外套与芯子是自行车飞轮部件中的两个主体零件(参看图1)。过去的工艺是个体分序模锻,不仅工序繁多、生产周期长,而且钢材浪费也较大。现在是将外套和芯子两个锻件组合在一起锻造,并对整个材料进行充分套用,在一个毛坯上可套出四种零件(参看图2)。 Jacket and core are two body parts in a bicycle flywheel assembly (see Figure 1). The past process is individual sequencing forging, not only many processes, long production cycle, but also a large waste of steel. The two forgings of the jacket and the core are now forged together and the entire material is fully applied. Four parts can be put on a blank (see Figure 2).