Stereolithography Shrinkage Control via Variable Laser Power
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Solution Overview
Problem
Stereolithography techniques face challenges in minimizing differential shrinkage, leading to distortions and deformations in 3D objects, particularly in large flat surfaces, due to uneven material contraction, which existing methods attempt to address through complex redesigns of scanning and software but result in slower production times and reduced quality.
Innovation Solution
The method involves adjusting the stimulation power and pre-stimulation waiting time for each layer based on parameters from preceding and following layers, using fuzzy logic to determine optimal conditions, which minimizes shrinkage without requiring complex software redesigns and maintains part quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex redesign of scanning techniques and software patterns is used to reduce shrinkage, then manufacturing precision is improved, but device complexity increases and productivity decreases
Solution Approach 1:
The patent changes the parameter of stimulation power from a constant value to a variable that depends on the position within the layer and the layer number. By defining stimulation power as a function of spatial coordinates and layer index, the method achieves differential curing control without complex software redesign, directly resolving the contradiction between precision improvement and device complexity
Solution Approach 2:
The patent introduces a pre-stimulation waiting time parameter that is set in advance based on layer characteristics before the actual stimulation occurs. This preliminary timing adjustment allows the resin to be in the optimal state for curing, reducing shrinkage effects while maintaining simple scanning patterns and avoiding complex real-time control software
2Manufacturing precision
If complex redesign of scanning techniques and software patterns is used to reduce shrinkage, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent modifies the stimulation power parameter dynamically based on position and layer number, enabling uniform shrinkage control across different regions. This approach maintains fast scanning speeds because it does not require complex pattern redesign or multiple scanning passes, thus improving precision without sacrificing productivity
Solution Approach 2:
By pre-calculating and setting the waiting time before stimulation based on layer parameters, the method prepares the resin in advance for optimal curing. This eliminates the need for multiple subsequent exposure steps or time-consuming pattern adjustments, achieving high precision while maintaining fast construction times
3Productivity
If standard stimulation power is used for all layers, then productivity is maintained, but manufacturing precision deteriorates due to differential shrinkage
Solution Approach 1:
The patent implements position-dependent and layer-dependent stimulation power variation. The stimulation power is adjusted as a function of spatial coordinates within the layer and the layer number, creating a controlled gradient that compensates for differential shrinkage. This maintains productivity because the scanning pattern itself remains simple and fast, while precision is improved through the intelligent parameter modulation
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 reduces differential shrinkage, enhances the accuracy and strength of 3D objects, and maintains high quality without visible markings or increased production time, improving reproducibility and functionality.
Implementation Method 1
the sections of the building area that are part of the object to be constructed are illuminated, thereby causing the resin on the illuminated areas to polymerize and harden
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 2c
AI summary
The present invention relates to a new and improved stereolithography method and system for generating a three-dimensional object by forming successive, adjacent, cross-sectional laminae of that object, thereby providing an object being specially processed to reduce differential shrinkage.