Toolpath Planning for Conductive Additive Manufacturing
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Solution Overview
Problem
Current toolpath planning in 3D additive printing often results in poor or non-functional conductive bonds between narrow and thick regions, as existing methods fail to ensure adequate material deposition in narrow features, leading to incomplete printing and poor conductivity in conductive wires and antennas.
Innovation Solution
A method for generating tool paths that involves offsetting input polygons, computing medial axis transforms, dilating paths, clipping, and recursively connecting them to ensure minimum spacing and maximize contact surface area between wire and multi-pass regions, using a combination of zig-zag and contour spiral patterns to guarantee complete filling and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If zig-zag or contour parallel patterns are used with minimum spacing constraints, then material buildup is avoided, but narrow regions cannot be printed at all
Solution Approach 1:
The patent segments the printing region into narrow regions (printed once along medial axis) and thick regions (printed with multiple passes), allowing each to be treated with appropriate patterns. This segmentation enables narrow regions to be printed while maintaining minimum spacing in thick regions.
Solution Approach 2:
The patent introduces an intermediary buffer region between narrow and thick regions, created by offsetting the medial axis by half the minimum stepover distance. This buffer ensures proper material deposition and conductive bonding by controlling the transition zone where material buildup would otherwise occur.
2Ease of manufacture
If conventional tool path patterns are used, then printing simplicity is maintained, but conductive bonds between narrow and thick regions are poor or non-functional
Solution Approach 1:
The patent applies different printing patterns to different regions: narrow regions use medial axis following patterns for precise single-pass printing, while thick regions use contour parallel or zig-zag patterns for complete filling. This local differentiation ensures both simplicity and reliable conductive bonds.
Solution Approach 2:
The patent performs preliminary classification of regions into narrow and thick categories before generating tool paths. This preliminary action allows the system to pre-determine which pattern to apply to each region, ensuring proper material deposition and conductive bonding from the start.
3Manufacturing precision
If narrow regions are left unprinted, then minimum spacing constraints are satisfied, but complete filling of the object is not achieved
Solution Approach 1:
The patent dynamically adjusts the printing strategy based on region classification. Narrow regions are printed with a single pass following the medial axis, while thick regions receive multiple passes. This dynamic adaptation ensures complete material deposition without violating minimum spacing constraints.
Data Source
AI summary
A method of generating a tool path for an additive manufacturing process, the tool path having an input polygon for a thick region, and an input path for a wire region. The method includes offsetting the input polygon by a minimum step over distance, creating a set of contour parallel offset lines, computing path segments from a medial axis transform of the input polygon, computing a dilation of the medial axis path by a radius approximately half the step over distance, producing a dilated medial axis, clipping the contour parallel offset paths by the medial axis path, producing, and recursively connect the medial axis paths with the clipped contour parallel paths.