关键词: 烘烤变形；前车门总成；外观间隙面差；改善策略

Abstract: The baking deformation of door spraying process has always been a complex and difficult problem in the industry. In order to solve this problem, this paper puts forward the effective improvement countermeasures. Taking a vehicle door assembly as an example, through physical verification test, 3D measurement and other methods, the change of geometric dimension of the spraying process is tracked and the baking deformation law is studied. Then, the reasons of baking deformation are analyzed from the design structure and manufacturing process of door such as door inner plate, door guide rail, hinge nut plate and so on. In the early design stage, it is proposed to adopt the welding processes such as door inner plate welding, unilateral spot welding after door assembly edging, and separating spot welding between door hinge reinforcing plate and guide rail. In the stage of vehicle industrialization commissioning, it is proposed to correct the door welding fixture and adjust the hinge nut plate to compensate the baking deformation. By the real vehicle verification, this research result improves the appearance gap flush, which is of great significance to improve the perceived quality level of the whole vehicle and reduce customer complaints. At the same time, it also provides a reference for the improvement of baking deformation of tailgate, hood and other opening and closing parts.

Key words: Baking deformation; Front door assembly; Appearance gap flush; Improvement strategies