3D Model Proximity Correction for Thermal Contraction
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Solution Overview
Problem
Current 3D printing processes introduce dimensional and positional errors due to mismatches in coefficients of thermal expansion, making manual inspection and modification time-consuming, expensive, and inconsistent.
Innovation Solution
A method and system for automatic proximity correction that uses a 3D scanner to measure differences between the printed structure and the original model, adjusts the model by adding or subtracting material based on thermal contraction, and iteratively prints the structure until it meets specified tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual inspection and modification is performed after each build, then dimensional accuracy can be improved, but time consumption and cost increase significantly
Solution Approach 1:
The system performs preliminary action by automatically measuring and adjusting the 3D model before printing to compensate for thermal contraction. The model is modified in advance with expanded dimensions in regions prone to contraction, eliminating the need for post-build manual modification while maintaining dimensional accuracy.
Solution Approach 2:
The system implements self-service by automatically measuring the printed structure with a 3D scanner, comparing it to the original model, calculating thermal contraction, and generating an adjusted model without human intervention. This automated closed-loop process eliminates manual inspection and modification steps.
2Manufacturing precision
If manual sanding, milling, or polishing is performed, then dimensional accuracy can be improved, but consistency and quality vary
Solution Approach 1:
The system replaces manual mechanical operations (sanding, milling, polishing) with an automated computational approach. A 3D scanner captures the printed structure, software algorithms analyze dimensional deviations and calculate thermal contraction, and an adjusted digital model is generated automatically, ensuring consistent and repeatable results.
Solution Approach 2:
The system changes parameters by automatically adjusting the digital model's dimensional parameters based on measured thermal contraction. The model is modified with expanded dimensions in specific regions to compensate for expected contraction during printing, ensuring consistent dimensional accuracy across multiple builds.
3Ease of manufacture
If thermal expansion mismatch is not accounted for, then printing process is simpler, but dimensional errors occur
Solution Approach 1:
The system explicitly accounts for thermal expansion/contraction by measuring the printed structure with a 3D scanner, calculating the thermal contraction based on material properties and printing conditions, and adjusting the digital model to compensate. This ensures dimensional accuracy while maintaining process simplicity through automation.
Solution Approach 2:
The system implements feedback by measuring the actual printed structure with a 3D scanner, comparing it to the original model, calculating thermal contraction, and using this information to generate an adjusted model for the next print. This closed-loop feedback ensures dimensional accuracy without complicating the printing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures accurate and consistent 3D printing by automatically accounting for thermal expansion and contraction, reducing the need for manual finishing and minimizing equipment wear, while saving time and resources.
Implementation Method 1
materials that change dimensions under temperature changes
Data Source
AI summary
Methods and systems for printing accurate three-dimensional structures include printing an original three-dimensional structure according to an original three-dimensional model. The original three-dimensional model is adjusted to reduce measured differences between the printed three-dimensional structure and the original three-dimensional model, by adding material to the original three-dimensional model in proportion to an amount of thermal contraction in a region. An adjusted three-dimensional structure is printed according to the adjusted three-dimensional model.