A temperature control structure of fdm nozzle

Abstract

The invention relates to the technical field of 3D printing, and discloses a temperature control structure of an FDM nozzle, which includes a extrusion nozzle and a feeding assembly, the lower end of the feeding assembly is fixedly connected with a preheating chamber, and the outer side of the preheating chamber The wall is fixedly mounted with a heating block. The temperature control structure of the FDM nozzle, due to the cooperation of the central branch tube and the heating wire, directly heats the printing material that is not well melted at the axis, making the temperature distribution of the printing material more uniform, and secondly improving the heating efficiency and relatively reducing the power consumption. At the same time In the present invention, the heating is divided into two ends, and the temperature of the upper part is lower, so that the influence on the temperature of the upper feed inlet is lower, which reduces the influence on the feed inlet. In addition, because the heating efficiency is improved, relatively speaking , the heating section can be shortened, reducing the size of the equipment, making it smaller in mass, more flexible in the printing process, easier to control, and improving printing accuracy.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to an FDM nozzle temperature control structure. Background technique [0002] FDM 3D printing is based on digital model files, heats and melts thermoplastic materials, and constructs objects by extruding layer by layer. Due to the bonding performance, accumulation performance, filament flow and extrusion of liquid materials at different temperatures The width of the wire has a great influence, and the temperature control is more important in the 3D printing process. [0003] see figure 1 , the wire feeding structure sends the filamentous printing material into the printing nozzle through the motor to melt and print, and the heating device in the printing nozzle heats the filamentous printing material fed by the wire feeding mechanism to a molten state, but for large-size The heat from the heat is in contact with the outer periphery of the printing material, and it takes a cert...

AI Technical Summary

Problems solved by technology

[0003] see figure 1 , the wire feeding structure sends the filamentous printing material into the printing nozzle through the motor to melt and print, and the heating device in the printing nozzle heats the filamentous printing material fed by the wire feeding mechanism to a molten state, but for large-size The heat from the heat is in contact with the outer periphery of the printing material, and it takes a certain amount of time to transfer to the center of the printing material, resulting in uneven heating between the outer periphery and the axis of the printing material. The temperature of the inner and outer layers is different, and the thermal properties are different, which affects the quality of the final printed matter.

[0004] Furthermore, due to the different heating efficiencies of the inner and outer layers, the final heating efficiency is reduced. In order to achieve the goal of material melting, a heating wire with a higher power is required to provide more heat, which increases energy consumption and transfers more temperature to the upper material inlet. , increasing the temperature of the material inlet, causing the material to melt in advance, blocking the inlet or interrupting the material supply

[0005] Furthermore, due to the lack of heating efficiency, the extension of the heating part increases the size of the equipment and reduces the flexibility of the nozzle movement, which in turn affects the printing efficiency and printing accuracy

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