Stereolithography Vat Oscillation for Adhesion Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stereolithography methods face challenges in preventing the adhesion of 3D objects to the vat bottom during the manufacturing process, often requiring complex tilting or the use of expensive oxygen permeable vats or elastic films.
Innovation Solution
A stereolithography apparatus that includes an oscillation unit to horizontally oscillate the vat with a constant amplitude smaller than the pixel size of the layered images, concurrently with image projection, to prevent adhesion, allowing for continuous resin refill and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vat is tilted or moved to detach the cured layer from the bottom, then the 3D object can be separated from the vat bottom, but the device complexity and manufacturing cost increase due to requiring tilting mechanisms or oxygen permeable vats
Solution Approach 1:
The patent applies mechanical vibration to the vat bottom through an oscillation unit that generates horizontal oscillations with amplitude smaller than the pixel size. This vibration prevents adhesion of the cured layer to the vat bottom by disrupting the bonding interface, eliminating the need for complex tilting mechanisms or oxygen permeable materials while maintaining easy detachment operation
2Ease of operation
If elastic films are used to cover the vat bottom for easier peeling, then the ease of operation improves, but the device complexity and cost increase
Solution Approach 1:
Instead of using elastic films, the patent employs mechanical vibration of the vat bottom with controlled amplitude (smaller than pixel size) to prevent adhesion. This approach achieves easy peeling operation without adding complex film structures or increasing device complexity
Solution Approach 2:
The patent replaces the mechanical/structural solution (elastic films) with a dynamic vibration-based approach. The oscillation unit generates controlled vibrations that substitute for the need of compliant film materials, simplifying the overall vat structure while maintaining operational ease
3Ease of operation
If the oscillation amplitude is larger than pixel size, then adhesion prevention is improved, but the manufacturing precision deteriorates due to blurring of layered images
Solution Approach 1:
The patent applies partial action by using oscillation amplitude that is smaller than the pixel size. This insufficient-seeming amplitude is actually optimal because it provides just enough vibration to prevent adhesion without exceeding the threshold that would cause image blurring, thus achieving the desired effect with minimal necessary action
Solution Approach 2:
The patent precisely controls the oscillation parameters (amplitude smaller than pixel size, horizontal direction, concomitant with projection) to achieve the optimal balance. By changing and constraining the amplitude parameter within a specific range, the system prevents adhesion while maintaining manufacturing precision
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 prevents 3D object adhesion to the vat bottom, streamlines the manufacturing process, and eliminates the need for costly oxygen permeable vats or elastic films, while reducing blurring and shortening generation pause periods.
Implementation Method 1
an oscillation unit that is adapted to horizontally oscillate the vat concomitantly with the projection of the layered images with a substantially constant amplitude that is smaller than the pixel size of the layered images in the horizontal direction for preventing adhesion of the three-dimensional object to the bottom of the vat
Implementation Method 2
an optical unit for sequentially projecting layered images towards the photocurable substance for hardening the photocurable substance deposited between the three-dimensional object and the bottom of the vat
Data Source
AI summary
A stereolithography apparatus for generating a three-dimensional object from a photocurable substance, that includes: a vat for storing the photocurable substance; and a platform for supporting the three-dimensional object, wherein the platform is movable relative to the vat; an optical unit for sequentially projecting layered images towards the photocurable substance for hardening the photocurable substance deposited between the three-dimensional object and the bottom of the vat; and further includes: an oscillation unit adapted to horizontally oscillate the vat concomitantly with the projection of the layered images with a substantially constant amplitude that is smaller than the pixel size of the layered images in the horizontal direction for preventing adhesion of the three-dimensional object to the bottom of the vat.