JP3027657B2 - Manufacturing method of powdered sintered products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a compact from a mixture of a powder and a molding aid, removing the molding aid in a step of degreasing, and sintering to produce a sintered part. About.

[0002]

2. Description of the Related Art Sintered parts made of metal or ceramics have been rapidly developed by the practical application of powder injection molding technology. This technology uses an organic polymer material whose main component, generally called a binder, is made of thermoplastic resin or wax.
By molding a material kneaded with metal or ceramic powder with an injection molding machine, degreasing and sintering, it has the characteristic that even difficult-to-work and complicated three-dimensional parts can be manufactured with high precision and in large quantities. I have. Further, according to this method, since fine powder is used, a sintered part having a higher sintering density than a sintered part obtained by a general direct pressure pressing method and having excellent mechanical properties can be obtained. However, there are parts that cannot be formed by a single molding even with this method, or that require a very complicated mold structure in a single molding.

For this reason, there has been proposed a method of forming a divided body having a desired shape, and then assembling the divided body and sintering to obtain a part having a desired shape (Japanese Patent Application Laid-Open No. 60-1985).
-20675).

[0004]

According to this manufacturing method, it is possible to manufacture a complicated three-dimensional part made of metal or ceramics which is impossible or difficult with one molding. It was not possible to produce a sintered body composed of two layers of different materials for the parts.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to provide a complicated three-dimensional metal or ceramic part which is impossible or difficult to perform at one time. It is an object of the present invention to provide a method for manufacturing a powdered sintered product having two layers of materials and a method for manufacturing a powdered sintered product in which partitions are provided by ribs of different materials.

[0006]

In order to achieve the above object, the present invention provides: (1) a molded article having a desired shape from a mixture of a sinterable powder and a molding aid, assembling, and firing. In a method of manufacturing a sintered product for obtaining a part having a desired shape by sintering, a part made of two different materials whose inner layer material has a higher sintering temperature than a material used as the outer layer is formed by combining the part to be the outer layer with the inner layer. Is molded using the same mold, the shrinkage of the inner layer material is adjusted by adjusting the molding aid compounding ratio at that time, the inner layer parts are assembled, and after sintering, the sintered product and the outer layer It is characterized by assembling a molded part and resintering the assembled part to obtain a sintered part composed of two layers of desired different materials.

(2) A method of manufacturing a sintered product in which a desired shaped part is obtained by forming a divided body having a desired shape from a mixture of a sinterable powder and a molding aid, assembling and then sintering the divided body. An inner layer part is assembled by molding two layers of parts made of different materials whose sintering temperature is higher than that of the outer layer material using different molds for the outer layer part and the inner layer part. After the sintering, the sintered product and the outer layer molded product are assembled, and the assembled component is re-sintered to obtain a sintered component having two layers of desired different materials.

(3) A method for producing a sintered product in which a desired shaped part is obtained by forming a divided body having a desired shape from a mixture of a sinterable powder and a forming aid, assembling and sintering the divided body. A part made of two different materials whose melting point of the material used as the inner layer is higher than the sintering temperature of the material used as the outer layer.
The outer layer portion is molded using a mold, the inner layer part and the outer layer molded article are assembled, and the assembled part is sintered to obtain a two-layer sintered part of a desired different material. .

(4) A method for producing a sintered product in which a divided body having a desired shape is formed from a mixture of a sinterable powder and a forming aid, assembled, and then sintered to obtain a part having a desired shape. A feature is that the ribs of different materials are simultaneously buried and sintered at the time of assembling to obtain a part provided with a partition inside.

(5) A method for manufacturing a sintered product in which a desired shaped part is obtained by forming a divided body having a desired shape from a mixture of a sinterable powder and a forming aid, assembling and sintering the divided body. At the time of assembly, simultaneously embed and sinter ribs with different materials and filter function such as mesh or holes,
It is characterized by obtaining parts with partitions inside.

[0011]

According to the present invention, the outer layer portion and the inner layer portion are formed of different materials using the same mold, and the mixing ratio of the molding aid is adjusted so that the shrinkage of the inner layer material is increased. I do. Then, the inner layer component is assembled and sintered, the sintered product and the outer layer molded component are assembled, and the assembled component is re-sintered, thereby obtaining a sintered product having different materials for the inner layer and the outer layer.

The outer layer and the inner layer are formed using different molds with different materials, the inner layer part and the outer layer molded article are assembled, and the assembled parts are sintered to make the inner layer and the outer layer different. It is possible to obtain a sintered product of the material.

