A Rectangular Smelting Section Feeding Process of Electron Beam Cooling Hearth Furnace for Titanium or Titanium Alloy

Abstract

The invention discloses a feeding process for a rectangular smelting section of a titanium or titanium-alloy electron beam cold bed furnace. The feeding process comprises the following steps: stopping feeding after determining a section which needs feeding, shutting off an electronic gun which is responsible for scanning a smelting region, a refining region and a casting region of the electron beam cold bed furnace after all materials are molten until no molten metal at a pouring gate flows to a crystallizer of the electron beam cold bed furnace; keeping a length position of cast ingot unchanged, and keeping a liquid surface position in the crystallizer; starting performing feeding; if the feeding position is the head of the cast ingot, recovering the size of a pattern scanned by the electronic gun which is responsible for scanning the crystallizer after the feeding is completed, recovering scanning power of the electronic gun, shutting on the electronic gun which is responsible for the smelting region, the refining region and the casting region, and directly casting after the operation of the electronic gun is stable; and when the feeding position is the tail of the cast ingot, directly shutting off the electronic gun. The feeding process disclosed by the invention is simple in design, convenient in operation, good in using effect, and capable of effectively solving defects appearing in head and tail of rectangular plate blank, thereby greatly improving once yield of the cast ingot.

Description

technical field [0001] The invention relates to the technical field of rectangular smelting cross-section feeding of titanium or titanium alloy electron beam cooling hearth furnace. Background technique [0002] For the vacuum autoconsumption smelting (VAR) of titanium or titanium alloys, feeding is generally required at the end of smelting to reduce the depth of shrinkage cavity at the tail of the ingot and increase the yield of the ingot. The existing feeding process generally adopts step-by-step reduction of the melting current, and is carried out by means of small current and heat preservation. To use this feeding process, it is necessary to calculate the remaining electrode weight at the beginning of feeding, the current, voltage and time of each level, etc. Due to fluctuations in current, voltage, vacuum degree and other parameters during each furnace smelting, it is easy to cause the weight of the remaining electrodes to be insufficient when each furnace of titanium ...

AI Technical Summary

Problems solved by technology

However, at the initial stage of casting, the molten metal is easy to involve impurities and gas on the inner wall of the crystallizer into the head of the ingot to form pores (bubbles), and if feeding (insulation) is not performed after casting, it is easy to form risers, cross-section cracks, etc. casting defect

Generally, the method of cutting the head and tail is adopted to eliminate the influence of the defect on the subsequent processing, but this method will greatly reduce the yield of the ingot

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