Prediction compensation method for back-up roller eccentricity of cold-rolling mill

Abstract

The invention provides a prediction compensation method for back-up roller eccentricity of a cold-rolling mill. The method includes the steps that enable signals and starting signals of eccentricity compensation are determined, and the datum inlet and outlet thickness difference and datum rolling force value are stored; after the eccentricity compensation is started, the prediction outlet thickness difference at the position of an outlet thickness gauge is predicted according to the relative inlet thickness difference, and then the prediction outlet thickness difference is compared with a measured outlet thickness difference to obtain eccentric signals; and an on-line recursive algorithm is used for estimating the parameters of eccentric body signals, and the corresponding roller gap compensation amount is calculated according to the reconstituted eccentric body signals. According to the prediction compensation method for back-up roller eccentricity of the cold-rolling mill, the relative thickness calculation mode is adopted, and thus the mixed-in noise and interference in the thickness difference detection link cannot influence calculation results; and the on-line recursive methodis adopted for estimating unknown parameters in the back-up roller eccentric body signals, no detecting element with the back-up roller rotating angle is required, the bad influence on the outlet thickness by back-up roller eccentricity can be accurately compensated for, the thickness precision of products is improved to a great extent, and production efficiency is also improved.

Description

technical field

[0001] The invention relates to the field of automatic thickness control of a cold rolling mill, in particular to a method for estimating and compensating the eccentricity of a backing roll of a cold rolling mill. Background technique

[0002] Due to the irregular shape of the roll and the roll bearing, the rotation axis and the geometric axis of the roll do not exactly coincide, which is called roll eccentricity. These irregular shapes may occur in the manufacture, grinding, assembly, wear, thermal expansion, etc. of the roll. In the process, since the roll diameter of the backup roll is much larger than that of the work roll and the intermediate roll, the eccentricity of the roll is mainly caused by the non-circle of the backup roll itself and the out-of-axis of the roll diameter and other rolls.

[0003] In the production of strip steel, the eccentricity of the backup roll will cause the automatic thickness control system of the rolling mill to adjust in t...

Examples

Embodiment Construction

[0076] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0077] The thickness control system of a single-stand six-high reversing cold rolling mill is as follows: figure 1 As shown in the figure, the current rolling direction is from left to right, and the next pass will be from right to left, and then reverse the rolling repeatedly. In the current pass, the strip steel 6 is started from the entrance coiler 1, passed through the diverting roll 2 and then rolled in a six-high rolling mill, where 7 and 8 are the upper and lower support rolls of the rolling mill, and the hydraulic cylinder 4 provides rolling Force, then through the steering roller 12, finally coiled on the exit coiler 13. The unit is equipped with first and second laser speed gauges 3 and 10, which are respectively used to measure the speed at the entrance and exit of the rolling mill, and is also equipped with first and second thickness gaug...

technical field

[0001] The invention relates to the field of automatic thickness control of a cold rolling mill, in particular to a method for estimating and compensating the eccentricity of a backing roll of a cold rolling mill. Background technique

[0002] Due to the irregular shape of the roll and the roll bearing, the rotation axis and the geometric axis of the roll do not exactly coincide, which is called roll eccentricity. These irregular shapes may occur in the manufacture, grinding, assembly, wear, thermal expansion, etc. of the roll. In the process, since the roll diameter of the backup roll is much larger than that of the work roll and the intermediate roll, the eccentricity of the roll is mainly caused by the non-circle of the backup roll itself and the out-of-axis of the roll diameter and other rolls.

[0003] In the production of strip steel, the eccentricity of the backup roll will cause the automatic thickness control system of the rolling mill to adjust in t...

Examples

Embodiment Construction

[0076] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0077] The thickness control system of a single-stand six-high reversing cold rolling mill is as follows: figure 1 As shown in the figure, the current rolling direction is from left to right, and the next pass will be from right to left, and then reverse the rolling repeatedly. In the current pass, the strip steel 6 is started from the entrance coiler 1, passed through the diverting roll 2 and then rolled in a six-high rolling mill, where 7 and 8 are the upper and lower support rolls of the rolling mill, and the hydraulic cylinder 4 provides rolling Force, then through the steering roller 12, finally coiled on the exit coiler 13. The unit is equipped with first and second laser speed gauges 3 and 10, which are respectively used to measure the speed at the entrance and exit of the rolling mill, and is also equipped with first and second thickness gaug...

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