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Double-closed-loop hydraulic control method for roll bending and balancing of working roll

A work roll, double closed-loop technology, applied in the direction of rolling force/roll gap control, etc., can solve the problems of overpressure and cavitation, poor control effect, oil leakage, etc., to achieve small flexible impact, improve control performance, and reduce impact Effect

Active Publication Date: 2013-05-22
WISDRI ENG & RES INC LTD
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Problems solved by technology

[0002] In strip mills or skin pass mills, parallel asymmetric hydraulic cylinders are often configured to achieve roll bending and balance of work rolls; overpressure and cavitation are likely to occur when a single servo valve is used to control asymmetric hydraulic cylinders; In the system, only one valve is usually used for closed-loop control, and the other valve is connected back to the oil circuit. The control effect is poor and the cavity connected to the oil circuit is prone to cavitation; when realizing the work roll balance function, the open-loop control mode produces Large impact, easy to damage equipment and produce oil leakage

Method used

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  • Double-closed-loop hydraulic control method for roll bending and balancing of working roll

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Embodiment

[0024]The double-closed-loop hydraulic control system for work roll bending and roll balance of the present invention is configured on the ultra-thin plate double-stand skin pass machine and the cover-back project skin pass unit. The parameters of the hydraulic cylinder are φ125 / φ70×95, and the servo valve uses D661- 4652-G15. During automatic roll change, the work roll balance adopts double closed-loop positive bending hydraulic control mode, the positive roll bending force is set to 100KN, the back pressure of the bending roll cylinder is controlled at 2MPa, and the hydraulic impact force is less than 10KN when reaching the balance roll changing position; The positive bending control mode of the work roll is adopted regularly, the positive bending force is set to 100KN, and the control accuracy is better than 2%. The control accuracy is better than 2%. When switching from positive bending to negative bending, first control the pressure of the rodless cavity at 1.3728MPa, and...

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Abstract

The invention provides a double-closed-loop hydraulic control method for roll bending and balancing of a working roll, which comprises a negative bending control mode, a positive bending control mode and a balancing control mode. According to the double-closed-loop hydraulic control method provided by the invention, the roll bending control process of the working roll is ensured to be stable, accurate and rapid in response speed; and the flexible impact force is small when the positive and negative roll bending modes are switched, and the impact force is also small during balancing control ofthe working roll.

Description

technical field [0001] The invention belongs to the field of strip rolling mills, in particular to the field of a work roll bending balance system of a cold rolling mill or a skin pass mill. Background technique [0002] In strip mills or skin pass mills, parallel asymmetric hydraulic cylinders are often configured to achieve roll bending and balance of work rolls; overpressure and cavitation are likely to occur when a single servo valve is used to control asymmetric hydraulic cylinders; In the system, only one valve is usually used for closed-loop control, and the other valve is connected back to the oil circuit. The control effect is poor and the cavity connected to the oil circuit is prone to cavitation; when realizing the work roll balance function, the open-loop control mode produces The impact is large, and it is easy to damage the equipment and cause oil leakage. The roll bending balance system of the work roll is the core subsystem of the HAGC (Hydraulic Automatic G...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/62
Inventor 张尚盈丁文红
Owner WISDRI ENG & RES INC LTD
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