A Method of Obtaining Constant Elongation in Acceleration and Deceleration State

Abstract

The present invention provides a method for obtaining a constant elongation rate under acceleration and deceleration conditions. The entrance strip speed and the exit strip speed are respectively collected, a variable length calculation period is set, the actual value of the elongation is calculated, and compared with the set value of the elongation, the obtained The product of the elongation difference and the elongation adaptive adjustment factor is used as the input value of the PI controller, and the additional control quantities of the rolling force control loop and the tension control loop are output, which are superimposed with the rolling force adaptive adjustment factor to obtain the final The amount of rolling force adjustment. The present invention solves the problem of strip steel slippage during acceleration and deceleration by setting elongation length calculation cycles in different speed sections; through the 3 times root correlation calculation of actual speed, feed-forward control accelerates the adjustment of elongation fluctuation during acceleration and deceleration ; Through the dynamic correction of the actual rolling force and the expected rolling force error of the elongation rate and considering the relationship between the thickness, width and elongation rate, the adaptive factor is set to solve the control accuracy and stability of the elongation rate during the acceleration and deceleration process.

Description

technical field [0001] The invention relates to the field of production of cold-rolled strip tempering mills, in particular to a method for obtaining constant elongation under acceleration and deceleration states. Background technique [0002] In the annealing process, due to the recrystallization of the strip steel, strain aging occurs, and a yield platform will appear in the subsequent processing. This kind of strip steel after annealing is almost completely in a soft state, which is not suitable for processing; and as long as it is slightly stamped Processing, the surface of the strip will produce tensile strain and irregular slip lines. Therefore, the cold-rolled strip after annealing should be mildly smoothed to eliminate the yield platform, increase the tensile strength, make it have good mechanical properties of the strip, improve the shape of the strip, and adjust the surface roughness of the strip to obtain a conforming required steel coils. [0003] Elongation is...

AI Technical Summary

Problems solved by technology

However, in the state of acceleration and deceleration, the speed, tension, rolling force, elongation, and leveling liquid adhesion of the skin pass unit are all in an unstable state, so the fluctuation of the elongation rate is too large, which makes the performance of the strip steel in the acceleration and deceleration section not meet the requirements. Process requirements

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