工艺参数对aa5754铝合金板材温成形回弹影响研究车辆工程专业论文.docxVIP

工艺参数对AA5754铝合金板材温成形回弹影响研究Research 工艺参数对AA5754铝合金板材温成形回弹影响研究 Research on EfI．ect of Process Parameters on Sp^ngback of Wann Fo枷ng for AA5754 Aluminum Alloy Sheet Abstract Under the restraints of resources and enviroIlIllent，lightweight of automobile becomes the deVelopment trend of current auto industry，and lightweight of vehicle body is the key technology of light、Ⅳei曲t of automobile．Aluminum alloy becomes the jdeal mate—a1 of li曲铆eight of Vehicle body for its predominaIlces such as small mass，adequate reserves， sinlple pr印aration，high recoVe巧rate and so on．HoweVer，the plastjc defo加ation capacity of aluminuJn alloy is poor at room temperature，aJld there is serious springback problem in de印drawing，af．fecting the geomet叫and dimension precision of pans．In order to improve the springback problem，the wann foming technology of aluminum a儿oy sheet emerges as the times require． FirstIy，the theoretical analysis method is applied to inVestigate the state of stress and strain of blam(in de印drawing process．Meanwhile，the numerical simuJation of split-ring expe打ment for cylindricaJ wa彻drawing cups is perf．0n11ed，and the simulation result is compared with experiment result． Secondly， tlle springback propeny of aluminum aIloy cylindrical drawing cups with dif．ferent process parameters is inVestigated by onhogonal test design method in conjunction with numerical simulation method during wa加 fo肌ing process，the optimization scheme minimizing springback is detemined，which is Validated by numerical simulation method． Finally， based on regression onhogonal test design， a regression model of relationship between springback and process parameters，including initial fonning temperature of blalll(，确ction coemcient，blalll(holder fbrce，die radius and die clearance，is established for warnl fo丌ning of aluminum alloy，by the numerical simulation of split-^ng expe打ment for cy“ndricaJ warnl drawing cups．The regression model is印plied to predict the sp—ngback，whose result is compared with the ones of