Novel screw rod type nozzle with fused deposition forming technology

Abstract

The invention provides a novel screw rod type nozzle with fused deposition forming technology. The novel screw rod type nozzle comprises a motor, a motor end cover, a rolling bearing, an electromagnetic heating ring, a bolt, a nozzle, a U-shaped bearing, a customized gear, a preheating device, a heating rod, a material channel, a molten pool, a screw rod extruding device, a material cylinder and thermoplastic materials. The electromagnetic heating ring is arranged on the outer boundary of the material cylinder and replaces an original heating block device; and the screw rod extruding device isarranged in a molten pool, and an original straight barrel type feeding device is replaced. According to the novel screw rod type nozzle, the preheating device is arranged, so that the thermoplasticmaterials flow into the molten pool after reaching the semi-molten state. The electromagnetic heating ring is arranged on the periphery of the material cylinder, so that the thermoplastic materials can be uniformly heated, and the phenomenon that the fusion material is "cast" due to the fact that the local temperature is too high in the process of using the heating rod is avoided. The molten poolis mainly added, so that the evolution of the fused deposition forming technology from the desktop level to the industrial level is promoted.

Description

technical field [0001] This patent relates to the field of 3D printing technology, and specifically introduces a new type of fused deposition modeling technology screw nozzle. Background technique [0002] Fused deposition modeling technology is a kind of rapid prototyping technology. This process technology is to extrude a filamentous material such as thermoplastic, metal or wax melt from a heated nozzle, and perform melt deposition manufacturing at a certain rate according to the preset trajectory of each layer of the molded part. Every time a layer is printed, the worktable is lowered by one layer thickness or the nozzle is raised by one layer thickness to superimpose and deposit a new layer, and this process is repeated to finally realize the deposition and molding of the part. [0003] The most critical structure of the fused deposition molding process is the nozzle part. The design rationality of its mechanical structure is directly related to whether the molding proc...

AI Technical Summary

Problems solved by technology

Among them, they all adopt the method of heating after feeding first. When the thermoplastic material passes through the throat until it is sprayed out, the heating block melts it and produces a phase change. Faults appear in the filament, or due to the influence of unstable heating temperature, the phase change of thermoplastic materials is uneven when heated, resulting in easy plugging of the nozzle or uneven sprayed filament, which affects the surface roughness of the printed product

At the same time, although the existing nozzle structure has a simple feeding mechanism, smart and light, and continuous feeding, it is only suitable for small and medium-sized desktop 3D printers due to the small amount of feeding. In addition, due to the influence of heating temperature and material quality , The melt heater is often blocked, which leads to the interruption of the printing process and affects the continuity of product printing

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