Rolling Mill Roll Tilting for Plate Alignment
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Solution Overview
Problem
When rolling metal plates without exit-side tension, elongation differences between the ends lead to tip end bending, causing the metal plate to deviate from the conveying direction, which can prevent proper winding by the winding device.
Innovation Solution
A method involving detection of plate end positions on both sides of the rolling mill, followed by controlled tilting of the mill rolls to align the metal plate's exit direction with the conveying direction, and subsequent adjustments to correct any deviations and ensure proper alignment for winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rolling is performed without exit-side tension applied to the metal plate, then productivity is improved by enabling tip end tension-free rolling, but tip end bending occurs causing the metal plate to deviate from the conveying direction
Solution Approach 1:
The patent employs a plate end position detector to continuously monitor the position of the plate end in the plate width direction. The detected position information is fed back to the control unit, which automatically adjusts the mill roll tilt angle to correct any deviation from the conveying direction, thereby maintaining manufacturing precision while enabling tension-free rolling
Solution Approach 2:
The control unit dynamically changes the tilt angle parameter of the mill rolls based on the detected plate end position. By adjusting the mill roll tilt angle in real-time, the system corrects tip end bending and maintains proper plate alignment without requiring exit-side tension
2Manufacturing precision
If a plate end position detector is installed on the exit side to correct plate end position deviation, then manufacturing precision is improved by aligning the plate end position, but the system cannot correct tip end bending where the direction of the tip end portion is turned
Solution Approach 1:
The patent applies an excessive action by intentionally tilting the mill rolls beyond just correcting the plate end position. The control unit tilts the mill rolls in the opposite direction to the plate end position deviation, creating a compensatory effect that corrects both the plate end position and the tip end bending direction, thereby enhancing the system's adaptability
Data Source
AI summary
A method for operating a rolling mill device including a pair of mill rolls disposed on opposite sides of a metal plate includes: a detection step of detecting a plate end position in a plate width direction of the metal plate at a position on an exit side of the pair of mill rolls while rolling the metal plate by the pair of mill rolls in a state where an exit-side tension applied to the metal plate is zero; a first tilting step of performing, when a detection result of the plate end position in the detection step is deviated from a reference position to one side in the plate width direction, a roll tilting control of the pair of mill rolls so that an outgoing direction of the metal plate from the mill rolls is along a conveying direction of the metal plate in the rolling mill device; and a second tilting step of performing a roll tilting control of the pair of mill rolls after the first tilting step so that the outgoing direction of the metal plate from the mill rolls is displaced to the other side in the plate width direction with respect to the conveying direction, and then the outgoing direction of the metal plate returns to the conveying direction.