JPH0648855A - Production of connected body - Google Patents

Abstract

PURPOSE:To obtain a connected body in which metal parts and ceramic parts are connected movably without subjecting to an assembling process after sintering by successively forming parts by injection molding in an assembled state, degreasing, and then sintering. CONSTITUTION:One of three kinds of materials, which are a metal, kneaded material of ceramic powder with org. binder, and a thermoplastic resin, is used to form a structural part by injection molding in a manner that the material used is different from the material used in the preceeding process. For example, parts 1 consisting of specified proportions of stainless steel powder a polystyrene, an acryl, and stearic acid, is formed by injection molding. Then, parts 2 consisting of specified proportions of alumina powder, a polyethylene, an amorphous polyolefin, and stearylalcohol is formed by insert molding method. Then the parts are degreased and sintered to form clearances 3 and 4. Thus, the connected body in which parts 1 and parts 2 are movable is obtd.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing metal powder or ceramic powder products.

[0002]

2. Description of the Related Art In the production of powder metallurgy and ceramics,
The method of molding metal or inorganic powder into a predetermined shape is
There are various types such as die molding, hydrostatic molding, hot pressing, tape molding, extrusion molding, and casting molding.

Among them, in recent years, a metal powder injection molding method or a ceramics powder injection molding method has begun to attract attention as a method capable of manufacturing a complicated shape relatively easily. For example, JP-A-59-22943 and JP-A-62-27.
As disclosed in Japanese Patent No. 0458, a metal powder or ceramic powder and an organic binder are kneaded, the kneaded body is injection-molded, and then the organic binder is removed (defatting).
Then, there is a method of sintering the degreased body to obtain a product.

[0004]

However, in the case of manufacturing a movable coupling body in the conventional method, whichever method is used to manufacture the component, it is necessary to assemble the metal or ceramic component after sintering. When manufacturing a movable connecting body, it is extremely difficult to secure a clearance in terms of design dimensions at the time of manufacturing, and a worker's can, tips, and know-how are required at the time of assembling. There is a problem that the cost to be generated in some cases becomes higher than the cost of parts itself, and the smaller the size of the connecting body, the higher the incidence of defective products during manufacturing becomes. Also had. Moreover, the advantage of the method is that the parts produced are of complex shape and are expected to become even more complex in the future, so that their assembly is becoming more difficult and even impossible to assemble in the near future. is there.

The present invention has been made in view of the above-mentioned conventional problems, and a clearance can be easily secured at the time of manufacturing a movable connecting body composed of two or more parts.
Moreover, it is an object of the present invention to provide a molding method for manufacturing without assembling.

[0006]

In order to solve the above-mentioned problems, the present invention provides a kneaded body of metal powder and an organic binder, or a kneaded body of a metal powder and an organic binder when manufacturing a joined body in which a metal part and a ceramics part are movably connected. A component is formed by injection molding using any one of the three materials of a kneaded material of ceramic powder and an organic binder or a thermoplastic resin, and then a component adjacent to the component. The material different from the material used in the previous step is selected from the above-mentioned three kinds of materials and injection-molded, and then the material different from the material used in the previous step is sequentially selected from the above-mentioned three kinds of materials to form the constituent parts. After injection molding, degreasing and sintering were performed to form a connected body of two or more components. Here, the component includes not only each component of the connected body but also a clearance and the like.

[0007]

In the manufacturing method of the above construction, the injection molded body is degreased and sintered at the final stage. At this time, the kneaded body of the metal powder and the organic binder and the kneaded body of the ceramic powder and the organic binder are: Due to its nature, it does not weld during sintering after degreasing. Further, the above-mentioned two kinds of kneaded bodies shrink due to the degreasing and sintering steps, but the shrinkage rate can be changed by changing the content rate of the organic binder. Further, in the case of a thermoplastic resin, it is completely removed by a degreasing and sintering process, and no trace of it remains.

That is, by using the method of the above construction, injection moldings of the respective orders are sequentially injection-molded so as to be in an assembled state, and during degreasing and sintering, shrinkage of the kneading body or removal of the thermoplastic resin is performed. By using it, it is possible to secure an appropriate clearance in the assembled state, and thus it is possible to obtain a connected body in which the respective parts are movable without going through the assembling process after sintering.

[0009]

[Embodiment 1] FIG. 1 is a vertical sectional view of a connecting body obtained in Embodiment 1 of the present invention. The parts A1 and B2 are connected to each other with clearances 3 and 4 provided at their sliding portions so as to be movable.

A series of manufacturing methods of this embodiment having the above-described structure will be described. First, stainless steel (SUS30
4) Part A consisting of 3 wt% polystyrene, 3 wt% acrylic, and 3 wt% stearic acid with respect to 91 wt% powder.
1 by injection molding, and then alumina (Al2O3
) A component B2 composed of 4 wt% of polyethylene, 3 wt% of amorphous polyolefin, and 3 wt% of stearyl alcohol with respect to 90 wt% of powder is molded by the insert molding method. Further, after molding, degreasing and sintering steps are performed to form clearances 3 and 4 to form a movable connecting body.

