Hybrid Additive Manufacturing With Preform Structures
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Solution Overview
Problem
Current metal additive manufacturing processes face challenges in controlling geometries such as downward-facing surfaces and internal passages, leading to rough surfaces and defects that impede fluid flow and compromise high-cycle fatigue properties, often requiring secondary processing and increasing production time and cost.
Innovation Solution
The system employs preform structures secured to a build platform, with a powder deposition device and energy source to deposit and fuse metallic powder, allowing for the formation of complex geometries and high-strength components by avoiding deposition on internal surfaces and using retractable conveyor belts or biaxial gantry systems for precise powder distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional metal additive manufacturing processes are used to form downward-facing surfaces and internal passages, then the component can be produced, but the surface quality deteriorates with rough surfaces and defects
Solution Approach 1:
The build platform is segmented into multiple independently controllable zones (first build zone, second build zone, third build zone) that can be selectively heated and cooled. This allows different thermal conditions to be applied to different regions, enabling precise control over powder deposition and fusion in downward-facing surfaces and internal passages without affecting the entire build area, thus improving surface quality while maintaining manufacturing feasibility
Solution Approach 2:
The system dynamically adjusts the thermal state of the build platform by selectively heating and cooling different zones during the additive manufacturing process. The build platform transitions between different thermal conditions (heated state, cooled state, partially heated/cooled) to optimize powder deposition and fusion characteristics for specific geometries, thereby improving surface quality and reducing defects in challenging areas
2Manufacturing precision
If secondary processing is applied to finish downward-facing and internal surfaces, then surface quality improves, but production time increases
Solution Approach 1:
The system performs preliminary thermal conditioning of the build platform zones before powder deposition in downward-facing surfaces and internal passages. By pre-heating or pre-cooling specific zones, the powder achieves optimal fusion characteristics during deposition, producing smooth surfaces with good quality directly from the additive process, thereby eliminating or reducing the need for subsequent secondary processing operations
3Reliability
If secondary processing is applied to refine surfaces, then high-cycle fatigue properties improve, but production time increases
Solution Approach 1:
The system applies preliminary thermal control to build platform zones during powder deposition, ensuring optimal fusion and minimizing defects in downward-facing surfaces and internal passages. This preliminary thermal conditioning produces surfaces with improved integrity and reduced defects that directly enhance high-cycle fatigue properties, reducing or eliminating the need for time-consuming secondary processing while maintaining reliability
Solution Approach 2:
The invention replaces mechanical secondary processing operations (such as machining or polishing) with a thermal field-based approach during the additive manufacturing process. By using controlled heating and cooling of build platform zones, the system achieves surface refinement and defect reduction through thermal management rather than mechanical removal, thereby improving high-cycle fatigue properties without extending production time
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 method enables the fabrication of hybrid components with improved surface finishes and mechanical properties, reducing the need for secondary processing and enhancing production efficiency by directly forming complex geometries within the additive manufacturing process.
Implementation Method 1
an energy source is used to rapidly and locally fuse the powder. The metal solidifies into successive layers
Implementation Method 2
successive layers of metallic powder are deposited over and/or around the preform by a powder deposition device
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
An additive manufacturing system (10; 110) for fabricating a hybrid component includes a build platform (12; 112) having a platform surface (24; 124) at a first elevation and at least one preform structure (14, 16; 114) secured proximate to the build platform (12; 112). The preform structure (14, 16; 114) includes a first preform surface (30, 34; 130) located at a second elevation. The system (10; 110) further includes a powder deposition device (20; 120) disposed above the build platform (12; 112) at a third elevation (E), the third elevation (E) being greater than the first and second elevations.