Method for predicting waving form of thin cold-rolled strip steel in width direction

Abstract

The invention provides a method for predicting the waving form of thin cold-rolled strip steel in the width direction. The method is implemented on the basis that the residual stress value and the coordinate values of the thin cold-rolled strip steel are obtained and comprises the following steps that (1), a left auxiliary vector and a right auxiliary vector are calculated; (2), the residual stress positive maximum value vector including the endpoint value and the coordinate vector are calculated; (3), the residual stress negative minimum value vector including the endpoint value and the coordinate vector are calculated; (4), the width vector is calculated; (5), the amplitude vector is calculated; and (6), a function for the waving form in the width direction is determined. By the adoption of the method, a waving area and the waving form in the width direction of the thin cold-rolled strip steel can be predicted, and the capacity of evaluating the strip steel quality during cold rolling production is improved.

Description

technical field [0001] The invention belongs to the field of plate and strip rolling, and relates to a method for predicting the wave form in the width direction by using the detected residual stress value in the production of cold-rolled thin strip steel. Background technique [0002] The stability of the strip after rolling is an important branch of the shape problem in cold rolling, and it is the mechanical basis for a good standard of shape discrimination. In the production of cold-rolled strip steel, if the plastic elongation in the rolling direction is unevenly distributed along the width direction, the strip steel will produce in-plane residual stress. When the uneven plastic elongation reaches a certain level, the strip steel will Visible waves are produced. [0003] At present, there are several methods for analyzing the wave problem of cold-rolled strip steel: [0004] 1. Document 1 (Yang Quan. Research on Buckling Theory and Shape Control Objectives of Cold-roll...

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Problems solved by technology

However, there are two problems in doing so: First, according to the field measured data, the residual stress of cold-rolled strip steel has a very complex distribution form, and some local characteristics generally exist, such as stress peaks, which change sharply along the width direction, and The direction also changes, and there is often a qualitative change in form, such as the tendency of the middle wave to change to the tendency of the side wave; seco

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