Axial Work Roll Shifting for Hot Strip Profile and Planarity
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Solution Overview
Problem
Existing rolling mill technologies fail to effectively change the effective contour of working rollers during hot rolling, leading to inconsistent strip profiles and planarity, particularly due to wear-induced changes in the running surfaces of rollers.
Innovation Solution
A method and apparatus that utilize axial displacement of working rollers in a roll stand, with separate displacing devices for each roller, to adjust the effective contour of the running surfaces by controlling the displacement distance and rate based on wear measurements, allowing for targeted reduction or increase of the contour to influence strip profile and planarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If working rollers are not axially displaced during hot rolling, then the rolling process is simple and continuous, but the effective contour of the running surface cannot be changed to compensate for wear, leading to inconsistent strip profile and planarity
Solution Approach 1:
The working rollers are equipped with axial displacement capability, transforming from a static to a dynamic system. The rollers can be axially displaced during the rolling process to change the effective contour of the running surface, allowing compensation for wear and maintaining consistent strip profile and planarity throughout the rolling campaign.
Solution Approach 2:
The effective contour parameter of the running surface is changed by axially displacing the working rollers. By controlling the displacement distance and rate, the system adjusts the effective contour to compensate for wear-induced changes, thereby maintaining manufacturing precision of the strip profile and planarity.
2Manufacturing precision
If working rollers are axially displaced to compensate for wear, then strip profile and planarity improve, but the device complexity and operational complexity increase
Solution Approach 1:
The system incorporates feedback control where the axial displacement of the working rollers is based on measured wear of the running surface. The displacement distance and rate are determined by the actual wear conditions, creating a closed-loop control system that automatically adjusts the roller position to maintain the desired effective contour and compensate for wear.
Solution Approach 2:
The working rollers essentially self-adjust their position to compensate for their own wear. The displacement system responds to wear conditions and automatically repositions the rollers to maintain the correct effective contour, reducing the need for manual intervention and simplifying operation.
3Manufacturing precision
If the running surface contour is changed during rolling, then wear compensation is achieved, but the rolling process time and control complexity increase
Solution Approach 1:
The working rollers are pre-positioned with their initial contours designed to account for expected wear patterns. The axial displacement system is ready to activate at predetermined intervals or when wear thresholds are reached, allowing for proactive rather than reactive adjustments, thereby minimizing downtime and maintaining continuous production.
Data Source
AI summary
The present invention relates to a method and an apparatus for changing the effective contour of a running surface (8) of a working roller (3, 4) during the hot rolling of rolling stock in a roll stand (2) to form a rolled strip (1). The intention is to be able to change the contour of the running surface (8) during the hot rolling by means of the invention. This object is achieved according to the invention by the axial displacement of the working rollers (3, 4) in opposite directions by a displacement distance s, wherein s is greater or less thanΔrtan(α)and Δr indicates the wear of the running surface (8) in the radial direction (R) and α indicates the pitch angle of the conical portion (7) of the respective working roller (3, 4).