Rolling Stand Imaging for Steel Sheet Meandering Detection
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Solution Overview
Problem
Existing methods for monitoring steel sheet meandering and deformation during rolling are inadequate, particularly at the entry point of rolling stands, leading to potential contact with side guides and defects in the steel sheet, and fail to ensure stable rolling processes.
Innovation Solution
A rolling apparatus equipped with an imaging unit positioned between rolling stands to image the steel sheet entering the mills, allowing operators to recognize meandering and deformation, and adjust conditions to prevent contact with side guides, ensuring stable rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If rolling load deviation is used to detect meandering, then control method is simple, but measurement accuracy is affected by rolling mill shape and thickness distribution
Solution Approach 1:
The mechanical measurement method based on rolling load deviation is replaced with an optical imaging system that directly visualizes steel sheet position, eliminating the influence of rolling mill shape and thickness distribution on measurement accuracy
2Ease of operation
If side guides are disposed on the entering side of rolling stands, then steel sheet width positioning is improved, but contact between meandering steel sheet and side guides causes defects
Solution Approach 1:
The imaging device provides real-time visual feedback on steel sheet position at the rolling stand entry, enabling operators to adjust the steel sheet position before it contacts the side guides, preventing defects through continuous monitoring and correction
3Device complexity
If meandering control is performed based on load deviation, then control process is simple, but deformation in thickness direction cannot be detected
Solution Approach 1:
The imaging device serves multiple functions simultaneously: it detects both width-directional meandering and thickness-directional deformation of the steel sheet, providing comprehensive monitoring capability from a single system
Data Source
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AI summary
[Object] To provide a rolling apparatus that enables an operator to recognize the rolling status such as the behavior of the steel sheet entering the rolling stand and enables a stable rolling process. [Solution] A rolling apparatus 10 includes a plurality of rolling stands 11 each including a pair of rolling mills 12, and an imaging unit 15 provided between adjacent rolling stands 11A and 11B, the imaging unit 15 being configured to image a steel sheet 1 entering a pair of rolling mills 12B of the rolling stand 11B from an upstream side of the rolling stand 11 A located on a downstream side in a rolling direction. The imaging unit 15 is disposed so as to satisfy the following equation (1), on the upstream side in the rolling direction Z of the rolling stand 11B, in a central portion in the width direction of the steel sheet in an area P in which the steel sheet 1 is able to be conveyed: 2×L×tanα/2>Wmax wherein L represents a distance in the rolling direction between the rolling stand 11B located on the downstream side in the rolling direction and the imaging unit 15, α represents a horizontal viewing angle of the imaging unit, and Wmax represents a maximum width of the steel sheet 1.