Additive Manufacturing Particle Separator for Surface Finish Control
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Solution Overview
Problem
Traditional additive manufacturing systems face challenges in producing workpieces with smooth surfaces and varying material compositions, leading to issues like porosity, melt ball formations, and uncontrolled surface coarseness, which require additional machining steps and cannot effectively manage internal stresses.
Innovation Solution
The method involves selecting layers of a workpiece, separating them into regions, and depositing different particle types for varying surface finishes and material densities, using a particle separator to control the flow of particles and an energy gun for melting, allowing for region-by-region fabrication with specific surface and material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional additive manufacturing systems use uniform particle deposition, then the manufacturing process is simple, but the surface finish is coarse and material composition cannot be controlled
Solution Approach 1:
The patent segments the particle supply system into multiple hoppers, each containing particles of different sizes or compositions. A particle separator divides the particle stream into multiple channels, allowing different particle types to be deposited in different regions of the same layer. This segmentation enables control over surface finish and material composition without requiring entirely different manufacturing systems.
Solution Approach 2:
The patent implements local quality by enabling different regions of a workpiece to receive different particle types. Small particles are deposited in regions requiring smooth surfaces, while large particles are deposited in regions where rougher surfaces are acceptable. This local differentiation allows optimization of surface finish and material properties in specific areas without affecting the entire workpiece.
2Manufacturing precision
If additional machining steps are used to improve surface finish, then surface quality improves, but manufacturing time and cost increase
Solution Approach 1:
The patent applies preliminary action by controlling particle size and composition during the additive manufacturing deposition process itself, rather than relying on post-manufacturing machining. By selecting appropriate particle sizes before deposition (small particles for smooth surfaces, large particles for rougher surfaces), the system achieves desired surface finishes directly during fabrication, eliminating or reducing the need for subsequent machining operations.
3Reliability
If material composition is varied in different regions, then internal stresses are better managed, but the system complexity increases
Solution Approach 1:
The patent enables local quality in material composition by allowing different hoppers to contain particles with different compositions or properties. The particle separator and controlled deposition system deliver specific particle types to specific regions, enabling variation in material composition throughout the workpiece. This allows optimization of mechanical properties, such as stress resistance, in different areas of the workpiece based on local requirements.
4Ease of manufacture
If uniform particles are used throughout the workpiece, then the manufacturing process is simple, but porosity and material defects increase
Solution Approach 1:
The patent applies parameter changes by varying particle size and composition parameters across different regions of the workpiece. Instead of using uniform particles, the system adjusts particle characteristics (size, material type) based on regional requirements. This enables optimization of material quality, reducing porosity and defects in critical areas while maintaining process control through the particle separator and multi-hopper system.
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 enables the creation of workpieces with varying material compositions and densities, reducing internal stresses and improving surface finishes, thus enhancing the efficiency and quality of additive manufacturing, particularly in complex components like turbine blades.
Implementation Method 1
separating the mixed powder into the plurality of particle types by weight ranges utilizing a particle separator; entraining a mixed powder in an airflow of the particle separator
Implementation Method 2
melting the regions having the plurality of particle types; a laser gun melts the layer
Implementation Method 3
an electron beam gun melts the layer
Implementation Method 4
The principle behind additive manufacturing processes involves the selective melting of atomized precursor powder beds by a directed energy source
Implementation Method 5
The melting of the powder occurs in a small localized region of the energy beam, producing small volumes of melting, called melt pools, followed by rapid solidification
Data Source
AI summary
A workpiece manufactured from an additive manufacturing system (AMS) having a particle separator and a method of operating includes modeling the workpiece into layers and modeling the layers into a plurality of regions. The AMS then deposits one of a plurality of particle types into a respective one of the plurality of regions. In this way, the surface finishes of the component may be controlled and material densities from one region to the next and from one layer to the next are also controlled.