CN109514861A - A kind of self-centering continuous fiber composite material 3D printing extruder head - Google Patents
A kind of self-centering continuous fiber composite material 3D printing extruder head Download PDFInfo
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- CN109514861A CN109514861A CN201910024536.XA CN201910024536A CN109514861A CN 109514861 A CN109514861 A CN 109514861A CN 201910024536 A CN201910024536 A CN 201910024536A CN 109514861 A CN109514861 A CN 109514861A
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- extruder head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/209—Heads; Nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/321—Feeding
- B29C64/336—Feeding of two or more materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/523—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement in the die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
- B29C70/526—Pultrusion dies, e.g. dies with moving or rotating parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
Abstract
The invention belongs to 3D printing technique fields, and it discloses a kind of self-centering continuous fiber composite material 3D printing extruder heads, including extruder head ontology；Material guide channel, softening channel, melt channel are successively arranged in the extruder head ontology；It further include the feeding mechanism for conveying basis material to material guide channel, the minimum diameter in softening channel and the diameter of basis material are adapted, and the melt channel is the channel for keeping fluid forward around the axle center spiral of melt channel.The extruder head can make fiber filament enter the center of basis material.
Description
Technical field
The present invention relates to 3D printing technique field, specially a kind of self-centering continuous fiber composite material 3D printing is squeezed out
Head.
Background technique
Continuous fiber composite material has that high-modulus, high intensity, that high tenacity, thermal stability is good, designability is strong etc. is excellent
Characteristic has important application prospect in fields such as aerospace, defence and military and civilian industries.Traditional continuous fiber is multiple
Condensation material moulding process has hot-forming, RTM molding, Wrapping formed, pultrusion, laminated into type etc., to promotion continuous fiber
The development and application of composite material plays the role of highly important, but all there are some disadvantages all the time and can not overcome, such as
Most of moulding process needs dedicated mold, and forming process is complicated and processing cost is high, is difficult to realize the fast of complex structural member
Speed manufacture, greatly limits the application range of continuous fiber composite material.The fast development of 3D printing technique makes complexity in recent years
Fibrous composite product is quickly produced and is possibly realized, easy to operate possessed by 3D printing technique, that speed is fast, precision is high etc. is excellent
Point is filled with new vitality to continuous fiber composite material application.
The method manufacture entity component that continuous fiber composite material 3D printing technique is successively stacked using composite material, work
It is that the electronic 3-D model of physical entity is separated into a series of two-dimentional synusia as principle, utilizes accurate nozzle or laser heat
The composite material of cladding is superimposed by continuous physical layer and is solidified under Digital Control driving according to synusia information by source,
Increase material successively to generate 3D solid product.Compared to traditional continuous fiber composite material moulding process, 3D printing technique
Process is simple, and processing cost is low, and stock utilization is high, reduces the manufacturing cost of composite element, while can realize complexity
The integral forming of component provides an effective technology way for the quick manufacture of low cost of continuous fiber composite material component
Diameter.
However, being still in infancy at present for the research of continuous fiber reinforced composite materials 3D printing technique, still
It has the disadvantage in that
One, the wellability of extrusion molding process fiber filament and thermoplastic matrix materials is inadequate, leads to basis material after solidification
It is insufficient with filametntary degrees of fusion, so that traditional handicraft level is still not achieved in the mechanical property of final molding component.
Two, fiber filament is in melting substrate fluid center always during being unable to ensure composite material extrusion moulding, influences
The accurate controllability of fiber filament wiring path, while making interlaminar strength after stacking molding poor, component performance cannot be fully met
Actual use demand.
Three, in existing continuous fiber composite material 3D printing forming process, outside is relied on mostly to the shearing of continuous fiber
Shear is realized by the movement of control shear to realize and jumps and print continuous fiber when completing in print procedure
It cuts, not only motion structure is huge, but also needs to cooperate complicated motion control arithmetic, strongly limits continuous fiber composite wood
Expect the shaping speed of 3D printing.
CN201610683124.3 discloses a kind of continuous fiber reinforced thermoplastic resin based composites 3D printing method
And print head, the print head melt chamber and extruder head inside are equipped with spiral ring gear, the two rotates in the opposite direction, fibre bundle and heat
Plastic resin is stirred after melt chamber is melted and is blended by the spiral ring gear of bidirectional rotation, so that fiber is densely twined by flattening shape
Coiling column, and resin is uniformly distributed in each fiber orientation.This approach enhance filametntary compactness and wellability,
But overall structure is excessively complicated, is difficult to realize, and fiber can not be made to enter the center of basis material, jumps in print procedure
Or it also cannot achieve after the completion of printing to filametntary automatic shearing.
