KR101402803B1 - Metal Member Having 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

A metal member injection molding apparatus having an internal structure according to the present invention includes a plurality of shape portions formed in a predetermined shape in a state of being spaced apart from each other by a predetermined distance and a connecting portion connecting adjacent ones of the plurality of shape portions 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 plate corresponding to the lower plate of the metal member to be formed, And at least one of the upper core and the lower core has a fixing part for fixing the inner structure forming mold between the upper plate forming part and the lower plate forming part.
The metal member injection molding method using the method includes a fixing step of fixing the internal structure forming mold between the upper core and the lower core, a step of injecting metal powder into a molding space formed between the upper core and the lower core, A step of removing the internal structure forming mold by performing a degreasing process on the injection body and a degreasing step of removing the internal structure forming mold from the injection molding step and the degreasing step, And a sintering step of sintering the metal powder by heating the rough injection body.

Description

TECHNICAL FIELD [0001] The present invention relates to a metal member injection molding apparatus having an internal structure, an internal structure molding frame used therein, a metal member injection molding method using the same, and a metal member manufactured by the method. Member Using the Same and Metal Member Manufactured by the Same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal member injection molding apparatus for molding a metal member and a metal member injection molding method using the metal member injection molding apparatus. More particularly, 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, various internal structures for ensuring sufficient strength and stability often have complicated shapes, and there is a problem 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.

A metal member injection molding apparatus having an internal structure according to the present invention for solving the above-mentioned process comprises a plurality of shape portions forming a predetermined shape in a state of being spaced apart from each other by a predetermined distance, and a plurality of shape portions of adjacent ones of the plurality of shape portions, An inner structure forming mold formed of a fusible material, an upper core having an upper plate forming portion corresponding to an upper plate shape of the metal member to be formed, and a lower plate corresponding to the upper core, And at least one of the upper core and the lower core has a fixing part for fixing the inner structure molding die between the upper plate molding part and the lower plate molding part.

The width of the inner structure forming mold is formed to be longer than the width of the upper mold forming portion and the lower mold forming portion. The fixing portion is formed to correspond to the width of the inner structure forming mold, And may be formed so as to be stepped from at least one side.

Further, the shape portion may be formed in a hexagonal shape, and the connection portion may be formed to extend from at least one of the surfaces of the shape portion.

The width of the connecting portion may be shorter than the length of each surface of the shape portion.

And an auxiliary forming die formed to correspond to the lower plate shape of the metal member to be formed and inserted into the lower plate forming portion.

The auxiliary forming mold may include an insertion portion inserted into the hollow portion formed between the respective shape portions of the internal structure forming mold to a predetermined depth.

Also, the internal structure forming die of the present invention for solving the above-mentioned process includes a plurality of shape portions formed in a predetermined shape in a state of being spaced apart from each other by a predetermined distance, and a connecting portion connecting adjacent ones of the plurality of shape portions And is formed of a meltable material.

The shape portion may be formed in a hexagonal shape, and the connection portion may be extended from at least one of the surfaces of the shape portion.

Further, the width of the connecting portion may be shorter than the length of each of the surfaces of the shape portion.

Also, the metal member injection molding method for solving the above-described process includes a plurality of shape portions formed in a predetermined shape in a state of being spaced apart from each other by a predetermined distance, and a connecting portion connecting adjacent shape portions of the plurality of shape portions to each other, An upper core having an inner structure forming mold formed of a fusible material and an upper plate forming portion corresponding to an upper plate shape of a metal member to be formed and a lower plate forming portion corresponding to the lower plate shape of the metal member to be formed, Wherein at least one of the upper core and the lower core includes a lower core and a fixing part for fixing the inner structure molding die between the upper plate molding part and the lower plate molding part, A method according to claim 1, wherein the upper and lower cores An injection step of injecting metal powder into a molding space formed between the upper core and the lower core to inject the injection molded body 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.

Further, the metal member injection molding apparatus may further include an auxiliary forming die formed to correspond to a lower plate shape of the metal member to be formed and inserted into the lower plate forming portion, wherein the fixing step includes: Wherein the injection step includes a first injection step of injecting and injecting a first metal powder into a molding space formed between the upper core and the auxiliary molding die, And a second injection process in which the second metal powder is injected into the molding space formed between the upper core and the semi-finished product injection body to inject the semi-finished product, can do.

