Laser Machining Spectral Feedback for Real-Time Parameter Correction
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Solution Overview
Problem
The existing laser machining apparatus has lower accuracy in detecting the processing state and difficulty in adjusting machining conditions due to its reliance on monitoring time-series light levels, leading to inefficient machining parameter adjustments.
Innovation Solution
A laser machining apparatus that includes an actuator for positioning the machining head, a control unit for managing machining parameters, a machining state observation unit for detecting light intensities across multiple wavelength bands, a feature extraction unit for correlating optical sensor signals, and a correction quantity calculation unit for determining necessary parameter adjustments based on extracted features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If monitoring is based on selected time-series level of light, then the monitoring system is simple to implement, but the accuracy in detecting the processing state is lower
Solution Approach 1:
The patent segments the process light into multiple wavelength bands using optical filters or a diffraction grating, and detects each band separately with photodetectors. This segmentation of the spectral information allows for more precise detection of machining states by analyzing specific wavelength characteristics, resolving the contradiction between detection accuracy and system simplicity.
Solution Approach 2:
The patent transitions from monitoring a single time-series light level to analyzing the spectral distribution across multiple wavelength bands. This adds a spectral dimension to the monitoring system, enabling more accurate detection of processing states through wavelength-specific absorption characteristics of the workpiece material.
2Ease of operation
If only determination of good or bad processing is performed, then the monitoring system is simple, but the adjustment of processing condition is difficult
Solution Approach 1:
The patent implements a feedback mechanism where the detected spectral information from multiple wavelength bands is used to automatically adjust machining parameters. The system continuously monitors the process light, compares it against reference values, and adjusts laser power, feed rate, or other parameters in real-time to maintain optimal machining conditions, making the system easier to operate while preserving detailed processing state information.
Solution Approach 2:
The patent introduces an intermediary control unit that processes the spectral information from the photodetectors and translates it into actionable adjustments for the machining parameters. This intermediary layer bridges the gap between simple detection and complex parameter adjustment, enabling automatic optimization without requiring operator expertise in interpreting spectral data.
3Productivity
If adjustment work is performed manually based on multiple machining parameters, then the machining quality can be maintained, but the adjustment work requires a relatively long time
Solution Approach 1:
The patent enables the machining system to self-adjust by automatically detecting processing state deviations through spectral analysis and correcting machining parameters without human intervention. The system uses the spectral information from multiple wavelength bands to identify quality issues and autonomously adjusts laser power, focus position, or feed rate to maintain machining quality, dramatically reducing adjustment time while preserving manufacturing 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
This solution enables faster and more accurate machining state detection and condition adjustments, improving the overall precision and efficiency of the machining process.
Implementation Method 1
a machining state observation unit that detects, from process light, light intensities in a plurality of predetermined wavelength bands of interest as a plurality of optical sensor signals, the process light being light generated from the object to be machined by laser beam irradiation
Data Source
AI summary
A laser machining apparatus includes an actuator that changes relative positions of a machining head and a workpiece; a control unit that controls in machining execution the laser oscillator, the machining head, and the actuator based on a machining parameter; a machining state observation unit that detects, from process light that is light generated from the workpiece by laser beam irradiation, light intensities in a plurality of predetermined wavelength bands as a plurality of optical sensor signals; a feature extraction unit that extracts at least one of features, the features being obtainable from an index of correlation between the plurality of optical sensor signals and from one of the optical sensor signals; and a correction quantity calculation unit that determines the machining parameter to be corrected as a correction parameter and a correction quantity for the correction parameter based on the at least one of the features.