CN114248437B - 3D printing method for continuous fiber woven body reinforced fiber composite material - Google Patents
3D printing method for continuous fiber woven body reinforced fiber composite material Download PDFInfo
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- CN114248437B CN114248437B CN202111473787.XA CN202111473787A CN114248437B CN 114248437 B CN114248437 B CN 114248437B CN 202111473787 A CN202111473787 A CN 202111473787A CN 114248437 B CN114248437 B CN 114248437B
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- 239000000835 fiber Substances 0.000 title claims abstract description 282
- 238000010146 3D printing Methods 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000002131 composite material Substances 0.000 title claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 83
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 42
- 230000008569 process Effects 0.000 claims abstract description 26
- 239000011159 matrix material Substances 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 13
- 238000009941 weaving Methods 0.000 claims abstract description 12
- 230000007246 mechanism Effects 0.000 claims description 63
- 229920005989 resin Polymers 0.000 claims description 54
- 239000011347 resin Substances 0.000 claims description 54
- 239000000758 substrate Substances 0.000 claims description 47
- 238000005520 cutting process Methods 0.000 claims description 45
- 238000009954 braiding Methods 0.000 claims description 32
- 238000007639 printing Methods 0.000 claims description 30
- 229920006231 aramid fiber Polymers 0.000 claims description 25
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 23
- 239000004917 carbon fiber Substances 0.000 claims description 23
- 238000001125 extrusion Methods 0.000 claims description 22
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 19
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims description 19
- 229920002530 polyetherether ketone Polymers 0.000 claims description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 11
- 238000004132 cross linking Methods 0.000 claims description 11
- 238000005096 rolling process Methods 0.000 claims description 11
- 229920002748 Basalt fiber Polymers 0.000 claims description 10
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 239000003381 stabilizer Substances 0.000 claims description 5
- 239000004760 aramid Substances 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
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- 238000012805 post-processing Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 9
- 239000011229 interlayer Substances 0.000 abstract description 8
- 239000003733 fiber-reinforced composite Substances 0.000 abstract description 4
- 238000007781 pre-processing Methods 0.000 abstract description 4
- 230000002787 reinforcement Effects 0.000 abstract description 3
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Classifications
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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
- B29C64/314—Preparation
-
- 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
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
-
- 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
-
- 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
- B29C64/295—Heating elements
-
- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
-
- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
-
- 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
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/12—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of short length, e.g. in the form of a mat
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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
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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
-
- 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
- B33Y10/00—Processes of additive manufacturing
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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
- B33Y40/10—Pre-treatment
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Composite Materials (AREA)
- Textile Engineering (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention provides a 3D printing method for a continuous fiber woven body reinforced fiber composite material, and belongs to the field of 3D printing material molding. According to the invention, the short fiber reinforced thermoplastic resin matrix composite material is used as a matrix, the continuous fiber woven body is used as a supporting framework, the matrix material is injected into the supporting framework through heating in a hot melting way, and the Z-direction reinforcement is assisted by needling, so that the novel 3D printing and forming of the fiber reinforced composite material are realized. The technology effectively increases the fiber content of the continuous fiber composite material, combines the weaving and needling processes of the textile industry with the 3D printing technology, strengthens the binding force of the continuous fiber woven body with thermoplastic resin by preprocessing the continuous fiber woven body, and simultaneously, the Z-direction needling makes the fiber have the reinforcing effect on the interlayer binding force, so that the strength of the composite material structure can be obviously improved. The invention effectively solves the problems of low fiber content, low structural strength, poor interlayer bonding performance and the like of the fiber 3D printing material.
Description
Technical Field
The invention relates to the field of 3D printing and forming, in particular to a 3D printing method for a continuous fiber woven body reinforced fiber composite material.
Background
The 3D printing technology of the fiber reinforced resin matrix composite material provides possibility for low-cost manufacture of the thermoplastic composite material, and has huge application prospects in the fields of aerospace, new energy automobiles and the like. At present, only a short fiber printing process is mature in a fiber composite material 3D printing technology, but the short fiber has very limited improvement on the mechanical property of a test piece, and the continuous fiber reinforced thermoplastic resin matrix composite material 3D printing technology is expected to realize low-cost rapid manufacturing and forming of a high-performance composite material, but the popularization and application of the high-performance composite material are limited by the following problems.
At present, the fiber content of the continuous fiber composite material formed by 3D printing is not high, so that the bearing capacity of the composite material is low. After the fiber and the resin are heated by a nozzle, the fiber and the resin are extruded and simply stacked and formed on a platform, the bonding force of the product in the Z direction is mainly determined by the bonding force between resin materials, and the fiber does not play a role in strengthening the bonding between Z-direction layers, so that the mechanical property still depends on the resin matrix material with lower strength. The thermoplastic substrate and the continuous fiber are combined to form a lower binding force, so that the reinforcing effect of the fiber is not achieved.
