JPS61284542A - Production of fiber reinforced composite metallic material - Google Patents

Abstract

PURPOSE:To develop a fiber reinforced composite metallic material which does not contain gas and obviates the buckling of the fiber reinforcing material by putting the fiber reinforcing material into a casting mold and preheating and pressurizing the reinforcing material then pouring a molten into the mold and pressurizing the molten metal while deaerating the same. CONSTITUTION:A cylindrical plunger 5 is mounted into the casting mold 1 having a heater 4 and is lowered until the bottom part thereof contacts with a base plate 3 of the mold 1 and the fiber reinforcing material 11 is charged therein. A retaining member 6 is mounted to the plunger 5 to press the material 11. Said material is heated up to the m.p. of the matrix metal by a heater 4, by which the gaseous components adsorbed thereto are desorbed. The plunger 5 is then pulled up and the molten matrix metal such as Al alloy is poured into the space between the inside surface of the material 11 and the casting mold 1. The molten metal is pressurized by the plunger 5 and while the remaining gas in the material 11 and the gas generated therein during preheating are vacuum evacuated, the molten matrix metal 12 is penetrated into the material 11 and is solidified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a fiber reinforced metal composite material in which a fiber reinforcement material is embedded in a matrix metal.

(Prior art) In recent years, fiber-reinforced metals have been developed in which fibers with high strength and high elasticity made of carbon, alumina, silicon carbide, etc. are used as reinforcement materials, and light metals such as aluminum and magnesium or alloys thereof are used as a matrix. Composite materials (hereinafter referred to as F
It's called RM. ) has been actively developed, and various FRM manufacturing methods related to this have been devised and used.

A pressure casting method is a typical method for manufacturing these conventional FRMs. In this method, as shown in FIG. 3, a preformed fiber reinforced material 23 is charged into a bottomed cylindrical mold 21 having a bottom plate 26, and after being preheated by a heater 22,
The matrix metal molten metal 24 is injected, and then the mold 2
In this method, the matrix metal is infiltrated into the fiber reinforced material under pressure using a plunger 25 fitted in the fiber reinforced material 1, and then solidified to obtain the desired FRM.

(Problems to be Solved by the Invention) A problem with this pressure casting method is degassing during pressurization. That is, the air and gas components in the mold interior space are degassed by natural degassing from a minute gap between the mold inner surface and the plunger as the plunger is pushed. If air remains in the charged fiber reinforced material, or if adsorbed gas components of the fiber reinforced material are gasified during high temperature heating when preheating the fiber reinforced material, if these are insufficiently degassed. , it is difficult for molten matrix metal to be press-fitted and penetrated into that part. Therefore, the mechanical strength of the FRM after manufacture becomes defective due to the unpenetrated portions, and the desired mechanical strength cannot be obtained, resulting in a decrease in manufacturing yield and an increase in cost.

In addition, in the conventional pressure casting method, the molten matrix metal is pressurized and infiltrated from the length direction of the fiber reinforced material, so the fiber reinforced material may buckle due to the pressure of the plunger, making it difficult to manufacture large FRMs. It was becoming difficult.

The present invention was made in view of the above problem, and is an FR material in which molten matrix metal is pressurized and permeated into a fiber reinforced material.
When manufacturing M, air and gas components do not remain in the mold space loaded with fiber reinforcement, buckling does not occur even when large fiber reinforcement is used, and it is possible to achieve numerical quality and large size. F of
It is an object of the present invention to provide a manufacturing method by which RM can be obtained.

(Means for Solving the Problems) The features of the present invention for achieving the above object are as follows:
In the pressure casting method, after charging the fiber reinforced material, a holding member is brought into contact with the upper surface of the reinforcing material, and molten matrix metal is injected between the side surface of the fiber reinforcing material and the inner surface of the mold to seal it, and the holding member or After or while vacuum degassing the air and gas components in the inner space of the mold occupied by the fiber reinforced material from at least one of the mold bottoms, the molten metal is pressurized and penetrated from the side of the fiber reinforced material. be.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are cross-sectional views showing an example of a manufacturing apparatus to which the method of the present invention can be applied. In the figure, a mold 1 includes a cylindrical mold body 2 provided with a preheating heater 4 on the outer periphery;
A bottom plate 3 forms the bottom of the main body 2. A cylindrical plunger 5 is fitted into the mold 1 so as to be slidable in the vertical direction, and a presser member 6 is slidably attached to the inner surface of the plunger 5 . The presser member 6 has a structure in which a partition member 7 is connected to a presser keyaki 9 via a reinforcing plate 8, and a vacuum exhaust hole 10 is formed through the center of the presser bar 9 along the axial direction. The exhaust hole 10 is connected to the reinforcing plate 8.
It communicates with numerous deaeration holes installed in the area. The partition member 7 is made of porous ceramics or a metal screen of 150 to 300 meshes, and is backed up by the reinforcing plate 8. Although not shown, the due east exhaust hole 10 opened in the presser bar 9 is connected to a vacuum exhaust device.

