold and a movable mold. The movable mold has an arcuate shape and a slide core that is movable in an arcuate manner. The slide core is integrally formed with an arcuate rod-shaped member.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a mold and a method for manufacturing a part using the mold. [Background technology]

[0002] Molds are widely used in the molding process of plastic products and resin products. Patent Document 1 shows an example of a mold. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-179870 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the structures of plastic and resin products molded using molds have become increasingly complex. As a result, the demands on molds are becoming more sophisticated, allowing for the production of structures that were previously impossible to manufacture using conventional molds.

[0005] An example of a complex structure is a plastic product that has an undercut shape, i.e., a portion that cannot be released from the mold, using a normal mold structure. For example, when attempting to mold such a structure using a mold such as that disclosed in Patent Document 1, a new problem was discovered: the undercut shape cannot be released by normal (linear) movement in the mold. An example of such a product is a hearing aid. In order to fit the hearing aid to the human ear, its shape needs to have a structure with a non-linear cylindrical hole inside.

[0006] Therefore, the object of the present invention is to make it possible to realize a structure having a non-linear cylindrical hole inside using a mold, and to provide a mold for this purpose and a method for producing parts using the mold. [Means for solving the problem]

[0007] An example of the mold of the present invention for solving the above problems is as follows.

[0008] A mold having a fixed-side mold and a movable-side mold, wherein the movable-side mold has an arc-shaped slide core that is movable in an arc-like manner, and an arc-shaped rod-shaped member is integrally formed with the slide core. [Effects of the Invention]

[0009] According to the mold of the present invention, it is possible to manufacture a structure having a non-linear cylindrical hole therein.

[0010] Further means and effects of the present invention will become apparent throughout the entire specification below. [Brief explanation of the drawings]

[0011] [Figure 1A] 1 is a top perspective view of an object to be manufactured using a mold according to the present invention. [Figure 1B] FIG. 2 is a side perspective view of an object manufactured by the mold of the present invention. [Figure 1C] FIG. 2 is a front perspective view of an object manufactured by the mold of the present invention. [Figure 2] FIG. 2 is a perspective view of a fixed mold according to the present invention. [Figure 3] FIG. 2 is a perspective view of a movable mold according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings as needed. [Example]

[0013] FIG. 1 shows an example of a plastic molded part that can be manufactured using the mold of the present invention. FIG. 1A is a top perspective view, FIG. 1B is a side perspective view, and FIG. 1C is a front perspective view. The assumed product 1 has a fill portion 10 and a hole portion 11. The fill portion itself is curved in an arc-like curve, and therefore the internal hole portion is also curved in an arc-like curve. One example of an assumed application is a resin part for an in-ear insertion hearing aid. As can be seen from FIG. 1, because the hole portion is curved, it would be difficult to manufacture using a conventional mold consisting of straight parts.

[0014] Figure 2 shows a perspective view of the fixed mold 100 of the present invention, and Figure 3 shows a perspective view of the movable mold 101 of the present invention. These are views divided at the parting surface. While patent drawings typically use perspective views as reference, this invention considers three-dimensional composition to be an important element of the invention, and since the structure is difficult to understand without a perspective view, we have deliberately used a perspective view to explain the structure. Furthermore, the fixed mold in this invention does not have a special operating mechanism compared to the movable mold, and mold separation at the parting surface is a natural function of the mold.

[0015] In Fig. 2, the angular cam 2 has a long rod-like shape, but is characterized by having a three-dimensional twisted shape. Around the angular cam 2 of the fixed mold 100, the slide core moving part 20 is configured as a fan-shaped recess by cutting the fixed mold 100. Resin is poured into this area to form the product shape part 6, which becomes part of the product shape shown in Fig. 1.

[0016] The fixed mold 100 in Fig. 2 is turned upside down and mated with the movable mold in Fig. 3. During resin molding, the molds in Fig. 2 and 3 come into close contact with each other at their parting surfaces.

