Induction-Heated Metal Extruder for 3D Print Shape Control
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Solution Overview
Problem
Existing metal extruders for 3D printing face challenges in achieving improved extrusion performance, controlling metal material shape, and enhancing adhesion between extruded metal layers, which are crucial for efficient and precise metal material deposition in 3D printing processes.
Innovation Solution
An extruder utilizing an induction heating method with a coil configuration that includes multiple coils to control the temperature and shape of the metal material, featuring a cylinder and nozzle with non-magnetic materials, and a control unit to adjust the current flowing through the coils for precise temperature management and shape control of the extruded metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional heating methods are used to melt metal material, then heating uniformity is poor and energy consumption is high, but induction heating with coil configuration improves heating efficiency and temperature control precision
Solution Approach 1:
The patent replaces traditional mechanical contact heating methods with induction heating technology. The induction heating coil generates a magnetic field that induces eddy currents in the metal material, converting electromagnetic energy directly into heat within the material itself. This substitution eliminates the need for physical contact heaters and significantly improves heating efficiency while enabling precise temperature control through electrical parameter adjustment.
Solution Approach 2:
The patent utilizes the ability to change electrical parameters (current frequency, amplitude, and phase) of the induction heating coil to precisely control the heating process. By adjusting these parameters, the system can optimize heating efficiency for different metal materials and geometries, while also controlling the distribution and intensity of the magnetic field to achieve uniform heating without increasing mechanical complexity.
2Manufacturing precision
If simple heating method is used, then temperature control precision is low and extrusion shape control is poor, but multiple coils with different configurations improve temperature and shape control precision
Solution Approach 1:
The patent divides the heating system into multiple independent induction coils positioned at different locations and orientations. Each coil can be independently controlled to heat specific regions of the metal material or nozzle. This segmentation allows precise localized temperature control, enabling complex shape extrusion by selectively heating different zones to control material flow and solidification patterns during extrusion.
Solution Approach 2:
The patent applies different heating characteristics to different locations by using coils with varying parameters (turns, diameter, spacing, power). This creates localized heating zones with specific temperature profiles matched to the requirements of different extrusion regions. For example, higher intensity heating may be applied at the nozzle tip to maintain material flow, while cooler zones allow controlled solidification for shape definition.
3Strength
If metal material is extruded without sufficient heating, then adhesion between layers is poor, but excessive heating increases energy consumption and may cause material degradation
Solution Approach 1:
The patent applies induction heating in advance to preheat the metal material to the optimal temperature range before extrusion begins. The system also maintains heating during the extrusion process to ensure continuous adhesion. This preliminary and continuous heating action ensures that the metal material has sufficient temperature and viscosity for proper layer bonding without requiring excessive overall energy input, as heating is applied only when and where needed.
Solution Approach 2:
The patent implements continuous induction heating throughout the extrusion process rather than intermittent heating. The induction coil maintains a steady magnetic field that continuously heats the metal material as it flows through the extrusion zone. This continuous heating ensures consistent adhesion between layers by maintaining optimal material temperature throughout the entire extrusion operation, improving bond strength while optimizing energy efficiency through sustained rather than repeated heating cycles.
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 enhanced extrusion performance, precise control over the extruded metal shape, and improved adhesion between metal layers, leading to more efficient and accurate metal deposition in 3D printing processes.
Implementation Method 1
an upper coil provided on an outer surface of the cylinder and configured to melt the solid metal material to form a liquid metal material; the upper coil may produce a magnetic field inside the cylinder in order to induction heat the cylinder and the solid metal material
Implementation Method 2
the first lower coil may produce an induction current on the surface of the liquid metal material inside the nozzle in order to control the extruded shape of the liquid metal material
Implementation Method 3
the second lower coil may produce a magnetic field passing through the extruded metal material in order to induction heat the metal material
Data Source
AI summary
An extruder for a metal material includes a cylinder having a receiving space in which a solid metal material is provided, a nozzle extending from a lower end of the cylinder, an upper coil provided on an outer surface of the cylinder and melting the solid metal material to form a liquid metal material, and a first lower coil provided on an outer surface of the nozzle to control an extruded shape of the liquid metal material.