Micro-tension control system and method of hydraulic tension warm rolling mill

Abstract

The invention relates to a micro-tension control system and method of a hydraulic tension warm rolling mill, and belongs to the technical field of tension control of hydraulic tension warm rolling mills. The micro-tension control system comprises a left tension hydraulic cylinder, a left hydraulic system, a right tension hydraulic cylinder and a right hydraulic system. Each hydraulic system comprises a proportional overflow valve, a servo valve and a proportional pressure-reducing valve. In the stage that tension of a rolled piece is established, the stage that the rolled piece is rolled, and the shutdown stage that pass rolling ends, the opening and closing states of the left proportional overflow valve, the left servo valve, the left proportional pressure-reducing valve, the right proportional overflow valve, the right servo valve and the right proportional pressure-reducing valve are controlled, corresponding control quantities are set for the valves, and therefore the tension hydraulic cylinders can conduct tension closed-loop adjustment through the proportional pressure-reducing valves and tensiometers, or through the proportional overflow valves and the tensiometers. In the feeding and discharging stages of the rolled piece, the tension hydraulic cylinders conduct position closed-loop adjustment through the servo valves and displacement sensors. According to the invention, the tension control mode is simpler and more efficient, the tension control accuracy is effectively guaranteed, and micro-tension rolling of high-fragility or difficult-to-deform metal strip materials is achieved.

Description

technical field [0001] The invention belongs to the technical field of tension control of hydraulic tension rolling mills, in particular to a micro tension control system and method of hydraulic tension warm rolling mills. Background technique [0002] At present, the hydraulic tension warm rolling mill used in the experiment can conduct on-line heating and tension rolling of a single piece of metal strip sample, creating technical conditions for carrying out experimental research on the warm rolling process of metals that are difficult to deform at room temperature and for realizing the industrial production of thin metal strips . [0003] For metal strips that are relatively brittle or difficult to deform at room temperature, it is usually necessary to carry out warm rolling under the condition of micro tension (<3kN) after online heating. In order to ensure the rolling accuracy of the rolled piece, it is necessary to ensure the control of micro tension precision. How...

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Problems solved by technology

However, the existing tension control method is to realize the position closed-loop control and tension closed-loop control of the tension hydraulic cylinder while controlling the flow rate of the servo valve. It is suitable for the cold rolling process, but for the warm rolling process, because the forward slip rate and the rear slip rate are related to factors such as friction coefficient, reduction rate, thickness calculation accuracy, etc., and the friction coefficient is related to the temperature of the rolled piece, the temperature of the roll and the surface roughness of the roll Therefore, the calculation error of the front slip rate and the back slip rate in the warm rolling process is relatively large, so that the tension control accuracy in the warm rolling process is not high, and the strip breakage often occurs during the rolling process

Therefore, the existing tension control method is not suitable for hydraulic tension warm rolling mill

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