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高强度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。针对差厚拼焊板冲压成形时,制件局部容易出现破裂、起皱和回弹过大等问题,利用有限元分析软件Dynaform对B340LA高强拼焊板B柱内板成形过程进行模拟,研究了压边力、模具间隙对B柱拼焊板成形的影响规律,并通过实验进行验证。研究结果表明,随着压边力增大,制件减薄率增大,增厚率减小,焊缝移动增大,制件回弹量减小;随着模具间隙增大,减薄率和增厚率都减小,焊缝移动增大,回弹量增大。合理工艺参数为压边力1200 k N,即该压边力为理论计算值的1.03倍,模具单边间隙为板厚的1.1倍。
Tailored welding with high-strength body to reduce weight, energy saving and environmental protection, improve the safety performance of the body and so on. In order to deal with the problems such as rupture, wrinkling and springback when the thicker tailor welded plate is stamped, the forming process of B pillar inner plate of B340LA high tensile tailor welded plate is simulated by finite element analysis software Dynaform. The influence of blank holder force and mold clearance on the forming of B-Tailor welded plate, and the experiment is carried out to verify the influence law. The results show that as the blank holder force increases, the rate of thinning increases, the rate of thickening decreases, the weld movement increases, and the springback decreases. With the increase of die clearance, the thinning rate And the thickening rate are reduced, weld movement increases, the amount of rebound increases. Reasonable process parameters for the BHK 1200 kN, the blank holder force of 1.03 times the theoretical value of the mold unilateral clearance of 1.1 times the plate thickness.