真空アーク再溶解炉のマイコン操業について

概要

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Daidos Shibukawa Plant gives much more weight to high class steel and forgings and it has high class steelmaking plant from melting, remelting, forging, heat treatment to machining.Special melting and refining section has VIF, IF, PIF, four furnaces of ESR and four furnaces of VAR. In this section, the high grade steels and alloys such as superalloy, heat resisting alloy for aircraft, die steel and high speed steel are mainly produced with remelting method.Up to the present, this section has the three vacuum arc remelting furnaces of 2, 3 and 6ton, and the operation of these furnaces was controlled by an operator for each furnace.On the increasing chance of 10t VAR in 1981, the total control system with microcomputer was introduced into the operation of VAR.In this system the current could be controlled automatically and the current, voltage, vacuum level, electrode driving rate and the temperature of cooling water could also be measured and recorded automatically.The alarm of the abnormal operation is messaged to the operator when these values are over the control limit against the basic value.Introducing this system, it was possible to operate in the best melting condition, and also to produce the material of high quality stably. Additionally, the four furnaces of VAR by one operator could be operated.