Segmented Guide Blocks for Axially Shiftable Work Rolls
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Solution Overview
Problem
Existing bending and balancing devices for axially displaceable work rolls in roll stands face limitations in achieving a larger work roll gap while maintaining maximum guidance of the work roll chocks, particularly in applications with significant rolling force fluctuations.
Innovation Solution
The solution involves dividing the previous one-piece stationary guide block into an upper movable and a lower stationary or movable guide block, with a bending and balancing cylinder acting on both the upper and lower work rolls, and using displacement devices for axial displacement, allowing for increased flexibility and adjustment range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-piece stationary guide block is used, then the guidance of work roll chocks is reliable, but the work roll gap cannot be enlarged
Solution Approach 1:
The one-piece stationary guide block is divided into an upper movable guide block and a lower stationary guide block. The upper guide block can move vertically to accommodate larger work roll gaps while the lower guide block remains stationary to provide stable guidance, thus resolving the contradiction between reliability and adaptability.
2Reliability
If the stroke of bending/balancing cylinders is limited, then adequate guidance of work roll chocks is ensured, but the work roll gap cannot be increased
Solution Approach 1:
The upper guide block is made movable rather than stationary, allowing it to dynamically adjust its position vertically. This enables the system to accommodate larger work roll gaps without requiring increased cylinder stroke, maintaining reliable chock guidance while adapting to variable gap requirements.
3Manufacturing precision
If multiple bending and balancing cylinders are used for positive and negative bending, then control precision is improved, but device complexity increases
Solution Approach 1:
A single bending and balancing cylinder is designed to perform both positive and negative bending functions by acting on both the upper and lower work rolls simultaneously. This multi-functional approach reduces the number of cylinders needed while maintaining precise control over work roll deflection.
Data Source
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AI summary
The invention relates to a bending and balancing device for axially shiftable work rolls (10, 10') of a rolling mill, especially of a four-high rolling mill, guide blocks (2) being provided at both sides in the window of every mill housing (1) on the level of the work roll inserts (3, 3') and the force of bending and balancing cylinders (5) being transmissible onto the work roll inserts that are guided in the axial direction and so as to be shiftable in the vertical direction. The guide blocks are subdivided into respective upper and lower guide blocks (2, 2'), the upper guide blocks (2) are mounted in the mill housing window so as to be vertically shiftable, the lower guide blocks (2') are mounted in the mill housing window so as to be fixed or so as to be vertically shiftable, and a bending and balancing cylinder (5) is arranged in every of the associated upper and lower guide blocks and is guided by the same and engages with the upper and the lower work roll insert.