AM Powder Degradation Prediction Using Encased Powder Containers
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Solution Overview
Problem
In additive manufacturing, powder degradation due to oxidation and heat exposure affects the quality of built articles, making it challenging to optimize powder reuse and build operations effectively.
Innovation Solution
Building containers within the additive manufacturing process that encase unfused powder, allowing for analysis of degradation caused by different structural features, enabling prediction of powder degradation rates and optimizing powder usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If powder is reused in multiple build operations, then productivity is improved, but powder degradation increases
Solution Approach 1:
The patent performs preliminary characterization of structural features in the article design before manufacturing. This allows prediction of powder degradation effects before the build operation, enabling proactive adjustment of powder reuse strategies. By analyzing the article's structural features (thin walls, thick walls, downward-facing surfaces) in advance, the system can estimate degradation rates and determine optimal powder recycling limits, thus maintaining powder quality while maximizing productivity.
2Productivity
If build operations are extended to maximize powder usage, then productivity is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the characterized structural features of articles are used to predict powder degradation rates. This prediction feeds back into the powder management system, which adjusts powder reuse decisions based on the anticipated degradation. The system continuously monitors and adjusts powder usage strategies based on actual degradation outcomes from previous builds, ensuring manufacturing precision is maintained while maximizing productivity.
3Manufacturing precision
If powder recycling is limited to maintain quality, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent changes the parameters used to determine powder reuse limits from simple cycle-counting to a more nuanced approach based on characterized structural features and predicted degradation rates. By incorporating parameters such as the proportion of thin-walled sections, thick-walled sections, and downward-facing surfaces in articles, the system can more accurately predict powder degradation and set optimal reuse limits. This allows maximum powder utilization while maintaining quality standards.
4Manufacturing precision
If comprehensive powder analysis is performed to determine degradation, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent creates a simplified model or copy of the degradation process through characterization of structural features. Instead of performing complex physical analysis on powder after each build, the system uses the article's structural characteristics as a proxy to predict degradation. This virtual model allows accurate degradation assessment without requiring complex analytical equipment or procedures, thus maintaining manufacturing precision while reducing device complexity.
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
Enables accurate prediction of powder degradation, allowing for optimized powder reuse and improved build operations by determining the effect of structural features on powder quality, thus enhancing the efficiency and quality of additive manufacturing processes.
Implementation Method 1
The machine deposits a layer of powder on a build platform and the powder is subsequently selectively fused or otherwise solidified, typically with a laser or electron beam, to form an article or articles
Implementation Method 2
The machine deposits a layer of powder on a build platform and the powder is subsequently selectively fused or otherwise solidified, typically with a laser or electron beam, to form an article or articles
Implementation Method 3
During a build operation unfused powder is subject to degradation. A metal powder may gradually oxidise, for example, which alters its properties and thus those of an article produced from the powder
Data Source
AI summary
A method of additive manufacture involves building a container 8 and a structure by fusing powder 12, 13, 14, such that the container contains the structure and unfused powder. The container 8 may be used in a method for predicting powder degradation in an additive manufacturing process. Containers containing different types of structure may be built to measure the effect of building different types of structures on powder degradation. A structure to be built may be characterised by classes of structural features it contains and information obtained used from building containers used to predict how building the structure will degrade powder.