Method for molding molded products

Abstract

To provide a mold part etc. that is not limited in shape or structure of molded products that can be molded. [Solution] A mold part that is placed in a molding mold consisting of a first mold and a second mold for injecting molding material into an internal cavity to produce a molded product corresponding to the shape of the cavity, and includes a first mold part and a second mold part that are inserted and removed by sliding from a side of the molding mold that is perpendicular to the contact surface between the first mold and the second mold, and the first mold part and the second mold part form a hollow portion that connects the first opening to the second opening of the molded product.

Description

[Technical Field]

[0001] The present invention relates to a mold part, a molding mold, and a molding method for a molded product. [Background technology]

[0002] Generally, molded objects such as plastic models made from resin are constructed by connecting a plurality of parts to be assembled to a runner (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-142578 Summary of the Invention [Problem to be solved by the invention]

[0004] Such molded products are produced by solidifying the molding material that is poured into the cavity formed between the fixed and movable sides of the injection mold. The shape and structure of the molded product depend on the shape of the injection mold.

[0005] An object of the present invention is to provide a mold part, a molding die, and a molding method for molding a molded product that are not limited in terms of the shape or structure of the molded product that can be molded. [Means for solving the problem]

[0006] The present invention provides, for example, a mold part that is placed in a molding mold consisting of a first mold and a second mold for injecting a molding material into an internal cavity to produce a molded product corresponding to the shape of the cavity, and includes a first mold part and a second mold part that are inserted and removed by sliding from a side of the molding mold that is perpendicular to the contact surface between the first mold and the second mold, and the first mold part and the second mold part form a hollow portion that connects the first opening to the second opening of the molded product.

[0007] Another aspect of the present invention is, for example, a molding die having the above-mentioned die parts, comprising a first die and a second die, and at least one of the first die and the second die has a runner groove formed so as to bypass the insertion and removal paths of the first die part and the second die part.

[0008] Yet another aspect of the present invention is a method for molding, for example, a molded product, which includes a first step of injecting a molding material into the above-mentioned molding die in which the first mold part and the second mold part are arranged in predetermined positions to mold a molded product consisting of a plurality of parts connected to runners, a second step of removing the first mold part from the molding die, a third step of removing the second mold part from the molding die, and a fourth step of removing the molded product. [Effects of the Invention]

[0009] The present invention can provide a mold part, a molding die, and a molding method for molding a molded product, which are not limited in terms of the shape or structure of the moldable molded product. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view illustrating a molding device 10 according to an embodiment. [Figure 2] 3 is a flowchart corresponding to an example of a molding method for a molded product according to the embodiment. [Figure 3] FIG. 2 is a diagram showing an example of the appearance of a molded product according to an embodiment. [Figure 4] 10A and 10B are diagrams showing an example of how slide mold parts are used to explain a molding method for a molded product. [Figure 5] 10A and 10B are diagrams for explaining the correspondence between surfaces constituting a molded product and slide mold parts. [Figure 6] 10A and 10B are diagrams showing examples of the configuration of runners for securing insertion and removal paths for slide mold parts. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following embodiments will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the scope of the claimed invention, and not all combinations of features described in the embodiments are necessarily essential to the invention. Two or more of the features described in the embodiments may be combined arbitrarily. Identical or similar components are designated by the same reference numerals, and redundant descriptions will be omitted. In each drawing, the up / down, left / right, front / back directions relative to the paper surface will be used in the description of the present embodiment as the up / down, left / right, front / back directions of the components (or parts) in the present embodiment. While the present invention assumes a resin material as the molding material in the embodiments described below, this is not limited to this, and other materials (such as thermoplastic resins such as polystyrene, polyethylene, and ABS, thermosetting resins, and metals) can also be used.

[0012] Figure 1 shows a cross-sectional view of a molding apparatus 10 corresponding to an embodiment of the invention. As shown in Figure 1, molding apparatus 10 of this embodiment has a movable mold body 102 attached to the moving side of a molding material injection device (not shown) that injects molding material, and a fixed mold body 103 attached to the fixed side of the molding material injection device. Runner grooves into which the molding material flows are formed in each of movable mold body 102 and fixed mold body 103.

[0013] The movable mold body 102 includes a male mold mounting plate 107 to which a male mold 106 is attached, a fixed base 108 to which the male mold mounting plate 107 is fixed, a movable side mounting plate 109 to which the molding material injection device is attached, and a spacer 110 provided between the fixed base 108 and the movable side mounting plate 109. The male mold 106 and the male mold mounting plate 107 may be configured integrally or may be configured as separate, independent bodies. A cavity 111 is formed in the fixed base 108, and a movable pusher plate 112 is provided within the cavity 111. The pusher plate 112 is fixed to a pressing shaft 116 provided in openings 114, 115 formed in the fixed base 108 and the movable side mounting plate 109. The pusher plate 112 also has a knockout pin 113 formed therein, which penetrates the male mold mounting plate 107 and the male mold 106. Here, by moving the push-out plate 112, the tip of the knock-out pin 113 is formed to protrude into the runner groove.

