中文摘要：

航天阀门大多属于回转体类零件，其加工过程中的装夹、定位方式不同于非回转体类零件加工中的“3—2—1”装夹定位。引入机器人学中微分运动矢量的概念，分析了车削加工中的基准误差及夹具误差，建立了基于状态空间方程的回转体类零件多工序加工误差传递模型。该模型揭示了加工误差、卡盘夹具误差和基准误差等在多工序加工过程中的产生、传递和累积规律。通过对国内航天企业某型号航天阀门壳体零件加工过程的实例分析，验证了该模型的有效性。

英文摘要：

Most astronautical valves are rotary parts. The clamping and positioning scheme m their machining processes is different from ＂3-2-1＂ positioning scheme used in the processing of non-rotary parts. By using the differential motion vector, a concept in robotics, this paper analyzes the datum error and fixture error in turning process. A method of stream of variation for rotary parts based on state space model,which reveals the rules of variation induction,transmission and accumulation among stations is built. The effectiveness of this model is validated by one case of the machining process of an astronautical valve shell used in a domestic made rocket.