A control method for zero-elongation tension leveling to improve the c-seeker shape of galvanized sheet

Abstract

A control method for improving the C-seeker shape of a galvanized sheet by tension leveling with zero elongation of the present invention, the method includes the following steps: the production steel weld seam reaches the position of the tension leveler, and the "zero extension" is selected through the operation interface or the button on the operation panel. When the function of "stretching and straightening rate" is put into use, the stretching and leveling machine will automatically set the elongation rate to "0", and the tension will be adjusted to the preset value. value. A control method for improving the C-seeker shape of the galvanized sheet by tension leveling at zero elongation of the present invention can effectively improve the C-seeker shape of the strip steel, avoid scratches on the strip steel, and create a better plate for the subsequent deep processing of the strip steel Shape conditions.

Description

technical field [0001] The invention relates to a control method for improving the C-seeker shape of a galvanized sheet by stretching and straightening with zero elongation. Background technique [0002] The C-warp of galvanized sheet is caused by the different extensions of the upper and lower surfaces in the width direction of the strip. The large extension of the upper surface and the small extension of the lower surface appear as a lower C-warp; otherwise, it appears as an upper C-warp. [0003] This type of plate shape problem is easy to scratch the online equipment during the production process, resulting in scratch defects; the subsequent deep processing such as strip steel stamping has poor formability. Generally, there are several measures to improve the problem of C-seeker shape. [0004] For the skin pass mill driven by two rollers, the difference in roll diameter of the support rolls can be modified to form the speed difference between the upper and lower surfac...

AI Technical Summary

Problems solved by technology

However, this method is limited by the preparation of rolls, and the degree of improvement is uncontrollable, so it cannot improve the C-seeker shape in a timely and complete manner.

[0006] The use of a tension leveler is an effective means to improve the C-seeker shape, but the plastic deformation in the full thickness direction of the strip produced by the tension leveler may have a superimposed effect on the plastic deformation in the subsequent deep processing such as stamping, resulting in tension Correction defects

Therefore, in the quality design process of some automobile sheet steels, it is clearly stipulated that the elongation rate of tension leveling must be 0, which makes it impossible to use the tension leveler

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