A Composite Measurement Method of Online Strip Elongation

Abstract

The invention discloses an on-line compound measurement method for elongation of strip steel. The method comprises the following steps: installing length-measuring rollers in contact with strip steel and a non-contact laser velocimeter respectively before and after leveling a frame; establishing tension on strip steel Finally, when the unit runs to the elongation effective measurement speed and rolling force, open the elongation measurement window; respectively calculate the elongation under the two measurement methods; , using the error screening strategy to calculate the dynamic weights of elongation under the two measurement methods; exponential smoothing is performed on the dynamic weights of elongation under the two measurement methods; the elongation and dynamic weights under the two measurement methods , do the weighted average calculation to get the composite elongation. The present invention can flexibly configure the number of length-measuring roller encoders and laser velocimeters according to the measurement accuracy requirements, thereby reducing costs, effectively reducing measurement errors, and improving elongation measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a composite measurement method for online strip elongation. Background technique [0002] In the cold rolling process, the steel coil after cold rolling and annealing can improve the mechanical properties of the strip, improve the shape of the strip, and adjust the surface roughness of the strip through smoothing. Temper rolling is actually a secondary cold rolling with a small reduction rate. Due to the small reduction, it is difficult to measure the strip thickness deviation at the entrance and exit of the temper mill with a thickness gauge. Therefore, temper rolling is more focused on the control of the elongation of the strip, so as to obtain a good shape and surface quality of the strip. Elongation is the only indicator to control the mechanical properties of strip steel in temper rolling. Its value is given according to the steel structure characteristics and end use. I...

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Problems solved by technology

However, the instrument has high requirements on the working environment, is easily affected by emulsion and water mist, and has certain requirements on the surface of the strip steel. For example, when the thin strip steel is not stretched, the speed measurement is not accurate.

[0011] The two measurement methods have their own advantages and disadvantages, and the elongation rate is calculated by length and speed respectively, which is difficult to achieve flexible configuration

[0012] A high-configuration production line will use a combination of length measuring roller encoder and laser speedometer. Once a certain measurement method fails, it can only be shut down and then switched to another measurement method, which cannot achieve undisturbed switching.

Correspondingly, the work intensity of the operator is increased, and the work efficiency is reduced; in addition, once a certain measurement method fails, the output of the elongation controller reaches the limit, which may lead to broken belts, thereby increasing the difficulty of handling accidents and the recovery time of failures. Ultimately reduce the output per unit time of the processing line

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