Molding mold

Abstract

To provide a molding mold capable of preventing an occurrence of burrs.SOLUTION: A molding mold 10 is configured such that a first mold 12 and a second mold 14 are closed so that their seal portions 18, 20 come into contact with each other to form a cavity 16 inside, and the mold is opened in a first direction. The first mold 12 is provided so as to be movable in a second direction intersecting the first direction, and is equipped with a seal block 22 having the seal portion 18 of the first mold 12, and pressing means 24 that presses the seal block 22 in the second direction so that the seal portion 18 of the first mold 12 presses the seal portion 20 of the second mold 14 when the mold is closed.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a mold.

Background Art

[0002] In a mold, a resin material is injected into a cavity formed between an upper mold and a lower mold to form a molded product. If the resin material penetrates into the parting surface where the upper mold and the lower mold abut, burrs will occur. Therefore, it has been proposed to dispose a seal made of an elastic body such as rubber on the parting surface (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the seal is repeatedly molded, cracks, abrasions, sagging, etc. occur, resulting in burrs.

[0005] In view of the above problems in the prior art, the present invention has been proposed to preferably solve these problems, and an object thereof is to provide a mold capable of preventing the generation of burrs.

Means for Solving the Problems

[0006] A first aspect of the mold according to the present invention is a mold that forms a cavity inside by the abutment of the seal portions of each other when the first mold and the second mold are closed, and opens the mold in a first direction, wherein the first mold is provided so as to be movable in a second direction intersecting the first direction, and includes a seal block having a seal portion of the first mold, In summary, when the mold is closed, it includes pressing means for pressing the seal block in the second direction so that the seal portion of the first mold presses the seal portion of the second mold.

[0007] A second aspect of the mold according to the present invention is, in the first aspect, When the mold is closed, the seal portion of the second mold may be arranged inside the seal portion of the first mold.

[0008] A third aspect of the mold according to the present invention is, in the first aspect or the second aspect, The first mold has a plurality of the seal blocks, The second direction in each of the seal blocks may be a direction intersecting the direction in which the seal portion of the first mold in the seal block extends.

[0009] A fourth aspect of the mold according to the present invention is, in any one of the first aspect, the second aspect, or the third aspect, The seal portion of the first mold in the seal block may be provided at the tip corner portion of the seal block and may be in linear contact with the seal portion of the second mold along the parting line.

[0010] A fifth aspect of the mold according to the present invention is, in any one of the first aspect, the second aspect, the third aspect, or the fourth aspect, The seal portion of the first mold in the seal block may be a softer metal than the seal portion of the second mold.

Advantages of the Invention

[0011] According to the mold of the present invention, the generation of burrs can be prevented.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0013] Next, the mold according to the present invention will be described below with reference to the accompanying drawings by giving a preferred example. The embodiments and drawings described below illustrate an example of the embodiment of the present invention, and are not used for the purpose of limiting to these configurations, and can be appropriately changed without departing from the gist of the present invention.

Example

[0014] As shown in FIGS. 1 and 2, the mold 10 according to the example includes a first mold 12 and a second mold 14 that can be relatively opened and closed in the first direction. In the mold 10, when the first mold 12 and the second mold 14 are closed, the seal parts 18 and 20 of each other come into contact, so that a cavity 16 is formed inside the mold 10. Further, the mold 10 is closed when the first mold 12 and the second mold 14 approach each other relatively in the first direction, and is opened when the first mold 12 and the second mold 14 move relatively away from each other in the first direction. The mold 10 manufactures a foam-molded product by foam-molding the resin raw material supplied to the cavity 16. The foam-molded product manufactured by the mold 10 is not particularly limited, and examples include vehicle parts such as seat cushions, furniture such as sofas, and other products.

[0015] As shown in FIGS. 1 and 2, in the mold 10 of the embodiment, the first mold 12 is the lower mold, and the second mold 14 is the upper mold arranged above the first mold 12 when the mold is closed. The mold 10 opens the mold by moving the second mold 14 upward to separate the first mold 12 and the second mold 14 from each other. That is, in the embodiment, in the first direction in which the mold 10 is opened or closed, the vertical direction, which is the up-and-down direction, corresponds. Further, the second direction intersecting the first direction corresponds to a direction having components in the lateral direction including the front-back direction and the left-right direction, and the second direction of the embodiment is a direction that slopes downward as it goes from the inside to the outside of the lateral direction.

