KR20230002156U - undercut unit for injection mould - Google Patents

Abstract

The posted content is about an undercut unit for an injection mold for molding an injection molded product in which a hook is formed.
The undercut unit for an injection mold for forming a hook according to an embodiment of the present specification is
In the undercut unit for an injection mold for forming a hook on an injection mold formed by an upper and lower mold:
A housing that is mounted on the lower mold, has a first coupling groove formed through it in the vertical direction, has a second coupling groove formed through it while maintaining a right angle to the first coupling groove, and has a bottom plate mounted on the lower part of the first coupling groove. ;
a slider that is movably coupled to the first coupling groove and has an inclined sliding rail formed on one side in the vertical direction;
a moving unit that is guided by the sliding rail when the slider goes up and down and moves horizontally along the second coupling groove, and whose outer end moves toward the inside of the housing when the slider goes down;
An elastic member for elastically supporting the bottom surface of the slider to elastically bias the slider to its initial state when positioned at top dead center,
When the external force pressing the slider is removed by the upper and lower mold opening operation, the outer end of the moving unit moves in a direction away from the center of the housing as the slider is raised to top dead center by the elastic force of the elastic member. An undercut unit for an injection mold for forming a hook is provided as much as possible.

Description

Undercut unit for injection mold for forming hooks {undercut unit for injection mold}

This specification relates to an injection mold, and more specifically, to an undercut unit for an injection mold for molding an injection molded product in which a hook is formed.

Unless otherwise indicated herein, the material described in this section is not prior art to the claims of this application, and is not admitted to be prior art by inclusion in this section.

In general, injection molding is for molding and processing thermoplastic resins, etc., by injecting and filling molten resin at an appropriate temperature into the cavity of a mold forming the product shape at an appropriate pressure and speed, and then filling over a certain period of time. When the resin is cooled and solidified, the mold is opened and the molded product is taken out to manufacture the product.

The injection mold used in this type of injection molding opens and closes the cavity as the upper and lower molds move up and down, and there is an undercut (during the ejection process of the mold injection mold) where it is difficult to take out the injection mold only by moving the upper and lower molds in the closing or opening direction. (Referring to obstacles such as bumps or protrusions that make it difficult to separate the injection mold from the cavity), and due to the diversification of product design, such undercut shapes exist on the inside or outside of the injection mold, or in a penetrating shape.

For example, when molding a frame that forms the exterior of an electronic product as an example of an injection molded product, coupling protrusions and coupling holes, which are fastened using a hook method as coupling parts for coupling between the upper and lower frames, are formed correspondingly on both sides along the circumference of the frame. In particular, the through-formed coupling hole remains as an undercut part during the extraction process, so design to avoid this is necessary when manufacturing with an injection mold.

To solve this problem, undercuts were conventionally handled by dividing the mold into an upper core, a lower core, and a slide core, each of which operates independently in a different transfer direction.

That is, it is designed to avoid undercut areas at the start of the mold by providing a separate slide core for the undercut areas in the horizontal direction.

An injection mold with a structure for processing inner undercuts is registered in Korean Patent Publication No. 10-2131208.

The embodiments of the present specification are for molding a hook, which lowers the manufacturing cost and enables injection molding of good products due to slimming and miniaturization of the undercut unit for manufacturing the injection molded product with the hook. It is related to undercut unit for injection mold.

According to an embodiment of the present specification to achieve the above and other purposes of the present specification,

In the undercut unit for an injection mold for forming a hook on an injection mold formed by an upper and lower mold:

A housing that is mounted on the lower mold, has a first coupling groove formed through it in the vertical direction, has a second coupling groove formed through it while maintaining a right angle to the first coupling groove, and has a bottom plate mounted on the lower part of the first coupling groove. ;

a slider that is movably coupled to the first coupling groove and has an inclined sliding rail formed on one side in the vertical direction;

a moving unit that is guided by the sliding rail when the slider goes up and down and moves horizontally along the second coupling groove, and whose outer end moves toward the inside of the housing when the slider goes down;

An elastic member for elastically supporting the bottom surface of the slider to elastically bias the slider to its initial state when positioned at top dead center,

When the external force pressing the slider is removed by the upper and lower mold opening operation, the outer end of the moving unit moves in a direction away from the center of the housing as the slider is raised to top dead center by the elastic force of the elastic member. An undercut unit for an injection mold for forming a hook is provided as much as possible.

