Simulated Laser Array Beam Modulation for Faster Powder Bed Melting
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Solution Overview
Problem
Additive manufacturing systems, such as Direct Metal Laser Melting, face challenges with long build times and reduced component quality due to non-uniform powder melting caused by energy density and velocity constraints, leading to increased costs and reduced efficiency.
Innovation Solution
A powder melting device with a laser device and a beam modulator that induces angular deflections in the energy beam to generate multiple melt pools, simulating the behavior of an array of lasers, thereby improving power distribution and reducing scan time without causing vaporization or degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single laser beam is used to scan the powder bed layer by layer, then the system complexity is low, but the build time is excessively long (70-100 seconds per layer, days for complete builds)
Solution Approach 1:
The patent segments the single laser beam into multiple virtual beam spots by introducing angular deflections through a beam modulator. This creates a simulated laser array where one physical laser produces multiple effective beam positions simultaneously, thereby processing multiple areas in parallel and dramatically reducing build time without adding multiple physical laser systems
Solution Approach 2:
The patent adds the angular deflection dimension to the traditional single-axis or two-axis scanning system. By controlling the beam modulator to deflect the laser beam at various angles, the system creates a three-dimensional beam path control (x, y, and angular dimensions), enabling simultaneous multi-point processing and transforming sequential scanning into parallel processing
2Productivity
If the laser scans at high velocity to reduce build time, then productivity improves, but component quality deteriorates due to non-uniform powder melting caused by vaporization and Rayleigh instability
Solution Approach 1:
By dividing the energy delivery into multiple angularly deflected beam spots, each spot receives reduced energy density compared to a single high-power spot. This segmentation of energy delivery allows faster scanning speeds while maintaining uniform melting without vaporization or Rayleigh instability, as the energy is distributed across multiple locations simultaneously
Solution Approach 2:
The beam modulator introduces periodic angular deflections to rapidly switch the laser beam between multiple positions. This periodic action creates a simulated array effect where the laser alternates between different angles and positions, delivering energy in a controlled periodic pattern that prevents overheating and vaporization while maintaining high scan speeds
3Productivity
If multiple lasers are used to process large areas simultaneously, then build time is reduced, but device complexity and cost increase significantly
Solution Approach 1:
The patent makes a single laser device perform multiple functions by equipping it with a beam modulator that can deflect the beam at various angles. This one laser serves the role of multiple lasers by creating a simulated array through angular deflection, achieving parallel processing capability without the complexity and cost of multiple physical laser systems
Solution Approach 2:
The beam modulator acts as an intermediary device between the single laser source and the powder bed. It mediates the laser beam by introducing angular deflections that create multiple virtual beam spots, effectively transforming one laser into a multi-beam system without requiring multiple actual laser devices
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 consistent and efficient manufacturing of large areas with a single laser, reducing build time and costs while maintaining component quality by controlling the energy beam's deflection and power distribution.
Implementation Method 1
a beam modulator configured to selectively induce an angular deflection in the energy beam for a predetermined time period such that the energy beam generates a plurality of melt pools in a powder bed
Implementation Method 2
a laser device configured to emit an energy beam
Implementation Method 3
The focused energy source device melts the particulate material on the build platform in and around the area where the focused energy source is incident on the particulate material, resulting in at least one melt pool
Data Source
AI summary
A powder melting device for an additive manufacturing system including a laser device configured to emit an energy beam and a beam modulator. The beam modulator is configured to selectively induce an angular deflection in the energy beam for a predetermined time period such that the energy beam generates a plurality of melt pools in a powder bed.