Multi-zone Liquefier Assembly for Additive Manufacturing
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Solution Overview
Problem
Conventional liquefiers in extrusion-based additive manufacturing systems face limitations in building speed due to fixed heated lengths, which result in either high flow rates with slow response times or low flow rates with fast response times, depending on the length of the heated section, making it difficult to efficiently build 3D models with varying geometries and support structures.
Innovation Solution
The introduction of a liquefier assembly with multiple, independently heatable zones allows for adjustable heatable length, enabling the system to switch between short and long heated lengths based on the specific requirements of the build process, such as fast response times for tracing surface details or high flow rates for interior fill patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the heated length of the liquefier is increased to achieve high flow rates, then the response time becomes slow
Solution Approach 1:
The liquefier tube is divided into multiple independently heatable zones along its length. Each zone can be controlled separately by individual heating elements, allowing the system to activate only the necessary heated sections based on the current printing requirements, thus achieving both high flow rates (when more zones are heated) and fast response times (when fewer zones are heated).
Solution Approach 2:
The system dynamically adjusts the heated length of the liquefier by selectively activating or deactivating specific heating zones based on real-time printing needs. This dynamic control allows the liquefier to adapt its thermal characteristics, providing long heated sections for high flow rate requirements and short heated sections for fast response time requirements during different phases of the printing process.
2Adaptability or versatility
If the heated length is fixed, then the system cannot adapt to varying build requirements for different geometries and support structures
Solution Approach 1:
The liquefier tube is segmented into multiple independently controllable heating zones, each with its own heating element. This segmentation allows the system to adapt to varying build requirements by activating only the necessary zones for specific printing tasks, such as using longer heated sections for support structures requiring high flow rates and shorter sections for detailed surface work requiring fast response times.
Solution Approach 2:
The multi-zone liquefier assembly provides universal functionality by being capable of operating in multiple modes within a single device. The same liquefier can switch between different heated lengths and thermal configurations to handle diverse printing requirements including various geometries, support structures, and material deposition patterns, eliminating the need for multiple specialized liquefiers.
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 solution enables the extrusion-based additive manufacturing system to achieve both fast response times and high flow rates adaptively, improving the overall efficiency and speed of building 3D models by allowing the liquefier assembly to adjust its heatable length dynamically according to the toolpath and material deposition needs.
Implementation Method 1
a first thermal unit operably secured to the liquefier tube adjacent the first end of the liquefier tube, and a second thermal unit operably secured to the liquefier tube between the first thermal unit and the second end of the liquefier tube
Implementation Method 2
at least partially melting a portion of a filament of a thermoplastic material within the first segment of the liquefier tube
Data Source
AI summary
A liquefier assembly for use in an extrusion-based additive manufacturing system, and a method for building a three-dimensional model with the extrusion-based additive manufacturing system, where the liquefier assembly includes a liquefier tube having multiple, independently heatable zones along a longitudinal length of the liquefier tube.