According to another embodiment of the present specification to achieve the above and other purposes of the present specification,

In the undercut unit for an injection mold for forming a hook on an injection mold formed by an upper and lower mold:

A housing that is mounted on the lower mold, has a first coupling groove formed through it in the vertical direction, has a second coupling groove formed through it while maintaining a right angle to the first coupling groove, and has a bottom plate mounted on the lower part of the first coupling groove. ;

a slider that is movably coupled to the first coupling groove and has an inclined sliding rail formed on one side in the vertical direction;

a moving unit that is guided by the sliding rail when the slider goes up and down and moves horizontally along the second coupling groove, and whose outer end moves toward the inside of the housing when the slider goes down;

An elastic member for elastically supporting the bottom surface of the slider to elastically bias the slider to its initial state when positioned at top dead center,

When the external force pressing the slider is removed by the upper and lower mold opening operation, the slider is raised to top dead center by the elastic force of the elastic member, so that the outer end of the moving unit moves toward the center of the housing. An undercut unit for an injection mold for forming a hook is provided.

The undercut unit for an injection mold for forming a hook according to an embodiment of the present specification having the above-described configuration has the following advantages.

Slimming and miniaturization of the undercut unit for producing injection molded products with hooks lowers manufacturing costs and allows for injection molding of good products, thereby improving productivity and reducing costs.

1 is a perspective view of an undercut unit for an injection mold for forming a hook according to a preferred embodiment of the present specification;
Figure 2 is a cross-sectional view of the undercut unit shown in Figure 1;
Figure 3 (a, b, c, d) is a state of use of the undercut unit shown in Figure 1,
Figure 4 is a perspective view of an undercut unit for an injection mold for forming a hook according to another preferred embodiment of the present specification;
Figure 5 is a cross-sectional view of the undercut unit shown in Figure 4;
Figure 6 (a, b, c, d) is a state diagram of the undercut unit shown in Figure 4.

Hereinafter, an undercut unit for an injection mold for forming a hook according to a preferred embodiment of the present specification will be described in detail with reference to the accompanying drawings.

Referring to Figures 1 to 3 (a, b, c, d), the undercut unit for an injection mold for forming a hook according to an embodiment of the present specification is

In the undercut unit for an injection mold for molding a hook on an injection molded product (as an example, but not limited to a frame forming the exterior of an electronic product) formed by an upper and lower mold:

It is mounted on the lower mold 10, and a first coupling groove 11 is formed through it in the up and down direction (vertical direction), and is maintained at a right angle to the first coupling groove 11, so that the second coupling groove 12 is formed in the left and right directions. A housing (14) formed through a (horizontal) direction and having a bottom plate (13) mounted on the lower portion of the first coupling groove (11);

A slider (16) that is movably coupled to the first coupling groove (11) and has an inclined sliding rail (15) formed on one side in the vertical direction;

When the slider (16) is lifted or lowered along the first coupling groove (11), it is guided by the sliding rail (15) and moves horizontally along the second coupling groove (12), but when the slider (16) is lowered, the outer end moves toward the housing (14). ) a mobile unit 17 moved toward the inside;

An elastic member 18 (for example, a compression coil spring is used) is provided to elastically support the bottom surface of the slider 16 and elastically bias the slider 16 positioned at top dead center to its initial state,

When the external force pressing the slider 16 is removed by the opening operation of the upper and lower molds 19 and 10, the slider 16 is raised to top dead center (initial position) by the elastic restoring force of the elastic member 18. Accordingly, the outer end of the moving unit 17 is horizontally moved in a direction away from the center of the housing 14.

According to a more preferred embodiment, one side is detachably connected to the aforementioned moving unit 17, and an undercut 22 corresponding to the undercut 21 formed on the inner surface of the injection molded product 20 is formed on the other side. It is characterized by having a slide core (23).

