Method for controlling asymmetric transverses shifting plate shape of asymmetric bending roller of HC rolling mill

Abstract

The invention discloses a method for controlling an asymmetric transverses shifting plate shape of an asymmetric bending roller of a HC rolling mill. The method comprise the following steps of: (a) collecting equipment and process parameters of an HC rolling mill and band steel; (b) discretizing a roller system and a rolling piece unit; (c) computing a preceding tensile stress lateral distribution value and a unit width rolling pressure, which comprise the following steps implemented by a computer system; (d) setting bending roller influence coefficients of a supporting roller, a middle roller and a working roller during an asymmetric rolling according to an asymmetric rolling stressed model of the HC rolling mill; and (e) establishing an asymmetric rolling roller system model on the basis of a model partitioning influence coefficient method. The invention provides a roller system elastic distorted model and a metal three-dimensional plastic distortion model which are suitable for the HC rolling mill; and the preceding tensile stress and a plate convexity of the roller system elastic distorted model and the metal three-dimensional plastic distortion model are in an asymmetric distribution, the error compared with a measured value is small and precision is high. After changing adjusting parameters of the plate shape, the asymmetric rolling controlling model is also suitable for symmetric rolling; and the invention improves plate shape controlling ability of the HC rolling mill and achieves precision requirements of industrial application.

Description

technical field [0001] The invention belongs to the field of strip shape control of cold continuous rolling mills, and relates to a strip shape control method for asymmetric bending rolls of HC rolling mills. Background technique [0002] The shape of the strip after rolling is not only related to the shape of the incoming material and its plastic deformation, but also closely related to the elastic deformation of the roll system. Seam shape. Therefore, the establishment of the roll system model plays a very important role in the control of the shape and crown of the strip. [0003] Currently, strip is usually rolled under symmetrical conditions [1，2] (〔1〕Peng Yan: Research on Preset Control Theory and Industrial Application of HC Rolling Mill Cold Rolling Mill Shape Preset Control Based on Strip Element Method [Ph.D. Dissertation], Qinhuangdao, Yanshan University, 2000; Research on Control Function [Master's Dissertation], Qinhuangdao: Yanshan University, 1986), but due ...

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Problems solved by technology

[0004] In order to overcome the problem that the existing HC rolling mill still adopts the traditional symmetrical rolling strip shape control mode in the flatness control, the present invention provides a flatness control method for the asymmetrical roll bending and asymmetrical lateral movement of the HC rolling mill. Based on the model influence function method and the strip element variation method, a complete flatness analysis mathematical model for six-high HC rolling mill asymmetric rolling was developed. important meaning

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