3D Printing Toolpath Analysis for Realizable Orthotropic Paths
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Solution Overview
Problem
Current additive manufacturing systems struggle to generate physically realizable toolpaths for complex 3D parts with spatially varying orthotropy, as existing optimization techniques often result in unachievable fiber orientations and lack of control over path connectivity, especially for carbon fiber reinforced materials.
Innovation Solution
An additive manufacturing system and method that utilizes an electronic processor to generate physically realizable toolpaths for a direct ink write 3D printing system, taking into account part topology, load conditions, and design objectives, minimizing starts and stops, and incorporating a toolpath generator to produce optimized toolpaths that can be translated into G-code for the print head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If advanced optimization techniques are used to determine optimal fiber orientations, then part stiffness and strength are improved, but the resulting orientations are physically unachievable and do not map to realizable toolpaths
Solution Approach 1:
The patent introduces an intermediary computational layer that translates optimal fiber orientations into physically realizable toolpaths. This intermediary process involves decomposing the build volume into discrete elements, calculating optimal orientations for each element, and then generating toolpaths that approximate these orientations while respecting printer constraints such as minimum turning radii and maximum acceleration. This mediator bridges the gap between theoretical optimization and practical manufacturability.
Solution Approach 2:
The patent segments the continuous build volume into discrete elements (e.g., tetrahedra or hexahedra) and assigns fiber orientations to each element independently. This segmentation allows the system to optimize local fiber orientations while generating toolpaths that can be physically executed by the printer, as each element's orientation can be approximated by discrete toolpath segments.
2Ease of manufacture
If simple uniformly parallel or spiraling toolpaths are used, then manufacturing is simplified, but complex topologies and spatially varying orientations cannot be achieved
Solution Approach 1:
The patent implements dynamic toolpath generation where the toolpath parameters (direction, curvature, spacing) are continuously adjusted based on the local geometry and desired fiber orientation at each position in the build volume. This dynamic approach allows the system to transition from simple uniform patterns to complex spatially varying patterns as needed, enabling both manufacturing simplicity and design versatility.
Solution Approach 2:
The patent applies local quality by allowing different regions of the part to have different toolpath characteristics. Each element in the build volume can have its own optimized fiber orientation, and the toolpath can be locally adjusted to match these orientations. This enables complex topologies and spatially varying orientations in regions where they are needed while maintaining simpler patterns in regions where they are sufficient.
3Ease of manufacture
If existing proprietary software algorithms are used for toolpath planning, then basic part geometries can be manufactured, but control over path connectivity and spatially varying orientations is insufficient
Solution Approach 1:
The patent employs parameter changes by allowing the toolpath generation algorithm to adjust multiple parameters simultaneously (direction vectors, curvature radii, spacing distances, acceleration profiles) to achieve both basic geometry manufacturability and precise control over path connectivity. The system optimizes these parameters based on the desired fiber orientations and printer constraints, providing fine-grained control that proprietary software lacks.
Data Source
AI summary
An additive manufacturing (AM) system is disclosed for constructing a three dimensional (3D) part with optimized orthotropy. The system combines an electronic processor which calculates an optimal set of physically achievable toolpaths to meet a given design objective, and a 3D printing direct ink write machine capable of printing inks with reinforcing particles that result in orthotropic materials. The electronic processor may combine a Domain of Interest subsystem that transforms a mathematical description of a desired part orthotropy to a plurality of guidepaths, a toolpath generate subsystem that develops a plurality of physically realizable toolpaths from those guidepaths with a minimum number of starts and stops, a finite element subsystem that computes spatially varying material orthotropy from those toolpaths and then solves a boundary value problem to determine a figure of merit for the design, and an optimization subsystem that uses that figure of merit to update the mathematical description of the part orthotropy to iteratively develop an improved part. The optimization subsystem also includes convergence criteria to indicate when toolpaths have been achieved that yield a sufficiently optimal part has been achieved. The toolpath generate can then output the final toolpaths, which are converted to suitable code that controls the motion of the 3D printer toolhead and allows the optimized 3D part to be manufactured.