Supporting roll used for carrying out hot rolling on 2250 leveling unit and design method for roll barrel roll shape of supporting roll

Abstract

The invention discloses a supporting roll used for carrying out hot rolling on a 2250 leveling unit. The supporting roll comprises a roll barrel arranged in the middle and roll necks arranged at two sides, the roll barrel comprises a rolling area and harmful contact areas, the roll shape of the rolling area is a linear section, the rolling shapes of the harmful contact areas at the two sides are both VCR curves in the shape of a parabola, and the two VCR curves are arranged at the two ends of the roll barrel symmetrically by using the midpoint and the axis of the roll barrel as the original point and the X axis and using the Y axis as the symmetric axis. The design method for roll barrel roll shape of the supporting roll used for carrying out hot rolling on the 2250 leveling unit comprises the following steps that 1, a working roll is determined to be a plain-barrel roll; 2, the overall convexity of the roll barrel is determined; 3, the distance between the bending-starting position of the roll barrel and the midpoint is determined; 4, a VCR roll shape curve model of the harmful contact areas is determined; 5, the integrated shape of the roll barrel is determined. The supporting roll used for carrying out hot rolling on the 2250 leveling unit has the advantages of reducing the number of the harmful contact areas, improving the roll-bending effect, enabling contact pressure between rolls to be distributed evenly, improving strip shape quality and being small in working roll consumption, and can be widely applied to the technical field of hot rolling leveling.

Description

technical field [0001] The present invention relates to the technical field of hot continuous rolling, in particular to a back-up roll used for a hot rolling 2250 skin pass mill and a method for designing the roll shape of the roll body. Background technique [0002] In recent years, domestic steel mills have developed high-strength thin-gauge hot-rolled strips to replace imported strips, such as high-strength construction machinery steel, high-strength automotive structural steel, high-strength mining structural steel, high-strength wear-resistant steel, high-strength Grade marine steel and other fields. Since the flattening process of the strip is carried out by the roll, the shape of the roll body of the roll directly affects the shape of the strip, which involves technical difficulties such as the shape quality, surface quality, work roll consumption and related regulation of the flattened strip. [0003] In order to produce better shape, many domestic steel mills have ...

AI Technical Summary

Problems solved by technology

[0005] However, due to the relatively large length and diameter of the work roll 3 of the hot-rolling 2250 tempering unit, the hydraulic bending roll can only affect the shape of the strip 4 edges, resulting in unsatisfactory control of the shape of the work roll 3, and at the same time causing serious wear and tear on the work roll 3. Big

It can be said that the conventional practice of only changing the shape of the work rolls cannot achieve the expected purpose of improving the quality of the plate shape on the hot rolling 2250 skin pass unit

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