Heat Treatment of Metal Work Pieces
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United States of America Patent
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Issued Date -
Aug 14, 2008
app pub date -
Mar 29, 2006
filing date -
Apr 18, 2005
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Abandoned
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Abstract
The invention relates to a method for heat-treating metal work pieces, whereby a cooling gas flow is produced in a vacuum furnace by means of a fan, driven by a three-phase AC motor, in order to quench the work pieces. The aim of the invention is to improve the heat treatment of metal work pieces in such a manner as to improve the quenching in a simple and inexpensive manner. For this purpose, the three-phase AC motor comprises first three-phase windings designed for a lower supply voltage and second three-phase windings designed for a higher supply voltage. The three-phase AC motor is operated with the first three-phase windings until a minimum pressure defined in terms of the motor output is reached in the vacuum furnace and with the second three-phase windings until a minimum pressure defined in terms of the motor output is reached or exceeded in the vacuum furnace.
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