Mechanical Analysis Of Work Roller's Surface Stress And Wear Failure On Cold Rolling

Roll is the important part of mill, which is contact directly with the steel plate and make it generate plastic deformation. In rolling, roll is easy to fail, The main modes of failure are wear, crack in the surface and flake. Wear and flake damage the original shape of rolls, which affect the plate shape and the plate crown directly, it is very hard to control the product quality, roller failure has greatly increased the consumption. it is very important for theory value and practical significance to study roller f failure, which can reduce the cost of the production, the consumption of the roller and improve quality of plate.Firstly, the paper analyzed the failure mechanism and reasons of cold roller, research the commonly rule of roller failure, and then analyzed the failure reasons deeply in the way of mechanics. At the same time, established the crack initiation life prediction mode of work roller.Secondary, considering elastic deformation of roller and elastic-plastic deformation of the plate, based on the finite element software MARC, set up a three-dimensional emulational model of the four-high rolling mill and HCW rolling mill. The model considered the rolls and plate as a system , has resolved the coupling problem of the plate deformation and the rollers deformation.Finally, calculated the stress field using finite element. Analyzed the effect of surface stress to wear and fatigue failure of work roller, then through compared the data calculated by finite element with calculated by analytic method, verified the accuracy of finite element model. Study the influencing rule of strip width, reduction ratio, bending force, work roll shift and both bending force and work roll shift to rolling pressure, the pressure between rollers and roller failure, and predicted the fatigue life of work roll in different rolling parameters, brough forward measures of reducing roller failure.