Roll Bender Pressure Control for Tail End Buckling Suppression
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Solution Overview
Problem
Existing methods for preventing buckling accidents in rolling mills, such as those caused by meandering, are complex and not always effective, leading to quality failures due to material scratches and defects.
Innovation Solution
A tail end buckling suppression device that uses roll bender devices to control the material to pass through the center of the rolling line by continuously lowering the roll bender pressure of subsequent stands after the material exits a designated stand, using designated stand information to select appropriate control points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complicated calculation-based control methods are used to prevent meandering, then meandering prevention capability is improved, but control system complexity increases
Solution Approach 1:
The invention changes the control parameter from complex calculations involving torque difference and parallelism stiffness to a simple roll bender pressure parameter. By continuously lowering the roll bender pressure during the period after the tail end passes through a designated stand, the system achieves meandering prevention through a single controllable parameter rather than complex multi-parameter calculations.
Solution Approach 2:
The invention applies different roll bender pressure control strategies to different sections of the rolling line. Specifically, it targets the section downstream of a designated stand (where 1≤j≤N−1) and applies continuous pressure reduction only in this local region, rather than uniformly controlling the entire rolling line, thereby simplifying the overall control system while maintaining effectiveness.
2Manufacturing precision
If roll bender pressure is continuously lowered to prevent buckling, then material centering is improved, but roll bender pressure stability deteriorates
Solution Approach 1:
The invention applies periodic control to the roll bender pressure by implementing continuous pressure reduction only during a specific period (after the tail end passes through the designated stand until it exits the final stand), rather than maintaining constant pressure throughout. This time-dependent periodic action achieves material centering while managing pressure stability through controlled temporal variation.
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 device effectively suppresses meandering and tail end buckling by shaping the material to pass through the center, preventing quality defects and ensuring stable rolling operations.
Implementation Method 1
Each i-th rolling stand (1≤i≤N) of the tandem rolling mill includes an i-th roll bender device configured to screw down the material to be rolled with preset roll bender pressure
Data Source
AI summary
The present disclosure relates to a tail end buckling suppression device for a tandem rolling mill rolling a material to be rolled by N (N≥2) successive rolling stands. Each i-th rolling stand (1≤i≤N) of the tandem rolling mill includes an i-th roll bender device screwing down the material to be rolled with preset roll bender pressure. During a period after a tail end of the material to be rolled comes out of one designated j-th rolling stand (1≤j≤N−1) until the tail end of the material to be rolled comes out of the N-th rolling stand, the tail end buckling suppression device causes each of j+1-th to N-th roll bender devices downstream of the j-th rolling stand to continuously lower the roll bender pressure.