Assembly variation analysis of three dimensional compliant sheet metal parts under an over-located condition

作者：Yu Kui Gang^*; Yang Zhi Hong

来源：WSEAS Transactions on Systems, 2014, 13(1): 213-222.

• Assembly model
• Assembly problems
• Assembly variations
• Automotive body
• Measurement points
• Optimization design
• Sheet metal assemblies
• Sheet metal parts

An over-located condition is very common for most automotive compliant sheet metal assembly process. To accurately analyze the assembly variation can help make an optimization design of assembly process. The existed assembly variation modeling methods based rigid and compliant parts can not fully exactly and rapidly analyze the assembly variation. This paper proposes a new assembly variation modeling method of compliant sheet metal parts to solve these limitations. This proposed new assembly variation modeling method of compliant sheet metal parts combines the rigid and compliant characteristics of sheet metal parts. An assembly variation modeling method of a rigid part under a 3-2-1 locating layout is given using its spatial motion relationship when some fixture locating variation happens. Based on this method, a multi-divided rigid area assembly variation modeling method can be obtained according to part's bending deforming principle during the locating process. A simplified stiffness solving method for the welding spring-back is given, and an assembly variation modeling method for the welding area of parts is presented using the stiffness comparison of welding parts. Then the assembly variation of measurement points in welding area and out of welding area can be obtained according to the proposed method. A case of two compliant sheet metal parts is used to demonstrate and validate the proposed method. The results show that the proposed method can achieve a rapid and accurate assembly variation analysis through the comparison with the existed rigid and compliant sheet metal assembly variation modeling methods. The proposed assembly method can be used to predict the assembly quality of compliant sheet metal parts, and then an optimization design of the assembly process can be obtained. This provides good help for engineers to design and analyze the assembly problems of automotive body.

• 出版日期2014