KR20190136471A - Molding method and mold for improving bonding properties of metal and plastic composites - Google Patents

Abstract

The present invention relates to a mold which comprises: a first core including a first recessed portion formed by recessing a portion of one surface; and a second core including a protrusion portion in which a portion of a lower surface protrudes and a second recessed portion in which a portion of the lower surface is recessed in the direction facing the first core, and opening and closing the first recessed portion by being close to the first core.

Description

Molding method and mold for improving bonding properties of metal and plastic composites}

The present invention relates to a molding method and a mold of the composite, and more particularly, to a molding method for improving the bonding property between dissimilar metals of the composite consisting of metal and plastic, and a mold used in the molding method.

Recently, the demand for composites is increasing for various reasons, such as functional aspects of composites composed of metals and plastics and aesthetics of materials.

Among the techniques for integrating metal and plastic to form a metal-plastic composite, a method of simultaneously injecting and heating two heated materials is used.

However, the adhesive used in the bonding between the metal and the plastic may cause a problem of peeling when the bonding is insufficient.

In other words, the bonding performance between the dissimilar materials of the metal and plastic is very poor, and there is a possibility of generating toxic substances such as odor / VOC due to the adhesive application.

The present invention proposes a more reliable method of improving adhesion than the conventional case through structural changes between dissimilar materials, particularly metals and plastics.

Republic of Korea Patent Publication No. 10-2018-0007216

The present invention has been made to solve the above-mentioned problems of the prior art, to provide a molding method that can improve the bonding between metal and plastic.

In addition, to provide a mold used in the molding method.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

The mold of the present invention for achieving the above object is a first core including a first recessed portion is formed by recessing a portion of one side and a projection portion of which a portion of the lower surface and a portion of the lower surface facing the first core And a second core recessed in a direction, and including a second core to open and close the first recessed portion by the protrusion as the first core approaches the first core.

In this case, the second recessed portion may be characterized in that at least a portion of the portion in which the protrusion is formed from the lower surface is recessed in a direction facing the first core.

In order to achieve the above object, the composite molding method of the present invention includes a protrusion in which a portion of a lower surface protrudes and a portion of the lower surface of the first core includes a first recessed portion formed by recessing a portion of one surface thereof. Lowering the second core including a second recessed portion recessed in an opposite direction so that the protrusion is positioned in the first recessed portion and the first recessed portion is closed, and injecting plastic into at least a portion of the first recessed portion; The step of raising the second core to open the first recessed portion, the third core having a flat surface when the protruding portion formed in a part of the plastic by the second recessed portion protrudes in the transverse direction It may include the step of descending to one core and injecting a metal into a recessed space formed in a portion of the plastic by the protrusion.

In this case, injecting the plastic into at least a portion of the first recessed portion may be a step of injecting the plastic into the first recessed portion so that the plastic is filled in the first recessed portion and the second recessed portion.

The lowering of the third core to the first core may include lowering the third core to the first core when the temperature of the plastic provided in the first core is lower than or equal to a glass transition temperature.

In order to achieve the above object, the composite molding method of the present invention includes a protrusion in which a portion of a lower surface protrudes and a portion of the lower surface of the first core includes a first recessed portion formed by recessing a portion of one surface thereof. Lowering the second core including a second depression recessed in an opposite direction so that the protruding portion is positioned in the first depression and the first depression is closed, and injecting metal into at least a portion of the first depression; The step of raising the second core to open the first recessed portion, the third core flattened if the protruding portion formed in a part of the metal by the second recessed portion protrudes in the transverse direction It may include the step of descending to one core and injecting plastic into a recessed space formed in a portion of the metal by the protrusion.

In this case, the step of injecting a metal into at least a portion of the first recessed portion may be a step of die casting the metal to the first recessed portion so that the metal is filled in the first recessed portion and the second recessed portion.

Alternatively, the injecting the plastic may include injecting the plastic into a recessed space formed in a portion of the metal by the protrusion after cooling the metal to 180 degrees or less.

Mold and composite molding method of the present invention for solving the above problems has the following effects.

First, the bonding can be maintained through structural changes between the metal and the plastic, so the reliability of the bonding is high.

Second, the existing injection process can be used as it is, economical, and no additional process is fast.

Third, there is no chemical problem because no binder is used for the bonding between metal and plastic.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a view of a mold of the present invention.
2 to 8 are flowcharts of the composite molding method of the present invention.
9 is a view showing a composite produced by the composite molding method using a mold of the present invention.
10 to 12 are flowcharts of the composite molding method of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of this embodiment, the same name and the same reference numerals are used for the same configuration and additional description thereof will be omitted.

