Slide mechanism

Abstract

To easily separate an inclined core from undercut structure of a molded product when ejecting the molded product.SOLUTION: A slide mechanism comprises an inclined core for performing undercut processing on molded products formed by injection molding, and the inclined core comprises ejector pins configured to separate the undercut structure of a molded product from the inclined core when the molded product is ejected.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a slide mechanism and a mold, and more particularly, to a slide mechanism and a mold for molding a molded product having a complex undercut structure.

Background Art

[0002] Injection molding is known as one of the related manufacturing techniques for manufacturing molded parts (referred to as molded products) from materials such as synthetic resins.

[0003] In related technologies, molding is performed by melting a material by heating, feeding the molten material into a mold, and cooling the material within the mold. The molded product is removed from the mold by an ejector mechanism such as an ejector pin and an ejector plate.

[0004] Some molded products have an undercut structure provided therein.

[0005] In the related technology described in Patent Document 1, an undercut process is performed using an inclined slide mechanism. Specifically, in the related technology described in Patent Document 1, an undercut structure of a molded product is formed by an inclined core (also referred to as a loose core) supported by a mold.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] When a molded product has a complex undercut structure, the inclined core adheres tightly to the undercut structure during mold closing. When the mold opens, the inclined core may not be able to separate from the undercut structure, which can result in deformation of the molded product during ejection.

[0008] This disclosure has been made in view of the above-mentioned problems, and its purpose is to facilitate the separation of the inclined core from the undercut structure of the molded product during ejection of the molded product. [Means for solving the problem]

[0009] A slide mechanism according to one aspect of the present disclosure includes an inclined core for performing an undercut treatment on an injection-molded product, the inclined core includes ejector pins configured to separate the undercut structure of the molded product from the inclined core when the molded product is ejected.

[0010] A mold according to one aspect of the present disclosure is a mold for injection molding, comprising a slide mechanism, the slide mechanism comprising an inclined core for performing an undercut treatment on a molded product by injection molding, and the inclined core comprising ejector pins configured to separate the undercut structure of the molded product from the inclined core when the molded product is ejected. [Effects of the Invention]

[0011] According to one aspect of this disclosure, it is possible to easily detach the inclined core from the undercut structure of the molded product when the molded product is ejected. [Brief explanation of the drawing]

[0012] [Figure 1] This is an external view of an example of a molded product produced by injection molding. [Figure 2] This is an external view of an example of a molded product produced by injection molding. [Figure 3] This figure shows an example of undercutting using angled pins. [Figure 4]It is a diagram showing an example of a slide mechanism according to an embodiment. [Figure 5] It is a diagram showing an example of a slide mechanism according to an embodiment. [Figure 6] It is a diagram showing an example of a molded product formed by a slide mechanism according to an embodiment. [Figure 7] It is a diagram showing an example of a protruding product provided with an inclined core according to an embodiment. [Figure 8] It is a diagram showing an example of a protruding product provided with an inclined core according to an embodiment.

Mode for Carrying Out the Invention

[0013] Some embodiments of the present disclosure will be described below with reference to the drawings.

[0014] 〔Embodiment 1〕 Embodiment 1 of the present disclosure will be described with reference to FIGS. 1 to 8.

[0015] (Example of a Molded Product by Injection Molding) FIG. 1 is an external view of an example of a molded product 100 (molded product) by injection molding. As shown in FIG. 1, an example of the molded product 100 is composed of three U-shaped surfaces. For example, the molded product 100 is formed of a material such as synthetic resin.

[0016] FIG. 2 shows the molded product 100 with the top and bottom reversed. As shown in FIG. 2, an undercut structure 110 is formed on the inner surface of the molded product 100. The undercut structure 110 means a portion that cannot be脱模 in the opening and closing direction of the mold when removing the molded product 100 from the mold.

[0017] The undercut structure 110 is脱模 from the mold by an undercut process using, for example, a slide core, an inclined core, or a hydraulic cylinder.

[0018] Referring to FIG. 3, an example of an undercut process using the inclined core 200 will be described. FIG. 3 shows a partial cross-section of the molded product 100 shown in FIGS. 1 and 2. In FIG. 3, the inclined core 200 is in a state before the molded product 100 protrudes (i.e., before the molded product 100 is separated from the mold).

