What are the factors that affect the roll gap shape of roll manufacturers?

Recently, Xiaobian heard that you found that the roll gap shape was formed. Today, let the roll manufacturer Wuxi Taihu roll editor give you an explanation of the factors affecting the roll gap shape.

The roll manufacturer said that the transverse thickness difference (change of section shape) and shape change of strip steel are caused by the change of roll gap shape. The factors affecting the roll gap shape are:

(1) Elastic bending deformation of roll. The dimension of the strip is larger than that of the middle part, which will reduce the convexity of the strip edge. The greater the rolling force, the greater the elastic bending deformation of the roll; The larger the roll diameter, the better the rigidity, and the smaller the elastic bending deformation of the roll.

(2) Thermal expansion of rolls. During rolling, the heat generated by the deformation of the rolled piece and the heat generated by the conflict between the rolled piece and the roll will heat the roll. The cooling lubricant will cool the roll. The heating and cooling conditions along the length of the roll body are inconsistent. Under the influence of various factors, the thermal expansion in the middle of the roll is greater than that at both ends, resulting in thermal crown of the roll and affecting the shape of roll gap.

(3) Roll wear. The conflict between the work roll and the strip steel, and between the work roll and the backup roll will wear the roll. For example, the wear between the roll speed and the roll material, as well as the wear between the roll speed and the roll surface, will also affect the rolling speed and the roll roughness. In addition, the roll wear along the length of the roll body is uneven, which will affect the shape of the roll gap.

(4) Elastic flattening of roll. During rolling, due to the action of rolling force, elastic flattening will occur between strip steel and work roll, and between work roll and support roll. The influence of roll gap shape is not the value of roll elastic flattening, but the different size of flattening value along the length direction of roll body. For the work roll, if the rolling force is evenly distributed along the width of the strip, the elastic flattening of the work roll is also evenly distributed. Because the touch length between the work roll and the support roll is greater than that between the strip steel and the work roll, the pressure at each point on the touch length is different, which makes the elastic flattening value between the roll and the roll uneven along the length direction of the roll body. The uneven flattening between the work roll and the support roll causes the change of roll gap shape.

(5) The original roll profile of the roll (convex, concave or cylindrical). If the original roll shape of the roll is different, the roll gap shape can be artificially different. In production, we use the original roll shape of the roll to compensate for the influence of the above factors on the formation of roll gap.

OK, the above is a brief introduction of the factors affecting the roll gap shape by the roll manufacturer. If you want to know more about roll products and roll manufacturers, please pay attention to the roll manufacturer Wuxi Taihu roll Xiaobian.