Springback characteristics in U-channel forming of tailor rolled blank  

作　　者：Huawei ZHANG Lizhong LIU Ping HU Xianghua LIU 

机构地区：[1]School of Automotive Engineering, Faculty of Vehicle Engineering and Mechanics, State Key Labora- tory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China [2]Research Institute of Science and Technology, Northeastern University, Shenyang 110819, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2012年第3期207-213,共7页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.10932003,50974039and50872126);the National Basic Research Program of China(No.2010CB832700);the Fundamental Research Funds for the Central Universities(893324,DUT11ZD202)

摘　　要：Residual stress developed during the rolling process of tailor rolled blank （TRB） can affect the springback of finished parts considerably. Springback characteristics of unannealed and annealed TRBs were investigated by means of numerical simulation and experiments taking U-Channel as an example. TRBs were annealed by the annealing process （700 ℃, holding time 10 h）, then stamping and springback processes of unannealed and annealed TRBs were simulated, and corresponding experiments were also carried out. Effects of the transition zone length, the blank thickness, the friction coefficient and the die clearance on the springback of TRB were analyzed. The results demonstrate that the springback of TRB annealed at 700 ~C for 10 h re- duces significantly. For unannealed and annealed U-Channels, the springback of TRB U-Channel is in direct proportion to the die clearance and is in inverse proportion to the transition zone length, the blank thickness and the friction coefficient. Spring- backs of the thinner monolithic （uniform thickness） blank, the thinner side of TRB, the thicker side of TRB and the thicker monolithic blank are sorted in descending order.Residual stress developed during the rolling process of tailor rolled blank （TRB） can affect the springback of finished parts considerably. Springback characteristics of unannealed and annealed TRBs were investigated by means of numerical simulation and experiments taking U-Channel as an example. TRBs were annealed by the annealing process （700 ℃, holding time 10 h）, then stamping and springback processes of unannealed and annealed TRBs were simulated, and corresponding experiments were also carried out. Effects of the transition zone length, the blank thickness, the friction coefficient and the die clearance on the springback of TRB were analyzed. The results demonstrate that the springback of TRB annealed at 700 ~C for 10 h re- duces significantly. For unannealed and annealed U-Channels, the springback of TRB U-Channel is in direct proportion to the die clearance and is in inverse proportion to the transition zone length, the blank thickness and the friction coefficient. Spring- backs of the thinner monolithic （uniform thickness） blank, the thinner side of TRB, the thicker side of TRB and the thicker monolithic blank are sorted in descending order.

关 键 词：Tailor rolled blank SPRINGBACK ANNEALING 

分 类 号：TG146.21[一般工业技术—材料科学与工程] U416.217[金属学及工艺—金属材料]