Asymmetric Guide Elements for Parallelogram Plate Rolling
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Solution Overview
Problem
The challenge in plate rolling mills is that rectangular plates often become parallelogram-shaped due to uneven friction, leading to instability and deformation, especially when rolling thin and wide plates, as they may not enter the roll stand with straight edges, causing transverse forces and rotation issues.
Innovation Solution
The method involves using guide elements that are initially positioned symmetrically but adjusted asymmetrically after detecting offset side surfaces during the first rolling pass, ensuring the guide elements are adjusted to prevent further deformation by maintaining contact with one side and creating a tolerance gap to prevent sticking, thereby stabilizing the plate's entry into the roll stand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If guide elements are positioned symmetrically at a distance from the plate, then the plate can be centered, but the plate rotates and becomes unstable when entering the roll stand
Solution Approach 1:
The guide elements are positioned asymmetrically relative to the plate width, with the first guide element closer to the first side surface and the second guide element closer to the second side surface. This asymmetric positioning compensates for the plate's tendency to rotate during entry, allowing the plate to enter the roll stand straight despite having a parallelogram shape, thereby maintaining manufacturing precision while preserving stability
Solution Approach 2:
The method detects whether the plate has a parallelogram shape before it enters the roll stand and pre-adjusts the guide element positions accordingly. This preliminary action of detecting and adjusting guide element positions prevents the plate from rotating during entry, ensuring stable and precise rolling from the outset
2Manufacturing precision
If guide elements are driven close to the plate side surfaces, then the plate guidance is improved, but the wider plate ends get stuck in the side guide
Solution Approach 1:
The guide element positions are made dynamically adjustable rather than fixed. The system can change the position of guide elements between rolling passes, allowing them to be closer to the plate for improved guidance accuracy when needed, and adjusted to accommodate varying plate widths and shapes to prevent getting stuck
Solution Approach 2:
The distance between guide elements and plate side surfaces is changed as a variable parameter based on plate conditions. By detecting the plate shape and adjusting the guide element positions accordingly, the system optimizes the balance between guidance accuracy and smooth passage, preventing plate ends from getting stuck while maintaining precise guidance
3Manufacturing precision
If plates with width greater than length are pushed into the roll gap at excessive speed, then they are straightened, but production efficiency is reduced
Solution Approach 1:
The mechanical method of pushing plates at excessive speed to straighten them is replaced with a control system that detects plate shape and adjusts guide element positions. This substitution eliminates the need for excessive speed pushing while achieving the same straightening effect, thereby maintaining production efficiency
Solution Approach 2:
The system incorporates detection of plate shape (whether side surfaces are offset) and uses this feedback to adjust guide element positions accordingly. This closed-loop control achieves plate straightening through intelligent guidance rather than brute force, maintaining both precision and productivity
Data Source
Figure 1~2
Figure 3~5
AI summary
Trouble-free operation of an installation for rolling plates (4) or sheets that have lost their rectangular form and have the form of a parallelogram is ensured by preventing the plate (4) from meandering as it enters a rolling stand (2). A first rolling pass is carried out and, when the plate runs out from the rolling stand, it is determined whether the side faces (12, 14) of the plate (4) are offset in relation to one another in the rolling direction. If the side faces (12, 14) of the plate (4) are offset in relation to one another in the rolling direction (6), i.e. if the plate (4) is parallelogram-shaped and has an oblique end, in a second rolling pass guiding elements (12, 14) of the rolling stand (2) are set asymmetrically with respect to a centre line (M). A first guiding element (18) for the side face (14), which is the first to enter the rolling stand (2) in the second rolling pass, is thereby adjusted further away from the centre line (M) than the second guiding element (16).