KR20200038010A - Device for changing cores for molding dies - Google Patents

Abstract

The present invention proposes a device for easily exchanging cores for molding dies. The device for exchanging cores according to the present invention comprises: a coupler (26) supported to move in a horizontal direction inside a molding die and having a coupling protrusion (26a) capable of being coupled to a coupling hole (10a) of a core at an end of an inner side; and a horizontal moving means for moving the coupler (26) in a horizontal direction. Here, the coupling protrusion (26a) and the coupling hole (10a) are formed to have an inclination in which an outer side is high and an inner side is low. And, if the coupling protrusion (26a) of the coupler (26) breaks away from the coupling hole (10a) through the horizontal moving means, the core (10) may be separated from the coupling hole (Ma) of the molding die to mount another core into the coupling hole. Further, if the coupler (26) moves to an inner side, the core (10) may ascend to be coupled with the coupler (26) through a slope direction of the coupling protrusion (26a) and the coupling hole (10a). And, if the coupler (26) moves to an outer side, the core (10) may descend to be separated from the coupler (26) through a slope direction of the coupling protrusion (26a) and the coupling hole (10a).

Description

Device for changing cores for injection molds {Device for changing cores for molding dies}

The present invention relates to a core exchange device for an injection mold, and more particularly, to a core exchange device for an injection mold capable of producing a product having a clean appearance by preventing a parting line from being formed on the surface of a product produced by injection. .

In the field of injection molds, it is common to use a core, which is widely used when producing different products that have partially different shapes. For example, as shown in (a) and (b) of FIG. 1, when most of the shapes are the same, but a very small portion (refer to the product shape inside the circle), a part of the mold is composed of a core and these cores are It is common to perform injection molding by exchanging (Change).

As shown in Fig. 1, (a) the product has a hole for mounting other parts, but (b) the product does not need to form a hole because there is no need to mount other parts. In this case, it is common to make a part corresponding to the hole of the product among the molds as a core, so that a product is formed with a hole according to the shape of the core during injection molding, and a product without a hole can be produced in the same mold.

It should be noted that, in the mold of the exchange core method, according to the design method of the exchange core, a parting line occurring between the core and the mold may be formed on the surface of the product made of resin. For example, if the portion formed by the core is the main exposed portion of the product, the occurrence of such a dividing line may be a factor that decreases the value of the product.

It can be said that the object of the present invention is to provide an injection mold core exchange device in which no dividing line is generated in a product.

The object of the present invention can be said to mean that the surface of the product to be actually manufactured is formed most cleanly, or to increase the value in terms of the appearance or design of the product.

Another object of the present invention is to provide a core exchange device that is easy to exchange even without disassembling the mold.

The core exchange device of the present invention is for forming a part of a cavity molded by a plurality of molds, and changing the shape of a part of the cavity by exchange, for exchanging a core moving up and down in the cavity of a mold will be. And it is supported so as to be movable in the horizontal direction from the inside of the mold, the inner end having a coupler having a coupling protrusion that can be coupled to the coupling hole of the core; It is composed of horizontal moving means for moving the coupler in the horizontal direction. Here, the engaging projection and the engaging hole are molded to have a high outer side and a low inner side slope. In addition, when the coupling protrusion of the coupler deviates from the coupling hole of the core by the horizontal moving means, the core is separated from the coupling hole of the mold and the other core can be mounted on the coupling hole. Also, when the coupler moves inward, the core is coupled with the coupler while rising by the inclined direction of the engaging projection and the engaging hole. And when the coupler moves outward, the core may be separated from the coupler while descending by the inclined direction of the coupling protrusion and the coupling hole.

According to an embodiment of the horizontal moving means of the present invention, a screw coupling block supported by a mold, an outer surface is screwed to be screwed with a screw coupling block, and an inner end is formed of an adjustment screw connected to interlock with the coupling. According to this configuration, the rotation of the adjusting screw is converted into a linear movement to the inside and outside of the mold by the screwing block. And this movement substantially moves the core up and down.

According to another embodiment, when the coupler horizontally moves to the outside so that the coupling protrusion of the coupler is separated from the coupling hole of the core, it further includes a stopper that prevents further movement by contacting the coupler.

According to another embodiment, it is further configured to further include a vertical guide and a horizontal guide for guiding the vertical movement of the core and the horizontal movement of the coupler, respectively.