[0014] The fixed mold body 103 has a fixed mounting plate 117 attached to the molding material injection device, a female mold mounting plate 119 to which a female mold 118 is attached, and a spacer 120 provided between the fixed mounting plate 117 and the female mold mounting plate 119. The female mold 118 and the female mold mounting plate 119 may be configured integrally or may be configured as separate, independent bodies. A sprue bushing 104 is attached to the fixed mold body 103 for injecting molten molding material from a molding injection device. The sprue bushing 104 extends through the fixed mounting plate 117 to the female mold 118, and a sprue 105 is formed inside the sprue bushing 104 to serve as a supply channel for molten resin. The sprue 105 is connected to runner grooves formed in the female mold 118 and the male mold 106, and the molding material flows into a molding space (cavity) formed between the female mold 118 and the male mold 106 via this runner groove.

[0015] The male mold 106 and the female mold 118 each have a concave-convex shape, and these concave-convex shapes combine to form a cavity that defines the outer shape of the molded product. The molding material flows into the cavity, and when it cools and hardens, a molded product corresponding to the cavity shape is formed. Hereinafter, the male mold 106 and the female mold 118 are collectively referred to as the molding die.

[0016] The molding die is configured to include a plurality of mold parts that are configured to be insertable into and removable from the molding die. The mold parts are arranged on the contact surface between the male die 106 and the female die 118, and are inserted into the cavity formed in the molding die from a side of the molding die that is perpendicular to the contact surface. This makes it possible to prevent the molding material from flowing into the inside of the cavity defined by the male die 106 and the female die 118, making it possible to form a hollow or cylindrical molded product.

[0017] In this embodiment, by inserting mold parts from multiple directions into a cavity for molding one molded product, it becomes possible to mold a molded product with a shape that would not be possible with a single mold part. In this embodiment, the above-mentioned mold parts are called slide mold parts.

[0018] In the molding apparatus 10 shown in Figure 1, after the molding material is poured into the runner grooves and the cavities for forming each part to form a molded product, the movable mold body 102 is separated from the fixed mold body 103, and then the sliding mold parts are separated from the movable mold body 102. After all the sliding mold parts have been separated, the pressing shaft 116 is pressed to move the push-out plate 112, and the knock-out pin 113 provided on the push-out plate 112 pushes out the molded product attached to the male mold 106 that constitutes the movable mold body 102, and the molded product can be removed.

[0019] FIG. 1 is a diagram showing an example of the structure of the molding device 10, and the structure of the molding device 10 is not limited to that shown in FIG. 1, and various modifications are possible.

[0020] Next, a molding method for a molded product according to this embodiment will be described with reference to FIG. 2. First, in S201, the male mold 106 is set on the movable mold body 102 of the molding device 10. Then, in S202, the first slide mold part is set, and in S203, the second slide mold part is set. Here, the first slide mold part and the second slide mold part are set as a pair of mold parts, and a hollow molded product can be molded by combining the two slide mold parts with the male mold 106 and the female mold 118. Furthermore, multiple pairs of slide mold parts can be included for the male mold 106 and the female mold 118. Furthermore, three or more slide mold parts may be combined for one molded product.

[0021] The first slide mold part and the second slide mold part can be attached to a predetermined slide mechanism of the movable mold body 102 of the molding device 10. The slide mechanism allows each slide mold to slide (slide) in a predetermined direction, to be inserted into a cavity formed by the male mold and female mold before the molding material is poured, and to be removed after the molding material has solidified.

[0022] In the following S204, the movable mold body 102 including the slide mold parts is moved toward the fixed mold body 103 and combined with the fixed mold body 103. In the following S205, the molding material is injected from the sprue 105, and the molding material flows into the cavity formed by the male mold 106, female mold 118, and slide mold parts. After that, when the molding material cools and hardens, the movable mold body 102 is separated from the fixed mold body 103. At this point, the molded product is attached to the movable mold body 102 side.

[0023] In the next S207, the first slide mold part is separated from the interior of the molded product by the slide mechanism of the molding device 10, and in S208, the second slide mold part is separated from the interior of the molded product by the slide mechanism of the molding device 10. Since attempting to remove the molded product before the slide mold parts have been separated could result in damage to the molded product, the molded product is removed after all slide mold parts have been separated. In the next S209, the push-out plate 112 is moved to project the tip of the knock-out pin 113 into the runner groove, thereby removing the molded product.

