Channel steel rolling method

Abstract

The invention discloses a groove-steel rolling method. The obliquity difference between the outside rollers of a pass of orifice and the previous pass of orifice is confirmed in accordance with the suspension height of the roll-collar and the groove depth. Under general conditions, the obliquity difference between the outside rollers of the previous pass of orifice and the next pass of orifice ispositive, i.e. the obliquity of the outside roller of the previous pass of orifice is greater than the obliquity of the outside roller of the next pass of orifice; when the suspension height of a pass is greater than the groove depth and the groove depth is greater than or equal to 110mm, the obliquity difference between the outside rollers of the previous pass of orifice and the next pass of orifice is negative, i.e. the obliquity of the outside roller of the previous pass of orifice is smaller than the obliquity of the outside roller of the next pass of orifice; the stress point of the nextpass or orifice is transferred to the inside roller from the outside roller, and as a result, the phenomenon that the suspension height of the roll-collar is greater than the groove depth and broken-off roll-collar is easy to occur when the groove depth is relatively big; thereby, the rolling production-line maintenance time is shortened and the production efficiency is improved; the invention isparticularly applicable to the field of groove-steel rolling.

Description

technical field [0001] The invention relates to the field of channel steel rolling, in particular to a channel steel rolling method improved on the basis of traditional pass design. Background technique [0002] Current channel steel rolling is usually produced by continuous casting and rolling. In the rolling process, the steel billet becomes a channel steel through multiple rolling passes of rough rolling, intermediate rolling and finishing rolling. Each pass corresponds to a pass. Correspondingly, the pass used for rolling channel steel is a pass system, which includes a series of gradually changing pass patterns. In order to gradually deform the billet to the finished channel steel, the last pass The leg slope of the pass is greater than the leg slope of the next pass. There are two parameters for the slope of the leg of the pass, that is, the slope of the outer roll of the pass and the slope of the inner roll of the pass. For a single pass in the pass system, it is ge...

AI Technical Summary

Problems solved by technology

There are the following ways to solve the frequently occurring "roll ring breaking" problem: 1) Theoretically, the roll ring width of the outer roll can be increased, but due to the limitation of pass width, quantity and roll length, this method is generally not adopted due to difficulties; 2 ) Improve the roll material of the outer roll, from cast iron rolls to cast steel or forged steel rolls, but cast steel or forged steel rolls are easy to stick to oxide scales, resulting in poor product surface quality; However, this method needs to increase the number of rolling passes. Due to the limitation of the number of rolling mills and the length of rolls, this method cannot be implemented.

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