It is removably mounted on the upper mold 19 at a position opposite to the slider 16 described above, and is characterized by being provided with a washer 24 for adjusting the stroke of the slider 16.

It is characterized by having a T-shaped protrusion 25 formed on the outer end of the aforementioned moving unit 17, and a T-shaped groove 26 formed through the slide core 23 to correspond to the protrusion 25. Do it as

Hereinafter, an undercut unit for an injection mold for forming a hook according to an embodiment of the present specification will be described with reference to the accompanying drawings.

1 to 3 (a, b, c, d), the above-described lower mold 10 and upper mold 19 are opened and closed by conventional driving means, and the molten resin injected into the cavity 27 This makes it possible to mold the injection molded product 20.

At this time, when the undercut 21 is formed on one side of the injection molded product 20, the slide core 23 that is detachably connected to the moving unit 17 mounted on the lower mold 10 can be used.

The slide core 23 described above is for forming the undercut 21 of the injection molded product 20 between the upper mold 19 and the lower mold 10 (see Fig. 3(c, d)), and the injection molded product ( The horizontal direction of the undercut 21 of 20), that is, the direction (as an example) orthogonal to the moving direction (as an example, the vertical direction) of the upper mold 19 and the lower mold 10 , the slide core 23 can be moved an arbitrary distance by the moving unit 17 in the left and right direction (horizontal direction).

At this time, the moving unit 17 moves the elastic member 18 when external force (pressure) due to the lowering of the upper mold 19 is applied to the slider 16 in the vertical direction (vertical direction) or when the applied pressure is removed. Due to the elastic restoring force, the slider 16 can slide along the sliding rail 15 and enter and retreat in the left and right directions (horizontal direction) along the second coupling groove 12 of the housing 14.

Accordingly, the undercut 21 formed on the inner surface of the above-described injection molded product 20 can be molded by the slide core 23 on which the corresponding undercut 22 is formed.

In a state in which the slide core 23 is connected by mutual unevenness of the T-shaped protrusion 25 formed on the outer end of the above-described moving unit 17 and the T-shaped groove 26 formed to correspond thereto (FIG. 3(a) (Reference), the upper mold 19 is lowered in the vertical direction by a normal driving means (for example, a hydraulic cylinder may be used) and brought into close contact with the lower mold 10.

At this time, since the slider 16 is pressed in the vertical direction along the first coupling groove 11 of the housing 14 by the upper mold 19, the second coupling groove 12 communicated with the first coupling groove 11 The slide core 23 connected to the moving unit 17 that moves horizontally along ) is moved toward the inside of the housing 14 (at this time, the elastic member 18 is subjected to a compressive force).

A cavity 27 (shaded portion in FIG. 3(c)) containing the undercut 21 of the injection molded product 20 is formed between the slide core 23 and the upper mold 19 (FIG. 3(c) reference).

Therefore, when a normal molten resin is injected into the cavity 27 and curing is completed after a certain period of time, the upper mold 19 is separated upward from the lower mold 10 by a normal driving means (see Figure 3 (Figure 3). d) see).

At this time, the external force pressing the slider 16 in the vertical direction is removed due to the separation of the upper mold 19, so the bottom surface of the slider 16 is initially restored by the elastic restoring force of the elastic member 18 built into the housing 14. It is raised to the position (referred to as top dead center).

As a result, the moving unit 17 moves horizontally in a direction away from the center of the housing 14 by the structure of the sliding rail 15 of the slider 16.

At this time, when the upper mold 19 is lifted and lowered, the slider 16 is lifted vertically along the first coupling groove 11 of the housing 14, and the moving unit 17 coupled to the second coupling groove 12 And the slide core 23 is moved in the horizontal direction while maintaining a 90 angle with respect to the slider 16.

Accordingly, the slide core 23 detachably connected to the moving unit 17 moves horizontally in a direction away from the lower mold 10 (shown by an imaginary line in FIG. 3(d)), so that the slide core 23 The undercut 22 can be separated from the undercut 21 of the injection molding 20 without interference.

