Stereolithography Machine Leveling Mechanism for Resin Viscosity Bottleneck
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Solution Overview
Problem
The existing stereolithography methods are inefficient due to prolonged processing times caused by waiting for the liquid resin to level after each layer solidification, especially with high viscosity resins like hybrid resins, which significantly increases the overall processing time and requires larger machine dimensions.
Innovation Solution
A stereolithography method and machine that utilize levelling means, such as a paddle, to redistribute the fluid substance and fill depressions quickly, allowing for rapid layer formation independent of viscosity and reducing machine dimensions by eliminating the need to move the container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If spontaneous levelling of liquid resin is used after each layer solidification, then the resin naturally fills the depression, but the processing time is considerably prolonged due to waiting time
Solution Approach 1:
The liquid resin itself performs the levelling function by spontaneously flowing to fill the depression created when the modelling plate is lifted. This self-service mechanism eliminates the need for external levelling equipment while maintaining the levelling function through the resin's own viscous flow properties
Solution Approach 2:
The resin is prepared in advance with appropriate viscosity characteristics that enable it to rapidly level itself after each layer solidification. The resin's flow properties are optimized beforehand to ensure quick depression filling without requiring external intervention during the layer-by-layer building process
2Ease of operation
If a movable tank with fixed levelling paddle is used to fill depressions, then levelling is achieved, but the machine dimensions are increased due to space required for tank movement
Solution Approach 1:
The levelling function is extracted from a separate movable tank system and integrated directly into the container structure. The container's bottom surface itself performs the levelling action by allowing resin to flow freely, eliminating the need for external levelling paddles and large movement spaces
Solution Approach 2:
The levelling function is merged with the container structure itself. The container bottom is designed to facilitate resin flow and depression filling as an inherent feature, combining the containment and levelling functions into a single integrated structure that reduces overall machine footprint
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 significantly reduces overall processing time, particularly with high viscosity resins, and minimizes machine size, enabling faster production of three-dimensional objects without being hindered by resin viscosity.
Implementation Method 1
a light source, generally a laser emitter or a projector, capable of selectively irradiating the layer of liquid resin arranged adjacent to the bottom of the container so that it solidifies
Implementation Method 2
lifting the modelling plate and the solidified layer means leaving a depression in the liquid resin, which is filled by the spontaneous flow of the resin itself
Data Source
AI summary
A method for producing a three-dimensional object (11) in layers by using a stereolithography machine (1) that includes: a container (2) containing a fluid substance (3) suited to solidify through exposure to predefined radiation (4a); an emitter (4) suited to emit the predefined radiation (4a) and to solidify a layer of the fluid substance (3) adjacent to the bottom (2a) of the container (2); a modelling plate (5) suited to support the solidified layer (6) and associated with an actuator (7) suited to move it perpendicular to the bottom (2a) of the container; a leveler (8) arranged in contact with the fluid substance (3). The method includes: selectively irradiating the layer of fluid substance to obtain the solidified layer; extracting the solidified layer from the fluid substance; redistributing the fluid substance in the container by moving the leveler so that they are passed between the modelling plate and the container.