Heat treatment apparatus and heat treatment method
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United States of America Patent
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Issued Date -
Jun 21, 2007
app pub date -
Nov 25, 2003
filing date -
Aug 19, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A heat treatment apparatus 10 comprises a supporting unit 20 for supporting a columnar workpiece 12 turnably, and an induction-heating coil 30 for induction-heating the workpiece 12 supported turnably by the supporting unit 20. Below the workpiece 12 supported by the supporting unit 20, a cooling tank 50 is provided which contains a liquid coolant. The workpiece 12 is made of steel such as carbon steel for mechanical structure, and spring steel. The workpiece 12 is made of a material which has a magnetic transformation point at 770.degree. C. The material is ferromagnetic below this temperature, and becomes paramagnetic above this temperature.
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