Metal Sheet Flatness Control via Optical Telemeters
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Solution Overview
Problem
Current methods for controlling the flatness of metal sheets produced from uncoiled metal sheet webs are manual, time-consuming, and inefficient, leading to production delays and potential damage to machinery due to widespread non-flatness issues.
Innovation Solution
A metal sheet flatness control system that includes a support frame, contactless distance measuring devices (telemeters), and an electronic control unit to automatically and continuously assess the flatness of metal sheets in real-time, allowing for rapid and precise adjustments without halting production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual flatness control using steel rulers is used, then measurement can be performed with simple equipment, but control time increases to several minutes per sheet and productivity decreases
Solution Approach 1:
The patent replaces manual mechanical measurement with an automated optical measurement system. A laser device emits light that reflects off the metal sheet surface, and a detector measures the reflected light to determine surface topography. This substitution of mechanical rulers with optical sensing enables rapid, contactless measurement while maintaining precision, directly resolving the contradiction between measurement capability and productivity.
Solution Approach 2:
The system enables self-service measurement where the metal sheet itself serves as the measurement target without requiring external operators. The automated system continuously measures flatness as sheets pass through the production line, eliminating the need for manual intervention at each measurement point and significantly increasing throughput while maintaining measurement quality.
2Reliability
If manual flatness control is implemented, then resource expenditure is reduced with simple tools, but control coverage remains random and incomplete
Solution Approach 1:
The patent implements continuous flatness measurement throughout the production process. The optical measurement system operates continuously as metal sheets move through the production line, providing uninterrupted monitoring of flatness conditions. This continuous measurement ensures comprehensive quality control coverage without requiring additional resources per sheet, as the system measures all sheets automatically during normal production flow.
Solution Approach 2:
The system performs preliminary flatness assessment before sheets proceed to subsequent processing steps. By measuring flatness early in the production line, the system identifies sheets requiring corrective action before they reach downstream operations, preventing potential machine damage and production delays while minimizing resource expenditure on problematic sheets.
3Productivity
If production continues without flatness control, then productivity is maintained, but machine damage and production delays occur due to non-flat sheets
Solution Approach 1:
The patent implements a feedback control system where flatness measurement results are immediately fed back to control the flattening process. The optical measurement system continuously monitors sheet flatness, and this information is used to adjust flattening roller pressure and positioning in real-time. This closed-loop feedback ensures sheets maintain proper flatness throughout production, preventing machine damage and delays while sustaining continuous production flow.
Solution Approach 2:
The system applies preliminary corrective action to prevent harmful effects before they occur. By continuously monitoring flatness and immediately adjusting the flattening process, the system prevents non-flat sheets from reaching downstream machinery that could be damaged. This proactive approach eliminates production delays caused by sheet rejection while maintaining continuous production throughput.
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
Enables rapid and automatic control of metal sheet flatness, reducing production delays and machine damage by providing continuous, precise flatness assessment and adjustment, ensuring high-quality final products with reduced resource expenditure.
Implementation Method 1
The telemeters are operable to perform a series of distance measurements relative to the metal sheet by optical triangulation
Data Source
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Figure 2
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AI summary
A metal sheet flatness control system to control flatness of metal sheets obtained by flattening and shearing an uncoiled metal sheet web in a production line. The flatness control system comprises a support frame; a measurement apparatus carried by the support frame and comprising one or more telemeters, which can be operated to measure distances relative to metal sheets whose flatness is to be controlled, and output distance data indicative of the distance measurements made; and an electronic control unit connected to the measurement apparatus to control its operation and receive and process the distance data received from each telemeter to compute data indicative of the flatness of the metal sheets. The electronic control unit is also configured to operate each telemeter to make a series of distance measurements relative to a metal sheet; compute at least one flatness index for a metal sheet based on distance data received from each telemeter; compare the flatness index of the metal sheet with at least one threshold; and provide indications on the flatness of the metal sheet based on the outcome of the comparison.