Apparatus for softening a selected portion of a steel object by heating
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United States of America Patent
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Jul 18, 2006
Issued Date -
N/A
app pub date -
Jan 28, 2004
filing date -
Jan 11, 1996
priority date (Note) -
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Abstract
Differential hardening apparatus for softening a portion only of a metal workpiece such as a die block consisting of apparatus for presenting a workpiece to a heat source which impinges heat directly on the workpiece and control means for causing the heat to be directed only long enough to soften only the portion which receives the heat so as to create a softened portion, such as the shank portion of a die block, and an unaffected hardened portion, such as the body portion of the die block.
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