A method of improving the precision of rolling force control of hgc hydraulic cylinder of skin pass mill
A technology of control precision and hydraulic cylinder, applied in the direction of rolling force/roll gap control, etc., can solve the problems of affecting the control precision, greatly affecting the quality of the strip steel, and increasing the difficulty of control
Active Publication Date: 2017-11-03
ANHUI MA STEEL AUTOMATION INFORMATION TECH
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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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[0033] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.
[0034] In a preferred embodiment, a method for improving the rolling force control accuracy of the HGC hydraulic cylinder of the skin pass mill includes the following steps: determining the pressure in the hydraulic cylinder; determining the pressure of the external pipeline; determining the pressure difference between the inside and outside of the hydraulic cylinder; according to The internal and external pressure difference of the hydraulic cylinder determined in step (3) pushes down the relationship between the opening of the HGC cylinder servo valve and the pressure, which is completed by the control device; the opening of the servo valve is controlled according to the relationship obtained in step (4), and the rolling force control is controlled. The linear output of the device is co...
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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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IPC IPC(8): B21B37/62
CPCB21B37/62
Inventor 王强
Owner ANHUI MA STEEL AUTOMATION INFORMATION TECH