Steel Sheet Coiling Tension Pattern for Kink and Collapse Prevention
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Solution Overview
Problem
Existing methods for preventing kinking and collapsing of steel sheets during coiling are limited to specific conditions and fail to account for variations in steel sheet composition, thickness, or surface coatings, leading to inconsistent effectiveness.
Innovation Solution
A method of determining a tension pattern for coiling steel sheets using the apparent elastic modulus in the radial direction of the coil, which involves calculating stress distributions to prevent kinking and collapsing by optimizing coiling tension patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coiling tension methods are used, then kinking or collapsing may be prevented under specific conditions, but the methods fail when steel sheet characteristics (composition, thickness, coating) change
Solution Approach 1:
The patent changes the fundamental parameter used for determining coiling tension from empirical rules based on steel sheet specifications to the apparent elastic modulus measured directly from the steel sheet. This allows the tension pattern to adapt to actual material properties regardless of composition, thickness, or coating variations, resolving the contradiction between reliability and adaptability
Solution Approach 2:
The invention enables the steel sheet itself to determine the appropriate coiling tension pattern through measurement of its apparent elastic modulus. Rather than relying on external specifications or assumptions, the material's actual mechanical properties are directly measured and used to calculate the optimal tension pattern, making the system self-adapting to different steel sheet characteristics
2Reliability
If multiple different coiling tension patterns are used for different steel sheet types, then appropriate tension can be applied, but the complexity of determining the correct pattern increases
Solution Approach 1:
The patent replaces complex empirical decision-making systems with a straightforward mechanical measurement approach. Instead of consulting multiple tables or rules based on steel sheet specifications, the apparent elastic modulus is directly measured and used in calculations, simplifying the determination process while maintaining or improving tension application accuracy
Solution Approach 2:
The invention creates a direct physical copy of the steel sheet's mechanical behavior through measurement of its apparent elastic modulus. This measured value serves as a representative parameter that captures the essential mechanical characteristics needed for tension pattern determination, eliminating the need for complex multi-parameter assessments
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 method effectively prevents kinking and collapsing of steel sheets regardless of their characteristics, ensuring consistent coiling performance across different steel sheet types.
Implementation Method 1
calculating the tension pattern using an apparent elastic modulus in a radial direction of a coil
Implementation Method 2
Collapsing is considered to occur because the radial stress between the layers of the coil (i.e. between the steel sheets forming the coil) is insufficient and consequently slippage occurs between the layers without friction
Data Source
AI summary
Provided are methods that can prevent either or both of kinking and collapsing of a steel sheet coiled in coil form regardless of the characteristics of the steel sheet. A method of determining a tension pattern of tension applied to a steel sheet to coil the steel sheet in coil form comprises calculating the tension pattern using an apparent elastic modulus in a radial direction of a coil.