摘要
采用电磁感应辅助的热拉伸实验、红外热像仪和数字图像相关技术等手段模拟了热冲压成形AA7075汽车车身零件的制造流程,研究了变形温度、板料变形量、自然时效时间和烘烤时间对零件力学性能的影响。结果表明,提高变形温度可以提升热冲压成形AA7075的抗拉强度和屈服强度。当变形温度高于400℃时,变形温度对零件强度的提升较小;在成形过程中,变形量越大,热冲压成形AA7075的抗拉强度和屈服强度越低;自然时效20 d以内,热冲压成形AA7075的抗拉强度和屈服强度基本不变,自然时效时间大于20 d,抗拉强度和屈服强度均有一定下降;烘烤时间的波动对热冲压成形AA7075的抗拉强度和屈服强度无明显影响。
The manufacturing process of hot-stamped AA7075 parts of automotive body was simulated by means of electromagnetic induction-assisted high-temperature tensile tests,infrared camera and digital image correlation technology,and the effects of deformation temperature,sheet deformation,natural aging time and paint baking time on the mechanical property of parts were studied. The results show that the tensile strength and yield strength of hot-stamped AA7075 can be improved by increasing the deformation temperature. When the deformation temperature is higher than 400 ℃,the improvement of strength caused by deformation temperature is small;during the forming process,the larger the deformation is,the lower the tensile strength and yield strength of the hot-formed AA7075 is;within 20 d of natural aging,the tensile strength and yield strength of hot-formed AA7075 are basically unchanged,and after 20 d of natural aging,both the tensile strength and yield strength are decreased;the fluctuation of paint baking time has no significant effect on the tensile strength and yield strength of hot-stamped AA7075.
作者
闵峻英
卢嘉昕
魏一凡
MIN Jun-ying;LU Jia-xin;WEI Yi-fan(School of Mechanical Engineering,Tongji University,Shanghai 201804,China;Pan Asia Technical Automotive Center Co.,Ltd.,Shanghai 202106,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第6期96-103,共8页
Journal of Plasticity Engineering
关键词
AA7075
变形温度
变形量
自然时效
烘烤
AA7075
deformation temperature
deformation amount
natural aging
paint baking
