薄板件多工位装配尺寸误差建模与仿真

Dimension error modeling and simulation for multistation assembly of sheet metal parts

为保证薄板件装配尺寸精度,分析了两种主要误差源夹具尺寸误差和零件尺寸误差,尤其是定位销误差与零件孔间隙对装配尺寸误差的影响.采用状态空间法建立了薄板件多工位装配尺寸误差传递模型,并以某汽车地板薄板样件为例,运用所建立的尺寸误差模型对薄板样件进行仿真计算,仿真结果与实际测量结果进行对比,验证了模型的正确性和实用性.该模型可应用于多工位装配尺寸误差源诊断、装配过程夹具优化设计和装配过程稳定性分析等.

In order to ensure the dimensional accuracy of the assembly of sheet metal parts, we analyzed two main error sources- the fixture dimension errors and the part dimension errors- especially the effect of the positioning pin error and the part＇s hole clearance on the assembly dimension error. The dimension error transmit models for multistation assembly were built based on the state space method. By using the established model to simulate the automobile floor sheet samples, the simulation results were compared with the actual measurement results. The correctness and practicability of the model was verified. This model can be applied to the dimension error source diagnosis, the fixture optimization design, and the stability analysis of multistation assembly processes.