Therefore, how to change the current situations of low fiber content, low structural strength and poor interlayer bonding performance of the existing composite material becomes a problem to be solved by the technicians in the field.
Disclosure of Invention
Aiming at the existing problems, the invention refers to the idea of paving reinforcing steel bars first and then pouring cement in the building field, integrates the high fiber content of short fiber wires and the high structural strength of long fiber wires, combines the weaving and needling processes in the textile industry with the 3D printing technology, and provides a new path for solving the problems of low fiber content, low structural strength, poor interlayer bonding performance and the like of the fiber 3D printing material.
The invention provides a 3D printing method of a continuous fiber woven body reinforced fiber composite material, which comprises the following steps: the 3D printing method comprises the following steps:
(1) Preparation of continuous fiber braid: pretreating continuous fibers, preparing the continuous fibers into a woven structure through a weaving process, and then impregnating the continuous fibers with molten thermoplastic resin to prepare a continuous fiber woven body;
(2) Preparation of reinforced thermoplastic resin substrate: preparing a short fiber reinforced thermoplastic resin substrate raw material into a felt, carrying out needling treatment on the felt, furling and rolling the felt into a strip shape, heating the strip-shaped felt for 6-30 minutes at 230-300 ℃, carrying out twisting extrusion cooling under the pressure of 6-25MPa by using extrusion equipment, and cutting into short fiber reinforced thermoplastic resin substrates with proper widths; the short fiber reinforced thermoplastic resin base material comprises 50-60% of short fibers according to the mass ratio; 30-50% of thermoplastic resin fibers; 0-3% of compatilizer; 0-2% of auxiliary agent;
(3) Importing a 3D printing model;
(4) Heating, melting and uniformly stirring the short fiber reinforced thermoplastic resin substrate obtained in the step (2) by using a continuous fiber braid reinforced fiber composite material 3D printing device, then sending the short fiber reinforced thermoplastic resin substrate into a first 3D printing nozzle, heating the continuous fiber braid obtained in the step (1), and then sending the continuous fiber braid into a second 3D printing nozzle;
(5) The printer starts to work, the second 3D printing nozzle outputs the heated continuous fiber woven body, the first 3D printing nozzle ejects and injects the base material in a molten state into the output continuous fiber woven body, before the base material is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the base material and the woven body, short fibers in the base body are hooked and connected with the fiber woven body to form a cross-linking structural material;
(6) Cutting the fiber by a cutting mechanism and moving a nozzle to the starting point of the next continuous path after printing is completed according to the operation mode of the step (5), and repeating the operation according to the step (5) until printing is completed to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
Further, the continuous fibers in the step (1) are one or any combination of carbon fibers, aramid fibers, fibrilia and basalt fibers, and the thermoplastic resin is one or any combination of PP, PEEK, PA, PA66, ABS or PLA.
Further, the continuous fiber woven body structure in the step (1) is one or any combination of plain weave, twill weave, satin weave or three-dimensional weave structure.
Further, the pretreatment in the step (1) is one or any combination of sizing treatment, electrochemical treatment, plasma treatment, chemical treatment or oxidation treatment.
Further, the short fibers in the step (2) are one or any combination of carbon fibers, aramid fibers, fibrilia and basalt fibers, and the thermoplastic resin is one or any combination of PP, PEEK, PA, PA66, ABS or PLA; the compatilizer is one or any combination of a silane coupling agent and maleic anhydride; the auxiliary agent is one or any mixture of a lubricant, a dispersing agent or a thermal oxygen stabilizer.
Further, the 3D printing device for the fiber composite material reinforced by the continuous fiber woven body in the step (4) comprises a first 3D printing nozzle, a second 3D printing nozzle, a needling mechanism, a feeding mechanism, a guide sleeve, a heating mechanism, a stirring mechanism, a cutting mechanism and a workbench, which are vertically arranged, wherein the second 3D printing nozzle and the needling mechanism are respectively positioned at the left side and the right side of the first 3D printing nozzle, the second 3D printing nozzle can realize adjustable included angle with the first 3D printing nozzle in a rotating manner, a base material and a woven body respectively enter the printing nozzle after being processed by the cutting mechanism, the guide sleeve, the feeding mechanism and the heating mechanism, the base material needs to be uniformly stirred before entering the nozzle, the base material and the woven body are needled in the Z direction by the needling mechanism after being processed by the nozzle, short fibers in a base material are hooked and are formed with the fiber woven body to form an cross-linking material product on the workbench.
