Sliding mechanism and mold

Abstract

A sliding mechanism and a mold. The slide mechanism includes a pitched roof for applying an undercut process to a molded product obtained by injection molding, where the pitched roof includes a protruding pin configured to separate an undercut structure of the molded product from the pitched roof when the molded product protrudes.

Description

[0001] This application is based on and claims the benefit of priority of Japanese Patent Application No. 2023-175755, filed on Oct. 11, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] The present disclosure relates to a sliding mechanism and a mold, for example, a sliding mechanism and a mold for molding a molded product having a complex undercut structure. Background Art

[0003] 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.

[0004] In the related art, the material is melted by heating, the melted material is fed into the mold, and the material is cooled in the mold to perform molding. The molded product is separated from the mold by an ejector mechanism such as an ejector pin and an ejector plate.

[0005] Some molded products are provided with an undercut structure.

[0006] In the related art described in JP H7-32425A (Japanese Patent Application Laid-Open No. 1995-32425), an inclined sliding mechanism is used to perform an undercut process. Specifically, in the related art described in JP H7-32425A, the undercut structure of the molded product is formed by a lifter slide (also referred to as a loose core) supported by the mold.

[0007] When the molded product is provided with an undercut structure having a complex shape, when the mold is closed, the lifter slide is in close contact with the undercut structure. When the mold is opened, the lifter slide cannot be separated from the undercut structure, and thus, the molded product may be deformed when protruding. Summary of the Invention

[0008] In view of the above problems, the present disclosure is proposed, and an object of the present disclosure is to facilitate the separation of the lifter slide from the undercut structure of the molded product when the molded product protrudes.

[0009] A sliding mechanism according to one aspect of the present disclosure includes a lifter slide for applying an undercut process to a molded product obtained by injection molding, wherein the lifter slide includes a protruding pin configured to separate the undercut structure of the molded product from the lifter slide when the molded product protrudes.

[0010] A mold according to one aspect of the present disclosure includes a sliding mechanism, wherein the sliding mechanism includes a lifter slide for applying an undercut process to a molded product obtained by injection molding, and the lifter slide includes a protruding pin configured to separate the undercut structure of the molded product from the lifter slide when the molded product protrudes.

[0011] According to one aspect of the present disclosure, when the molded product is protruded, the sloped roof may be easily separated from the undercut structure of the molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Exemplary features and advantages of the present disclosure will become apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0013] Figure 1 is an external view of an example of a molded product formed by injection molding;

[0014] Figure 2 is an external view of an example of a molded product formed by injection molding;

[0015] Figure 3 is a view showing an example of an undercutting process using an inclined pin;

[0016] Figure 4 is a view showing an example of a sliding mechanism according to an exemplary embodiment;

[0017] Figure 5 is a view showing an example of a sliding mechanism according to an exemplary embodiment;

[0018] Figure 6 is a view showing an example of a molded product formed by a sliding mechanism according to an exemplary embodiment;

[0019] Figure 7 is a view showing an example of a protruding product included in a tilted roof according to an exemplary embodiment; and

[0020] Figure 8 is a view illustrating an example of a protruding product included in a tilted roof according to an exemplary embodiment. DETAILED DESCRIPTION

[0021] Some exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0022] [First exemplary embodiment]

[0023] Will refer to Figures 1 to 8 A first exemplary embodiment of the present disclosure is described.

[0024] (Example of a molded product formed by injection molding)

[0025] Figure 1 1 is an external view of an example of a molded product 100 (molded product) obtained by injection molding. Figure 1 As shown, an example of the molded product 100 includes three surfaces in a U-shape. For example, the molded product 100 is formed of a material such as a synthetic resin.

[0026] Figure 2 shows the molded product 100 in an inverted and flipped state. As Figure 2 shown, 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 released in the mold opening / closing direction when the molded product 100 is removed from the mold.

[0027] The undercut structure 110 is released from the mold by using an undercut process such as a slide core, a lifter, a hydraulic cylinder, etc.

[0028] An example of the undercut process using the lifter 200 will be described with reference to Figure 3 the following. Figure 3 shows Figure 1 and Figure 2 a cross-section of a part of the molded product 100 shown in Figure 3 . In

[0029] In Figure 3 the example shown, the lifter 200 forms a portion corresponding to the undercut structure 110 of the molded product 100. Figure 3 The arrow shown in

[0030] indicates the direction of the protruding force acting on the lifter 200 when the molded product 100 protrudes (i.e., when the molded product 100 is separated from the mold after the mold is opened).