Therefore, the injection molded product 20 (shaded portion in FIG. 3(d)) with the undercut 21 formed on the inner side can be easily removed from the lower mold 10 using a typical separate extraction device (not shown). It becomes possible.

Meanwhile, the stroke of the slider 16 can be adjusted by the thickness of the washer 24 detachably mounted on the upper mold 19 opposite the upper surface of the slider 16.

The lower mold 10 and the upper mold 19 are opened and closed by lifting the upper mold 19 by a normal driving means (not shown), and a cavity of a predetermined shape formed between the upper and lower molds 19 and 10 in close contact ( 27), the technical content of molding a predetermined injection molded product 20 by injecting molten resin is commonly used in the technical field to which this specification pertains, so detailed descriptions of their configuration and operation will be omitted.

Referring to FIGS. 4 to 6 (a, b, c, d), the undercut unit for an injection mold for forming a hook according to another embodiment of the present specification is

In the undercut unit for an injection mold for molding a hook on an injection molded product (as an example, but not limited to a frame forming the exterior of an electronic product) formed by an upper and lower mold:

It is mounted on the lower mold 10, and a first coupling groove 11 is formed through it in the up and down direction (vertical direction), and is maintained at a right angle to the first coupling groove 11, so that the second coupling groove 12 is formed in the left and right directions. A housing (14) formed through a (horizontal) direction and having a bottom plate (13) mounted on the lower part of the first coupling groove (11);

A slider (16) that is movably coupled to the first coupling groove (11) and has an inclined sliding rail (15) formed on one side in the vertical direction;

When the slider (16) is lifted or lowered along the first coupling groove (11), it is guided by the sliding rail (15) and moves horizontally along the second coupling groove (12), but when the slider (16) is lowered, the outer end moves toward the housing (14). ) a mobile unit 17 moved toward the inside;

An elastic member 18 (for example, a compression coil spring is used) is provided to elastically support the bottom surface of the slider 16 and elastically bias the slider 16 positioned at top dead center to its initial state,

When the external force pressing the slider 16 is removed by the opening operation of the upper and lower molds 19 and 10, the slider 16 is raised to top dead center by the elastic restoring force of the elastic member 18, and the moving unit ( 17) It is characterized in that the outer end is moved toward the center of the housing 14.

According to a more preferred embodiment, one side is detachably connected to the aforementioned moving unit 17, and an undercut 23 corresponding to the undercut 21 formed on the outer surface of the injection molded product 20 is formed on the other side. Characterized by having a slide core (23)

At this time, in the undercut unit for an injection mold for forming a hook according to another embodiment of the present specification, the slider 16 forms the first coupling groove 11 of the housing 14 due to the pressure of the upper mold 19 described above. When descending in the vertical direction, the moving unit 17 guided by the inclined sliding rail 15 of the slider 16 moves horizontally in a direction away from the center of the housing 14 along the second coupling groove 12. The configuration of the undercut unit for an injection mold, except for moving, is applied substantially the same as the undercut unit for an injection mold according to an embodiment of the present specification, so detailed descriptions of their configuration and operation are omitted, and overlapping reference numbers are used. It means a configuration with the same function.

Therefore, according to the undercut unit for an injection mold for forming a hook according to another embodiment of the present specification, when the upper mold 19 is lowered by a normal driving means (not shown) and brought into close contact with the lower mold 10, Since the slider 16 is lowered along the first coupling groove 11 of the housing 14 and the moving unit 17 is horizontally moved toward the center of the housing 14 along the second coupling groove 12, the moving unit ( A cavity 27 is formed between the lower mold 10 and the upper mold 19 by moving the slide core 23 connected to 17).

Therefore, after molding the injection molded product 20 of a predetermined shape using molten resin that is injected into the cavity 27 and hardened, when the upper mold 19 is raised relative to the lower mold 10, the slider 16 is pressed. An external force is removed.

Due to this, the moving unit 17 is horizontally moved toward the center of the housing 14, so that the undercut 22 of the slide core 23 connected to the moving unit 17 is separated from the undercut 21 of the injection molded product 20.

