Forging method of diesel engine crank forge piece and crank near-net forming die

Abstract

The invention relates to the field of part manufacturing, in particular to a forging method of a diesel engine crank forge piece and a crank near-net forming die. The crank near-net forming die comprises a base, an outer die ring is arranged on the base, four forming die blocks are arranged in the outer die ring, the four forming die blocks are composed of inclined face forming die blocks and arc face forming die blocks, the inclined face forming die blocks and the arc face forming die blocks are symmetrically arranged in pairs, and a cavity with openings in the top and the bottom is defined. According to the method, the die is used, near-net forming of the crank head part of the crank blank is achieved through a local die forging forming method, and then the crank arm is rapidly formed in cooperation with a bending forging method. According to the method, the advantages of the two are combined, the produced crank forge piece has the advantages of being good in quality, high in precision, good in consistency and low in cost, the internal and external quality of a crank can be guaranteed, the size consistency of crank forge piece blanks is achieved, meanwhile, the rough machining allowance of the crank blanks is greatly reduced, and the raw material cost and the subsequent machining cost are reduced.

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