3D printer head with replaceable nozzle for rapidly forming large products

Abstract

A 3D printer head with a replaceable nozzle for rapidly forming large products can solve the problem that a conventional FDM 3D printer has a low printing speed and makes it difficult to form large products. The 3D printer head mainly comprises a melt extrusion unit, a nozzle group unit, and a nozzle conversion driving unit. The melt extrusion unit is a single screw extruder. The nozzle group unitis composed of an inner core valve, a compression cover, a thrust needle bearing, a nozzle fixing cover, a nozzle, a sealing ring and a rubber ring. The nozzle conversion driving unit consists of a motor and a gear. When printing a large product, the 3D printer head firstly use the slicing software to perform a multi-stage shelling and slicing process on a model, so that the filling distances between two wires in each layer gradually decrease from the inside to the outside according to the number of shelling stages. The innermost part of the model is filled with a wide path by a large nozzle.The middle part of the model is filled with a narrow path by a smaller nozzle. The outermost part of the model is filled with the narrowest path by the smallest nozzle. The 3D printer head can greatly increase the printing speed of large products and ensure the forming accuracy.

Description

technical field [0001] The invention relates to the field of FDM 3D printing, in particular to a replaceable nozzle 3D printer head for rapid prototyping of large-scale products. Background technique [0002] In the field of traditional FDM 3D printing, the forming equipment is mainly a small equipment that can transport resin filaments and melt and accumulate them. The printing width is small, and the forming size of the product is strictly limited by the size of the forming platform. It is difficult to form large or even super large Dimensional products. [0003] The emergence of 3D printers with a relatively large forming platform has lifted the limitation of the product forming size in the FDM process to a certain extent, but for the forming of large products, it still takes a lot of time due to the limitation of the size of the consumables. Replacing consumables with a larger diameter and selecting a nozzle with a larger aperture can solve the problem of low forming ef...

AI Technical Summary

Problems solved by technology

[0002] In the field of traditional FDM 3D printing, the forming equipment is mainly a small equipment that can transport resin filaments and melt and accumulate them. The printing width is small, and the forming size of the product is strictly limited by the size of the forming platform. It is difficult to form large or even super large Dimensions of products

[0003] The emergence of 3D printers with a relatively large forming platform has lifted the limitation of the product forming size in the FDM process to a certain extent, but for the forming of large products, due to the limitation of consumable size specifications, it still takes a lot of time

Replacing consumables with a larger diameter and selecting a nozzle with a larger aperture can solve the problem of low forming efficiency, but the printing accuracy decreases with the increase of the diameter of the nozzle. Therefore, in the FDM forming process, it is difficult to balance printing efficiency and printing accuracy at the same time

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