Additive Manufacturing Powder Size Control for Shape Accuracy
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Solution Overview
Problem
Existing additive manufacturing methods, particularly 3D printing, suffer from minor deviations in product shape and structure due to inconsistent powder materials, leading to cavities and reduced integrity and stability, which are often corrected through costly post-processing steps.
Innovation Solution
The use of a powder material with controlled particle size distribution, specifically limiting the variation of particle sizes to enhance homogeneity, with at most 25% deviation from D50, and optimizing the particle size range for 3D printing processes, particularly using spherical particles, reduces deviations and improves process reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional powder materials with wide particle size distribution are used, then material availability and ease of manufacture are improved, but manufacturing precision and product shape accuracy deteriorate due to deviations and cavities
Solution Approach 1:
The patent applies parameter changes by strictly controlling the particle size distribution parameters of the powder material. Specifically, it limits particles with size deviation >20% from D50 to at most 25 wt.-% and optimizes the D50 range to 15-50 μm. This parameter control transforms the powder material from conventional wide distribution to a narrowly controlled distribution, resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
The patent applies local quality by differentiating particle size control at different stages. It separately specifies requirements for particles smaller than D50 (at most 25 wt.-%) and particles larger than D50 (at most 25 wt.-%), with further preference for reducing smaller particles to at most 15 wt.-%. This localized control of particle quality ensures optimal packing and melting behavior, improving manufacturing precision while maintaining material availability.
2Device complexity
If conventional powder materials are used, then process simplicity is maintained, but product integrity and stability deteriorate due to enclosed cavities and deviations
Solution Approach 1:
The patent applies preliminary action by pre-controlling the particle size distribution before the additive manufacturing process. By limiting particles with size deviation >20% from D50 to at most 25 wt.-% and optimizing the overall distribution, the powder material is prepared in advance to prevent cavity formation and shape deviations during manufacturing. This preliminary control of material quality ensures product integrity without adding complexity to the manufacturing process.
3Manufacturing precision
If post-processing steps are implemented to correct deviations, then product quality is improved, but productivity and manufacturing efficiency deteriorate
Solution Approach 1:
The patent applies preliminary anti-action by preventing shape deviations and cavities from occurring in the first place through strict particle size control. By limiting particles with size deviation >20% from D50 to at most 25 wt.-% and optimizing the D50 range to 15-50 μm, the powder material is pre-conditioned to ensure accurate melting and solidification. This prevents the need for post-processing corrections, thereby maintaining high productivity while ensuring excellent product quality.
Data Source
AI summary
A powder material for additive manufacturing providing an improved microstructure and shape of a product including particles, wherein at most 25 wt.-% of the particles provide a particle size differing more than 20% from the D50 based on the value of the D50. A method of additive manufacturing includes the step of manufacturing a product from this powder material or repairing a product utilizing this powder material.