Aiming at the flexible 3D stretch bending process (FSB) with multi-point die, the ABAQUS finite element software is used to simulate the bending process of the aluminum profile. In the FSB process, the deformation difference between the contact zone and non-contact zone of profile and roller dies is studied. By changing the pre-stretching amount of profile in the forming process, the finite element analysis of bending process is carried out. By measuring the height and thickness of the profile web, the influence of pre-stretching amount on the contact zone and non-contact zone is obtained. The results show that during the bending process, the points on profile deviate from the original position in height direction, which increases the web height in the non-contact zone and decrease it in the contact zone. And the points on the profile deviate from the theoretical bending position in the thickness direction of web, which leads to the web thinning in the non-contact zone and contact zone, but the thinning rules are different. When the pre-stretching amount increases, the profile web height does not change significantly in the contact zone and non-contact zone, but the thickness of profile web becomes thinner in each contact zone away from the clamp, while the thickness in the non-contact zone has no distinct change, and the thickness deformation of the web near the clamp is not obvious.

针对具有多点模具的柔性3D拉伸弯曲工艺（FSB），ABAQUS有限元软件用于模拟铝型材的弯曲工艺。在FSB过程中，研究了型材和辊模的接触区和非接触区之间的变形差。通过在成形过程中改变型材的预拉伸量，对弯曲过程进行了有限元分析。通过测量轮廓网的高度和厚度，获得了预拉伸量对接触区和非接触区的影响。结果表明，在弯曲过程中，轮廓上的点在高度方向上偏离原始位置，这会增加非接触区域中的腹板高度，而在接触区域中则减小腹板高度。并且轮廓上的点在幅材的厚度方向上偏离理论弯曲位置，这导致幅材在非接触区和接触区变薄，但是变薄规则不同。当预拉伸量增加时，异型材的高度在接触区和非接触区不会明显变化，但是异型材的厚度在远离夹具的每个接触区变薄，而在非接触区的厚度接触区没有明显变化，夹具附近的纤维网厚度变形也不明显。