CN105235220A - Gas-aid extrusion head of fused deposition modeling (FDM) 3D printer - Google Patents
Gas-aid extrusion head of fused deposition modeling (FDM) 3D printer Download PDFInfo
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- CN105235220A CN105235220A CN201510777419.2A CN201510777419A CN105235220A CN 105235220 A CN105235220 A CN 105235220A CN 201510777419 A CN201510777419 A CN 201510777419A CN 105235220 A CN105235220 A CN 105235220A
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Abstract
The invention provides a gas-aid extrusion head of a fused deposition modeling (FDM) 3D printer. The gas-aid extrusion head comprises two parts. According to one part, a conical sprayer nozzle is arranged on one side of the extrusion head, and an annular air chamber and an extruded material passage are arranged on the other side. According to the other part, a cylindrical passage is arranged on one side of a material receiving pipe, and a cylindrical cavity with an inner thread is arranged on the other side of the material receiving pipe. The material receiving pipe is provided with a cylindrical passage and a conical passage with larger diameters and a cylindrical passage with a smaller diameter in the feeding direction. An outer thread is arranged on the outer side of the outer wall of the annular air chamber, an air inlet is formed in one side of the annular air chamber and communicated with an air inlet of the material receiving pipe, a small gap exists between the extruded material passage in the middle and the material receiving pipe, and an outer thread is arranged on the outer wall of the material receiving pipe. The gas-aid extrusion head of the FDM 3D printer can control the diameter of the materials extruded from the sprayer nozzle to be unchanged and prevent the diameter of the extruded materials from being increased after extrusion. Therefore the outer wall of the extruded materials can be smooth, the surface roughness of the extruded materials is reduced, the phenomenon that raw materials are left in the extruded material passage is avoided, and the extrusion process is smoother.
Description
Technical field
The present invention relates to FDM3D printing technique field, particularly a kind of Air-Assisted Extrusion of Polymer head of 3D printer.
Background technology
3D printing technique belongs to increasing material manufacturing technology, and FDM3D printing three-dimensional modeling data is converted into stl file form, then by the program in 3D printer by data processing, by thread hot-melting material heat fused, melted material is extruded by extruder head thin channel, and 3D printer controls the motion of shower nozzle, and the filament of the rule extruded from extruder head is deposited on work top, then filament material is through piling up cooling curing from level to level, and last threedimensional model is just printed as entity.3D prints the direct manufacture developing gradually and be used for product in recent years, has been used in many industries such as industrial design, automobile making, medical treatment, aviation, electronics.
Melted material is extruded into filament shape by extruder head by 3D printer, finally piles up shaping, and the product quality of printing is directly relevant with the filament extruded, and the structure extruding form and extruder head of filament has very large relation.Filament diameter after extruding from extruder head in current 3D printer can swell, and the filament surfaces after extruding is rough, makes shaping product surface coarse, directly can not use, and will could obtain desirable product through the processing process in later stage.Do like this and can take time and effort, increase workload and cost, can not job requirement be met.The speed that melted material is extruded from extruder head is comparatively slow, consuming time longer.Want the difficulty that can increase printing during the precision component that stamp with the size is tiny, structure is more complicated, sometimes even can block jet hole, affect its precision printed and quality, can not get desirable surface quality and geomery.
Summary of the invention
The object of the invention is the above-mentioned technical problem solving prior art existence, the filament diameter controlling to extrude remains unchanged, improve the rate of extrusion of material, avoid extruding retained material in passage, even block extrusion, reduce the surface roughness of filament, make the filament surfaces more smooth pieces extruded, thus improve speed and the precision quality of the product printed.
In order to head it off, the technical scheme that the present invention takes is:
A kind of Air-Assisted Extrusion of Polymer head, described Air-Assisted Extrusion of Polymer head comprises two parts, and the extruder head side of a part is provided with conical nozzle, and opposite side has air chamber and the extruded stock passage of annular; The material receiving tube side of another part is provided with cylindrical channel, and opposite side is the female cylindrical cavity of band.Described material receiving tube has by feedstock direction the cylindrical channel that larger-diameter cylindrical channel and tapered channel and diameter are less, there is external screw thread in the outside of the outer wall of described annular air chamber, side is provided with air inlet, be communicated with the air inlet of material receiving tube, between the round platform of middle extruded stock passage and material receiving tube, have less gap.
