Method for testing hydraulic state of dynamic roll gaps through static pressure maintaining

Abstract

The invention discloses a method for testing the hydraulic state of dynamic roll gaps through static pressure maintaining. According to the method, the hydraulic pressure of F1-3 rolling mills is maintained to be 1500t for 5 minutes, the hydraulic pressure of F4-7 rolling mills is maintained to be 1000t for 5 minutes, and in addition, a next process is executed in 5 minutes: the position differences of two oil cylinder pistons in each loop are detected; internal leakage of oil cylinders is detected; the inclination of the pistons relative to cylinder bodies is detected. The method for testing the hydraulic state of the dynamic roll gaps through static pressure maintaining has the advantages that the hidden danger of a machine frame hydraulic system can be found in time, and the thin plate rolling stability of heat continuous rolling mills at high speed and high rolling force can be improved. The method provided by the invention can be used for completing the test in a short time, in addition, the original hydraulic system is utilized, and the addition of any hardware investment is not needed.

Description

technical field [0001] The invention relates to the automatic control technology of hot-rolled strip steel, in particular to a method for testing the hydraulic state of dynamic roll gap by using static pressure holding. Background technique [0002] At present, the commonly used finishing rolling equipment is composed of seven stands from F1 to F7, which is an irreversible hot continuous rolling unit. Usually, the intermediate product from the roughing mill will be rolled into the target hot-rolled finished strip required by the design after continuous rolling of seven stands. Since the finishing rolling unit has many rolling specifications, the width is from 650mm to 1900mm, the thickness is from 1.2mm to 25.4mm, and the rolling speed can reach up to 21 m / s, so the hydraulic stability of the rolling mill determines whether the rolling is smooth or not. Especially when rolling thin plates, due to the high speed of strip threading, acceleration, and steel throwing, once the ...

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Problems solved by technology

[0006] The existing technology adopts the zero-adjustment method, which can ensure the rolling stability under the premise that no serious internal leakage occurs in the hydraulic equipment, but the internal leakage of the hydraulic cylinder and the state of each hydraulic valve cannot be found through the zero-adjustment process. The original internal leakage and the state of the hydraulic valve are dynamically changing when the force is increasing. Therefore, the hydraulic pressure of the rack during the actual rolling of the strip is incomparable with the static zero-adjustment state.

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