Working Roll Axial Shifting for Strip Profile and Planarity
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Solution Overview
Problem
Existing hot rolling processes in rolling mills struggle to dynamically change the effective contour of working rollers during hot rolling, which affects the profile and planarity of the rolled strips.
Innovation Solution
The method involves axially displacing the working rollers in opposite directions by a specific displacement distance or rate, calculated based on the wear of the running surfaces and the pitch angle of the conical portions, to either reduce or increase the effective contour of the running surfaces.
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 maintain strip profile and planarity quality
Solution Approach 1:
The working rollers are equipped with axial displacing devices that enable dynamic adjustment of roller positions during the rolling process. This allows the effective contour of the running surface to be changed by axially displacing the rollers, thereby adapting the rolling system to maintain strip profile and planarity quality throughout the rolling campaign without stopping for regrinding.
Solution Approach 2:
The invention changes the operational parameters of the working rollers by axially displacing them along their axes. This parameter change (axial position) directly affects the effective contour of the running surface, enabling the system to adapt to wear and maintain manufacturing precision for strip profile and planarity without requiring physical modification of the roller surfaces.
2Manufacturing precision
If working rollers are axially displaced to change effective contour, then strip profile and planarity quality is improved, but the rolling process complexity and device complexity increase
Solution Approach 1:
The working rollers are equipped with axial displacing devices that enable dynamic adjustment of roller positions during the rolling process. This allows the effective contour of the running surface to be changed by axially displacing the rollers, thereby adapting the rolling system to maintain strip profile and planarity quality throughout the rolling campaign without stopping for regrinding.
Solution Approach 2:
The system uses the wear of the running surfaces themselves as the basis for determining axial displacement. By monitoring the wear and calculating the required displacement based on wear measurements and conical portion geometry, the system automatically adjusts the roller positions to compensate for wear, making the system self-regulating without requiring external intervention or complex control systems.
3Duration of action of stationary object
If working rollers are axially displaced to compensate for wear, then the service life of working rollers is extended, but the calculation and control of displacement distance increases process complexity
Solution Approach 1:
The system uses the wear of the running surfaces themselves as the basis for determining axial displacement. By monitoring the wear and calculating the required displacement based on wear measurements and conical portion geometry, the system automatically adjusts the roller positions to compensate for wear, making the system self-regulating without requiring external intervention or complex control systems.
Solution Approach 2:
The invention implements a feedback mechanism where the actual wear of the running surfaces is measured and used to determine the required axial displacement. The control device receives wear information, calculates the appropriate displacement distance based on the conical portion pitch angle, and adjusts the roller positions accordingly, creating a closed-loop control system that extends roller service life while maintaining manageable complexity.
4Manufacturing precision
If the running surfaces have cylindrical contour, then the roller structure is simple, but the effective contour cannot be adjusted to reduce strip crown or improve planarity
Solution Approach 1:
The invention applies a conical portion to the running surface of the working rollers, creating a local geometric feature with a specific pitch angle. This local conical geometry enables the effective contour to be changed through axial displacement, allowing control of strip crown and planarity while maintaining a relatively simple overall roller structure that is easy to manufacture and replace.
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 than Δr/tan(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).