[0016] As shown in FIGS. 1 and 2, the first mold 12 includes a seal block 22 having a seal portion (hereinafter referred to as the first seal portion) 18 of the first mold 12 that abuts against a seal portion (hereinafter referred to as the second seal portion) 20 of the second mold 14, and pressing means 24 that presses the seal block 22. The first mold 12 further includes a mold body 26 having a first mold surface portion 26a for molding a foamed molded product, a first mold mating portion 26b extending upward from the first mold surface portion 26a, and a first mold parting portion 26c that bends from the first mold mating portion 26b and extends outward in the lateral direction. The first mold surface portion 26a is formed in a concave shape that opens upward. The first mold mating portion 26b is inclined so as to open outward as it goes from the lower side to the upper side. The mold body 26 has an installation portion 28 that opens into the first mold mating portion 26b and is concave and slopes downward as it goes from the inside to the outside of the lateral direction, and the seal block 22 is fitted and installed in this installation portion 28.

[0017] As shown in FIG. 4, the first seal portion 18 of the embodiment is composed of a first seal portion provided on the seal block 22 (hereinafter referred to as a movable first seal portion 18A when particularly distinguished) and a first seal portion provided on the mold body 26 (hereinafter referred to as a fixed first seal portion 18B when particularly distinguished). The movable first seal portion 18A is arranged at a straight portion on the parting line and a bent portion that protrudes inward in the lateral direction. The fixed first seal portion 18B is arranged at a bent portion that protrudes outward in the lateral direction on the parting line.

[0018] As shown in Fig. 3, the seal block 22 is provided so as to be movable in a second direction intersecting the first direction. Specifically, the seal block 22 is guided by upper and lower wall surfaces extending in the second direction in the installation portion 28 and is movable in the second direction independently of the mold body 26. By moving the seal block 22 inward in the lateral direction (diagonally upward) in the second direction, the protruding dimension of the movable first seal portion 18A from the first mold mating portion 26b increases (see the dashed-dotted line in Fig. 3(b)). By moving the seal block 22 outward in the lateral direction (diagonally downward) in the second direction, the protruding dimension of the movable first seal portion 18A from the first mold mating portion 26b decreases.

[0019] As shown in Fig. 3, the seal block 22 has a tapered triangular tip 22a with a decreasing vertical dimension from the outer side to the inner side in the lateral direction on the inner lateral surface facing the second mold 14, and a movable first seal portion 18A is provided at the corner of this tip 22a. The movable first seal portion 18A is a corner extending along the parting line, and the movable first seal portion 18A and the second seal portion 20 of the second mold 14 are in linear contact along the parting line.

[0020] The first mold mating portion 26b of the mold body 26 has a tapered triangular tip with a decreasing vertical dimension from the outer side to the inner side in the lateral direction on the inner lateral surface facing the second mold 14, and a fixed first seal portion 18B is provided at the corner of this tip. The fixed first seal portion 18B is a corner extending along the parting line, and the fixed first seal portion 18B and the second seal portion 20 of the second mold 14 are in linear contact along the parting line.

[0021] As shown in FIG. 4, the first type 12 has a plurality of seal blocks 22. Specifically, in the first type 12, the plurality of seal blocks 22 are arranged side by side in a direction along the parting line. The plurality of seal blocks 22 are divided and arranged, for example, so as to correspond to the straight portion and the bent portion in the parting line. Further, in the first type 12 of the embodiment, the movable first seal portions 18A of the plurality of seal blocks 22 are arranged side by side in the extending direction of the parting line, and sealing is constituted by the movable first seal portions 18A of the plurality of seal blocks 22. Each seal block 22 is movable independently in the second direction, and the position of the movable first seal portion 18A can be adjusted for each seal block 22. Here, the second direction in each seal block 22 is a direction intersecting the direction in which the movable first seal portion 18A of the first type 12 in the seal block 22 extends (the extending direction of the parting line). For example, for the seal block 22 corresponding to the straight portion of the parting line, the seal block 22 may be made movable so that the lateral component in the second direction is orthogonal to the straight portion. Further, for the seal block 22 corresponding to the bent portion of the parting line, the seal block 22 may be made movable so that the lateral component in the second direction is along the radial direction of the bent portion. In the embodiment, the seal block 22 is not arranged at the bent portion that protrudes outward in the lateral direction in the parting line, but the plurality of seal blocks 22 may be continuously arranged over the entire circumference in the extending direction of the parting line.

