The materials,structures and processes of welded parts were analyzed to determine the key influencing processes.The multiple process simulation of original stamping process plan was carried out,the simulation results were analyzed,and the reason of cracking de-fects was identified.The load transfer between processes was improved by increasing the preforming design of welded parts and changing the shape of billet,the response surface model was established with the maximum thinning rate and the maximum springback of the welded parts as optimization objectives,and the stamping speed,friction factor,blank holding force and mold clearance as design variables.Combining second-order response surface method and Design Expert,the central composite design experimental method was used to opti-mize the process parameters of the bracket welded parts.The determined optimal parameters are stamping speed of 1263 mm,friction fac-tor of 0.15,blank holding force of 598 kN,mold clearance of 4.55 mm.The results of trial production show that the cracking and spring-back problems can be solved by preforming scheme and optimizing process parameters.
关键词
支架焊合件/冲压成形/BR440高扩孔钢/预成形/星点设计/响应面法
Key words
bracket welded part/stamping forming/BR440 high expansion steel/preforming/star point design/response surface meth-od
维普
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