Screw extrusion device of fusion deposition modeling technology-based 3D printer

Abstract

The invention relates to a screw extrusion device of a fusion deposition modeling (for short: FDM) technology-based 3D printer, and belongs to the field of 3D printing technologies. The screw extrusion device comprises a speed reduction mechanism, a feeding mechanism, a hot melt spray head, a motor and a supporting plate, wherein the speed reduction mechanism conveys a thermofuse into the hot melt spray head through the feeding mechanism under the driving of the motor, the hot melt spray head heats the thermofuse so as to enable the thermofuse to be fused, the fused thermofuse is extruded from the hot melt spray head through a screw in the speed reduction mechanism which is retarded by a worm and a worm gear. The screw extrusion device is compact in design, accurate to control, large in extrusion pressure, and applicable to thermofuses with different sizes and precisions, the precision of the fusion deposition modeling technology-based 3D printer can be effectively improved, the speed of the fusion deposition modeling technology-based 3D printer can be effectively increased, and the discharge unevenness and plugging phenomena can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of three-dimensional printing and molding, and in particular relates to a screw extrusion device of a 3D printer using fusion lamination molding technology (abbreviation: FDM). Background technique [0002] FDM fused lamination molding 3D printing technology uses filamentous hot-melt materials as raw materials, and uses electric heating to heat the filaments to the melting temperature. Under the control of the computer, according to the cross-sectional information, the molten material is coated with Cover it on the workbench and form a cross-section of the workpiece after cooling. The hot-melt nozzle moves up to a layer height, and then coats the next layer of cross-section, so that the three-dimensional workpiece is formed layer by layer. [0003] Extrusion devices of existing FDM fused lamination molding 3D printers all use a stepper motor output shaft to install a wire feed wheel to directly extrude and feed the ho...

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Problems solved by technology

[0005] 2. Due to the uneven size of the hot-melt wire material, the feeding speed and downward pressure of the hot-melt wire material are uneven, resulting in uneven wire output speed from the nozzle, poor reliability, out-of-step, and even nozzle blockage, which makes the nozzle The dimensional accuracy of hot-melt wire is very high

[0006] 3. Due to the indirect application of extrusion pressure, it is difficult to accurately control the filament output of the nozzle, which limits the running actions during the printing process, such as stopping the filament and moving, accelerating accumulation, etc., which affects the accuracy and speed of the 3D printer and reduces the printing speed. Yield of

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