In addition, in describing the embodiments of the present invention, the same name and the same reference numerals are used for the elements having the same function, and it is revealed that they are not substantially the same as in the related art.

In addition, the terms used in the embodiments of the present invention are merely used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In addition, in the embodiments of the present invention, the terms "comprise" or "have" are intended to designate that there exists a feature, number, step, operation, component, part, or a combination thereof described in the specification. Or other features or numbers, steps, operations, components, parts or combinations thereof in any way should not be excluded in advance.

The mold of this invention is demonstrated with reference to FIG. 1 is a view of a mold of the present invention.

The mold of the present invention includes a first core 100 including a first recessed portion 120 formed by recessing a portion of one surface thereof, a protrusion 220 through which a portion of the lower surface protrudes, and a portion of the lower surface of the mold. And a second depression 240 that is recessed in a direction opposite to 100, and opens and closes the first depression 120 by the protrusion 220 as the first core 100 approaches the first core 100. It may include a second core 200.

The first core 100 may be formed with a first recessed part 120 in which a portion of one surface is recessed. The first recessed part 120 is a space that can be closed or opened by the first core 100 and the second core 200.

That is, as the second core 100 approaches the first recessed portion 120 of the first core 100, the first core 100 and the first core 120 are closed. The second core 200 may be located.

The plastic 400 has the first recess 120 and the second recess when the first core 100 and the second core 200 contact each other to close the first recess 120. The part 240 may be injected to be filled with the plastic 400.

Accordingly, the first recess 120 may be formed deeper than the length of the protrusion 220 and wider than the width of the protrusion 220.

The first recess 120 may be recessed by the shape and volume to be represented by the plastic 400 in the metal-plastic composite, and the cross section is not necessarily limited to the quadrangle as shown in the drawing.

The second core 200 may include a protrusion 220 and a second recess 240, and the protrusion 220 may be configured to protrude a portion of the bottom surface of the second core 200.

In addition, the second recess 240 may have a configuration in which a part of the lower surface of the second core 200 is recessed in a direction facing the first core 100.

The protrusion 220 may be close to the bottom surface of the first recess 120 as the first core 100 approaches the second core 200.

That is, the protrusion 220 may be provided such that the first recess 120 is opened and closed by the protrusion 220 as the first core 100 and the second core 200 are close to each other.

The protrusion 220 may also be formed in various ways, without being limited to a quadrangle like the first recessed part 120.

In addition, a portion of the plastic 400 may be recessed by the protrusion 220, and the metal 500 may be injected into the recessed portion of the plastic 400.

The second recessed part 240 is a space in which a part of the second core 200 is recessed and may be formed on a part of the surface on which the protrusion part 220 is formed.

That is, the second recess 240 may be formed such that at least a part of the portion where the protrusion 220 is formed from the bottom surface of the second core 200 is recessed in a direction facing the first core 100. have.

The second recess 240 may be formed to recess at least a portion of the bottom surface of the second core 200 along the circumference of the protrusion 220.

At this time, as described above, the plastic 400 filled in the first recess 120 may be injected into the first recess 120 to be filled up to the second recess 240.

With reference to Figures 2 to 7 will be described in the composite molding method of the present invention. 2 to 7 is a flow chart for a composite molding method using the above-described mold of the present invention.

The same configuration as the above-described mold of the composite molding method of the present invention can implement the same or similar objects and effects, and description of the same configuration as the mold in the following composite molding method will be omitted.

In the composite molding method of the present invention, the step of lowering the second core 200 to the first core 100 (S100), the step of injecting plastic 400 (S200), and raising the second core 200. (S300), the step of lowering the third core 300 to the first core 100 (S400) and injecting the metal 500 (S500) may be included.

As shown in FIG. 3, the step of lowering the second core 200 to the first core 100 is a lower surface of the first core 100 including the first recessed portion 120 formed by recessing a portion of one surface thereof. The projection 220 includes a second core 200 including a protrusion 220 protruding from a portion of the lower surface and a second depression 240 in which a portion of the lower surface is recessed in a direction facing the first core 100. ) Is located at the first recessed part 120 and preferably descending to close the first recessed part 120.

The molten plastic 400 is formed through the step of the second core 200 having the protrusions 220 and the second recesses 240 descending to the first core 100. And the second recess 240 may be filled.

