Powder Bed Laser Array with Non-Uniform Energy Profile Control
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Solution Overview
Problem
Existing additive manufacturing systems, such as Direct Metal Laser Melting, face challenges in component quality due to variations in heat transfer and thermal conductivity, leading to inconsistent melt pool sizes and poor surface finishes, affecting dimensional accuracy and feature resolution.
Innovation Solution
A method and system utilizing a laser array with individually controllable laser devices to generate a non-uniform energy intensity profile, allowing for dynamic adjustment of melt pool characteristics by varying power output across the array, compensating for thermal losses and geometry-specific requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-powered laser device is used to fabricate components in additive manufacturing systems, then manufacturing efficiency and productivity are improved, but component quality deteriorates due to excess heat and variation in heat transfer creating inconsistent melt pools
Solution Approach 1:
The laser device is divided into multiple laser sources arranged in an array configuration. Each laser source can be independently controlled to target specific regions of the powder bed, allowing parallel processing that maintains high productivity while distributing heat input to prevent excessive localized heating and improve melt pool consistency.
Solution Approach 2:
Each laser source in the array is equipped with independent power control and positioning capabilities, enabling localized adjustment of energy input based on specific region requirements. This allows optimization of melt pool characteristics in different areas of the build plate, improving overall component quality while maintaining high manufacturing efficiency.
2Productivity
If the laser power is increased to improve manufacturing efficiency, then productivity increases, but melt pool depth and size become uncontrolled, resulting in poor surface finish and reduced manufacturing precision
Solution Approach 1:
The laser array system implements dynamic control where each laser source can independently adjust its power output and positioning in real-time based on feedback and process requirements. This dynamic capability allows maintenance of optimal melt pool dimensions even at high overall power levels, ensuring good surface finish while achieving high productivity through parallel processing.
3Device complexity
If a single laser device is used to simplify the system, then device complexity is reduced, but manufacturing precision deteriorates due to inability to compensate for thermal losses and geometry-specific requirements
Solution Approach 1:
The laser array system serves multiple functions simultaneously: it provides parallel processing for high productivity, independent power control for precision, and the ability to address different geometric requirements across the build plate. Each laser source can be configured for specific tasks, making the system universally applicable to various component geometries while maintaining high dimensional accuracy.
4Productivity
If the melt pool size is increased to improve manufacturing efficiency, then productivity increases, but dimensional accuracy and small feature resolution are reduced due to melt pool variations
Solution Approach 1:
By segmenting the laser system into multiple independent sources, the system can process larger areas in parallel (improving productivity) while each individual laser maintains a controlled, smaller melt pool size (preserving dimensional accuracy and feature resolution). The segmented approach allows simultaneous optimization of both productivity and precision.
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 enables the creation of consistent melt pool profiles, improving component quality by maintaining a flat solidification front and optimizing melt pool depth and size, thereby enhancing surface finish and dimensional accuracy.
Implementation Method 1
emitting a plurality of energy beams from a plurality of selected laser devices of the plurality of laser devices to generate a melt pool
Implementation Method 2
component quality may be reduced due to excess heat and/or variation in heat being transferred to the metal powder by the laser device within the melt pool
Data Source
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AI summary
An additive manufacturing system (10) includes a laser array (12,100,200,300,400) having a plurality of laser devices (102). Each laser device (102) of the plurality of laser devices (102) is configured to generate a melt pool in a layer of powdered material. An actuator system (24) moves the laser array (12,100,200,300,400) across the layer of powdered material. A controller (16) is configured to generate control signals (38) to independently control a power output of each laser device (102). The controller (16) transmits the control signals (38) to each laser device (102) to emit a plurality of energy beams (22, 104, 304, 408) from a plurality of selected laser devices (102) of the plurality of laser devices (102) to generate the melt pool. The controller (16) generates a non-uniform energy intensity profile (1000, 1100, 1300) from the plurality of selected laser devices (102). The non-uniform energy intensity profile (1000, 1100, 1300) generates the melt pool having a predetermined characteristic.