闭截面型材的拉弯成形性

拉弯是型材的基本成形方法.截面畸变是型材拉弯成形中的常见缺陷,并对型材的回弹和变薄有交叉影响,型材拉弯成形性的分析评估远比板材成形复杂.提出了型材拉弯成形性的概念,建立了矩形截面型材拉弯成形性分析模型,基于有限元数值模拟研究了截面结构、相对高度和壁厚分布等几何参数对拉弯成形性的影响规律,从提高拉弯成形性出发提出了型材截面优化设计的原则. 

Stretch-bending formability of profile

Stretch-wrap bending is the essential forming processing for profile.Cross section distortion is the common defect during the stretch-wrap bending of profile,and it brings cross-effect with thinning of thickness and springback.The stretch-wrap bending formability for profile is much more difficult to analyze and to evaluate than that for sheet forming.The concept of stretch-wrap bending formability for profile was presented and an analytic model for profile with rectangular section was established.The effect of the geometric parameters such as section configuration,relative height and wall-thickness distribution of profile on stretch-wrap bending formability was studied based on finit element method(FEM) numerical simulation.The principle for optimization design of cross section was proposed in order to improve the stretch-wrap bending formability of profile.