Multi-Laser Melt Pool Control in 3D Metal Printing
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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 struggle to achieve uniform heat distribution and symmetry in metal fusion processes, affecting the quality and accuracy of the final product.
Innovation Solution
A 3D laser printing apparatus using a plurality of laser sources symmetrically arranged on a hemisphere, with each source having a focusing lens and controlled by CPU/GPU devices to shift and tilt the focal points, allowing for uniform heat distribution and precise control of the melt pool formation on a metal wire or powder material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional manufacturing methods are used to produce intricate shapes, then the required equipment becomes complex and expensive, but the manufacturing capability is sufficient
Solution Approach 1:
The manufacturing process is segmented into discrete layers that are built sequentially. Each layer is created by selectively fusing material in specific patterns, allowing complex 3D shapes to be constructed from simple 2D cross-sections. This segmentation enables intricate geometries to be achieved through additive processes rather than complex subtractive machining.
Solution Approach 2:
The invention transitions from traditional 2D or 3D manufacturing approaches to 4D manufacturing by adding the time dimension through layer-by-layer construction. Each layer represents a snapshot in time of the building process, allowing complex shapes to be achieved through temporal sequencing of simple operations rather than spatial complexity in a single step.
2Device complexity
If a single laser source is used for metal fusion, then the equipment is simpler, but uniform heat distribution and symmetry are difficult to achieve
Solution Approach 1:
The single laser source is segmented into multiple virtual laser sources through computational control. The laser beam is dynamically steered and focused to create multiple focal points or scanning patterns that distribute heat uniformly across the build area. This virtual segmentation allows symmetric heat distribution without physically multiplying the laser sources.
Solution Approach 2:
The laser source system is made dynamic through real-time control of beam positioning, focusing, and scanning patterns. The focal point can be dynamically shifted and tilted to different positions, allowing the system to adapt heat distribution to match the geometric requirements of each layer and maintain symmetry throughout the building process.
3Temperature
If multiple laser sources are used to improve heat distribution, then temperature uniformity improves, but device complexity increases
Solution Approach 1:
The single laser source is designed to perform multiple functions that would traditionally require separate laser units. By implementing dynamic beam steering, focal point shifting, and tilted focal point capabilities, one laser source can achieve the heat distribution patterns of multiple fixed sources, eliminating the need for complex multi-laser arrangements while maintaining temperature uniformity.
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 symmetry, reducing the need for expensive equipment and improving the quality of the final product by providing a controllable melt pool for additive manufacturing and various applications.
Implementation Method 1
a laser beam is focused in a focal point at a given distance from the focusing lens... treating the metal material by fusing on the surface of the substrate
Implementation Method 2
Each laser source contains a laser with a laser-beam focusing lens that focuses the laser beam in a focal point
Implementation Method 3
The laser source is also provided with CPU/GPU-controlled devices for independently shifting each laser... to selectively positioning the focal points of the lasers on any point of the fed material or on a substrate for forming and controlling the melt pool formation
Data Source
AI summary
An apparatus for 3D laser printing and a method for fusing a metal material with control of a melt pool on a substrate are provided. The apparatus contains a metal wire or powder feed unit and a plurality of laser sources symmetrically arranged on the surface of an imaginary hemisphere. Each laser source contains a laser with a laser beam focusing lens that focuses the laser beam in a focal point at a given distance from the focusing lens. The laser source is also provided with CPU/GPU-controlled devices for independently shifting each laser or a group of lasers along the optical axis and/or for tilting the lasers relative to the longitudinal axis of the source housing so that heating or fusing can be performed by placing the focal points of the lasers selectively at any point of the material or on a substrate for forming and controlling the melt pool.