In this case, the parts A1 and B2 are not welded to each other in all of the above steps. In addition, each of the above kneaded bodies has the property of shrinking due to degreasing and sintering,
The shrinkage rate can be changed by the content rate of the organic binder. Its content is stainless steel (SU
S304) In the case of a kneaded body of powder and organic binder, the ratio of stainless steel (SUS304) powder is 80 to 95 wt.
% Must be set in the range of alumina (Al2O3
) In the case of a kneaded body of powder and organic binder, it is necessary to set the proportion of alumina (Al2 O3) powder within the range of 80 to 94 wt%. In the case of either kneaded body, if the content of stainless steel or alumina is below the lower limit,
Cannot be sintered. If the upper limit is exceeded, injection becomes impossible. Therefore, the clearances 3 and 4 adjust the content ratio of the organic binder so that a desired proper size is ensured by performing degreasing and sintering.

[0012]

[Embodiment 2] FIG. 2 is a vertical sectional view of a connecting body obtained in Embodiment 2 of the present invention. The parts A1 and B2 are movable, and the sliding parts are connected with clearances 3 and 4 and a part C5.

By repeating the same procedure while alternately changing the two kinds of materials described in the first embodiment, it is possible to form a connected body of three or more parts. The embodiment is based on FIG. To explain, stainless steel (SUS30
4) Part A consisting of 3 wt% polystyrene, 3 wt% acrylic, and 3 wt% stearic acid with respect to 91 wt% powder.
1 by injection molding, and then alumina (Al2O3
) A component C5 consisting of 4 wt% of polyethylene, 3 wt% of amorphous polyolefin, and 3 wt% of stearyl alcohol is molded into 90 wt% of the powder by using the insert molding method. Further, with respect to 91 wt% of stainless steel (SUS304) powder of the same material as the part A1, 3 wt% of polystyrene, 3 wt% of acrylic, 3 wt% of stearic acid.
The component B2 consisting of 10% is similarly formed by insert molding, and the movable coupling body is formed by performing the degreasing and sintering steps as in the first embodiment.

In this case, since the parts A1 and B2 are not in contact with each other and do not weld after degreasing and sintering, there is no problem even if they are made of the same material. The contraction action of the kneaded body is the same as described above. Furthermore, part C5
It is needless to say that the component A1 and the component B2 may be different materials as long as they are materials which are not welded to each other in all of the above steps.

[0015]

[Third Embodiment] By using a thermoplastic resin as the material of the component C5 described in the second embodiment, it is possible to secure the clearance by the removing action. The embodiment will be described with reference to FIG. A component A1 made of 3 wt% polystyrene, 3 wt% acrylic, and 3 wt% stearic acid is molded by injection molding with respect to 91 wt% of stainless steel (SUS304) powder, and then a part C5 made of wax is molded by an insert molding method. . In addition, 90 wt% of alumina (Al2 O3) powder was added to polyethylene 4
A part B2 composed of wt%, amorphous polyolefin 3 wt% and stearyl alcohol 3 wt% is molded by the insert molding method in the same manner, and can be moved by the degreasing and sintering steps as in the first and second embodiments. To form a large connected body.

In the first and second embodiments, the proper clearance is ensured by utilizing the contraction action of the kneading body. In this case, the wax component C5 is removed by the degreasing and sintering steps. , That part is the clearance. Therefore, an appropriate clearance can be secured by utilizing the action of removing the thermoplastic resin, and the same effect can be obtained. Similar to the second embodiment, by repeating the above procedure, it is possible to form a connected body of three or more parts.

[0017]

As described above, according to the method of manufacturing a connector of the present invention, the method of manufacturing a connector of two or more movable parts by injection molding, degreasing and sintering is used. No need for assembly work such as caulking, welding,
In addition, a complicated shape can be manufactured relatively easily, and various effects such as stable quality of the finished product can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a connecting body obtained in Example 1 of the present invention.

FIG. 2 is a vertical sectional view of a connecting body obtained in Example 2 of the present invention.

[Explanation of symbols]

 1 part A 2 part B 3,4 clearance 5 part C

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Sekine 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Innovator Naohito Shiga 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Michio Shirai 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Kenji Haga 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Inventor Jun Inahashi 2-34-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. When manufacturing a connected body in which a metal part and a ceramic part are movably connected to each other, a kneaded body of a metal powder and an organic binder, a kneaded body of a ceramic powder and an organic binder, or a thermoplastic resin is used. One component is molded by injection molding using any one of the materials, and then the component adjacent to the component is a material different from the material used in the previous step. And injection-molding, and then similarly selecting a material different from the material used in the previous step from the above-mentioned three kinds of materials in order to injection-mold the constituent parts, and then degreasing and sintering the two or more constituent parts. A method for producing a connected body, which comprises forming the connected body according to 1.