Electromagnetic induction type rapid metal melting spray head for 3D metal printer

[0023] in figure 1 Among them, the electromagnetic induction type rapid metal melting nozzle used for 3D metal printer consists of nozzle (R), crucible (C), insulation layer (A), medium and high frequency inverter power supply (P), electromagnetic induction coil (B), and cooling device (D) The composition of the metal to be melted (M) and the feeding device (S). The electromagnetic induction coil (B) surrounds the crucible (C) through the thermal insulation layer (A), the cooling device (D) provides cooling for the electromagnetic induction coil (B) and the medium and high frequency inverter power supply (P), and the medium and high frequency inverter power supply (P) Drive the electromagnetic induction coil (B), so that the metal to be melted (M) in the crucible (C) is quickly melted by electromagnetic induction to form a metal fluid or liquid (L), and the metal fluid or liquid (L) is sprayed through the nozzle (R) Out. As for the ejection method, several currently mature methods can be used, such as piezoelectric, pneumatic, electric piston, etc. (3D Printing Technology by Wang Yungan et al., Huazhong University of Science and Technology Press), which will not be repeated here.

[0024] in figure 2 In the block diagram of the basic circuit structure of the embodiment of the present invention shown, the structure is formed by connecting a medium and high frequency inverter power supply (P) and an electromagnetic induction coil (B).

[0025] in image 3 In the schematic circuit diagram of the embodiment shown, two field effect transistors Q1, Q2 and their peripheral components form a standard LC resonant frequency selective oscillation circuit, and its resonant frequency f0=1/[2π√(BC1)], here The designed frequency range is 200Hz to 2MHz. +V supplies power to the entire oscillator circuit. B is both an LC resonance frequency-selective inductor and an electromagnetic induction coil. It surrounds the crucible and induces heating of the metal in the crucible to quickly melt the metal. In this way, cost-effective 3D metal printing is realized, and the energy conversion efficiency is high, and it can provide a higher deposition rate, a smaller oxide layer, higher security, fast printing, and the manufacture of large-size metal components.