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; secondly, the wave form of the cold-rolled strip is also more complicated, showing periodicity in sections along the rolling direction, There is no obvious pattern along the width direction

Therefore, the above-mentioned method has a certain degree of subjectivity, or requires actual measurement of the deflection form, especially in the setting of the deflection function in the width direction of the strip, which is difficult to reflect its complex deformation law

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