预应力组合轧辊由辊套与辊轴装配而成；预先施加于辊套的预应力用来平衡在轧制 过程中出现的水平力．在轧辊装配及在抚套上加工Ｖ形槽的过程中，不可避免地引起辊套 中预应力的减小，从而削弱预应力的平衡作用；造成轧辊沿 Ｖ形槽底部环裂的现象．通过 电测实验搞清了轧辊在轧制过程中的卸力规律，为改进设计提供了理论依据． The prestressing combination roll is made up of the roll cover and the roll shaft; the prestress applied to the roll cover is used to balance the horizontal force appearing in the rolling process. During the assembly of the roll and the V-shaped groove on the pre-roll, the reduction of the prestress in the sleeve is inevitably caused, so that the balance effect of the prestressing is weakened; and the ring is split along the bottom of the V-shaped groove. Through the electrical test, the law of unloading force of the roll during the rolling process is clarified, which provides a theoretical basis for improving the design.