JPS62183957A - Production of fiber reinforced metallic material - Google Patents

Abstract

PURPOSE:To easily obtain a fiber reinforced metallic material by melting a metal to constitute a preform by using a welding means and uniting and solidifying the preform. CONSTITUTION:Long fibers consisting of silicon carbide are used as inorg. reinforcing fibers and a molten Al alloy which is a matrix metal is brought into contact with the bundled fibers to form the wire-shaped perform 1 in a preform molding stage. The preform 1 is packed into the groove part provided to an Al alloy plate 2 and is so molded as to comply with the outside shape of the alloy plate 2 in the molding stage of the preform 1. The wire-shaped preform 1 molded in such a manner is heated by a TIG arc welding machine 3 successively from one end of the preform1 to melt the Al alloy then the molten Al alloy is solidified to unite the preform 1 in a combining state. The fiber reinforced metallic material is thus formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a fiber reinforced metal material (hereinafter referred to as FRM). The manufacturing method of the present invention can be used for ICL manufacturing of structural materials or mechanical parts.

[Prior Art] Conventionally, as a method for manufacturing FRM, a preform method using ceramic fibers whose surfaces are coated with metal is known. In this preform method, a preform is formed by coating the surface of ceramic fibers with metal using PvD, CvD, or other plasma spraying, and the obtained preform is placed in a mold and heated while being pressurized within the mold. This is a method in which the metal of the preform is melted or sintered to integrate it.

[Problems that the invention attempts to solve] FRMf'! than conventional preforms! The i-forming method requires heating and pressurizing in the mold, so it is possible to produce complex-shaped F
There are problems such as M cannot be provided and expensive equipment is required.

The present invention uses a preform, and the FR is made with 111 pieces of equipment.
The purpose of this invention is to provide a method for manufacturing an FRM in which M is (q).

[Structure of the Invention] (Means for Solving the Problems) The method for producing a U & miscellaneous reinforced metal material of the present invention includes a preform forming step in which the surface of an inorganic reinforcing fiber is coated with a matrix metal to form a preform; The method is characterized by comprising a molding step of arranging the molded preform into a certain shape, and a composite step of melting and solidifying the matrix metal constituting the preform using a welding device. It is something.

In the present invention, the metal constituting the preform is melted using a welding device, that is, a means called welding, and the preform is integrated and solidified to form an FRM. For this reason, F RM can be obtained very easily.

(Detailed explanation of the structure of the invention) The present invention includes a preform forming process, a molding process, and a compounding process.
Consists of culm.

The preform forming step is a step of coating the surface of the 11-free reinforcing fiber with a matrix metal to form a preform. Here, as the inorganic reinforcing fibers, long fibers and short fibers of alumina, silica, alumina-silica, boron, graphite, carbon, silicon carbide, glass, etc., or whiskers thereof can be used. As the matrix metal, metals that can be used as structural materials, such as aluminum, copper, and iron, are used. As before, preforming is performed using Pv
O, CVO, plasma spraying, etc. can be used. Preforming may be done by coating the outer circumferential surface of each of the 11 reinforcing fibers with a matrix metal, or by bringing molten metal into contact with a fixed number of 11 long fibers, for example. A thick wire-like preform may also be formed. The molding process is a process of molding the obtained preform into a certain shape.

This molding process involves, for example, placing a preform in the recess of a mold and forming it into a four-part shape by applying pressure, or filling the preform into a groove, recess, etc. of a metal part body and molding it into a fixed shape. In addition, the preform can be formed into a certain shape by winding the wire-shaped preform around the outer peripheral surface of the metal body.

In the composite process, heat is applied to the molded preform by a welding device to melt the matrix metal and integrate the preforms. Note that the molded preform can be partially heated by a welding device to partially melt and solidify the preform. or? It is also possible to apply pressure with a roller or the like while the metal is still soft, just after it has been melted or solidified. As a melting device, a conventionally known T
Equipment such as rG welding equipment, oxygen-hydrogen burners, electric welding, etc. can be used.

In the method for manufacturing a m-thread reinforced metal material of the present invention, preforms are integrated using a welding device. The F obtained for this
It is difficult to maintain at least the exposed surface of the RM to a predetermined level of smoothness. In such a case, it is necessary to perform machining after FRM molding.

