KR101307150B1 - Metal Member Having Honeycomb-Shaped Inner Structure, Inner Structure Molding Frame, Injection Molding Method of Metal Member Using the Same and Metal Member Manufactured by the Same - Google Patents

Abstract

The metal member injection molding apparatus having the honeycomb-shaped internal structure of the present invention includes a plurality of shape parts disposed side by side at a predetermined interval apart from each other to form a honeycomb as a whole, and an adjacent shape part among the plurality of shape parts. An inner structure forming frame formed of a meltable material, an upper core having an upper plate forming portion corresponding to an upper plate shape of a metal member to be formed, and a lower plate shape of the metal member to be formed. And a lower core having a lower plate forming part corresponding to the upper core or at least one side of the lower core, and a fixing part for fixing the internal mold forming frame is formed between the upper plate forming part and the lower plate forming part.
In addition, in the metal member injection molding method using the same, a fixing step of fixing the internal forming mold between the upper core and the lower core, injection of metal powder is injected into a molding space formed between the upper core and the lower core. An injection step, a demolding step of demolding the injection molded body by the injection step from the upper core and the lower core, a degreasing step of removing the internal structure forming frame by performing a degreasing process on the injection body, and the degreasing step And a sintering step of heating the coarse injection body to sinter the metal powder.

Description

Metal member injection molding apparatus having an internal structure of honeycomb shape, internal structure molding frame used therein, and metal member injection molding method using the same, and metal member manufactured by the same {Metal Member Having Honeycomb-Shaped Inner Structure, Inner Structure Molding Frame, Injection Molding Method of Metal Member Using the Same and Metal Member Manufactured by the Same}

The present invention relates to a metal member injection molding apparatus for molding a fine metal member and a metal member injection molding method using the same, and more particularly, to a metal member including an internal structure forming frame for forming a honeycomb-shaped internal structure. An injection molding apparatus and a metal member injection molding method using the same.

In general, metal powder injection molding called MIM (Metal Injection Molding) or PIM (Powder Injection Molding) is widely used as a method of mixing metal powder into a conventional injection molding method and producing metal products .

However, such metal powder injection molding is currently in the development stage of the technology, and is not applied to the manufacture of large-sized products, and is often used for manufacturing small-sized products.

Particularly, as one of the products manufactured by the metal powder injection molding, a metal member having an internal structure for securing an improved strength is widely used. This is generally manufactured in the form of a metal plate of a minute size. Specifically, the upper plate and the lower plate are coupled to each other, and an inner structure for securing strength is formed between the upper plate and the lower plate.

At this time, a honeycomb form is generally used as an internal structure for securing sufficient strength and stability. However, since the honeycomb-like internal structure is complicated in shape, there is a problem in that it is difficult to form a metal member.

Meanwhile, FIG. 1 shows a process for manufacturing the metal member. 1, the metal member 1 includes an upper plate 10 and a lower plate 30, and a reinforcing plate 22 having a plurality of honeycomb hollows 22 formed between the upper plate 10 and the lower plate 30, (20). That is, the metal member 1 has a three-layer structure including an upper plate 10, a reinforcing plate 20, and a lower plate 30.

Therefore, in the conventional case, in order to manufacture the metal member 1, the process of forming the upper plate 10 and the lower plate 30 respectively and further forming the reinforcing plate 20 into a separate mold and attaching them separately You need to do it.

However, since the upper plate 10, the reinforcing plate 20, and the lower plate 30 are separately manufactured and attached to each other as described above, the conventional metal member 1 manufactured by the above- And there is a risk of breakage if adhesion is weakened over time. As a result, there arises a problem that it is difficult to achieve the original purpose of ensuring sufficient strength.

In addition, since the upper plate 10, the lower plate 30, and the reinforcing plate 20 are separately formed in the present method, the manufacturing process is complicated and the manufacturing cost is greatly increased. Particularly, although the upper plate 10 and the lower plate 30 can be manufactured from the same mold, a separate mold is required in the case of the reinforcing plate 20, thereby wasting space.

Therefore, a method for solving such problems is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal member injection molding apparatus and a metal member injection molding method using the metal member injection molding apparatus for solving the problem that the molded metal member is likely to be broken by an external force or time .

It is another object of the present invention to provide a metal member injection molding apparatus and a metal member injection molding method using the metal member injection molding apparatus.

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

Metal member injection molding apparatus having an internal structure of the honeycomb shape of the present invention for solving the above process is disposed side by side spaced apart from each other at a predetermined interval to form a plurality of the shape of the honeycomb as a whole, the plurality of A connection part connecting the adjacent ones of the shape parts to each other, the inner structure forming frame formed of a meltable material, an upper core having an upper plate forming part corresponding to the upper plate shape of the metal member to be formed, and corresponding to the upper core, And a lower core having a lower plate forming part corresponding to a lower plate shape of the metal member to be formed, and at least one side of the upper core or the lower core includes the internal structure forming frame between the upper plate forming part and the lower plate forming part. A fixing portion for fixing is formed.

