Method for determining roll shape curve of supporting roll of CVC rolling mill with parabolic chamfers

Abstract

The invention provides a method for determining a roll shape curve of a CVC rolling mill supporting roll with parabolic chamfers, and relates to the technical field of plate and strip rolling. The method comprises the steps: setting a roll shape curve equation of the CVC rolling mill supporting roll, and determining the preset sizes of chamfers of the operation side and the transmission side of the CVC rolling mill supporting roll according to the value range of the chamfer size of the end of the CVC rolling mill supporting roll; determining parabolic chamfer curve equations of the operation side and the transmission side of the CVC rolling mill supporting roll; and finally, combining the chamfer curve equation of the operation side and the transmission side of the back-up roll of the rolling mill with the roll shape curve equation of the back-up roll of the CVC rolling mill to obtain a target roll shape curve of the back-up roll. According to the method, the situation that the contactpressure distribution between the CVC rollers is not uniform is improved, so when the supporting roller with the parabola-shaped chamfer is matched with a working roller of a rolling mill for work, harmful contact is reduced, the phenomenon of edge stress concentration of the supporting roller is improved, uniform abrasion of the rollers is achieved, and the service life of the rollers is remarkably prolonged.

Description

technical field [0001] The invention relates to the technical field of strip rolling, in particular to a method for determining the roll shape curve of a CVC mill backup roll with parabolic chamfers. Background technique [0002] Plate and strip is one of the important products of the iron and steel industry, and is an important raw material for industries such as automobiles, home appliances, shipbuilding, bridges, boilers, and aerospace. With the development of my country's industry, the production of plate and strip has changed from simply pursuing output to focusing on product quality, reducing costs, energy consumption and raw materials. Improving product quality is an important means to achieve this goal. In the production of plate and strip, the shape control accuracy of the product is an important indicator reflecting the product quality. In terms of shape control, many shape control technologies have appeared one after another, such as hydraulic roll bending, roll t...

AI Technical Summary

Problems solved by technology

[0003] Long-term studies have found that in the production process of hot-rolled strip steel using CVC technology, due to the groove-shaped wear of backup rolls and work rolls during work, and the uneven distribution of wear along the direction of the roll body, the rolling force and work roll Under the action of roll bending force, it will form a roll shape with a concave middle part of the back-up roll or a work roll roll body, and a protruding roll shape at both ends, so that the contact stress between the work roll and the end of the back-up roll body will increase rapidly. When the contact stress exceeds the roll When the yield limit is reached, plastic deformation occurs, and multiple alternating deformations will cause microcracks in the roll. After the crack expands, it is easy to cause the roll to collapse and peel off.

For the CVC mill, it adopts a special S-shaped curve, which changes the contact situation between the rolls, which is more likely to cause failure at the end of the backup roll and shorten the service life of the roll

In order to avoid or delay the occurrence of this failure, many hot rolling mills usually use chamfering at the end of the back-up roll to reduce the pressure in the contact stress concentration area between the back-up roll and the work roll, but the field application effect is not ideal

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