The first metal powder and the second metal powder may be selected so that they can be sintered under the same range of conditions.

The metal member injection molding apparatus having the internal structure of the present invention and the metal member injection molding method using the same have 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.

Fourth, there is an advantage that an internal structure of various shapes can be formed.

Fifth, when an auxiliary forming mold is used, the upper plate and the lower plate can be formed of different metals, and various products can be manufactured.

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;
FIG. 2 is a cross-sectional view illustrating a metal member injection molding apparatus according to a first embodiment of the present invention, in which an inner structure molding die is provided between an upper core and a lower core;
FIG. 3 is a cross-sectional view illustrating a metal member injection molding apparatus according to a first embodiment of the present invention, in which an inner structure forming mold is fixed between an upper core and a lower core;
FIG. 4 is a plan view showing in detail a detailed structure of an internal structure forming mold in the metal member injection molding apparatus according to the first embodiment of the present invention; FIG.
5 is a perspective view showing the entirety of a metal member injection-molding apparatus and a metal member manufactured by the metal member injection-molding method according to the first embodiment of the present invention;
FIG. 6 is a perspective view of a metal mold injection molding apparatus according to a second embodiment of the present invention, showing a state of the inner structure forming mold. FIG.
FIG. 7 is a cross-sectional view illustrating a metal mold injection molding apparatus according to a third embodiment of the present invention in which an auxiliary mold is fixed between an upper core and a lower core; FIG.
8 is a sectional view showing a state in which a first metal powder is injected to mold a semi-finished product, in the metal member injection molding apparatus according to the third embodiment of the present invention; And
FIG. 9 is a cross-sectional view illustrating a state where a semi-finished product injection body is fixed between an upper core and a lower core in the metal member injection molding apparatus according to the third 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, according to the present invention, 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 metal member molding according to the first embodiment of the present invention is shown. 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.

The upper core 110 and the lower core 120 include not only vertically positioned but also vertically oriented, and are not limited to the upper and lower portions.

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.

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

Also, the fixing method of the fixing portion can 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.

2, the width of the inner structure forming mold 200 is formed to be longer than the widths of the upper plate forming portion 112 and the lower plate forming portion 122, and the fixing portions 114, And is formed so as to be stepped from the forming portion 112 and the lower plate forming portion 122.

3, when the upper core 110 and the lower core 120 are engaged with each other, the upper plate forming portion 112 and the lower plate forming portion 122 The inner structure forming mold 200 can be fixed.

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.

Meanwhile, in the present embodiment, an injection path for injecting metal powder into the molding space is formed in the upper core 110, but this will be obvious to those skilled in the art and will not be described in detail.

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. The internal structure for improving the strength of the metal member can be formed by the internal structure forming mold 200 fixed to the fixing portion.

At this time, the internal structure may have various shapes. Among them, honeycomb type is known to have an ideal strength. However, the internal structure such as the honeycomb shape is complicated in its shape, so that it is difficult to form the metallic member.

FIG. 4 is a detailed view showing the detailed structure of the internal structure forming mold 200 according to the first embodiment of the present invention. 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. The connecting portion 230 extends from at least one of the surfaces of the shape portion 210 so that the shape portions 210 can be fixed to 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, it can be seen that the width of the connection part 230 is shorter than the length of each surface of the shape part 210, so that a hollow part 220 having a sufficient space can be secured between the shape parts 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 described above, the size and the number of the connection portions 230 can be variously modified, and thus, they can be appropriately selected and used according to the situation.

The inner structure forming mold 200 is formed of a material which can be melted at a high temperature, which is for facilitating demoulding and can be formed of a material capable of melting at high temperatures such as various polymer composites. More details are given later.

The metal member injection molding apparatus according to the present invention has been described, and a series of processes for manufacturing the metal member will be described below.

In the metal member injection molding method according to the first embodiment of the present invention, a fixing step of fixing the inner structure forming mold 200 between the upper core 110 and the lower core 120 is performed first. 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 into the hollow part 220 of the upper mold forming part 112, the lower mold forming part 122 and the internal structure forming mold 200, The metal powder is completely filled.

That is, since the molding space is entirely communicated without the isolated space by the hollow portion 220 of the internal structure forming mold 200, it is possible to fill the entire molding space even if only one side of the metal powder is injected.

The metal powder is formed into a product shape through this step, and the inner 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 body is separated from each core, and the injection body has a basic shape, but it is necessary to remove the internal structure molding body 200.

