Apparatus for melting metal by electron beams and process for producing high-melting metal ingot using this apparatus

Abstract

This invention provides an electron beam melting apparatus and a melting method that, in producing an ingot by dissolving a metal with an electron beam, can suppress the occurrence of new impurities in the ingot production, are less likely to again cause inclusion of once evaporated impurities from a melt pool within a hearth or a mold, and can be improved in operating rate. The electron beam melting apparatus for melting a high-melting metal comprises a raw material feed part for feeding a raw material, a raw material melting part, which is continued from the raw material feed part and, at the same time, is defined by a furnace wall and a ceiling wall, and comprises at least a hearth, a water cooling mold and an electron gun, and an exhaust part continued from the raw material melting part. In this electron beam melting apparatus, at least one of the furnace wall and the ceiling wall is lined with titanium or stainless steel, and, in addition, a plurality of fin-shaped members formed of titanium or stainless steel is provided in the ceiling wall. A lining, which can be attached and detached, is provided on the inner face of the electron beam melting apparatus.

Description

technical field [0001] The present invention relates to a device and method for melting high-melting-point metal ingots such as titanium, and more specifically relates to a device capable of suppressing contamination sources such as LDI (low-density inclusions) from being mixed into metal ingots and effectively increasing the operating rate of a melting furnace Electron beam melting technology. Background technique [0002] In the past, titanium metal was mostly used as materials or parts for aircraft, but in recent years, with the development of its use, it is also widely used for building materials, roads, sports goods, etc. [0003] In the past, the following method is usually adopted as the method for obtaining the metal titanium, which is to crush and granulate the sponge titanium produced by the Kroll reduction method (reducing titanium tetrachloride with metal magnesium to obtain titanium), and then combine multiple Metal titanium is obtained by melting it with a vac...

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Problems solved by technology

[0017] However, according to the method of Patent Document 1, although the time can be shortened to some extent, the situation that it takes a certain amount of time to clean the inside of the melting furnace has not changed. Solve the problem of low operating rate

In addition, the techniques described in Patent Documents 2 to 4 all trap titanium vapor or impurities volatilized from the titanium molten layer held in the hearth or mold on the top wall or before they reach the top wall. , they do all have the precipitation of solid matter, but it cannot be guaranteed that no solid matter falls into the molten pool according to the precipitation situation

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