Method for performing two-pass rolling on thickness variable strips

Abstract

A method for performing two-pass rolling on thickness variable strips includes calculating rolling reduction required by a first pass and the length of each section; presetting a target rolling force P<SET> of a second pass; supposing outlet thickness h1_i and h2_i of the first pass, and calculating parameters such as a rolling force and rolling power required by the first pass; if the parameters exceed the capacity of a rolling machine, returning to reset the parameters; calculating deformation resistance KF1_i and KF2_i of a first-pass outlet strip according to outlet thickness of the first pass; calculating a second-pass rolling force Fr1 and Fr2 required for rolling the strip from h1_i and h2_i into hi and h2, judging whether Fr1 and Fr2 are equal to the target rolling force P<SET> of the second pass, resetting h1_i and h2_i if Fr1 and Fr2 are not equal to the target rolling force P<SET> of the second pass, and performing returning again; calculating corresponding outlet length. According to the method for performing two-pass rolling on thickness variable strips, by means of two-pass rolling, large rolling reduction is achieved without increasing rolling capacity; a constant rolling force manner is used for the second pass so that the shape of the strips is corrected.

Description

technical field [0001] The present invention relates to a rolling method for rolling variable-thickness strips in the field of metallurgy. In particular, the present invention relates to a two-pass rolling method for rolling variable-thickness strips, that is, two-pass rolling is used to achieve periodic rolling. Variable thickness rolling, specifically, the first pass achieves most of the reduction, while the second pass uses constant pressure rolling, which can not only further reduce the strip, but also adjust the shape of the strip. correction. The variable-thickness strip refers to the continuously changing longitudinal thickness of the exported strip, and the rolled strip can be strip and other cold-rolled materials, such as aluminum. Background technique [0002] In order to achieve the goal of automobile lightweight, the automobile industry is currently promoting the use of a strip with a continuously changing thickness obtained through rolling - thickened plate. T...

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Problems solved by technology

[0005] The patent 200910012395.6 published by Northeastern University mentions that two passes are used to complete thickening rolling. The method mentioned in the patent is to roll out a certain profile in the first pass, and to use micro-tracking in the second pass. Rolling control is carried out according to the shape of the incoming material, and the realization of this method has higher requirements for the recognition accuracy of the incoming material contour. It is not easy to set different rolling parameters according to the identification results

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