| The assembly accuracy for automobile body-in-white is an important factor that affects the performance of the automobile, such as sealing, NVH and appearance, etc. Certain factors including the design of car body products, manufacture deviation of parts, welding deformation, jigs and operations, etc. may affect composite deviation of car body manufacture. The unified positioning reference, which acts as a significant contributor to the aforesaid composite deviation, is also the important content in SE analysis for automobile products, throughout the whole production process of automobiles.As a key part of car body, the door is made of several complex-shaped sheet plates which are welded, glued and hemmed on the assembly line. The door, a sub-assembly of body-in-white, is most closely related to passengers. Therefore, making the deviation problem of the door well solved will provide guidance for the settlement of matching relationship of doorframes (face plates), thus further improving the quality of complete vehicle.In this paper, based on car door and analyze the general assembly flow, assembly process and the application of the robot in door assembly line. Next, we study the general design method and principle for the RPS through the analysis on positioning reference systems of foreign automobile companies. Meanwhile, various factors affecting the welding deviation of car body are analyzed systematically and theoretically. At the end, we adopt finite element analysis technology to analyze the influence of positioning reference on door assembly deviation, and put forward the optimization plan in the light of actual engineering situation to reduce the door assembly deviation. |
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