Rotary 3D Printing Drum Eliminates Layer Pause Time
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Solution Overview
Problem
Conventional 3D printing methods are time-consuming due to the need for linear movement of powder applicators and smoothing rollers, which require a larger footprint and result in delays between layer formation, limiting the scalability of the process.
Innovation Solution
A continuous rotary 3D printing system featuring a rotating drum with a build platform and a powder feed hopper, where the build platform moves linearly within the drum and is rotationally fixed, allowing for continuous powder deposition and smoothing without the need for linear movement of powder applicators, enabling uninterrupted energy application for layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If linear movement of powder applicator and smoothing roller is used, then powder deposition and smoothing can be accomplished, but the process requires pauses between layer formation increasing production time
Solution Approach 1:
The system transitions from static linear movement to dynamic rotary motion. The build platform rotates continuously while the powder applicator and smoothing roller move axially along the platform, enabling continuous powder deposition and smoothing without pauses between layers, thus eliminating production time losses.
Solution Approach 2:
The rotary mechanism enables continuous operation where powder deposition and smoothing occur simultaneously in different axial positions. The energy beam can continuously process layers as the platform rotates, eliminating the intermittent pauses required in linear movement systems.
2Area of stationary object
If reciprocal linear movement path is used for depositing and smoothing, then both functions can be performed, but the footprint increases
Solution Approach 1:
The system adds the axial dimension to the movement. Instead of moving back and forth in the same plane (reciprocal linear movement), the powder applicator and smoothing roller move axially along the rotating build platform, utilizing the rotational dimension to reduce the footprint in the radial plane.
Solution Approach 2:
The dynamic rotation of the build platform allows the powder applicator and smoothing roller to operate in different axial positions simultaneously, eliminating the need for reciprocal movement paths and reducing the overall footprint of the system.
3Productivity
If energy beam application is paused for powder deposition and smoothing, then layer formation can be completed, but the fabrication process becomes time-consuming
Solution Approach 1:
The continuous rotation of the build platform allows the energy beam to continuously process layers without interruption. Powder deposition and smoothing occur in different axial positions during rotation, enabling uninterrupted energy application and significantly increasing fabrication speed.
Solution Approach 2:
Powder deposition and smoothing are performed in advance in different axial positions before the energy beam reaches those positions. This preliminary action allows the energy beam to continuously process layers without waiting for powder deposition and smoothing to complete.
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 reduces the time required for 3D printing by eliminating the need for pauses between layer formation, allowing for faster and more efficient fabrication of complex objects with a smaller footprint, thereby enhancing the scalability of the process.
Implementation Method 1
an energy beam of light or heat is projected to melt the top layer of the powder bed so that it welds onto a substrate or a substratum
Implementation Method 2
selective laser sintering, selective laser melting or selective electron beam melting
Implementation Method 3
The build platform is rotationally fixed relative to the drum such that the build platform rotates with the drum
Implementation Method 4
A powder feed hopper is fixed at a position above a first portion of the build platform
Data Source
AI summary
An apparatus for fabricating a three-dimensional object from a representation of the object stored in memory. The apparatus includes an outer drum supported for rotation and an inner drum positioned within the outer drum and supported for rotation therewith. A powder receiving chamber is defined between the outer drum and the inner drum. A build platform is supported for linear movement within the powder receiving chamber from a first position adjacent a first end of the drums to a second position within the powder receiving chamber. The build platform is rotationally fixed relative to at least one of the inner or outer drums such that the build platform rotates with the drums. At least one directed energy source is positioned above the build platform and is configured to apply directed energy to at least a portion of the powder receiving chamber.