3D Laser Printing with Hemispherical Beams for Melt Pool Control
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Solution Overview
Problem
Conventional manufacturing methods for producing intricate shapes require complex and expensive equipment, and existing 3D laser printing technologies face challenges in controlling melt pool parameters like temperature distribution and cooling rates, which are crucial for microstructure and defect formation but remain poorly understood due to high spatial and time resolution requirements.
Innovation Solution
A method for 3D laser printing using a plurality of laser sources symmetrically arranged on a hemispherical surface, emitting beams that converge to a focal point on a metal wire or powder, allowing for controlled melt pool formation by adjusting the angle and displacement of laser beams to achieve uniform heat distribution and symmetry in the formed object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing methods are used to produce intricate shapes, then the required precision and quality can be achieved, but the equipment complexity and cost increase significantly
Solution Approach 1:
The manufacturing process is segmented into discrete layers that are added sequentially. Each layer is built independently through controlled material deposition and selective melting, allowing complex 3D geometries to be constructed from simple 2D cross-sections without requiring complex machining equipment
Solution Approach 2:
The invention transitions from conventional 3D machining (subtractive manufacturing in three dimensions) to layered additive manufacturing. By building objects layer-by-layer in the vertical dimension, the system achieves complex geometries that would require multiple setup changes and complex toolpaths in traditional machining, thereby simplifying the equipment requirements
2Temperature
If a single laser source is used for melting material, then the equipment is simpler, but the melt pool temperature distribution and symmetry are poor
Solution Approach 1:
The single laser source is segmented into multiple independent laser beams that can be controlled separately. Each laser source targets a specific region of the melt pool, allowing independent control of temperature distribution across different zones to achieve uniform heating and symmetric melt pool geometry
Solution Approach 2:
Multiple laser sources are merged into a coordinated system where their individual beams converge on the same work area. The combined effect of multiple lasers provides superior temperature distribution and melt pool control compared to a single laser, while the sources can be arranged in a compact hemispherical configuration
3Manufacturing precision
If laser beams are focused at a fixed point, then the setup is simpler, but the melt pool control and microstructure quality are insufficient
Solution Approach 1:
The laser beam focusing system transitions from a static fixed focal point to a dynamic adjustable system. The focal point can be moved along the optical axis and the angle of incidence can be adjusted in real-time to control melt pool depth, width, and temperature distribution, enabling precise control of microstructure formation
Solution Approach 2:
The system dynamically changes key parameters including focal point position, laser beam angle of incidence, and laser power intensity. By adjusting these parameters during the melting process, the system optimizes melt pool characteristics for different material types and desired microstructures without requiring complex mechanical reconfiguration
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 the production of intricate shapes with high accuracy and precision, reducing the need for expensive equipment and improving control over melt pool parameters, resulting in enhanced microstructure and defect reduction in additive manufacturing.
Implementation Method 1
heating/fusing metal wire or powder material with controllable melt pool
Implementation Method 2
The surface of the article is melted locally using the laser light source to form a melt pool
Implementation Method 3
a plurality of laser sources, which are arranged symmetrically on a hemispherical surface, emitting beams that converge to a focal point
Implementation Method 4
The melt pool is solidified to form the build layer having a desired microstructure on the surface of the article
Data Source
AI summary
A method for fusing a metal material with control of a melt pool on a substrate is provided. The method consists of providing a plurality of laser sources arranged on an imaginary hemispheric surface, wherein each laser source contains a laser tiltable relative to the longitudinal axis of the laser source housing and/or displaceable in the direction of the longitudinal axis of the housing. The optical axes of the lasers are inclined to the material feed direction toward a substrate. The optical axes of the inclined lasers intersect the material feed direction. The material is fed toward a substrate which is placed on a table that has at least three degrees of freedom for moving the substrate in a space relative to the focal points of the laser beams to impart to the object being printed a desired 3D configuration.