Stereolithography Lateral Motion Resin Replenishment
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Solution Overview
Problem
Conventional stereolithography systems face limitations in building complex 3D objects due to the need for solid support structures and layer-wise processes, which slow down production and are affected by irregularities in the material surface.
Innovation Solution
A stereolithography system with modified projection geometry that moves a carrier platform sideways, allowing for continuous material reflow and eliminating the need for solid support structures, by projecting an image of a section of the 3D object laterally and moving the support plane laterally to detach the cured section, enabling uninterrupted building and improved resin layering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional stereolithography uses layer-wise construction with support structures, then complex 3D objects can be built, but build time increases and production speed decreases
Solution Approach 1:
The system transitions from static layer-wise construction to dynamic continuous construction. The support plane moves continuously in the x-direction while the laser scans in the y-direction, enabling simultaneous curing of multiple sections and eliminating the need to wait for each layer to complete before starting the next.
Solution Approach 2:
The invention adds a new dimension of motion by moving the support plane laterally in the x-direction, perpendicular to the traditional z-direction layer construction. This creates a continuous construction space where multiple layers can be built simultaneously at different x-positions, transforming the process from sequential 2D layer construction to parallel 3D construction.
2Reliability
If conventional stereolithography stabilizes resin surface layer by layer, then material irregularities are controlled, but material layering overhead increases and throughput decreases
Solution Approach 1:
The system maintains continuous useful action by keeping the laser beam continuously active while the support plane moves. Instead of stopping to stabilize and reapply resin layers, the continuous motion of the support plane through the resin bath automatically replenishes material at the curing interface, eliminating idle time and maintaining constant production.
Solution Approach 2:
The moving support plane system is self-servicing regarding material replenishment. As the support plane moves laterally through the resin bath, fresh resin automatically flows to the curing interface without requiring external intervention for layer stabilization or manual material application, reducing overhead operations.
3Adaptability or versatility
If conventional stereolithography uses solid support structures, then overhangs and complex geometries are supported, but additional material and time are required, and support removal is needed
Solution Approach 1:
The invention extracts and eliminates the support structure function from the traditional stereolithography process. By moving the support plane laterally through the resin, the system provides continuous support during construction without requiring permanent support structures that need to be added and later removed, thus eliminating the associated time loss.
Solution Approach 2:
The system performs preliminary action by continuously replenishing resin material at the curing interface through the moving support plane. This prevents material depletion and maintains consistent curing conditions throughout the build process, eliminating the need for pause-and-replenish cycles that would otherwise be required.
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 simplifies 3D object production, reduces build times, and increases build speeds by minimizing material layering overhead and eliminating the need for stabilization of the resin surface, resulting in higher system throughput and improved mechanical properties of the built parts.
Implementation Method 1
forming a cured section by irradiating laterally an interface of a photopolymerizable material on the building plane with light corresponding to the image of the section of the three-dimensional object
Data Source
AI summary
An example method for constructing a three-dimensional object in accordance with aspects of the present disclosure includes projecting an image of a section of a three-dimensional object on a building plane through a projection unit, forming a cured section by irradiating laterally an interface of a photopolymerizable material on the building plane with light corresponding to the image of the section of the three-dimensional object, moving a support plane laterally to detach the cured section from the building plane resulting in a gap between the cured section and the building plane, and filling the gap between the cured section and the building plane with photopolymerizable material.