According to the present invention having the above configuration, when a core used to form a hole in a part of the product is used, a parting line is not formed on the outer surface of the product, so that the surface of the product can be completed beautifully. This will ultimately lead to an effect that increases the reliability of the product's exterior design.

In addition, according to the present invention, even if the entire mold, which is usually composed of a plurality, is not disassembled, the core can be easily exchanged, and thus an advantageous advantage in changing the model of the product is expected. It is expected that this will ultimately be an advantage of improving productivity.

1 is an exemplary view illustrating a product produced using an exchange core.
Figure 2 is an exemplary perspective view of the core exchange device of the present invention.
3 is an exemplary view showing a process of exchanging cores.

Hereinafter, with reference to the embodiment shown in the drawings, the core exchange device of the present invention will be described in detail.

1 is an example for more easily explaining the exchange device (C) of the present invention, and shows the product (P) instead of the cavity formed inside the mold to aid understanding. That is, it can be seen that the product P is substantially corresponding to the cavity, and the core exchange device C is installed in the mold M at the same time as being the upper part of the product P corresponding to the cavity. . And the mold (P) in the present invention can be said to mean any one of a number of substantially forming a cavity for producing a product (P), for example, it is also possible to be installed on a movable mold, fixed mold It is also possible to be installed on.

The product P produced by the exchange device of the present invention has, for example, a hole Pa on one side, as described above. In addition, the core 10 constitutes a part of the mold to mold a product having a hole Pa. And when the exchange device (C) of the present invention described below is replaced with another core, a product (P) partially having a different shape without a hole (Pa) can be injection molded.

Here, the core 10 can be moved in the up and down direction on the drawing, and when the injection molding is performed in a state in which the lower end protrudes to form a hole Pa of the product by moving downward, the hole Pa is as shown. Eggplant products are molded. That is, in the illustrated state, it can be said that the bottom portion of the core 10 forms a part of the cavity.

And Figure 3 shows the process of exchanging the core in the exchange device of the present invention, the one shown above is a perspective view, the one shown below is a longitudinal cross-sectional view. As can be seen with reference to FIGS. 2 and 3, the inclined coupling protrusion 26a of the coupler 26 is coupled to the inclined coupling hole 10a formed in the middle of the core 10. The engaging projection 26 is formed to be inclined downward (direction toward the cavity), and the engaging hole 10a is correspondingly high toward the coupler 26 side and has a lower slope toward the free end.

Here, the state shown in (a) of FIG. 3 can be said to be that the core 10 is in a fully coupled state with the coupler 26. In this state, as shown in (b), when the coupler 26 moves to the left side (outside of the mold) in the drawing, the engaging projection 26a is released from the engaging hole 10a. 10) can be separated from the mold. Thus, it can be seen that the direction in which the core 10 is separated is actually a cavity direction, and the core 10 can be sufficiently exchanged without disassembling the entire mold.

And as described above, in order to separate the core 10 from the coupler 26, the coupler 26 must move in the horizontal direction, and when the coupling with the coupler 26 is released, the core 10 is separated in the vertical direction. Able to know. In the coupled state, it can be seen that the coupling protrusion 26a of the coupler 26 and the coupling hole 10a of the core 10 have a slope.

Next, the mechanism for moving the coupler 26 in the horizontal direction will be described. It is natural that the mechanism for moving the coupler 26 installed inside the mold M in the horizontal direction may have various configurations, and hereinafter, the adjustment screw 20 extending outward of the mold A description will be given of an embodiment using.

An adjustment screw 20 is connected to the outside (outside of the mold) of the coupler 26 described above. The adjustment screw 20 and the coupler 26 are sufficient to be installed to interlock with each other in the horizontal direction, and in the illustrated embodiment, the extended inner head 20a of the adjustment screw 20 has a support groove of the coupler 26 It has a configuration that is inserted into (26b) and engaged with each other. And the thread is machined on the outer surface of the adjusting screw 20, and the adjusting screw 20 passes through the screwing block 22 which is fixed to the mold (M).

Therefore, when the adjusting screw 20 is rotated using the operation portion 20c extending outward of the mold M, a linear reciprocating motion is possible in a horizontal direction with respect to the fixed screw coupling block 22. It is natural that the horizontal linear motion of the adjustment screw 20 is substantially connected to the linear reciprocating motion of the coupler 26. And, as described above, the horizontal movement of the coupler 26 is related to the disassembly of the core 10.