Further, a molded product is used for the outer layer portion, a non-molded product of a different material from the outer layer is used for the inner layer portion, and both are assembled and then sintered, whereby a sintered product of a different material between the inner layer and the outer layer is obtained. It is possible to obtain.

[0014] Furthermore, a sintered product in which a sinterable powder or a mixture of a powder and a molding aid is molded, and when combining the two, ribs of different materials are embedded and sintered to form a partition inside. Can be obtained.

As the ribs, for example, those having a filter function such as a mesh or a hole are embedded and sintered to obtain a sintered product having a partition therein.

[0016]

Embodiments of the present invention will be described below. As a specific example, a method of manufacturing a powder sintered product in the shape of an L-shaped tube as shown in FIG. 1 will be described. If a part having this shape is to be manufactured by injection molding, the mold structure becomes very complicated. Further, since a mixture of a metal or ceramic powder and a thermoplastic resin is used as a material, the fluidity is not as good as that of a general plastic, and it may be impossible to mold a component having a complicated mold structure. Therefore, a part can be obtained by molding a plurality of divided bodies having a desired shape, and assembling and then sintering.
This is to obtain a component composed of layers.

(Embodiment 1) In this embodiment, the material of the inner layer is made of alumina having an average particle diameter of about 0.8 μm, and the material of the outer layer is made of SUS316L having an average particle diameter of about 10 μm.
And The mixing ratio with the binder is set at 100: 115 (shrinkage ratio of about 22.5%) for the inner layer and 100: 78 (shrinkage ratio of about 17.5%) for the outer layer, and kneading is performed. The divided bodies 1 and 2 on the outer layer side and the divided bodies 3 and 4 on the inner layer side as shown in FIG. 2 are molded by an injection molding machine. Then, of these divided bodies, the divided bodies 1 and 3 and the divided bodies 2 and 4 are formed by the same mold. The same binder was used as the binder, but a binder having a high fluidity may be used as the binder on the outer layer side having a small mixing ratio.

Each of the divided bodies 1, 2, 3, 4 is 500
Degreasing at 24 ° C. for 24 hours. Then, first, the inner layer side divided bodies 3 and 4 are assembled as shown in FIG.
Sinter for 2 hours. Subsequently, as shown in FIG. 4, the outer layer-side divided bodies 1 and 2 are assembled outside the assembled inner layer sintered product 5 and sintered at 1350 ° C. and 1 hour to obtain powder sintering as shown in FIG. 1. Get the goods.

(Embodiment 2) In this embodiment, the material of the inner layer is made of alumina having an average particle size of about 0.8 μm, and the material of the outer layer is made of SUS316L having an average particle size of about 10 μm.
And The mixing ratio with the binder is 100: 11 by weight.
And kneaded, and as shown in FIG.
Then, the divided bodies 8 and 9 on the inner layer side are molded by an injection molding machine.
These divided bodies 6, 7, 8, and 9 are all formed by different molds. Although the same binder is used, a binder suitable for each powder material may be used.

Each of the divided bodies 6, 7, 8, 9 is 500
Degreasing at 24 ° C. for 24 hours. Then, first, the inner layers 8 and 9 are assembled as shown in FIG.
Sinter for 2 hours. Subsequently, as shown in FIG. 7, the outer layer side divided bodies 6 and 7 are assembled on the outer side of the assembled inner layer sintered product 10 and sintering is performed at 1350 ° C. and 1 hour to obtain powder sintering as shown in FIG. Get the goods.

Example 3 In this example, the material of the portion to be the outer layer was SUS316L having an average particle size of about 10 μm, and the mixture with the binder was kneaded at a weight ratio of 100: 11, as shown in FIG. The outer layer side divided bodies 11 and 12
Is molded by an injection molding machine. Also, the component 13 serving as an inner layer
Is a sintered product made of alumina or a product processed by another method. The divided bodies 11 and 12 on the outer layer side were heated at 500 ° C.
After degreasing with 4 hours, the inner layer component 13 is assembled as shown in FIG. 9 and then sintered at 1350 ° C. for 1 hour to obtain a powder sintered product as shown in FIG.

(Embodiment 4) In this embodiment, a part in which partitions are provided by ribs of different materials is obtained in the manufacture of an assembled sintered product.

