JPS62107851A - Manufacture of metal mold - Google Patents

Abstract

PURPOSE:To obtain a sound metal product having fine structure and no segregation without a degassing process by pouring a molten metal flow on a rotating disk to produce the fine metal particles and cooling forcedly for the particles under flying to a shifting base and/or in a pile of the particles on the base at piling and cooling them on the base. CONSTITUTION:The metal product is cooled forcedly by blowing gas jetting flow such as Ar gas, etc., under flying of the above-mentioned particles to the shifting base and/or in the pile of the particles on the base. It is desirable that this forced cooling executes to be about >=10<2> deg.C/sec of cooling rate for the piled metal product. In this way, as the growth of the crystallized grain is controlled, the metal product having very fine solidified structure is obtained, even if its thickness is very thick.

Description

[Detailed Description of the Invention] <Industrial Application Field>Kuchi's invention relates to a method for manufacturing metal articles obtained by turning a molten metal stream into fine particles using a rotating disk, depositing the fine particles on a moving substrate, and cooling the fine particles. It is something.

BACKGROUND OF THE INVENTION Metal articles are typically manufactured from ingots cast from molten metal.

However, ingots made by melting and casting technology have many drawbacks such as concentration segregation, impurity segregation, and coarse grain crystals, and even if they are subjected to hot processing such as hot rolling, hot forging, pressing, or extrusion, Also, defects in the first invoice 1~ will have an adverse effect on the metal article given to the final piece.

On the other hand, is it necessary to manufacture metal articles by molding and sintering metal powder using the powder metallurgy method? The necessary subsequent forming a5 and sintering steps are expensive.Therefore, it is desired to produce metal articles with a sound and fine structure by a simpler process.

<Means for Solving the Problems> In view of the deficiencies of the above-mentioned conventional methods, the present invention provides a method for manufacturing metal articles having a sound and fine metal structure through a simpler process than metal articles using rapidly solidified powder as a raw material. The purpose is to provide the following.

That is, the present invention allows a molten metal flow to flow down onto a rotating disk that is rotating at high speed, converts the metal flow into fine particles by the centrifugal force of the rotating disk, and further transfers these fine particles to a moving substrate while they are still solid. In the method for producing a metal article in which the deposited metal article is deposited and cooled, in order to increase the cooling rate of the deposited metal article, the metal fine particles are deposited on the metal article while they are in flight or/and are being deposited on a moving substrate. A method for producing a metal article, which is characterized by forcing the deposited metal article to cool by continuously blowing a gas jet stream onto the deposited metal article, preferably at a cooling rate of 102°C/or higher. It is characterized by being applied so that the

A generally known method for turning a metal stream into fine particles is to spray the metal stream with a high-speed gas jet stream, but this method requires a large amount of gas and is therefore not economical. Not desirable.

Therefore, in this invention, a molten metal stream is dropped onto a rotating disk that rotates at high speed, and the molten metal stream is scattered as fine particles by the impact force and centrifugal force on the rotating disk.

The scattered fine particles are then deposited on a moving substrate while they are not solidified and are cooled to produce a metal article. At this time, the structure of the deposited and solidified metal article is different from the conventional melting and casting structure, and is a structure in which each fine particle is aggregated, making it possible to obtain a healthy structure without temperature segregation or impurity segregation. It can be done.

However, simply depositing and solidifying the fine particles at this time makes it difficult for the fine particles to sufficiently remove heat during flight, and as the fine particles accumulate, the thickness of the metal article increases. As the particles gradually accumulate latent heat, the temperature of the resulting metal article increases.
This results in grain growth in the metal article.

Accordingly, in this invention, the cold 11'l of the deposited metal article is
To increase the speed, fine metal particles are
and forced cooling by continuously blowing a gas jet stream onto the metal article while it is being deposited on a moving substrate, preferably at a cooling rate of 102 fM. °C/% or higher.

As a result, grain growth of the deposited metal article can be suppressed, and even if the thickness of the metal article increases, it is possible to obtain a metal article with a very fine detour structure.

The metal articles produced in this invention are
] Compared to metal articles, it does not require a scraping process, and compared to melting and casting, it has a faster cooling rate, has a finer structure, and can obtain metal articles without segregation. be.

<Example> The present invention will be explained below with reference to Examples.

Using a #-Sj gold alloy with the components shown in Table 1, the molten metal was melted with a diameter of 300 mm after high-frequency melting in an Ar gas atmosphere.
m, 4000 ppm continuously on a rotating disk, and the impact force and centrifugal force at this time make them into fine particles, and at the same time, while blowing a flow of 2 atm Ar gas in the same direction as the flight direction of the fine particles, It was deposited and solidified to a thickness of 80#.

Table 1 Looking at the microscopic structure of the metal plate thus obtained, it showed a very fine structure, and the cooling rate was estimated to be about 103°C/x from the size of the primary Si grain size.

This metal article was heated to 450°C and rolled to
＃Processed to thickness.

The density of the h0 material thus obtained was extremely high at 99.7%.

Table 2 shows the mechanical properties of this processed material in comparison with cast materials of the same composition.

Table 2 From Table 2 above, it was found that the material of the present invention was superior to the comparative cast material in all of tensile strength, elongation, and hardness.

<Effects of the Invention> As described above, the metal articles manufactured by the method of the present invention do not require a degassing process compared to the metal articles made from powder in the prior art, and are more efficient than the melting and casting method. This is necessary because the cooling rate is fast and fine metal articles with no segregation can be obtained.

Claims (2)

[Claims] (1) A metal stream in a molten state is applied to a rotating disk, the metal stream is made into fine particles by the centrifugal force of the rotating disk, and these fine particles are applied to a moving substrate while they are not solidified, and are deposited and cooled on the substrate. The method for manufacturing a metal article is characterized in that the metal article is forcedly cooled by continuously blowing a gas jet flow onto the metal article during the flight of the fine particles to the moving substrate and/or during the deposition on the moving substrate. A method for manufacturing metal articles. (2) A method for manufacturing a metal article according to claim 1, characterized in that forced cooling is performed so that the cooling rate of the deposited metal article is 10^2° C./sec or more.