Analysis Of Invalidation Of Mail Roll With Modern Strength Theory

During rolling, mill roll consumption is mainly mill roll breaking off and mill roll flaking besides normal mail roll wear. Abound accident indicates to make a study of mill roll invalidation problem is awaiting further development. In the dissertation, application of SUPER CAD software is calculation of thermal field and stress field of four high mill of plate limited company of Qinhuangdao. On the basis of that, Our synthesis application of cumulative damage theory, tolerable limit damage analysis theory and fatigue reliability analysis theory roughly estimates limited length of lift of mill roll, crack expand length of lift of mill roll and reliability of mill roll First, we calculate average unit stress and roll force by using roiling regulation of plate limited company of Qinhuangdao, equivalent distribution roll force to nodal point, subsequently, count thermal field of deformation zone. After inputting equivalent nodal point force and node temperature~ we have regulation of distribution of rolling stress and thermal stress by using SUPER CAD software. Having made a allowance for without crack and from potty crack to critical crack, we use cumulative damage theory and tolerable limit damage analysis theory roughly to estimate length of lift of mill roll, later, we have roughly estimated degree of reliability of mill roll by being fatigue reliability analysis We apply cumulative damage theory, tolerable limit damage analysis theory and fatigue reliability analysis in order to preface length of lift of mill roll perfectly and roughly estimate security of mill roll . Because of using three methods to estimate length of lift and reliability of mill roll, its exactness is higher than anyone of them Roll breakage is in the majority of consumption of mill roll. The solution of roll breakage perfectly is very great theoretical and virtual significance, particular in economic benefit. In a word, invalidation analysis of mail roll is urgent~ aim at this, we have taken study in theoretical system.