Molding die

Abstract

To provide a molding die capable of preventing burr formation.SOLUTION: A molding die 10 includes: a dividing die 12 that includes a sealing section 14 for partitioning a cavity 12a, and is divided in a first direction; and pressing means 16 that presses the sealing section 14 from a second direction intersecting the first direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a molding tool. [Background technology]

[0002] In a molding die, a resin material is injected into a cavity formed between an upper die and a lower die to form a molded product. If the resin material gets into the parting surface where the upper die and the lower die meet, burrs will be generated, so it has been proposed to place a seal made of an elastic material such as rubber on the parting surface (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3486782 Summary of the Invention [Problem to be solved by the invention]

[0004] When a seal is repeatedly molded, it can crack, chip, wear, and become worn, resulting in burrs.

[0005] The present invention has been proposed in view of the above problems associated with the conventional technology, in order to preferably solve these problems, and has an object to provide a molding die capable of preventing the occurrence of burrs. [Means for solving the problem]

[0006] A first aspect of the mold according to the present invention is a split mold that is split in a first direction and has a seal portion that divides a cavity; a pressing means for pressing the seal portion from a second direction intersecting the first direction; The gist of the project is to provide the following:

[0007] A second aspect of the mold according to the present invention is the mold according to the first aspect, the split mold includes a first mold and a second mold that forms the cavity between the first mold and a second mold, In the seal portion, the second die is disposed on the inner side of the first die, The pressing means may press an outer surface of the first mold.

[0008] A third aspect of the molding die according to the present invention is the molding die according to the first or second aspect, The pressing means may be provided in plurality along the seal portion.

[0009] A fourth aspect of the mold according to the present invention is any one of the first, second, or third aspects, The pressure sensor may further include an adjustment means for adjusting the pressure amount of the pressure means.

[0010] A fifth aspect of the mold according to the present invention is the mold according to any one of the first, second, third, or fourth aspects, The split mold may be a casting mold. Effect of the Invention

[0011] According to the molding die of the present invention, the occurrence of burrs can be prevented. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a side view showing a molding die according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a front view showing a molding die according to an embodiment of the present invention. [Diagram 3] FIG. 2 is an end view taken along line AA in FIG. [Figure 4] FIG. 3 is an end view taken along line BB in FIG. 2. [Diagram 5] FIG. 2 is an enlarged end view showing a main part of the molding die of the embodiment. [Figure 6] FIG. 2 is a schematic perspective view showing an expansion-molded product molded by the molding die of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Next, the mold according to the present invention will be described below by way of preferred examples with reference to the accompanying drawings. Note that the embodiments and drawings described below are merely illustrative of one embodiment of the present invention, and are not intended to limit the present invention to these configurations, and may be modified as appropriate without departing from the scope of the present invention. EXAMPLES

[0014] 1 and 2, a molding die 10 according to the embodiment includes a separable split die 12 and a pressing means 16 for pressing a seal portion 14 that defines a cavity 12a in the split die 12. The molding die 10 produces a foam-molded product 50 (see FIG. 6) such as a seat cushion by foam-molding a resin raw material supplied to the cavity 12a.

[0015] As shown in Figures 3 and 4, the split mold 12 includes a first mold 20 and a second mold 22 that forms a cavity 12a between the first mold 20 and the second mold 22. In the split mold 12 of the embodiment, the first mold 20 is a lower mold, and the second mold 22 is an upper mold that is disposed above the first mold 20 when the mold is closed. The split mold 12 opens by moving the second mold 22 upward to separate the first mold 20 and the second mold 22 from each other. In the embodiment, the first direction in which the split mold 12 is divided corresponds to the vertical direction, which is the up-down direction, and the second direction intersecting the first direction corresponds to the horizontal direction, which includes the front-rear direction and the left-right direction.

[0016] The split mold 12 may be a metal cutting mold, but is preferably a cast mold formed by electroforming, for example, aluminum, nickel, etc. By using the split mold 12 as a cast mold, the plate thicknesses of the first mold 20 and the second mold 22 can be formed thin, and the seal portion 14 can be effectively sealed by the pressing force of the pressing means 16 described later.

[0017] As shown in Figures 3 and 4, the first mold 20 includes a first mold surface portion 24 for forming the foam-molded product 50, a first mold mating portion 26 extending upward from the first mold surface portion 24, a first flange portion 28 bending from the first mold mating portion 26 and extending laterally outward, and a first support portion 36. The first mold surface portion 24, the first mold mating portion 26, and the first flange portion 28 are made of a thin metal plate. The first mold surface portion 24 is formed in a concave shape that opens upward. The first mold mating portion 26 is connected to the outer periphery of the first mold surface portion 24 and is inclined so as to open outward as it moves from the bottom to the top.

