| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a different series of working processes and improve yield in producing a circular disk parts, eah having an asymmetric disk section and a shaft. SOLUTION: A piece of circular disk parts with a shaft like a crank shaft is formed from an intermediate material of a multi-stepped form having a main section h and a multi-stepped shaft section j via multiple cold forging processes. In this case, when the volume of the main section h is made asymmetric with respect to the center line, the volume ratio of a thick and thin parts is made substantially 2 to 1, different inclination angles are given to left and right lower faces e and f, where a multi-steppe shaft section j and a main section h are adjacent to each other in the course of the forming, and the inclination angle of the lower face e of the thin side is made larger than the inclination angle of the lower face f of the thick side, and forging is carried out to give different friction angles at the forging.
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