[0031] When the molded product 100 protrudes, the lifter 200 tilts downward in the figure to push out the molded product 100. As a result, the molded product 100 is separated from the mold. At the same time, the lifter 200 moves away from the undercut structure 110 in the right direction of the figure.

[0032] An example of the undercut process of the slide mechanism 10 according to the first exemplary embodiment will be described with reference to Figures 4 to 6 the following. Figure 4 and Figure 5 are cross-sectional views of the molded product 100.

[0033] Figure 4 shows the states of the lifter 200 and the slide core 300 before the protruding operation. As Figure 4 shown, the lifter 200 and the slide core 300 are in contact with the undercut structure 110 of the molded product 100 before the protruding operation. The lifter 200 contacts the undercut structure 110 of the molded product 100 from the inside of the molded product 100, while the slide core 300 contacts the undercut structure 110 of the molded product 100 from the outside of the molded product 100.

[0034] Figure 5 shows the states of the lifter 200 and the slide core 300 at the moment of protrusion. As Figure 5 shown by the arrow in [reference], at the moment of protrusion, the slide core 300 moves (slides) in the direction away from the molded product 100. At this time, a protrusion force is applied to the lifter 200. The protrusion force acting on the lifter 200 is decomposed into a force for pushing the molded product 100 upward in the figure and a force for separating the undercut structure 110 from the lifter 200.

[0035] In addition, a protrusion pin 220 (described later) provided on the lifter 200 applies a force to the undercut structure 110 of the molded product 100, and the reaction force of this force is applied to the lifter 200 as a force for peeling the undercut structure 110 from the lifter 200. As a result, the molded product 100 is separated from the mold.

[0036] Figure 6 shows as a reference Figure 4 and Figure 5 an example of the undercut structure 110 formed in the molded product 100 as a result of the undercut process described. Figure 6 The undercut structure 110 shown is used for heat dissipation in the case of an electronic device, for example.

[0037] (Example of the protrusion pin 220)

[0038] will refer to Figure 7 and Figure 8 to describe an example of the protrusion pin 220 that applies a force for peeling the undercut structure 110 from the lifter 200 at the moment of protrusion during the undercut process.

[0039] Figure 7 shows the state of the protrusion pin 220 before the protrusion operation. As Figure 7 shown, the protrusion pin 220 is attached to the lifter 200 by a fixing member 210 such as a countersunk head screw. The protrusion pin 220 has a compression spring 221. One end a of the protrusion pin 220 contacts the mold, and the other end b of the protrusion pin 220 contacts the molded product 100.

[0040] Figure 8 shows the state of the protrusion pin 220 at the moment of protrusion. At the moment of protrusion, the protrusion pin 220 moves (slides) together with the lifter 200, but the distance from one end a of the protrusion pin 220 that contacts the mold to the other end b of the protrusion pin 220 that contacts the molded product 100 is kept constant by the elasticity of the compression spring 221.

[0041] At the protruding moment, the lifter 200 moves in a direction away from the undercut structure 110 of the molded product 100 by the protruding force acting on the lifter 200. However, when the lifter 200 is entangled with the complex undercut structure 110, the lifter 200 cannot be separated from the undercut structure 110 only by the protruding force acting on the lifter 200, and the undercut structure 110 tends to be dragged in the direction in which the lifter 200 moves.

[0042] At this time, a force is applied to the compression spring 221 of the protruding pin 220 from the molded product 100, and one end b of the compression spring 221 that contacts the molded product 100 serves as the point of action. Therefore, the compression spring 221 is compressed, so that the compression spring 221 applies a restoring force to separate the undercut structure 110 from the lifter 200. In other words, the protruding pin 220 is biased against the molded product 100 by the restoring force of the compression spring 221.

[0043] Therefore, in addition to the protruding force applied to the lifter 200, the undercut structure 110 is pulled away from the lifter 200 by the restoring force of the compression spring 221.

[0044] (Effect of the present exemplary embodiment)

[0045] According to one aspect of the present exemplary embodiment, the sliding mechanism 10 includes a lifter 200 for applying an undercut process to a molded product 100 formed by injection molding, and the lifter 200 includes a protruding pin 220 configured to separate the undercut structure 110 of the molded product 100 from the lifter 200 when the molded product 100 protrudes.

[0046] When protruding, in addition to the protruding force applied to the lifter 200, the undercut structure 110 is also pulled away from the lifter 200 by the force applied by the protruding pin 220.

