Dual-Core Laser Beam Termination to Prevent End-Point Craters
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Solution Overview
Problem
The existing laser processing methods often result in crater formation at the end point of laser emission, degrading the quality of the workpiece.
Innovation Solution
A laser processing method that adjusts the output power of both the first and second laser beams, where the first laser beam is emitted from the second core and the second laser beam from the first core, with the output power of the second laser beam gradually reduced while moving the emission position, and the second laser beam is stopped while the first laser beam continues to be emitted from the second core, to prevent crater formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first laser beam and the second laser beam are stopped at the same time at the laser end point, then the processing time is reduced, but craters are formed which degrade the workpiece processing quality
Solution Approach 1:
The first laser beam is made to continue emitting after the second laser beam is stopped. This preliminary action of extending the first laser beam emission prevents crater formation at the laser end point by maintaining melting and smoothing of the workpiece surface even after the primary processing laser (second beam) has ceased, thereby resolving the contradiction between reduced processing time and maintained quality
Solution Approach 2:
The emission timing parameters of the two laser beams are changed asymmetrically at the laser end point. Instead of stopping both beams simultaneously, the control device stops the second laser beam while continuing to emit the first laser beam. This parameter change in emission timing prevents crater formation while minimizing additional processing time, resolving the technical contradiction
2Manufacturing precision
If the first laser beam is made to surround the second laser beam by emitting from the second core, then the preheating effect and surface smoothing are improved, but the device complexity increases due to dual-core fiber configuration
Solution Approach 1:
The first laser beam emitted from the second core is configured to surround the second laser beam emitted from the first core, creating a nested beam structure. This nesting arrangement allows the first laser beam to provide preheating and surface smoothing effects on the workpiece while the second laser beam performs the primary processing, achieving improved surface quality without requiring separate positioning systems or additional optical components
Solution Approach 2:
The dual-core transmission fiber is designed to transmit both the first laser beam and the second laser beam simultaneously through different cores. This multi-functional fiber structure enables both beams to be delivered through a single transmission medium, reducing the need for separate fiber cables and alignment systems, thereby mitigating the increase in device complexity while achieving the desired processing quality
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 reduces crater formation at the laser end point, enhancing the quality of the workpiece by maintaining the emission of the first laser beam after stopping the second laser beam and increasing the emission range of the first laser beam from both cores.
Implementation Method 1
The ring-shaped first laser beam that has passed through the second core is emitted to surround the second laser beam emitted from the first core. It is thus possible to preheat a region in front of the second laser beam and also make the processed surface behind the second laser beam smooth.
Implementation Method 2
processing a workpiece by emitting laser beams transmitted through a transmission fiber
Data Source
AI summary
A transmission fiber includes a first core and a second core. The second core is provided on the outer periphery of the first core. In a first step of a laser termination process, a first laser beam is emitted from the second core, and a second laser beam is emitted from the first core. In a second step, the output power of the second laser beam is gradually reduced while a position at which the first laser beam and the second laser beam are emitted to a workpiece is moved in a laser processing direction. In a third step, the output of the second laser beam is stopped while the first laser beam is emitted from the second core.