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本文以数值模拟为手段 ,利用大型商业化有限元软件Pam Stamp ,针对铝型材框架式车身生产中的关键技术———铝型材高精度弯曲成形进行了深入系统的研究 ,模拟了大尺寸封闭截面铝型材AA60 82 (T1状态 )在不同弯曲半径下的拉弯成形过程。研究结果表明 ,铝型材拉弯成形极限主要受脱模、起皱及壁厚减薄的限制 ,而成形精度主要受回弹和截面变形的影响。截面形状、弯曲半径和拉伸量是铝型材拉弯工艺中的 3个重要参数 ,确定正确的拉伸量是拉弯工艺成败的关键。文章通过对计算结果的分析 ,提出了上限拉伸量和下限拉伸量及相应的确定方法 ,并给出了铝型材拉弯工艺中拉伸量的取值原则
In this paper, numerical simulation is used as a means to make a deep and systematic study on the high-precision bending forming of aluminum profile with the help of Pam Stamp, a large-scale commercial finite element software. The large-size closed section Aluminum profile AA60 82 (T1 condition) Bending forming at different bending radii. The results show that the bending forming limit of aluminum profile is mainly limited by mold release, wrinkling and wall thickness reduction, while the forming accuracy is mainly affected by springback and cross-section deformation. Section shape, bending radius and drawing amount are the three important parameters in the aluminum bending process. Determining the correct drawing amount is the key to the success or failure of the bending process. Based on the analysis of the calculation results, the paper puts forward the upper stretch and the lower stretch as well as the corresponding determination methods, and gives the principle of the value of stretch in aluminum profile bending and bending process