At this time, when the upper mold 19 is lifted and lowered, the slider 16 is lifted vertically along the first coupling groove 11 of the housing 14, and the moving unit 17 coupled to the second coupling groove 12 And the slide core 23 is moved in the left and right directions while maintaining a 90 angle with respect to the slider 16.

Accordingly, the injection molded product 20 with the undercut 21 formed on the outer surface can be taken out without interference from the undercut 22 of the slide core 23 mounted on the lower mold 10.

Here, although the above-described specification has been described with reference to preferred embodiments, those skilled in the art may modify and modify the present specification in various ways without departing from the spirit and scope of the specification as set forth in the following claims. You will understand that you can change it.

10; lower mold
11; 1st joining groove
12; 2nd coupling groove
13; bottom plate
14; housing
15; sliding rail
16; slider
17; mobile unit
18; Elastic member
19; upper mold
20; injection molding
21; undercut
22; undercut
23; slide core
24; washer
25; projection part
26; Yohome

Claims (8)

In the undercut unit for an injection mold for forming a hook on an injection mold formed by an upper and lower mold:
A housing that is mounted on the lower mold, has a first coupling groove formed through it in the vertical direction, has a second coupling groove formed through it while maintaining a right angle to the first coupling groove, and has a bottom plate mounted on the lower part of the first coupling groove. ;
a slider that is movably coupled to the first coupling groove and has an inclined sliding rail formed on one side in the vertical direction;
a moving unit that is guided by the sliding rail when the slider goes up and down and moves horizontally along the second coupling groove, and whose outer end moves toward the inside of the housing when the slider goes down;
An elastic member for elastically supporting the bottom surface of the slider to elastically bias the slider to its initial state when positioned at top dead center,
When the external force pressing the slider is removed by the upper and lower mold opening operation, the outer end of the moving unit moves in a direction away from the center of the housing as the slider is raised to top dead center by the elastic force of the elastic member. An undercut unit for an injection mold for forming a hook, which is characterized by as much as possible. In the undercut unit for an injection mold for forming a hook on an injection mold formed by an upper and lower mold:
A housing that is mounted on the lower mold, has a first coupling groove formed through it in the vertical direction, has a second coupling groove formed through it while maintaining a right angle to the first coupling groove, and has a bottom plate mounted on the lower part of the first coupling groove. ;
a slider that is movably coupled to the first coupling groove and has an inclined sliding rail formed on one side in the vertical direction;
a moving unit that is guided by the sliding rail when the slider goes up and down and moves horizontally along the second coupling groove, and whose outer end moves toward the inside of the housing when the slider goes down;
An elastic member for elastically supporting the bottom surface of the slider to elastically bias the slider to its initial state when positioned at top dead center,
When the external force pressing the slider is removed by the upper and lower mold opening operation, the slider is raised to top dead center by the elastic force of the elastic member, so that the outer end of the moving unit moves toward the center of the housing. An undercut unit for an injection mold for forming a hook, characterized in that. According to paragraph 1,
An undercut unit for an injection mold for molding a hook, further comprising a slide core having one side detachably connected to the moving unit and having an undercut corresponding to an undercut formed on the inner surface of the injection molded product on the other side. . According to paragraph 2,
An undercut unit for an injection mold for molding a hook, further comprising a slide core, one side of which is detachably connected to the moving unit, and an undercut corresponding to an undercut formed on the outer surface of the injection molded product, which is formed on the other side. . According to paragraph 1,
An undercut unit for an injection mold for molding a hook, further comprising a washer mounted on the upper mold at a position opposite to the slider and for adjusting a stroke of the slider. According to paragraph 2,
An undercut unit for an injection mold for molding a hook, further comprising a washer mounted on the upper mold at a position opposite to the slider and for adjusting a stroke of the slider. According to paragraph 1,
An undercut unit for an injection mold for molding a hook, further comprising a T-shaped protrusion formed on an outer end of the moving unit, and a T-shaped groove formed on the slide core to correspond to the protrusion. According to paragraph 2,
An undercut unit for an injection mold for molding a hook, further comprising a T-shaped protrusion formed on an outer end of the moving unit, and a T-shaped groove formed on the slide core to correspond to the protrusion.

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