Stereolithography Multi-Blade Recoating for Faster Fabrication
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Solution Overview
Problem
Existing 3D printing systems, particularly stereolithography systems, face challenges in improving productivity and reducing total fabrication time.
Innovation Solution
A three-dimensional printing system incorporating a plurality of coater blades coupled to a horizontal movement mechanism, which are operated by a controller to translate over a build plane, apply a new layer of photocurable resin, and concurrently irradiate it with an imaging subsystem to selectively cure the resin in lateral regions, enhancing the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single coater blade is used to apply resin layer by layer, then the system structure is simple, but the fabrication time is long and productivity is low
Solution Approach 1:
The coating subsystem is segmented into multiple independent coater blades (N blades) that can simultaneously apply resin to different lateral regions of the build plate. This segmentation allows parallel coating operations, reducing the total time required to coat the entire build area and thereby increasing fabrication speed without requiring a complete redesign of the coating mechanism.
Solution Approach 2:
The system transitions from a single-point coating approach to a multi-point parallel coating approach by distributing N coater blades across the lateral dimensions of the build plate. This dimensional expansion enables simultaneous coating of multiple regions, effectively converting a sequential process into a parallel one and reducing fabrication time.
2Manufacturing precision
If the imaging subsystem operates sequentially after resin application, then the curing process is complete and accurate, but the total fabrication time increases
Solution Approach 1:
The resin coating action is performed in advance during the translation of coater blades across the build plate, preparing all necessary layers before the imaging subsystem begins its curing operation. This preliminary coating ensures that when imaging starts, the resin is already in position, allowing the curing process to proceed without waiting for sequential coating operations and reducing overall fabrication time while maintaining curing accuracy.
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
The system significantly reduces fabrication time by optimizing the application and curing of resin layers, thereby improving productivity and efficiency in the manufacturing of 3D articles.
Implementation Method 1
A stereolithography system utilizes a resin vessel, an imaging system, and a build plate within liquid photocurable resin held by the resin vessel. An article is manufactured in a layer-by-layer manner by selectively imaging and radiatively curing layers of the photocurable resin over the build plate.
Data Source
AI summary
A three-dimensional (3D) printing system configured to manufacture a three-dimensional (3D) article includes a vessel configured to contain a photocurable resin, a build plate coupled to the vertical movement mechanism, an imaging subsystem configured to selectively image over a build plane that is above the build plate, a coating subsystem including a plurality (N) of coater blades coupled to a horizontal movement mechanism, the N coater blades defining lateral regions therebetween, and a controller. The controller is configured to operate the vertical movement mechanism to position an upper surface of the build plate or the 3D article one layer thickness below the build plane, operate the horizontal movement mechanism to translate the N coater blades over the build plane and to provide a new layer of resin over the upper surface, and operate the imaging subsystem to selectively irradiate the new layer of resin in the lateral regions.