双阶梯无过渡锥角铝合金管件内高压成形研究

采用数值模拟与工艺实验的方法,研究了双阶梯无过渡锥角管件的内高压成形过程。在总轴向进给量与进给压力均为定值条件下,研究了管端左右进给量分配比对成形结果的影响,分析了成形不同阶段管坯的形状变化与壁厚分布,以及管坯不同部位应变在成形极限图上的变化轨迹。结果表明,双阶梯管件左侧与右侧轴向进给量存在合理分配比;无过渡锥角管件易出现折叠现象;双阶梯管件可以通过起皱成形,但皱峰与皱谷的应变路径不同,壁厚变化也不同。

Hydroforming of aluminum tubular parts with different diameter

Hydroforming of aluminum tubular unsymmetrical parts without cone-shaped transition was carried out on by means of FE simulation and experiment.The influence of different left and right feeding length was discussed with the constant total feeding length and feeding pressure.The shape change of the tube and thickness distribution was analyzed in different period of forming.The strain path on the Forming Limit Diagram(FLD) of different location was analyzed.For part with double diameter,there is the proper ratio of left to right feeding length.Folding occurs very easily for parts without cone-shaped transition.Forming through useful wrinkle is available,but the strain path and thickness distribution of different location is different.