Laser Beam Shaping for Direction-Specific Metal Processing
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Solution Overview
Problem
Current laser processing machines for metallic materials face limitations in controlling the transverse power distribution of the laser beam, leading to suboptimal performance in terms of speed, quality, and cost-effectiveness, particularly in processes like cutting and drilling, where maintaining rotational symmetry complicates the control of working paths and results in lower quality processing.
Innovation Solution
The method involves real-time control of the laser beam's transverse power distribution by shaping the beam to achieve various power distributions such as Gaussian, annular, flat, or complex asymmetric profiles, allowing for dynamic adjustment during the processing operation to optimize energy use and improve material removal, using a deformable reflecting element with independently movable areas to modify the beam's shape and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rotational symmetry is maintained in laser beam power distribution, then the control of working paths is simplified, but the processing quality and speed are reduced
Solution Approach 1:
The patent applies asymmetry by intentionally breaking the rotational symmetry of the laser beam power distribution. The control system modifies the transverse power distribution to create asymmetric profiles that are optimized for the direction of the working path, enabling faster processing speeds and improved quality while maintaining ease of control through automated adjustment.
Solution Approach 2:
The patent implements dynamics by making the laser beam power distribution adjustable in real-time during processing. The control system dynamically modifies the transverse power distribution according to the instantaneous direction and characteristics of the working path, allowing the system to adapt to different processing conditions and optimize performance.
2Device complexity
If fixed power distribution is used, then the device complexity is reduced, but the adaptability to different processing conditions is limited
Solution Approach 1:
The patent applies universality by creating a single beam control system that can generate multiple transverse power distribution profiles. The control system is designed to adaptively modify the power distribution according to different processing conditions, material types, and working path characteristics, making the system versatile without requiring multiple dedicated systems.
Solution Approach 2:
The patent implements parameter changes by allowing dynamic modification of the laser beam's transverse power distribution parameters. The control system adjusts parameters such as beam shape, intensity profile, and spatial distribution in real-time based on processing requirements, enabling adaptation to various conditions while using a single unified system.
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 enhances the speed and quality of laser processing by enabling precise control of the power distribution along the working path, reducing burrs and roughness, and allowing for three-dimensional flexibility in processing, thereby improving the efficiency and effectiveness of cutting and drilling operations.
Implementation Method 1
a deformable reflecting element with independently movable areas to modify the beam's shape and position
Implementation Method 2
the laser is used as a thermal tool for a wide variety of applications that depend on the interaction parameters of the laser beam with the material being processed
Implementation Method 3
the control of these parameters enables welding, cutting, drilling, engraving and marking processes to be carried out
Implementation Method 4
directing a high energy density (on the order of tens of MW per mm2 of surface) for a time on the order of femtoseconds or picoseconds, a photo-ablation process is achieved
Implementation Method 5
an assist gas flow must be provided to the working region wherein the interaction between the laser beam and the material occurs which has the mechanical functions of propulsion of the molten material
Data Source
AI summary
A method of laser processing of a metallic material is described, by means of a focused laser beam having a predetermined transverse power distribution on at least one working plane of the metallic material, comprising the steps of:providing a laser beam emitting source;leading the laser beam along a beam transport optical path to a working head arranged in proximity to the material;collimating the laser beam along an optical axis of propagation incident on the material;focusing the collimated laser beam in an area of a working plane of the material; andconducting said focused laser beam along a working path on the metallic material comprising a succession of working areas,wherein the laser beam is shaped:by reflecting the collimated beam by means of a deformable controlled surface reflecting element having a plurality of independently movable reflection areas, andby controlling the arrangement of the reflection areas to establish a predetermined transverse power distribution of the beam on at least one working plane of the metallic material as a function of the area of the current working plane and/or of the current direction of the working path on the metallic material.