Work Roll Cooling Plate Geometry for Turbulent Water Cushion Control
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Solution Overview
Problem
Existing cooling systems for work rolls in hot rolling are inflexible and fail to maintain an optimal turbulent coolant cushion for varying work roll diameters, leading to reduced cooling performance and surface defects in the rolled product.
Innovation Solution
A removable concave plate is placed between the water pillow cooling device and the work roll, maintaining a consistent gap of 5 to 200 mm and increasing towards the backup roll, allowing the formation of a turbulent coolant cushion for various work roll diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the work roll diameter is reduced due to grinding, then the work roll surface quality is improved, but the gap between the cooling device and work roll increases beyond optimal range
Solution Approach 1:
The cooling device is segmented into a fixed outer structure and a removable inner plate. This plate can be detached and replaced with different thicknesses to compensate for work roll diameter changes, allowing the gap to be maintained within the optimal 5-200mm range despite grinding-induced diameter reductions.
Solution Approach 2:
The invention changes the physical parameter of the cooling device structure by introducing a removable plate with variable thickness. This allows dynamic adjustment of the effective cooling surface position, maintaining the optimal gap parameter (5-200mm) regardless of work roll diameter variations caused by grinding.
2Device complexity
If a fixed cooling device structure is used, then the device complexity is reduced, but the adaptability to different work roll diameters is lost
Solution Approach 1:
The cooling device is divided into a permanent fixed structure and a removable adjustable plate. This segmentation allows the main structure to remain simple while the removable plate provides adaptability through easy replacement with different thicknesses, achieving both low complexity and high versatility.
Solution Approach 2:
The cooling device incorporates a dynamic element in the form of a removable plate that can be easily installed or removed. This provides adaptability to different work roll diameters without requiring complex adjustable mechanisms, maintaining structural simplicity while enabling flexibility.
3Area of stationary object
If the gap between cooling device and work roll is too large, then the cooling coverage is improved, but the turbulent state of the water cushion is lost
Solution Approach 1:
By precisely controlling the removable plate thickness, the gap is maintained within the optimal 5-200mm range. This parameter control ensures the gap is large enough for adequate cooling coverage but small enough to sustain the turbulent water cushion state necessary for effective heat transfer.
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
Enhances cooling flexibility and performance across different work roll diameters, preventing defects and maintaining surface quality by ensuring a turbulent coolant cushion.
Implementation Method 1
a water pillow cooling device (4, 4') comprising a plurality of nozzles able to spray cooling jets (5) under pressure on at least one of said work roll
Implementation Method 2
When in use, such a system permits to create a liquid cushion, between the nozzles and the work roll, having a highly turbulent state and thus improving the cooling of the work roll
Implementation Method 3
the removable plate is concave and with a curvature such that a gap between the removable plate and the work roll is constant or increases when moving in direction of the back-up roll and such that the gap is from 5 to 200 mm
Data Source
AI summary
A rolling stand for metallic products including at least one pair of work rolls, at least a pair of back-up rolls, at least one water pillow cooling device able to project a plurality of cooling jets under pressure on at least one of said work roll, a removable plate. The removable plate is placed between said cooling device and said work roll. The removable plate is concave and curved with a curvature such that a gap between said removable plate and said upper work roll is constant or increases when moving in direction of the back-up roll and such that said gap is from 5 to 200 mm. The removable plate is also holed such that the cooling jets can pass through said removable plate.