3D Powder Bed Outer Edge Structure for Overflow Powder Collection
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Solution Overview
Problem
Conventional three-dimensional fabricating apparatuses face challenges in efficiently collecting excess powder from the outer edge of the fabrication chamber, leading to structural complexity, increased costs, and reduced fabrication quality due to roller banding and the need for additional suction devices.
Innovation Solution
The apparatus features a fabrication chamber with an outer edge having a single bottom surface and no groove, utilizing a flattener to distribute powder and a collector to efficiently gather excess powder directly into the chamber, preventing accumulation and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is provided beside the fabrication chamber to collect excess powder, then powder collection is enabled, but the structure becomes complex and costs increase
Solution Approach 1:
The invention extracts the powder collection function from a separate groove structure and integrates it into the outer edge portion of the fabrication chamber itself. The outer edge portion serves dual purposes: maintaining chamber integrity and collecting excess powder through its specific geometric design with a bottom surface positioned lower than the fabrication stage.
Solution Approach 2:
The outer edge portion of the fabrication chamber is designed to perform multiple functions simultaneously: it serves as the structural boundary of the chamber and as the powder collection mechanism. This multi-functional design eliminates the need for separate collection structures, reducing overall device complexity.
2Reliability
If additional suction devices and rollers are used to collect excess powder, then powder collection is achieved, but manufacturing costs increase
Solution Approach 1:
The fabrication chamber structure serves itself by incorporating the powder collection function directly into its outer edge portion. The geometric design of the outer edge with a lower bottom surface automatically guides and collects excess powder without requiring additional active collection mechanisms, reducing manufacturing costs.
3Quantity of substance
If excess powder accumulates in a groove, then collection is facilitated, but roller banding occurs and fabrication quality reduces
Solution Approach 1:
Instead of creating a groove that causes powder to accumulate and potentially cause roller banding, the invention inverts the approach by designing the outer edge portion with a bottom surface that actively directs powder back into the fabrication stage. This reverse flow prevention ensures excess powder does not accumulate in problematic locations.
4Quantity of substance
If a groove structure is used for powder collection, then powder can be gathered, but the apparatus requires additional collection mechanisms increasing complexity
Solution Approach 1:
The invention merges the powder gathering function with the existing outer edge portion structure of the fabrication chamber. By combining these functions into a single integrated structure, the apparatus complexity is reduced while maintaining effective powder collection capability.
Data Source
AI summary
There is provided a method of fabricating a three-dimensional object. The method includes supplying, flattening, and collecting. The supplying supplies, with a powder supplier, powder to a fabrication chamber. The fabrication chamber includes a fabrication stage to store powder and an outer edge portion outside the fabrication stage, the outer edge portion having one bottom surface. The flattening flattens, with a flattener, the powder supplied by the supplying. The collecting collects, with a powder collector, the powder having overflowed from the fabrication stage to the outer edge portion by the flattening into the fabrication stage.