Optical Milling Gap Control for Flexible Antenna Milling
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Solution Overview
Problem
The existing manufacturing process for antenna structures in value and security documents often results in faulty milling due to late recognition of spatial discrepancies between the milling tool and die, leading to increased rejection rates.
Innovation Solution
A device and method for monitoring and controlling the milling operation using a light emitter/receiver to detect the width of the milling gap between the milling cutter and die, allowing for real-time adjustment to maintain consistent dimensions and geometry, thereby reducing faulty milling results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors monitor the design of the antenna after milling, then the milling result can be checked, but the recognition occurs too late due to spatial distance and corrective reworking is not possible
Solution Approach 1:
The optical sensor detects the position of the milling tool and die before the milling operation completes, allowing prediction of the final antenna design. This preliminary detection enables corrective action before the product leaves the milling gap, eliminating the detection delay while maintaining high measurement precision.
Solution Approach 2:
An intermediary optical detection system is introduced that observes the milling process through the milling gap without interfering with the operation. The sensor detects tool positions and predicts design outcomes, serving as a mediator between the milling process and quality control, enabling real-time monitoring without spatial distance delays.
2Productivity
If the milling gap width is not monitored, then the manufacturing process is simple, but thermal drift causes dimensional variations and increased rejection rate
Solution Approach 1:
The optical sensor provides continuous feedback on the milling gap width by detecting the positions of the milling tool and die. This feedback is fed to the control system which automatically adjusts the gap width to compensate for thermal drift, maintaining dimensional consistency during high-speed production without reducing throughput.
Solution Approach 2:
The system dynamically changes the milling gap width parameter in response to detected thermal drift. By continuously adjusting this critical parameter based on real-time optical measurements, the system maintains manufacturing precision while operating at high production speeds, resolving the contradiction between productivity and precision.
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
The solution enables precise monitoring and adjustment of the milling process, ensuring accurate production of antenna structures with reduced rejection rates and maintaining consistent dimensions even during high-throughput operations.
Implementation Method 1
The light strip can be oriented and dimensioned, and the milling cutter and the die arranged, so that the milling cutter and the die shadow the light strip at least at one of its two longitudinal edges before the light receiver receives the light strip. The light strip is thus characteristic of the width of the milling gap between the milling cutter and the die in one of its transverse dimension impinging at the light receiver.
Data Source
AI summary
A milling device for milling an antenna structure out of the metal layer of a flexible product, while the product is being passed through a milling gap between a milling cutter and a die, using a light emitter to output a light strip that crosses through the milling gap in or transversely to a running direction of the product, wherein the light strip is dimensioned, and the milling cutter and the die are intended to be arranged, such that the milling cutter and the die shadow the light strip at the two longitudinal edges thereof, before a light receiver receives the light strip, and using the light receiver to output a signal that reproduces the width of the milling gap to a controller, and outputting an adjusting signal at least to an adjusting drive that influences the width of the milling gap between the milling cutter and the die.