关键词: 表面质量优化；流程图分析法；控制精度；容错度

Abstract: In the manufacturing process of body in white (BIW), the surface quality of BIW is easy to be caused due to the unstable position of parts and fixtures and some serious defects can also cause other risk problems. This paper expounds the solution to the problem of parts deformation caused by the mismatch of upper and lower manufacturing accuracy in the manufacturing process of a vehicle model, without new investment. In the process of analysis and investigation, the flow chart analysis method is used to identify the point of occurrence of the problem; In the process of solving the problem, on the one hand, improve the precision of low precision links, on the other hand, increase the fault tolerance of high precision links. Through the combined adjustment of these two aspects, and the surface quality defect is avoided, thereby reducing the higher rework cost and eliminating the risk point affecting the sealing of the wiring harness hole.

Key words: Surface quality optimization; Flow chart analysis; Positioning accuracy; Fault tolerance