[0022] As shown in FIG. 3, the pressing means 24 is provided on the mold body 26 of the first type 12. When the mold of the molding die 10 is closed, the pressing means 24 presses the seal block 22 in the second direction so that the movable first seal portion 18A of the first type 12 presses the second seal portion 20 of the second type 14. In this way, the direction in which the pressing means 24 presses the seal block 22 is the same as the movable direction of the seal block 22. By pressing the seal block 22, the movable first seal portion 18A of the seal block 22 is moved inward in the lateral direction.

[0023] As shown in FIG. 4, a plurality of pressing means 24 are provided along the movable first seal portion 18A. One seal block 22 may be pressed by one pressing means 24, or one seal block 22 may be pressed by a plurality of pressing means 24 arranged at intervals in the extending direction of the movable first seal portion 18A in this seal block 22. For example, in the case of a seal block 22 having a relatively long movable first seal portion 18A corresponding to a straight portion of the parting line, it is advisable to press the seal block 22 with a plurality of pressing means 24. Also, in the case of a seal block 22 having a relatively short movable first seal portion 18A corresponding to a bent portion of the parting line, the seal block 22 may be pressed with a small number of pressing means 24, such as one.

[0024] As shown in FIG. 3, bolts are used as the pressing means 24 in the embodiment. The pressing means 24 is attached to the mold body 26 by screwing the male screw of the pressing means 24 into the female screw 30a formed in the through hole 30 penetrating from the bottom wall of the installation portion 28 to the outer surface of the mold body 26. The head of the pressing means 24 is disposed outside the mold body 26, and the pressing means 24 can be operated from the outside of the first mold 12. A nut 32 is attached to the pressing means 24. By rotating itself, the pressing means 24 moves in the second direction due to the meshing structure between the male screw of the pressing means 24 and the female screw 30a of the mold body 26. When the pressing means 24 moves inward in the lateral direction, the pressing piece 34 protruding from the seal block 22 and inserted into the through hole 30 is pushed. Then, the seal block 22 is pushed inward in the lateral direction, and the pressing amount of the movable first seal portion 18A in the seal block 22 against the second seal portion 20 can be changed so as to increase. On the contrary, by moving the pressing means 24 outward in the lateral direction, the pressing amount of the movable first seal portion 18A in the seal block 22 against the second seal portion 20 can be changed so as to decrease. Thus, the molding die 10 is configured such that the pressing amount of the movable first seal portion 18A (seal block 22) against the second seal portion 20 in the seal block 22 can be changed by the pressing means 24 that presses the movable first seal portion 18A.

[0025] As shown in FIG. 3, when the pressing amount is changed by the pressing means 24, the nut 32 attached to the pressing means 24 is pressed against the outer surface of the mold body 26. The nut 32 moves in the second direction and abuts against the outer surface of the mold body 26 due to the meshing structure between the male screw of the pressing means 24 and the female screw of the nut 32 as it rotates. When the nut 32 is pressed against the outer surface of the mold body 26, the movement of the pressing means 24 with respect to the mold body 26 is restricted. As a result, the pressing amount of the movable first seal portion 18A in the seal block 22 by the pressing means 24 against the second seal portion 20 is maintained. In this way, the molding die 10 includes an adjusting means capable of adjusting the pressing amount of the movable first seal portion 18A in the seal block 22 by the pressing means 24 against the second seal portion 20, and the adjusting means of the embodiment is constituted by the female screw 30a formed in the mold body 26 and the nut 32.

[0026] As shown in FIGS. 1 and 2, the second mold 14 includes a second mold surface portion 14a for molding a foamed molded product, a second mold mating portion 14b extending upward from the second mold surface portion 14a, and a second mold parting portion 14c bent from the second mold mating portion 14b and extending laterally outward. The second mold surface portion 14a is disposed above the first mold surface portion 26a. The second mold mating portion 14b is continuous with the outer peripheral portion of the second mold surface portion 14a and extends upward at an angle with respect to the outer peripheral portion of the second mold surface portion 14a. The second mold mating portion 14b is inclined so as to open outward from the lower side to the upper side, similar to the first mold mating portion 26b. Further, when the molding die 10 is closed, the second mold mating portion 14b is disposed inside the first mold mating portion 26b in the lateral direction, and the second mold parting portion 14c overlaps the upper side of the first mold parting portion 26c.

