蛇形热轧中轧制参数对7075铝合金厚板变形分布的影响

介绍了蛇形轧制的实现方式。运用数值模拟方法，在Deform 3D上分析单道次轧制过程中蛇形轧制和对称轧制7075铝合金厚板的流动速度及应力应变分布情况，分析异速比、上下轧辊错位量和压下量对蛇形轧制变形区内轧板等效应变和剪切应变的影响规律。结果表明：蛇形轧制中，由于下辊速度快，轧板下层金属流动比上层快，蛇形轧制中轧板下层等效变形大于上层，且随着异速比的增大，上下层金属变形差距增大；对称轧制中厚板心部的剪切应变几乎为0，蛇形轧制中由于有“搓轧区”的存在，厚板心部的剪切应变远大于对称轧制的，且随着异速比的增加和错位量的增加，轧板心部的剪切变形增大。这种附加的剪切变形有利于使变形向厚板心部渗透，从而改善厚板高向变形的不均匀性。

Effects of rolling parameters of snake hot rolling on strain distribution of aluminum alloy 7075

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 roiling 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 in_homogeneous strain distribution.