Automated Additive Manufacturing De-Powdering With Controlled Vibration
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Solution Overview
Problem
The de-powdering process in binder jet additive manufacturing is inefficient and prone to damage the green part due to its lack of handling strength, necessitating improved methods to separate unbound powder without causing harm.
Innovation Solution
An automated de-powdering system using an enclosure with a sleeve and vibration mechanisms to induce controlled vibrations, loosening unbound powder while protecting the green part, followed by evacuation through flow channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If traditional de-powdering methods are used, then unbound powder can be removed, but the green part is damaged due to lack of handling strength
Solution Approach 1:
The patent applies mechanical vibration through a vibration mechanism that contacts the build platform to loosen and remove unbound powder from the green part. The vibration frequency and amplitude are controlled to be sufficient for powder removal but limited to prevent damage to the green part structure, thereby resolving the contradiction between effective powder removal and preserving green part strength.
2Productivity
If manual de-powdering is used, then the process can be controlled, but productivity is low and the process is inefficient
Solution Approach 1:
The system enables automated de-powdering where the vibration mechanism is controlled by a controller that automatically adjusts vibration parameters based on the build configuration. The system self-regulates the de-powdering process without requiring manual intervention, thereby improving productivity while maintaining process control through automated feedback and adjustment mechanisms.
3Loss of substance
If high vibration amplitude is used to remove powder, then de-powdering effectiveness is improved, but green part damage increases
Solution Approach 1:
The vibration mechanism applies controlled mechanical vibrations at optimized frequencies and amplitudes that create sufficient force to loosen unbound powder particles from the green part surface, while the amplitude is carefully limited to prevent structural damage to the green part. This resolves the contradiction by finding the optimal vibration parameter range that achieves powder removal without causing harm.
Solution Approach 2:
The system dynamically adjusts vibration parameters including frequency, amplitude, and duration based on the specific build configuration, material properties, and de-powdering progress. By changing these parameters adaptively, the system maximizes powder removal effectiveness while minimizing green part damage, resolving the contradiction between separation efficiency and part integrity.
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
Effectively separates unbound powder from the green part while minimizing damage, enhancing the handling strength and integrity of the manufactured object.
Implementation Method 1
one or more vibration mechanisms may be actuated to induce vibrations to the additive manufacturing build to loosen unbound powder material
Implementation Method 2
The loosened powder build material may then be removed from the enclosure through flow channels
Data Source
AI summary
A de-powdering system for additively manufactured objects includes an enclosure defining a cavity configured to support an additive manufacturing build. The enclosure includes a wall defining a lower boundary of the cavity, and the wall includes one or more flow channels. A sleeve is disposable in the cavity to at least partially surround the additive manufacturing build. At least one vibration mechanism is coupled to the sleeve and is actuatable to induce vibrations to the additive manufacturing build to loosen at least a portion of a powder build material from one or more objects suspended within the powder build material. The powder build material is removed from the cavity via the one or more flow channels.