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

Abstract

The invention relates to a printing head, a three-dimensional printer and a three-dimensional printing method. The printing nozzle of the printing head has a vertical pipe through which molding materials pass; the switching unit is hinged on the printing head through a hinge shaft, and the switching unit has a The protruding part, the protruding part is provided with more than two nozzle holes, the outlet area of ​​each nozzle hole is different, and they are all less than or equal to the area of ​​the extrusion port of the printing nozzle, and the inlet of each nozzle hole can be switched by switching The rotation of the unit around the hinge axis selectively docks with the extrusion port; in the working state of the printing head, the restoring force of the elastic member forces the printing nozzle to stay away from the heater in the vertical direction and abut against the protruding part. The three-dimensional printer includes a frame and the like and the above-mentioned printing head. The three-dimensional printing method includes the steps of reading the data of the three-dimensional object; the step of selecting different nozzle holes for printing; and the step of moving the switching unit to a position not in contact with the printing nozzle. The print head has a simple and compact structure, which can meet different printing precision requirements.

Description

technical field [0001] The present invention relates to an extrusion device for rapid prototyping, a rapid prototyping device constructed by the extruder device and a molding method thereof, in particular to a print head for melt extrusion molding, and a device constructed by the print head Three-dimensional printer and three-dimensional printing method. Background technique [0002] A three-dimensional printer is a device that uses rapid prototyping technology to print three-dimensional objects. It is based on a digital model and uses materials such as plastic or powdered metal to print three-dimensional objects layer by layer. According to different working principles, the rapid prototyping technologies used include melt extrusion molding, laser selective sintering molding, and photocuring molding. [0003] figure 1 and figure 2 The three-dimensional printer 01 shown is a three-dimensional printer using melt extrusion molding technology, which has a frame 015 and a con...

AI Technical Summary

Problems solved by technology

A three-dimensional object is usually composed of an outer surface part and an inner filling part. In order to meet the high-precision requirements of the outer surface part, it is necessary to use a printing nozzle with a smaller caliber extrusion port; for larger three-dimensional objects, a printing nozzle with a small caliber extrusion Limited by the extrusion volume rate, it takes a lot of time to print the inner filling part that does not require high precision, which reduces the printing efficiency and increases the printing cost; if you try to modify the printing parameters of the inner filling part to reduce the size of the printing inner filling part Time, so the overall system of the 3D printer, including the software, has higher requirements

[0005] The above two 3D printers switch the small-diameter printing nozzle to the working position when printing the high-precision part of the 3D object, such as the outer surface part, and switch the small-caliber printing nozzle to the working position when printing the part of the 3D object that requires less precision, such as the inner filling part. The large-diameter printing nozzle is switched to the working position to reduce the printing time while meeting the precision requirements. However, the structure of multiple printing nozzles is relatively complicated. Printing consumables in the wrong state may stretch or drip onto the workbench, affecting printing; in addition, when printing three-dimensional objects in some special printing methods, scratches may occur on the printing surface during the process of switching printing nozzles of different calibers

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