Rolling Mill Chock Positioning for Thrust-Free Load Balance
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Solution Overview
Problem
Existing rolling mill technologies face challenges in accurately measuring and controlling thrust forces between rolls, leading to inaccuracies in reduction leveling and zigzagging control due to changes in rolling conditions, vibration, and varying coefficients of friction, which result in asymmetric deformation and errors in thrust force identification.
Innovation Solution
A rolling mill with a load detection apparatus and position control unit that adjusts roll chock positions based on vertical roll load differences between the work side and drive side, using a reference roll to maintain a predetermined load balance and eliminate inter-roll thrust forces before rolling, thereby stabilizing the rolling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thrust force measurement is performed directly between rolls, then measurement precision is improved, but device complexity increases and measurement becomes difficult due to inaccessibility
Solution Approach 1:
The patent introduces an intermediary approach by measuring thrust counterforce through the backup roll chock instead of directly measuring thrust force between work rolls. The load detection apparatus measures the reaction force on the backup roll chock, which indirectly reflects the thrust force magnitude, thereby solving the measurement accessibility problem while maintaining measurement precision
Solution Approach 2:
The patent replaces direct mechanical thrust force measurement with an indirect load measurement system. By using a load detection apparatus to measure vertical load on the backup roll chock and calculating thrust force through force analysis, the system substitutes complex direct thrust measurement with a more feasible load measurement approach
2Ease of operation
If reduction position adjustment is performed based on thrust counterforce or inter-roll cross angle, then zigzagging control is improved, but manufacturing precision deteriorates due to changes in rolling conditions and friction coefficient variations
Solution Approach 1:
The patent performs preliminary measurement of vertical roll load difference before rolling operation to determine the optimal reduction position. By measuring the load difference in advance and calculating the thrust force, the system establishes the reduction position zero point beforehand, avoiding the need for continuous adjustments during rolling and thereby maintaining manufacturing precision
Solution Approach 2:
The patent implements a feedback mechanism where the measured vertical roll load difference is used to calculate thrust force, which then feeds back to determine the reduction position adjustment. This closed-loop approach compensates for variations in rolling conditions and friction coefficients, maintaining both ease of operation and manufacturing precision
3Manufacturing precision
If roll chock positions are adjusted to eliminate thrust forces, then manufacturing precision is improved, but device complexity increases due to additional position control requirements
Solution Approach 1:
The patent merges the thrust force elimination function with the existing roll position adjustment mechanism. By utilizing the existing roll chock position adjustment capability and integrating it with the load detection and thrust force calculation system, the patent achieves thrust force elimination without requiring entirely new positioning devices, thereby improving manufacturing precision while limiting the increase in device complexity
Data Source
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Figure 3A
AI summary
There is provided a rolling mill of four-high or more that includes a plurality of rolls including at least a pair of work rolls and a pair of backup rolls supporting the work rolls, in which any one roll among respective rolls arranged in a vertical direction is adopted as a reference roll, including a load detection apparatus which, at a rolling support point position on a work side and a drive side of the backup rolls, detects a vertical roll load that acts in the vertical direction of the rolls; a pressing apparatus which, with respect to at least roll chocks of the rolls other than the reference roll, is provided on either one of an entrance side and an exit side in a rolling direction, the pressing apparatus pressing the roll chocks in the rolling direction; a driving apparatus which, with respect to at least roll chocks of the rolls other than the reference roll, is provided so as to face the pressing apparatus in the rolling direction, the driving apparatus moving the roll chocks in the rolling direction; and a position control unit which fixes a rolling direction position of roll chocks of the reference roll as a reference position, and drives the driving apparatus to control positions in the rolling direction of the roll chocks of the rolls other than the reference roll.