Summary of the invention
The purpose of the present invention is to provide a kind of self-centering continuous fiber composite material 3D printing extruder head, the extruder head energy
Fiber filament is enough set to enter the center of basis material.
To achieve the above object, the invention provides the following technical scheme: a kind of self-centering continuous fiber composite material 3D is beaten
Print extruder head, including extruder head ontology；Material guide channel, softening channel, melt channel are successively arranged in the extruder head ontology；
It further include the feeding mechanism for conveying basis material to material guide channel, the minimum diameter and basis material in the softening channel
Diameter be adapted, the melt channel is the channel for keeping fluid forward around the axle center spiral of melt channel.
It should be understood that
One, softening the effect in channel is for softening basis material；The channel can have heating source, also can use
The waste heat of melting zone softens basis material, does not do excessive limitation to this present invention；
Two, the effect of melt channel is for melting basis material；In general there should be heat source.
Three, material guide channel, softening channel, melt channel layout angle do not do excessive limitation, preferably from top to bottom successively
Arrangement, but it is also feasible for having certain gradient in practical applications.
Four, the minimum diameter for softening channel should be equal or slightly larger than the diameter of basis material.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, the inner wall of the melt channel is equipped with
Internal screw thread.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, the end of the melt channel is fixed
There is shearing tool.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, material guide channel, softening channel constitute one
A continuous channel design in surface；The channel design includes a guide slope surface, and the guide slope surface is in tilted layout.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, the channel design further includes and leads
The opposite inner wall arranged vertically in charge bank face.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, under the channel design is thick on one
Thin channel design.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, perpendicular to channel design length direction
Section is calabash shaped.
The advantage of the material guide channel of upper coarse and lower fine channel design or more preferably calabash shaped is: can allow fiber filament
It is mobile in the taper end of material guide channel, make basis material mobile in the butt end of material guide channel, the two is not interfere with each other and each self-operating is steady
It is fixed.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, the vertical arrangement opposite with guide slope surface
Inner wall, the axle center of melt channel it is coaxially arranged.
Coaxial arrangement is advantageous in that: can be offseted to one side after basis material enters melt channel, be driven fiber filament
It more can readily enter the center of basis material.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, the end of the melt channel is equipped with
Nozzle, the shearing tool are fixed on the end of the nozzle.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, position is equipped in the extruder head ontology
Heating wire on the outside of melt channel；It is equipped in the extruder head ontology and is located at melt channel and softens the outer of channel intersection
The heat insulating mattress of side.
In above-mentioned self-centering continuous fiber composite material 3D printing extruder head, the melt channel diameter by upper and
Under be gradually reduced.
Compared with prior art, the beneficial effects of the present invention are:
1, soften channel and melt channel cooperation, basis material and fiber filament merge in softening channel, basis material water
Flat extrusion fiber silk merges fiber filament and basis material tentatively, and basis material will drive fiber filament and move downward and melt in spiral
Circulate the self-centering center for making fiber filament enter basis material in road；It is being squeezed out by the king bolt structure realization of melt channel
Suction is whirled up when thermoplastic matrix fluid, traction fiber filament realizes self-centering feeding, so that fiber during extrusion molding
Silk is always in melting substrate fluid center, it is ensured that Coating combination face is basis material of the same race, enhancing Coating combination effect when molding
It answers, greatly improves the interlaminar strength of shaped component.
2, material guide channel is devised.Basis material is fed into the company in softening channel and vertical axis direction along material guide channel
Continuous fiber intersects at a certain angle, along the basis material of slope surface feeding continuous fiber is generated in the vertical direction one it is downward
Thrust, so that extruder head only relies on a set of substrate feeding mechanism and basis material feeding synchronous with continuous fiber can be realized, greatly
Reduce the complexity and weight of extruder head greatly, also generation one is biggish in the horizontal direction while basis material is fed squeezes
Pressure is conducive to molten state basis material and penetrates into inside fiber filament, improves the wellability to continuous fiber.
3, the shear that structure is simple, reliable for operation is devised.Shearing tool is fixed at nozzle exit, when
Completion is jumped or printed in print procedure when needing to cut fiber filament, the movement of substrate feeding mechanism stopping at this time, basis material
Larger locking power is kept to fiber filament, system only passes through the displacement of control extruder head, the quick of continuous fiber can be realized
It cuts.Entire shear greatly alleviates the overall weight of extruder head, improves without increasing additional driving, executing agency
The shaping speed of composite material.