Further, the Z-direction needling depth in the step (5) is more than one half of the thickness of the fiber woven body and less than the thickness of the woven body.
Further, the 3D printing method further includes the steps of:
(1) Sizing the carbon fiber, preparing the carbon fiber into a plain weave structure through a weaving process, and then impregnating the plain weave structure with molten PLA resin to prepare a continuous fiber woven body;
(2) According to the mass ratio: mixing 50% of short carbon fibers, 45% of PLA resin fibers, 3% of silane coupling agent and 2% of lubricant to prepare a felt, carrying out needling treatment on the felt, furling and rolling the felt into strips, heating the strip felt at 230-250 ℃ for 6-10 minutes, carrying out twisting extrusion by extrusion equipment under the pressure of 6-10MPa, cooling, and cutting into short carbon fiber reinforced PLA resin base materials with proper widths;
(3) Importing a 3D printing model;
(4) Heating, melting and stirring the short carbon fiber reinforced PLA resin substrate obtained in the step 2), then sending the substrate to a first 3D printing nozzle, and heating the continuous fiber woven body obtained in the step 1) and then sending the substrate to a second 3D printing nozzle;
(5) The printer starts to work, the second 3D printing nozzle outputs the heated continuous fiber woven body, the first 3D printing nozzle ejects and injects the base material in a molten state into the output continuous fiber woven body, before the base material is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the base material and the woven body, the needling thickness is 2/3 of the thickness of the woven body, and short fibers in the base body are hooked and connected with the fiber woven body to form a cross-linking structural material;
(6) Cutting off the fiber by a cutting mechanism and moving a nozzle to the starting point of the next continuous path after printing is finished in the operation mode of the step (5), and repeating the operation according to the step (5) until printing is finished to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
Further, the 3D printing method further includes the steps of:
(1) Carrying out electrochemical treatment on the aramid fiber, preparing the aramid fiber into a twill weave structure through a weaving process, and then impregnating the aramid fiber with molten PEEK resin to prepare a continuous fiber weave body;
(2) According to the mass ratio: mixing 55% of short aramid fiber, 40% of PEEK resin fiber, 3% of silane coupling agent and 2% of dispersing agent to prepare a felt, carrying out needling treatment on the felt, furling and rolling the felt into a strip shape, heating the strip-shaped felt at 250-270 ℃ for 8-10 minutes, carrying out twisting extrusion by extrusion equipment under the pressure of 9-13MPa, cooling, and cutting into short aramid fiber reinforced PEEK resin base materials with proper widths;
(3) Importing a 3D printing model;
(4) Heating, melting and stirring the short aramid fiber reinforced PEEK resin substrate obtained in the step (2), then sending the substrate into a first 3D printing nozzle, and heating the continuous fiber woven body obtained in the step (1) and then sending the substrate into a second 3D printing nozzle;
(5) The printer starts to work, the second 3D printing nozzle outputs the continuous fiber braiding body, the first 3D printing nozzle ejects and injects the base material in a molten state into the output continuous fiber braiding body, before the base material is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the base material and the braiding body, the needling thickness is 3/4 of the thickness of the braiding body, and short fibers in the base body are hooked and connected with the fiber braiding body to form a cross-linking structural material;
(6) Cutting off the fiber by a cutting mechanism and moving a nozzle to the starting point of the next continuous path after printing is finished in the operation mode of the step (5), and repeating the operation according to the step (5) until printing is finished to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
Further, the 3D printing method further includes the steps of:
(1) Carrying out electrochemical treatment on the continuous fibers, preparing the continuous fibers into a three-dimensional braided structure through a braiding process, and then impregnating the continuous fibers with molten PP resin to prepare a continuous fiber braided body; the continuous fibers are mixed fibers of fibrilia and basalt fibers;
(2) According to the mass ratio: mixing 58% of fibrilia and basalt fiber mixed fibers, 37% of PP resin fibers, 3% of maleic anhydride and 2% of thermal oxygen stabilizer to prepare a felt, carrying out needling treatment on the felt, furling and rolling the felt into strips, heating the strip felt at 230-240 ℃ for 7-9 minutes, carrying out twisting extrusion by extrusion equipment under the pressure of 8-11MPa, cooling, and cutting into short mixed fiber reinforced PP resin base materials with proper widths;
(3) Importing a 3D printing model;
(4) Heating, melting and stirring a short mixed fiber reinforced thermoplastic resin substrate, then sending the short mixed fiber reinforced thermoplastic resin substrate into a first 3D printing nozzle, heating a continuous fiber woven body, and then sending the continuous fiber woven body into a second 3D printing nozzle;
(5) The printer starts to work, the second 3D printing nozzle outputs the continuous fiber braiding body, the first 3D printing nozzle ejects and injects the base material in a molten state into the output continuous fiber braiding body, before the base material is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the base material and the braiding body, the needling thickness is 4/5 of the thickness of the braiding body, and short fibers in the base body are hooked and connected with the fiber braiding body to form a cross-linking structural material;
