Roll Stand Cassette for Rapid Work Roll Configuration Change
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Solution Overview
Problem
The existing methods for changing roll configurations in roll stands, such as converting from large to small work roll diameters, are costly and require significant changeover efforts, including adjustments to drive trains, bending, and shifting systems, making it inefficient for rolling metals with special alloys and high-strength grades.
Innovation Solution
A method and device that replace work rolls with a replacement set comprising three rolls stored in a common cassette, where the outer geometry of the cassette matches the work roll chocks, allowing for quick installation without further conversion measures, and includes additional support rolls and drive pin adapters for efficient diameter reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If work rolls with large diameter are replaced by work rolls with small diameter using conventional methods, then the rolling mill can process high-strength steels with stringent quality requirements, but the conversion requires significant changeover efforts including adjustments to drive trains, bending systems, and shifting systems
Solution Approach 1:
The replacement set is segmented into a modular cassette containing multiple exchange rolls (at least three rolls) with different diameters. This segmentation allows the rolling mill to switch between different roll configurations by simply changing the cassette, without requiring complex adjustments to drive trains, bending systems, or shifting systems. The cassette acts as a self-contained module that integrates multiple roll options.
Solution Approach 2:
The cassette is designed with universal mounting elements that correspond substantially to standard work roll mounting elements. This universality allows the same cassette structure to accommodate rolls of different diameters and configurations, enabling the rolling mill to process various material types (including high-strength steels) using a single multi-functional replacement set rather than requiring separate conversion procedures for each roll type.
2Productivity
If conventional roll replacement methods are used, then work rolls can be replaced, but the changeover time is extended and operational efficiency is reduced
Solution Approach 1:
Multiple exchange rolls are pre-assembled in the cassette before being installed in the rolling mill. This preliminary action of pre-configuring the replacement set eliminates the need for time-consuming on-site assembly and adjustment operations. The cassette is prepared in advance with all necessary rolls positioned and secured, allowing for rapid installation that minimizes changeover time and maximizes operational efficiency.
3Ease of manufacture
If work rolls are replaced individually, then the replacement can be performed, but wear-related rework and conversion costs increase
Solution Approach 1:
Multiple exchange rolls are merged into a single integrated cassette assembly. This combining approach allows all rolls in the replacement set to be installed and secured simultaneously as one unit, rather than requiring individual replacement operations. The merged cassette structure reduces the cumulative wear and handling damage that would occur with multiple separate installations, thereby reducing wear-related rework and lowering overall conversion costs.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The invention relates to a method for changing a roll configuration in a roll stand having a cassette-type design, wherein: the roll stand comprises at least two work rolls (3); during a configuration change, at least one work roll (2) of the roll stand is replaced with a roll arrangement as a replacement set; the replacement set comprises at least three replacement rolls which are all supported on a common cassette (5) the outer contour of which substantially at least partially corresponds to the respective chocks (4) of the work roll (3) to be exchanged (3). The invention also relates to a roll arrangement in the form of a replacement set for carrying out the method.