A Method of Improving Calibration Accuracy of Roll Gap in Finishing Mill

Abstract

The invention relates to a method for improving roller gap calibration precision of a finishing mill. The method comprises the steps that primary horizontal roller calibration is carried out after roller changing of the finishing mill; simulating rolling is carried out, and whether data setting and on-site equipment action are normal or not is confirmed; rolling is started, and the actual plate shape condition of a strip steel head is judged, so that a reference is provided for subsequent secondary calibration adjustment; after finish rolling is carried out, secondary roller gap calibration correction is carried out; normal rolling is continuously carried out until a set of rollers are discharged from the finishing mill; primary calibration is carried out after new working rollers replaceprevious working rollers for finish rolling, and the primary calibration is adjusted according to the data recorded during the secondary roller gap calibration of the previous roller stage; and the horizontal gap calibration of each roller stage for finish rolling is carried out by executing the steps in a circulation mode. According to the method for improving roller gap calibration precision ofthe finishing mill, the existing method for calibrating the roller gap of the finishing mill is innovated, the method can be completed in two steps, and namely, the concept of secondary calibration correction is established; and the idea that in the roller stage of one supporting roller, the roller gap deviation Delta S and the rolling force deviation Delta F of the calibration positions of the previous set of working rollers are set as the benchmark for calibration of each time is established, so that the calibration benchmark is more accurate, and calibration is more rapid.

Description

technical field [0001] The invention relates to the technical field of finishing mill calibration, in particular to a method for calibrating the horizontal roll gap of a finishing mill stand. 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 rolls and backup rolls, 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...

AI Technical Summary

Problems solved by technology

At present, the general calibration method is based on the situation that the rolling mill is in an ideal balance. However, in reality, due to the different conditions of the equipment on both sides of the rolling mill, and the large difference in the stiffness of the two sides of the finishing mill, the accuracy of the calibration is not high, and it cannot fully meet the requirements of hot rolling. The complex production situation on site makes it difficult to control the shape of the finish rolling stand, resulting in unstable rolling and rolling scrap accidents

[0004] Aiming at the problem that due to factors such as equipment assembly differences and increased gap wear, the accuracy of one-time calibration of the finishing mill roll gap is not high, and the stability of rolling after changing rolls cannot be guaranteed.