Movable Optical Unit for Additive Manufacturing
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Solution Overview
Problem
Current additive manufacturing methods face inefficiencies in debris removal and multi-laser beam management within the build chamber, particularly in scanning and consolidating powder layers across a wide area, leading to reduced build speed and accuracy.
Innovation Solution
The apparatus employs a movable optical unit with steerable laser beams and a gas flow device, allowing for simultaneous movement and control of laser beams to scan across a powder bed efficiently, with overlapping scanning zones for enhanced coverage and a 'plug and play' optical assembly design for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single laser beam is scanned across the powder bed, then the system is simple to control, but the build speed is limited
Solution Approach 1:
The build chamber is divided into multiple scanning zones, with each optical unit responsible for a specific zone. This segmentation allows parallel processing of different powder bed regions, significantly increasing build speed while keeping each optical unit's control relatively simple and modular.
Solution Approach 2:
Multiple optical units are employed that can each independently scan and consolidate powder in their respective zones. These units perform the same function (laser scanning and consolidation) but operate simultaneously in different spatial regions, achieving parallel processing and improved productivity.
2Area of stationary object
If multiple optical units scan across the entire width of the powder bed, then coverage is maximized, but the time to scan each zone is increased
Solution Approach 1:
The powder bed width is divided into multiple zones, with each optical unit assigned to scan only its specific zone. This segmentation allows all optical units to operate simultaneously and independently, covering the entire powder bed width without sequential scanning delays.
Solution Approach 2:
Multiple optical units operate continuously and simultaneously across different zones of the powder bed, eliminating idle time between zone completions. The parallel operation ensures that the entire build area is processed without interruption, maximizing productivity.
3Manufacturing precision
If the optical unit moves slowly across the powder bed, then scanning precision is improved, but build speed decreases
Solution Approach 1:
The scanning task is divided into multiple zones handled by different optical units. Each unit can move at optimized speeds for its specific zone while maintaining precision, and the parallel execution of multiple zones compensates for the reduced speed in each individual zone.
Solution Approach 2:
The system transitions from single-dimension sequential scanning to multi-dimensional parallel scanning. Multiple optical units operate simultaneously in the lateral dimension, effectively increasing the scanning throughput without compromising the precision of individual beam paths.
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 solution enables faster scanning and consolidation of powder layers across a wide area, improving build speed and accuracy by allowing independent control of each laser beam and integrated gas flow for debris management, while maintaining ease of maintenance through modular design.
Implementation Method 1
a laser beam is scanned across portions of the powder layer that correspond to a cross-section of the object being constructed. The laser beam melts or sinters the powder to form a solidified layer.
Implementation Method 2
It is known to introduce a gas flow through the build chamber in an attempt to remove debris from the chamber in the gas flow.
Data Source
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AI summary
Additive manufacturing apparatus for building objects by layerwise consolidation of material. The apparatus comprises a build chamber containing a working area, a plurality of high energy beams (133) or consolidating material deposited in the working area in layers and an optical unit (135) for controlling transmission of the high energy beams onto material in the working area. The optical unit (135) comprises a plurality of independently controllable optical elements (141) each optical element (141) controlling transmission of at least one of the high energy beams onto the material in the working area, the optical unit (135) movable in the build chamber.