The external screw thread of the material receiving tube of described another part and the screw-internal thread fit of heater, the band screw thread of extruder head of conical nozzle and the screw-internal thread fit of the part extruder head of material receiving tube.
The extruder head of described band conical nozzle overlaps with the center of gravity of the part extruder head of material receiving tube, and this two-part extruder head will screw closely.
Described air inlet is arranged on the centre position of the extruder head outer wall of air chamber, and the center line that upper and lower two-part extruder head assembles rear air inlet is wanted centering to overlap.
Strict guarantee is wanted in round platform in the middle of the air chamber of the conical extruder head of described band and the gap between material receiving tube, and the center line of upper and lower two passwaies wants centering to overlap.
In extruder head of the present invention, columniform passage presses feedstock direction, wire rod is in larger diameter channels after melting, by the tapered channel of centre, melted material is squeezed into less diameter, it is tightr that material extrudes, under the pressure effect of the gas then in air chamber, material is extruded, wherein passes into gas in air chamber and the surface along the cylindrical material extruded is flowed out, extruded stock last pile up forming part layer by layer.Can control like this extruded stock extrude from nozzle after filament diameter constant, prevent from extruded stock from extruding rear diameter to swell, one deck gas rete is defined between extruded stock and the die surface of extruder head, the outer wall contributing to extruded stock becomes smooth, reduce its surface roughness, avoid the situation of material extrusion passage retained material, make extrusion more smooth and easy.
Accompanying drawing explanation
Fig. 1 is the generalized section of the Air-Assisted Extrusion of Polymer head of a kind of FDM3D printer of the present invention.
Fig. 2 is the package assembly generalized section that the present invention is applied in a kind of extruding device of FDM3D printer.
Fig. 3 is the structural blast figure that the present invention is applied in a kind of extruding device of FDM3D printer.
Mark in figure: 1, conical nozzle, 2, material extrusion passage, 3, head, 4, air chamber pipe, 5, air inlet, 7, air chamber, 8, round platform, 9, gap, 10, material receiving tube, 12, splicing passage, 13, heater, 14, passage, 16, air inlet pipe, 17, sensor, 18, heating tube, 19, screw thread, 20, material extrusion passage.
detailed description of the invention:
Below with reference to the accompanying drawings the present invention is further detailed: the Air-Assisted Extrusion of Polymer head that the invention provides a kind of FDM3D printer, described Air-Assisted Extrusion of Polymer head comprises two parts, extruder head 3 side of a part is provided with conical nozzle 1, and opposite side has air chamber 7 and the extruded stock passage 20 of annular; The side of the material receiving tube 10 of another part is provided with cylindrical channel 12, and opposite side is the female cylindrical cavity 6 of band.This two parts extruder head screws closely by screw thread 6, and this two-part threaded engagement processing, engagement closely, ensures that thread pitch is air tight.Described material receiving tube 10 has by feedstock direction the cylindrical channel 2 that larger-diameter cylindrical channel 12 and tapered channel 11 and diameter are less.The side in the outside of the outer wall of described annular air chamber 7 is provided with air inlet 15, is connected with the air inlet 5 of material receiving tube, and two-part extruder head assembles channel center's axis centering of rear air inlet 15 and air inlet 5.Extruder head 3 and material receiving tube 10 are assembled closely, and have less gap 9 between the round platform 8 of middle extruded stock passage and material receiving tube 10, gap 9 ensures at 0.1mm.The outer wall of described material receiving tube 10 has external screw thread 16, and material receiving tube 10 is fixed by screw thread 16 with heater 13.
Described columniform passage presses feedstock direction, wire rod melting in larger diameter channels 12, by the tapered channel 11 of centre, melted material is squeezed into less diameter, melted material is through cylindrical channel 20, the gas of compression enters air chamber 7 by air inlet pipe 16, after gas is stable in air chamber, then under the pressure effect of gas, material is extruded from passage 2, cylindrical surface along extruded stock flows out by the gas wherein passed in air chamber, one deck gas rete is defined between extruded stock and the die surface of extruder head, the cylindrical material finally extruded is under the squeezing action of the surface gas extruded, the filament diameter extruded is suitable with the diameter of extrusion, extruded stock piles up forming part layer by layer.
