Powder Bed Additive Manufacturing With Synchronized Fume Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing additive manufacturing methods, particularly L-PBF, face issues with process robustness due to interactions between fumes and energy sources, condensate deposits, weld-spatter, and irregularities in the powder bed, leading to inconsistent quality and increased maintenance, while productivity is hindered by exposure parameters and dead times.
Innovation Solution
Integration of feed, application, and discharge means in a movable assembly within the process chamber, synchronized by a common control unit, to minimize condensate deposits, extract fumes and weld-spatter efficiently, and optimize powder bed properties, allowing for a compact and efficient manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fumes are extracted locally close to the region of action, then process robustness is improved, but the extraction system becomes more complex and maintenance effort increases
Solution Approach 1:
The extraction system is segmented into multiple extraction units that can be distributed along the application means. Each extraction unit handles a specific region, allowing localized fume extraction close to the region of action while distributing the complexity across modular components rather than a single complex extraction system
Solution Approach 2:
The extraction units are arranged in the longitudinal direction along the application means, adding a spatial dimension to the extraction approach. This allows fumes to be extracted at multiple positions along the processing path, improving process robustness through distributed extraction points
2Productivity
If the application means and discharge means are integrated in a movable assembly, then productivity is improved by reducing dead time, but device complexity increases
Solution Approach 1:
The application means and discharge means are merged into a single movable assembly that can be moved together as one unit. This integration eliminates the dead time between powder application and fume extraction operations, as both functions are performed in sequence without repositioning operations, directly improving productivity
Solution Approach 2:
The movable assembly serves multiple functions: it applies powder layers, extracts fumes, and can be synchronized with the energy source movement. This multi-functionality consolidates several operations into a single integrated unit, improving throughput while managing complexity through functional integration
3Ease of manufacture
If weld-spatter is removed only partially by sieving, then powder bed processing is simplified, but component quality deteriorates due to contamination
Solution Approach 1:
The discharge means extracts fumes and weld-spatter immediately after the laser processing step, before the powder is reused in subsequent layers. This preliminary removal of contaminants prevents accumulation of weld-spatter in the powder bed, maintaining component quality without requiring complex post-processing sieving operations
Solution Approach 2:
The extraction system converts the harmful effect of weld-spatter accumulation into a benefit by actively removing contaminants during the manufacturing process. This transforms the problem of weld-spatter contamination into an opportunity for real-time quality control, maintaining both manufacturing simplicity and component quality
4Productivity
If layer time is reduced to improve productivity, then manufacturing throughput increases, but process robustness may deteriorate due to insufficient fume extraction
Solution Approach 1:
The discharge means operates continuously or in close synchronization with the application means and energy source, ensuring that fume extraction is performed continuously throughout the layer formation process. This continuous extraction maintains process robustness even at higher speeds by preventing fume accumulation and laser-fume interactions that would compromise quality
Solution Approach 2:
The system uses synchronized control of the application means and discharge means based on the movement of the energy source. This feedback mechanism ensures that extraction is appropriately timed and positioned relative to the laser processing, maintaining process robustness while enabling faster layer formation through optimized coordination
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
Enhances process robustness by minimizing contamination and maintenance, reduces layer time, and improves productivity through synchronized operation, enabling high-quality and cost-effective production of three-dimensional objects.
Implementation Method 1
the metal powder is melted, that is to say brought from the solid to the liquid aggregate state
Implementation Method 2
The metal powder is melted, that is to say brought from the solid to the liquid aggregate state
Implementation Method 3
a means of action for specifically allowing energy to act on selected reaction regions of the applied powder layer in order to fuse the pulverulent build material
Data Source
AI summary
The invention relates to a device and a method for the additive manufacturing of a three-dimensional object made of a powder build material, the device and method making it possible for the supply of build material and the distribution of the build material by means of the application means and/or the removal of reaction by-products to be synchronised. Preferably, the action means is also synchronised with the supply and removal processes. This optimises the machining process in terms of time and location as well as process robustness.