(6) After printing is completed on a continuous printing path, cutting off fibers by a cutting mechanism, moving a spray head to the starting point of the next continuous path, and repeating the operation according to the step (5) until printing is completed, so as to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) The invention is mainly a set of forming process system of 3D reinforced structure suitable for different material systems, can prepare any fiber and thermoplastic resin 3D printing composite material, breaks the bottleneck of single material of the 3D printing material, and can realize 3D printing of various material composites;
(2) According to the invention, the reinforced fiber is designed into the braid material with the microstructure, and the matrix resin contains a large amount of short fibers, so that the fibers can be uniformly and fully filled into the resin by matching with the needling process, and the fiber content in the obtained 3D printing material is far higher than that of the 3D printing material disclosed in the prior art. The specific process is as follows: the short fiber reinforced thermoplastic resin matrix composite is used as a matrix, the continuous fiber woven body is used as a supporting framework, the matrix material is injected into the supporting framework through heating in a hot melting way, and the Z-direction reinforcement is assisted by needling, so that the short fiber is hooked and connected with the woven body, and the novel 3D printing and forming of the fiber reinforced composite are realized. The technology effectively increases the fiber content of the continuous fiber composite material, strengthens the binding force between the continuous fiber woven body and thermoplastic resin by preprocessing the continuous fiber woven body, simultaneously enables the short fibers to be hooked with the reinforced woven body through Z-direction needling, plays a role in reinforcing the interlayer binding force, and can remarkably improve the strength of the composite material structure. The invention effectively solves the problems of low fiber content, low structural strength, poor interlayer bonding performance and the like of the fiber 3D printing material.
(3) The invention is characterized in that: the fiber content of the continuous fiber composite material is effectively increased, the weaving and needling process in the textile industry is combined with the 3D printing technology, the bonding force between the continuous fiber woven body and thermoplastic resin is enhanced by preprocessing the continuous fiber woven body, then the short fibers are firstly hooked through Z-direction needling, and then the crosslinked structural material is formed by the continuous fiber woven body, so that the bonding force between the fibers and the layers is also obviously enhanced, and the strength of the composite material structure can be obviously improved; meanwhile, the invention can be applied to 3D printing buildings. In addition, the fiber braiding body structure of the invention can be one or any combination of plain weave, twill, satin or three-dimensional braiding structures, compared with the prior art, the surface area of the braiding body is larger, and the contact area with a matrix material is larger, so that the mechanical strength improvement effect on the 3D printing composite material is larger.
(4) The invention relates to a brand new 3D printing process, which comprises the steps of combining two 3D printing spray heads with a needling mechanism, and developing a novel 3D printing process of a fiber reinforced composite material with a microstructure reinforced and needling reinforced combination; the process has the characteristics of low cost and high efficiency, and the printed product has good structural strength and rigidity and has good development prospect.
The invention will be further described with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic view of a continuous fiber braid reinforced fiber composite 3D printing device;
FIG. 2 is a woven body of a planar structure, FIG. 2a is a woven body of a plain weave structure, and FIG. 2b is a woven body of a twill weave structure;
FIG. 3 is a three-dimensional weave of three-dimensional structures; FIG. 3a is a three-dimensional winding structure, and FIG. 3b is a warp and weft structure;
fig. 4 is a flow chart of a continuous fiber reinforced composite 3D printing process model construction.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, but the content of the present invention is not limited to the following implementation examples.
Fig. 1 and fig. 4 respectively show a continuous fiber woven body reinforced fiber composite material 3D printing device and a processing process flow chart:
1. The device comprises a substrate placement area, a first cutting mechanism, a first guide sleeve, a first feeding mechanism, a first heating mechanism, a 6 stirring mechanism, a first 3D printing spray head, a 8 needling mechanism, a 9 product placement area, a 10 workbench, a second 3D printing spray head, a 12 heating mechanism, a 13 second cutting mechanism, a 14 second feeding mechanism, a 15 second guide sleeve and a 16 braiding body placement area, wherein the first cutting mechanism is arranged on the substrate placement area; the first 3D prints shower nozzle 7 and sets up perpendicularly, its top sets gradually rabbling mechanism 6, a heating mechanism 5, a feeding mechanism 4, a uide bushing 3, a cutting mechanism 5 and substrate place the district 1, place the short fiber reinforced thermoplastic resin substrate of processing in the substrate of cutting mechanism 2 top place the district 1, needling mechanism 8 is located the right side of a 3D and prints shower nozzle 7, the second 3D prints shower nozzle 11 and sets up in the left side of a 3D and print shower nozzle 7, it realizes through rotatory mode that the contained angle between the shower nozzle 7 is adjustable with a 3D, its top sets gradually No. two heating mechanism 12, no. two feeding mechanism 14, no. two uide bushing 15, no. two cutting mechanism 13 and the braiding body place the district 16, place the continuous fiber braiding body of processing in the braiding body place the district 16 of cutting mechanism 13 top.