[0018] The first support portion 36 extends downward from the outer edge of the first flange portion 28, for example, and is arranged in the form of a wall surrounding the lateral outer side of the first mold mating portion 26. The first support portion 36 supports the first mold 20. Note that the first support portion 36 may be provided extending downward from the outer surface of the first mold surface portion 24. The first support portion 36 has a greater plate thickness than the first mold mating portion 26 and is more rigid than the first mold mating portion 26.

[0019] The second mold 22 includes a second mold surface portion 30 for forming the foam molded product 50, a second mold mating portion 32 extending upward from the second mold surface portion 30, a second flange portion 34 bending from the second mold mating portion 32 and extending laterally outward, and a second support portion 38. The second mold surface portion 30, the second mold mating portion 32, and the second flange portion 34 are made of a thin metal plate. The second mold surface portion 30 is formed in a concave shape that opens downward. The second mold surface portion 30 is disposed above the first mold surface portion 24, and the lower end of the second mold surface portion 30 and the upper end of the first mold surface portion 24 are joined together to form a cavity 12a.

[0020] The second mold mating part 32 is connected to the outer periphery of the second mold surface part 30 extending downward, and extends upward from the outer periphery. The second mold mating part 32 is inclined so as to open outward from the bottom to the top, similar to the first mold mating part 26. The second mold mating part 32 is disposed laterally inside the first mold mating part 26 when the split mold 12 is closed. In the split mold 12, when the split mold 12 is closed, the outer surface of the root part of the second mold mating part 32 that is connected to the second mold surface part 30 abuts against the inner surface of the root part of the first mold mating part 26 that is connected to the first mold surface part 24, and the second flange part 34 overlaps the upper side of the first flange part 28.

[0021] The second support portion 38 is formed, for example, in the shape of a wall extending upward from the outer edge of the second flange portion 34. The second support portion 38 reinforces the second die 22. Note that the second support portion 38 may be provided extending upward from the outer surface of the second die surface portion 30.

[0022] As shown in FIG. 5, the seal portion 14 is composed of a first mold mating portion 26 and a second mold mating portion 32 that come into contact with each other when the split mold 12 is closed. In the seal portion 14, the second mold mating portion 32 of the second mold 22 is disposed inside the first mold mating portion 26 of the first mold 20, and the first mold mating portion 26 and the second mold mating portion 32 overlap each other inward and outward in the lateral direction. When the split mold 12 is closed, the seal portion 14 seals the joint between the first mold surface portion 24 and the second mold surface portion 30. In the seal portion 14, no cushioning material such as rubber is disposed between the first mold mating portion 26 and the second mold mating portion 32, and the first mold mating portion 26 and the second mold mating portion 32, which are relatively hard and made of a metal material, come into direct contact with each other. The seal portion 14 is provided around the entire circumference of the joint between the first mold surface portion 24 and the second mold surface portion 30. In this manner, the seal portion 14 extends along a circumferential direction intersecting with the vertical direction (first direction).

[0023] 1 and 4, the molding die 10 has a hinge 40 that connects one edge of the first support part 36 and one edge of the second support part 38. In the split die 12, the second die 22 opens and closes relative to the first die 20, with the hinge 40 as a fulcrum.

[0024] 3 and 4, the pressing means 16 is provided on a first support portion 36 arranged laterally outside the first mold mating portion 26. The pressing means 16 presses the seal portion 14 of the split mold 12 from the lateral direction (second direction). More specifically, the pressing means 16 presses the outer surface of the first mold mating portion 26 of the first mold 20 from the lateral outside toward the inside.

[0025] 1 and 2, a plurality of pressing means 16 are provided along the seal portion 14. Specifically, a plurality of pressing means 16 are arranged at intervals along the seal portion 14 in each of the first support parts 36 surrounding the first mold mating part 26 from the front, rear, left and right.

[0026] As shown in FIG. 5(a), a bolt is used as the pressing means 16 in the embodiment. A nut 42 is attached to the pressing means 16, and the pressing means 16 to which the nut 42 is attached is attached to the first support part 36 through a female screw hole 44 formed on the outer surface of the first support part 36. As shown in FIG. 5(b), the pressing means 16 moves laterally due to the meshing structure between the male screw of the pressing means 16 and the female screw of the female screw hole 44 when the pressing means 16 itself is rotated. By moving the pressing means 16 laterally inward, the tip of the pressing means 16 is pressed against the outer surface of the first mold mating part 26, and the pressing amount of the pressing means 16 against the seal part 14 can be changed to increase. On the other hand, by moving the pressing means 16 laterally outward, the pressing amount of the pressing means 16 against the seal part 14 can be changed to decrease. In this way, the molding die 10 is configured to be able to change the pressing amount of the pressing means 16 against the seal part 14.

