Effects of rolling parameters of snake hot rolling onstrain distribution of aluminum alloy 7075
(1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory for High Performance Complex Manufacturing,
Central South University, Changsha 410083, China)
2. State Key Laboratory for High Performance Complex Manufacturing,
Central South University, Changsha 410083, China)
Abstract: The realization way of snake rolling was introduced. Flow velocity, strain and stress distribution of 7075 aluminum alloy plate during snake rolling and symmetrical rolling were analyzed in Deform 3D. Effects of velocity ratio, offset distance between two rolls and pass reduction on the distribution of equivalent strain and shear strain were analyzed. The results show that flow velocity and equivalent strain on the lower layer of the plate are larger than those of the upper layer because of the larger velocity of the lower roll and the gap is increased with the increase of velocity ratio and pass reduction. The shear strain of rolling direction in the center point is almost zero during symmetrical rolling, while it is much larger during snake rolling because of the existence of rub zone. The shear strain is increased with the increase of velocity ratio, offset distance and pass reduction. This additional shear strain is beneficial to improve the inhomogeneous strain distribution.
Key words: finite simulation; 7075 aluminum alloy; snake rolling; shear strain; velocity ratio; offset distance; pass reduction