The processing technology of fig. 4 is as follows: the short fiber reinforced thermoplastic resin base material and the continuous fiber braiding body enter a first 3D printing nozzle and a second 3D printing nozzle respectively through processes of cutting, guiding, heating (stirring), feeding and the like, the base material and the braiding body are subjected to Z-direction needling by a needling mechanism after being processed by the nozzles, and short fibers in the base material are hooked and connected with the fiber braiding body to form a cross-linked structural material product on a workbench.
Example 1
(1) Sizing the carbon fiber, preparing the carbon fiber into a plain weave structure through a weaving process, and then impregnating the plain weave structure with molten PLA resin to prepare a continuous fiber woven body;
(2) According to the mass ratio: mixing 50% of short carbon fibers, 45% of PLA resin fibers, 3% of silane coupling agent and 2% of lubricant to prepare a felt, carrying out needling treatment on the felt, furling and rolling the felt into strips, heating the strip felt at 230-250 ℃ for 6-10 minutes, carrying out twisting extrusion by extrusion equipment under the pressure of 6-10MPa, cooling, and cutting into short carbon fiber reinforced PLA resin base materials with proper widths;
(3) Importing a 3D printing model;
(4) Heating, melting and stirring the short carbon fiber reinforced PLA resin substrate obtained in the step (2), then sending the substrate to a first 3D printing nozzle, and sending the continuous fiber woven body obtained in the step (1) to a second 3D printing nozzle after heating;
(5) The printer starts to work, the second 3D printing nozzle outputs the heated continuous fiber woven body, the first 3D printing nozzle ejects and injects the substrate in a molten state into the output continuous fiber woven body, before the substrate is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the substrate and the woven body, and the needling thickness is 2/3 of the thickness of the woven body; hooking short fibers in a matrix and forming a cross-linking structural material with the fiber braid;
(6) Cutting off the fiber by a cutting mechanism and moving a nozzle to the starting point of the next continuous path after printing is finished in the operation mode of the step (5), and repeating the operation according to the step (5) until printing is finished to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
Example 2
(1) Carrying out electrochemical treatment on the aramid fiber, preparing the aramid fiber into a twill weave structure through a weaving process, and then impregnating the aramid fiber with molten PEEK resin to prepare a continuous fiber weave body;
(2) According to the mass ratio: mixing 55% of short aramid fiber, 40% of PEEK resin fiber, 3% of silane coupling agent and 2% of dispersing agent to prepare a felt, carrying out needling treatment on the felt, furling and rolling the felt into a strip shape, heating the strip-shaped felt at 250-270 ℃ for 8-10 minutes, carrying out twisting extrusion by extrusion equipment under the pressure of 9-13MPa, cooling, and cutting into short aramid fiber reinforced PEEK resin base materials with proper widths;
(3) Importing a 3D printing model;
(4) Heating, melting and stirring the short aramid fiber reinforced PEEK resin substrate obtained in the step (2), then sending the substrate into a first 3D printing nozzle, and heating the continuous fiber woven body obtained in the step (1) and then sending the substrate into a second 3D printing nozzle;
(5) The printer starts to work, the second 3D printing nozzle outputs the heated continuous fiber woven body, the first 3D printing nozzle ejects and injects the substrate in a molten state into the output continuous fiber woven body, before the substrate is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the substrate and the woven body, the needling thickness is 3/4 of the thickness of the woven body, and short fibers in the substrate are hooked and connected with the fiber woven body to form a cross-linking structural material;
(6) Cutting off the fiber by a cutting mechanism and moving a nozzle to the starting point of the next continuous path after printing is finished in the operation mode of the step (5), and repeating the operation according to the step (5) until printing is finished to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
Example 3
(1) Carrying out electrochemical treatment on the continuous fibers, preparing the continuous fibers into a three-dimensional braiding structure through a braiding process, and then impregnating the continuous fibers with molten PP resin to prepare a continuous fiber braiding body; the continuous fibers are mixed fibers of fibrilia and basalt fibers;
(2) According to the mass ratio: mixing raw materials of 58% of short mixed fibers (mixed fibers of fibrilia and basalt fibers), 37% of PP resin fibers, 3% of maleic anhydride and 2% of thermal oxygen stabilizer to prepare a felt, carrying out needling treatment on the felt, furling and rolling the felt into strips, heating the strip felt for 7-9 minutes at 230-240 ℃, carrying out twisting extrusion at 8-11MPa by extrusion equipment, cooling, and cutting into short mixed fiber reinforced PP resin base materials with proper widths;
(3) Importing a 3D printing model;