In addition, the width of the inner mold forming frame is formed longer than the width of the upper plate forming portion and the lower plate forming portion, the fixing portion is formed to correspond to the width of the inner structure forming frame, the upper plate forming part or the lower plate forming part It may be formed stepped from at least one side of the.

The shape portion may be formed in a hexagonal shape, and the connection portion may extend from at least one surface of each surface of the shape portion.

In addition, the width of the connection portion may be formed shorter than the length of each side of the shape portion.

In addition, the internal forming mold used therein includes a plurality of shape parts arranged side by side at a predetermined interval apart from each other to form a honeycomb shape as a whole, and a connection part connecting the adjacent shape parts of the plurality of shape parts to each other. It is formed of a meltable material.

In addition, the shape portion is formed in a hexagonal shape, the connection portion may be formed extending from at least one surface of each surface of the shape portion.

And, the width of the connection portion may be formed shorter than the length of each surface of the shape portion.

In addition, the metal member injection molding method using the same, and arranged side by side at a predetermined interval spaced apart from each other to form a honeycomb shape as a whole and a connecting portion for connecting between the adjacent shape of the plurality of the shape portion to each other; And an upper core having an internal structure forming frame formed of a meltable material, an upper core forming part corresponding to the upper plate shape of the metal member to be formed, and a lower plate forming part corresponding to the upper core and corresponding to the lower plate shape of the metal member to be formed. The lower part includes a lower core, and at least one side of the upper core or the lower core, using a metal member injection molding apparatus is formed between the upper plate forming portion and the lower plate forming portion fixing portion for fixing the internal forming mold In the metal member injection molding method, the upper core and the lower core yarn A fixing step of fixing the inner mold to the mold, an injection step of injecting metal powder into a molding space formed between the upper core and the lower core, and an injection molded body produced by the injection step of the upper core and the A demolding step of demolding from a lower core, a degreasing step of removing the internal structure mold by performing a degreasing process on the injection molded body, and a sintering step of sintering metal powder by heating the injection molded body after the degreasing step.

Metal member injection molding apparatus having a honeycomb-shaped internal structure of the present invention for solving the above problems and a metal member injection molding method using the same has the following effects.

First, since each of the metal members is integrally formed, the strength of the overall structure is greatly increased.

Second, since the metal member can be manufactured only by one molding process, the manufacturing cost and manufacturing time can be greatly shortened.

Third, there is an advantage that a separate mold for forming the internal structure is not necessary.

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

1 is a perspective view showing a metal member manufactured according to a conventional metal member forming method;
2 is a cross-sectional view showing a state in which an internal structural mold is provided between the upper core and the lower core in the metal member injection molding apparatus according to an embodiment of the present invention;
3 is a cross-sectional view showing a state in which the internal mold is fixed between the upper core and the lower core in the metal member injection molding apparatus according to an embodiment of the present invention;
Figure 4 is a plan view showing in detail the detailed structure of the internal molding frame in the metal member injection molding apparatus according to an embodiment of the present invention; And
Figure 5 is a perspective view showing the overall appearance of a metal member manufactured by a metal member injection molding apparatus and a metal member injection molding method according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

As described in the background section, conventionally, in order to manufacture a metal member by metal powder injection molding, the upper plate, the lower plate, and the reinforcing plate are separately formed and attached to each other. Therefore, it is difficult to ensure sufficient strength, the manufacturing process is complicated, and the manufacturing cost is increased.

However, in the case of the present invention, there is an advantage in that it is possible to manufacture a high-strength metal member having a complicated internal structure for improving the strength between the upper plate and the lower plate by only one molding. This will be described in detail below.

First, referring to FIG. 2, a metal member injection molding apparatus for forming a metal member according to an embodiment of the present invention is illustrated. The metal member injection molding apparatus includes an upper core 110 as a whole, a lower core 120, and an inner structure forming mold 200 positioned between the upper core 110 and the lower core 120 .

The upper core 110 and the lower core 120 have a top plate forming portion and a lower plate forming portion, respectively, and a molding space is formed in the inside according to the mutual engagement. At this time, the upper core 110 and the lower core 120 may be provided in a separate mold, or may be formed as a mold itself. The term " core " Do not.

In addition, the upper core 110 and the lower core 120 includes a form in which each core is positioned in an up and down direction as well as in a direction other than an up and down direction, and is not limited by the upper and lower names. .

Hereinafter, each component will be described in more detail.

First, the upper core 110 is opposed to the lower core 120 and has an upper plate forming portion 112 corresponding to the upper plate shape of the metal member to be formed.

