A desktop low-melting point metal three-dimensional printer nozzle

Abstract

The invention belongs to the field of equipment of the three-dimensional printing technology, and particularly relates to a spray nozzle of a tabletop low-melting-point metal three-dimensional printer. The spray nozzle comprises a melting material feeding device, a spray nozzle body, a melting material discharging device, a piston piece, a gas pressure controller, a gas pressure meter and a heating piece; the spray nozzle body is used for storing and spraying out melting materials, a gas pressure bin and a melting material bin are arranged in a spray nozzle shell, the gas pressure bin and the melting material bin are separated through the piston piece, and the gas pressure bin is connected with the gas pressure controller and is used for adjusting gas pressure in the gas pressure bin and gas pressure in the melting material bin; the gas pressure meter is arranged on the gas pressure bin, and pressure value in the gas pressure bin is displayed; and low-melting-point metal is adopted to serve as a printing material, the structure is novel, the gas pressure bin is additionally arranged in the spray nozzle, the pressure in the melting material bin is indirectly controlled through the gas pressure bin, the pressure value inside the melting material bin can be visually reflected, control precision is high, the pressure relief speed is high, the phenomena of excessive printing and material dragging are avoided, the precision of finished products is high, the unnecessary technology is removed, and the printing efficiency is improved.

Description

technical field [0001] The invention belongs to the field of three-dimensional printing technology equipment, and in particular relates to a nozzle of a desktop low-melting-point metal three-dimensional printer. Background technique [0002] Three-dimensional printer, also known as three-dimensional printer, referred to as 3DP. 3D printer is a process of rapid prototyping. It adopts layer-by-layer accumulation to produce 3D models. Its operation process is similar to that of traditional printers, except that traditional printers print ink onto paper to form two-dimensional plane drawings. The 3D printer uses liquid photosensitive resin materials, molten plastic filaments, gypsum powder and other materials to form three-dimensional entities by stacking them layer by layer by spraying binders or extruding them. [0003] The 3D entities printed by 3D printers are large or small, and there are differences in printing. In order to meet the size requirements of the printed entiti...

AI Technical Summary

Problems solved by technology

[0003] The 3D entities printed by 3D printers are large and small, and there are differences in printing. In order to meet the size requirements of the printed entities, the body of the 3D printer is generally large, which results in low accuracy when printing smaller entities.

It is difficult to develop low-melting-point alloys as printing materials, because the melting point of low-melting-point metals is low. When the computer activates the system to start the preheating process, the air inside the nozzle will expand after being heated for a long time, and the pressure inside the nozzle will increase significantly. During the preheating process of the nozzle, part of the molten material will flow out from the nozzle, forming redundant printing, which will have a fatal impact on the accuracy of the finished product

During the printing operation, the molten low-melting point metal material is easy to solidify, which requires continuous heating, high production cost and complicated production process

After the printing job is finished, the computer shuts down the system to end the printing. Although the pressurization stops, the pressure in the melting bin is still greater than the external pressure, and the pressure cannot be released immediately. The molten material in the melting bin will still flow out, and the nozzle is not completely broken, resulting in Form drag

The follow-up process must increase the work of removing residual materials and grinding, which will reduce printing efficiency and affect the accuracy of finished products

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