First, SUS316 having an average particle size of about 10 μm
As a material, a mixture of the L powder and the mixture of the acrylic resin and the wax in a weight ratio of 100: 11 is used as a material, and the divided bodies 14 and 15 shown in FIG. 10 are molded by an injection molding machine. As shown in FIG. 11, the formed divided bodies 14 and 15 are assembled while embedding a rib 16 made of porous alumina, and heated to 500 ° C. at about 24 hours to degrease.
Sintering is performed at 1350 ° C. for about 1 hour. Alternatively, after the formed divided bodies 14 and 15 are degreased, they are assembled while embedding a rib 16 made of porous alumina as shown in FIG.
Sintering at 350 ° C. for about 1 hour may be performed.

[0024]

As described above, according to the present invention, it is possible to obtain a sintered product composed of two layers of different materials, which is a complicated three-dimensional component made of a metal or ceramics which is impossible or difficult at one time. . Further, according to this method, it is possible to obtain a sintered product that is a complicated three-dimensional component made of metal or ceramics that is impossible or difficult to be formed at one time, and that is provided with partitions by ribs of different materials.

[Brief description of the drawings]

FIG. 1 is a view showing the appearance of a powder sintered product obtained by the method of the present invention.

FIG. 2 is a diagram showing the divided body.

FIG. 3 is a view showing a state where an inner layer divided body is assembled.

FIG. 4 is a view showing a state in which a divided body of an outer layer is assembled to an inner layer sintered product.

FIG. 5 is a view showing a divided body of a powder sintered product.

FIG. 6 is a view showing a state where the divided body of the inner layer is assembled.

FIG. 7 is a view showing a state in which a divided body of an outer layer is assembled to an inner layer sintered product.

FIG. 8 is a view showing a divided body of a powder sintered product.

FIG. 9 is a view showing a state where an outer layer divided body is assembled to an inner layer part.

FIG. 10 is a view showing divided bodies and ribs of a powder sintered product.

FIG. 11 is a view showing a state in which a divided body and a rib are assembled.

[Explanation of symbols]

 1,2,6,7,11,12 Outer layer split 3,4,8,9 Inner layer split 5,10 Inner layer sintered product 13 Inner layer part 14,15 split 16 Rib

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C04B 35/64

Claims (5)

(57) [Claims] 1. A method of manufacturing a sintered product in which a divided body having a desired shape is formed from a mixture of a sinterable powder and a forming aid, assembled, and then sintered to obtain a part having a desired shape. A part made of two different materials whose inner layer material is higher in sintering temperature than the outer layer material is formed by using the same mold for the outer layer part and the inner layer part. By adjusting the compounding ratio so that the shrinkage of the inner layer material is increased, assembling the inner layer component, sintering, assembling the sintered product and the outer layer molded component, and resintering the assembled component to obtain a desired difference. A method for producing a sintered powder product, comprising obtaining a sintered component having two layers of material. 2. A method of manufacturing a sintered product in which a divided body having a desired shape is formed from a mixture of a sinterable powder and a forming aid, assembled, and then sintered to obtain a component having a desired shape. The inner layer material is formed of two layers of different materials having a higher sintering temperature than the outer layer material using different molds for the outer layer portion and the inner layer portion, and the inner layer component is assembled. After sintering, assembling the sintered product and the outer layer molded product, and re-sintering the assembled component to obtain a sintered component having two layers of desired different materials, thereby manufacturing a powder sintered product. Method. 3. A method of manufacturing a sintered product in which a divided body having a desired shape is formed from a mixture of a sinterable powder and a molding aid, assembled, and then sintered to obtain a part having a desired shape. Parts made of two different materials whose melting point of the material to be the inner layer is higher than the sintering temperature of the material to be the outer layer. The part to be the inner layer should be a sintered product or a part made of ingot material. Molding using a mold, assembling the inner layer part and the outer layer molded part, and sintering the assembled part to obtain a sintered part composed of two layers of desired different materials. Production method. 4. A method for manufacturing a sintered product in which a divided body having a desired shape is formed from a mixture of a sinterable powder and a forming aid, assembled, and then sintered to obtain a part having a desired shape. A method for producing a powder sintered product, characterized in that ribs of different materials are simultaneously buried and sintered at the time of assembling to obtain a part having a partition therein. 5. A method for producing a sintered product in which a divided body having a desired shape is formed from a mixture of a sinterable powder and a forming aid, assembled, and then sintered to obtain a part having a desired shape. A method for producing a sintered powder product, comprising simultaneously embedding and sintering ribs of different materials and having a filter function such as a mesh or a hole at the time of assembling to obtain a part provided with a partition therein.