JPS61202769A - Production of fiber reinforced composite material - Google Patents

Abstract

PURPOSE:To separate surely and easily a matrix metal by depositing preliminarily a parting material to the contact boundary between a fiber molding and the molten matrix metal and pouring a molten metal under pressure into a cavity. CONSTITUTION:The parting material such as graphite dispersed in water is preliminarily deposited on the contact boundary S between the fiber molding 4 and the molten metal M. The molding 4 is installed in the cavity 3 and upper and lower metallic molds 1, 2 are mated to hold the molding 4. An injection sleeve 9 is fitted into a hole 8 of a base 11 and pressurizing force is acted by plunger tip 10 to the molten metal M. The matrix metal is penetrated into the fiber molding 4 by which the composite material is formed. A brittle layer region is formed at the boundary between the composite material 5 and the matrix metal 6 by the combination of the graphite and metal. The unnecessary matrix metal part is thus surely and easily separated with light impact by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for manufacturing a fiber-reinforced composite material, and more specifically, it relates to a method for manufacturing fiber-reinforced composite materials. to be able to separate,
The present invention relates to a method for manufacturing a fiber reinforced composite material that reduces the number of processing steps required for separation such as cutting.

In order to improve the strength, abrasion resistance, etc. of conventional technical products, fiber-reinforced composite materials are known in which a fiber molded body is composited into a metal as a matrix. One of the methods for manufacturing such fiber-reinforced composite materials is the molten metal forging method as shown in Figures F and T. In this method, a fiber molded body 4 is placed in a cavity 3 formed by a fixed mold 1 and a movable mold 2, and the remaining molten metal is injected into the cavity under pressure until the molten metal completes solidification. Products are manufactured by applying pressure.

However, in order to obtain a product made of fiber-reinforced composite material 5 having a desired shape, it is necessary for the molten metal to penetrate into the fiber molded body 5 →
Since a predetermined volume of the matrix metal portion 6 with a sufficient contact area is required, the fiber-reinforced composite material 5 and the matrix metal portion 6 are removed from the mold as a product after solidification, with the fiber-reinforced composite material 5 and the matrix metal portion 6 still bonded. Therefore, the matrix metal portion 6, which is no longer needed, is usually cut away mainly by a mechanical angle ζ in a subsequent process.

Problems to be Solved by the Invention Requiring machining to remove the above-mentioned unnecessary matrix metal portion is extremely disadvantageous in terms of time and cost, and furthermore, the bonding area is As the shape of

It goes without saying that the disadvantageous coal loading will naturally increase.

The present invention seeks to solve the problem of simply separating the waste matrix portion from the product without resorting to machining.

Means for Solving the Problems In order to solve the above problems, the present invention provides the following steps: a separating agent is applied in advance to the contact interface of the fibrous molded body with the molten metal;
The combination of the matrix metal and this spacing agent creates an extremely brittle layer at the boundary between the fiber-reinforced composite material and the matrix metal portion.An aluminum-based metal is used as a typical preferred example of the fiber-reinforced composite material. Alumina fiber, alumina silica fiber, silicon carbide fiber, etc. are used for the body. In this case, as the separating material, graphite or carbon fiber is selected, which is not compatible with the matrix metal and has a large difference in expansion coefficient. For graphite, for example, earthy graphite is dispersed with water, phosphorous graphite is dispersed with alcohol and then coated or sprayed, and carbon fiber is applied in the form of chopped or cross-shaped materials through an inorganic binder such as alumina sol or colloidal silica. be done. It is also possible to omit the use of the binder by laying the carbon fibers in a molding frame in advance during the production of a fiber molded body so that mechanical entanglement occurs between the carbon fibers and the fibers of the molded body.

Effect: A composite of a spacing agent and a matrix metal is placed at the boundary between the fiber-reinforced composite material and the IJ Lux portion. The resulting stratification has low bonding strength due to the poor wettability of the spacing agent to the matrix metal, and there is also a large difference in expansion coefficient between the spacing agent and the matrix metal.
The stress acting on the stratification during solidification cooling or heat treatment is also large;
The resulting product breaks from the stratification with a light impact and is easily separated into the fiber reinforced composite and the Mar-IJ Lux portion.