(4) Heating, melting and stirring a short mixed fiber reinforced thermoplastic resin substrate, then sending the short mixed fiber reinforced thermoplastic resin substrate into a first 3D printing nozzle, heating a continuous fiber woven body, and then sending the continuous fiber woven body into a second 3D printing nozzle;
(5) The printer starts to work, the second 3D printing nozzle outputs the heated continuous fiber woven body, the first 3D printing nozzle ejects and injects the substrate in a molten state into the output continuous fiber woven body, before the substrate is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the substrate and the woven body, the needling thickness is 4/5 of the thickness of the woven body, and short fibers in the substrate are hooked and connected with the fiber woven body to form a cross-linking structural material;
(6) After printing is completed on a continuous printing path, cutting off fibers by a cutting mechanism, moving a spray head to the starting point of the next continuous path, and repeating the operation according to the step (5) until printing is completed, so as to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
To sum up: the reinforced fiber obtained by the invention is a braid material with microstructure reinforcement, and the matrix resin contains a large amount of short fibers, so that the fibers can be uniformly and fully filled into the resin by matching with a needling process, and the fiber content in the obtained 3D printing material is far more than that of the 3D printing material disclosed by the prior art; the binding force between the continuous fiber braid and the thermoplastic resin is enhanced by preprocessing the continuous fiber braid, and meanwhile, the short fibers are hooked with the reinforced braid by Z-direction needling, so that the interlayer binding force is enhanced, and the strength of the composite material structure can be obviously improved. The invention enables the fiber 3D printing material to have the following advantages simultaneously through the synergistic effect of the components of the matrix material and the braiding body, the process design, the heating treatment of the matrix material and the braiding body, the design of two spray heads, the Z-direction needling and other aspects: the fiber content is high, the surface area of the braiding body is large, the contact area with the matrix material is also large, the structural strength is high, and the interlayer bonding performance is strong; the method has the advantages of low cost, high efficiency and the like.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. A3D printing method of a continuous fiber woven body reinforced fiber composite material is characterized by comprising the following steps of: the 3D printing method comprises the following steps:
(1) Preparation of continuous fiber braid: pretreating continuous fibers, preparing the continuous fibers into a woven structure through a weaving process, and then impregnating the continuous fibers with molten thermoplastic resin to prepare a continuous fiber woven body;
(2) Preparation of reinforced thermoplastic resin substrate: preparing a short fiber reinforced thermoplastic resin substrate raw material into a felt, carrying out needling treatment on the felt, furling and rolling the felt into a strip shape, heating the strip-shaped felt for 6-30 minutes at 230-300 ℃, carrying out twisting extrusion cooling under the pressure of 6-25MPa by using extrusion equipment, and cutting into short fiber reinforced thermoplastic resin substrates with proper widths; the short fiber reinforced thermoplastic resin base material comprises 50-60% of short fibers according to the mass ratio; 30-50% of thermoplastic resin fibers; 0-3% of compatilizer; 0-2% of auxiliary agent;
(3) Importing a 3D printing model;
(4) Heating, melting and uniformly stirring the short fiber reinforced thermoplastic resin substrate obtained in the step (2) by using a continuous fiber braid reinforced fiber composite material 3D printing device, then sending the short fiber reinforced thermoplastic resin substrate into a first 3D printing nozzle, heating the continuous fiber braid obtained in the step (1), and then sending the continuous fiber braid into a second 3D printing nozzle;
(5) The method comprises the steps that a continuous fiber woven body reinforced fiber composite material 3D printing device starts to work, a second 3D printing nozzle outputs a heated continuous fiber woven body, a first 3D printing nozzle ejects and injects a short fiber reinforced thermoplastic resin base material in a molten state into the output continuous fiber woven body, before the short fiber reinforced thermoplastic resin base material is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the short fiber reinforced thermoplastic resin base material and the continuous fiber woven body, and short fibers in the short fiber reinforced thermoplastic resin base material are hooked and connected with the continuous fiber woven body to form a cross-linking structural material;
(6) Cutting off the continuous fiber woven body through a cutting mechanism after printing is completed in the operation mode of the step (5), and moving the first 3D printing nozzle and the second 3D printing nozzle to the starting point of the next continuous path, and repeating the operation according to the step (5) until printing is completed to obtain a required product;
(7) Post-processing the processed product to obtain a finished product;
