Electrostatic Powder Deposition for Unsupported Additive Manufacturing
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Solution Overview
Problem
Existing additive manufacturing technologies face challenges in supporting hanging structures with inclination angles less than 45 degrees, leading to deformation and collapse, and are limited by the need for additional supporting structures, which increase resource consumption and post-processing time. Additionally, they cannot operate in reduced-gravity environments.
Innovation Solution
The system employs a Coulomb force application device with electrode plates to apply controlled vector forces to the powder material, allowing for unsupported printing of complex structures and operation in reduced-gravity conditions by generating electric fields to manage the direction of powder deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If supporting structures are printed to support hanging structures with inclination angles less than 45 degrees, then the hanging structure can be supported during printing, but resource consumption (raw materials, printing time, energy) increases and post-processing time increases
Solution Approach 1:
The patent replaces the mechanical supporting structure system with an electric field-based Coulomb force system. By applying Coulomb force to charged powder material, the system can support hanging structures without requiring additional mechanical support structures, thereby eliminating the associated resource consumption and post-processing requirements while maintaining supporting capability.
Solution Approach 2:
The patent changes the physical state and properties of powder material by charging it, transforming it from neutral to charged particles. This parameter change enables the powder to respond to Coulomb force, allowing support of hanging structures through electric field application rather than mechanical support structures.
2Reliability
If supporting structures are printed to support hanging structures, then the hanging structure can be supported during printing, but the surface quality between the supporting structure and the workpiece deteriorates
Solution Approach 1:
By replacing mechanical supporting structures with Coulomb force application, the patent eliminates the interface between support structures and workpiece that causes surface quality deterioration. The electric field acts uniformly on charged powder throughout the build volume, supporting hanging structures without creating problematic contact surfaces.
3Ease of manufacture
If gravity is used to deposit powder material layer by layer, then the material can be deposited on the printed material layer, but the system cannot operate in reduced-gravity environments
Solution Approach 1:
The patent replaces the gravity-based deposition system with an electric field-based system using Coulomb force. By charging powder particles and applying vertical Coulomb force, the system can control powder deposition layer by layer without relying on gravity, enabling operation in reduced-gravity environments while maintaining deposition capability.
Solution Approach 2:
The patent changes the deposition mechanism from gravity-dependent to electric field-dependent by charging powder particles. This parameter change in the physical state of powder (from neutral to charged) and the driving force (from gravitational to Coulombic) enables universal operation across different gravity environments.
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 material and time consumption, enhances printing quality, and expands the applicability of additive manufacturing to complex structures and reduced-gravity environments, improving industrial applicability and efficiency.
Implementation Method 1
a Coulomb force application device, configured to apply a Coulomb force to the powder material in the forming device in a predetermined direction
Implementation Method 2
the electric field generation device includes a first electrode plate and a second electrode plate which are opposite to each other and have opposite polarities, to generate an electric field between the first electrode plate and the second electrode plate
Data Source
AI summary
An additive manufacturing system and an additive manufacturing method are disclosed including a powder supply device, configured to supply a powder material; a forming device, configured to accommodate the powder material from the powder supply device, and provide a space for printing the powder material into a workpiece; an energy source, configured to selectively apply an energy beam to the powder material in the forming device to print the powder material; and a Coulomb force application device, configured to apply a Coulomb force to the powder material in the forming device in a predetermined direction. The Coulomb force can be selectively applied to the powder material by the Coulomb force application device to provide a controlled vector force, thereby improving the industrial applicability of the additive manufacturing system and method.