中文摘要：

贮油缸组件是轿车减振器的三大组件之一，传统结构是在贮油缸底部过盈压装一个底盖并焊接密封，以便密封内部的油液和气体。传统工艺在完成该工序的产品往往因过盈压装而产生难以清除的铁屑，影响减振器的清洁度；同时因压装难以保证底盖端面与贮油缸的垂直度，致使减振器使用过程中发生活塞杆偏磨，过早漏油失效而降低其使用寿命。针对以上存在的问题，通过对产品工装模具优化设计，具体包括：优化底盖和贮油缸配合关系，将原过盈配合关系变为间隙配合；优化设计底盖缩固工装等，从而杜绝在装配过程中铁屑的产生和提高底盖与贮油缸垂直度，最终达到降低减振器异响故障率，延长产品使用寿命的目的。具体的应用及产品质量检验的结果表明本模具优化设计方案是合理、可行的。

英文摘要：

Storage cylinder is one of three components of car shock absorber. The traditional structure is that a bottom cover is installed at the bottom of the storage cylinder and the bottom cover is welded and sealed so that the oil and gas can be sealed. Due to interference pressing, the traditional process is difficult to remove the iron filings in the completion of the process of products; therefore the clean degree of shock absorber is affected easily. Meanwhile, it is difficult to ensure the verticality of the end face and the storage cylinder cover during the pressing process. As a result, the plug rod is partial wear, leakage happens early and its service life is cut off. To solve the above problems, through the optimization design of product mold, the specific contents included： optimizing the relationship between bottom cover and storage cylinder, and changing the original interference fit into the gap fit; optimal design of a pyknosis device of the bottom cover so as to prevent producing iron filings in the assembly process and improve the verticality of bottom cover and its storage cylinder, with a result of reducing the abnormal sound fault rate of shock absorber and prolonging the life. The results of the application and product quality test show that the optimization design is reasonable and feasible.