Laser Machining Head Calibration for Comparable Process Monitoring
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Solution Overview
Problem
Laser machining systems of the same construction produce varying intensity signals due to manufacturing tolerances and quality fluctuations in optical and mechanical components, making it difficult to compare and ensure monitoring quality across identical systems.
Innovation Solution
A method using a stabilized light source to generate intensity signals that are aligned with the laser machining head and sensor module, allowing comparison to reference values, and determining a scaling factor for consistent monitoring across identical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser machining systems of the same construction are used, then production capacity and consistency are improved, but manufacturing tolerances and quality fluctuations in optical and mechanical components cause variations in intensity signals that worsen comparability and monitoring reliability
Solution Approach 1:
A light source is introduced as an intermediary component to generate test radiation that passes through the beam guidance optics and is detected by the sensor module. This intermediary radiation source allows characterization of the optical components without requiring actual laser machining, enabling comparison of beam guidance properties across identical systems while maintaining production capacity.
Solution Approach 2:
The patent creates a copy of the actual laser beam path using test radiation from a light source. This copy allows measurement and comparison of beam guidance properties through optical elements without affecting actual machining operations, thus maintaining productivity while enabling reliability assessment through standardized testing.
2Measurement precision
If identical monitoring parameters are used across laser machining systems, then comparability is improved, but manufacturing tolerances in optical elements cause different signal ranges that worsen measurement accuracy
Solution Approach 1:
The patent changes the approach from using fixed monitoring parameters across all systems to determining system-specific parameters based on measured beam guidance properties. Each system's optical elements are characterized individually, and monitoring parameters are adjusted accordingly, transforming the problem from one of uniformity to one of personalized calibration that achieves true comparability.
Solution Approach 2:
The beam guidance properties are characterized in advance using test radiation before actual machining operations. This preliminary characterization determines system-specific parameters that are stored and used during monitoring, allowing identical monitoring conditions to be achieved across different systems despite manufacturing tolerances in optical elements.
3Ease of operation
If beam guidance properties are standardized across laser machining systems, then ease of operation and monitoring are improved, but manufacturing tolerances in optical and mechanical components cause variations that worsen signal consistency
Solution Approach 1:
The patent implements a feedback mechanism where beam guidance properties are measured using test radiation, and these measurements are used to determine system-specific parameters for monitoring. This feedback loop ensures that each system is configured based on its actual optical characteristics, maintaining ease of operation through standardized procedures while achieving signal consistency through personalized calibration.
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 meaningful comparison and monitoring of laser machining systems of the same type, ensuring consistent beam guidance and detection properties, and allowing for identical monitoring parameters to be used across systems, thereby improving process quality and comparability.
Implementation Method 1
a sensor module (32) including at least one sensor (34), in particular a photodiode-based sensor or a photodiode, for detecting process radiation
Implementation Method 2
providing a light source (42) and aligning the laser machining head (12) and the light source (42) with one another in such a way that the detected intensity signal assumes a maximum value
Data Source
AI summary
A method for comparing laser machining systems is provided, wherein a laser machining system comprises a laser machining head and a sensor module having at least one photodiode for detecting process radiation, said method comprising: detecting radiation emitted from a light source by means of the photodiode and generating a corresponding intensity signal, wherein the radiation is guided from the light source to the photodiode by at least one optical element in the laser machining head and/or by at least one optical element of the sensor module; aligning the laser machining head and the light source with one another so that the intensity signal assumes a maximum value; and comparing the intensity signal with at least one predetermined reference value. A method for monitoring a laser machining process and an associated laser machining system are also provided.