Thereafter, a degreasing step is performed to remove the internal structure forming mold by performing a degreasing process on the injection body. In this step, the injection body is introduced into the degreasing bath and the degreasing process is performed.

At this time, the degreasing process may be a method of melting the internal structure forming mold 200 by a chemical solvent, or a method of melting the internal structure forming mold 200 by heating to a temperature higher than the melting point of the material constituting the internal structure forming 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 forming mold 200 is completely melted and discharged to the outside of the injection mold. Specifically, since the metal powder is filled in the hollow portion 220 of the inner structure forming mold 200, the shape portion 210 and the connecting portion 230 are discharged through 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, if the area of the connection portion 230 is large or the number of the connection portions 230 is large, the discharge is easy, but it may affect the strength of the metal member.

On the other hand, the injection body from which the internal structure forming mold 200 is removed is also called a 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 body from which the internal structure forming mold 200 is removed is charged into the sintering furnace and heated to a temperature of about 1000 캜. It is to be understood that the heating temperature may vary depending on the melting point of the metal powder to be 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.

On the other hand, after the sintering step, the metal member may be further cooled.

FIG. 5 shows a state of the metal member 300 manufactured by the above processes. 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.

Particularly, in the present invention, since the inner structure forming mold 200 is melted and removed in the sintering step, the upper plate, the lower plate, and the partition 320 can be integrally formed. That is, compared to the conventional case where the respective components are separately manufactured and adhered to each other, a greatly improved strength can be obtained, and the metal member 300 can be manufactured only by one operation, thereby providing a stable yield.

As described above, in the case of the first embodiment of the present invention, the honeycomb-shaped hollow is formed due to the internal structure of the manufactured metal member. However, it goes without saying that the inner structure of the metal member may be variously formed depending on the shape of the inner structure forming mold.

6 shows a state of the internal structure forming mold 500 in the metal member injection molding apparatus according to the second embodiment of the present invention.

6, the internal structure forming mold 500 provided in the metal member injection molding apparatus according to the second embodiment of the present invention includes a shape 510 having a shape different from that of the first embodiment, a connection portion 530 ). Also, the shape of the hollow portion 520 is changed accordingly.

In this embodiment, it is confirmed that the hollow portion 520 is formed in a stepped shape according to the shape of the shape portion 510 and the connection portion 530. When such an inner structure forming mold 500 is used, the metal member to be manufactured subsequently may have the same columnar structure as the hollow portion 520 of the inner structure forming mold 500.

As described above, the metal member manufactured according to the present invention can form various structures according to the shape of the inner structure forming mold, in addition to the honeycomb-shaped hollow structure as in the first embodiment.

FIG. 7 shows a state in which the auxiliary forming mold 400 is fixed between the upper core 110 and the lower core 120 in the metal member injection molding apparatus according to the third embodiment of the present invention.

The metal member injection molding apparatus according to the third embodiment of the present invention shown in FIG. 7 is different from the first embodiment in that all the components are the same, but the auxiliary mold 400 is further provided. In addition, the metal member to be manufactured later may be formed of a different metal from the upper plate and the lower plate.

Concretely, the auxiliary forming mold 400 is formed so as to correspond to the lower plate of the metal member to be formed, and inserted into the lower plate forming portion 122 of the lower core 120. That is, when the auxiliary forming mold 400 is inserted into the lower forming part 122, the metal powder is filled only in the remaining space except for the space occupied by the auxiliary forming mold 400. The metal member to be manufactured can be made of a different metal from the upper plate and the lower plate.

In addition, the auxiliary forming mold 400 may include an insertion portion 410 to be inserted into the hollow portion formed between the respective shapes of the inner structure forming mold 200 to a predetermined depth. Accordingly, when the auxiliary forming mold 400 is inserted into the lower forming part 122, the metal powder can be filled up to a predetermined depth of the inner structure forming mold 200.

That is, depending on whether the insertion portion 410 is formed and the depth of insertion, the metal powder may be filled in the entire hollow portion of the inner structure forming mold 200, or may be filled only partially.

Hereinafter, a process of manufacturing a metal member made of a different metal from the upper plate and the lower plate using the auxiliary forming mold 400 will be described.

