Printing head, three-dimensional printer and three-dimensional printing method

Abstract

The invention relates to a printing head for a three-dimensional printer, and further relates to the three-dimensional printer constructed with the printing head and a method for printing a three-dimensional body by utilizing the three-dimensional printer. The printing head comprises a liquefier and an adjustment unit, wherein the adjustment unit comprises an adjustment disc; an upper disc surface of the adjustment disc is arranged below the liquefier in a mode of clinging to the end face of an outlet end of the liquefier; the adjustment disc can rotate around a vertical shaft relative to the liquefier; a first extrusion hole is formed in one of an end wall of the outlet end of the liquefier and the adjustment disc, and more than two second extrusion holes are formed in the other one of the end wall of the outlet end of the liquefier and the adjustment disc; the effective aperture of each second extrusion hole is different, and is less than or equal to that of the first extrusion hole; and through the rotation of the adjustment disc around the vertical shaft relative to the liquefier, the first extrusion hole is butted with one of the second extrusion holes selectively. According to the printing head, the effective apertures of the extrusion holes can be adjusted according to the requirements of the printing accuracy, and the printing efficiency of the three-dimensional printer is improved.

Description

technical field [0001] The present invention relates to an extruding device for rapid prototyping, a rapid prototyping device constructed by the extruding device and a forming method capable of forming by using the rapid prototyping device, in particular, to a prototyping device for melt extrusion molding A printing head, a three-dimensional printer constructed by the printing head and a method for printing a three-dimensional object by using the three-dimensional printer. Background technique [0002] A 3D printer is a device based on a digital model of a 3D object, using materials such as plastic, liquid photocurable resin, and powdered metal to construct a 3D object by layer-by-layer printing. [0003] The background technology of the patent document whose publication number is CN1216726C describes a kind of three-dimensional printer that supplies molding materials to the printing head in the form of filaments, see figure 1 , the three-dimensional printer 01 has a printi...

AI Technical Summary

Problems solved by technology

However, after the printing nozzle is switched from the working state to the standby state, the phenomenon of "glue overflow" usually occurs, that is, under the action of the feeding inertia of the feeding roller and the vibration of the printing head during the variable speed movement, the molten state in the printing nozzle is formed. The material will continue to be extruded from the printing nozzle and drip onto the printing surface of the 3D object, reducing the printing accuracy of the 3D object

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