[Embodiments of the Invention] In the first embodiment shown schematically in FIG. 1, silicon carbide long fibers are used as the inorganic reinforcing fibers in the preform forming process, and a large number of the long fibers, for example, approximately 500
All I bundled together in a bundle! Immediately after I, a relatively thick wire-shaped preform 1 was formed by contacting molten metal of an aluminum alloy, which is a 7-trix metal. In this example, the wire-shaped preform 1 formed as described above is stuffed into the groove provided in the aluminum alloy plate 2 during the pig growth process.
It was molded to match the external shape of. In the composite process, the wire-shaped preform 1 formed in this way is sequentially heated from one end of the wire-shaped preform 1 using a conventionally known TrG arc welding machine 3 to melt the aluminum alloy that is the matrix metal, Next, by solidifying, the W-V-shaped preform 1 was integrated, that is, formed into an FRM. In this embodiment, the TIG arc welding machine 3 is operated at 150 amperes and at a feed rate of 2.
．． It was operated at a flow rate of 5 ml/sec. In addition, the FRM part manufactured according to this example was cut out from the aluminum alloy plate and tested for characteristics such as bending strength. As a result, the bending strength was 62 kq/mm2, and the fiber volume fraction was 40%.
Met. Further, microscopic TllII observation of the structure of the preform after FRM conversion revealed that the aluminum alloy was sufficiently filled between the fibers and that the composite condition was extremely good.

(Example 2) FIG. 2 shows another example of the present invention. In the second embodiment, in the preform forming process, bundled carbon fibers are used as the inorganic reinforcing fibers, aluminum alloy is used as the 71-Rix metal, and ionized PVD is used among the conventionally known PVD methods. The preform was formed using the so-called ion blating method in which the surface of the reinforced m-fiber was coated with metal vapor. In the next molding process, the wire-shaped preform 4 thus formed (9) was wound around the groove formed in the outer peripheral surface 5 of the piston body of the internal combustion!! 1111 to mold the preform into a certain shape.Subsequently, In the compounding process, while slowly rotating the piston (for example, about 0.7 times/min), the conventionally known T
Heating the preform part using IG arc welding machine 3,
The aluminum alloy was melted, integrally welded to the groove of the piston body, and solidified. In this way, according to this example, it was possible to manufacture a mechanical component partially made of FRM. In particular, the carbon fiber used as the reinforcing material in this example has high strength and rigidity, and has a small coefficient of thermal expansion, so it is possible to effectively prevent thermal expansion of the piston by incorporating it in a ring shape on the outer circumferential surface of the piston. did it.

The fiber volume percentage in the FRM-integrated piston portion was 55%, and microscopic observation confirmed that the composite state was as good as in the first example.

In the above two examples, carbon fiber and silicon carbide GAH were used as the reinforcement am, but the invention is not limited to these. It's good too,
It goes without saying that metals that can be used as structural forest materials, such as copper and iron, can be used as the matrix metal. Furthermore, although a TIG welder is used as the welding device,
A conventionally known electric welding machine or the like can be used for this purpose.

[Effects of the Invention] As described above, the present invention uses a preform, and it is possible to obtain an FRM with simple equipment. In addition, in the composite process, the matrix metal constituting the preform is heated by conventional welding means to rapidly melt and solidify, resulting in a more dense metal structure.
Therefore, mechanical properties such as strength and elastic modulus are improved, and it is possible to manufacture an FRM with superior properties compared to conventional ones. Further, the manufacturing method of the present invention can be used for manufacturing structural materials or mechanical parts, and is easy to put into practical use.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view for explaining a first embodiment of the present invention. FIG. 2 is an explanatory diagram illustrating the essentials of the second embodiment of the present invention. 1...Silicon carbide II and aluminum alloy (AC4
G) Buri 7 Ohm Y V-2... Aluminum alloy (AC4G) plate 3... TIG arc welding machine 4... Preform wire 5 made of carbon fiber coated with aluminum alloy (AC8A)... Patent applicant for the outer circumferential surface of the piston body Toyota Motor Corporation vJ Hiba Co., Ltd. Agent
Patent Attorney Hirodo Okawa Patent Attorney Akio Maruyama

Claims (5)

[Claims] (1) A preform forming step in which the surface of inorganic reinforcing fibers is coated with a matrix metal to form a preform, a molding step in which the obtained preform is arranged in a fixed shape, and the formed preform is welded using a welding device. A method for manufacturing a fiber-reinforced metal material, comprising a composite step of melting and solidifying the matrix metal constituting the preform. (2) The method for manufacturing a fiber-reinforced metal material according to claim 1, wherein the preform is wire-shaped. (3) The method for producing a fiber-reinforced metal material according to claim 1, wherein the inorganic reinforcing fiber is alumina, silica, alumina-silica, boron, graphite, carbon, silicon carbide, or glass. (4) The method for manufacturing a fiber-reinforced metal material according to claim 1, wherein the welding device is a TIG arc welder. (5) The forming process is performed by placing the preform in a groove formed on the outer circumferential surface of the piston body of the internal combustion engine, and the compounding process is performed by heating the preform to melt the matrix metal and forming the piston body. The method for producing a fiber-reinforced metal material according to claim 1, wherein the fiber-reinforced metal material is melted and solidified integrally in the groove.