The 3D printing device for the fiber composite material reinforced by the continuous fiber braiding body comprises a first 3D printing spray head, a second 3D printing spray head, a needling mechanism, a feeding mechanism which are vertically arranged, a guide sleeve, a heating mechanism, a stirring mechanism, a cutting mechanism and a workbench, wherein the second 3D printing spray head and the needling mechanism are respectively positioned at the left side and the right side of the first 3D printing spray head, the second 3D printing spray head can realize adjustable included angle with the first 3D printing spray head in a rotating manner, a short fiber reinforced thermoplastic resin base material and a continuous fiber braiding body are respectively processed by the cutting mechanism, the guide sleeve, the feeding mechanism and the heating mechanism and then enter the first 3D printing spray head and the second 3D printing spray head, uniform stirring treatment is needed before the short fiber reinforced thermoplastic resin base material enters the first 3D spray head, the needling mechanism is adopted to carry out Z-direction needling on the short fiber reinforced thermoplastic resin base material and the continuous fiber braiding body after the first 3D spray head is processed, and the short fiber reinforced thermoplastic resin base material and the continuous fiber braiding body are formed into a cross-structure material product on the workbench;
the Z-direction needling depth in the step (5) is more than one half of the thickness of the continuous fiber woven body and less than the thickness of the continuous fiber woven body.
2. The method for 3D printing of a continuous fiber woven body reinforced fiber composite material according to claim 1, wherein the method comprises the following steps: the continuous fibers in the step (1) are one or any combination of carbon fibers, aramid fibers, fibrilia and basalt fibers, and the thermoplastic resin is one or any combination of PP, PEEK, PA, PA66, ABS or PLA.
3. A method for 3D printing of a continuous fiber woven reinforced fiber composite material according to claim 1 or 2, characterized by: the continuous fiber woven body structure in the step (1) is one or any combination of plain weave, twill weave, satin weave or three-dimensional weaving structure.
4. A method of 3D printing a continuous fiber woven body reinforced fiber composite material according to claim 3, wherein: the pretreatment in the step (1) is one or any combination of sizing treatment, electrochemical treatment, plasma treatment, chemical treatment or oxidation treatment.
5. The method for 3D printing of a continuous fiber woven body reinforced fiber composite material according to claim 4, wherein the method comprises the following steps: the short fibers in the step (2) are one or any combination of carbon fibers, aramid fibers, fibrilia and basalt fibers, and the thermoplastic resin is one or any combination of PP, PEEK, PA, PA66, ABS or PLA; the compatilizer is one or any combination of a silane coupling agent and maleic anhydride; the auxiliary agent is one or any mixture of a lubricant, a dispersing agent or a thermal oxygen stabilizer.
6. The method for 3D printing of a continuous fiber woven body reinforced fiber composite material according to claim 1, wherein the method comprises the following steps: the 3D printing method comprises the following steps:
(1) Sizing the carbon fiber, preparing the carbon fiber into a plain weave structure through a weaving process, and then impregnating the plain weave structure with molten PLA resin to prepare a continuous fiber woven body;
(2) According to the mass ratio: mixing 50% of short carbon fibers, 45% of PLA resin fibers, 3% of silane coupling agent and 2% of lubricant to prepare a felt, carrying out needling treatment on the felt, furling and rolling the felt into strips, heating the strip felt at 230-250 ℃ for 6-10 minutes, carrying out twisting extrusion by extrusion equipment under the pressure of 6-10MPa, cooling, and cutting into short carbon fiber reinforced PLA resin base materials with proper widths;
(3) Importing a 3D printing model;
(4) Heating, melting and stirring the short carbon fiber reinforced PLA resin substrate obtained in the step 2), then sending the substrate to a first 3D printing nozzle, and sending the continuous fiber woven body obtained in the step (1) to a second 3D printing nozzle after heating;
(5) The 3D printing device of the fiber composite material reinforced by the continuous fiber woven body starts to work, the second 3D printing nozzle outputs the heated continuous fiber woven body, meanwhile, the first 3D printing nozzle ejects and injects the short carbon fiber reinforced PLA resin base material in a molten state into the output continuous fiber woven body, before the short carbon fiber reinforced PLA resin base material is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the short carbon fiber reinforced PLA resin base material and the continuous fiber woven body, the needling thickness is 2/3 of the thickness of the continuous fiber woven body, and the short carbon fiber reinforced PLA resin base material is hooked and connected with the continuous fiber woven body to form an crosslinked structural material;