4, as a preferred embodiment, in order to improve filametntary centering effect, the diameter of spiral melt channel by upper and
Under be gradually reduced, melting basis material flow velocity become larger, fiber filament is located in rapidly fluid in the case where melting basis material cyclonic action
Center.
Detailed description of the invention
Fig. 1 is the cross-sectional view of the embodiment of the present invention 1；
Fig. 2 is the top view of the extruder head ontology of the embodiment of the present invention 1；
Fig. 3 is the cross-sectional view of the extruder head ontology of the embodiment of the present invention 1；
Fig. 4 is the schematic diagram of another preferred embodiment of the embodiment of the present invention 1.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
Please refer to Fig. 1-3, a kind of self-centering continuous fiber composite material 3D printing extruder head, including extruder head ontology 1；Institute
Material guide channel 2, softening channel 3, melt channel 4 are successively arranged in the extruder head ontology 1 stated；It further include for conveying basis material
To the feeding mechanism 5 of material guide channel 2, the minimum diameter in softening channel 3 and the diameter of basis material A are adapted A, described
Melt channel 4 be channel for keeping fluid forward around the axle center spiral of melt channel 4.
During the work time, basis material A and fiber filament B synchronize be sent in material guide channel 2, basis material A is by sending
Expect the power transmission of mechanism 5, and fiber filament B drives movement by basis material A, in material guide channel 2, basis material A is general
The fiber filament B that gets along well is contacted, but does not repel basis material A and fiber filament B contact in practical application, only if fiber filament B
The case where winding is easier with basis material A contact.Work of the basis material A in the position of softening 3 minimum diameter of channel
Fiber filament B is entered in the basis material A of softening with lower meeting extrusion fiber silk B, it is advantageous to, softening channel 3 should omit
Greater than the diameter of basis material A.Then basis material A and fiber filament B, which is entered in melt channel 4, melts and around its basis material
A Pivot Point Center is carried out from screw.Last fiber filament B can enter center and the output of basis material A.
In the present embodiment, for keeping fluid preferred around the forward channel of the axle center spiral of melt channel 4 are as follows: described is molten
The inner wall for circulating road 4 is equipped with internal screw thread.
As the further preferred of the present embodiment, the end of the melt channel 4 is connected through a screw thread fixed nozzle 6,
6 end of nozzle is fixed with shearing tool 7.
Shearing tool 7 is fixed at 6 exit of nozzle, completes to need to cut when jumping or printing in print procedure
When fiber filament B, 5 stopping of substrate feeding mechanism movement, basis material A keeps larger locking power to the one end fiber filament B at this time,
Moulding section product 13 is tightly fixed the fiber filament B other end after solidifying and is cemented on print platform 14, the both ends fiber filament B
It is completely fixed constraint, system only passes through the displacement of control extruder head ontology 1, shearing tool 7 can be realized to continuous fiber
Quick shearing.Entire shear greatly alleviates the entirety weight of extruder head without increasing additional driving, executing agency
Amount, improves the shaping speed of composite material.
In the present embodiment, material guide channel 2, softening channel 3 constitute a continuous channel design of continuous surface；Described
Channel design includes a guide slope surface 8, and the guide slope surface 8 is in tilted layout.The advantages of guide slope surface 8 is in tilted layout exists
In, can by basis material A tilt imported into softening channel 3 in, such basis material A can by one for fiber filament B more
Big lateral thrust makes fiber filament B is preparatory to be embedded into basis material A.
Preferably, the channel design further includes the inner wall 9 vertically arranged opposite with guide slope surface 8.Vertical arrangement
Inner wall 9 be for vertical importing fiber filament B to material guide channel 2 and softening channel 3 in, can sufficiently bear basis material
The lateral thrust of A.
Preferably, the channel design is a upper coarse and lower fine channel design, perpendicular to channel design length direction
Section is calabash shaped.
The advantage of the material guide channel 2 of upper coarse and lower fine channel design or more preferably calabash shaped is: can allow fiber
Silk is mobile in the taper end of material guide channel 2, makes basis material mobile in the butt end of material guide channel 2, the two does not interfere with each other and respectively transports
Row is stablized.
In the present embodiment, the inner wall vertically arranged opposite with guide slope surface 8, the axle center of melt channel 4 are coaxially arranged.
