Rolling Stand Bending and Shifting System Under Load
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Solution Overview
Problem
Existing rolling stands face challenges in maintaining a large rolling gap between working rolls, leading to uneven wear, deformation, and surface defects due to high reaction forces and inadequate compensation mechanisms, particularly when rolling large thicknesses.
Innovation Solution
A rolling stand with a combined bending and shifting device system, featuring sliding couplings and actuators that allow parallel shifting of rolls under load, ensuring optimal contact and guiding of chocks to prevent undesired bending forces and maintain axial parallelism, thus compensating for roll deformation and extending roll life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a large rolling gap is maintained between working rolls, then large thicknesses can be rolled, but high reaction forces cause roll deformation and lenticular shape
Solution Approach 1:
The patent applies preliminary anti-action by using bending devices that pre-load the rolls in the opposite direction of expected deformation. The bending load is applied to the chocks before rolling occurs, creating a counter-deformation that compensates for the lenticular shape that would otherwise develop under rolling pressure.
Solution Approach 2:
The patent changes the physical parameters of the roll system by applying controlled bending loads to modify the roll geometry. The bending devices adjust the roll curvature and shape parameters dynamically, transforming the rolls from a straight configuration to a pre-curved configuration that anticipates and counteracts the deformation caused by large gap rolling forces.
2Shape
If bending devices are added to compensate for roll deformation, then roll shape control improves, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing a unified chock structure that simultaneously supports roll positioning, applies bending loads, and enables roll shifting. The bending devices are integrated into the existing chock-rolling stand interface, allowing the same structural elements to perform multiple functions: supporting the roll weight, applying compensating bending moments, and facilitating axial displacement for wear distribution.
Solution Approach 2:
The patent merges the bending function with the existing roll support and positioning system. The bending devices are combined with the chocks and sliding couplings that already exist in the rolling stand, creating an integrated system where structural elements serve dual purposes: mechanical support and active deformation compensation.
3Volume of moving object
If rolling stands are designed for large openings, then thick materials can be processed, but uneven wear and surface defects increase
Solution Approach 1:
The patent applies preliminary action by pre-shifting the rolls axially before the rolling operation begins. The sliding couplings enable the rolls to be displaced in the axial direction during idle time or between passes, distributing the contact wear across different surface areas of the rolls. This preliminary positioning prevents concentrated wear at single contact points that would lead to grooves and surface defects.
Solution Approach 2:
The patent introduces dynamics by making the roll positioning adjustable during operation. The sliding couplings allow the rolls to move axially dynamically, changing the contact pattern on the roll surfaces. This dynamic repositioning ensures that no single area of the roll bears excessive wear, maintaining surface integrity and product quality throughout extended operation periods.
4Shape
If chocks are moved closer together under load, then roll deformation compensation improves, but axial misalignment and bending moments on shifting devices increase
Solution Approach 1:
The patent introduces an intermediary element - the sliding coupling - that mediates between the chock movement and the roll positioning. The sliding coupling acts as a buffer that allows chocks to move closer together for deformation compensation while maintaining proper axial alignment through its constrained motion paths. This intermediary mechanism decouples the bending function from potential misalignment issues.
Solution Approach 2:
The sliding coupling design allows the system to self-correct alignment issues through its geometric constraints. As the chocks move under load, the sliding coupling's track geometry automatically guides the motion to maintain axial parallelism, eliminating the need for external alignment mechanisms or complex control systems.
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 enables efficient shifting and bending under load without risking actuator or block damage, maintaining roll parallelism and reducing wear, thereby improving the quality and longevity of rolled products, especially when handling large rolling gaps and thick materials.
Implementation Method 1
The sliding coupling allows the chock to perform a shifting movement in the vertical direction
Data Source
AI summary
A rolling stand with a bending and shifting device for rolling rolls with two lower blocks fixed to the housing and carrying a lower chock, two upper blocks connected to an upper chock, a shifting device for the upper roll connected to the upper chock via a sliding coupling, a shifting device for the lower working roll connected to the lower chock via a sliding coupling. The lower chock is coupled to the blocks via a sliding coupling which allows the chock to be moved in a vertical direction to generate a bending of the lower roll via actuators. The two upper blocks are vertically coupled with the housing to allow the upper roll to be bent. The shifting movement of the upper roll is achieved via a sliding coupling between the upper chock and the two upper blocks, and may be carried out under load when rolling operations occur.