JPH04168238A - Manufacture of parts of particle dispersed composite - Google Patents

Abstract

PURPOSE:To obtain parts of quality having high strength and reliability, at the time of pressurizing the stock of a particle dispersed composite and forming parts, by setting mesh parts made of ceramic fibers in a runner part into a forming cavity. CONSTITUTION:Mesh parts 8 constituted of ceramic fibers are set in a runner part 7 introducing molten metal into a cavity part 6 forming parts in a die 1. The shape of the mesh parts 8 is formed into a taper one in accordance with the shape of the runner part 7 to prevent their movement caused by the push of molten metal. Horizontal dies in the above state are put together; after that, the molten metal 10 of a particle dispersed composite alloy is filled on a lower punch 2 in the die 1; immediately, pressure P is applied by an upper punch 3; and, via the runner part 7, the molten metal is filled in the cavity part 6. At this time, impurities and the condensed lumps of the particles present on the surface and inside of the molten metal 10 are seized by the mesh parts 8, by which the parts 12 of the cleaned particle dispersed composite alloy can be obtd.

Description

[Detailed Description of the Invention] a. Industrial Field of Application The present invention is applicable to the case where a part is formed by pressurization using a particle-dispersed composite alloy material, and the particle agglomerates contained in the material and those caught during the process are The present invention relates to a method for manufacturing parts using a particle-dispersed composite material in which an oxide film is removed.

b. Conventional technology Conventionally, when manufacturing various parts using particle-dispersed composite materials, ceramic particles are added to a molten composite alloy and stirred to sufficiently disperse the ceramic particles, and then pressure molded or cast. things are being done.

In addition, ceramic particles and powders such as alloys are mixed first,
There is a method of applying hot mechanical stirring to kneading ceramic particles into the alloy powder to form a particle-dispersed composite material (mechanical alloying method).

In the conventional method, when manufacturing parts,
Once the alloy material serving as the matrix is in a melted state, an oxide film is generated on the surface. This oxide film reduces the strength of the product, so it is removed by skimming or other methods.

Alternatively, a method is known in which microbubbles of inert gas such as Ar are blown into the molten metal, and when the bubbles rise, impurities and oxides in the molten metal float to the upper surface of the molten metal, thereby cleaning the molten metal. (Gas Bubbing Pilt-rat
ion, G, B, F method).

C1 Problem to be solved by the invention However, it is difficult to remove the oxide film formed on the surfaces such as the sides and bottom of the mold, the impurities rolled into the molten metal, or the agglomerates of particles present in the molten metal as described above. cannot be removed by any method.

On the other hand, when the method of raising microbubbles of inert gas is applied to a particle-dispersed composite material, there is a problem that the particles in the molten metal that form the composite float up and are removed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing parts using a particle-dispersed composite material, which solves the above problems.

d. Means for Solving the Problems In accordance with the above object, the present invention provides a method for manufacturing parts by pouring molten metal of a particle-dispersed composite material into a mold. The above-mentioned problem has been solved by providing a method for manufacturing parts using a particle-dispersed composite material, which is characterized in that a mesh part made of ceramic fiber is fitted into the part.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a diagram illustrating the manufacturing procedure step by step, with 1 indicating a mold, 2 a lower punch, and 3 an upper punch.

The illustrated mold 1 is a horizontal mold, and the state in which one of the molds has been removed is shown.

6 is a cavity part for molding parts, 7 is a cavity part 6
This is the runner part that guides the molten metal. A mesh part 8 manufactured to match the shape of the runner part 7 is fitted into the runner part 7, as shown in FIG. 1(b).

The mesh part 8 is made of ceramic fiber, for example SiC.

Use a laminate of C fibers or a laminate of net-like fibers. The runner part 7
is formed so that the cross section on the side of the cavity part 6 is narrow, and the mesh part 8 is also formed, for example, in the second part, in accordance with this shape.
As shown in the figure, it is processed into a tapered shape. This prevents the mesh part 8 from being pushed by the molten metal and moving (from the upstream side to the downstream side).The roughness of the mesh part 8 allows the ceramic particles contained in the composite alloy to pass through. Larger than the particle size, 3-20% of the particle size
It's double.

After fitting the horizontal molds in this state, a molten metal 10 of a particle-dispersed composite alloy made of 82 alloy, etc., heated and melted at 650 to 850°C is poured into the mold 1, as shown in Fig. 1 (C). Fill on top of the lower bunch 2. This composite alloy includes SiC,
Ceramic particles such as 5isNa+Al1tox are dispersed therein. In addition, in order to prevent the molten metal from being rapidly cooled prior to pouring, the mold 1 and lower punch 2 should be
For the same purpose, the mesh part 8 is also heated to 300-900°C to remove moisture.

Immediately after pouring, use the upper punch 3 to
A pressure P of 0000/d is applied to fill the cavity part 6 through the runner part 7 with the molten metal. At this time, large impurities and particle agglomerates existing on the surface or inside the molten metal are captured by the mesh part 8 and remain inside or on the near side.

Thus, a part 12 of a cleaned particle-dispersed composite alloy can be produced.

Figure 3 shows the state of the part immediately after the mold is opened.

The parts themselves are separated by cutting at the boundary with the runner part 7.

Specific example 1 First, the mold 1 and the lower bunch 2 were heated to 300°C,
In addition, a mesh part 8 made of a laminate of Al gos fibers is heated to 800°C and set in the runner part 7 of the mold 1. The matrix is JIS 7 NO1 of 0-order^1 alloy, and ceramic particles 5iC (particle size A composite material (with a composite rate of 15-t%) of 1μ-) was heated and melted at 750°C, filled into the mold 1, and then pressurized with the upper punch 3 at a pressure of looOkgf/cj. . As a result, the mesh part 8 removed impurities, oxides, agglomerates of particles, etc. contained in the molten metal, and a part of excellent reliability and quality was replaced.

e. Effects of the Invention According to the method of the present invention, material cleaning, that is, removal of impurities, oxide films, particle agglomerates, etc., for particle-dispersed composite materials that cannot be processed by conventional G, B, and F methods. is almost completely possible. Therefore, we can increase the strength of the material and replace parts with reliable quality.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the procedure for manufacturing parts using the particle-dispersed composite material according to the present invention, Fig. 2 is a perspective view of a mesh part, and Fig. 3 is a diagram showing the mold after manufacturing the part by the method of the present invention. It is a perspective explanatory view showing an open state. 1... Mold, 2... Lower punch, 3...
Upper bunch, 6... Cavity part, 7... Runner part, 8... Mesh parts. Figure 1) (d) Figure 2

Claims (1)

[Scope of Claims] 1) In the case of manufacturing a part by pouring molten metal of a particle-dispersed composite material into a mold, a mesh part made of ceramic fiber is provided in a runner section to a cavity in the mold for molding the part. A method for manufacturing parts using a particle-dispersed composite material, characterized in that the manufacturing method is carried out by fitting. 2) The part made of the particle-dispersed composite material according to claim 1, wherein the cross-sectional shape of the mesh part is reduced to match the shape of the runner part on the downstream side of the molten metal flowing into the cavity. manufacturing method. 3) The method of manufacturing a component using a particle-dispersed composite material according to claim 1, wherein the mesh component has a mesh size that is 3 to 20 times the diameter of particles contained in the material.