中文摘要：

将工件-夹具系统用机构模型表示。夹具是机构的机架,夹具和工件的接触副构成了连架杆与机架连接的运动副,定位基准到定位接触点之间的尺寸线为机构的连架杆,工序基准与定位基准之间的联系尺寸是机构中间连杆或机构的结构杆件,工件加工表面与工序基准之间的工序尺寸为机构的最终目标构件。通过计算目标构件的长度变化或角度变化获得工序系统的定位误差。研究建立工件和夹具定位元件接触副与机构构件之间的映射关系,研究建立加工表面与工序基准的工序尺寸关系、工序基准和定位基准之间的联系尺寸关系转化为等价机构的转换规则。根据以上映射关系和转换规则,实现等价机构模型的自动建立,利用机构学的各种精度分析方法实现定位误差求解的自动化。

英文摘要：

Workpiece-fixture system was represented by mechanism model,where fixture was the frame of the mechanism,the contact pairs between workpiece and locators constructed the kinematic pairs between side links and mechanism frame.The dimensional lines between location datum and location contact point become the side links,the dimensional lines between process datum and location datum become middle links or mechanism structure,and the process dimensional lines between workpiece surface and process datum were the objective links of the mechanism.By calculating the length and angle variation of objective links,the location errors of process system were obtained.The rules mapping from contact pairs to mechanism components were established.By analyzing the position relations between machining surface and process datum and the position relations between process datum and location datum,the rules controlling the conversion from dimension relations to equivalent mechanism components were explored.According to the mapping rules mentioned above,an equivalent mechanism model was established automatically,and the automatic solution of location error can be realized by means of the accuracy analysis methods of mechanism.