Rotating Turntable Depowdering for Laser Powder Bed Fusion
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Solution Overview
Problem
In laser powder bed fusion processes, removing unused powder effectively from printed workpieces is challenging due to static friction forces that trap the powder, requiring innovative methods to break and convey it away efficiently.
Innovation Solution
An apparatus and method utilizing a rotating turntable and optional impulse generator to apply rotational forces and impulses, respectively, to break static friction and efficiently remove unused powder from workpieces, with the option of multiple turntables and platforms for handling multiple workpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional static depowdering methods are used, then the process is simple to operate, but static friction forces trap the powder making removal ineffective
Solution Approach 1:
The patent applies dynamic rotation to the workpiece on a turntable, transforming the static depowdering process into a dynamic one. The rotational motion generates centrifugal forces that overcome static friction between the powder and workpiece surface, enabling effective powder removal without complex additional mechanisms.
Solution Approach 2:
The patent incorporates vibration mechanisms that work in conjunction with rotation to further reduce static friction forces. The vibrational motion disrupts the bonding between powder particles and the workpiece surface, enhancing the depowdering effectiveness while maintaining operational simplicity.
2Reliability
If rotational forces are applied to break static friction, then powder removal effectiveness improves, but energy consumption increases
Solution Approach 1:
The patent applies rotational and vibrational forces that are sufficient to overcome static friction but not excessively high. The system uses moderate rotation speeds and vibration amplitudes that provide just enough energy to break the friction bonds, avoiding unnecessary energy consumption while achieving effective powder removal.
Solution Approach 2:
The rotational and vibrational motions enable the workpiece to essentially depowder itself without requiring additional external forces or complex mechanisms. The kinetic energy from rotation and vibration is self-sufficient to overcome static friction, minimizing the need for extra energy input.
3Productivity
If multiple turntables and platforms are used to handle multiple workpieces, then productivity increases, but device complexity increases
Solution Approach 1:
The patent combines multiple turntables and platforms into a single integrated apparatus where multiple workpieces can be processed simultaneously. The stacked configuration allows vertical stacking of turntables, each with its own platform, enabling parallel processing of multiple workpieces without requiring separate independent systems.
Solution Approach 2:
Each turntable and platform combination serves as a universal processing unit that can handle any workpiece. The modular design allows the same rotational and vibrational mechanisms to be applied to multiple workpieces simultaneously, providing multi-functionality without requiring different specialized mechanisms for each workpiece.
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 solution effectively breaks static friction and conveys unused powder away from workpieces, enhancing the depowdering process by applying rotational forces and impulses, improving the efficiency of powder removal.
Implementation Method 1
when the turntable is rotating, rotational forces applied to the workpiece depowder the workpiece
Implementation Method 2
removing unused powder effectively from printed workpieces is challenging due to static friction forces that trap the powder
Implementation Method 3
an impulse generator configured to generate an impulse against the turntable, wherein when the turntable rotates, the impulse generator generates the impulse and unused powder is thereby broken from the workpiece
Data Source
AI summary
Disclosed is an apparatus for depowdering a workpiece printed from a laser powder bed fusion process, having: a base; a turntable that rotates relative to the base, the turntable configured to receive the workpiece; and in operation, when the turntable is rotating, rotational forces applied to the workpiece depowder the workpiece.