Dual-Beam Optical Machining for Low-Spatter Laser Cutting
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Solution Overview
Problem
Laser machining technologies face issues with spatter contamination due to sharp heat input during the machining process, which can lead to material deformation and dross formation.
Innovation Solution
An optical machining apparatus utilizing two light sources to preheat and then raise the temperature of a workpiece to the melting point, reducing the instantaneous heat input and minimizing thermal stress, thereby preventing spatter and dross formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser beam is used for machining, then contactless processing is achieved with no tool wear, but spatter contamination occurs due to sharp heat input
Solution Approach 1:
The laser beam is divided into multiple beams (first laser beam and second laser beam) that irradiate different positions on the workpiece. The first laser beam preheats the workpiece from the rear surface, while the second laser beam performs the actual cutting from the front surface, separating the heating function from the cutting function to reduce spatter
Solution Approach 2:
The first laser beam performs preliminary heating of the workpiece before the second laser beam performs the cutting operation. By preheating the workpiece to a predetermined temperature, the material is prepared for cleaner melting and removal, reducing spatter contamination during the actual cutting process
2Productivity
If high power laser is used for efficient machining, then productivity increases, but thermal stress and material deformation increase
Solution Approach 1:
The high power laser processing is segmented into two stages: preheating stage with the first laser beam and cutting stage with the second laser beam. This segmentation allows controlled heat distribution that reduces thermal stress while maintaining high productivity
Solution Approach 2:
Different regions of the workpiece receive different heat treatments: the rear surface receives gentle preheating from the first laser beam, while the front surface receives focused cutting energy from the second laser beam. This local differentiation of heat quality reduces overall thermal stress
3Device complexity
If conventional single-beam laser machining is used, then device complexity is low, but manufacturing precision deteriorates due to spatter and dross
Solution Approach 1:
The single beam system is segmented into two coordinated laser beams with different functions. The first beam handles preheating and the second beam handles precision cutting, improving surface quality and reducing dross while maintaining relatively simple dual-beam device architecture
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 apparatus effectively reduces spatter and dross occurrence by controlled heat transfer, allowing for precise machining of materials with high thermal conductivity and reflectance without damage.
Implementation Method 1
radiate a first beam onto a first position of a surface of a work in such a manner as to transfer heat at a temperature lower than a melting temperature of the work from the first position of the work to a second position of a surface of the work on an opposite side to the first position
Implementation Method 2
radiate a second beam onto the second position such that a temperature of the work exceeds the melting temperature of the work
Data Source
AI summary
According to one embodiment, an optical machining apparatus includes a first light source, and a second light source. The first light source is configured to radiate a first beam onto a first position of a surface of a work in such a manner as to transfer heat at a temperature lower than a melting temperature of the work from the first position of the work to a second position of a surface of the work on an opposite side to the first position. The second light source is configured to radiate a second beam onto the second position such that a temperature of the work exceeds the melting temperature of the work, in a state in which a temperature of the second position is raised by the transfer of the heat.