Rolling Mill Stand Movable Rails for In-Line Work Roll Exchange
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Solution Overview
Problem
Existing rolling mill stands face challenges in efficiently replacing work rolls while maintaining continuous operation, as existing solutions require interrupting the rolling process and can be cumbersome due to varying kinematic configurations and structural modifications, leading to inefficiencies and safety concerns.
Innovation Solution
The implementation of a rolling mill stand design featuring movable rails that can be independently positioned between idle and service positions, allowing for the withdrawal and insertion of work rolls without interrupting the rolling process, and a method for controlling the work roll bending cylinders to separate and reposition the rolls for safe and efficient replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If work rolls are removed and replaced using fixed rails and conventional procedures, then the work roll assembly can be changed, but the rolling process must be interrupted and the procedure is time-consuming
Solution Approach 1:
The patent applies the dynamics principle by making the rails movable instead of fixed. The movable rails can be positioned to either block or clear the path of work roll movement, enabling rapid replacement without interrupting the rolling process. This dynamic configuration allows the system to adapt between operational and replacement modes, significantly reducing downtime.
Solution Approach 2:
The patent implements preliminary action by pre-positioning the movable rails in a configuration that facilitates quick work roll replacement. The rails are designed to be movable to a replacement position that clears the path for work roll insertion and removal, so that when replacement is needed, the infrastructure is already prepared to enable rapid exchange without process interruption.
2Productivity
If movable rails are added to enable work roll replacement without interrupting the rolling process, then productivity improves, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the rail system into separate movable and fixed components. Each movable rail can be independently controlled and positioned, allowing the system to achieve complex functionality through simple, modular elements. This segmentation reduces overall system complexity while enabling continuous operation during work roll replacement.
Solution Approach 2:
The movable rails serve multiple functions: they guide work rolls during normal operation, clear the path during replacement operations, and can be repositioned to accommodate different work roll sizes. This multi-functionality reduces the need for separate specialized components, thereby reducing device complexity while maintaining high productivity.
3Productivity
If the rolling process is interrupted to replace work rolls, then safety can be maintained, but productivity decreases
Solution Approach 1:
The movable rails act as an intermediary mechanism that enables safe work roll replacement without requiring process interruption. The rails provide a controlled path for work roll insertion and removal, allowing operators to perform replacements safely while the rolling process continues uninterrupted, thus maintaining both productivity and safety.
4Productivity
If conventional fixed rail systems are used, then the structure remains simple and compact, but work roll replacement requires process interruption
Solution Approach 1:
The patent transforms the static fixed rail system into a dynamic movable rail system. The rails can be repositioned between operational and replacement configurations, enabling work roll replacement without process interruption. This dynamic capability significantly improves replacement efficiency while adding only minimal structural complexity.
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 solution enables rapid and efficient replacement of work rolls without interrupting the rolling process, reducing downtime, improving operator safety, and maintaining compactness, thus enhancing productivity and adaptability to different rolling mill configurations.
Implementation Method 1
each of the bending wings comprising at least one transportation element, each of the bending wings of the upper work roll chock being slidingly received in a respective one of the opposing upper channel formations
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
A rolling mill stand (400) for rolling a metallic product (P') comprises, inter alia: first and second movable rails (414, 416) arranged to allow unimpeded movement of work roll chocks (506, 508) of upper and lower work rolls (502, 504) when in an idle position during rolling operations, and replacement of the upper and lower work rolls (502; 504) when in a service position. Methods are provided for moving the first and second movable rails (414, 416) between the idle position and the service position in order to replace the upper and lower work rolls (502, 504).