Additive Manufacturing Support Placement via Frequency Analysis
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Solution Overview
Problem
Additive manufacturing (AM) parts often require post-processing to improve surface finish, but they must withstand applied forces during these processes, and existing methods do not effectively address structural integrity and surface roughness issues.
Innovation Solution
Perform frequency analysis on computer-generated designs to calculate mode shapes and static compliance, identifying areas needing structural supports, adding material for support during manufacturing, and removing it post-processing to enhance structural integrity and surface finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If structural supports are added to AM parts to withstand post-processing forces, then structural integrity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing frequency analysis and mode shape calculations on the computer-generated design before manufacturing. This allows identification of critical areas that will experience high stress during post-processing, enabling strategic placement of structural supports only where needed. The compliance map is generated in advance to guide support placement, avoiding unnecessary complexity while ensuring integrity during machining operations.
Solution Approach 2:
The patent implements local quality by using the compliance map to place structural supports only at specific locations where the analysis indicates high displacement or stress during post-processing. Rather than adding supports throughout the entire part, the method identifies critical areas based on mode shape analysis and applies supports locally to those regions, minimizing added complexity while maintaining necessary strength.
2Manufacturing precision
If post-processing steps are implemented to improve surface finish, then surface quality is improved, but the part must withstand applied forces during processing
Solution Approach 1:
The patent applies preliminary action by performing frequency analysis and calculating mode shapes before the actual manufacturing and post-processing occurs. This advance analysis allows the design to be optimized in anticipation of the forces that will be applied during post-processing, ensuring the part has sufficient structural integrity to withstand machining operations while still achieving improved surface finish.
Solution Approach 2:
The patent implements preliminary anti-action by using frequency analysis and mode shape calculations to predict and prepare against the harmful effects of post-processing forces. The compliance map identifies areas that will be most susceptible to deformation during machining, allowing preventive measures to be taken in the form of strategically placed structural supports that counteract the anticipated stresses during post-processing.
3Strength
If material is added to form structural supports, then structural integrity is improved, but material removal is required after post-processing
Solution Approach 1:
The patent applies preliminary action by performing frequency analysis and mode shape calculations before manufacturing to identify the precise locations where structural supports are needed. This allows the supports to be added only to critical areas that will experience high stress during post-processing, and can be removed after the supports have served their protective function during machining operations.
Solution Approach 2:
The patent implements local quality by placing structural supports only at specific locations identified through compliance map analysis, rather than adding material throughout the entire part. This localized approach minimizes the amount of material that needs to be added and subsequently removed, reducing waste while ensuring sufficient structural integrity during the post-processing operations.
Data Source
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AI summary
Methods and devices using a computer-generated design of an AM part to ensure that the part is design to support additional manufacturing steps. The methods include performing frequency analysis on a computer-generated design of the manufactured part and calculating mode shapes at natural frequencies of the computer-generated design. A static compliance is calculated at points on the computer-generated design using each of the mode shapes. The static compliance indicates an expected displacement at each of the plurality of points when the computer generated design is exposed to a predetermined non-dynamic load.