[0047] Therefore, when the molded product 100 protrudes, the lifter 200 can be easily separated from the undercut structure 110 of the molded product 100.

[0048] [Second Exemplary Embodiment]

[0049] In the second exemplary embodiment, an example of a mold for injection molding will be described.

[0050] The mold according to the second exemplary embodiment is a mold for injection molding and includes a sliding mechanism 10 ( Figure 4 ). The sliding mechanism 10 includes a lifter 200 for applying an undercut process to a molded product 100 formed by injection molding, and the lifter 200 includes a protruding pin 220 configured to separate the undercut structure 110 of the molded product 100 from the lifter 200 when the molded product 100 protrudes.

[0051] When protruding, in addition to the protruding force applied to the lifter 200, the undercut structure 110 is pulled away from the lifter 200 by the force applied by the protruding pin 220.

[0052] Therefore, when the molded product 100 protrudes, the lifter 200 can be easily separated from the undercut structure 110 of the molded product 100.

[0053] (Supplementary description)

[0054] Some or all of the above exemplary embodiments may be described as the following supplementary description, but are not limited to the following.

[0055] (Supplementary description 1)

[0056] A sliding mechanism, comprising:

[0057] A lifter for applying an undercut process to a molded product obtained by injection molding,

[0058] wherein the lifter includes a protruding pin configured to separate the undercut structure of the molded product from the lifter when the molded product protrudes.

[0059] (Supplementary description 2)

[0060] The sliding mechanism according to Supplementary description 1, wherein

[0061] when the lifter slides along the surface of the mold at the moment when the molded product protrudes, the protruding pin is biased against the molded product to separate the undercut structure of the molded product from the lifter.

[0062] (Supplementary description 3)

[0063] The sliding mechanism according to Supplementary description 2, wherein

[0064] the protruding pin includes a compression spring; and

[0065] when the lifter slides along the surface of the mold, the compression spring is compressed so that the protruding pin is biased against the molded product by the restoring force of the compression spring.

[0066] (Supplementary description 4)

[0067] The sliding mechanism according to any one of Supplementary descriptions 1 to 3, further comprising:

[0068] A sliding core for applying an undercut process to the molded product from a side opposite to the lifter,

[0069] Wherein, the sliding core is configured to separate from the undercut structure of the molded product before the molded product protrudes.

[0070] (Supplementary Note 5)

[0071] A mold for injection molding, comprising:

[0072] A sliding mechanism,

[0073] Wherein the sliding mechanism includes:

[0074] A lifter, the lifter being used to apply an undercut process to a molded product obtained by injection molding; and

[0075] The lifter includes a protruding pin configured to separate the undercut structure of the molded product from the lifter when the molded product protrudes.

[0076] The foregoing description of the embodiments is provided to enable those skilled in the art to make and use the present disclosure. In addition, various modifications to these exemplary embodiments will be apparent to those skilled in the art, and the general principles and specific examples defined herein can be applied to other embodiments without the use of creative faculty. Accordingly, the present disclosure is not intended to be limited to the exemplary embodiments described herein, but is to be accorded the widest scope defined by the limitations of the claims and equivalents.

[0077] In addition, it should be noted that the inventors intend to retain all equivalents of the claimed invention, even if the claims are modified during examination.

[0078] For example, the present disclosure can be used in the undercut process in injection molding.

Claims

1. A sliding mechanism, comprising: A lifter, the lifter being configured to apply an undercut process to a molded product obtained by injection molding, wherein the lifter includes a protruding pin configured to separate an undercut structure of the molded product from the lifter when the molded product protrudes.

2. The sliding mechanism according to claim 1, wherein, when the lifter slides along the surface of the mold at the moment when the molded product protrudes, the protruding pin is biased against the molded product to separate the undercut structure of the molded product from the lifter.

3. The sliding mechanism according to claim 2, wherein, the protruding pin includes a compression spring, and when the lifter slides along the surface of the mold, the compression spring is compressed so that the protruding pin is biased against the molded product by the restoring force of the compression spring.

4. The sliding mechanism according to any one of claims 1-3, further comprising: A sliding core, the sliding core being configured to apply an undercut process to the molded product from a side opposite to the lifter, wherein the sliding core is configured to separate from the undercut structure of the molded product before the molded product protrudes.

5. A mold for injection molding, comprising: A sliding mechanism, wherein the sliding mechanism includes: A lifter, the lifter being configured to apply an undercut process to a molded product obtained by injection molding; and the lifter includes a protruding pin configured to separate an undercut structure of the molded product from the lifter when the molded product protrudes.

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