[0017] The movable die 101 in Figure 3 will be described. It has a slide core 4, which is structured to be able to move in an arc. A part of the slide core 4 has a slide core oblique hole 5. This oblique hole penetrates the slide core member. 50 is an angular cam recess hole. When Figure 2 is turned upside down and fitted to Figure 3, the angular cam 2 is inserted into the slide core oblique hole 5 and further protrudes into the angular cam recess hole 50. An arc-shaped recess is formed in the movable die so that the slide core 4 can move in an arc. Slide core guides 60 are provided on both sides of the inner surface of the recess to facilitate the arc-shaped movement of the slide core 4.

[0018] The movable mold 101 also has a product shaping portion 6, as in the case of the fixed mold 100 in Fig. 2. What differs from the case in Fig. 2 is that it has a hole-forming rod-shaped member 7 for the purpose of forming a hole portion of the intended product 1, that is, for the purpose of removing the resin to form the hole portion 11 of the intended product 1 when resin is poured into the product shaping portion 6 to form the solid portion 10 of the intended product 1. This hole-forming rod-shaped member also has an arc-like shape. Furthermore, this hole-forming rod-shaped member 7 is configured integrally with the slide core 4.

[0019] The manufacturing process of the assumed product 1 using the fixed mold 100 and the movable mold 101 in the present invention will be described.

[0020] First, the fixed mold 100 and the movable mold 101 are fitted together. The fixed mold in Fig. 2 is turned upside down and brought into close contact with the movable mold in Fig. 3. As a result, the product shape portion 6 is formed as a cavity, and a rod-shaped member 7 for forming a hole is placed in the center of the cavity.

[0021] Next, resin is poured into the product shape portion 6. Note that a resin introduction path for pouring resin is formed somewhere in the mold, but since this is a basic premise for resin molding using a mold, it will not be specifically illustrated or explained in detail.

[0022] When the poured resin hardens, a resin structure having the shape of the product shown in FIG.

[0023] After this, it is necessary to remove the intended product 1 from the mold. The mold described in Patent Document 1 can only move in a linear manner, so when removing the intended product 1 from the mold, a strong force is applied to the hole in the intended product 1, causing the hole in the intended product to break or causing a crack in the intended product from the hole. For this reason, there was a problem that it was difficult to manufacture a shape like the intended product 1 with a conventional mold that only moves in a linear manner.

[0024] The present invention solves this problem and makes it possible to manufacture the hypothetical product 1.

[0025] In the movable mold 101 of the present invention, the slide core 4 is capable of moving in an arc shape, and the arc-shaped hole-forming rod member 7 formed integrally with the slide core 4 is also capable of moving in an arc shape.

[0026] As a result, for example, after removing the fixed mold 100, by using the movable mold 101 to move the slide core 4 in an arc shape and away from the product shape portion 6, the hole-forming rod member 7 is also pulled out in an arc shape. Therefore, it is possible to pull out the hole-forming rod member 7 from the molded intended product 1 without applying extra force to the hole portion of the intended product. In other words, this can be said to be a mold structure that can eliminate undercut portions, and a method for manufacturing a part using this mold.

[0027] Even at this stage, the present invention has the remarkable effect of making it possible to manufacture products that could not be manufactured using conventional linear motion die structures.

[0028] This effect is realized mainly by the fact that the slide core 4 is movable in an arc shape in the movable die 101 and has an arc-shaped rod-like member 7 for forming a hole that is formed integrally with the slide core 4. Therefore, this embodiment also includes the case where the angular cam 2 in the fixed die 100 is a simple rod-like member. [Example]

[0029] This example explains an additional effect of Example 1. The difference between this example and Example 1 is that the angular cam 2 of the fixed die 100 in Fig. 2 has a three-dimensional twisted shape.

[0030] As in Example 1, the fixed mold 100 and the movable mold 101 are fitted together. After pouring and curing the resin, the fixed mold 100 and the movable mold 101 are separated.