Similarly, the lower core 120 is opposed to the upper core 110 and has a lower plate forming portion 122 corresponding to the lower plate shape of the metal member to be formed.

And, at least one side of the upper core 110 or the lower core 120, a fixing portion for fixing the internal forming mold 200 between the upper plate forming portion 112 and the lower plate forming portion 122 is formed. That is, the fixing part may be formed on only one side of the upper core 110 or the lower core 120, or may be formed on both sides.

In addition, the fixing method of the fixing part may be variously formed. In any form, it suffices that the inner structure forming mold 200 can be fixed between the upper mold forming portion 112 and the lower mold forming portion 122.

Referring to FIG. 2, in the present embodiment, the width of the internal forming mold 200 is longer than the width of the upper plate forming part 112 and the lower plate forming part 122, and the fixing parts 114 and 124 are formed on the upper plate. It is formed stepped from the portion 112 and the lower plate forming portion 122.

Accordingly, since the fixing part corresponds to the width of the internal forming mold 200, when the upper core 110 and the lower core 120 are engaged with each other, as shown in FIG. 3, the upper plate forming part 112 and the lower plate forming part ( Internal structure forming frame 200 may be fixed between the 122.

However, the upper core 110 and the lower core 120 may be fixedly formed on one side of the upper core 110 and the lower core 120, to be.

On the other hand, in the present embodiment, the injection path for injecting the metal powder in the molding space is formed in the upper core 110, which is obvious to those skilled in the art will be omitted detailed description.

The upper plate portion of the metal member to be manufactured later is formed by the upper plate forming portion 112 of the upper core 110 and the lower plate forming portion 122 of the lower core 120 forms the lower plate of the metal member, The part is molded. And, by the internal structure forming frame 200 fixed to the fixing portion, it is possible to mold the internal structure for improving the strength of the metal member.

At this time, the internal structure, but may have a variety of forms, it is generally known that in the case of a honeycomb (Honeycomb) form may have an ideal strength. However, as described above, since the internal structure of the honeycomb type is complicated in shape, there is a problem in that it is difficult to form a metal member.

4, a detailed view of the detailed structure of the internal structure forming mold 200 according to an embodiment of the present invention is shown. As shown in the figure, the inner structure forming molds 200 include a plurality of shape portions 210 arranged in a state of being spaced apart from each other by a predetermined distance to form a honeycomb shape as a whole, And a connection part 230 connecting the liver to each other.

More specifically, the shape portions 210 are formed in a hexagonal shape, and are uniformly arranged over the entire area of the internal structure forming mold 200. In addition, the connection portion 230 is formed to extend from at least one surface of each surface of the shape portion 210 such that the shape portion 210 can achieve a fixed state with each other. As a result, the plurality of shape portions 210 can be integrally fixed as a whole by the connecting portion 230.

At this time, the width of the connection portion 230 can be confirmed that the shorter than the length of each surface of the shape portion 210, and thus it is possible to ensure the hollow portion 220 of sufficient space between each shape portion 210. The reason for doing this is that the hollow portion 220 is for forming the internal structure of the metal member to be manufactured later, and it is necessary to secure a sufficient space.

As such, the size and number of the connection portion 230 can be variously modified, there is an advantage that can be selected according to the situation appropriately used.

In addition, the internal forming mold 200 is formed of a material that can be melted at a high temperature, which is for ease of demoulding, and may be formed of a material that can be melted at a high temperature such as various polymer composite materials. More details are given later.

As described above, the metal member injection molding apparatus according to the present invention has been described. Hereinafter, a series of processes for manufacturing the metal member using the same will be described.

In the metal member injection molding method of the present invention, first, a fixing step of fixing the internal forming mold 200 between the upper core 110 and the lower core 120 is performed. In this step, the upper core 110 and the lower core 120 are engaged with each other to form a molding space therein, and the inner structure forming mold 200 is fixed by the fixing portion.

Next, an injection step of injecting and injecting metal powder into the molding space formed between the upper core and the lower core is performed. In this step, the metal powder is injected into the molding space through the injection path and then injected, and accordingly, the upper part forming part 112, the lower part forming part 122, and the hollow part 220 of the internal structure forming mold 200. ) Is filled with metal powder. That is, since the molding space is generally communicated by the hollow portion 220 of the internal forming mold 200 without an isolated space, it is possible to fill the entire molding space by injecting only one side of the metal powder.

Through this step, the metal powder is in the form of a product, in which the internal structure forming mold 200 is still provided therein. A mixture of the metal powder thus injected and the internal structure forming mold 200 is referred to as an injection body or a green part, hereinafter referred to as an injection body.

Next, a demolding step for demolding the injection molded body produced by the injection step from the upper core and the lower core is performed. In this step, the injection molded body is separated from each core, but the injection molded body has a basic shape, but it is necessary to remove the internal forming mold 200.

