Effects of Preform on Thickness Distribution of Hydroformed Y-Shaped Tube
Hydroforming processes of a Y-shaped stainless steel tube with d/t (ratio of diameter to thickness) of 183 is presented. FEM simulations were carried out for analyzing the stress states and thickness distribution in the workpieces during hydroforming of the Y-shaped tube. A two-step process with preform procedure is presented to improve the stress states in the protrusion and to avoid the severe thinning at the top of the protrusion. Through the two-step hydroforming, the wrinkling and cracking defects were all avoided and sound components were produced.
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
G. Liu et al., "Effects of Preform on Thickness Distribution of Hydroformed Y-Shaped Tube", Advanced Materials Research, Vols. 189-193, pp. 2796-2800, 2011