A small electric arc melting furnace

Abstract

The invention discloses a small electric arc smelting furnace, which comprises a vacuum furnace and an arc striking rod whose lower end is inserted in the vacuum furnace. Power supply connection, the bottom of the vacuum furnace is equipped with a number of water-cooled crucibles with molten metal pools, the metal molten pools are used to place metal melts, and the bottom of the water-cooled crucible is connected to the power supply through electrode terminals; among them, the small electric arc melting furnace also includes sleeves in the lead The metal bellows on the arc rod, and the lower end of the metal bellows is installed on the shell wall of the vacuum furnace, and the upper end is connected with the arc rod through the connecting piece; the metal bellows are also equipped with a bellows lower limit frame and a bellows upper limit The invention not only facilitates the operation and effectively reduces the complexity of the arc smelting operation process, but also significantly reduces the possibility of the reaction between the tungsten needle and the metal melt, and greatly improves the stability and success rate of the arc smelting process.

Description

technical field [0001] The invention belongs to the technical field of metal melting, and in particular relates to a small electric arc melting furnace. Background technique [0002] Arc melting is an electrothermometallurgical method that uses an electric arc generated between an electrode and a charge to melt metal. Normally, when the power supply provides enough power, the gas between the positive and negative poles can continue to pass through a strong current and emit a strong brilliance, resulting in a height of thousands or even tens of thousands of degrees Celsius. When the arc is strong enough, it can also generate a strong stirring effect on the melt in the crucible, which is conducive to the sufficient uniformity of the material. Due to the above advantages, arc melting is widely used in metal master alloy configuration and refractory alloy melting, especially in the process of research and development of new materials, the arc melting process is often used to pr...

AI Technical Summary

Problems solved by technology

However, at present, the arc striking rods of small electric arc melting furnaces produced in China mostly adopt the connection form of worm gear or threaded screw. The arc rod and the charge stick together, which eventually leads to arc ignition failure

Even if the operator turns the turbine or the threaded handle to raise the arc rod, it cannot keep it at a proper distance from the charge. If the distance is too small, the tungsten needle will easily react with the molten metal, thereby polluting the material. If the distance is too large, it will easily cause Melting failure due to arc interruption

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