Additive Manufacturing Support Bridge for Overhang Separation
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Solution Overview
Problem
Additive layer manufacturing methods face challenges in producing components with overhangs greater than 45 degrees, requiring support structures that are time-consuming and costly to remove, leading to rough surface finishes due to manual or machine-based processes and the need for subsequent machining to remove witness lines.
Innovation Solution
A method where a support structure is formed below overhangs using consolidated powder material, with a void of unconsolidated powder spacing it from the component, allowing a bridge portion to be formed between the overhang and support structure, facilitating easy separation and improving surface finish by limiting powder sintering volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If support structures are used to enable overhangs greater than 45 degrees, then the component geometry capability is improved, but the post-build processing time and cost increase significantly
Solution Approach 1:
The invention extracts and removes the support structures from the final component by forming a bridge portion that allows easy separation. The bridge portion is formed by melting through the unconsolidated powder layer, creating a controlled failure point that enables rapid removal of support structures without complex machining operations.
Solution Approach 2:
The invention performs preliminary action by forming the bridge portion during the additive manufacturing process itself, rather than requiring post-build processing. The bridge portion is created by melting through the unconsolidated powder layer in the support structure, preparing the component for easy separation before the manufacturing process completes.
2Ease of manufacture
If manual or machine tools are used to remove support structures, then the support structure removal is achieved, but the surface finish deteriorates due to rough removal and witness lines
Solution Approach 1:
The invention converts the harmful effect of the unconsolidated powder layer into a beneficial feature. The unconsolidated powder, which would normally create rough surfaces and witness lines, is instead used to form a bridge portion that enables easy support structure removal. The bridge portion is formed by melting through this powder layer, creating a clean separation interface that preserves surface finish.
3Strength
If a consolidated support structure is used, then the structural support is improved, but the powder sintering volume increases leading to rougher surface finish
Solution Approach 1:
The invention applies local quality by creating different material states in different regions. The support structure uses consolidated powder material for structural strength, while the bridge portion uses unconsolidated powder material that is selectively melted to form a separation interface. This local differentiation allows the support structure to provide strength while the bridge portion enables easy removal without excessive sintering.
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 the production of complex components with reduced post-build processing time and cost, and improved surface finish by allowing easy separation of support structures and minimizing powder sintering on the component surface.
Implementation Method 1
Powder bed ALM methods construct components layer by layer by depositing powder on a base plate and then selectively consolidating the powder using a laser or other heat source
Implementation Method 2
forming at least one bridge portion of consolidated material bridging the overhang of the component and the support structure
Data Source
Figure 1~2
Figure 3~4
AI summary
The present disclosure relates to a method of manufacturing a component (e.g. a component having an overhang) by additive layer manufacturing. The method comprises forming the component and at least one support structure by consolidating consecutive layers of deposited powder material using a heat source. The component and the support structure are at least partially spaced by a void containing unconsolidated powder material. The void may be bridged by bridge portions of consolidated powder material equally spaced along the void.