Printing head for 3D printing of powder material

Abstract

The invention discloses a printing head for 3D printing of a powder material. The printing head for 3D printing of the powder material comprises a melting extrusion mechanism, a printing head body connected with the melting extrusion mechanism, and a driving mechanism. The melting extrusion mechanism is used for conveying the powder material subjected to heating melting to the printing head body. The driving mechanism is used for driving the melting extrusion mechanism. The printing head body comprises a melt pump connected with the melting extrusion mechanism. An outlet of the melt pump is connected with a nozzle mechanism. According to the printing head for 3D printing of the powder material, the temperature of the position of the nozzle is controlled actively so that the optimal viscosity and forming temperature can be provided for powder materials having different properties, and the problem that coagulation is caused due to the fact that the material temperature is decreased in the position of the nozzle, and consequentially the material cannot be extruded is solved; meanwhile, the problem that rapid forming of the materials cannot be achieved easily due to the fact that the temperature is too high is solved; the lower end of a screw is directly connected to the melt pump, a pressure sensor is additionally arranged, the real-time pressure of melt is obtained through the pressure sensor, and the rotating speed of the screw is adjusted; and different rotating speed ranges are adopted according to different materials, and the optimal extrusion pressure range is obtained.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a printing head for 3D printing powder materials. Background technique [0002] The materials used in current 3D printers are mostly PLA or ABS wires, which are extruded and conveyed by the extrusion mechanism by means of fusion deposition (FDM), melted at the nozzle and then deposited on the platform to realize 3D printing. Chinese patent application 201410425332.4 (publication number: CN104149352A) discloses a print head for a 3D printer. The print head of the above-mentioned patent can print powder materials, but the temperature of the outlet is realized by the front-end heat preservation measures and cannot be actively controlled. Molding of temperature sensitive materials is disadvantageous. The melt pressure is controlled by the one-way valve at the lower end of the screw. This method limits the extrusion pressure to the pressure value at which the one-way valve is ope...

AI Technical Summary

Problems solved by technology

Chinese patent application 201410425332.4 (publication number: CN104149352A) discloses a print head for a 3D printer. The print head of the above-mentioned patent can print powder materials, but the temperature of the outlet is realized by the front-end heat preservation measures and cannot be actively controlled. Molding of temperature sensitive materials is detrimental

The melt pressure is controlled by the one-way valve at the lower end of the screw. This method limits the extrusion pressure to the pressure value at which the one-way valve is opened, and cannot achieve continuous pressure changes. This is not necessary for powder printing, and increases The complexity of the structure and the lack of practicability

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