汽车前副车架内高压成形工艺研究  

Research on Hydroforming for Automobile Front Sub-frame

作　　者：刘晓晶[1] 杨然 冯章超 王哲[1] LIU Xiao-jing;YANG Ran;FENG Zhang-chao;WANG Zhe(School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China;Liuzhou Wuling Automobile Industry Co.,Ltd.,Liuzhou 545007,China)

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040 [2]柳州五菱汽车工业有限公司,广西柳州545007

出　　处：《哈尔滨理工大学学报》2018年第2期129-133,共5页Journal of Harbin University of Science and Technology

基　　金：黑龙江省自然科学基金(E201102);哈尔滨市人才基金(2017RAXXJ008)

摘　　要：针对空间轴线薄壁零件存在的起皱、过度减薄和破裂等质量缺陷,以某汽车的前副车架为研究对象,采用数值模拟和成形试验相结合的方法,对副车架的内高压成形过程进行了研究。研究了弯曲过程中弯曲参数对弯曲成形减薄的影响,分析了轴向进给量、成形压力和加载路径对内高压成形质量的影响。基于有限元模拟得出的最佳参数,进行了弯曲、预成形和内高压成形实验,测量了弯曲圆角外侧和截面变化最大处的壁厚分布,并与模拟结果进行了比较。结果表明,弯曲成形时弯曲外侧容易出现过度减薄和破裂,可以通过优化弯曲参数改善。模拟结果和实验结果基本吻合,两者在典型截面处的壁厚分布整体变化趋势一致且两者壁厚最大差值为6%,表明该优化方案是可行的,可有效指导副车架的生产实践。Winkles,ruptures and excessive thinning are the forming defects for curved hollow components.Taking a car front sub-frame as the research object,the hydroforming of sub-frame was studied by combing numerical simulation and forming experiment.The effect of bending parameters on the thinning during the bending process was studied.The influences of main process parameters on the forming quality were considered,such as the internal hydraulic pressure,the axial feeding and the loading path.Experiments of bending,preforming and hydroforming were carried out based on the optimum parameter of the simulation.The thickness distribution of typical section was measured and compared with the simulation result.It shows that the lateral of corner easily appears fracture and excessive thinning,and these forming defects could be avoided through optimizing the bending process parameters.The numerical simulation results have good conformity to experimental ones in the wall thickness distributions,their overall tendency of thickness distributions tend to be consistent in typical section,and the maximum difference of thickness between simulation and experiment results is 6%,which indicates that the proposed optimization method is feasible and can provide an effective guidance for the hydroforming of subframe.

关 键 词：前副车架 弯曲预成形 内高压成形 数值模拟 

分 类 号：TG394[金属学及工艺—金属压力加工]