Asymmetric Work Roll Profile for Strip Shape Compensation
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Solution Overview
Problem
Current plate/strip rolling mills struggle to effectively address asymmetric plate profiles, leading to defects such as center-deviation, tail flick, and production instability, as existing methods fail to compensate for the non-symmetric processing of metal plate/strip products.
Innovation Solution
A compensation method is introduced where the work rolls of the rolling mill are ground with a non-linear asymmetric no-load roll contour profile curve, forming a corresponding non-linear asymmetric roll gap between the upper and lower work rolls, utilizing polynomial equations to enhance profile accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If symmetric roll profile is used, then manufacturing simplicity is maintained, but asymmetric plate profile defects occur
Solution Approach 1:
The patent applies asymmetry principle by designing the work roll profile with asymmetric curvature distribution relative to the roll center. The formula for roll profile curvature includes asymmetric terms (odd-powered terms in the polynomial expansion) that create different curvature characteristics on either side of the roll center, thereby compensating for the asymmetric plate profile defects while maintaining manufacturing feasibility through standardized grinding processes.
2Manufacturing precision
If bending roller method is used, then some asymmetric profile effects are achieved, but production stability deteriorates
Solution Approach 1:
The patent applies preliminary action principle by pre-grinding the work roll with a specific asymmetric profile curve before the rolling process. This preliminary preparation of the roll surface ensures that the asymmetric plate profile is compensated throughout production without requiring continuous adjustment or bending roller intervention, thereby maintaining production stability while achieving profile control.
Solution Approach 2:
The patent utilizes curvature principle by designing the work roll profile with specific curvature distribution described by polynomial formulas. The asymmetric curvature profile creates varying contact pressures across the plate width, compensating for asymmetric deflection and profile defects. The curvature is mathematically defined to achieve optimal compensation while maintaining roll structural integrity.
3Manufacturing precision
If non-linear asymmetric roll contour is ground, then plate profile accuracy is improved, but roll manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes principle by using polynomial formulas with adjustable coefficients to define the asymmetric roll profile. The profile is described by mathematical parameters (coefficients of odd-powered terms) that can be optimized and adjusted to achieve different compensation requirements. This parametric approach allows precise control of roll geometry while using standardized grinding equipment, balancing manufacturing precision with equipment complexity.
Data Source
Figure 1~2
AI summary
A compensation method of an asymmetric strip shape of a strip rolling mill, for compensating the asymmetric strip shape of a strip caused in a machining process of the strip rolling mill in the prior art. The compensation method is realized by generating a non-linear asymmetric no-load roll-shaped profile curve through polishing an upper working roll and a lower working roll of a rolling mill and forming a non-linear asymmetric no-load roll gap between a transmission side and a working side of the upper and lower working rolls. The strip rolling mill in the prior art refers to a presently commonly used two-roll rolling mill driven by the transmission side of the working roll, a four-roll rolling mill equipped with a support roll and a multi-roll rolling mill equipped with a middle roll. The present invention is applied to compensate an asymmetric no-load roll gap on the working roll, thus reducing or eliminating an asymmetric strip shape defect caused by a machining process of the strip rolling mill in the prior art and an apparent or potential asymmetric strip shape quality problem of the product caused thereby, and also reducing production stability faults such as off tracking, drifting and pack rolling caused by the asymmetric strip shape in the production process of the strip rolling mill.