Variable Draw Speed Stereolithography for Thin-Walled Curing
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Solution Overview
Problem
Existing additive manufacturing techniques, such as stereolithography, often result in unsolidified liquid photopolymer within parts due to insufficient control over draw speed, leading to structural weaknesses and poor material properties, especially in thin-walled structures.
Innovation Solution
Implementing a method where a stereolithography apparatus uses a pulsed laser to scan photopolymer resin at varying draw speeds based on the width of the part's features, with slower speeds for thin-walled sections and faster speeds for thicker sections, to ensure complete curing and prevent gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a constant high draw speed is used to increase productivity, then manufacturing efficiency improves, but thin-walled structures contain unsolidified liquid photopolymer resulting in poor material properties
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant draw speed to a dynamic variable draw speed that adapts to local geometric features. The system automatically adjusts laser scan speed based on real-time analysis of wall thickness, ensuring optimal curing for each region while maintaining overall productivity.
Solution Approach 2:
The patent implements local quality by applying different draw speeds to different regions of the part based on local geometry. Thin-walled sections receive slower scan speeds for complete curing, while thick sections use faster speeds, ensuring each region receives appropriate processing parameters for its specific requirements.
2Reliability
If laser power is increased to ensure complete curing of thin walls, then material properties improve, but cure depth increases causing distortion in other portions of the part
Solution Approach 1:
The patent applies local quality by using different laser parameters for different regions. Thin-walled sections receive higher laser power with slower scan speeds for complete curing, while thick sections use lower power with faster speeds, preventing excessive cure depth and distortion in areas where it is not needed.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting both laser power and draw speed based on local geometry. This coordinated parameter adjustment ensures complete curing in thin walls while maintaining appropriate cure depth in other regions, preventing distortion and maintaining dimensional accuracy.
3Reliability
If draw speed is decreased to ensure complete curing of thin walls, then material properties improve, but manufacturing time increases
Solution Approach 1:
The patent applies dynamics by using variable draw speed that automatically adjusts to local geometry requirements. Thin-walled sections use slower speeds for complete curing, while thick sections and non-critical areas use faster speeds, optimizing the balance between material quality and manufacturing time.
Solution Approach 2:
The patent implements partial action by applying the slower draw speed only where necessary for thin-walled sections rather than uniformly across the entire part. This selective approach ensures complete curing where needed while maintaining faster overall manufacturing throughput.
4Device complexity
If uniform laser scanning is used for all portions, then device complexity remains low, but thin-walled portions contain gaps and unsolidified material
Solution Approach 1:
The patent applies preliminary action by performing advance analysis of the CAD model to identify thin-walled sections before manufacturing begins. The system pre-determines optimal draw speeds for each region based on wall thickness, eliminating the need for complex real-time adjustments during scanning while ensuring complete curing.
Solution Approach 2:
The patent implements feedback by continuously monitoring the relationship between laser parameters and local geometry during scanning. The system uses real-time feedback from geometric analysis to adjust draw speed dynamically, ensuring complete curing in thin walls while maintaining simple overall process control.
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 effectively solidifies thin-walled structures without gaps, improving material properties and manufacturing tolerances by optimizing the curing process through controlled draw speeds and laser intensity distribution.
Implementation Method 1
a stereolithography apparatus that cures a liquid photopolymer into a solid polymer using a laser
Data Source
AI summary
The present disclosure generally relates to methods and apparatuses for additive manufacturing (AM) that utilize a pulsed laser to solidify a liquid photopolymer. The method includes scanning a first portion of the photopolymer with the laser at a first draw speed, wherein the first portion of the photopolymer corresponds to a first portion of the part that has a width less than a threshold width. The method also includes scanning a second portion of the photopolymer with the laser at a second draw speed that is greater than the first draw speed, wherein the second portion of the photopolymer corresponds to a second portion of the part that has a width greater than the threshold width.