[0031] At this time, the shape of the angular cam 2 in this embodiment is a three-dimensional twisted shape. For this reason, when the fixed-side mold 100 is gradually pulled away from the movable-side mold 101 in an attempt to separate the fixed-side mold 100 from the movable-side mold 101, the angular cam 2 gradually moves in the oblique hole 5 of the slide core of the movable-side mold 101. At this time, because the hole of the slide core is not simply linear but is an oblique hole, a lateral force is applied to the slide core 4 as the angular cam 2 moves, and it is possible to impart lateral movement.

[0032] In this case, if the shape of the angular cam 2 is linear, the movement can only be realized in a linear manner. Therefore, in the present invention, the shape of the angular cam 2 is made three-dimensionally twisted, so that the movement of the angular cam 2 can be made to be an arc-like movement.

[0033] This means that the arcuate movement of the slide core 4 in the movable mold 101 can be achieved simply by the mold separation operation itself, without providing a separate drive mechanism such as a motor. This simplifies the mold structure, is simple, and does not require additional power consumption, making it possible to achieve an environmentally friendly molding method.

[0034] In this case, the hole shape of the slide core 4 and the three-dimensional twisted shape of the angular cam 2 can be appropriately designed for the shape of the assumed product 1 by using general design tools such as 3D-CAD.

[0035] Furthermore, the three-dimensional twisted shape of the angular cam and the hole in the slide core can be set according to the size of the arc, making it possible to apply it to a variety of arc sizes.

[0036] Depending on the design, it can accommodate a wide variety of sizes and structures. [Example]

[0037] This embodiment is basically the same as embodiment 2. The difference is that in this embodiment, the hardness of the angular cam 2 is lower than that of the slide core 4. This allows the wear of the movable die, which has a complex structure, to be lower than that of the fixed die, which has a relatively simple structure, thereby improving repair and maintenance. However, it is preferable that the material of the angular cam 2 also has high toughness.

[0038] Furthermore, with regard to hardness, from the viewpoint of long-term durability and cost, it is desirable to set the hardness in the following order: slide core guide 60 > slide core 4 > angular cam 2, or to select materials that satisfy this relationship.

[0039] In the above examples, the technical concept of the present invention has been explained with a focus on the mold structure. The mold apparatus, molding apparatus, and part manufacturing method to which the technical concept is applied are also included within the scope of the disclosure and claims of the present invention.

[0040] The above examples illustrate the ideas and concepts of the present invention. Of course, examples realized by combining the examples are also included within the scope of the present invention. Furthermore, as long as the disclosed ideas and concepts are used, modifications and similar examples are also included within the scope of the present invention.

[0041] Furthermore, one example of the present invention described using the above embodiments can also be expressed as follows.

[0042] <Part 1> In a mold having a fixed mold and a movable mold, The movable mold has an arc-shaped slide core that is movable in an arc-like manner, and an arc-shaped rod-shaped member is integrally formed with the slide core.

[0043] <Part 2> In the mold described in <No. 1>, The fixed die has an angular cam, The slide core has a hole for fitting the angular cam, The hole for fitting the angular cam has an oblique shape, and the angular cam is made of a mold having a three-dimensional twisted shape.

[0044] <Part 3> In the mold described in <No. 2>, A mold that imparts an arcuate movement to the slide core when the angular cam moves through the angular cam fitting hole.

[0045] <Part 4> In the mold described in <No. 3>, A mold in which the hardness of the angular cam is lower than the hardness of the slide core.

[0046] <Part 5> In a mold device having a fixed mold and a movable mold, The movable mold has an arc-shaped slide core that is movable in an arc-like manner, and the slide core is integrally formed with an arc-shaped rod-shaped member.

[0047] <Part 6> In the mold device described in <Item 5>, The fixed die has an angular cam, The slide core has a hole for fitting the angular cam, The hole for fitting the angular cam has an oblique shape, and the angular cam has a three-dimensional twisted shape.

[0048] <Part 7> In the mold device described in <Item 6>, A die device that imparts an arcuate movement to the slide core when the angular cam moves through the angular cam fitting hole.