[0019] In the example shown in FIG. 3, the inclined core 200 is molding a portion corresponding to the undercut structure 110 of the molded product 100. The arrow shown in FIG. 3 indicates the direction of the protruding force acting on the inclined core 200 when the molded product 100 protrudes (i.e., after mold opening and when the molded product 100 is removed from the mold).

[0020] When the molded product 100 protrudes, the inclined core 200 moves in the diagonally downward direction in the figure to push out the molded product 100. Thereby, the molded product 100 is separated from the mold. At the same time, the inclined core 200 moves in the right direction in the figure to separate from the undercut structure 110.

[0021] (An example of the undercut process by the slide mechanism 10) Referring to FIGS. 4 to 6, an example of the undercut process by the slide mechanism 10 according to Embodiment 1 will be described. FIGS. 4 and 5 are cross-sectional views of the molded product 100.

[0022] FIG. 4 shows the states of the inclined core 200 and the slide core 3 before the protruding operation. As shown in FIG. 4, before the protruding operation, the inclined core 200 and the slide core 3 are in contact with the undercut structure 110 of the molded product 100. The inclined core 200 is in contact with the undercut structure 110 of the molded product 100 from the inside of the molded product 100, and the slide core 3 is in contact with the undercut structure 110 of the molded product 100 from the outside of the molded product 100.

[0023] Figure 5 shows the state of the inclined core 200 and the slide core 300 during ejection. As indicated by the arrows in Figure 5, during ejection, the slide core 300 moves (slides) away from the molded product 100. At this time, an ejection force is applied to the inclined core 200. The ejection force acting on the inclined core 200 is decomposed into a force that pushes the molded product 100 upwards in the figure and a force that separates the undercut structure 110 from the inclined core 200.

[0024] Furthermore, ejector pins 220 (described later) provided on the inclined core 200 apply force to the undercut structure 110 of the molded product 100, and the reaction force of this force is applied to the inclined core 200 as a force that separates the undercut structure 110 from the inclined core 200. As a result, the molded product 100 is pulled away from the mold.

[0025] Figure 6 shows an example of an undercut structure 110 formed on the molded product 100 as a result of the undercut process described with reference to Figures 4 and 5. The undercut structure 110 shown in Figure 6 is provided, for example, on the case of an electronic device for the purpose of heat dissipation.

[0026] (An example of a 220 ejector pin) Referring to Figures 7 and 8, an example of an ejector pin 220 that exerts a force to peel the undercut structure 110 from the inclined core 200 during the ejection process of the undercut treatment will be described.

[0027] Figure 7 shows the state of the ejector pin 220 before the ejection operation. As shown in Figure 7, the ejector pin 220 is attached to the inclined core 200 by fixing parts 210 such as countersunk screws. The ejector pin 220 has a compression spring 221. One end a of the ejector pin 220 is in contact with the mold, and the other end b of the ejector pin 220 is in contact with the molded product 100.

[0028] Figure 8 shows the state of the ejector pin 220 during ejection. During ejection, the ejector pin 220 moves (slides) together with the inclined core 200, but the distance from one end a of the ejector pin 220 that is in contact with the mold to the other end b of the ejector pin 220 that is in contact with the molded product 100 is kept constant by the elasticity of the compression spring 221.

[0029] During ejection, the ejection force acting on the inclined core 200 causes it to move away from the undercut structure 110 of the molded product 100. However, if the inclined core 200 is entangled with a complex undercut structure 110, the ejection force acting on the inclined core 200 alone is insufficient to separate the inclined core 200 from the undercut structure 110, and the undercut structure 110 tends to be dragged in the direction in which the inclined core 200 moves.

[0030] At this time, a force is applied to the compression spring 221 of the ejector pin 220 from the molded product 100, with the point of application being one end b of the compression spring 221 that is in contact with the molded product 100. As a result, the compression spring 221 is compressed, and a restoring force is exerted on the compression spring 221 so as to move the undercut structure 110 away from the inclined core 200. In other words, the restoring force of the compression spring 221 biases the ejector pin 220 against the molded product 100.

[0031] As a result, in addition to the protruding force applied to the inclined core 200, the restoring force of the compression spring 221 pulls the undercut structure 110 away from the inclined core 200.

