Linear Actuation Gripper for Brittle 3D Printing Feedstock
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Solution Overview
Problem
Current 3D printing technologies face challenges in efficiently extruding metal and ceramic materials due to their brittleness, leading to issues like slipping, stripping, and deformation, which affect print quality and speed, especially when using roller-type extrusion designs.
Innovation Solution
The implementation of a linear actuation system that pushes and grips the build material without relative motion between the actuator and the material, using a pusher with a lead screw and motor-driven actuating component, and a gripper applying opposing lateral forces to ensure consistent and high-speed extrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If roller-type extrusion design is used for metal and ceramic materials, then extrusion force can be applied, but slipping, stripping, and deformation occur due to material brittleness
Solution Approach 1:
The patent replaces the roller-type mechanical extrusion system with a linear actuation system that uses a lead screw mechanism. This substitution eliminates the relative motion and friction between rollers and brittle material, preventing slipping and stripping while maintaining effective extrusion force application through the linear actuator's direct push action.
Solution Approach 2:
The extrusion system is segmented into distinct functional components: a linear actuator for force application, a lead screw for motion conversion, and a separate gripping mechanism. This segmentation allows each component to perform its specific function optimally without the interference that causes deformation in integrated roller systems.
2Productivity
If roller-type extrusion is used, then material can be fed into the extrusion head, but relative motion between actuator and material causes slipping and stripping
Solution Approach 1:
The patent replaces the roller-based mechanical transmission system with a linear actuation system using a lead screw. This substitution eliminates relative motion between the actuating surfaces and the build material, ensuring that the material is pushed consistently without slipping or stripping, thereby maintaining both high delivery speed and extrusion consistency.
Solution Approach 2:
The lead screw acts as an intermediary mechanism between the linear actuator and the build material. It converts the actuator's linear motion into precise, controlled pushing motion while maintaining direct contact without relative slipping, ensuring reliable and consistent material delivery to the extrusion head.
3Productivity
If high-speed extrusion is attempted with brittle materials, then production time is reduced, but deformation increases affecting layer height precision
Solution Approach 1:
The patent replaces the roller extrusion system with a linear actuation system that applies force directly along the material's longitudinal axis. This substitution allows high-speed extrusion without the lateral friction and relative motion that cause deformation in roller systems, maintaining layer height precision even at increased production speeds.
Solution Approach 2:
The linear actuation system provides dynamic, controllable force application that can be precisely adjusted during operation. This allows the system to maintain optimal pushing force at high speeds, preventing deformation while achieving fast production rates, unlike static roller systems that cannot adapt to speed changes.
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 the delivery of thermoplastic or metal feedstock at a desired speed and consistency, reducing deformation and improving print quality by eliminating slipping and stripping, enabling the production of complex features with fine layer heights and reduced production time.
Implementation Method 1
The actuating component may be a lead screw and the driving component may be a motor
Implementation Method 2
The linear guide and the linear bearing may be arranged to absorb a load otherwise transferred to the actuating component due to application of the axial force
Implementation Method 3
The actuation assembly may further include a cam arranged to cause the pushing component to transition between a media load position and a media extrude position as a function of surface contact between the cam and the pushing component
Data Source
AI summary
A system and corresponding method to move build material in a three-dimensional (3D) printing system uses a gripper. The gripper is arranged to apply at least two opposing lateral forces to the build material. The at least two opposing lateral forces are applied to the build material, in conjunction with linear motion of the gripper, for at least a portion of a path the build material travels toward an extrusion head.