Optimization of roll shape and control of edge wave plate shape defect by galvanized finishing machine
In order to solve the problem that the ability of galvanized finishing machine to eliminate the edge wave of ultra high strength steel was limited,the finite element model of finishing rolling process was established,and the reasons for the insufficient ability of finishing machine to control ultra high strength steel shape were analyzed.On this basis,the roll shape of the work roll and support roll was optimized,and the characteristics of shape control for finishing machine under different roll configurations were analyzed.The research shows that after roll shape optimi-zation,the lateral stiffness of bearing roll gap is increased by 9％-20％,the efficiency of bending roll control is in-creased by 17％.Under the condition of ensuring good exit shape,the bending force is reduced by about 40％,the unevenness of the contact pressure between rolls is reduced by 31％at most,so as to realize the possibility of finish-ing ultra high strength steel with large rolling force.The influence of work roll diameter on the characteristics of shape control was analyzed.It is found that the rolling force required for finishing can be effectively reduced by re-ducing the work roll diameter,that is,using a small roll diameter work roll can roll higher strength and thinner ultra high strength steel.And it is also found that the smaller the work roll diameter,the larger the regulation domain of the bending roll control efficiency and the bearing roll gap crown,but the lateral stiffness of the bearing roll gap de-creases,and the unevenness of the contact pressure between rolls increases.Based on the above research results,the on-site application is carried out,which proves that the optimized roll shape can effectively control the edge wave shape defects of ultra high strength steel,and provides a theoretical basis for the shape control of ultra high strength steel finishing process.
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