6016铝合金热冲压数值模拟研究  

Research on numerical simulation of hot stamping for 6016 aluminum alloy

作　　者：张志强 张晓凯 何东野 Zhang Zhiqiang;Zhang Xiaokai;He Dongye(Key Laboratory of Automotive Materials,Ministry of Education,College of Materials Science and Engineering,Jilin University,Changehun 130022,China;Roll Forging Institute,Jilin University,Changehun 130022,China)

机构地区：[1]吉林大学材料科学与工程学院汽车材料教育部重点实验室,吉林长春130022 [2]吉林大学辊锻工艺研究所,吉林长春130022

出　　处：《锻压技术》2018年第12期16-19,共4页Forging & Stamping Technology

基　　金：吉林省教育厅“十三五”科学研究规划项目(JJKH20180128KJ)

摘　　要：为分析成形过程中板料的等效应力、温度及厚度变化规律,通过6016铝合金U形件热冲压实验,建立热-力耦合的有限元分析模型。研究结果表明,板料外侧的法兰区域受力较小,随着变形程度的增加,凸模圆角处受力逐渐增加,最大达到54MPa,在凸模圆角区域板料具有最大的应力和减薄量,是产生破裂的危险区域。温度分析结果表明,成形过程中板料温度下降较快,当成形结束后板料温度由500℃下降到最低467℃,最低温度位置在零件法兰外侧。模拟与实验结果的厚度分布规律基本吻合,在零件的底面及法兰成形后厚度基本不变,厚度的减薄主要发生在凸模与凹模圆角及侧壁区域,验证了所建立的有限元模型是有效的。In order to analyze the variation laws of equivalent stress,temperature and thickness of sheet metal during forming process,a thermal-mechanical coupled finite element analysis model was established by hot stamping experiment of 6016 aluminum alloy U-shaped parts.The results show that the stress on the flange area outside the blank is always small.With the increase of deformation,the stress in the punch fillet region increases gradually up to maximum 54MPa,and the maximum stress and thickness reduction are located at the punch fillet region,which is the dangerous area of fracture.The results of temperature analysis show that the temperature of sheet metal decreases rapidly during forming process,and the lowest temperature of sheet metal is located outside the flange area when the temperature of sheet metal drops from 500℃ to 467℃ after forming.Then,the thickness distribution calculated by simulation is consistent with the experimental results,and the thicknesses of the bottom surface and the llange basically remain unchanged.Thus,thinning mainly lies in the punch,die fillet region and sidewall region,and the established thermo-mechanical coupling finite element model is verified to be effective for aluminum alloy hot stamping simulation.

关 键 词：6016铝合金 热冲压 热-力耦合 有限元分析 等效应力 厚度分布 

分 类 号：TG156.3[金属学及工艺—热处理]