在保证零件强度与刚度的情况下,为了减轻零件的重量使用不等壁管。不等壁管零件通常采用车削加工,为了降低生产成本,提高产品质量与生产效率、对自行车立管零件的加工过程及主要模具结构进行了研究,经过工艺试验,采用下料→缩口→退火→表面处理→拉管→平头→倒角的方法代替车削加工。生产实践表明:达到了预期目的,取得了较好的经济效益。 In ensuring the strength and rigidity of the case, in order to reduce the weight of the parts use unequal wall tube. In order to reduce the production cost and improve the product quality and the production efficiency, the processing of the bicycle riser parts and the main mold structure are studied. After the process test, the material cutting → shrinking → annealing → surface treatment → pipe → flat head → chamfering method instead of turning. Production practice shows that: to achieve the desired purpose, and achieved good economic returns.