汽车用多孔薄壁铝型材横向焊缝研究

Research on transverse welds of porous thin-wall aluminum profile for automobile

以某汽车电池托盘用铝合金型材为研究对象,基于HyperXtrude有限元仿真软件,对挤压过程中的金属流动情况进行了稳态数值模拟,得到良好的型材后,对连续挤压过程中新旧坯料的流动情况进行了瞬态分析,并预测了型材横向焊缝延伸长度,分析了挤压工艺参数和模具结构对横向焊缝的影响。结果表明,挤压速度从1 mm·s^(-1)提升到6 mm·s^(-1)时,型材横向焊缝延伸长度降低约24%;坯料加热温度对横向焊缝延伸长度几乎无影响;挤压比越小,型材横向焊缝延伸长度越短。下模焊合室圆角半径从1 mm提升至9 mm时,横向焊缝延伸长度降低了约21.9%。焊合室入口角度从0°提升至40°时,横向焊缝延伸长度减小了约46.1%。通过研究型材横向焊缝的形成过程,可以提升材料利用率,为实际生产提供指导。

Taking the aluminum alloy profile for an automobile battery tray as the research object,based on HyperXtrude finite element simulation software,the steady-state numerical simulation of metal flow during the extrusion process was carried out.After obtaining the good profile,the transient analysis on the flow of new and old billets during the continuous extrusion process was carried out,the transverse weld extension length of the profile was predicted,and the influence of extrusion process parameters and die structure on the transverse weld was analyzed.The results show that when the extrusion speed increases from 1 mm·s^(-1) to 6 mm·s^(-1),the transverse weld extension length of the profile is reduced by about 24%.The billet heating temperature has almost no effect on the transverse weld extension length.The smaller the extrusion ratio is,the shorter the transverse weld extension length of the profile is.When the fillet radius of the lower die welding chamber increases from 1 mm to 9 mm,the transverse weld extension length is reduced by about 21.9%.When the entrance angle of welding chamber increases from 0°to 40°,the transverse weld extension length is reduced by about 46.1%.By studying the formation process of transverse weld of the profile,the utilization rate of the material can be improved,and the guidance for the actual production can be provided.