机械系列产品大多具有半相似性质 ,级比的确定是系列产品设计的关键 ,且没有固定的方法 ,只能根据具体实例来分析计算。本文以加工中心专用夹具用液压夹紧缸系列产品为对象 ,在满足各约束条件的情况下 ,以液压缸产生的推力为基准量确定了级比。由此出发 ,确定了系列产品的各主参数 ,为该系列产品的后续设计奠定了基础。 Mechanical products are mostly semi-similar nature, the determination of the ratio is the key to product design, and there is no fixed method, only based on specific examples to analyze and calculate. In this paper, aiming at the hydraulic clamping cylinder products of the special fixture for the machining center, the grade is determined by the thrust generated by the hydraulic cylinder under the condition of satisfying each constraint condition. Based on this, the main parameters of the series of products were determined, laying a foundation for the follow-up design of the series of products.