Thereafter, a degreasing step of removing the internal mold is performed by performing a degreasing process on the injection molded body. In this step, the injection molded product is put into a degreasing furnace, and a degreasing process is performed. In this case, as the degreasing process, a method of melting the internal structure mold 200 by a chemical solvent may be used, or a method of heating and melting above a melting point of a material forming the internal structure mold 200 may be used. It goes without saying that the above two methods may be used in combination.

Through this step, the internal structure mold 200 is completely melted and discharged to the outside of the injection molding. Specifically, since the metal powder is filled in the hollow portion 220 of the inner mold 200, the shape portion 210 and the connection portion 230 is discharged between the metal powder filled in the hollow portion 220 during melting. .

This is possible because the connection part 230 is formed in the internal structure forming mold 200 and can be discharged outward along the connection part 230 even when the inside part 210 is melted. At this time, when the area of the connecting portion 230 is large, or when the number is large, it is easy to discharge, but may affect the strength of the metal member, it is preferable to balance the balance.

On the other hand, the injection molded body 200 removed the internal structure is also called Brown (Brown Part).

Next, a sintering step of sintering the metal powder by heating the injection body through the degreasing step is performed. In this step, the injection molded body from which the internal structure mold 200 is removed is put into a sintering furnace, and heated to a temperature of about 1000 ° C. At this time, the heating temperature may vary depending on the melting point of the metal powder used. When the injection body is heated as described above, the metal powder is melted to be combined with the other metal powder in the periphery, and a metal member is produced.

Meanwhile, after the sintering step, a cooling process of the manufactured metal member may be additionally performed.

5 shows a state of the metal member 300 manufactured by each process. As shown in the figure, a honeycomb-shaped hollow 322 is formed between the upper plate 310 and the lower plate 330 by a partition 320.

In particular, in the case of the present invention, since the internal structure mold 200 is melted and removed in the sintering step, the upper plate, the lower plate, and the partition wall 320 may be integrally formed. That is, compared with the conventional case of separately manufacturing each component and attaching to each other, a significantly improved strength can be obtained, and since the metal member can be manufactured by only one operation, there is an advantage that a stable yield can be obtained.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. 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.

110: upper mold
112: upper plate forming part
120: lower mold
122: lower plate forming part
114, 124: fixed part
200: internal structure forming mold
210: shape
220: connection
230: hollow part
300: metal member

Claims (9)

An internal structure forming frame formed of a meltable material, comprising a plurality of shape parts disposed side by side at a predetermined interval apart from each other to form a honeycomb shape as a whole, and a connection part connecting the adjacent shape parts among the plurality of shape parts to each other; ;
An upper core having an upper plate forming portion corresponding to an upper plate shape of a metal member to be formed; And
A lower core corresponding to the upper core and having a lower plate forming portion corresponding to a lower plate shape of a metal member to be formed;
Including;
Wherein at least one of the upper core and the lower core is provided with a fixing part for fixing the inner structure molding die between the upper plate molding part and the lower plate molding part,
Wherein a width of the internal structure forming mold is formed to be longer than a width of the upper plate forming portion and the lower plate forming portion,
Wherein the fixing portion is formed to correspond to the width of the inner structure forming mold and is formed to be stepped from at least one of the upper mold forming portion and the lower mold forming portion. delete The method of claim 1,
Wherein the shape is formed in a hexagonal shape and the connecting portion extends from at least one of the surfaces of the shape. The method of claim 3,
And the width of the connecting portion is shorter than the length of each side of the shape portion. delete delete delete An internal structure forming frame formed of a meltable material, including a plurality of shape parts disposed side by side and spaced apart from each other at a predetermined interval, and connecting portions connecting the adjacent shape parts among the plurality of shape parts with each other; And an upper core having an upper plate forming portion corresponding to the upper plate shape of the metal member to be formed, and a lower core corresponding to the upper core and having a lower plate forming portion corresponding to the lower plate shape of the metal member to be formed, wherein the upper core or At least one side of the lower core, a fixing portion for fixing the internal mold forming frame is formed between the upper plate forming part and the lower plate forming part, the width of the internal structure forming frame is the upper plate forming part and the lower plate forming part It is formed longer than the width, the fixing portion corresponding to the width of the internal mold forming frame Is formed, in the metallic member injection molding method using a metal member injection-molded device formed stepped from at least one side of the upper plate forming part or the lower plate forming portion,
Fixing the inner structure forming mold between the upper core and the lower core;
Injecting metal powder into a molding space formed between the upper core and the lower core and injecting the metal powder;
A demolding step of demolding the injection body manufactured by the injection step from the upper core and the lower core;
A degreasing step of removing the internal structure forming mold by performing a degreasing process on the injection body; And
A sintering step of sintering the metal powder by heating the injection body through the degreasing step;
Metal member injection molding method comprising a. Metal member manufactured by the method of claim 8.

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