As shown in FIG. 4, the injecting the plastic 400 may be injecting the plastic 400 into at least a portion of the space formed by the first core 100 and the second core 200.

The space formed by the first core 100 and the second core 200 is specifically a closed space by the first recessed part 110, the protrusion 220, and the second recessed part 240. Can be.

The plastic 400 may be injected, that is, injected into the first recess 120 in a molten state.

In this case, injecting the plastic 400 into at least a portion of the first recessed portion 120 so that the plastic 400 is filled in the first recessed portion 120 and the second recessed portion 240. The plastic 400 may be injected into the first recessed part 120.

That is, the plastic 400 is injected into the first recess 120 so that the molten plastic 400 is filled in the first recess 120 and the second recess 240 without empty space. Do.

As can be seen in FIG. 5, the raising of the second core 200 may be the raising of the second core 200 to open the first recess 120.

At this time, the step of raising the second core 200 is preferably raised when the temperature of the plastic 400 is below the glass transition temperature. This is to maintain the shape of the plastic 400.

Therefore, when the second core 200 is lifted from the first core 100 and the first recess 120 is opened, the plastic 400 injected into the first core 100 is the second core. A space in which a portion is recessed by the protrusion 220 of the 200 may be formed, and a space in which a portion may be protruded by the second recess 240 of the second core 200 may be formed.

As can be seen in Figure 6, the step of lowering the third core 300 to the first core 100, the protruding portion formed in a portion of the plastic 400 by the second recess 240 is transverse The lower surface to protrude in a direction may be a step of lowering the flat third core 300 to the first core (100).

In this case, the step of lowering the third core 300 to the first core 100 may be performed when the temperature of the plastic 400 provided in the first core 100 is less than or equal to a glass transition temperature. It may be a step to descend 300 to the first core (100).

Since the lower portion of the third core 300 is formed to be flat on the first core 100, the third core 300 comes into contact with the first core 100 as shown in FIG. 7. The direction of the protruding portion formed in the plastic 400 may be changed by the second recess 240.

That is, the portion protruding from the plastic 400 before the third core 300 descends to the first core 100 may be formed in the longitudinal direction. However, after the third core 300 descends to the first core 100, the direction in which the protruding portion of the plastic 400 protruding in the longitudinal direction protrudes in the transverse direction may be changed.

Specifically, as described above, when the plastic 400 is below the glass transition temperature to maintain its shape, the second core 200 may rise from the first core 100.

In addition, before the plastic 400 is completely solidified, the third core 300 may descend to the first core 100 to change the protruding portion of the plastic 400 in the transverse direction.

At this time, the first core 100 in which the second core 200 is raised for the convenience of the process is transferred to the lower end of the third core 300 so that the third core 300 is lowered to the first core 100. Can be.

As shown in FIG. 8, injecting the metal 500 into the plastic 400 may inject the metal 500 into a recessed space formed in a part of the plastic 400 by the protrusion 220, that is, die casting. It may be a step.

Specifically, the method may be a step of placing the metal 500 in the recessed space formed in a part of the plastic 400 by the protrusion 220 to be filled in the recessed space formed in the plastic 400. .

As described above, after the plastic 400 is injected while the first core 100 and the second core 200 are in contact with each other, the second core 200 is far from the first core 100. A recessed space is formed in a part of the plastic 400.

At this time, the metal 500 may be injected into the recessed space of the plastic 400. The metal 500 may be a low melting point alloy.

Specifically, the metal 500 may be injected into the recessed space of the plastic 400 in a molten state.

The metal 500 may be injected to fill all of the metal 500 in the space formed by the third core 300 and the plastic 400.

Therefore, when the third core 300 is far from the first core 100, a metal-plastic composite may be formed as shown in FIG. 9.

The metal-plastic composite may be provided such that a portion of the plastic 400 including a portion of the metal 500 protrudes toward the metal 500 with respect to the metal 500.

The protrusion of the plastic 400 protruding in the lateral direction may serve to support the metal 500 not to be separated from the plastic 400.

Therefore, the metal 500 may be stably located in the plastic 400 by the protruding portion of the plastic 400.

A second embodiment of the composite molding method of the present invention will be described with reference to FIGS. 10 to 12. 10 to 12 is a flow chart for a composite molding method of a high melting point alloy and a plastic using the above-described mold of the present invention.

The same configuration as the above-described mold of the composite molding method of the present invention can implement the same or similar objects and effects, and description of the same configuration as the mold in the following composite molding method will be omitted.

