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换向拨叉是柴油机的重要零件,用18CrNiWA优质合金结构钢制成,锻件图见图1。该零件属于枝叉类锻件,形状比较复杂,很多地方不能进行机械加工,需用模具锻造保证尺寸。但用模锻方法锻造,金属不易充型,不用说用模锻成型,就是制坯也很困难。我们是在750公斤空气锤上自由锻造制坯,然后在5吨模锻锤上终锻成型。自由锻制坯是采用了几种方案试锻的,经过多次试验锻造,终于找到了我们认
The reversing fork is an important part of the diesel engine, made of 18CrNiWA high-quality alloy structural steel, forgings see Figure 1. The part belongs to the branch fork forgings, the shape is more complex, many places can not be machined, the need for die forging to ensure size. But forging die forging method, the metal is not easy filling, needless to say by forging molding, is the billet is also very difficult. We are free forging the billet on a 750 kg air hammer and final forging on a 5 ton die forging hammer. Free forging billet is the use of several programs forging, after many trials forging, we finally found the