(6) Cutting off fibers by a cutting mechanism after printing a continuous printing path according to the operation mode of the step (5), and moving a first 3D printing nozzle and a second 3D printing nozzle to the starting point of the next continuous path, and repeating the operation according to the step (5) until printing is completed to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
7. The method for 3D printing of a continuous fiber woven body reinforced fiber composite material according to claim 1, wherein the method comprises the following steps: the 3D printing method comprises the following steps:
(1) Carrying out electrochemical treatment on the aramid fiber, preparing the aramid fiber into a twill weave structure through a weaving process, and then impregnating the aramid fiber with molten PEEK resin to prepare a continuous fiber weave body;
(2) According to the mass ratio: mixing 55% of short aramid fiber, 40% of PEEK resin fiber, 3% of silane coupling agent and 2% of dispersing agent to prepare a felt, carrying out needling treatment on the felt, furling and rolling the felt into a strip shape, heating the strip-shaped felt at 250-270 ℃ for 8-10 minutes, carrying out twisting extrusion by extrusion equipment under the pressure of 9-13MPa, cooling, and cutting into short aramid fiber reinforced PEEK resin base materials with proper widths;
(3) Importing a 3D printing model;
(4) Heating, melting and stirring the short aramid fiber reinforced PEEK resin substrate obtained in the step (2), then sending the substrate into a first 3D printing nozzle, and heating the continuous fiber woven body obtained in the step (1) and then sending the substrate into a second 3D printing nozzle;
(5) The 3D printing device of the fiber composite material reinforced by the continuous fiber woven body starts to work, the second 3D printing nozzle outputs the continuous fiber woven body, meanwhile, the first 3D printing nozzle ejects and injects the short aramid fiber reinforced PEEK resin base material in a molten state into the output continuous fiber woven body, before the short aramid fiber reinforced PEEK resin base material is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the short aramid fiber reinforced PEEK resin base material and the continuous fiber woven body, the needling thickness is 3/4 of the thickness of the continuous fiber woven body, and short fibers in a base body are hooked and connected with the continuous fiber woven body to form a cross-linking structural material;
(6) Cutting off fibers by a cutting mechanism after printing a continuous printing path according to the operation mode of the step (5), and moving a first 3D printing nozzle and a second 3D printing nozzle to the starting point of the next continuous path, and repeating the operation according to the step (5) until printing is completed to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
8. The method for 3D printing of a continuous fiber woven body reinforced fiber composite material according to claim 1, wherein the method comprises the following steps: the 3D printing method comprises the following steps:
(1) Carrying out electrochemical treatment on the continuous fibers, preparing the continuous fibers into a three-dimensional braided structure through a braiding process, and then impregnating the continuous fibers with molten PP resin to prepare a continuous fiber braided body; the continuous fibers are mixed fibers of fibrilia and basalt fibers;
(2) According to the mass ratio: mixing 58% of fibrilia and basalt fiber mixed fibers, 37% of PP resin fibers, 3% of maleic anhydride and 2% of thermal oxygen stabilizer to prepare a felt, carrying out needling treatment on the felt, furling and rolling the felt into strips, heating the strip felt at 230-240 ℃ for 7-9 minutes, carrying out twisting extrusion by extrusion equipment under the pressure of 8-11MPa, cooling, and cutting into short mixed fiber reinforced PP resin base materials with proper widths;
(3) Importing a 3D printing model;
(4) Heating, melting and stirring the short mixed fiber reinforced PP resin base material, then sending the short mixed fiber reinforced PP resin base material into a first 3D printing nozzle, heating the continuous fiber woven body, and then sending the continuous fiber woven body into a second 3D printing nozzle;
(5) The 3D printing device of the fiber composite material reinforced by the continuous fiber woven body starts to work, the second 3D printing nozzle outputs the continuous fiber woven body, meanwhile, the first 3D printing nozzle ejects and injects the short mixed fiber reinforced PP resin base material in a molten state into the output continuous fiber woven body, before the short mixed fiber reinforced PP resin base material is not solidified, a needling mechanism is adopted to carry out Z-direction needling on the short mixed fiber reinforced PP resin base material and the continuous fiber woven body, the needling thickness is 4/5 of the thickness of the continuous fiber woven body, and short fibers in a matrix are hooked and form a cross-linking structural material with the continuous fiber woven body;
(6) After printing is completed on a continuous printing path, cutting off fibers by a cutting mechanism, moving a first 3D printing nozzle and a second 3D printing nozzle to the starting point of the next continuous path, and repeating the operation according to the step (5) until printing is completed, so as to obtain a required product;
(7) And (5) carrying out post-treatment on the processed product to obtain a finished product.
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