Trimming Knife Position Sensing for Accurate Overlap and Gap Control
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Solution Overview
Problem
Existing trimming devices for steel strips struggle to precisely control the overlap and gap distances between trimming knives during the trimming process, leading to issues such as excessive forces, stress, friction, and wear, which negatively impact edge quality, productivity, and device lifespan.
Innovation Solution
A trimming device equipped with distance sensors and computing means to measure and compute the overlap and gap distances online, allowing for real-time adjustment and wear assessment, while also accounting for shaft bending to provide reliable measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the overlap distance is increased to ensure proper trimming, then the trimming quality improves, but excessive forces and friction are generated leading to accelerated wear of the trimming knives
Solution Approach 1:
The patent implements online measurement of overlap and gap distances using sensors during the trimming process. This feedback system allows real-time monitoring and adjustment of knife positions, enabling optimization of the overlap distance to achieve quality trimming while minimizing excessive forces and wear on the trimming knives.
Solution Approach 2:
The patent enables dynamic adjustment of trimming parameters (overlap and gap distances) based on real-time measurements and steel grade requirements. By changing these parameters online rather than using fixed offline calibration, the system can optimize the overlap distance for each specific trimming operation, preventing excessive forces and extending knife lifespan.
2Manufacturing precision
If the gap distance is adjusted to improve trimming performance, then the trimming quality improves, but improper gap settings cause excessive forces and stress on the trimming knives
Solution Approach 1:
The patent uses online sensors to measure the actual gap distance between trimming knives during operation. This feedback enables real-time detection and adjustment of gap settings, ensuring optimal gap distance for each trimming operation and preventing excessive stress on the knives that would occur with improper gap settings.
Solution Approach 2:
The system allows dynamic adjustment of the gap parameter based on real-time measurements and specific trimming requirements. By changing the gap distance online rather than relying on fixed offline calibration, the system optimizes stress distribution on the trimming knives while maintaining high edge quality.
3Device complexity
If offline calibration is used to set overlap and gap distances, then the device complexity is reduced, but the measurement precision and control efficiency deteriorate
Solution Approach 1:
The patent replaces manual offline calibration with an automated online measurement system using sensors (such as laser sensors or capacitive sensors) to detect the actual positions of the trimming knives. This substitution of mechanical calibration with sensor-based measurement significantly improves measurement precision while providing real-time data for control optimization.
Solution Approach 2:
The system enables self-measurement and self-adjustment of overlap and gap distances through integrated sensors and computing means. The trimming device automatically measures its own parameters online and can adjust accordingly, eliminating the need for complex external calibration equipment while improving measurement accuracy.
4Device complexity
If shaft position sensors are used to measure overlap as in prior art, then the measurement system is simplified, but measurement accuracy deteriorates due to shaft bending
Solution Approach 1:
The patent extracts the measurement function from the shaft position detection method and implements it directly at the knife level using dedicated sensors. By measuring the actual knife positions rather than inferring from shaft positions, the system eliminates the error source caused by shaft bending while maintaining relatively simple device architecture.
Solution Approach 2:
The patent introduces intermediate measurement elements (sensors positioned to directly measure knife overlap and gap) that mediate between the shaft positioning mechanism and the final measurement. This intermediary measurement approach bypasses the shaft bending issue by directly detecting the actual knife positions rather than relying on shaft position inference.
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
This solution enables precise control of the trimming process, improving edge quality, productivity, and extending device lifespan by accurately measuring and adjusting overlap and gap distances, and detecting wear in real-time, thus enhancing the overall efficiency and reliability of the trimming operation.
Implementation Method 1
a first distance sensor (14), able to measure a vertical distance (V1) to the upper end of said upper knife
Implementation Method 2
a second distance sensor (15), able to measure a vertical distance (V2) to the lower end of said lower knife
Data Source
AI summary
A trimming device for metallic sheets including: an upper knife, comprising a central circular face having a diameter D1 and a thickness T1, mounted on an upper shaft, a lower knife, comprising a central circular face having a diameter D2 and a thickness T2, mounted on a lower shaft, wherein said upper knife and said lower knife are vertically shifted with an overlap (DOVERLAP) so as to define a shear of said metallic sheet and wherein at least one of said upper or lower shaft is able to be moved vertically, a first distance sensor, able to measure a vertical distance to the upper end of said upper knife, a second distance sensor, able to measure a vertical distance to the lower end of said lower knife, a computer able to compute the overlap.