JPS5827023B2 - Manufacturing method of fiber reinforced composite member - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a fiber-reinforced composite member.

In general, mechanical parts are often required to have special mechanical properties that cannot be obtained from their constituent materials.

For example, sliding surfaces of light alloy members, surfaces exposed to high heat, etc. fall under this category.

The present inventors previously proposed a fiber-reinforced composite member in which a fiber molded body of arbitrary shape and bulk density was used as a means for achieving the above-mentioned partial reinforcement, and a light alloy molten metal was filled and composited as a matrix using a high-pressure solidification casting method. However, among these fiber-reinforced composite members, especially those in which a part of the matrix in the composite region of fibers and matrix is made of dissimilar metals, each part of the composite region is It has excellent properties such as being able to efficiently impart special mechanical properties and also being able to strongly bond dissimilar metal matrices together via reinforcing fibers.

An object of the present invention is to provide a method by which a fiber-reinforced composite member having such excellent properties can be produced relatively easily and quickly.

Then, the method of the present invention involves placing a fiber molded body in a casting mold,
A solid metal of different types serving as a matrix and a molten metal are arranged, and the solid metal is rapidly melted by heating means such as high-frequency induction heating, and at the same time, high hydrostatic pressure is applied to the molten metal to form the two metals into fibers. It is characterized by filling and compounding the body.

The fibers used in the present invention are inorganic fibers such as carbon fibers, crystallized glass fibers, silicon carbide fibers, and metal fibers. Among these fibers, fibers of arbitrary diameters and lengths are assembled to have arbitrary bulk density. It is used after being oriented in one direction or two-dimensionally and molded into the required shape.

Also, depending on the characteristics, a combination of several types of fibers may be used.

The combination of metals that form the matrix varies depending on the purpose, but for example, to improve the heat resistance and melting point of an aluminum alloy matrix, pure aluminum may be used.
Further, in order to improve the friction characteristics, a lead-tin alloy is used in combination.

Below, based on the drawings, the case of manufacturing a cylinder sleeve for an internal combustion engine by the method of the present invention will be explained. First,
As shown in FIG. 2, a lead-tin alloy plate 13 with a thickness of 2 to 3 inches and having numerous holes 12 is formed into a cylindrical shape, and this is integrated with the lower punch 15 of the casting mold 14 of FIG. Fit into the cylinder inner core 16.

Next, the outer peripheral surface of the lead-tin alloy plate cylinder was covered with a fiber molded body 17 formed into a cylindrical shape using crystallized glass fiber with a fiber diameter of 2μ to a bulk density of 0.5 g/ca, and a molten aluminum alloy (Japanese Industrial Standards symbol After pouring the AC'B material) 18, a high-frequency heating device H installed inside the core 16 heats the lead.
While rapidly melting the tin alloy plate 13, the upper punch 1
9. Move the lower punch 15 in the direction of the arrow to apply high hydrostatic pressure (for example, about 2.000 kg/ff1) to the molten metal to solidify and cast the cylinder sleeve 20 under high pressure.

In this case, the lead-tin alloy plate 13 as a solid metal rapidly melts under high hydrostatic pressure and diffuses into the fiber compact 17.

As shown in FIG. 3, the thus cast cylinder sleeve 20 has its inner surface reinforced by a cylindrical fiber molded body 17, and a part of the matrix of the molded body 17 is reinforced by the lead-tin alloy plate 13, and another part is reinforced by the matrix of the molded body 17. Since the main body of the cylinder sleeve 20 is made of an aluminum alloy, it has excellent sliding properties, wear resistance, and heat deformation resistance.

In addition, in the method of the present invention, measures such as using fiber moldings of different types or the same type with different bulk densities, or changing the shape of the mold, taking into account the difference in the rate of penetration of different molten metals into the fiber molding. It was found that compounding was performed more effectively when .

As described above, according to the present invention, dissimilar solid metals serving as a matrix and molten metal are placed in a casting mold via a fiber molded body, and the solid metal is rapidly heated by heating means such as high-frequency induction heating. At the same time as melting, high hydrostatic pressure is applied to the molten metal to fill and composite both metals into the fibrous molded body, so that the solid metal adjacent to the fibrous molded body is rapidly melted during the casting process and the molten metal is melted. The fibers are filled into the molded body in parallel with the metal and from a different direction, thereby ensuring a fiber-reinforced composite member in which a part of the matrix is composed only of different metals in the composite area of the fiber and matrix. can be cast into

In particular, in the present invention, one of the different metals serving as the matrix can be placed in a solid state in the casting mold, so operations such as positioning and solidifying the solid metal and the fiber molded body in the mold are easy. It can be carried out simply, quickly and accurately, and can appropriately provide fiber reinforcement even to parts of composite members with relatively complex shapes.

[Brief explanation of the drawing]

FIG. 1 is a casting explanatory diagram of a cylinder sleeve for an internal combustion engine cast according to the method of the present invention, and FIG. 2 is a perspective view of a lead-tin alloy cylinder used for casting the cylinder sleeve.
FIG. 3 is a perspective view of a portion of the cylinder sleeve. 1... Casting mold, 4... Fiber molded body.

Claims (1)

[Claims] 1. A solid metal of a different type and a molten metal are placed in a casting mold via a fiber molded body, and the solid metal is rapidly melted by heating means such as high-frequency induction heating, and at the same time, static water is added to the molten metal. A method for producing a fiber-reinforced composite member, which comprises filling and compounding both of the above-mentioned metals into a fiber molded body by applying high pressure.