[0024] Next, an example of the configuration of a molded product according to this embodiment will be shown with reference to Fig. 3. Fig. 3(A) is a diagram showing an example of the appearance of molded product 300 from a direction in which opening 301 of molded product 300 faces the front. Fig. 3(B) is a diagram showing an example of the appearance of molded product 300 from a direction in which opening 301 of molded product 300 faces left. Fig. 3(C) is a diagram showing an example of the appearance of molded product 300 from the bottom side of molded product 300.

[0025] Molded product 300 shown in Fig. 3 is a hollow model part that has two openings, opening 301 on the front and opening 303 on the bottom, and these openings are connected. Molded product 300 is configured so that it can be connected to other molded products via openings 301 and 303, thereby forming part of a finished toy body. Openings 301 and 303 are formed on different sides of molded product 300, but the arrangement of the openings is not limited to the form shown in Fig. 3.

[0026] Although a model component shaped like molded product 300 can be made by combining two molded products, this embodiment assumes that it will be molded as a single part. Therefore, the hollow portion connecting opening 301 to opening 303 must be formed by expelling the molding material from the cavity using a slide mold part. In this case, if an attempt is made to mold the hollow portion using only a single slide mold part, the portion indicated by the shaded area 304 in Figure 3 must be opened. However, if opening 301 is made larger, the internal structure becomes visible from the outside, which is undesirable.

[0027] Therefore, in this embodiment, by combining a slide mold part (first slide mold part) that is inserted from the opening 303 side to form the hollow portion and a slide mold part (second slide mold part) that forms the edge portion 302 of the opening 301, it is possible to form the hollow portion while keeping the opening 301 as small as possible.

[0028] 4 is a cross-sectional view showing an example of the relationship between the slide mold parts and the male mold 106. In FIG. 4, (A) shows the case where only a single slide mold part 401 is used, and (B) shows the case where slide mold parts 411 and 412 are used.

[0029] 4(A), the slide mold part 401 is inserted from the bottom side of the male mold 106, with the top side protruding. This allows for molding of a hollow molded product 400. However, at this time, the opening on the top side of the molded product 400 must be shaped so as not to interfere with removal of the slide mold part 401.

[0030] In contrast, in FIG. 4(B), the slide mold part 411 is inserted from the bottom side of the male mold 106, and the slide mold part 412 is inserted from diagonally above the male mold 106 into the top side. This allows the molding of a hollow molded product 410. In this manner, the slide mold parts 411 and 412 are inserted and removed from different sides of the molding die. The shape of the opening on the top side of the molded product 410 is determined by the combination of the slide mold parts 411 and 412. That is, a first portion of the opening that does not interfere with the withdrawal of the slide mold part 411 can be formed by the slide mold part 411, and the remaining second portion can be formed within a range that does not interfere with the withdrawal of the slide mold part 412. Alternatively, the entire opening (especially the edge) can be formed by the slide mold part 412. This allows the use of multiple slide mold parts with different withdrawal directions to achieve a shape that could not be formed with a single slide mold part.

[0031] Next, the configuration of the hollow portion of the molded product 300 will be described with reference to Fig. 5. Fig. 5(A) shows an example of the cross-sectional configuration of the molded product 300 when viewed from one direction in the AA cross section of the molded product 300 in Fig. 3(A). Fig. 5(B) shows an example of the cross-sectional configuration of the molded product 300 when viewed from the opposite direction in the AA cross section of the molded product 300 in Fig. 3(A).

[0032] At this time, the area corresponding to inner wall portion 501 continuing from lower opening 303 of molded product 300 can be molded by a first slide mold part corresponding to slide mold part 411 in Fig. 4. Furthermore, the area corresponding to the portion shown as edge portion 302 of opening 301 of molded product 300 in Fig. 3 can be molded by a second slide mold part corresponding to slide mold part 412 in Fig. 4. In this way, by combining slide mold parts, it is possible to mold a molded product with a shape that could not be molded with a single slide mold part.

[0033] Next, an example of a runner structure for ensuring an insertion / removal path for slide mold parts will be described with reference to Fig. 6. Fig. 6(A) is a diagram showing an example of a state in which slide mold parts are inserted, and Fig. 6(B) is a diagram showing an example of a state in which slide mold parts are removed. Note that Fig. 6 omits the male mold 106 and female mold 118.