In particular, the second embodiment of the composite molding method of the present invention to be described below is only a difference between the composite molding method of the present invention and the timing of injecting plastic and metal.

That is, as can be seen in Figure 10, the second embodiment of the composite molding method of the present invention is the step of lowering the second core 200 to the first core 100 (S100), injecting a metal 500 (S600), raising the second core 200 (S300), lowering the third core 300 to the first core 100 (S400) and injecting the plastic 400 (S700) It may include.

At this time, the step of lowering the second core 200 to the first core 100 (S100), the step of raising the second core 200 (S300) and the third core 300 to the first core (100) Lowering step (S400) may be a configuration for implementing the same purpose and effect as the above-described composite molding method of the present invention.

Injecting the metal 500 that passes after the step of lowering the second core 200 to the first core 100 (S100) may include the first recess 120 and the metal 500. Die casting the metal 500 to the first recess 120 to be filled in the second recess 240.

That is, the metal 500 may be die cast in a molten state in the closed space by the first recess 120, the protrusion 220, and the second recess 240.

In this case, the metal 500 may be formed of aluminum.

Injecting the plastic 400 after the step (S400) of lowering the third core 300 to the first core 100 (S700) cools the metal 500 to 180 degrees or less, and then the protrusions. It may be a step of injecting the plastic 400 in the recessed space formed in a portion of the metal 500 by 220.

The metal-plastic composite produced by the second embodiment of the composite molding method of the present invention may include a portion of the metal 500 including the plastic 400 with respect to the plastic 400, as shown in FIGS. 11 and 12. Some may be provided to include protrusions protruding in the plastic 400 direction.

The protrusion of the metal 500 protruding in the lateral direction may serve to support the plastic 400 not to be separated from the metal 500.

Therefore, the plastic 400 may be stably located in the metal 500 by the protruding portion of the metal 500.

As described above, a preferred embodiment according to the present invention has been described, and the fact that the present invention can be embodied in other specific forms in addition to the above-described embodiments without departing from the spirit or scope thereof has ordinary skill in the art. It is obvious to them. Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and thus, the present invention is not limited to the above description and may be modified within the scope of the appended claims and their equivalents.

100: first core
120: first depression
200: second core
220: protrusion
240: second depression
300: third core
400: plastic
500: metal

Claims (8)

A first core including a first recessed portion formed by recessing a portion of one surface thereof; And
And a second recessed portion in which a portion of the lower surface protrudes and a portion of the lower surface recessed in a direction facing the first core, and opening and closing the first recessed portion by the protrusion as the first core approaches the first core. Second core;
Mold comprising a. The method of claim 1,
And the second recessed portion is recessed in at least a portion of the portion where the protrusion is formed from the lower surface in a direction facing the first core. A second core including a protrusion protruding a portion of the lower surface and a second recessed portion in which the portion of the lower surface is recessed in a direction facing the first core; Lowering the core such that the protrusion is located at the first recess and the first recess is closed;
Injecting plastic into at least a portion of the first depression;
Raising the second core to open the first recess;
Lowering the third core having a flat bottom surface to the first core such that the protruding portion formed in a part of the plastic by the second recessed portion protrudes in the horizontal direction; And
Injecting metal into a recessed space formed in a portion of the plastic by the protrusion;
Composite molding method comprising a. The method of claim 3, wherein
Injecting plastic into at least a portion of the first recessed portion is injecting the plastic into the first recessed portion so that the plastic is filled in the first recessed portion and the second recessed portion. The method of claim 3, wherein
The step of lowering the third core to the first core is a step of lowering the third core to the first core when the temperature of the plastic provided in the first core is below the glass transition temperature. A second core including a protrusion protruding a portion of the lower surface and a second recessed portion in which the portion of the lower surface is recessed in a direction facing the first core; Lowering the core such that the protrusion is located at the first recess and the first recess is closed;
Injecting metal into at least a portion of the first depression;
Raising the second core to open the first recess;
Lowering the third core having a flat bottom surface to the first core such that the protruding portion formed in a part of the metal by the second recessed portion protrudes in the horizontal direction; And
Injecting plastic into a recessed space formed in a portion of the metal by the protrusion;
Composite molding method comprising a. The method of claim 6,
Injecting metal into at least a portion of the first recessed portion is die casting the metal into the first recessed portion such that the metal is filled with the first recessed portion and the second recessed portion. The method of claim 6,
The injecting the plastic is a step of injecting the plastic into the recessed space formed in the portion of the metal by the protrusion after cooling the metal to 180 degrees or less.

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