Thin Glass Strip Camber Control via Edge Velocity Differential
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Solution Overview
Problem
Thin glass strips often exhibit camber defects during manufacturing, leading to curvature and stress, which complicates subsequent processing steps, especially for ultra-thin glasses used in coiled forms, as existing methods fail to effectively eliminate or minimize these defects.
Innovation Solution
A method and apparatus that utilize a control variable determined by measuring edge length differences at multiple locations along the glass strip, allowing for precise adjustment of drawing velocities to counteract camber defects by modifying the shape modification rate and temperature profile during the hot forming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the glass strip is drawn at high speed to increase productivity, then production efficiency improves, but camber defects increase due to uneven cooling and shape modification rates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the drawing velocity profile during the hot forming process. Specifically, the velocity is modified as a function of the shape modification rate and temperature profile to maintain uniform edge lengths despite high overall production speeds. This resolves the contradiction by allowing high productivity while preventing camber defects through localized velocity optimization.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the shape modification rate and temperature distribution during drawing, then using this information to adjust the drawing velocity in real-time. This closed-loop control ensures that even at high production speeds, the velocity profile adapts to prevent uneven cooling and camber formation, thus maintaining manufacturing precision while achieving high productivity.
2Manufacturing precision
If the edge lengths are made uniform to reduce camber defects, then manufacturing precision improves, but the shape modification rate must be reduced, decreasing productivity
Solution Approach 1:
The patent resolves this contradiction by changing the velocity parameter dynamically during the process. Instead of using a constant reduced velocity, the system adjusts the drawing velocity as a function of position and time, allowing high shape modification rates in regions where they do not compromise edge uniformity, while maintaining lower velocities only where necessary to prevent camber.
Solution Approach 2:
The patent applies dynamics by transitioning from a static, constant velocity approach to a dynamic velocity profile that adapts during the drawing process. The velocity is continuously adjusted based on real-time measurements of shape modification rate and temperature, enabling the system to achieve both high productivity and edge uniformity by optimizing the velocity at each moment rather than constraining it to a fixed low value throughout.
3Manufacturing precision
If measurements are taken at multiple locations to accurately control camber, then manufacturing precision improves, but device complexity increases due to additional measuring and control systems
Solution Approach 1:
The patent applies parameter changes by using measurements from multiple locations to determine a velocity profile that is then applied across the entire glass strip. Rather than independently controlling each measurement point, the system synthesizes a unified velocity parameter function based on all measurements, which simplifies the control architecture while maintaining high manufacturing precision through comprehensive monitoring.
Data Source
AI summary
A method for producing thing glass strips is provided that avoids camber defects. The method includes using a glass strip forming device that has a drawing device; drawing, using the drawing device, the thin glass strip away from the glass strip forming device; measuring, using a measuring device, variables that are dependent on a differing length of edges of the thin glass strip at at least two measurement locations spaced apart transversely to a longitudinal extension of the thin glass strip; determining a difference or a quotient of the variables. The difference or the quotient is used to determine a control variable by which the glass strip forming device is controlled so as to counteract a difference in velocities of the thin glass strip between the two opposite edges.