压边力对双焊缝差厚拼焊板拉延成形焊缝移动的影响
The Effect on Weld Seam Movement caused by Blank Holder Force of TWBs with Different Thicknesses that have two Weld Seams During Drawing Process
夏江梅1，王立敏2，陆演2，李 崇3
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作者单位：1、重庆工业职业技术学院，重庆401120；2、北京汽车股份有限公司工程研究院，北京100021；3、重庆大学 材料科学与工程学院，重庆400044
中文关键字：拼焊板；拉延；焊缝移动；压边力
英文关键字：TWB; drawing; weld seam movement; blank holder force
中文摘要：拼焊板在拉延成形时焊缝移动受多方面因素的影响，本文模拟分析了不同压边力值和分段压边力对具有两道焊缝的差厚激光拼焊板汽车后纵梁在拉延成形过程中焊缝移动的影响。通过分析在不同压边力下两条焊缝的移动量得出了焊缝最大移动量随压边力的增大而增大的规律。为了减小两条焊缝的移动量，成形过程中在保证总压边力不变的情况下对差厚拼焊板的不同板厚部分设置不同的压边力。通过模拟分析得出了焊缝最大移动量随着薄侧压边力的增大和厚侧压边力的减小而减小。合理的增大薄侧板料压边力，减小厚侧板料压边力可以减小焊缝移动量，提高成形质量。
英文摘要：The weld seam movement of TWB is influenced by some factors during drawing process. In this paper, the effect on weld seam movement caused by different blank holder force and segmented blank holder force of back rail of an automobile maded by TWBs with different thicknesses that have two weld seams during drawing process is simulated and analysed.The results show that the max weld seam movement increases with the blank holder force through the analysis. In order to reduce the weld seam movement the blank holder is segmented into three parts according to the blanks with different thicknesses, and the different blank holder forces are applied on the different blank holders on condition that the total blank holder force is invariable. And in this situation the results show that the max weld seam movement decreases as the blank holder force of thinner side increases and the thicker side decreases. Increasing the blank holder force of thinner side and decreasing the blank holder force of thicker side reasonable can decrease the weld seam movement and improve the forming quality.