3D Powder Bed Fusion Imaging Control for Faster Electron Detection
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Solution Overview
Problem
Conventional three-dimensional powder bed fusion additive manufacturing (PBF-AM) processes are inefficient due to the need to scan the entire meltable area with a primary ray to acquire backscattered electrons, leading to prolonged manufacturing times and reduced throughput.
Innovation Solution
A three-dimensional PBF-AM apparatus and method that controls the irradiation device to selectively irradiate only a predetermined range within the powder layer with a primary ray, using a control unit to optimize the irradiation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the entire meltable area is irradiated with a primary ray to acquire backscattered electrons, then the detection of product state is enabled, but the manufacturing time increases and throughput decreases
Solution Approach 1:
The patent divides the irradiation area into segments: the entire meltable area is scanned during the melting process to ensure complete coverage, but only a predetermined partial area (region of interest) is irradiated when acquiring backscattered electron images. This segmentation allows the system to maintain detection capability while reducing the time-consuming full-area scanning during imaging operations.
Solution Approach 2:
The patent applies partial action by irradiating only a predetermined partial area rather than the entire meltable area when acquiring backscattered electron images. This partial irradiation is sufficient to detect the product state in the region of interest while avoiding the time penalty of scanning the entire area, thus improving throughput without sacrificing essential detection capability.
2Loss of information
If the entire meltable area is scanned with a primary ray to acquire backscattered electrons, then complete product information is obtained, but the acquisition time is prolonged
Solution Approach 1:
The patent applies local quality by focusing the irradiation on a predetermined partial area (region of interest) rather than uniformly scanning the entire meltable area. This localized approach concentrates the detection effort on the most critical regions where product state information is most needed, reducing acquisition time while maintaining sufficient information quality for process monitoring.
Solution Approach 2:
The patent uses partial action by irradiating only a predetermined partial area to acquire backscattered electrons. This partial irradiation captures essential product information in the region of interest without the time cost of complete area scanning, effectively balancing information completeness with acquisition speed.
3Productivity
If a predetermined partial area is irradiated with a primary ray, then the throughput is improved, but the irradiation coverage is reduced
Solution Approach 1:
The patent segments the irradiation process into two distinct phases: (1) complete area scanning during melting to ensure full coverage and process safety, and (2) partial area irradiation during imaging to improve throughput. This segmentation allows the system to maintain adequate coverage where necessary while reducing irradiation area where it enhances productivity.
Solution Approach 2:
The patent implements periodic action by alternating between complete area scanning (during melting operations) and partial area irradiation (during imaging operations). This periodic switching between full and partial coverage allows the system to maintain process integrity while improving overall throughput through reduced irradiation time during imaging phases.
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 enhances manufacturing throughput by reducing the time required to acquire backscattered electron images and improves image resolution, while minimizing unnecessary irradiation.
Implementation Method 1
The irradiation device irradiates the powder layer with a primary ray
Implementation Method 2
detects electrons generated when the powder material is irradiated with the primary ray
Data Source
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AI summary
A three-dimensional powder bed fusion additive manufacturing (PBF-AM) apparatus (1) includes a build plate (22), a powder supply device (16), a beam irradiation device (2), a plurality of detection units (46), and a control unit (104). The control unit (104) controls the irradiation device (2). In addition, when acquiring electrons, the control unit (104) controls the irradiation device (2) in a manner that only a predetermined irradiation range in the powder layer is irradiated with the primary ray.