[0032] (Effects of this embodiment) According to one aspect of this embodiment, the slide mechanism 10 includes an inclined core 200 for performing an undercut treatment on a molded product 100 by injection molding, and the inclined core 200 includes ejector pins 220 configured to pull away the undercut structure 110 of the molded product 100 from the inclined core 200 when the molded product 100 is ejected.

[0033] During the ejection phase, the undercut structure 110 is pulled away from the inclined core 200 by the ejection force applied to the inclined core 200, in addition to the force exerted by the ejection pin 220.

[0034] This makes it easier to detach the inclined core 200 from the undercut structure 110 of the molded product 100 when the molded product 100 is ejected.

[0035] [Embodiment 2] This second embodiment describes an example of a mold for injection molding.

[0036] The mold according to this second embodiment is a mold for injection molding and includes a slide mechanism 10 (Figure 4). The slide mechanism 10 includes an inclined core 200 for performing an undercut treatment on a molded product 100 by injection molding, and the inclined core 200 includes ejector pins 220 configured to pull the undercut structure 110 of the molded product 100 away from the inclined core 200 when the molded product 100 is ejected.

[0037] During the ejection phase, the undercut structure 110 is pulled away from the inclined core 200 by the ejection force applied to the inclined core 200, in addition to the force exerted by the ejection pin 220.

[0038] This makes it easier to detach the inclined core 200 from the undercut structure 110 of the molded product 100 when the molded product 100 is ejected.

[0039] (Note) Some or all of the above embodiments may also be described as follows, but are not limited to the following:

[0040] (Note 1) The injection-molded product is equipped with an inclined core for applying an undercut. The inclined core is equipped with ejector pins configured to separate the undercut structure of the molded product from the inclined core when the molded product is ejected. Sliding mechanism.

[0041] (Note 2) When the molded product is ejected, the inclined core slides along the surface of the mold, and the ejector pin biases the molded product, thereby separating the undercut structure of the molded product from the inclined core. The slide mechanism described in Appendix 1, characterized by the features described herein.

[0042] (Note 3) The aforementioned ejector pin has a compression spring, As the inclined core slides along the surface of the mold, the compression spring is compressed, and the restoring force of the compression spring biases the ejector pin relative to the molded product. The slide mechanism described in Appendix 2, characterized by the features described herein.

[0043] (Note 4) The molded product is further provided with a slide core on the opposite side of the inclined core for performing an undercut process, Before the molded product is ejected, the slide core is configured to move away from the undercut structure of the molded product. A slide mechanism as described in any one of the appendices 1 to 3, characterized by the features described herein.

[0044] (Note 5) A mold for injection molding, Equipped with a sliding mechanism, The aforementioned slide mechanism is The injection-molded product is equipped with an inclined core for applying an undercut. The inclined core includes ejector pins configured to separate the undercut structure of the molded product from the inclined core when the molded product is ejected. Mold.

[0045] The present disclosure has been described above with reference to several embodiments. However, the present disclosure is not limited to the embodiments described above. Each embodiment can be combined with other embodiments as appropriate. Furthermore, various modifications to the configuration and details of the above embodiments can be made that will be understood by those skilled in the art within the scope of the present disclosure. [Industrial applicability]

[0046] This disclosure can be used, for example, for undercut treatment in injection molding. [Explanation of Symbols]

[0047] 10. Slide mechanism 100 Molded products 110 Undercut structure 200 Inclined Core 210 Fixing parts 220 Protruding pins 221 Compression spring

Claims

[Claim 1] The injection-molded product is equipped with an inclined core for applying an undercut. The inclined core is equipped with ejector pins configured to separate the undercut structure of the molded product from the inclined core when the molded product is ejected. A sliding mechanism in which, when the inclined core slides along the surface of the mold during ejection of the molded product, the ejector pin biases the molded product, thereby pulling the undercut structure of the molded product away from the inclined core, The ejector pin and the inclined core are in contact with the same compression spring from opposite directions. As the inclined core slides along the surface of the mold, the compression spring is pushed by the inclined core, and the compression spring is compressed, causing the compression spring to push the ejector pin, and a reaction force is applied to the inclined core. The molded product is further provided with a slide core on the opposite side of the inclined core for performing an undercut process, Before the ejection of the molded product, the slide core is configured to separate from the undercut structure of the molded product. Sliding mechanism.

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