Powder Bed Fusion Beam Oscillation for Single-Pass Thin Walls
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Solution Overview
Problem
Existing additive manufacturing methods face challenges in building thin walls with uniformity and efficiency due to the requirement of multiple passes of energy beams, which can inhibit the minimal obtainable thickness and uniformity of consolidated build material.
Innovation Solution
The use of energy beam oscillations to consolidate build material, allowing for the formation of thin walls with a single pass and improved uniformity by creating larger melt pools through oscillating paths, reducing the need for additional passes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple passes of energy beams are used to consolidate wall material, then the wall can be built with sufficient consolidation, but the minimal obtainable thickness is inhibited and processing time increases
Solution Approach 1:
The energy beam is made dynamic by implementing oscillation motion during the consolidation process. The beam oscillates between oscillating paths while maintaining a transverse travel path, creating a larger effective melt pool area. This dynamic approach allows single-pass consolidation of thin walls with sufficient uniformity, eliminating the need for multiple passes and thereby increasing processing speed while maintaining wall thickness uniformity.
2Manufacturing precision
If multiple passes of energy beams are used to consolidate wall material, then the wall can be built with sufficient consolidation, but the process complexity increases
Solution Approach 1:
The energy beam delivery system is made dynamic through oscillation mechanisms that move the beam between oscillating paths during transverse travel. This dynamic oscillation creates a larger melt pool area in a single pass, achieving sufficient consolidation uniformity without requiring multiple passes, thereby reducing process complexity.
3Measurement precision
If the energy beam diameter is small, then precision is improved, but the ability to create uniform thin walls with adequate melt pool size is reduced
Solution Approach 1:
The solution transitions from a single-dimensional beam path to a two-dimensional oscillating path area. By oscillating the beam between multiple paths transverse to the travel direction, the effective melt pool area is expanded in the lateral dimension while maintaining the precision of the beam spot size. This dimensional expansion allows adequate melt pool size for uniform wall consolidation without sacrificing beam 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 construction of thin walls with higher efficiency, precision, and uniformity in additive manufacturing, speeding up the process and avoiding inconsistencies associated with multiple passes.
Implementation Method 1
one or more energy beams are directed onto a powder bed to melt, fuse, or sinter sequential layers of build material
Implementation Method 2
additive manufacturing may involve a powder bed fusion process in which one or more energy beams are directed onto a powder bed to melt, fuse, or sinter sequential layers
Implementation Method 3
one or more oscillating paths are defined transverse to a build direction, the one or more oscillating paths comprising a plurality of oscillations
Data Source
AI summary
Methods of additively manufacturing a three-dimensional object include irradiating a first build plane region using a first energy beam defining a beam diameter, the first energy beam travelling along a first oscillating path in a first direction to consolidate a first wall defining a thickness perpendicular to the first direction, wherein a build material adjacent a first side of the first wall and the build material adjacent a second side of the first wall, opposite the first side of the first wall, remains unconsolidated; and wherein the thickness of the first wall is greater than the beam diameter.