Claims (5)
1. an Air-Assisted Extrusion of Polymer head for FDM3D printer, described Air-Assisted Extrusion of Polymer head comprises two parts, and extruder head (3) side of a part is provided with conical nozzle (1), and opposite side has air chamber (7) and the extruded stock passage (2) of annular; The side of the material receiving tube (10) of another part is provided with cylindrical channel (12), and opposite side is the female cylindrical cavity of band (6); The cylindrical channel (2) that described material receiving tube (10) has the less cylindrical channel (20) of larger-diameter cylindrical channel (12) and tapered channel (11) and diameter by feedstock direction and finally extrudes, the outside of the outer wall of described annular air chamber (7) is provided with external screw thread, side is provided with air inlet (15), be connected with the air inlet (5) of material receiving tube, have less gap (9) between the round platform (8) of middle extruded stock passage and material receiving tube (10), the outer wall of described material receiving tube (10) has external screw thread (16).
2. the Air-Assisted Extrusion of Polymer head of a kind of FDM3D printer according to claim 1, is characterized in that: the side of the extruder head of a described part is provided with the air chamber of annular (7) and extruded stock passage (2).
3. the Air-Assisted Extrusion of Polymer head of a kind of FDM3D printer according to claim 2, is characterized in that: the cylindrical channel (2) that described material receiving tube has the less cylindrical channel (20) of larger-diameter cylindrical channel (12) and tapered channel (11) and diameter by feedstock direction and finally extrudes.
4. the Air-Assisted Extrusion of Polymer head of a kind of FDM3D printer according to claim 2, it is characterized in that: described material receiving tube is arranged with inverted v-shaped by the tapered channel (11) between the larger-diameter cylindrical channel of feedstock direction (12) and the less cylindrical channel (20) of diameter, the length of larger-diameter cylindrical channel (20) and the less cylindrical channel (2) of diameter is setting.
5. the Air-Assisted Extrusion of Polymer head of a kind of FDM3D printer according to claim 3, is characterized in that: have less gap (9) between the round platform (8) of described middle extruded stock passage and material receiving tube (10), and the distance of gap (9) is setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510777419.2A CN105235220A (en) | 2015-11-16 | 2015-11-16 | Gas-aid extrusion head of fused deposition modeling (FDM) 3D printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510777419.2A CN105235220A (en) | 2015-11-16 | 2015-11-16 | Gas-aid extrusion head of fused deposition modeling (FDM) 3D printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105235220A true CN105235220A (en) | 2016-01-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510777419.2A Pending CN105235220A (en) | 2015-11-16 | 2015-11-16 | Gas-aid extrusion head of fused deposition modeling (FDM) 3D printer |
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| CN (1) | CN105235220A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110337358A (en) * | 2017-02-28 | 2019-10-15 | 科思创德国股份有限公司 | For having print head, the method and system of the 3D printing of variable rate of discharge |
| CN112917900A (en) * | 2021-01-21 | 2021-06-08 | 四川大学 | Air pressure formula fused deposition type 3D prints shower nozzle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825752A (en) * | 2012-08-16 | 2012-12-19 | 南昌大学 | Gas-assistant extrusion molding device |
| CN103895226A (en) * | 2014-03-24 | 2014-07-02 | 浙江大学 | 3D-printing-based machining method of three-dimensional micro-fluidic chip and printing device |
| CN104742368A (en) * | 2015-03-06 | 2015-07-01 | 英华达（上海）科技有限公司 | Printing head, three-dimensional forming equipment and printing method |
| CN105034389A (en) * | 2015-09-06 | 2015-11-11 | 成都思维智造科技有限公司 | Spray head structure of large 3D printer |
-
2015
- 2015-11-16 CN CN201510777419.2A patent/CN105235220A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825752A (en) * | 2012-08-16 | 2012-12-19 | 南昌大学 | Gas-assistant extrusion molding device |
| CN103895226A (en) * | 2014-03-24 | 2014-07-02 | 浙江大学 | 3D-printing-based machining method of three-dimensional micro-fluidic chip and printing device |
| CN104742368A (en) * | 2015-03-06 | 2015-07-01 | 英华达（上海）科技有限公司 | Printing head, three-dimensional forming equipment and printing method |
| CN105034389A (en) * | 2015-09-06 | 2015-11-11 | 成都思维智造科技有限公司 | Spray head structure of large 3D printer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110337358A (en) * | 2017-02-28 | 2019-10-15 | 科思创德国股份有限公司 | For having print head, the method and system of the 3D printing of variable rate of discharge |
| CN112917900A (en) * | 2021-01-21 | 2021-06-08 | 四川大学 | Air pressure formula fused deposition type 3D prints shower nozzle |
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Application publication date: 20160113 |