The influence factors of mill roll gap shape

Strip transverse thickness difference ( I. e. , the change of cross section shape) And strip shape change is caused by the change of roll gap shape. Factors influencing the roll gap shape are: 1) The elastic bending deformation of roll. It makes the central roll gap size is greater than the size of edge, strip crown edge, strip edge thinning. The greater the elastic bending deformation of the rolling pressure, the greater the roll; The roll diameter, the greater the rigidity, the better, the roll of elastic bending deformation is smaller. 2) The thermal expansion of the roll. Rolling deformation of rolled piece when the heat generated by the friction, rolled piece and roll and heat can make roll is heated. Lengzha lubricants and roll cooling. Because along the length of the roll on the heating and cooling, under the influence of various factors, roll the middle than at the ends of the thermal expansion, so that the roll thermal crown, affect the roll gap shape. 3) The roll wear. Between work roll and steel strip, the friction between work roll and backup roll roll wear. Factors affecting roll wear is various, such as: roll and strip material, roll surface hardness and roughness, rolling pressure and rolling speed, the size of the forward slip and slide after between work roll and supporting roller sliding velocity and so on will affect the speed of roll wear. In addition, the direction along the length of the roll roll wear is uneven, these will affect the roll gap shape. 4) Roll the elastic flattening. Due to the effect of rolling pressure, rolling steel strip and work roll between, between work roll and backup roll will produce elastic flattening. Effect of roll gap shape not roll elastic flattening numerical, but flattened along the length of the roll direction of different sizes. Because the contact length between the work roll and backup roll is greater than the strip and work roll contact length, thus the pressure at every point on the contact length is not the same, which makes the elastic flattening between roll and roll values along the length of the roll direction is uneven. Uneven between work roll and backup roll flattening caused the change of roll gap shape. 5) Roll the original roller type ( Convex, concave, or cylindrical) 。 Roll the original roll shape is different, can be artificially make the roll gap shape is different. We use roll in the production of the original type roll this factor to compensate for the above factors on the impact of roll gap.