Rotating Cylinder Additive Manufacturing for High Throughput
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Solution Overview
Problem
Additive manufacturing techniques, such as stereolithography, face limitations in throughput, particularly when increasing printing resolution, as reducing spot size significantly reduces printer throughput, making high-resolution printing time-consuming.
Innovation Solution
Implementing a digital micromirror device (DMD) array for image scanning and using a polar-based rotating cylinder platform for continuous printing, allowing for high throughput while maintaining high spatial resolution by increasing the effective resolution of a large spot size and adjusting the position and speed of the coater and rotation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the spot size is reduced to increase printing resolution, then the manufacturing precision is improved, but the productivity decreases significantly
Solution Approach 1:
The patent segments the build area into multiple zones that can be printed simultaneously using multiple laser beams or a scanned single beam. This allows parallel processing of different regions, maintaining high resolution while increasing overall throughput by avoiding sequential printing of the entire build area.
Solution Approach 2:
The patent employs dynamic scanning of the laser beam across the build platform, allowing the system to adaptively adjust beam position, speed, and exposure parameters. This dynamic approach enables high-resolution printing without requiring the entire build area to be processed at the slowest spot size, thereby improving throughput while maintaining precision where needed.
2Manufacturing precision
If the spot size is reduced to achieve higher resolution, then the manufacturing precision is improved, but the time required for printing increases
Solution Approach 1:
The patent implements continuous scanning and printing operations without stopping or repositioning the build platform between layers. The laser beam continuously traces the toolpath while material is deposited, eliminating idle time and maintaining constant productive action throughout the printing process, thereby reducing total printing time while preserving high resolution.
Solution Approach 2:
The patent performs preliminary planning and optimization of toolpaths before printing begins, pre-calculating efficient scanning patterns and exposure parameters. This allows the system to execute high-resolution printing with optimized timing and motion sequences, minimizing unnecessary movements and exposure time while maintaining precision.
3Ease of operation
If a cartesian-based build platform is used with sequential layer deposition, then the ease of operation is maintained, but the productivity is limited
Solution Approach 1:
The patent transitions from static, sequential layer deposition to dynamic concurrent printing where multiple layers or regions are printed simultaneously using scanned beams. The build platform remains operational throughout the process rather than requiring repeated lifting and repositioning, enabling continuous productive action and significantly increasing throughput while maintaining operational simplicity.
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 increases the throughput of additive manufacturing processes without sacrificing resolution, enabling faster production of high-resolution parts by using a DMD array and a rotating cylinder platform to efficiently deposit and cure photopolymer layers.
Implementation Method 1
a radiation source of the image scanning system projects an array of point sources (an image or pattern) onto the photopolymer material for an exposure time to cure a given layer
Data Source
AI summary
An additive manufacturing technique uses digital mask-based illumination and a polar-based build environment for increased throughput. In one embodiment, the build environment comprises a rotating element having a surface. A coater is configured to deposit photopolymer material on the rotating element at a given flow rate. As the element rotates and the coater deposits the photopolymer material, a radiation source of an image scanning system projects an array of point sources (an image) onto the photopolymer material for an exposure time to cure a given layer. As the photopolymer material is deposited layer-upon-layer, and for each layer, a control system adjusts a relative position of the coater with respect to the surface, adjusts a speed of rotation of the rotating element, and maintains the flow rate and the exposure time constant.