Next, the method for manufacturing an FRM according to the present invention will be explained as shown in FIGS. 1 and 2.
This will be explained based on the diagram.

First, only the plunger 5 is attached to the mold 1 with the presser member 6 pulled out, and is lowered until it comes into contact with the bottom plate 3. A fiber reinforced material 11 that has been preformed and has an increased bulk density is charged inside the plunger 5. Next, as shown in FIG. 1, the presser member 6 is attached to the plunger 5, and the fiber reinforced material 11 is pushed down until it comes into contact with the bottom plate 3. In this state, the fiber reinforcement material 11 is preheated within a temperature range from 300° C. or higher to the melting point of the matrix metal. Preheating to such a temperature allows the gas components adsorbed on the fiber surface of the fiber reinforcement material 11 to be released, and at the same time improves the wetting of the fiber reinforcement material 11 to the matrix-molten metal, making it easier for the matrix metal molten metal to penetrate. This is to ensure that. In addition, if the fiber reinforcing material deteriorates due to oxidation due to preheating, it is important to perform the preheating under an inert gas atmosphere.

Next, the plunger 5 is pulled up and the matrix metal molten metal is injected between the fiber reinforced material 11 and the inner surface of the mold 1 to fill the circumferential side of the fiber reinforced material 11 with the molten metal. 5 is lowered until the lower surface of the molten metal comes into contact with the upper surface of the molten metal, the area around the fiber reinforced material 11 is sealed, and then the air and gas components in the internal space of the mold l occupied by the fiber reinforced material 11, that is, the inside of the fiber reinforced material 11. The air and gas components generated during preheating are vacuum degassed. These gas components are discharged to the outside of the mold 1 through the partition member 7, the deaeration hole of the reinforcement Fi8, and the evacuation hole 10 of the presser bar 9.

Thereafter, the plunger 5 is lowered to pressurize the molten metal 12, so that the molten metal 12 is pressurized and penetrated from the circumferential side of the fiber reinforced material 11. In addition, pressurizing the matrix metal molten metal is as follows:
The plunger 5 may be lowered to pressurize and infiltrate the molten metal, not only after the air in the mold 1 is vacuum degassed, but also while performing the vacuum deaeration.

According to this method, the fiber reinforced material 11 does not buckle due to the pressure of the plunger 5, which is particularly advantageous when obtaining a large-sized molded product. Of course, the air around the fiber reinforced material 11,
Since there is no gas component, etc., a high-quality composite material in which the fiber reinforcing material 11 and the matrix metal are well bonded can be obtained.

M) After the IJ Fuchs molten metal has completely penetrated into the fiber reinforced material, wait for it to solidify and cool down, then remove the bottom plate 3 and push it out from the top. The FRM of the period is obtained.

(Effect of destination) As explained above, according to the present invention, the fiber reinforcement material is charged into the mold, then the matrix metal molten metal is poured,
Pressure is applied to the reinforcing material. Since the air inside the mold and the gas components generated during preheating are vacuum degassed before +a or while pressurizing and permeating, the area where the molten matrix metal does not permeate can be reduced as much as possible.
Furthermore, the matrix metal and the fiber reinforcing material are in better (adhesion) contact, thereby improving mechanical properties, improving product yield, and reducing costs.

In addition, since the matrix gold i molten metal is pressurized and infiltrated from the side of the fiber reinforced material, it is pressurized and penetrated from the length direction of the fiber reinforced material.
Compared to the case of permeation, the fiber reinforced material does not collapse due to buckling, and large-sized FRMs can be manufactured easily.

[Brief explanation of the drawing]

Figures 1 and 2r! IJ is a cross-sectional view of the manufacturing equipment in the process of implementing the method of the present invention. Figure 1 shows the state during preheating after charging the fiber reinforcing material, and Figure 2 shows the state during vacuum heating after pouring the molten matrix metal. FIG. 3 shows a sectional view of a manufacturing apparatus in a conventional pressure casting method. DESCRIPTION OF SYMBOLS 1... Mold, 5... Plunger, 6... Holding member, 1°... Vacuum exhaust hole, 11... Fiber reinforced material, 12
...Matrix metal molten metal. Patent applicant: Kobe Steel, Ltd. Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A method for manufacturing a metal composite material, in which a fiber reinforced material is charged into a mold and preheated, and then a matrix metal molten metal is injected, and the molten metal is pressurized to penetrate into the fiber reinforced material, comprising: After charging the reinforcing material, a presser member is brought into contact with the upper surface of the reinforcing material,
A molten matrix metal is injected and sealed between the side surface of the fiber reinforced material and the inner surface of the mold, and air and gas components in the inner space of the mold occupied by the fiber reinforced material are removed from at least one of the pressing member or the bottom of the mold using a vacuum. A method for producing a fiber-reinforced metal composite material, which comprises applying pressure to the molten metal and allowing it to penetrate from the side surface of the fiber-reinforced material after degassing or while degassing under vacuum.