3D Printer Head with Induction-Heated Embedded Channel
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Solution Overview
Problem
Traditional metal three-dimensional printing methods face challenges such as porosity and warping issues in powder metal printing and lower resolution due to uncontrolled melt pool geometry in wire metal printing, limiting the production of high-performance, complex metal parts.
Innovation Solution
A three-dimensional printer head with a heat-resistant, low-electric conductivity nozzle featuring an embedded channel and an induction coil to inductively heat solid metal material, producing a continuous bead of liquid or semisolid metal for precise deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire metal printing is used, then porosity is reduced compared to powder metal printing, but melt pool geometry and droplet size are not precisely controlled resulting in wider bead widths and lower resolution
Solution Approach 1:
The patent applies parameter changes by precisely controlling the electrical current parameters passed through the wire in the embedded channel. By modulating the current amplitude and duration, the melt pool geometry and droplet size are precisely controlled, achieving narrow bead widths while maintaining low porosity. This resolves the contradiction by optimizing the electrical parameters to simultaneously achieve both reliability and manufacturing precision.
Solution Approach 2:
The patent replaces traditional mechanical wire feeding and melting systems with an electrical current-based system. Electrical current is passed through the embedded channel to heat and melt the wire material in a controlled manner, substituting mechanical control with electrical field control. This enables precise control of melt pool geometry and droplet ejection, achieving narrow bead widths while maintaining low porosity through non-contact, precisely controllable energy delivery.
2Reliability
If traditional wire metal printing is used, then porosity is lower than powder metal printing, but the process does not constrain or precisely control melt pool geometry resulting in lower-resolution parts
Solution Approach 1:
The patent replaces traditional thermal conduction-based wire heating with direct electrical current heating through the embedded channel. This substitution allows precise spatial and temporal control of heat input, constraining melt pool geometry to produce narrow, well-defined beads. The electrical field enables precise control of melting location and duration, achieving high resolution while maintaining low porosity through controlled material deposition.
Solution Approach 2:
The patent applies local quality by concentrating electrical current heating specifically within the embedded channel at the wire deposition location. This creates a localized melt zone with precise geometric control, ensuring that heating and melting occur only where needed. The localized electrical energy input produces controlled melt pool geometry and narrow bead widths, achieving high measurement precision while maintaining the porosity reduction benefits of wire-based printing.
3Adaptability or versatility
If powder bed fusion is used, then metal parts can be manufactured with complex features, but porosity and warping issues occur due to powder particle topology and thermal energy input
Solution Approach 1:
The patent replaces thermal conduction heating of powder or wire with direct electrical current heating through the embedded channel. This substitution provides more precise and controllable energy input, reducing excessive thermal energy that causes warping and porosity. The electrical field enables controlled melting and solidification, producing dense, warp-free metal parts while maintaining the ability to manufacture complex features through precise material deposition control.
4Ease of manufacture
If directed energy deposition is used, then metal parts can be manufactured, but printer build volumes and power removal from printed parts limit part complexity
Solution Approach 1:
The patent replaces conventional directed energy deposition using external lasers or electron beams with an embedded electrical current heating system. This substitution eliminates the need for complex external energy delivery systems and large build volumes. The embedded channel delivers electrical energy directly to the wire material, enabling precise material deposition with minimal equipment footprint, thus achieving ease of manufacture while supporting high part complexity through controlled layer-by-layer construction.
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
Enables high-resolution metal printing with controlled bead width and reduced porosity, enhancing the capability to produce complex metal parts with improved performance.
Implementation Method 1
an induction coil surrounding an outer surface of the nozzle and extending over a substantial portion of the longitudinal length of the nozzle; a coil driver modulating the induction coil at a frequency sufficient to produce a magnetic field capable of passing through the nozzle to heat the solid metal material within the embedded channel inductively
Data Source
AI summary
The three-dimensional printer head for printing metal articles, the printer comprises a nozzle that is cylindrical and manufactured from a heat-resistant material with low electric conductivity, an embedded channel within the nozzle and running along a longitudinal length of the nozzle; a receiving space at a first end of the embedded channel in which a solid metal material is received; an extrusion space at a second end of the embedded channel from which a continuous bead of liquid or semisolid metal material is extruded, a feeder mechanism that continuously drives the solid metal material into the embedded channel through the receiving space, an induction coil surrounding an outer surface of the nozzle and extending over a substantial portion of the longitudinal length of the nozzle.