3D Printing Inert Gas Trajectory Control
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Solution Overview
Problem
Current 3D printing technologies face challenges in printing overhangs and unsupported structures without the need for support materials, which can result in drooping, sagging, or prohibition of desired shapes due to gravity and structural limitations, and often require complex setups like the 4th-axis that may cause physical interference.
Innovation Solution
The method involves ejecting print material in a vertical trajectory and using directed streams of inert gases, such as argon, to alter the drop path, allowing drops to adhere to the part at non-perpendicular angles, eliminating the need for support structures and avoiding physical interference with the printhead and Z-axis hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If support structures are used to provide mechanical support for overhanging structures, then the structural stability is improved, but the device complexity and ease of manufacture deteriorate due to difficult removal and rough surface finish
Solution Approach 1:
The patent removes the support structure entirely from the system by using inert gas to alter drop trajectories, allowing overhangs to be printed directly without additional support material. This eliminates the complexity of support structure removal and surface finishing while maintaining structural stability during printing.
Solution Approach 2:
Inert gas is introduced as an intermediary substance between the ejected drop and the overhanging surface. The inert gas modifies the drop's flight path and impact characteristics, enabling the drop to adhere properly to the overhang without requiring mechanical support structures.
2Ease of manufacture
If a 4th-axis is used to tilt the X-Y stage to orient the object for printing overhangs, then the ease of manufacture is improved by eliminating support material, but the device complexity worsens due to physical interference between the printed part and printhead hardware
Solution Approach 1:
The patent extracts the trajectory modification function from the mechanical 4th-axis tilt mechanism and implements it through inert gas flow. This eliminates the need for physical tilting hardware and avoids the associated mechanical interference problems while achieving the same manufacturing benefit.
Solution Approach 2:
The patent replaces the mechanical 4th-axis tilt system with a pneumatic/inert gas-based trajectory control system. Instead of physically tilting the print stage to orient overhangs, inert gas is used to alter the drop's flight path, substituting a mechanical solution with a fluid dynamic one that avoids physical interference.
3Manufacturing precision
If drops are ejected in a substantially vertical trajectory, then the manufacturing precision is improved for standard surfaces, but the adaptability worsens for printing overhangs and complex geometries
Solution Approach 1:
The patent introduces dynamic control of drop trajectories through inert gas flow that can be adjusted for different printing conditions. The system can switch between vertical trajectories for standard surfaces and angled trajectories for overhangs by modifying the inert gas flow, providing adaptability without sacrificing precision.
Solution Approach 2:
The patent changes the trajectory parameter (angle) of the dropped material by using inert gas to alter the drop's flight path. This parameter change enables the same vertical ejection system to handle both standard surfaces and overhangs, improving adaptability while maintaining manufacturing precision through controlled trajectory modification.
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 enables the printing of complex geometries without support materials, improving surface finish and reducing post-processing requirements, while avoiding the need for a 4th-axis, thus enhancing the versatility and efficiency of 3D printing.
Implementation Method 1
directing a stream of inert gas toward the drop of print material from a first direction, and diverting the drop of print material from the substantially vertical trajectory
Data Source
AI summary
A method of forming a three-dimensional printed part is disclosed, including ejecting a drop of print material from an ejector for a printing system in a substantially vertical trajectory, directing a stream of inert gas toward the drop of print material from a first direction, and diverting the drop of print material from the substantially vertical trajectory prior to the drop of print material landing onto a surface. The method includes directing a stream of inert gas toward the drop of print material from other directions. A printing system includes at least a first channel oriented in a first plane parallel to the substrate and positioned between the substrate and the ejector, and a gas supply connected to the first channel.