Method for heat-treating metallic workpieces

Details Method for heat-treating metallic workpieces Method for heat-treating metallic workpieces

C - Chemistry, Metallurgy

21

D

C21D 1/767 (2006.01) C21D 1/613 (2006.01) F27D 7/04 (2006.01) C21D 1/773 (2006.01)

Patent

CA 2341152

A method for heat-treating metallic workpieces, in which a flow of cooling gas is generated in a vacuum furnace by a fan in order to quench the workpieces, with the fan being driven by a rotary current motor that is operated with a predetermined supply voltage above a minimum pressure in the vacuum furnace which is determined with regard to the motor power of the rotary current motor. In order to additionally develop this method such that a simple and inexpensive improvement of the quenching effect is achieved, the fan is started at a pressure in the vacuum furnace which is lower than the minimum pressure, with the rotary current motor being operated with a second, lower supply voltage until the minimum pressure in the vacuum furnace is reached.

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