Vector Scanning for Additive Manufacturing Edge Smoothing
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Solution Overview
Problem
Additive manufacturing processes often result in rough contoured edges due to the termination of parallel scan lines, requiring post-production finishing and potentially leading to sub-surface porosity and geometry mismatches.
Innovation Solution
A method and apparatus that apply an energy beam with a vector scanning pattern along contoured edges, dynamically controlling energy beam intensity, scanning speed, and focus depth as a function of the angle between parallel lines and the vector, to liquefy and re-solidify material, smoothing the edges and controlling the melt pool size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If parallel scan lines are used to form layers in additive manufacturing, then manufacturing efficiency is improved, but contoured edges become rough and require post-processing
Solution Approach 1:
The patent applies vector scanning along contoured edges before final raster scanning to pre-smooth edges and prevent roughness formation. By performing the edge smoothing action in advance, the need for post-processing is eliminated while maintaining manufacturing efficiency.
Solution Approach 2:
The patent divides the scanning process into two distinct segments: vector scanning along contoured edges and raster scanning for bulk material deposition. This segmentation allows each scanning mode to be optimized independently, with vector scanning handling edge quality and raster scanning handling manufacturing efficiency.
2Manufacturing precision
If vector scanning is applied along contoured edges to smooth them, then edge quality is improved, but sub-surface porosity and geometry mismatches occur
Solution Approach 1:
The patent dynamically adjusts vector scanning parameters (speed, power, hatching pattern) based on the specific contoured edge geometry and material characteristics. This dynamic adaptation prevents excessive energy input that could cause porosity while maintaining sufficient energy to smooth edges effectively.
Solution Approach 2:
The patent changes multiple scanning parameters including vector scan speed, vector scan power, hatching distance, and hatching angle to optimize both edge quality and internal structure integrity. By carefully controlling these parameters, the process achieves smooth edges without creating sub-surface porosity or geometry mismatches.
3Manufacturing precision
If post-production finishing is applied to smooth contoured edges, then edge quality is improved, but additional time and processing steps are required
Solution Approach 1:
The patent performs edge smoothing during the additive manufacturing process itself through vector scanning, eliminating the need for separate post-processing steps. By incorporating the smoothing function into the manufacturing process, time is saved without compromising edge quality.
Solution Approach 2:
The patent merges the edge smoothing function with the additive manufacturing process by applying vector scanning along contoured edges during layer deposition. This combination eliminates the need for separate post-processing operations, reducing total manufacturing time while maintaining edge quality.
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 effectively smooths contoured edges, reduces post-processing requirements, and minimizes sub-surface porosity, resulting in a more precise and robust finished article.
Implementation Method 1
an energy beam is also applied with a vector scanning pattern at the build location along the contoured edge to liquefy and re-solidify material at the build location along the contoured edge
Implementation Method 2
fusing a fusible material with an energy beam applied to the fusible material at a build location
Data Source
AI summary
A method of making an article is disclosed in which a fusible material is fused with an energy beam applied to the fusible material at a build location with a scanning pattern comprising a plurality of parallel lines terminating at the contoured edge. An energy beam is also applied with a vector scanning pattern at the build location along the contoured edge to liquefy and re-solidify material at the build location along the contoured edge. The method also includes controlling vector scanning energy beam intensity, vector scanning energy beam scanning speed, vector scanning energy beam focus depth, or any combination thereof as a function of an angle between the plurality of parallel lines and the vector along the contoured edge.