Variable Diameter Compression Roller for Steel Strip Curvature Control
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Solution Overview
Problem
The rolling bending process for steel strips faces challenges in maintaining consistent curvature due to variations in yield stress, leading to inconsistent deformation and curvature in the final product.
Innovation Solution
A rolling bending method and apparatus that utilize a compression roller with a first contact portion and a second contact portion, where the second contact portion extends from the first contact portion in an axial direction, generating a stress greater than the yield stress of the steel strip to elongate one periphery portion more than the other, ensuring consistent deformation and curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional rolling bending process is used with a uniform compression roller, then the process is simple and easy to manufacture, but the curvature of the steel strip varies due to material yield stress variations
Solution Approach 1:
The compression roller is designed with a variable outer diameter profile, where different axial positions have different diameters. This creates localized compression zones with different contact pressures, allowing each region of the steel strip to undergo appropriate deformation that compensates for material property variations, thereby achieving consistent curvature throughout the strip.
Solution Approach 2:
The compression roller employs an asymmetric diameter profile rather than a uniform circular cross-section. This asymmetric geometry creates intentional non-uniform compression distribution across the steel strip width, which counteracts the non-uniform material response caused by yield stress variations, resulting in uniform bending curvature.
2Manufacturing precision
If a uniform compression roller is used, then the device complexity is low, but wrinkles occur and deformation is uneven across the steel strip
Solution Approach 1:
The compression roller features locally varied diameter along its axial length, creating zones of different compression intensity. This local quality variation ensures that areas prone to wrinkling receive appropriate compression control, while other areas receive sufficient deformation, achieving uniform deformation across the entire steel strip without wrinkle formation.
3Manufacturing precision
If the compression roller has a variable outer diameter, then consistent curvature is achieved despite material variations, but the manufacturing complexity of the roller increases
Solution Approach 1:
The compression roller is designed with controlled variations in its outer diameter parameter along the axial direction. By systematically changing this geometric parameter, the roller creates a predetermined compression distribution that compensates for material property variations, achieving consistent curvature control while the roller itself can be manufactured using standard precision machining techniques.
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 solution maintains a constant curvature and reduces wrinkles by balancing deformation across the steel strip, even with varying yield stress, ensuring stable and uniform rolling bending results.
Implementation Method 1
compressing, in a rolling process, the steel strip by using the driving roller and the compression roller to generate a stress greater than a yield stress in the steel strip to elongate one periphery portion of the steel strip more than an other periphery portion
Data Source
AI summary
A steel strip is fed and compressed between a driving roller and a compression roller to generate a stress greater than a yield stress in the steel strip and to elongate one periphery portion of the steel strip, which is on one side, more than the other periphery portion of the steel strip, which is on the other side, in a sending direction. The compression roller includes a first contact portion and a second contact portion. The second contact portion extends from an end of the first contact portion in the axial direction of the compression roller. The end of the first contact portion has an outer diameter less than an outer diameter of the second contact portion.