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中文摘要：
内高压成形的弯曲轴线多边形空心变截面结构件能够满足减重、节约空间以及提高强度和刚度的要求,使其成为汽车制造业以及航空航天领域的理想结构件。但弯曲轴线多边形截面构件内高压成形的不均匀变形问题是影响开裂及壁厚分布不均匀的一个重要原因。本文以轿车底盘前梁为例,采用实验方法研究了弯曲轴线多边形截面构件内高压成形的不均匀变形问题,分析了各种开裂缺陷产生的原因,给出圆角大小和成形压力之间的关系及成形件的壁厚分布。研究结果表明,弯曲工序引起的壁厚减薄和增厚导致的坯料不均匀以及复杂截面的周向变形不均匀,是导致内高压开裂及壁厚分布不均匀的主要原因,通过合理的预成形形状可以有效控制内高压成形的变形均匀性,成形出壁厚分布均匀的合格零件。
英文摘要：
Curved hollow polygonal structural component has become an ideal structure used in automotive, aircraft and aerospace areas because it can meet the requirement of weight reduction, saving space, and improving strength and stiffness. The main problem of chassis front frame was taken as an example and the inhomogeneous deformation of the frame was investigated by experiment. The causes of the crack defects were analyzed. The relationship between the round radius and pressure and the thickness distribution of the hydroformed part was given. The results show that the main causes of the crack defect and the non-uniform thickness distribution are the non-uniform thickness of the bent tube due to the thinning and thickening of the bending process and the inhomogeneous circumferential deformation of the complex sections. The deformation and the thickness distribution can be controlled through preforming shape and qualified part can be successfully manufactured.
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