Rolling Mill Roll Gap Control for Rolled Product Stabilization
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Solution Overview
Problem
The rolled product in a rolling mill stand may not remain stable in the desired position during the opening or closing of the roll gap, leading to lateral movement and quality issues due to small irregularities in roll positioning and geometric shape, causing undesirable changes in position and potential production interruptions.
Innovation Solution
A method and device that utilize a location control system with non-contact detectors, such as cameras, to detect the position of the rolled product relative to the roll gap, and adjust the positioning of the working rolls hydraulically to stabilize the product during opening and closing, ensuring it remains at a target position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the roll gap is opened or closed during rolling, then the working rolls can be positioned to allow roll changes or thickness reduction, but the rolled product becomes unstable and moves laterally in the roll gap
Solution Approach 1:
A location control system continuously detects the actual position of the rolled product in the roll gap and provides feedback signals to the positioning device. The positioning device adjusts the working roll position based on this feedback to compensate for lateral movements, thereby maintaining stable rolled product positioning during roll gap opening and closing operations
Solution Approach 2:
A positioning device acts as an intermediary between the roll gap opening/closing mechanism and the rolled product. This positioning device actively adjusts the working roll position to counteract lateral forces on the rolled product, serving as a mediator that maintains stability while allowing roll gap adjustment
2Ease of manufacture
If the rolled product is conveyed through an open rolling mill stand without rolling force, then roll changes can be performed, but the rolled product may run off to the side due to irregularities in roll positioning
Solution Approach 1:
The location control system is activated before and during the roll change process to preliminarily detect and correct any positioning deviations. The system prepares the working rolls in advance to maintain proper positioning even when the roll gap is open, preventing lateral movement before it occurs
Solution Approach 2:
During roll change operations, the location control system continuously monitors the rolled product position and provides real-time feedback to the positioning device, enabling dynamic corrections that maintain positioning reliability even when the rolling mill stand is in an open state for roll changes
3Productivity
If the roll gap is closed to apply rolling force, then thickness reduction is achieved, but small irregularities cause lateral forces that change the position of the rolled product
Solution Approach 1:
The location control system detects lateral position deviations of the rolled product during rolling and provides feedback signals to the positioning device. The positioning device then adjusts the working roll position in real-time to compensate for these deviations, maintaining manufacturing precision while enabling continuous thickness reduction operations
Solution Approach 2:
The positioning device dynamically adjusts the working roll position during the rolling process rather than maintaining a fixed position. This dynamic adjustment capability allows the system to respond to changing conditions and maintain position precision throughout the continuous thickness reduction process
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
Stabilizes the rolled product during roll gap opening and closing, improving production quality and efficiency by minimizing waste and enabling continuous production without interruptions.
Implementation Method 1
at least one of the two working rolls can be moved in the plane perpendicular to the conveying direction... by means of hydraulically positioning one or both working rolls
Implementation Method 2
A position of the rolled product in front of and/or behind the roll gap in the direction transverse to the conveying direction, that is, in the axial direction of the working rolls, is detected
Data Source
AI summary
A rolling mill stand has two working rolls forming a roll gap in which a rolled product transported in a conveying direction can be formed. The positioning of at least one working roll is variable in a plane perpendicular to the conveying direction. The rolling mill is used in a method which comprises: conveying the rolled product through the roll gap in the conveying direction and at the same time opening or closing the rolling mill stand by correspondingly increasing or decreasing the roll gap; during opening or closing of the roll stand, detecting a position of the rolled product in front of and/or behind the roll gap in the direction transverse to the conveying direction; and changing the positioning of the corresponding working roll depending on the detected position, so that the rolled product is stabilized at a target position during opening or closing of the roll stand.