Electric induction heat treatment
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United States of America Patent
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Dec 1, 2020
Grant Date -
Jan 22, 2009
app pub date -
Jul 19, 2008
filing date -
Jul 21, 2007
priority date (Note) -
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Abstract
An induction coil with inner and outer coil segments joined together by a transition segment is arranged so that the outer coil segment generally inductively heat treats an annular outer region of a workpiece positioned under the coil, the inner coil segment generally inductively heat treats an annular inner region of the workpiece, and the transition segment traverses at least a portion of the width of the overall annular region of the workpiece to be heat treated. Relative arrangement of inner, outer and transition coil segments provides for controlled induction heat treatment across the overall annular region such as the gear teeth region of an intersecting axes or non-intersecting and non-parallel axes gear.
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