[0027] As shown in FIG. 3, in the second mold 14, the second seal portion 20 is formed at the vicinity of the corner where the second mold face portion 14a and the second mating portion 14b of the second mold 14 are connected. That is, when the mold 10 is closed, the second seal portion 20 provided near the corner where the second mold face portion 14a and the second mating portion 14b of the second mating portion 14b of the second mold 14 are connected, the movable first seal portion 18A provided at the corner of the tip 22a of the seal block 22 in the first mold 12, and the fixed first seal portion 18B of the mold body 26 are in linear contact along the parting line. Further, when the mold 10 is closed, the second seal portion 20 of the second mold 14 is disposed more inward in the lateral direction than the first seal portion 18 of the first mold 12.

[0028] In the mold 10, the mold body 26 of the first mold 12 and the second mold 14 may be a so-called casting mold formed by, for example, pouring molten aluminum into a mold, or electrocasting a metal such as nickel, but it is preferably a cutting mold of a metal such as steel, aluminum, or nickel. Further, the seal block 22 may be formed of the same metal material as the mold body 26 of the first mold 12, or may be formed of a different metal material. Here, it is preferable that the movable first seal portion 18A of the first mold 12 in the seal block 22 is a softer metal (for example, copper) than the second seal portion 20 of the second mold 14. In this case, either the entire seal block 22 may be formed of a softer metal than the second seal portion 20, or only the tip 22a in the seal block 22 may be formed of a softer metal than the second seal portion 20. Note that the fixed first seal portion 18B may also be formed of a softer metal than the second seal portion 20 of the second mold 14, similar to the movable first seal portion 18A.

[0029] As shown in FIGS. 1 and 3(a), the seal of the mold 10 is composed of a first seal portion 18 and a second seal portion 20 that abut against each other when the mold is closed. In the seal, the second seal portion 20 of the second mold 14 is disposed inside the first seal portion 18 of the first mold 12, and the first seal portion 18 and the second seal portion 20 overlap each other inside and outside in the lateral direction. When the mold 10 is closed, the seal of the mold 10 seals the cavity 16. In the seal of the mold 10, a cushioning material such as rubber is not disposed between the first mold 12 and the second mold 14, and the relatively hard first seal portion 18 and the second seal portion 20 made of a metal material are in direct contact with each other. The seal of the mold 10 is provided along the parting line over the entire circumference of the parting line. Thus, the seal of the mold 10 extends along the circumferential direction intersecting the longitudinal direction (first direction).

[0030] The first mold 12 of the mold 10 described above includes a seal block 22 provided so as to be movable in a second direction intersecting the first direction, which is the opening and closing direction of the first mold 12 and the second mold 14. Further, the first mold 12 includes pressing means 24 that presses the seal block 22 in the second direction so that the movable first seal portion 18A provided on the seal block 22 presses the second seal portion 20 of the second mold 14 when the mold 10 is closed. In this way, by pressing the seal block 22 provided with the movable first seal portion 18A from a second direction different from the first direction, the gap between the movable first seal portion 18A of the first mold 12 and the second seal portion 20 of the second mold 14 is eliminated, and the sealing performance of the seal that seals the cavity 16 in the mold 10 can be improved. Thereby, it is possible to prevent burrs from occurring in the foam molded product manufactured by the mold 10 due to the foam resin leaking from the seal.

[0031] By moving the seal block 22 in the second direction different from the opening and closing direction of the mold 10, the pressing amount of the movable first seal portion 18A against the second seal portion 20 can be adjusted, so that the movable first seal portion 18A can be adjusted independently of the opening and closing of the mold 10.

[0032] Since the seal block 22 of the first mold 12 is pressed by the pressing means 24, operations such as shaving the movable first seal portion 18A to match the contact with the second seal portion 20 and periodically replacing the seal material such as rubber can be omitted, and the productivity of the foam molded product by the molding die 10 can be improved. Further, since the seal block 22 of the first mold 12 is pressed by the pressing means 24 to ensure the sealing property of the seal of the molding die 10, unlike the configuration in which a seal material such as rubber is sandwiched between the first mold 12 and the second mold 14 for sealing, the seal material does not deteriorate over time, and the durability of the seal in the molding die 10 can be improved.

[0033] When the molding die 10 is closed, since the second seal portion 20 of the second mold 14 is disposed inside the first seal portion 18 of the first mold 12, the pressing means 24 presses the seal block 22 inward in the lateral direction, so that the movable first seal portion 18A is pressed toward the second seal portion 20 of the inner second mold 14, and the sealing property of the seal can be improved.

