Abstract
Hot stamping operations of a quenchable steel sheet were included in progressive-die plate forging to produce a tailored high strength gear part without additional heat treatments. As process design for the inclusion, the former stages in the progressive-die operations for punching and trimming were cold stamping, and subsequently, resistance heating, blanking, forging and die quenching were performed. The plate was partially resistance-heated with a pair of electrodes to produce a tailored gear part having high strength teeth and a ductile remainder. The tooth portion was uniformly heated around 1050 °C in the transversal current direction, and a gear part having teeth having 520 HV2 in hardness was produced. The quality of the teeth was improved by hot semi-blanking with local compression and cold scrap removing. It is found that the combined process of plate forging and hot stamping is useful to produce ultra-high strength steel parts.
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