Rolling Mill Roll Chock Positioning for Strip Wedge Control
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Solution Overview
Problem
Existing rolling mill technologies face challenges in accurately adjusting roll chock positions due to wear, leading to axis misalignment and asymmetry in rolled material thickness, which increases maintenance time and costs, and existing methods suffer from measurement inaccuracies and errors in thrust force measurements.
Innovation Solution
A rolling mill system with position measurement devices that measure the wear of roll chocks independently on both the work-side and drive-side housings, allowing for precise adjustment of roll chock positions and control of strip wedge changes, using hydraulic devices and position control systems to maintain accurate alignment and reduce maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional roll chock position measurement methods are used, then measurement can be performed, but measurement accuracy deteriorates due to wear and long stroke
Solution Approach 1:
The patent introduces a reference member as an intermediary element that mediates between the roll chock and the position measurement device. The reference member is provided with a reference surface that contacts the roll chock, allowing the position measurement device to measure the position of the reference member instead of directly measuring the roll chock. This intermediary approach enables accurate measurement of roll chock position changes due to wear without being affected by the wear itself, as the reference member can be replaced or recalibrated.
2Manufacturing precision
If roll chock positions are not accurately controlled, then operational simplicity is maintained, but manufacturing precision deteriorates due to axis misalignment
Solution Approach 1:
The patent replaces complex mechanical alignment systems with a measurement and control system based on position measurement devices and reference members. Instead of relying on purely mechanical methods for maintaining roll chock positions, the system uses electrical or optical position measurement devices to detect positions and control mechanisms to adjust them, thereby achieving high manufacturing precision while reducing overall system complexity.
3Measurement precision
If thrust force measurement methods are used for skew adjustment, then adjustment can be performed, but measurement accuracy deteriorates due to hysteresis errors
Solution Approach 1:
The patent extracts the measurement function from the thrust force measurement system and creates a separate position measurement system using position measurement devices and reference members. By taking out the position measurement function independently from the thrust force measurement, the system eliminates hysteresis errors associated with force measurement and provides reliable, accurate measurements for skew adjustment without being affected by the limitations of thrust force-based methods.
Data Source
AI summary
There are provided a work-side position measurement device and a drive-side position measurement device for directly measuring positions of roll chocks in a rolling direction, and positions of upper and lower working rolls and upper and lower backup rolls in the rolling direction are adjusted to zero point or predetermined positions. Alternatively, a change caused in the strip wedge due to a minute crossing of the axes of working rolls and backup rolls is calculated, and the quantities of leveling of a work-side rolling reduction cylinder device and a drive-side rolling reduction cylinder device are adjusted to make the strip edge equal to or smaller than a predetermined value. Accordingly, the bilateral asymmetry (strip wedge) of the thickness distribution of a rolled material is easily adjusted even in the event that the positions of the roll chocks in the rolling direction are changed due to wear on various components.