曲轴后部锻件原为自由锻型砧上制坯再进行模锻,后改为在模锻锤上一次锻造成型。在缩短生产周期、提高锻件质量的同时大大降低了锻件生产成本。曲轴后部锻件(图1)有一个高的凸台(φ34×48×7°),还有一个大平面(115.6×140×22)。锻造中既要解决凸台充满问题, The back of the crankshaft forgings was originally a free forging anvil on the billet and then die forging, die forging hammer later replaced by a forging molding. In shortening the production cycle, improve the quality of forgings at the same time greatly reducing the cost of production forgings. The rear crankshaft forgings (Figure 1) have a high boss (φ34 × 48 × 7 °) and a large plane (115.6 × 140 × 22). Forging in both to solve the problem of the boss is full,