| 摘要 |
PURPOSE:To simplify a stage for producing a machine part and to obtain a part having excellent performance by forming roughly a steel material and subjecting the material to carburization hardening then subjecting the material to high frequency heating under specific conditions and to working at a specific reduction ratio. CONSTITUTION:A steel material is roughly formed and is then subjected directly to carburization hardening. The material is subjected to high frequency heating for 1-5min at 200-600 deg.C and is immediately thereafter subjected to warm forging at 20-80% reduction ratio, by which a machine part is completed. The precision working of the material is thus made possible without surface roughening and since there is no generation of oxide scale owing to hardening and tempering, a finish polishing stage is omitted.
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