3D Printing Path Planning for Functionally Graded Materials
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Solution Overview
Problem
Existing 3D printing techniques fail to adequately plan the path for a printer's extruding head when creating functionally graded materials, as they do not account for the rate of change in material composition, leading to inefficiencies and material waste due to the need for purging the mixing chamber.
Innovation Solution
A system and method for planning the path of a 3D printer's extruding head that evaluates the rate of change in material composition at each point and defines printable polygons, allowing the printer to extrude the required mix without purging the mixing chamber, by determining the boundaries and generating material extrusion commands based on the printer's characteristics and the composition of the material mix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the printer head follows a predefined path to extrude material mix, then the printing process can proceed continuously, but the composition change rate may exceed the printer's capability requiring chamber purging
Solution Approach 1:
The system performs preliminary calculation of the printing path to determine feasible transitions between material compositions before actual printing. By pre-evaluating which composition changes are achievable within printer constraints, the system avoids situations requiring chamber purging during printing, thus maintaining both high productivity and composition accuracy.
Solution Approach 2:
The system changes the parameter of composition transition rate to match printer capabilities. By adjusting the printing path to ensure composition changes occur at rates within the printer's mixing chamber capabilities, the system eliminates the need for purging while maintaining continuous printing operation.
2Reliability
If the mixing chamber is purged to accommodate composition changes, then composition accuracy is maintained, but material waste and printing time increase
Solution Approach 1:
The system pre-calculates the printing path to identify all composition transitions required and determines which are achievable without purging. By planning ahead, the system avoids unnecessary purging operations that would waste material already loaded in the mixing chamber, thus reducing material waste while maintaining composition accuracy.
Solution Approach 2:
The system changes the approach from reactive purging to proactive path planning. By modifying the printing path parameters to stay within mixer capabilities, the system eliminates material waste associated with purging while preserving composition accuracy through feasible transition planning.
3Reliability
If the mixing chamber is purged to accommodate composition changes, then composition accuracy is maintained, but printing speed decreases
Solution Approach 1:
The system performs preliminary path planning to identify all composition transitions and determine feasibility before printing begins. This advance planning eliminates the need for interruptive purging operations during printing, maintaining composition accuracy while preserving printing speed through continuous operation.
Solution Approach 2:
The system changes the printing parameters by adjusting the path to match mixer capabilities. By ensuring all composition transitions in the planned path are achievable without purging, the system maintains both composition accuracy and high printing speed through uninterrupted continuous printing.
4Ease of manufacture
If existing path planning techniques are used, then the printing path can be generated, but the rate of composition change is not accounted for leading to printing failures
Solution Approach 1:
The system performs preliminary evaluation of composition transitions along the printing path before finalizing it. By pre-checking whether each composition change is achievable within printer constraints, the system ensures the generated path is actually printable, thus improving reliability while maintaining ease of manufacture through automated planning.
Solution Approach 2:
The system incorporates feedback by evaluating whether composition transitions are feasible and adjusting the path accordingly. The path planning process uses feedback from composition change rate calculations to modify the printing path, ensuring all transitions are achievable and the final path is guaranteed to be printable.
Data Source
AI summary
Functionally graded materials can be prepared through additive manufacturing by determining the path that a head of 3D printer can follow while extruding a material mix of a required composition at required points of a layer of an FGM. Each point within the layer is evaluated regarding the directions within which the printing head can move into from that point while extruding the material mix of a required composition. Based on the evaluation, a multitude of polygons are defined within the polygonal shape that are guaranteed to be printable. A path can be designed for the printing head to follow to print all of the defined polygons, and consequently, to print the entire polygonal layer. Material extrusion commands are generated for the printing head.