基于JSS矩阵的装配精度分配方法

Assembly Accuracy Allocation Method Based on JSS Matrix

采用小位移旋量描述结合面误差,分析了典型结合面的误差传递属性。定义了结合面的信息集成表达符号,结合多色集合理论,建立了描述装配关系、结合面类型、结合面误差传递属性的结合面符号矩阵,进而提出了装配误差传递路径的搜索方法。分析了结合面间的关系对误差传递的影响,建立了结合面的实际误差传递属性矩阵,获取了各误差分量的传递路径,明确了影响装配体精度的关键误差分布。根据多体运动学原理建立了装配体误差模型,结合装配体精度要求进行了结合面精度分配,进而实现了结合面相应几何要素的精度分配。为正向公差设计与装配过程精度控制提供了依据。最后通过实例分析,验证了该方法的可行性与实用性。

Joint surface error was described by SDT, typical joint surface error transfer properties were analyzed. Information integrated expression symbols of joint surfaces were defined, combined with the polychromatic sets theory,JSS matrix, was established, that could describe assembly relationship,joint surface type and error transfer properties, and then assembly error transfer path search method was proposed, critical error distribution that affected the precision of assembly was identified. Assembly error model was established based on the multi-body kinematics principles, and combined with assembly accuracy requirements, the accuracy allocation of joint surface and the relevant geometric element were implemented, then the basis was provided for tolerance design and accuracy control during assembly process. At last, the feasibility and practicability of the proposed method was verified by example analyses.