Method for adjusting three-roll mill roll gap controller

Abstract

The invention discloses a method for adjusting a three-roll mill roll gap controller. The roll gap controller is characterized in that the adjusting method comprises the steps of: A. deducing controller parameters Kp, Ki and Kd through a neural network and calculating control signals by increment control equations for adjusting the controller; and B. Balancing a rolling force: acquiring corresponding values of a off-line measuring position and pressure, calculating rolling force deviation of the roll to be compensated on a stand according to a curvilinear equation generated from a sampling point, and compensating the control signals through the calculated displacement deviation. The invention uses the neural network to calculate proper controller parameters so as to make the control more accurate. Meanwhile, the roll gap controller adopts a centering compensating method, thus the roll gap controller can avoid position deviation of roll gap resulted under the action of rolling pressure. In addition, the adjusting method for balancing rolling force solves the problem of uneven load distribution in different directions of a pipe so as to achieve uniformity of wall thickness of a product and improve productivity of the product.

Description

technical field [0001] The invention relates to a control method of a rolling mill, in particular to a method for adjusting a roll gap controller of a rolling mill. Background technique [0002] At present, the HGC (Hydraulic Gap Control, Hydraulic Gap Control) system of hot rolling seamless steel pipe factories at home and abroad will expose a problem in production and product quality: the wall thickness of the steel pipe coming out of the rough rolling stand in the front fluctuates greatly, so that the The accuracy of the final finished rack has a big impact. In addition, due to the large thickness fluctuation, the tension control and rolling force of the pipe will also have large fluctuations. The result is that the subsequent frame vibrates severely, and the pipe body is prone to water ripples or bending. The main reason for the large thickness fluctuation is that the position control method adopted by the front frame is not in an ideal state in terms of precision contr...

AI Technical Summary

Problems solved by technology

[0002] At present, the HGC (Hydraulic Gap Control, Hydraulic Gap Control) system of hot rolling seamless steel pipe factories at home and abroad will expose a problem in production and product quality: the wall thickness of the steel pipe coming out of the rough rolling stand in the front fluctuates greatly, so that the The accuracy of the final finished frame has a great influence

The disadvantages of this approach are: (1) accuracy

In this way, when the rolling force fluctuates seriously during the rolling process, the instantaneous fluctuation of the compensation value will be very large, and it is easy to increase the vibration due to frequent adjustment

Images