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Cleaning method and line for nozzle of FDM-3D printer

An FDM-3D, printer technology, applied in cleaning methods and utensils, chemical instruments and methods, 3D object support structures, etc., can solve problems such as dripping, easy clogging of printing nozzles, blackening and discoloration, etc., to prevent nozzle clogging, good print effect

Active Publication Date: 2014-12-10
SHENZHEN ESUN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the most common problem that people encounter when using 3D printers is that after a long time of printing, the inside of the printing nozzle of the FDM-3D printer is easily blocked, which causes great inconvenience to the printing work and seriously affects the work efficiency
In addition, after the printer prints for a long time, a small part of the molten material will stick to the outer surface of the nozzle, forming nozzle deposits, which will turn black and discolored when heated for a long time, and some of them will drip and drip on the surface of the printed object , which affects the printing effect; on the other hand, the coke is coated on the outer surface of the nozzle, and the accumulation of material in the nozzle and the adhesion between the melt and the nozzle will also affect the printing effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] At 260-280°C, the material polyethylene is extruded on a single-screw extruder with a line diameter (diameter) of 1.75mm as a cleaning line, wherein the softening point of polyethylene is 127°C, and the melt flow rate (2.16 kg) is 1g / 10min, the hardness is 69shoreD, the impact strength is 50kg cm / cm, and the tensile yield strength is 295kg / cm 2 , The tensile breaking strength is 390kg / cm 2 , Tensile elongation at break is 1000%, density is 0.956g / cm 3 .

[0024] The cleaning process when the FDM-3D printer needs to switch between different materials is as follows: the printing material used in the FDM-3D printer is ABS (printing temperature is 230-250°C, in this example 240°C), after printing, the The temperature of the nozzle is maintained at the printing temperature of ABS. After withdrawing the ABS, put in the cleaning line prepared above, and turn forward until the ABS is completely extruded and stop, so as to remove the residue of ABS in the nozzle. Then withdraw...

Embodiment 2

[0026] At 210-230°C, the material polyethylene is extruded on a twin-screw extruder with a line diameter (diameter) of 3mm as a cleaning line, wherein the softening point of polyethylene is 122°C, and the melt flow rate (2.16kg ) is 7g / 10min, hardness is 70shoreD, impact strength is 30kg cm / cm, tensile yield strength is 240kg / cm 2 , The tensile breaking strength is 360kg / cm 2 , Tensile elongation at break is 850%, density is 0.956g / cm 3 .

[0027] The cleaning process after the FDM-3D printer finishes printing is as follows: The printing material used in the FDM-3D printer is PLA (the printing temperature is 190-210°C, and the printing temperature in this example is 210°C). The temperature of the nozzle is maintained at the printing temperature of PLA, the PLA is withdrawn, and the cleaning line prepared above is put in, and it is rotated forward until the PLA is completely extruded and then stopped, so as to remove the residue of PLA in the nozzle.

Embodiment 3

[0029]When the FDM-3D printer needs to change the printing lines of different colors, the cleaning process is as follows: the printing material used in the FDM-3D printer is red PLA (printing temperature is 190 ° C), after the printing is completed, the nozzle temperature is maintained at The printing temperature of PLA, withdraw PLA, put into the cleaning line that embodiment 2 makes, forward rotation stops after red PLA is extruded completely, thereby removes the residue of red PLA in the nozzle. Then withdraw the cleaning line, increase the temperature of the nozzle, put in green ABS printing material (printing temperature 230°C), and then squeeze out the remaining cleaning line for subsequent printing. After the nozzle is cleaned by the cleaning line, the material of the latter color will not be affected by the material of the former color during the printing process, and the printing effect is better.

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PUM

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Abstract

The invention discloses a cleaning method for a nozzle of an FDM-3D printer. The method includes the following step that at the temperature of 170 DEG C-300 DEG C, a cleaning line is extruded on the FDM-3D printer so that residual materials in the nozzle of the FDM-3D printer can be extruded, wherein the diameter of the cleaning line is matched with that of the nozzle, the cleaning line is made of polyethylene or modified polyethylene, the softening point of the material of the cleaning line is 100 DEG C-200 DEG C, the melt flow rate is 0.5 g-15 g / 10 min, and the hardness is larger than or equal to 60 shore D. The nozzle of the FDM-3D printer can be prevented from being blocked.

Description

technical field [0001] The invention relates to the field of FDM-3D printers, in particular to a method for cleaning nozzles of an FDM-3D printer and cleaning lines. Background technique [0002] 3D printing (3D printing), which is a kind of rapid prototyping technology, is based on digital model files, using laser beams, hot-melt nozzles, etc. to print metal powder, plastic lines, etc. layer by layer. object technology. 3D printing pioneered the concept of "additive manufacturing" net shape, with the help of three-digit digital model design, using various three-dimensional printing technologies such as material jetting, sintering, welding, etc., to achieve layer-by-layer deposition or bonding of raw materials, and finally the way to obtain shaped objects. At present, in the 3D printing technology, there are mainly four technologies: stereolithography (SLA), layer overlay manufacturing (LOM), selective laser sintering (SLS) and fused deposition (FDM, Fused Deposition Modeli...

Claims

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Application Information

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IPC IPC(8): B08B7/00B29C67/00
CPCB08B9/027B29C67/00B08B7/00B29C64/35
Inventor 杨义浒方润玲何文滚肖湘莲
Owner SHENZHEN ESUN IND
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