Automated Toolpath Planning for Hybrid Additive-Subtractive Fabrication
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Solution Overview
Problem
Determination of toolpaths for part fabrication, especially combined additive and subtractive techniques, is complex and time-consuming, leading to inefficiencies in fabrication processes.
Innovation Solution
A method and system for automated toolpath generation that includes receiving a virtual part, modifying it for fabrication, determining efficient toolpaths, and generating machine instructions for both additive and subtractive processes, allowing for semi-automated workflow and reduced material waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated toolpath generation is implemented, then fabrication efficiency is improved and material waste is reduced, but the complexity of the system increases
Solution Approach 1:
The system performs automated toolpath generation that determines its own fabrication parameters and paths without requiring manual intervention. The algorithm automatically analyzes the part geometry, selects appropriate manufacturing operations, and generates optimized toolpaths, allowing the system to serve itself in the complex task of process planning.
Solution Approach 2:
The patent replaces manual mechanical process planning with an automated computational algorithm. Instead of operators manually determining toolpaths through experience and trial-and-error, a computer-based system uses geometric analysis and optimization algorithms to automatically generate fabrication paths, substituting human mechanical reasoning with automated computational processes.
2Manufacturing precision
If combined additive and subtractive techniques are used, then manufacturing precision is improved, but the determination of toolpaths becomes more complex and time-consuming
Solution Approach 1:
The system merges additive and subtractive manufacturing operations into a unified automated toolpath generation process. The algorithm simultaneously plans both material deposition and removal operations, coordinating them to achieve precise part fabrication. This integration allows the system to leverage the strengths of both techniques while automating the complex coordination required between them.
Solution Approach 2:
The patent segments the fabrication process into distinct additive and subtractive operations that can be independently optimized and then coordinated. The automated system divides the overall toolpath into separate phases for material addition and removal, allowing each to be planned with appropriate parameters and strategies while maintaining overall process integration.
3Manufacturing precision
If more material is removed subtractively, then manufacturing precision is improved, but material waste increases and fabrication time increases
Solution Approach 1:
The system applies partial subtractive action by performing only the minimum necessary material removal to achieve the desired surface finish and dimensional accuracy. Rather than over-machining parts, the automated toolpath generation calculates the precise amount of material that needs to be removed, applying subtractive operations only where and to the extent needed, thus reducing material waste while maintaining precision.
Solution Approach 2:
The patent changes the parameters of subtractive operations by optimizing cutting depths, feed rates, and tool paths based on the specific part geometry and required precision. The automated system adjusts these parameters to achieve high surface finish quality with minimal material removal, rather than using fixed or conservative machining parameters that would remove excessive material.
Data Source
AI summary
A method for facilitating part fabrication, such as by automated toolpath generation, can include one or more of: receiving a virtual part; modifying the virtual part; and/or determining toolpaths to fabricate the target part. The toolpaths preferably define an ordered series of additive and subtractive toolpaths, more preferably wherein the additive and subtractive toolpaths are interleaved, which can function to achieve high manufacturing efficiency and/or performance. The method can additionally or alternatively include: generating machine instructions based on the toolpaths; fabricating the target part based on the machine instructions; calibrating the fabrication system; and/or any other suitable elements.