Single-Pass Oscillating Beam Control for Uniform Thin AM Walls
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Solution Overview
Problem
Existing additive manufacturing methods face challenges in achieving minimal and uniform wall thickness due to the need for multiple energy beam passes, which can lead to inefficiencies and inconsistencies in the consolidation of build material.
Innovation Solution
The use of oscillating energy beam paths allows for the consolidation of thin walls with a single pass, where the energy beam wobbles to create a larger melt pool, achieving a thickness greater than the beam diameter without the need for additional passes, thereby promoting uniformity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple energy beam passes are used to consolidate thin walls, then wall thickness uniformity is improved, but processing time increases and productivity decreases
Solution Approach 1:
The energy beam path is made dynamic through oscillation rather than following a static straight line. The beam oscillates perpendicular to the scan direction, creating a meandering pattern that distributes energy more effectively across the wall thickness, achieving uniform consolidation in a single pass without requiring multiple sequential passes
Solution Approach 2:
The energy beam applies periodic oscillation at specific frequencies to create controlled melting and solidification cycles. This periodic action ensures uniform heat distribution throughout the wall thickness, achieving consistent wall properties without requiring multiple passes, thereby maintaining high processing speed
2Manufacturing precision
If multiple energy beam passes are used to fill wall interior, then consolidation quality is improved, but device complexity and process complexity increase
Solution Approach 1:
The oscillation pattern merges the functions of multiple passes into a single continuous pass. By combining the edge consolidation and interior filling operations into one oscillating beam path, the process eliminates the need for separate passes and complex hatching patterns, reducing process complexity while maintaining consolidation quality
Solution Approach 2:
The oscillation amplitude and frequency are segmented or modulated along the scan path to adapt to different wall thickness regions. This allows the single pass to automatically adjust energy distribution, providing adequate consolidation for both thin and thick sections without requiring multiple passes with different parameters
3Manufacturing precision
If oscillating energy beam paths are used, then wall thickness uniformity is improved, but energy consumption increases
Solution Approach 1:
The oscillation parameters (amplitude, frequency, and waveform) are optimized and tuned to achieve the minimum effective energy input required for uniform wall consolidation. By carefully selecting these parameters, the system achieves precise wall thickness control without excessive energy consumption that would result from arbitrary or overly aggressive oscillation patterns
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 manufacturing of thin, uniform walls with improved precision and speed, reducing the need for hatching patterns and minimizing potential solidification inconsistencies, thus enhancing the additive manufacturing process.
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
one or more energy beams are directed onto a powder bed to melt, fuse, or sinter sequential layers of build material
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A method (300) of additively manufacturing a three-dimensional object (114) includes irradiating a first build plane region (152a) using a first energy beam (134a) defining a beam diameter (DB), the first energy beam travelling along a first oscillating path (190) in a first direction (D1) to consolidate a first wall (153a) defining a thickness perpendicular to the first direction D1, wherein a build material (118) adjacent a first side (157a) of the first wall (153a) and the build material (118) adjacent a second side (159a) of the first wall (153a), opposite the first side (157a) of the first wall (153a), remains unconsolidated, and wherein the first oscillating path (190) comprises a first plurality of oscillations (192) that define at least the first side (157a) of the first wall (153a), and wherein the thickness (T) of the first wall (153a) is greater than the beam diameter (DB).