Method for improving control accuracy of rolling force of HGC hydraulic cylinder of temper mill

Abstract

The invention relates to a method for improving the control accuracy of a rolling force of an HGC hydraulic cylinder of a temper mill. The method comprises the following steps: determining a pressure in the hydraulic cylinder; determining a pressure of an external pipeline; determining the internal-external pressure difference of the hydraulic cylinder; deducing the relationship between the opening degree of a servo valve of the HGC cylinder, and the pressure according to the determined internal-external pressure difference of the hydraulic cylinder; and controlling the opening degree of the servo valve according to the obtained relationship. According to the invention, control for stability of a flow rate is ensured, the fluctuation of the rolling force of the temper mill can be reduced, and the accuracy of the rolling force is increased, thus the surface quality of steel strips is improved.

Description

technical field [0001] The invention relates to the rolling force control of a strip steel skin pass mill in a cold rolling treatment line, in particular to a method for improving the rolling force control precision of an HGC hydraulic cylinder of the skin pass machine. Background technique [0002] At present, the control system of large-scale processing lines in the iron and steel industry is mainly monopolized by foreign electrical companies, and the skin-passing machine of the galvanizing line, as the main equipment for the surface treatment of strip steel, plays an important role in the production line. The control precision of the rolling force of the skin pass mill on the galvanizing line has a great influence on the quality of the strip steel. At present, most of the domestic skin pass mills adopt foreign control systems, and their rolling force is controlled by PIC controller, which mainly adjusts the opening of the HGC servo valve to adjust the rolling force to mee...

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Problems solved by technology

At present, most of the domestic skin pass mills adopt foreign control systems, and their rolling force is controlled by PIC controller, which mainly adjusts the opening of the HGC servo valve to adjust the rolling force to meet the requirements of strip steel production. During the process of dynamic adjustment of the braking force, the pressure fluctuations in the HGC cylinder are relatively large. The pressure fluctuations in the cylinder make the control of the valve more difficult, and the fluctuation of the rolling force is also large, which affects the control accuracy and has a great impact on the quality of the strip. Big

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