[0049] <Part 8> In the mold device described in <No. 7>, A mold device in which the hardness of the angular cam is lower than the hardness of the slide core.

[0050] <No. 9> In a molding apparatus having a fixed mold and a movable mold, The movable mold has an arc-shaped slide core that is movable in an arc-like manner, and the slide core is integrally formed with an arc-shaped rod-like member.

[0051] <Part 10> In the molding apparatus according to <Item 9>, The fixed die has an angular cam, The slide core has a hole for fitting the angular cam, The hole for fitting the angular cam has an oblique shape, and the angular cam has a three-dimensional twisted shape.

[0052] <Part 11> In the molding apparatus according to <Item 10>, A molding device that imparts an arcuate movement to the slide core when the angular cam moves through the angular cam fitting hole.

[0053] <Part 12> In the mold device described in <Item 11>, A molding device in which the hardness of the angular cam is lower than the hardness of the slide core.

[0054] <Part 13> A method for manufacturing parts, in which plastic or resin is molded using a mold described in any one of <Items 1> to <Item 4>, a mold device described in any one of <Items 5> to <Item 8>, or a molding device described in any one of <Items 9> to <Item 12>.

[0055] <Part 14> <Item 13> A method for manufacturing a part according to the present invention, wherein the manufactured part has an arc-shaped hole. [Explanation of symbols]

[0056] 1: Expected product 2: Angular Cam 4: Slide core 5: Oblique hole in slide core 6:Product shape part 7: Rod-shaped member for forming holes 10: Meat part 11: Hole 20: Slide core moving part 50: Angular Cam Immersion Hole 60: Slide core guide 100: Fixed side mold 101: Movable mold

Claims

1. In a mold having a fixed mold and a movable mold, The movable mold has an arc-shaped slide core that is movable in an arc-like manner, and an arc-shaped rod-shaped member is integrally formed with the slide core.

2. The mold according to claim 1, The fixed die has an angular cam, The slide core has a hole for fitting the angular cam, The hole for fitting the angular cam has an oblique shape, and the angular cam has a mold having a three-dimensional twisted shape.

3. The mold according to claim 2, A mold that imparts an arcuate movement to the slide core when the angular cam moves through the angular cam fitting hole.

4. The mold according to claim 3, A mold in which the hardness of the angular cam is lower than the hardness of the slide core.

5. In a mold device having a fixed mold and a movable mold, The movable mold has an arc-shaped slide core that is movable in an arc-like manner, and the slide core is integrally formed with an arc-shaped rod-shaped member.

6. The mold device according to claim 5, The fixed die has an angular cam, The slide core has a hole for fitting the angular cam, A mold device in which the hole for fitting the angular cam has an oblique shape, and the angular cam has a three-dimensional twisted shape.

7. The mold device according to claim 6, A die device that imparts an arcuate movement to the slide core when the angular cam moves through the angular cam fitting hole.

8. The mold apparatus according to claim 7, A mold device in which the hardness of the angular cam is lower than the hardness of the slide core.

9. In a molding apparatus having a fixed mold and a movable mold, The movable mold has an arc-shaped slide core that is movable in an arc-like manner, and the slide core is integrally formed with an arc-shaped rod-like member.

10. 10. The molding apparatus according to claim 9, The fixed die has an angular cam, The slide core has a hole for fitting the angular cam, A forming device in which the hole for fitting the angular cam has an oblique shape, and the angular cam has a three-dimensional twisted shape.

11. The molding apparatus according to claim 10, A molding device that imparts an arcuate movement to the slide core when the angular cam moves through the angular cam fitting hole.

12. The mold apparatus according to claim 11, A molding device in which the hardness of the angular cam is lower than the hardness of the slide core.

13. A method for manufacturing a part, in which plastic or resin is molded using a mold described in any one of claims 1 to 4, a mold device described in any one of claims 5 to 8, or a molding device described in any one of claims 9 to 12.

14. 14. The method for manufacturing a part according to claim 13, wherein the part to be manufactured has an arc-shaped hole.

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