Laser Beam Wobble Compensation for High-Frequency Figure Fidelity
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Solution Overview
Problem
Conventional 2D scanner systems for superimposing primary relative movement of the laser beam and workpiece with wobbling movement suffer from figure reproduction errors due to changes in size and geometry at higher wobbling frequencies, caused by inertia and mass effects, leading to deviations from the desired wobble figure.
Innovation Solution
A system and method for material processing using a laser beam, where a deflection unit controls the wobble movement according to a compensated wobble movement, adapting control values for deflection and path speed based on wobble frequency and position, to precompensate for figure reproduction errors and maintain desired wobble figure fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wobble frequency is increased to improve processing speed, then productivity increases, but figure reproduction precision deteriorates due to inertia and mass effects causing deviations from the desired wobble figure
Solution Approach 1:
The control system pre-calculates and applies compensation values before the wobble motion occurs. By determining the compensated wobble movement in advance based on the desired wobble figure and system characteristics, the control system counteracts the expected inertia and mass effects that would otherwise cause figure reproduction errors at high frequencies
Solution Approach 2:
The system dynamically adjusts control parameters (deflection values, timing) based on the wobble frequency and system response characteristics. By changing these parameters as a function of frequency, the system maintains accurate figure reproduction across a wide range of operating conditions while enabling high processing speeds
2Duration of action of moving object
If the wobble frequency is increased to reduce processing time, then duration of action decreases, but manufacturing precision deteriorates due to changes in size and geometry of the wobble figure
Solution Approach 1:
The control system pre-calculates and applies compensation values before the wobble motion occurs. By determining the compensated wobble movement in advance based on the desired wobble figure and system characteristics, the control system counteracts the expected inertia and mass effects that would otherwise cause figure reproduction errors at high frequencies
Solution Approach 2:
The system dynamically adjusts control parameters (deflection values, timing) based on the wobble frequency and system response characteristics. By changing these parameters as a function of frequency, the system maintains accurate figure reproduction across a wide range of operating conditions while enabling high processing speeds
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 approach allows for improved figure reproduction fidelity, enabling increased processing speed and scalability of process parameters like laser power and frequency while maintaining weld seam quality, and allows for a wider range of wobble frequencies without significant changes in wobble figure size or shape.
Implementation Method 1
a deflection unit (40; 40.1, 40.2) for deflecting the laser beam (14)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
System for material processing using a laser beam, comprising a deflection unit (40) for deflecting the laser beam (14) and a wobble unit (60) configured to superimpose a wobble motion of the laser beam (14) with a wobble pattern and a wobble frequency onto a feed movement of the laser beam (14) corresponding to a processing path by controlling the deflection unit (40), wherein the wobble unit (60) is configured to control the deflection unit (40) according to a compensated wobble motion in order to execute the wobble motion, in which control values for a deflection of the laser beam (14) along the wobble pattern are adapted as a function of the wobble frequency and/or a path velocity of the wobble motion varying along the wobble pattern as a function of a position of the laser beam (14) in the wobble pattern and of the wobble frequency is; as well as methods for material processing using a laser beam.