Hot Rolling Split Roll Torque Detection for Meandering Control
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Solution Overview
Problem
Existing hot rolling methods struggle to accurately control meandering and shape of strips to prevent tail pinching, which leads to damage on work rolls and reduced productivity due to limitations in detection accuracy and response time to sudden meandering events.
Innovation Solution
A hot rolling line equipped with split rolls, torque detectors, and a control system that calculates torque differences and shape torques to adjust screw-down leveling, allowing for precise control of meandering and shape to prevent tail pinching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical methods are used to detect strip meandering, then detection can be performed, but detection accuracy is insufficient due to environmental interference and noise
Solution Approach 1:
The patent replaces optical detection methods with a mechanical detection system using a detection roll that physically contacts the strip. The roll detects meandering through direct mechanical interaction, converting meandering motion into rotational motion that can be measured by detectors mounted on the roll. This mechanical approach eliminates susceptibility to environmental interference such as cooling water and vapor that plague optical systems.
2Reliability
If screw-down leveling control is used to prevent meandering, then meandering control is achieved, but response time is insufficient for sudden meandering events
Solution Approach 1:
The patent applies preliminary action by continuously detecting strip meandering throughout the rolling process using the detection roll, rather than waiting for meandering to occur. The detection roll is positioned to contact the strip before it enters the rolling mill, allowing the system to detect meandering trends early and adjust screw-down leveling in advance. This proactive detection enables faster response to sudden meandering events compared to reactive optical detection after meandering begins.
3Measurement precision
If multiple detection devices are installed to improve detection accuracy, then detection capability increases, but device complexity increases
Solution Approach 1:
The detection roll serves multiple functions simultaneously: it guides the strip through the rolling mill, detects meandering through its rotational movement, and applies preliminary tension to the strip. By combining these functions in a single device, the patent avoids the need for separate detection devices, optical systems, and guidance mechanisms, thereby reducing overall system complexity while maintaining detection accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents tail pinching by accurately controlling meandering and shape, enhancing productivity and reducing damage to work rolls.
Implementation Method 1
a pair of left and right torque detectors configured to detect torques acting on left and right ends of each of the split rolls
Data Source
AI summary
Provided are hot rolling equipment and a hot rolling method for precisely controlling the meandering and plate shape of a steel strip, thereby making it possible to prevent tail end squeezing of the steel strip. Hot rolling equipment (10) for this purpose, for sequentially passing a steel strip (1) through rolling machines (11, 12) and thereby rolling the steel strip (1), wherein a plurality of split rolls (63) capable of contacting the steel strip (1) is provided between the rolling machines (11, 12), and, when the split rolls (63) contact the steel strip (1), detection torques (Td, Tw) acting on the left and right ends of the split rolls (63) are detected by torque detectors (67a, 67b), the reduction leveling of the rolling machines (11, 12) being adjusted on the basis of the detected detection torques (Td, Tw) to control the meandering and plate shape of the steel strip (1).