[0027] When the pressing amount of the pressing means 16 is changed, the nut 42 attached to the pressing means 16 is pressed against the outer surface of the first support portion 36. As shown in FIG. 5(b), the nut 42 is rotated, and moves laterally due to the meshing structure between the male thread of the pressing means 16 and the female thread of the nut 42, and is pressed against the outer surface of the first support portion 36. The nut 42 is pressed against the outer surface of the first support portion 36, thereby restricting the movement of the pressing means 16 against the first support portion 36. As a result, the pressing amount of the pressing means 16 is maintained. In this way, the molding die 10 includes an adjustment means capable of adjusting the pressing amount of the pressing means 16 against the seal portion 14, and the adjustment means in the embodiment is the female thread hole 44 formed on the outer surface of the first support portion 36 and the nut 42.

[0028] According to the above-mentioned molding die 10, the seal portion 14 that divides the cavity 12a in the split die 12 is pressed by the pressing means 16 from the horizontal direction intersecting with the vertical direction in which the split die 12 is separated, thereby eliminating gaps in the seal portion 14 and improving the sealing property of the seal portion 14. This makes it possible to prevent burrs from being generated at the parting line PL of the foam-molded product 50 manufactured by the molding die 10 (see FIG. 6). In addition, since the seal portion 14 of the split die 12 is pressed by the pressing means 16, it is possible to omit the work of grinding the seal portion 14 to fit the contact of the seal portion 14 and the work of periodically replacing the sealing material such as rubber, thereby improving the productivity of the foam-molded product 50 by the molding die 10. Furthermore, since the seal portion 14 of the split die 12 is pressed by the pressing means 16 to ensure the sealing property of the seal portion 14, the seal portion 14 does not deteriorate over time as in the configuration in which a sealing material such as rubber is sandwiched between the split die 12 for sealing, and the durability of the seal portion 14 can be improved.

[0029] In the sealed portion 14, the second mold mating portion 32 of the second mold 22 is positioned inside the first mold mating portion 26 of the first mold 20. Therefore, when the pressing means 16 presses the outer surface of the first mold mating portion 26, the first mold mating portion 26 is pressed toward the inner second mold mating portion 32, thereby improving the sealing property of the sealed portion 14.

[0030] In the molding die 10, a plurality of pressing means 16 are provided along the sealed portion 14, so that the plurality of pressing means 16 can press the sealed portion 14 in a balanced manner, improving the sealing performance in the circumferential direction of the sealed portion 14. Also, by changing the amount of pressing by each pressing means 16 according to the contact condition of the sealed portion 14, the difference in circumferential length between the first die 20 and the second die 22 can be distributed in a balanced manner.

[0031] Since the molding die 10 is provided with an adjustment means capable of adjusting the amount of pressing of the pressing means 16, it is possible to maintain the amount of pressing of the pressing means 16 that has been changed according to the contact condition of the sealed portion 14. This makes it possible to prevent the sealing property of the sealed portion 14 from changing due to loosening of the pressing means 16, etc. Furthermore, if the sealing property of the sealed portion 14 changes over time, the restriction on the movement of the pressing means 16 by the adjustment means is temporarily released, the amount of pressing of the pressing means 16 is changed, and the movement of the pressing means 16 is restricted by the adjustment means again. This makes it possible to maintain a high state of sealing property even if the sealing property of the sealed portion 14 changes over time.

[0032] Because the split mold 12 is a casting mold, the first mold mating portion 26 of the first mold 20 can be made thin, and the first mold mating portion 26 can be deformed toward the inner second mold mating portion 32 by the pressure of the pressing means 16. In this way, the pressure of the first mold 20 by the pressing means 16 can be effectively applied to the seal portion 14, and the sealing property of the seal portion 14 can be improved.

[0033] (Example of change) The present invention is not limited to the above-mentioned items, and may be, for example, as follows: It should be noted that the present invention is not limited to the specific descriptions of the examples and the following modified examples. (1) In the embodiment, a bolt is used as the pressing means. However, the present invention is not limited to this. For example, a fluid pressure cylinder such as a hydraulic cylinder may be used as the pressing means. (2) In the examples, a foam molding die for molding a foam-molded article has been given as the molding die. However, the molding die of the present disclosure may be applied to an injection molding die for molding an injection-molded article. [Explanation of symbols]

[0034] 10 molding die, 12 split die, 12a cavity, 14 sealing portion, 16 pressing means, 20 Type 1, 22 Type 2

Claims

1. a split mold that is split in a first direction and has a seal portion that defines a cavity; a pressing means for pressing the seal portion from a second direction intersecting the first direction; A molding die comprising:

2. the split mold includes a first mold and a second mold that forms the cavity between the first mold and a second mold, In the seal portion, the second die is disposed on the inner side of the first die, The mold according to claim 1 , wherein the pressing means presses an outer surface of the first mold.

3. The molding die according to claim 1 , wherein the pressing means is provided in a plurality along the seal portion.

4. The mold according to claim 1 , further comprising an adjustment means for adjusting the amount of pressure applied by the pressing means.

5. The molding die according to any one of claims 1 to 4, wherein the split die is a casting die.

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