Multi-frequency heat treatment of a workpiece by induction heating
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United States of America Patent
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Sep 1, 2015
Grant Date -
Nov 22, 2007
app pub date -
Aug 4, 2007
filing date -
Apr 21, 2004
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Abstract
An apparatus and process are provided for multi-frequency induction heat treatment of workpieces including gears. High frequency power is applied to an induction coil that surrounds the workpiece so that a high frequency magnetic field couples with the workpiece to inductively heat the workpiece. A C-core inductor is coupled to a coil that has low frequency power applied to it. The workpiece is inserted in a gap in the C-core inductor magnetic circuit so that it experiences low frequency Joule effect heating when the low frequency current is applied to the coil coupled with the C-core inductor. Alternatively the workpiece may be inserted around the C-core inductor when the workpiece has an opening.
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