[0034] Since the first mold 12 has a plurality of seal blocks 22, the pressing amount of each of the plurality of seal blocks 22 can be adjusted, and the pressing amount of the movable first seal portion 18A can be adjusted in a well-balanced manner to improve the sealing property in the extending direction of the first seal portion 18. Further, by changing the pressing amount of each seal block 22 according to the contact condition between the movable first seal portion 18A and the second seal portion 20, the perimeter difference between the first mold 12 and the second mold 14 can be evenly dispersed. And since the movement of each seal block 22 is in a direction intersecting the direction in which the movable first seal portion 18A extends in the seal block 22, the movable first seal portion 18A can be pressed from an appropriate direction matching the extending direction of the movable first seal portion 18A such as linear or curved, and the sealing property of the seal in the molding die 10 can be improved.

[0035] The movable first seal portion 18A of the seal block 22 is provided at the corner of the tip 22a in the seal block 22. When the mold 10 is closed, the first seal portion 18 of the first mold 12 and the second seal portion 20 of the second mold 14 are in linear contact along the parting line. By doing so, when the movable first seal portion 18A is pressed toward the second seal portion 20, it becomes easier to concentrate the force on the first seal portion 18, and the movable first seal portion 18A can be efficiently pressed against the second seal portion 20. Therefore, the sealing performance of the seal of the mold 10 can be improved.

[0036] If the movable first seal portion 18A of the seal block 22 is made of a metal softer than the second seal portion 20 of the second mold 14, when the movable first seal portion 18A is pressed toward the second seal portion 20, the movable first seal portion 18A is more likely to conform to the second seal portion 20, and the movable first seal portion 18A can be efficiently pressed against the second seal portion 20. Therefore, the sealing performance of the seal of the mold 10 can be improved.

[0037] Since the mold 10 is provided with an adjustment means capable of adjusting the pressing amount of the movable first seal portion 18A in the seal block 22 against the second seal portion 20 by the pressing means 24, it is possible to maintain the pressing amount by the pressing means 24 changed according to the contact condition of the movable first seal portion 18A against the second seal portion 20. Thereby, it is possible to avoid the change in the sealing performance of the seal of the mold 10 due to the loosening of the pressing means 24 or the like. Further, when the sealing performance of the seal of the mold 10 changes over time, the restriction on the movement of the pressing means 24 by the adjustment means is temporarily released, the pressing amount by the pressing means 24 is changed, and the movement of the pressing means 24 is restricted again by the adjustment means. Thereby, even when the sealing performance of the seal of the mold 10 changes over time, it is possible to maintain a high sealing state.

[0038] (Modified Example) Not limited to the above-described matters, for example, the following may be done. Note that the present invention is not limited only to the specific descriptions of the embodiments and the following modified examples. (1) In the embodiment, a bolt was used as the pressing means, but it is not limited thereto. For example, a fluid pressure cylinder such as a hydraulic cylinder may be used as the pressing means. (2) In the embodiment, the first type of seal portion was constituted by the seal portion provided on the seal block and the seal portion provided on the mold body, but it is not limited thereto. The entire first type of seal portion may be constituted by the seal portion provided on the seal block. (3) In the embodiment, as the molding die, a foam molding die for molding a foam molded product was cited, but it is not limited thereto. The molding die of the present disclosure may be applied to an injection molding die for molding an injection molded product.

Explanation of Reference Numerals

[0039] 10 Molding die, 12 First mold, 14 Second mold, 16 Cavity, 18 First seal portion (seal portion of the first mold), 18A Movable first seal portion, 20 Second seal portion (seal portion of the second mold), 22 Seal block, 24 Pressing means

Claims

1. A molding die in which a first mold and a second mold are closed so that their seal portions come into contact with each other to form a cavity therein, and the mold is opened in a first direction, The first type is a seal block provided to be movable in a second direction intersecting the first direction and having the first type seal portion; and a pressing means for pressing the seal block in the second direction so that the seal portion of the first mold presses the seal portion of the second mold when the mold is closed.

2. The mold according to claim 1 , wherein the seal portion of the second mold is disposed more inward than the seal portion of the first mold when the mold is closed.

3. The first mold has a plurality of the seal blocks, The mold according to claim 1 , wherein the second direction in each of the seal blocks is a direction intersecting a direction in which the seal portion of the first mold in the seal block extends.

4. 2. The mold according to claim 1, wherein the seal portion of the first mold in the seal block is provided at a corner of a leading end of the seal block and abuts against the seal portion of the second mold in a linear manner along a parting line.

5. The mold according to claim 4 , wherein the seal portion of the first mold in the seal block is made of a metal softer than the seal portion of the second mold.

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