EXAMPLES Hereinafter, examples of the present invention will be explained with reference to the drawings. The figure shows a mold apparatus used in the method for manufacturing fiber reinforced composite materials of the present invention, and the mold consists of a fixed mold 1 and a movable mold 2. The movable die 2 is attached to a movable die base 12 connected to a vertical movement means (not shown). Then, by combining the above molds 1 and 2, mold 1.2 is formed.
An inner cavity 3 is formed. The fixed mold 1 is formed with a molten metal lower that communicates with the cavity 3, and an injection sleeve 9 is fitted into a fitting hole 8 formed in the die base 11 in communication with the molten metal lower. - A plunger tip 1n is provided in the plunger q so as to be movable back and forth.

The injection sleeve 9 can be moved up and down together with the plunger tip 10 by a driving means (not shown), and can be removed from the fixed mold 1. Furthermore, by tilting the sleeve 9, the molten metal M is poured from a ladle (not shown). It can be injected.

After injecting the molten metal M into the injection sleeve 9 from the ladle, the injection sleeve 9 is fitted into the fitting hole 8 as shown in the figure, and the plunger tip 10 is raised to inject the molten metal M into the cavity 3. The molten metal M can be injected into the molten metal M, and at the same time, a predetermined pressing force can be applied to the molten metal M.

In order to manufacture a fiber-reinforced composite material using the mold apparatus as described above, first, a spacing agent, for example, dispersed in water, is applied to the contact interface S of the fiber molded body 4 made of silicon carbide whiskers with the molten metal M. After spraying graphite in advance and placing it on the snow at a predetermined position inside cavity 3, mold 1.
This fiber molded body 4 is held by bringing together the two. Next, the injection sleeve 9 that has received the molten metal M of, for example, an aluminum alloy (), C4C) is set as shown in the figure.
Another driving means (not shown) [Plunger tip 1]
0 is raised and the molten metal M is injected into the cavity 3 through the molten metal lower. When pressure is applied by the plunger tip 10, the molten metal M penetrates between the constituent fibers of the fiber molded body 4. ``The molten metal M thus injected into the cavity 3 is cooled and solidified under pressure.

After solidification, the movable mold 2 is opened and the product is taken out by an extrusion means (not shown). 6 is integral with −ζ
Although they are in a bonded state, in the present invention, the fragile layer region formed by the composite of graphite and aluminum alloy coated on the fiber molded body 4 is a bond between the fiber reinforced composite material 5 and the matrix metal portion 6. Intervening at the border. This layer region has low bonding strength due to poor wettability of graphite with the aluminum alloy, and there is a large difference in the expansion coefficient, so stress acting on this layer region during solidification cooling or heat treatment added as necessary. is also extremely large. Therefore, the produced product can be broken from the layer region by a slight impact, and the fiber-reinforced composite material 5 and the matrix metal part 6 can be easily formed into the desired shape.
and can be easily separated.

Effects of the Invention Since the present invention has the above-mentioned configuration, it is possible to manufacture a fiber-reinforced composite material in a desired shape by simply applying a spacing agent to the fiber molded body placed in the mold. The matrix metal parts, which are necessarily produced in a bonded state, can be reliably and easily separated by applying only a light impact, and the machining process that conventionally required an amount of time for this separation can be completely omitted. Note that this effect is even more pronounced when the shape of the boundary between the fiber-reinforced composite material and the matrix metal portion is complicated.

[Brief explanation of drawings]

The figure is a cross-sectional front view showing a mold device used in the method for manufacturing a fiber-reinforced composite material of the present invention. DESCRIPTION OF SYMBOLS 1... Fixed mold, 2... Movable mold, 3... Cavity, 4... Fiber molded object, 5... Fiber reinforced composite material,
6... Matrix metal part, 9... Injection sleeve, 10... Plunger tip

Claims (2)

[Claims] (1) In a method of manufacturing a fiber-reinforced composite material by installing a fiber molded body in a cavity of a mold, applying pressure into the cavity, injecting a matrix metal molten metal, and permeating the matrix metal molten metal into the fiber molded body. , characterized in that a separating agent is applied in advance to the contact interface of the fibrous molded body with the molten matrix metal, and a fragile layer region is generated at the contact interface by the combination of the molten matrix metal and the separating agent. A method for manufacturing a fiber reinforced composite material. (2) The method according to claim 1, wherein the matrix metal is an aluminum metal, and the spacing agent is graphite or carbon fiber.