Method and device for adjusting strip steel transverse warping by using pinch rolls

Abstract

Disclosed is a method for adjusting strip steel transverse warping by using pinch rolls. The method can eliminate defect of transverse warping produced in actual production by optimizing roll shapes of the pinch rolls. Two pairs of pinch rolls in different roll shapes are arranged on a coiling machine; central lines of the two pairs of pinch rolls are in the same straight line; one pair of the pinch rolls 1 is disposed in front of the coiling machine and employs roll shape that an upper roll has positive convexity degree and a lower roll has no convexity degree; and the other pair of the pinch rolls 3 is disposed in the rear of the coiling machine and adopts the roll shape that an upper roll has positive convexity degree and a lower roll has negative convexity degree. When requirements on shapes of strip steels are not too high or transverse warping is not serious, the pinch rolls 1 work; when the transverse warping is serious, the pinch rolls 3 can work. Roll shape curves employ a second power function, and parabola of the second power function is determined according to transverse warping values in actual production. Accordingly, transverse warping defect is eliminated or minimized to an allowable range through the reverse regulation.

Description

technical field [0001] The invention relates to a continuous hot rolling process of strip steel in the metallurgical industry, in particular to a method for controlling the shape of a hot strip steel strip by using a pinch roll device of an undercoiler in a hot continuous rolling line of the strip steel. Background technique [0002] The thermal stress and phase change stress generated by the uneven internal temperature distribution of the strip steel in the laminar flow process cause a large residual stress in the transverse direction of the strip steel, which leads to the lateral instability of the strip steel and bending, and the bending direction is in the middle. Arched, with both ends pointing down, producing transverse warping of the strip. [0003] Strip transverse warpage is a common problem in hot-rolled strip production. This defect not only affects the shape of the hot-rolled strip, but also has many adverse effects on the cold-rolled pickling line. For example,...

AI Technical Summary

Problems solved by technology

[0008] Since the production process (such as the temperature of the finishing mill and the coiling temperature) has matured, changing the existing process will affect the structure and properties of the strip, thereby affecting the quality of the strip

Changing the existing cooling equipment is a costly and time-consuming project. At the same time, due to many influencing factors, the mechanism of lateral warpage is complicated, and the effect of changing the strip cooling process and cooling equipment is not obvious.

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