CRANK SHAFT AND PROCESS FOR MANUFACTURING MATERIAL THEREFOR

摘要

It is intended to meet the strict product precision demand on crank shaft while easing the management of forming process. Preliminary machining step (S117) is added before primary mass balance measurement (S118) performed to form center holes on both end faces of shaped item for crank shaft. In the preliminary machining step (S117), cutting work is performed on a balance weight portion of the shaped item for crank shaft.