[0034] As shown in FIG. 6(A), a slide mold part 602 is inserted into a molded product 601. At this time, the molded product 601 is connected to a runner 603. The runner part 603 of the runner, which is located in the insertion / removal direction of the slide mold part, is shaped to bypass (or straddle) the slide mold part 602. This ensures an insertion / removal path for the slide mold part 602 as shown in FIG. 6(B), so that the runner part 603 does not get in the way during insertion / removal. If the runner part 603 were located in a position overlapping the slide mold part 602, it would be impossible to inject molding material into the runner groove, or the runner would have to be destroyed to remove the slide mold part 602. Therefore, in this embodiment, a runner groove is formed in at least one of the male mold 106 and the female mold 118 so as to bypass the slide mold part 602 or its insertion / removal path.

[0035] Figure 6 shows a case where runner parts 603 are provided in only one direction, but when using the two slide mold parts described above or more slide mold parts, the runners located in the insertion / removal direction of each slide mold part are arranged in a detour to ensure an insertion / removal path for the slide mold part.

[0036] According to the molding die corresponding to the above-described embodiments, by combining two or more slide mold parts, it is possible to form molded products with shapes that could not be formed with a single slide mold part.

[0037] <Summary of the embodiment> The above-described embodiments disclose at least the following mold parts, molding molds, and molding methods for molded products. (1) A mold part to be placed in a molding mold consisting of a first mold and a second mold for injecting a molding material into an internal cavity to produce a molded product corresponding to the shape of the cavity, The molding die includes a first mold part and a second mold part that are inserted and removed by sliding from a side surface of the molding die that is perpendicular to a contact surface between the first mold and the second mold, The first mold part and the second mold part form a hollow portion that connects the first opening to the second opening of the molded article. (2) The mold parts described in (1), wherein the first mold part forms an inner wall that is continuous with the first opening of the molded product, and the second mold part forms the edge of the second opening of the molded product. (3) The mold part according to (2), wherein the first opening and the second opening are formed on different surfaces of the molded product. (4) A mold part according to any one of (1) to (3), wherein the first mold part and the second mold part have different insertion and removal directions. (5) A mold part according to any one of (1) to (4), wherein the first mold part and the second mold part are inserted and removed from different sides of the molding die. (6) A molding die comprising the die component according to any one of (1) to (5), A first mold and a second mold are provided, A molding die having a runner groove formed in at least one of the first die and the second die so as to bypass the insertion and removal paths of the first die part and the second die part. (7) The molding die according to (6), wherein a first step is to inject a molding material into the molding die in which the first mold part and the second mold part are disposed in predetermined positions, thereby molding a molded product in which a plurality of parts are connected to a runner; a second step of removing the first mold part from the molding die; a third step of removing the second mold part from the molding die; a fourth step of removing the molded product; A method for molding a molded article, comprising:

[0038] The invention is not limited to the above-described embodiment, and various modifications and variations are possible within the scope of the gist of the invention.

Claims

1. A method for forming a molded product, The first step is to mold an object composed of multiple parts connected to a runner, A second step of forming a first opening in at least one of the plurality of parts, A third step of forming a second opening on a surface of the first part that is different from the surface on which the first opening is formed, A fourth step is to remove the molded product, Includes, The first part includes a cavity connecting the first opening and the second opening. In the second step, the first opening is formed by the first mold component. A molding method in which, in the third step, the second opening is formed by a second mold component different from the first mold component.

2. The molding method according to claim 1, wherein in the first step, the molded product is formed by injecting a molding material into the mold while the first mold component and the second mold component are arranged in the mold.

3. In the second step, the first opening is formed by separating the first mold component, which is positioned in the mold, from the mold. The molding method according to claim 2, wherein in the third step, the second opening is formed by separating the second mold component, which is positioned in the mold, from the mold.

4. The molding method according to claim 3, wherein the direction in which the first mold component is separated is different from the direction in which the second mold component is separated.

5. The molding method according to claim 3, wherein the first mold component and the second mold component are in contact with each other in a state in which they are arranged in the mold, so as to form the cavity.

6. In the first step described above, The portion of the runner formed near the first mold component is formed in such a way as not to hinder the separation of the first mold component from the mold. The portion of the runner formed near the second mold component is formed in such a way as not to hinder the separation of the second mold component from the mold. The molding method according to claim 3.

7. In the first step described above, The portion of the runner formed near the first mold component includes a first portion formed by bypassing the first mold component. The portion of the runner formed near the second mold component includes a second portion formed by bypassing the second mold component. The molding method according to claim 3.

8. In the first step described above, The portion of the runner formed near the first mold component includes a first portion formed to straddle the first mold component. The portion of the runner formed near the second mold component includes a second portion formed to straddle the second mold component. The molding method according to claim 3.

9. The molding method according to any one of claims 1 to 8, wherein the runner is not molded inside the first mold component and the second mold component.

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