Coaxial arrangement is advantageous in that: can be offseted to one side after basis material enters melt channel 4, be driven fiber filament
It more can readily enter the center of basis material.
Preferably, the heating wire 12 for being located at 4 outside of melt channel is equipped in the extruder head ontology 1；The extrusion
The heat insulating mattress 10 for being located at melt channel 4 with the outside for softening 3 intersection of channel is equipped in head ontology 1.
In the present embodiment, softening channel 3 and be not provided with individual heating source, it can by the heat radiation of melt channel 4
To carry out appropriate heating to softening channel 3；The size of heat insulating mattress 10 is determined according to the property of practical substrate.Melt channel 4
Inside it is additionally provided with temperature sensor 11.
As the further optimization of the present embodiment, with reference to Fig. 4, the diameter of the melt channel 4 is from top to bottom gradually
Reduce, so that melting basis material flow velocity is accelerated, fiber filament is located in rapidly fluid in the case where melting basis material cyclonic action
Center.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (10)
1. a kind of self-centering continuous fiber composite material 3D printing extruder head, including extruder head ontology；The extruder head ontology
Inside it is successively arranged material guide channel, softening channel, melt channel；It is characterized in that, further including for conveying basis material to guide
The feeding mechanism in channel, the minimum diameter in softening channel and the diameter of basis material are adapted, the melt channel
For the channel for keeping fluid forward around the axle center spiral of melt channel.
2. self-centering continuous fiber composite material 3D printing extruder head according to claim 1, which is characterized in that described
The inner wall of melt channel is equipped with internal screw thread.
3. self-centering continuous fiber composite material 3D printing extruder head according to claim 1, which is characterized in that described
The end of melt channel is fixed with shearing tool.
4. self-centering continuous fiber composite material 3D printing extruder head according to claim 1, which is characterized in that guide is logical
Road, softening channel constitute a continuous channel design in surface；The channel design includes a guide slope surface, and described leads
Charge bank face is in tilted layout.
5. self-centering continuous fiber composite material 3D printing extruder head according to claim 4, which is characterized in that described
Channel design further includes the inner wall vertically arranged opposite with guide slope surface.
6. self-centering continuous fiber composite material 3D printing extruder head according to claim 4, which is characterized in that described
Channel design is a upper coarse and lower fine channel design；Section perpendicular to channel design length direction is calabash shaped.
7. self-centering continuous fiber composite material 3D printing extruder head according to claim 4, which is characterized in that with guide
The opposite inner wall arranged vertically of slope surface, the axle center of melt channel are coaxially arranged.
8. self-centering continuous fiber composite material 3D printing extruder head according to claim 6, which is characterized in that described
The end of melt channel is equipped with nozzle, and the shearing tool is fixed on the end of the nozzle.
9. -8 any self-centering continuous fiber composite material 3D printing extruder head according to claim 1, which is characterized in that
The heating wire being located on the outside of melt channel is equipped in the extruder head ontology；It is equipped in the extruder head ontology and is located at melting
The heat insulating mattress in channel and the outside of softening channel intersection.
10. -8 any self-centering continuous fiber composite material 3D printing extruder head, feature exist according to claim 1
In the melt channel diameter is from top to bottom gradually reduced.
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| CN201910024536.XA CN109514861B (en) | 2019-01-10 | 2019-01-10 | A kind of self-centering continuous fiber composite material 3D printing extruder head |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112172147A (en) * | 2020-08-28 | 2021-01-05 | 中科院广州电子技术有限公司 | 3D printing head of continuous fiber reinforced material and using method |
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| CN106738891A (en) * | 2017-03-01 | 2017-05-31 | 机械科学研究总院先进制造技术研究中心 | A kind of continuous fiber composite material increasing material manufacturing method of interlaminar improvement |
| WO2018203768A1 (en) * | 2017-05-03 | 2018-11-08 | Автономная некоммерческая образовательная организация высшего образования "Сколковский институт науки и технологий" | Method for additive manufacturing of products made of composite materials reinforced with continuous fibres |
| CN107415220A (en) * | 2017-06-16 | 2017-12-01 | 桂林市新众科技有限公司 | 3D printing ejecting device |
| CN107139471A (en) * | 2017-07-08 | 2017-09-08 | 芜湖智享三维打印服务有限公司 | A kind of pre-fusion 3D printer shower nozzle |
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| CN112172147A (en) * | 2020-08-28 | 2021-01-05 | 中科院广州电子技术有限公司 | 3D printing head of continuous fiber reinforced material and using method |
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