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Roller eccentricity analytic method and roller eccentricit eliminating device

An analysis method and eccentric technology, applied in the direction of rolling mill control device, rolling force/roll gap control, keeping roll equipment in an effective state, etc., can solve problems such as complex control

Active Publication Date: 2008-12-31
JFE STEEL CORP +1
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Problems solved by technology

[0007] However, in the method disclosed in the above publication, special calculation is required to calculate the amount of vertical eccentricity
Therefore, the control is complicated, so it is desired to provide a method that can replace the above method and can simply and reliably separate the vertical eccentricity component of the backup roll.

Method used

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  • Roller eccentricity analytic method and roller eccentricit eliminating device

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[0084] Such as Figure 4 As shown, the relative phases (0°, 180°, 360°) in the 1st eccentricity correspond to the relative phases (0°, 180°, 360°) in the 3rd eccentricity, but only the relative phases (0°, 180°, 360°) in the 2nd eccentricity degrees, 360 degrees) corresponds to 1st and 3rd eccentricity. Therefore, in the case of only the first to third analysis steps as in the above embodiment, the secondary eccentricity cannot be analyzed simultaneously with at least one of the primary and tertiary eccentricities.

[0085] In this embodiment, refer to Figure 7 A case where at least one of the primary and tertiary eccentricity analyzes and the secondary eccentricity analysis are performed continuously will be described. in addition, Figure 7 is the same as the above embodiment Figure 4 Corresponding explanatory diagram for relative phase. Specifically, after the third analysis step S3, the fourth analysis step is carried out, the absolute phase of the upper and lower b...

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Abstract

The invention relates to a roller off centre analysis method and roller off-off centre removing apparatus for a roller. In non-rolling time, a workpiece roller pair is made into contact state and a support roll pair is made into rotation with determined number of revolution, simultaneously rotation interval of the support roll is executed with Fourier analysis to set a first off centre removing value. Time limit of Fourier analysis of the support roll pair is staggered by 180 DEG relative with phase, in contact roll state, roller rotates according to the first off centre removing controlling value with determined number of revolution, simultaneously Fourier analysis is executed and the first off centre removing controlling value is corrected to set a second off centre removing controlling value. The relative phase is staggered by 180 DEG again, and in contact roll state, roller rotates according to the second off centre removing controlling value with determined number of revolution, simultaneously Fourier analysis is executed and the first off centre removing controlling value is corrected to set a third off centre removing controlling value and to analyze roll off centre of the roller. According to the invention, upper and lower off centre components may be easily and reliably calculated.

Description

technical field [0001] The present invention relates to a method for analyzing roll eccentricity in rolling mills for rolling short stock. Background technique [0002] In the conventional rolling mill, there is a possibility that the uniformity of the thickness of the rolled plate may be reduced due to fluctuations on the surfaces of the work roll pair due to the eccentricity of the backup rolls. In order to prevent such problems caused by fluctuations in the surface of the workpiece roll pair, it has been proposed, for example, to perform Fourier series expansion of the rolling load in the interval of one revolution of the backup roll to analyze the roll eccentricity, and to analyze the roll eccentricity from each frequency component. The method of correcting the surface of the work roll pair with the data calculated from the amplitude and phase in (period). In this method, the surface correction of the workpiece roll pair is automatically performed based on the analysis ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00B21B28/00
CPCB21B37/66B21B37/68B21B2203/16
Inventor 堀纪文铃木英之深水隆
Owner JFE STEEL CORP
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