That is, as shown in Fig. 3 (b), when the coupler 26 is completely moved to the outside of the mold (left in the figure) through the adjusting screw 20, the coupling relationship between the coupler 26 and the core 10 Is released. In this state, the core 10 may be disassembled in the cavity direction from the coupling hole Ma of the mold M, and as shown in (c), the new core 10K may be the coupling hole of the mold M ( Ma).

And when the coupling hole (10a) of the inserted new core (10K) and the coupling protrusion (26a) of the coupler (26) are matched, when the adjusting screw (20) is rotated in the opposite direction, as shown in (d) As the new core 10K rises along the inclined direction, the coupling hole 10a and the coupling protrusion 26a are completely combined with each other, and it can be seen that substantially (d) is in the same state as (a).

Guide mechanisms for accurately guiding the movement of each component for exchange as described above may be included. For example, in order to guide the correct linear motion of the coupler 26, a pair of horizontal guides 28 may be installed in the mold so as to contact the left and right sides of the coupler 26. In addition, a pair of vertical guides 32 may be installed inside the mold on both left and right sides to accurately guide the vertical movement of the core 10.

In addition, in order to disassemble the core 10, in order to determine the exact stop position of the coupler 26 linearly moving outward by the rotation of the adjusting screw 20, the stopper 24 supported by the mold from the outside of the coupler 26 It is also preferable to install. Therefore, when the adjusting screw 20 is rotated for the exchange of the core 10, when the coupler 26 horizontally moving outward contacts the stopper 24, the rotation of the adjusting screw 20 is stopped, which is convenient to use. Is expected. If the stopper 24 is in contact with the coupler 26 to prevent further outward movement, various modifications may be made to its shape and design position. And in the illustrated embodiment, the coupler 26 is designed to be supported by the mold M in a state in which the adjusting screw 20 penetrates.

Within the scope of the technical idea of the present invention as described above, it can be said that various modifications will be possible to those skilled in the art. And it is obvious that the protection scope of the present invention should be interpreted based on the matters described in the claims.

10 ..... Core
10a ..... core joint hole
10K ..... core
20 .... Adjustment screw
22 ..... Screw connection block
24 ..... Stopper
26 ..... Coupler
26a ..... combined projections
28 ..... Horizontal guide
32 ..... Vertical guide
M ..... mold
Ma ..... Combiner of mold

Claims (4)

For forming a part of a cavity molded by a plurality of molds, the shape of a part of the cavity can be changed by exchange, and for exchange of the core 10 moving up and down in the cavity direction from the mating hole Ma of the mold;
A coupler (26) having a coupling protrusion (26a) which is supported to be movable in a horizontal direction in the inside of the mold and which can be coupled to a coupling hole (10a) of the core;
It comprises a horizontal moving means for moving the coupler 26 in the horizontal direction;
The engaging projection (26a) and the engaging hole (10a) is molded to have a high outer side and a lower inner side slope;
When the coupling protrusion 26a of the coupler 26 is disengaged from the coupling hole 10a of the core 10 by the horizontal moving means, the core 10 is separated from the coupling hole Ma of the mold to join another core Can be mounted on;
When the coupler 26 moves inward, by the inclined direction of the engaging projection 26a and the engaging hole 10a, the core 10 rises and engages the coupler 26;
When the coupler 26 moves outward, the core of the mold characterized in that the core 10 can be separated from the coupler 26 while descending by the inclined direction of the coupling protrusion 26a and the coupling hole 10a. Exchange device.
The method of claim 1, wherein the horizontal moving means, the screw coupling block (22) supported by the mold, the outer surface is threaded so as to be screwed with the screw coupling block and the inner end is connected to the coupling screw (26) Core exchange device of the mold consisting of (20).
The stopper (24) according to claim 1 or 2, wherein the coupler is horizontally moved outward such that the coupling protrusion (26a) of the coupler is separated from the coupling hole (10a) of the core, thereby preventing further movement by contacting the coupler. ) Further comprising a core exchange device of the mold.
[4] The core exchange apparatus of claim 3, further comprising a vertical guide and a horizontal guide to guide vertical movement of the core and horizontal movement of the coupler, respectively.

Images