汽车用铝合金搅拌摩擦焊接薄片冷冲压工艺研究  

Study on Cold Stamping Process of Aluminum Alloy Friction Stir Welded Sheet for Automobile

作　　者：侯满哲 马宏 庞永俊 孙冰心 HOU Manzhe;MA Hong;PANG Yongjun;SUN Bingxin(College of Science, Hebei Institute of Architecture Civil Engineering, Zhangjiakou 075000, China;State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha 410082, China)

机构地区：[1]河北建筑工程学院理学院,河北张家口075000 [2]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082

出　　处：《热加工工艺》2018年第7期177-180,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(11232004);河北省科技厅科技计划项目(16211820);河北省高等教育教学改革项目(2017GJJG170);河北建筑工程学院校级科研基金项目(2016XJJQN06);河北建筑工程学院青年基金项目(2016XJJQN04)

摘　　要：通过仿真与试验研究了搅拌摩擦焊接AA1050铝合金薄板的冷冲压工艺。确定了旋转速度和焊接速度并制作满足所需力学性能的接头。通过单轴拉伸试验表征母材和焊接坯料的本构特性,并将分析试验结果得到的本构方程应用于模拟焊接坯料冷冲压过程。通过搅拌摩擦焊接坯料的冲压试验验证了仿真结果,并将板厚、主应变与次应变的预测结果和实际测量结果进行了对比。结果表明：搅拌摩擦焊接区域的应力值高于母材,搅拌摩擦焊接坯料的应变硬化系数低于母材的应变硬化系数。薄板的最大变薄量约等于初始厚度的24%。预测厚度和实际测量厚度间的最大厚度差异约为7%。The cold stamping process of AA1050 aluminum alloy friction stir welded sheet was studied by simulation and experiment. The rotation speed and welding speed were determined, and the joints satisfying the required mechanical properties were made. The uniaxial tensile test was used to characterize the constitutive characteristics of the base metal and the weld zone. The constitutive equations obtained by analyzing the test results were applied to simulate the cold stamping process of welded blanks. The simulation results were verified by stamping test of friction stir welded blanks. The prediction results of the plate thickness, the principal strain and the minor strain were compared with the actual measurement results. The results show that the stress value of the friction stir welding zone is higher than that of the base metal, and the strain hardening coefficient of the friction stir welded blank is lower than that of the base metal. The maximum thinning amount of the sheet is about 24% of initial thickness. The maximum thickness difference between predicted thickness and actual measured thickness is about 7%.

关 键 词：铝合金 搅拌摩擦焊 冷冲压 有限元法 

分 类 号：TG386[金属学及工艺—金属压力加工]