JP2002283005A - Method for controlling molten metal casting quantity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique with which bubbling when the molten metal is poured, is prevented and a cast product made of metal-ceramics composite material can be obtained with high yield. SOLUTION: When the metal-ceramics composite material composed of the ceramic powder or the ceramic fiber as a reinforcing material and an aluminum or an aluminum alloy as a matrix, is cast, the bubbling is prevented when the molten casting metal is poured, by arranging the aluminum or the aluminum alloy-made orifice having smaller hole diameter than a sprue diameter in the sprue of a sand mold to control the molten metal casting quantity at the initial stage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the amount of casting metal when casting a metal-ceramic composite material.

[0002]

2. Description of the Related Art In recent years, metal-ceramic composite materials, which are as lightweight as aluminum and have excellent features such as high rigidity as cast iron and steel, have been frequently used in various fields. Here, as a mold structure used for casting the metal-ceramic composite material, a mold structure based on the encapsulation method has been used. The enclosing method is
A method widely used to manufacture small and medium-sized castings. The upper mold and the lower mold made of sand are stacked to form a mold structure. The surface where both molds meet is called a split surface. The casting metal is poured from a sprue, flows into a mold through a runner, is cast, and after cooling, the mold is divided from the split surface to take out the product.

[0003]

However, since metal-ceramic composite material casting metal has a high viscosity, when casting into a conventional mold structure, especially when casting a high product, it is necessary to perform the casting in the early stage of casting. Is poured at a large flow rate, so it is easy to entrain air, and the bubbles generated thereby remain in the product without disappearing, sometimes causing defects exceeding 10 mm, and it is impossible to obtain cast products with high yield. There are issues.

SUMMARY OF THE INVENTION The present invention has been made intensively to solve the above-mentioned problems, and has been made to prevent the generation of bubbles at the time of pouring of casting metal and to provide a casting made of a metal-ceramic composite material. The purpose is to provide technology that can be obtained at high yield.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to control the amount of casting metal used for casting a metal-ceramic composite material using ceramic powder or ceramic fiber as a reinforcing material and aluminum or an aluminum alloy as a matrix. The method is achieved by a method of controlling the amount of casting metal, wherein an orifice made of aluminum or an aluminum alloy having a diameter smaller than the diameter of the sprue is provided in the sprue of the sand mold.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. Known ceramics such as alumina, aluminum nitride, and SiC can be used as the ceramics in the present invention.
C is most frequently used.

Next, in the present invention, the aluminum alloy is A
It is preferable to use an l-Si-Mg-based aluminum alloy because the wettability with ceramics is improved and uniform dispersion in a casting is possible.

In the present invention, an orifice made of aluminum or an aluminum alloy having a diameter smaller than the diameter of the gate is provided in the sand gate. The reason is that when pouring the pouring water from the sprue, the orifice diameter is small at the beginning of pouring, so that the pouring water is slowly supplied to the casting mold through the runner, and the conventional pouring water falls at once. This is because bubbles do not occur. Also, the diameter of the orifice gradually melts and gradually widens, so that the casting metal becomes the same as the initially designed one, and the amount of casting metal becomes stable.

(Embodiment) FIG. 1 shows a schematic longitudinal sectional view of a mold structure made by putting sand used in the embodiment. Here, 1 is an upper mold, 2 is a lower mold, and 3 is a surface (split surface) where both molds meet. 4 is a gate, 5 is a runner, and 6 is an aluminum orifice having a diameter smaller than the diameter of the gate of the present invention. Reference numeral 7 denotes a feeder.

[0010] Into the mold having the above-described structure, a casting liquid of an aluminum alloy-SiC composite material containing 30% by volume of SiC is poured from the gate 4 to a length of 200 mm, a width of 200 mm, and a thickness of 55 mm.
mm of a cast made of an aluminum alloy-SiC composite material.

As a result of observing the surface and the fracture surface of the obtained cast product by silent observation, there were no defects such as bubbles.

[0012]

According to the present invention, it is possible to prevent the occurrence of bubbles during the pouring of molten metal and to obtain a cast product made of a metal-ceramic composite material at a high yield.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a mold structure according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper mold 2 Lower mold 3 Split face 4 Sluice 5 Runner 6 Orifice 7 Feeder

Claims (1)

[Claims] 1. A method for controlling the amount of casting metal used for casting a metal-ceramic composite material using ceramic powder or ceramic fiber as a reinforcing material and aluminum or an aluminum alloy as a matrix. A method for controlling the amount of casting liquid, comprising providing an orifice made of aluminum or an aluminum alloy having a small diameter.