JPS61296948A - Production of casting ingot - Google Patents

Abstract

PURPOSE:To obtain a defectless casting having no foam in the inside by spraying a molten metal in a vacuum and solidifying the pulverous semi-molten metallic powder in a casting mold. CONSTITUTION:A bar 6 for regulating the flow rate of the molten metal is moved after the inside of a vacuum vessel 1 is evacuated by a vacuum pump 2. The molten metal 8 is brought to a nozzle 4 for spraying by the pressure difference between the inside and outside of the vacuum vessel 1 when the passage to the nozzle 4 for spraying is opened. The molten metal is sprayed in said nozzle and the fine metallic powder 9 is formed. The fine metallic powder 9 is blown in the semi-molten state into the casting mold 3 and is solidified in the mold 3, by which the quickly cooled and solidified cast ingot 10 is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a method for producing an ingot, and more particularly to a method for producing an ingot that includes a step of spraying molten metal.

BACKGROUND OF THE INVENTION Conventionally, a method has been proposed in which molten metal is made into fine metal particles by a spraying means, and the particles are made into an ingot by a shaping means such as forging (for example, Japanese Patent No. 60-36631).

Problems to be Solved by the Invention However, according to the above-described conventional method, since the spray is performed using an inert gas such as argon, such a gas may be drawn in and pressure bonded. Therefore, cavities are formed inside the ingot, which may exist as defects and prevent desired properties from being obtained.

Therefore, the present invention aims to provide a method for producing an ingot that can produce a healthy ingot without any internal cavities.

Means for Solving the Problems This invention is characterized by the use of a vacuum container, in which molten metal is sprayed and the sprayed metal is guided into the mold in a semi-molten state, It is intended to solidify inside the mold.

Effects of the Invention According to the present invention, since molten metal is sprayed in a vacuum and semi-molten metal fine powder is solidified inside the mold, a sound casting without bubbles inside can be obtained.

Furthermore, since the fine metal powder is rapidly cooled in a semi-molten state, a supersaturated alloy without segregation can be easily obtained. Therefore, compared to conventional castings, it is possible to easily obtain castings that are superior in heat resistance and wear resistance, for example.

Embodiment FIG. 1 schematically shows an ingot manufacturing apparatus for carrying out an embodiment of the present invention.

This device includes a vacuum vessel 1 made of stainless steel or aluminum, for example, which is connected to a vacuum pump 2 such as a rotary pump or a diffusion pump.
For example, a high degree of vacuum of about 10-' Torr is applied. A mold 3 having a shape that correlates to the shape of the ingot to be obtained is arranged within the vacuum vessel 1. A spray nozzle 4 is introduced from outside the vacuum vessel 1 toward the mold 3 . A crucible 5 communicating with the spray nozzle 4 is provided, and a molten metal flow 11 adjustment rod 6 is movably provided in a path leading from the crucible 5 to the spray nozzle 4. Ruppo 5 is
It is heated by suitable heating means 7, inside which molten metal 8 is accommodated.

In the apparatus shown in FIG. 1, after the pressure inside the vacuum container 1 is reduced by the vacuum pump 2, the molten metal flow rate adjusting rod 6 is moved to open the passage to the spray nozzle 4.
Due to the pressure difference between the inside and outside of the molten metal 8, the molten metal 8 reaches the atomizing nozzle 4, where it is atomized to form a fine metal powder 9. This fine metal powder 9 is sprayed into the mold 3 in a semi-molten state and solidified inside the mold to obtain a rapidly solidified ingot 10.

Note that in order to obtain the energy of the spray of the molten metal 8 from the spray nozzle 4, in addition to utilizing the pressure difference between the inside and outside of the vacuum container 1, as described above, the surface of the molten metal 8 in the crucible 5 is used. The pressure may be positively applied by means such as pressurized gas.

Further, a rotation mechanism may be provided in association with the spray nozzle 4, thereby rotating the spray nozzle 4 during spraying. According to this, it is possible to prevent unevenness from occurring on the surface of the ingot 10, and to obtain an ingot with a uniform thickness.

The method of the present invention is suitable for obtaining rapidly solidified ingots of supersaturated solid solution alloys. For example, supersaturated alloys include aluminum, magnesium, nickel, zinc, etc. as main components, and elements such as zirconium, chromium, copper, magnesium, silicon, iron, etc. are dissolved therein. In addition, A1□oa, stc as nonmetallic particles are added to the above-mentioned alloy.
An ingot having ceramic particles dispersed therein can also be obtained satisfactorily by the method of the present invention. In particular, by dispersing such ceramic particles, an ingot with high wear resistance can be obtained.

In addition, the ingot obtained by the method of the present invention may be subjected to secondary processing such as forging and cutting when roughly precise dimensions are required.

Next, an experimental example based on this invention will be introduced.

In this experimental example, the apparatus shown in FIG. 1 was used. The inside of the vacuum container 1 was adjusted to a degree of vacuum of 1×1σ'7 orr by a vacuum pump 2 composed of a rotary pump.

As the molten metal 8, a material obtained by dispersing 10% by volume of 0.3 μm A1□O8 particles in a melted A1-2% ZR alloy was used. Mold 3 placed inside vacuum container 1
An iron one was used, and a release agent was applied to it.

The temperature of the molten metal 8, that is, the molten metal, was set to 690° C., the molten metal flow adjustment rod 6 was adjusted, and spraying was performed. When spraying,
The molten metal was thoroughly stirred.

Tensile test pieces were cut out from the obtained ingot 10, without heating,
A tensile test was conducted on the test piece after heating at each humidity of 100°C, 200°C, 300°C, and 400°C for 1 hour. For comparison, electrical soft aluminum wire was also tested under similar conditions. The results of these tests are shown in FIG.

As is clear from FIG. 2, the material according to the present invention showed almost no decrease in strength due to heating.

[Brief explanation of drawings]

FIG. 1 is an illustrative view showing an example of an ingot manufacturing apparatus for carrying out an embodiment of the present invention. FIG. 2 is a graph showing the decrease in strength due to heating of an ingot obtained according to the present invention and a comparative soft aluminum wire for electric use. In the figure, 1 is a vacuum container, 2 is a vacuum pump, 3 is a mold, 4 is a spray nozzle, 8 is a molten metal, 9 is a fine metal powder, and 10 is a rapidly solidified ingot. scolding 2 circles

Claims (3)

[Claims] (1) A method for producing an ingot, in which molten metal is sprayed in a vacuum container, the sprayed metal is introduced into a mold in a semi-molten state, and solidified inside the mold. (2) the molten metal is a supersaturated solid solution alloy;
A method for manufacturing an ingot according to claim 1. (3) The method for manufacturing an ingot according to claim 1 or 2, wherein the molten metal has nonmetallic particles dispersed therein.