Additive Manufacturing Gas Flow Control for Impurity Removal
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Solution Overview
Problem
Existing additive manufacturing methods face challenges in maintaining manufacturing precision and quality due to impurities like splashes, fumes, and vapors produced during the selective solidification of building materials, which can disrupt the laser beam and affect the quality of the three-dimensional objects produced.
Innovation Solution
A control method that manages the solidification process by determining and controlling the gas flow directions across the build area, allowing for non-aligned gas flow patterns to prevent impurities from interfering with the solidification process, thereby improving manufacturing precision and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a gas flow is directed through the building chamber to remove impurities, then the quality of the manufactured object is improved, but the complexity of controlling the gas flow directions increases
Solution Approach 1:
The build area is divided into multiple areas, each with its own reference flow direction. The gas flow control is segmented into multiple directional components rather than using a single uniform flow, allowing precise control of impurity removal in different regions while managing overall system complexity.
Solution Approach 2:
Different reference flow directions are assigned to different areas of the build area based on local requirements. Each area receives gas flow optimized for its specific needs, with the solidification device controlled in dependence on the local reference flow direction, thereby improving manufacturing precision locally without requiring complete system redesign.
2Manufacturing precision
If the scanning direction of the laser beam is adapted to the main flow direction of the gas flow, then the angle between the two directions can be optimized, but the flexibility in selecting solidification directions is reduced
Solution Approach 1:
The build area is divided into multiple areas, each with its own reference flow direction. This segmentation allows the laser scanning direction to be optimized for each local area independently, maintaining angle optimization benefits while preserving overall flexibility through area-specific control.
Solution Approach 2:
The reference flow directions are determined dynamically based on the actual gas flow conditions in each area. This dynamic adaptation allows the system to maintain optimal angles between laser scanning and gas flow while accommodating varying flow patterns, thereby preserving flexibility.
3Object-generated harmful factors
If multiple gas flow directions are used to cover the entire build area, then the removal of impurities is improved, but the control complexity of the solidification device increases
Solution Approach 1:
Each area of the build area is assigned a specific reference flow direction based on local impurity removal needs. The solidification device control is simplified by using these pre-determined reference directions as the basis for each area, rather than requiring complex real-time adjustments across the entire build area.
Solution Approach 2:
The system uses the naturally occurring multi-directional gas flow patterns and determines reference flow directions based on actual flow conditions. This self-organizing approach reduces control complexity by leveraging the existing flow structure rather than requiring external complex control mechanisms.
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 the homogeneity and mechanical properties of the manufactured objects by effectively managing gas flow directions, reducing the impact of impurities and improving the structural integrity of the products.
Implementation Method 1
the building material in each layer is selectively solidified by a selective irradiation of positions corresponding to a cross-section of the object to be manufactured with a laser beam
Implementation Method 2
In order to remove them from the building chamber, a gas flow may be directed through the building chamber
Data Source
AI summary
A control method serves for controlling at least one solidification device of an additive manufacturing device for manufacturing a three-dimensional object by means of an additive layer build method in which at least one object is manufactured by repeated application of a layer of a building material to a build area and by selective solidification of the applied layer at positions corresponding to a cross-section of the object to be manufactured, wherein a gas having a plurality of flow directions which essentially are not aligned in the same direction flows across the build area. The method includes receiving and/or determining a distribution of the flow directions of the gas above the build area, assigning a reference flow direction to an area of the build area in dependence on the distribution of the flow directions above the area, controlling the solidification device to solidify at least a part of the cross-section of the object to be produced in dependence on a reference flow direction above the area of the build area in which the respective part of the cross-section is positioned.