A method for controlling roll gap in rolling mill during speed change

Abstract

The invention discloses a method for controlling the roll gap of a rolling mill during the speed change process, comprising the following steps: 1, collecting rolling parameters: B, ν, E, h 0 , h 1 , σ 1 , σ 0 , k m , r, R, M, n, n 0 , P 0 ;2, define the process variable i=0, j=0; 3, set the flattening radius R' of the work roll i , and let R′ i =R, i=i+1; 4, according to the rolling pressure formula, calculate the rolling pressure P i ;5, Solving the flattening radius of the work roll; 6, Judging |R′ i ‑R′ yj |<ε is true, if true, go to step 7, otherwise, reset R′ i , and turn to step 4; 7, output the rolling pressure value; 8, calculate the elastic deformation of the stand in the variable speed rolling process of the rolling mill; 9, calculate and output the roll gap value of the rolling mill, which solves the difficulty in controlling the thickness of the strip head and tail , and avoid problems such as rolling instability and rolling waste accidents, improve the product yield, and bring economic benefits to the enterprise.

Description

technical field [0001] The invention relates to the technical field of rolling process automatic control, in particular to a method for controlling the roll gap of a rolling mill during the speed change process. Background technique [0002] In recent years, with the rapid development of the automobile industry, shipbuilding, home appliances, and power electronics, the market demand for products has continued to increase. Demand is reflected in output on the one hand, and product quality on the other. Therefore, strip production enterprises need to improve production efficiency while ensuring that products have good quality, improve product competitiveness, and bring greater economic benefits to enterprises. [0003] When the strip production enterprise continuously produces strip steel, when the weld of the strip passes through the roll gap of the rolling mill, the rolling mill will take measures to reduce the speed to roll the strip. Once the weld of the strip leaves the ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a control method for rolling mill roll gap in the process of speed change, by solving the accurate rolling force value, then using the bounce equation to calculate the amount of bounce, and finally determine the roll gap setting value, thereby solving the problem of strip head Tail thickness is difficult to control, and problems such as rolling instability and rolling waste accidents can be avoided, and the product yield rate can be improved to bring economic benefits to the enterprise

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