Localized Work Roll Pressure for Metal Substrate Flatness Control
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Solution Overview
Problem
Metal substrates with poor flatness pose processing challenges due to internal stresses, leading to difficulties in high-speed processing, steering issues, and unsatisfactory downstream applications, as current tension-controlled sheet leveling equipment is bulky and inefficient.
Innovation Solution
A method and system that utilize vertically aligned work rolls with localized pressure control zones and actuators to adjust the flatness profile of metal substrates, maintaining overall thickness and length constant while applying texture, using a controller and flatness measuring device to achieve desired flatness without significant thickness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tension-controlled sheet leveling equipment is used to improve flatness, then flatness control is achieved, but the equipment becomes bulky and processing efficiency decreases
Solution Approach 1:
The patent divides the flatness control function into multiple independent actuators (e.g., 7 actuators) that can be individually controlled. Each actuator applies localized pressure to specific regions of the substrate, replacing the need for bulky tension-controlled equipment. This segmentation enables precise flatness adjustment while maintaining a compact system design that preserves processing efficiency.
Solution Approach 2:
The patent implements localized pressure application through multiple actuators positioned at different locations across the substrate width. Each actuator can independently adjust pressure in its specific zone, allowing targeted flatness correction in problem areas without affecting the entire substrate. This local quality approach achieves superior flatness control while using smaller, more efficient equipment compared to global tension control methods.
2Manufacturing precision
If conventional tension leveling is used to achieve flatness, then substrate flatness is improved, but equipment complexity and space requirements increase
Solution Approach 1:
The patent integrates multiple functions into a single compact system: the same actuators that apply localized pressure for flatness control also serve as the primary means for texture application and dimensional control. The work rolls with integrated actuators perform multiple operations (flattening, texturing, thickness control) that would traditionally require separate equipment, thereby reducing overall system complexity and space requirements.
Solution Approach 2:
The patent replaces the complex mechanical tension control system with a more sophisticated but space-efficient actuator-based pressure control system. Instead of using large tensioning devices, pulleys, and mechanical leverage systems, the invention uses controlled actuators (hydraulic, pneumatic, or electric) that can be precisely programmed and controlled electronically, reducing mechanical complexity while improving control precision.
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
This approach effectively controls the flatness of metal substrates with minimal thickness and length changes, improving processing efficiency and substrate quality by reducing localized tension areas, allowing for precise flatness and texture application without bulkier equipment.
Implementation Method 1
applying, by a first work roll of the pair of work rolls, a plurality of localized work roll pressures to the metal substrate across a width of the metal substrate
Implementation Method 2
The localized thickness change required to correct flatness is a tiny fraction of a percentage of nominal thickness, typically less than 0.2%
Data Source
AI summary
A flatness control system includes a work stand of a finishing line, a plurality of actuators, a flatness measuring device, and a controller. The work stand includes a pair of vertically aligned work rolls. A first work roll of the pair of work rolls includes a plurality of flatness control zones configured to apply a localized pressure to a corresponding region on a substrate. Each actuator corresponds with a one of the plurality of flatness control zones. The flatness measuring device is configured to measure an actual flatness profile of the substrate. The controller is configured to adjust the plurality of actuators such that the localized pressures modify the actual flatness profile to achieve the desired flatness profile at the exit of the stand. The thickness and a length of the substrate remain substantially constant when the substrate exits the work stand.