JPH0350618B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a fiber composite metal material, and more specifically, to a method for manufacturing a fiber composite metal material that facilitates the penetration of molten metal into a fiber aggregate and provides sufficient adhesion between fibers and metal. It concerns the manufacturing method.

In recent years, the practical application of fiber composite metal materials has been studied to improve the strength and heat resistance of various structural parts. In particular, there is a strong demand for this practical application in automobile parts that require weight reduction.

Conventionally, as a method for manufacturing such fiber composite metal materials, a method has been proposed in which a fiber aggregate is placed at a predetermined location in a mold, and molten metal is poured into the mold at high pressure. However, in this method, pressure is applied to the molten metal while the molten metal surrounds or surrounds the fiber aggregate, which makes it difficult for the air present in the fiber aggregate to be discharged, and the molten metal permeates between the fibers. This has caused problems such as poor filling, gas holes and other casting defects in the casting, and poor adhesion between the fiber and the metal.

In addition, if the fiber aggregate is simply installed in the product cavity and no particular method of fixing it to the mold is adopted, for example, a method such as narrowing and fixing a part of the fiber between the mating surfaces of the molds may be used. If this was not done, the pressure applied to the molten metal would cause the fiber aggregate to shift in position, and the desired location could not be composited in some cases.

The present invention was made in order to solve the problems of the prior art described above, and it is possible to prevent the fibers from shifting in position, allow the molten metal to sufficiently penetrate between the fibers, and to obtain sufficient adhesion between the fibers and the metal. Another object of the present invention is to provide a method for producing a fiber composite metal material in which casting defects caused by air entrainment such as gas holes do not occur in the casting.

According to the present invention, the present invention provides a method for manufacturing a fiber composite metal material by placing a fiber aggregate at a predetermined location in a product cavity defined by a mold and pouring molten metal into the product cavity. An air vent is provided at the part of the mold that comes into contact with the fiber aggregate, and a vacuum pump is used to pump the air inside the product cavity through the air vent from suction and fixation of the fiber aggregate to the mold, to pouring of molten metal, and to solidification. This can be achieved by suctioning.

The present invention will be explained in detail below.

The fibers used in the present invention include alumina fiber, alumina silica fiber, carbon fiber,
Various materials such as boron fiber can be used. Which fibers to use can be appropriately selected depending on the wettability with the molten metal and the purpose of reinforcement.

The fiber aggregate can be formed or bundled into a predetermined shape by press-molding the fibers or by mixing the fibers with a binder to form a slurry and then vacuuming.

Various molten metals are used, but
Generally, light metals and light alloys such as aluminum, magnesium and alloys thereof are used.

Various casting methods can be applied, but pressurization is necessary to sufficiently penetrate the molten metal between the fibers, and pressure casting methods such as die casting and molten metal casting, in which high pressure is applied to the molten metal, are applicable. Law is preferable.

Next, the present invention will be explained with reference to FIG. 1st
The figure is a partial schematic diagram showing a first embodiment of the present invention, in which the fiber composite portion is present in the middle part of the outer periphery of the product. In FIG. 1, 1 is a mold, 2 is a product cavity, 3 is an air vent, 4 is a shoulder, and 5 is a fiber aggregate.

A fiber aggregate 5 is placed on a shoulder 4 in a product cavity 2 defined by a mold 1 with one end thereof in contact with an air vent 3. At this time, a vacuum pump (not shown) connects the air vent 3 to the conduit 8.
The fiber assembly 5 is fixed in the position shown in the figure by suctioning the air inside the product cavity 2 through the fiber assembly 5.
In this state, molten metal is poured into the product cavity 2, and the molten metal is pressurized by a pressure plunger (not shown). After the molten metal has solidified, the product is removed. Next, by applying reverse pressure to the air vent 3, burrs etc. that have entered the air vent 3 are blown away.
Prevent clogging of air vent 3.

2 and 3 are partial schematic diagrams showing other embodiments of the present invention. FIG. 2 shows the case where the fiber aggregate 5 is installed in the lower corner of the product cavity, and FIG. 3 shows the case where the fiber aggregate 5 is installed in the upper corner of the product cavity. A case is shown in which the fiber aggregate 5 is installed.

According to the present invention, since the fiber aggregate is fixed in a predetermined position by a suction action, when molten metal is poured and pressurized, the fiber aggregate does not shift its position, and the fiber aggregate can be placed at a desired location. It becomes possible to install.

In addition, the product cavity 2 is connected via the air vent 3.
Since the molten metal is poured and pressurized while sucking the air inside, the molten metal permeates between the fibers replacing the air existing between the fibers of the fiber aggregate 5, resulting in strong adhesion between the fibers and the metal. It will be done.

Furthermore, since the air in the product cavity 2 is exhausted through the air vent, there are no casting defects such as gas holes caused by air entrainment.

Embodiment An embodiment of the present invention will be described based on FIG. 4. In FIG. 4, 6 is a pressure plunger, 7 is a molten aluminum alloy, and 8 is a conduit.

With the mold 1 divided into upper and lower parts open, a fiber molded body 5 made of alumina-silica-chambered ceramic fiber (trade name Kao Wool, manufactured by Isolite Kogyo Co., Ltd.) is placed on the shoulder 4 of the mold. Perform the tightening. Next, sintered air vent 3 (pore diameter φ0.05mm)
While the air inside the product cavity 2 and the fiber molded body 5 is discharged outside the product cavity 2 by vacuum suction from the conduit 8 via the pressure plunger 6, the molten aluminum alloy (JIS AC8A) is introduced into the product cavity 2. A product was obtained by injecting and applying a pressure of 500 Kg/cm ² .

When this product was cut and the fiber composite part was examined under a microscope, it was found that the fibers and aluminum alloy had good adhesion and no pores were observed.

[Brief explanation of drawings]

FIGS. 1 to 4 are partial schematic diagrams showing embodiments of the present invention, respectively. 1... Mold, 2... Product cavity, 3... Air vent, 4... Shoulder, 5... Fiber aggregate, 6...
...Pressure plunger, 7... Molten aluminum alloy, 8... Conduit.

Claims (1)

[Claims] 1. In a method of manufacturing a fiber composite metal material by installing a fiber aggregate at a predetermined location in a product cavity defined by a mold and pouring molten metal into the product cavity, the metal in contact with the fiber aggregate is The method is characterized in that an air vent is provided in the part of the mold, and air in the product cavity is sucked through the air vent by a vacuum pump from suction and fixation of the fiber aggregate to the mold, to pouring of molten metal, and to solidification. Manufacturing method for fiber composite metal materials.