3D Printing Controller Velocity Profiles for Thermal Uniformity
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Solution Overview
Problem
Current powder-based 3D manufacturing methods face challenges in achieving thermal uniformity during the layer-by-layer formation of 3D objects, leading to variations in the degree of fusion and mechanical strength across different locations on the build area, as the time between fusion and powder distribution differs significantly depending on the location.
Innovation Solution
The method involves moving a droplet deposition unit, a first radiation source, and a powder distributor in the same direction across the build area, with controlled velocity profiles to deposit a radiation absorber, fuse the powder, and distribute a fresh layer, while adjusting the time interval between the radiation source and the powder distributor to ensure uniform energy input and fusion across all locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rapid processing is implemented by using both forward and return passes of radiation source and powder distributor, then productivity is improved, but thermal uniformity deteriorates due to varying time intervals between fusion and powder distribution at different locations
Solution Approach 1:
The build area is divided into multiple zones along the scanning direction, with each zone having independently adjustable velocity profiles for the radiation source and powder distributor. This segmentation allows different time intervals to be applied at different locations, enabling rapid processing in some zones while maintaining thermal uniformity in others.
Solution Approach 2:
The velocity profiles of the radiation source and powder distributor are made dynamically adjustable during the layer sequence. By continuously varying the velocities according to position-dependent profiles, the system maintains optimal thermal conditions at each location while achieving high overall processing speed through unidirectional scanning.
2Temperature
If unidirectional scanning is used to maintain thermal uniformity with consistent time intervals, then thermal uniformity is improved, but productivity decreases due to longer processing time compared to bidirectional scanning
Solution Approach 1:
Different velocity profiles are applied to different zones along the scanning direction. In zones where thermal uniformity is critical, slower velocities are used to maintain consistent time intervals. In other zones, faster velocities are permitted, allowing the unidirectional scan to achieve productivity comparable to bidirectional scanning while maintaining thermal uniformity where needed.
3Device complexity
If the time interval between radiation source and powder distributor is not controlled, then device complexity is reduced, but manufacturing precision deteriorates due to variations in fusion degree and mechanical strength
Solution Approach 1:
The control system continuously monitors the positions and velocities of both the radiation source and powder distributor, and dynamically adjusts their velocity profiles to maintain a consistent time interval throughout the layer sequence. This feedback control ensures uniform fusion and mechanical properties without requiring complex mechanical synchronization mechanisms.
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 enhances thermal uniformity and mechanical integrity by maintaining a consistent time interval for fusion and distribution, reducing variations in the thermal cycle and improving the mechanical strength of the final 3D objects.
Implementation Method 1
moving the droplet deposition unit and depositing, using a droplet deposition unit, a radiation absorber onto regions of a previously applied layer of powder
Implementation Method 2
exposing the layer to radiation from a radiation source. The regions containing the radiation absorber preferentially absorb radiation from the radiation source and heat up sufficiently to fuse
Implementation Method 3
selective laser sintering and high speed sintering
Implementation Method 4
moving the second radiation source whilst activating the second radiation source to apply energy to preheat the fresh layer of powder
Implementation Method 5
distributing a fresh layer of powder over the build area
Data Source
AI summary
A controller and method for layer-by-layer manufacturing of a three-dimensional object from a powder. The method includes, in a first direction across a build area: moving a droplet deposition unit and depositing a radiation absorber onto regions of a previously applied layer of powder; moving a first radiation source according to a first velocity profile whilst activating the first radiation source to fuse the regions of powder where the absorber has been deposited; moving a powder distributor according to a second velocity profile and distributing a fresh layer of powder; and moving a second radiation source whilst activating the second radiation source to preheat the fresh layer of powder. The method further includes adjusting the first and/or second velocity profiles to control a time interval between the passing of the first radiation source and the powder distributor.