一零件的工艺性分析自行车中接头(图1)是自行车车架上的一个主要零件。它是连接车架的主梁、斜梁和两根后叉的接头,而且是脚踏主轴的定位管。其形状比较复杂,有六个孔,尺寸和角度都有一定的精度要求。我们在设计和制造模具时,采用了聚氨酯橡胶胀形和钢珠翻边工艺,取得了良好的效果。 One-piece technical analysis The bicycle hub (Figure 1) is a major part of a bicycle frame. It is connected to the frame of the main beam, inclined beam and the two rear fork joints, but also the positioning of the spindle spindles. Its shape is more complex, with six holes, size and angle have a certain accuracy requirements. We used the polyurethane rubber bulging and ball turning process in the design and manufacture of mold, and achieved good results.