CAD Geometry Filtering for Support-Free 3D Printing
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Solution Overview
Problem
Existing CAD software struggles to efficiently design 3D models for additive manufacturing, often requiring extensive support structures that increase manufacturing costs and complexity.
Innovation Solution
A computer-aided design (CAD) method that modifies 3D shapes by extracting 2D profile representations from discrete layers, offsetting them to reduce overhang angles, and iteratively varying the geometry to minimize support structures needed for additive manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional CAD software is used to design 3D models for additive manufacturing, then the design process is straightforward, but extensive support structures are required that increase manufacturing costs and complexity
Solution Approach 1:
The system performs preliminary analysis of overhang angles during the design phase and automatically modifies geometry to prevent excessive overhangs before manufacturing begins. This proactive approach eliminates the need for extensive support structures by addressing potential manufacturing issues in advance, rather than adding supports as a corrective measure later
Solution Approach 2:
The system changes geometric parameters of the 3D model, specifically adjusting surfaces and features to maintain overhang angles within manufacturable ranges. By modifying parameters like surface orientation and geometry configuration, the system enables direct manufacturing without requiring complex support structures
2Adaptability or versatility
If support structures are added to enable additive manufacturing of complex geometries, then manufacturing capability is improved, but production costs increase
Solution Approach 1:
The system applies preliminary anti-action by pre-preventing the formation of excessive overhangs that would require support structures. Through automated geometry modification and overhang analysis, the system counteracts the tendency toward unsupported features before they become manufacturing problems, eliminating the need for sacrificial support material
Solution Approach 2:
The system enables the design to be self-sufficient by creating geometries that are inherently manufacturable without external support structures. The automated modification process makes the model self-adapting to manufacturing constraints, allowing it to be produced directly without requiring additional support elements that would later need removal
3Shape
If support structures are used during additive manufacturing, then complex geometries can be produced, but post-processing time and complexity increase
Solution Approach 1:
The system performs preliminary geometry optimization to ensure all surfaces and features meet overhang angle requirements before manufacturing. By pre-modifying the model to be fully support-free, the system eliminates the post-processing step of removing support structures, saving significant time and effort in the final stages
4Ease of manufacture
If geometry is modified to reduce overhang angles, then support structure requirements are reduced, but design flexibility is constrained
Solution Approach 1:
The system automatically changes geometric parameters such as surface orientation, curvature, and feature dimensions to maintain overhang angles within acceptable ranges. These parameter modifications are performed algorithmically to preserve the essential design intent while adapting the geometry to manufacturing constraints
Solution Approach 2:
The system resolves design conflicts by introducing additional geometric dimensions or modifying existing ones, such as adding subtle surface transitions or adjusting feature orientations in 3D space. This allows the design to maintain its functional requirements while conforming to overhang angle constraints through dimensional adjustments
Data Source
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AI summary
Methods, systems, and apparatus, including medium-encoded computer program products, for computer aided design of physical structures using techniques that facilitate manufacturing, include: modifying a three dimensional shape, for which a corresponding physical structure is to be created using a manufacturing process, to produce a modified three dimensional shape; and providing the modified shape of the modeled object for use in manufacturing the physical structure using one or more computer-controlled manufacturing systems that employ the manufacturing process. The modifications can include, for each of two or more discrete layers of the three dimensional shape along a direction associated with the manufacturing process, extracting a two dimensional profile representation of the three dimensional shape in a current discrete layer, offsetting the two dimensional profile representation by an amount associated with the manufacturing process, and changing a next discrete layer using an offset two dimensional profile representation of the current discrete layer.