Scanning induction hardening process by using radially moving induction coil
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United States of America Patent
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Apr 14, 1992
Grant Date -
N/A
app pub date -
Feb 27, 1990
filing date -
Feb 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A scanning induction hardening process in which a steel workpiece is surface hardened by progressively traversing its length with an inductor coil energized by an alternating electric current and immediately thereafter quenching the heated portion of the workpiece straightening of bends in the workpiece being surfaced hardened being controlled during the induction hardening process by monitoring the straightness of the workpiece and utilizing information thereby obtained to control the heating and quenching of the workpiece is such a manner that a layer of hardened material of greater thickness is formed on the concave side of any bend in the workpiece such as to produce a straightening moment acting to remove the bend characterized in that the inductor coil is shaped to heat only a portion of the circumference of the work piece, or shaped to concentrate more heat in one portion of the circumference, and the speed of rotation of the work piece is varied to allow the concave side of the work piece to remain in the concentrated heating area longer, and thus, upon quenching, to receive a deeper martenistic layer on this side.
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