Build Platform with Sacrificial Barrier for Additive Manufacturing
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Solution Overview
Problem
Conventional powder bed additive manufacturing requires large support structures for heat dissipation, leading to thermal distortion and lengthy processing times, with inefficient separation and significant material waste due to the need for stress-relieving and machining to remove these structures.
Innovation Solution
A build platform with a sacrificial non-metallic barrier layer and removable anchors allows for controlled heat dissipation and reduced thermal distortion, enabling direct construction and easy separation of near-net shape components without the need for complex support structures, using a powder bed deposition apparatus that selectively applies energy beams to form layers on a removable powder bed working surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If large support structures are used for heat dissipation, then thermal distortion is reduced, but device complexity and material waste increase
Solution Approach 1:
The patent extracts the heat dissipation function from traditional large support structures and concentrates it into small anchor pins with high thermal conductivity. This removes the complex support structures while maintaining effective heat management through the anchors that are directly coupled to the build plate.
Solution Approach 2:
Instead of using uniform support structures across the entire build plate, the patent applies localized high thermal conductivity anchors at specific positions where heat dissipation is most needed. This provides targeted heat management with minimal material and structural complexity.
2Temperature
If large support structures are used for heat dissipation, then thermal distortion is reduced, but processing time increases
Solution Approach 1:
The patent removes the time-consuming stress-relieving and machining steps associated with large support structures by extracting the heat dissipation function to small anchors. This eliminates post-processing time while maintaining thermal control during building.
Solution Approach 2:
The anchor pins are pre-installed on the build plate before additive manufacturing begins, establishing heat dissipation pathways in advance. This preliminary arrangement prevents thermal distortion during building without requiring subsequent stress-relieving operations.
3Temperature
If large support structures are used for heat dissipation, then thermal distortion is reduced, but material waste increases
Solution Approach 1:
The patent extracts the heat dissipation function from material-intensive support structures and implements it through minimal anchor pins. This dramatically reduces the amount of support material required while maintaining effective thermal management.
Solution Approach 2:
The patent applies high thermal conductivity material locally at anchor pin positions rather than throughout entire support structures. This localized application of premium material achieves superior heat dissipation with minimal overall material consumption.
4Temperature
If complex support structures are used, then heat dissipation is improved, but ease of separation deteriorates
Solution Approach 1:
The patent extracts the heat dissipation function from complex, difficult-to-remove support structures and concentrates it in small anchor pins. These simplified anchors are easily separated from the built part after manufacturing, eliminating the complexity of support structure removal.
Solution Approach 2:
The patent segments the heat dissipation function into discrete, separable anchor pins rather than using monolithic support structures. This segmentation allows the anchors to be independently removed from the built part without affecting the integrity of the manufactured component.
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 reduces thermal distortion, minimizes processing time, and decreases material waste by allowing for straightforward separation and machining of near-net shape components with improved build quality.
Implementation Method 1
electron beam selectively melts powder to form each layer; laser, and direct metal deposition. Powder-based processes typically involve rapid heating and solidification as the energy beam is passed over the powder
Implementation Method 2
Support structures, such as a heat sink, honeycomb, and/or anchors have been fused to an upper surface of a thick metal build table, to dissipate heat and prevent distortion of the component
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
A powder bed deposition apparatus comprises a movable build plate, a powder delivery system, an energy beam apparatus capable of selectively steering at least one focused energy beam over successive quantities of metal powder, a non-metallic barrier layer, and an anchor removably secured to the build plate. The non-metallic barrier layer is disposed over a metal upper surface of the build plate. The anchor has a metal bonding surface flush with the non-metallic barrier layer, the non-metallic barrier layer and the anchor defining a removable build assembly with a powder bed working surface.