Calibration method for finishing mill

Abstract

The invention discloses a calibration method for a finishing mill. The method comprises the following specific steps that firstly, the rigidity value situations (KnWS and KNds) on the two sides of racks of finish rolling are obtained through the automatic mill rigidity calibration technology; secondly, according to a mill spring equation: h=S0+(F-F0) / K, a difference value formula of roll gaps on the two sides of the mill is obtained and shown as: delta hWS-DS=delta KDS-WS*(F-F0) / (KWS*KDS); thirdly, first-time automatic calibration is conducted on roll gaps of all the racks of finish rolling according to the second step, the whole process is free of manual intervention, and the roll gaps are cleared; fourthly, roll gap calibration is conducted again, corresponding intervention is conducted on the roll gaps of the racks to adjust delta hn , the roll gaps at the position are cleared again, the roll gap difference value of the nth rack is calculated according to the roll gap difference value formula and shown as: delta hn=(KnDS-KnWS)*(Fn-Fbiao) / (KnDS*KnDS), the calibration rolling force deviation delta Fn is generated and recorded, the roll gaps at the position are cleared, and a hydraulic cylinder uplifts to finish the second-time calibration process. The calibration method is a brand new finishing mill calibration method high in precision and high in applicability to actual hot rolling production.

Description

technical field [0001] The invention relates to a calibration method, in particular to a calibration method for a finishing mill. Background technique [0002] In the basic automation control of modern hot rolling mills, the finishing mill is automatically controlled by the hydraulic roll gap system. When the finishing mill has replaced the work roll or backup roll, the rolling line of the entire rolling mill has changed. Carry out the zero calibration of the roll gap for the hydraulic roll gap control system of the rolling mill. Through calibration, the zero point standard of rolling force, roll gap position and roll gap inclination can be obtained, and the automatic control function of the AGC system can be realized. Mill roll gap calibration is the prerequisite for the automatic control of the hydraulic roll gap system of the rolling mill, and is a necessary condition for realizing hot rolling production of high-precision products and ensuring stable production. [0003...

AI Technical Summary

Problems solved by technology

[0004] This calibration method is based on the fact that the stiffness on both sides of the rolling mill is ideally balanced, but in reality, due to the different equipment conditions on both sides of the rolling mill, it is difficult to keep the stiffness on both sides of the finishing mill equal, or even have a large difference, which results in automatic calibration of the finishing mill The accuracy of the calibration is not high, which cannot fully meet the complex production conditions of the hot rolling site. The low accuracy of the calibration of the roll gap makes it difficult to control the shape of the finish rolling stand, resulting in rolling instability and rolling waste accidents.