Abstract
Micro-droplet jetting manufacture is a new 3D printing technology developed in recent years. Presently, this new technology mainly aims at ejecting a low-viscosity medium. Therefore, a device for ejecting high-viscosity molten liquid is designed by analyzing the injection principle of high-viscosity molten liquid. Initially, the cooling mechanism is designed to overcome the defect that the piezoelectric stacks cannot operate in high-temperature conditions. Thereafter, the mathematical model of the liquid velocity in the nozzle is derived, and the factors influencing injection are verified by Fluent. Subsequently, a prototype of the jet printer is fabricated, and the needle velocity is tested by the laser micrometer; the relationship between voltage difference and the needle velocity is also obtained. The experimental results matched the theoretical model well, showing that the voltage difference, needle radius, nozzle diameter, and taper angle are closely related to the injection performance of the 3D jet printer. By using a needle with a radius of 0.4 mm, a nozzle with a diameter of 50 μm, a taper angle of 90°, a supply pressure of 0.05 Mpa, and a voltage difference of 98 V, a molten liquid with a viscosity of 8000 cps can be ejected with a minimum average diameter of 275 μm, and the variation of the droplet diameter is within ±3.8%.
Highlights
Scholars have conducted extensive research on the theory and technology of MJDM due to its considerable advantages
Micro-droplet jetting manufacture (MDJM) is a new 3D printing technology developed in recent years
The thermodynamic analysis of the jet printer reveals that the cooling mechanism can be designed to effTechteivtehlyerrmedoudcyentahmeitcemanpaelryastius roefduthreinjgetthperoinpteerratrieovneaolfsththeaptiethzoeecleocotlriincgstamcekc.hTahnuissm, evceann thbee ldimesiitgcnoenddtiotioenffeccatnivbeelysaretidsuficeed.the temperature during the operation of the piezoelectric stack
Summary
Scholars have conducted extensive research on the theory and technology of MJDM due to its considerable advantages. Dalian University of Technology built a piezoelectric pulse micropore injection system and sprayed droplets of Sn63Pb37 eutectic alloy [14]. The stackTmheursmt boedypnroapmeirclysicmooulleadtiotonpisretvheennt citafrrroiemd boeuint,gadnadmaapgreodpbeyr ostvreurchteuarteinisg.designed to reduce the heat of the piezoelectric stack when operating at high frequency. A layer of PEEK insulation is added between the drive frame and liquid chamber to reduce the heat transferred by the heater. A layer of heat sink is placed around the piezoelectric stack, and air flows through its. A layer of heat sink is placed around the piezoelectric stack, and air flows itnhtreoruiogrh. The thermodynamic analysis of the jet printer reveals that the cooling mechanism can be designed to effTechteivtehlyerrmedoudcyentahmeitcemanpaelryastius roefduthreinjgetthperoinpteerratrieovneaolfsththeaptiethzoeecleocotlriincgstamcekc.hTahnuissm, evceann thbee ldimesiitgcnoenddtiotioenffeccatnivbeelysaretidsuficeed.the temperature during the operation of the piezoelectric stack.
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