Rolling Mill Cylinder Layout for Lower Bearing Offset Loads
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Solution Overview
Problem
Conventional rolling mills face challenges in reducing offset loads on bearings, particularly when the roll shift amount is large, leading to shorter bearing lifetimes due to complex structures requiring numerous bending cylinders and adjustment mechanisms.
Innovation Solution
A rolling mill design with a simplified structure featuring three or more first cylinders applying bending force vertically to the bearing, arranged in a staggered manner on the drive and work sides, and additional second cylinders for backlash elimination, allowing for precise control of bending force distribution to reduce offset loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If multiple bending cylinders and adjustment mechanisms are arranged to reduce offset loads on bearings during large roll shifts, then bearing lifetime is extended, but device complexity increases significantly
Solution Approach 1:
The bearing support structure is divided into multiple segments along the roll axis, with bending cylinders positioned at different axial locations. Each cylinder independently applies bending force to its corresponding bearing segment, allowing distributed load management that reduces offset loads on individual bearings while using a manageable number of components
Solution Approach 2:
Bending cylinders are positioned at specific axial locations corresponding to bearing positions, with each cylinder providing localized bending force adjustment. This local quality approach allows precise control of bending moments at each bearing location without requiring uniform adjustment mechanisms across the entire roll, reducing overall system complexity while extending bearing lifetime
2Device complexity
If the number of bending cylinders and adjustment mechanisms is reduced to simplify the structure, then device complexity decreases, but the ability to control offset loads on bearings during large roll shifts deteriorates
Solution Approach 1:
Each bending cylinder is designed to perform multiple functions: applying bending force to the roll, adjusting bearing load distribution, and compensating for offset loads during roll shifts. This multi-functionality allows a reduced number of components to maintain reliable offset load control, as each cylinder handles both bending and load distribution tasks simultaneously
Solution Approach 2:
The bending cylinders act as intermediary elements between the roll and the bearing support structure, mediating the transmission of forces. By positioning cylinders at strategic locations, they intermediate the load path to ensure even distribution of bending moments across multiple bearings, maintaining reliable offset load control with fewer components
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 design effectively reduces offset loads on bearings even with a simple structure, enhances bending precision, and prevents bearing movement during rolling, thereby extending bearing lifespan and maintaining high bending accuracy.
Implementation Method 1
three or more first cylinders that apply bending force vertically to the bearing to cause the roll to perform bending
Data Source
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AI summary
A rolling mill including: a roll that is shifted in an axial direction; a bearing that is shifted in a roll-axis direction along with the roll, and receives a load from the roll; and three or more first cylinders that apply bending force vertically to the bearing to cause the roll to perform bending, in which the bearing and the first cylinders are provided on each a drive side and an work side of the roll, two first cylinders among the first cylinders are provided in the roll-axis direction on a rolled material 5 entry side or exit side, one first cylinder among the first cylinders is provided on a side that is one of the rolled material 5 exit side and entry side, and that is opposite to a side provided with the two first cylinders, and the first cylinder on the opposite side is positioned between the two first cylinders when viewed in a rolling direction.