First, in the fixing step of the metal member injection molding method, a first inserting process of inserting the auxiliary forming mold 400 into the lower mold forming portion 122 as shown in FIG. 7 may be further included. At this time, the length of the insertion portion 410 of the auxiliary forming mold 400 in this embodiment is about half of the total thickness of the internal structure forming mold 200, so that the insertion portion 410 is inserted into the hollow of the internal structure forming mold 200 .

After the fixing step, an injection step is performed, and the injection step may include a first injection step, a second insertion step, and a second injection step.

As shown in FIG. 8, the semi-finished product injection molding body 610 is formed by a first injection process. Specifically, the first metal powder may be injected into the molding space formed between the upper core 110 and the auxiliary forming mold 400, and the semi-finished product injector 610 may be manufactured by injecting the first metal powder.

At this time, since the semi-finished product injection mold 610 is formed in a form excluding the space occupied by the auxiliary forming mold 400, it is possible to form part of the internal structure and any one of the upper plate and the lower plate of the metal member to be manufactured.

Next, a second inserting process of inserting the semi-finished product injection body 610 manufactured by the first injection process into the lower plate molding part 122 as shown in FIG. 9 is performed. In this process, the auxiliary forming mold is removed, and the semi-finished product injection body 610 manufactured by the first injection process is inserted into the lower forming part 122.

In this embodiment, since a part 620a of the internal structure is formed in the semi-finished product injection mold 610, it will be inserted into the hollow of the internal structure molding mold 200. [

Next, a second injection process of injecting and injecting the second metal powder into the molding space formed between the upper core 110 and the semi-finished product injection mold 610 is performed. That is, in this process, the second metal powder, which is different from the first metal powder, is injected into the molding space formed between the upper core 110 and the auxiliary forming mold 400, Can be produced.

In this embodiment, the first metal powder and the second metal powder each form a part of the inner structure of the metal member to be manufactured. However, depending on whether the insert 410 of the auxiliary forming mold 400 is formed, It is needless to say that only one of the powder and the second metal powder forms the internal structure of the metal member.

The subsequent steps of de-molding, degreasing, and sintering the injection molded body are as described above. However, since the first metal powder and the second metal powder need to be sintered under the same conditions in the sintering step, the first metal powder and the second metal powder can be sintered by a certain range of pressure and heat And the like.

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 are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

110: upper core 112: upper plate forming part
120: lower core 122: lower plate forming part
114, 124: Fixing portion 200: Internal structure forming frame
210: Shape 220: Connection
230: hollow part 300: metal member
400: auxiliary mold frame

Claims (13)

An inner structure forming mold formed of a fusible material and including a plurality of shape portions formed in a predetermined shape in a state of being spaced apart from each other by a predetermined distance and a connecting portion connecting the adjacent shape portions of the plurality of shape portions 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;
/ RTI >
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,
Further comprising an auxiliary forming die formed corresponding to a lower plate shape of the metal member to be formed and inserted into the lower plate forming portion. The method according to claim 1,
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. The method according to 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 The method according to claim 1,
Wherein the auxiliary forming mold comprises:
And an inserting portion inserted into the hollow portion formed between the respective shapes of the internal structure forming mold to a predetermined depth. delete delete delete An inner structure forming mold formed of a fusible material and including a plurality of shape portions formed in a predetermined shape spaced apart from each other by a predetermined distance and a connecting portion connecting adjacent ones of the plurality of shape portions to each other, And a lower core having a lower plate forming portion corresponding to the lower plate shape of the metal member to be formed and corresponding to the upper core, wherein at least one of the upper core and the lower core A metal member injection molding method using a metal member injection molding apparatus in which a fixing part for fixing the inner structure molding die is formed between the upper plate molding part and the lower plate molding part,
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;
Lt; / RTI >
The metal member injection molding apparatus further includes an auxiliary forming die formed to correspond to a lower plate shape of the metal member to be formed and inserted into the lower plate forming portion,
Wherein the fixing step comprises:
And a first inserting step of inserting the auxiliary forming die into the lower plate forming part,
Wherein the injection step comprises:
A first injection step of injecting and injecting a first metal powder into a molding space formed between the upper core and the auxiliary mold;
A second insertion step of inserting the semi-finished product formed by the first injection process into the lower plate forming part; And
A second injection step of injecting and injecting a second metal powder into a molding space formed between the upper core and the semi-finished product injection body;
And the metal member injection molding method. delete 11. The method of claim 10,
Wherein the first metal powder and the second metal powder are selected so that they can be sintered under the same range of conditions. delete

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