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Experimental studies were carried on the inlet valve 85Cr18Mo2V work pieces which have head cracks with electric upsetting by the means of OM, SEM and EDS. By numerical simulation of the forming process of intake valve of 85Cr18Mo2V, the optimized parameters of electric upsetting forming were obtained. The simulation result shows that the optimized electric upsetting process can guarantee the quality of the inlet valve: defects such as surface cracks, folding disappeared, the internal organization of valve were even and micro crack disappeared.

Forming Process of Inlet Valve 85Cr18Mo2V by Electrical Upsetting Forming