Work Roll Bending Layout for High-Lift Rolling Gap Adjustment
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Solution Overview
Problem
Existing rolling devices face challenges in achieving high roll lift while avoiding undesirable interactions with the backup roll balancer, which requires stronger components to absorb high forces and complicates maintenance and roll gap contour adjustment.
Innovation Solution
A rolling device with a structurally and spatially separate upper work roll bending device, featuring vertically fixed bending cylinders and bending arms that interact with work roll chocks, allowing for high roll lift and independent adjustment of the rolling gap without affecting the backup roll balancer, enabling easy maintenance and precise roll gap control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the upper bending cylinders are actuated to influence the rolling gap contour, then the rolling gap contour can be adjusted, but interactions with the upper backup roll balancer occur and require much stronger components
Solution Approach 1:
The invention extracts the bending device for the upper work roll from the backup roll balancer system by providing separate bending cylinders (15) that are vertically fixed and act directly on the upper work roll (4) through bending arms (16), independent of the backup roll balancer (33). This separation eliminates the interaction problem while maintaining rolling gap contour adjustment capability.
2Reliability
If the components arranged in the force flow with the upper backup roll-balancer are designed to absorb relatively high forces, then no negative effects occur on the roll gap contour, but the device complexity and component size increase
Solution Approach 1:
The bending device is extracted from the force flow of the backup roll balancer system. The bending cylinders (15) are vertically fixed and connected directly to the upper work roll (4) through bending arms (16), creating an independent force path that does not involve the backup roll balancer (33). This eliminates the need for oversized components while maintaining reliability.
3Length of moving object
If a very high roll lift of up to about 1100 mm is realized, then the rolling device provides work roll-axial displacement capability, but the structural separation and accessibility for maintenance are compromised
Solution Approach 1:
The invention segments the bending device into vertically fixed bending cylinders (15) positioned above the stand window and bending arms (16) that extend down to the upper work roll (4). This segmentation allows the cylinders to be easily accessible for maintenance while the arms provide the necessary mechanical linkage for high roll lift capability.
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 a high roll lift of up to 1350 mm with improved guidance of work roll chocks and decoupling from the backup roll balancer, simplifying maintenance and ensuring precise roll gap adjustment, thus enhancing operational efficiency and accessibility.
Implementation Method 1
The bending cylinders for the lower work roll are arranged vertically in stationary blocks. The bending device for the upper work roll is characterized by bending arms that can be moved vertically in guides on the housing. The bending cylinders are guided within the window of the housing below its crosshead on balancer arms of the upper backup roll via crossbars on balancer arms. A vertical force is applied to the chocks of the upper work roll via the bending arms, which are hooked into the crossbars.
Implementation Method 2
EP 2 342 026 B 1 describes a rolling device with work roll bending and balancing cylinders. The bending cylinders for the lower work roll are arranged vertically in stationary blocks. The bending device for the upper work roll is characterized by bending arms that can be moved vertically in guides on the housing.
Data Source
AI summary
A rolling device has an upper and a lower work roll and at least one upper and one lower backup roll. The work rolls and the backup rolls are supported on a common rolling mill stand. The work rolls can be adjusted relative to each other in order to adjust a specified rolling gap. Each of the work rolls is operatively connected to at least one bending device. At least one first bending device is paired with die upper work roll, and at least one second bending device is paired with the lower work roll. The second bending device comprises bending cylinders which are arranged in a vertically fixed manner. The upper work roll can be readjusted or carried by the first bending device, thereby vertically adjusting die height of the rolling gap. The first bending device comprises bending arms that interact with bending cylinders arranged in a stationary manner.