Extrusion Head Cooling and Solid-State Cutting for Multi-Material 3D Printing
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Solution Overview
Problem
Existing additive manufacturing systems face challenges in producing complex shapes with high processing speeds and accuracies, particularly when multiple materials are required, and current extrusion heads often deform or fail to cleanly cut extrusion material, leading to inefficiencies and reliability issues.
Innovation Solution
An extrusion head with a separating device and cooling mechanism that cuts extrusion material in a solid state below its melting temperature, using a blade element to minimize deformation and ensure clean cuts, combined with a displacement unit and liquefying assemblies for reliable processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If extrusion material is cut after extrusion using conventional cutting devices, then the material can be separated, but the material is deformed during cutting and cobweb-like thread formation occurs
Solution Approach 1:
The patent changes the temperature parameter of the extrusion material from a softened state (above glass transition temperature) to a solid state (below glass transition temperature) at the cutting point. This is achieved by cooling the extrusion material immediately before cutting, which eliminates deformation and cobweb formation while maintaining clean cuts and high process reliability
Solution Approach 2:
The patent introduces a cooling device as an intermediary between the extrusion process and the cutting process. This cooling device acts as a mediator that temporarily reduces the temperature of the extrusion material below its glass transition temperature, allowing clean cutting without deformation, and then the material is reheated or continues processing in its normal state
2Productivity
If high nozzle temperatures are used for processing high-performance plastics, then the material can be extruded, but heat diffusion to the cutting point causes softening and cutting problems
Solution Approach 1:
The patent segments the temperature control into distinct zones: the extrusion zone maintains high temperature for material processing, while the cutting zone is actively cooled to low temperature for clean cutting. This spatial segmentation of temperature control allows both high productivity in extrusion and high precision in cutting to coexist
Solution Approach 2:
The cooling device serves as a thermal intermediary that blocks heat diffusion from the hot extrusion zone to the cutting zone. It creates a thermal barrier that allows the nozzle to operate at high temperatures for efficient processing while keeping the cutting point cool for clean separation
3Adaptability or versatility
If complex shapes with undercuts are manufactured using single material, then design flexibility is achieved, but support structures are required which complicates the process
Solution Approach 1:
The patent uses parameter changes (temperature control) to enable clean separation of different materials during extrusion. This allows support structures made from different materials to be easily separated from the main product after printing, reducing the complexity of support removal and enabling greater design flexibility for complex shapes with undercuts
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 enables cleaner cutting and higher process reliability, allowing for precise and efficient manufacturing of complex shapes with multiple materials, addressing the limitations of current systems.
Implementation Method 1
at least one cooling device is provided for cooling the at least one displacement unit and/or the separating device
Implementation Method 2
The at least one extrusion material can be introduced into a first liquefying assembly and the upper end of the extrusion material separated by the separating device can be introduced into a second liquefying assembly
Data Source
AI summary
An extrusion head for additive manufacturing of a product includes a material feed unit for feeding an extrusion material, preferably in filament form, a separating device for the extrusion material, and optionally a displacement unit with at least two liquefying assemblies. The extrusion material can be introduced into a first liquefying assembly, and the upper end of the extrusion material separated by the separating device can be introduced into a second liquefying assembly. A cooling device is provided for cooling the displacement unit and/or the separating device.