基于高强度拼焊板的B柱内板工艺参数研究

Research of process parameters on B-pillar inner based on HSSTWB

高强度激光拼焊板具有减轻车身重量、节能环保、改善车身安全性能等优点。研究了工艺参数对差厚高强度激光拼焊板B340/590DP成形汽车B柱的影响规律,设定了冲压速度、压边力、模具间隙、摩擦系数4个工艺参数的正交试验方案,利用有限元软件Dynaform对B柱内板成形过程进行模拟,得到关于最小减薄率的最优参数。利用软件中回弹补偿模块进行拉延模具修正,利用优化的工艺参数,进行了工艺试验。试验结果与模拟结果一致,即制件成形良好,焊缝没有破裂,回弹量小于1mm,最小减薄率小于20%。采用有限元方法与工艺试验相结合的方法,减少了修模次数,得到了合格的零件。

High-intensity laser welded blanks have the advantage of reducing body weight, saving energy and protecting environment, improving body safety and so on. The effect of process parameters on forming B-pillar of car based on differential high strength steel tailor welded blank （HSSTWB）B340/590DP was researched. The orthogonal experiment scheme of four process parameters was set up, and the process patameters include punching speed, orthogonal program BHF, die clearance and friction coefficient. The forming process of B-pillar panel was simulated using the finite element software Dynaform, and the best parameters which effect minimum rate of thinning were obatained. The correction of drawing die was finished using the springback compensation module, and the process test was made using the optimized process parameters. The test results are consistent with the simulation results, the forming propety of parts is well, the welding line does not rupture, the springback value is less than 1mm and the minimum rate of thinning is less than 20%. When finite element method is integrated with process test, the number of repairing die reduces and qualified parts are obatained.