阅读说明：本技术 连续纤维增强复合材料3d打印机剪切机构及使用方法 (Continuous fiber reinforced composite material 3D printer shearing mechanism and using method ) 是由 张秋菊 陈威 曹汉 宁萌 李可 顾杰斐 于 2019-11-07 设计创作，主要内容包括：本发明涉及一种连续纤维增强复合材料3D打印机剪切机构及使用方法,剪切机构包括剪切刀、驱动机构、喷头机构和耦合控制系统,所述喷头机构包括散热风扇和喷头主体,所述散热风扇包括风扇叶和风扇支架,于喷头主体上间隔设置若干片散热片和两条对称的送料管路,所述送料管路包括喉管、连接件、加热环、喷嘴和快速接头,剪切刀的一侧连接驱动机构,另一侧伸入喷头主体上的安装槽内。本发明通过安装剪切机构,增强了连续纤维类复合材料3D打印的灵活性,降低了纤维连续性对3D打印路径规划的限制,实现含纤维零件的功能化设计和快速化制造,剪切机构及其耦合控制系统的设计有利于提升连续纤维增强热塑性复合材料3D打印成型件的表面质量和力学性能。(The invention relates to a shearing mechanism of a continuous fiber reinforced composite material 3D printer and a using method thereof, wherein the shearing mechanism comprises a shearing knife, a driving mechanism, a spray head mechanism and a coupling control system, the spray head mechanism comprises a cooling fan and a spray head main body, the cooling fan comprises a fan blade and a fan support, a plurality of cooling fins and two symmetrical feeding pipelines are arranged on the spray head main body at intervals, each feeding pipeline comprises a throat pipe, a connecting piece, a heating ring, a nozzle and a quick connector, one side of the shearing knife is connected with the driving mechanism, and the other side of the shearing knife extends into a mounting groove in the spray head main body. According to the invention, by installing the shearing mechanism, the flexibility of 3D printing of the continuous fiber composite material is enhanced, the limitation of fiber continuity on 3D printing path planning is reduced, the functional design and rapid manufacturing of fiber-containing parts are realized, and the design of the shearing mechanism and the coupling control system thereof is beneficial to improving the surface quality and mechanical property of the continuous fiber reinforced thermoplastic composite material 3D printing formed part.)

1. The utility model provides a mechanism is cuted to continuous fibers reinforcing combined material 3D printer which characterized in that: the device comprises a shearing knife (1), a driving mechanism, a spray head mechanism and a coupling control system, wherein the spray head mechanism comprises a radiating fan (2) and a spray head main body (3), the radiating fan (2) comprises a fan blade (201) and a fan support (202), the fan support (202) is in threaded connection with one side surface of the spray head main body (3) through a plurality of fastening screws (302), a plurality of radiating grooves (303) are uniformly formed in the surface of the spray head main body (3) at the joint of the spray head main body (3) and the radiating fan (2), the radiating grooves (303) cut the surface of the spray head main body (3) to form a plurality of radiating fins (301) arranged at intervals, two feeding pipelines are symmetrically arranged on the spray head main body (3), and each feeding pipeline comprises a throat pipe (4), a connecting piece (5), a heating ring (6), a nozzle (7) and a quick joint (8), a quick connector (8) is fixedly connected to the top of the spray head main body (3), a throat (4) is arranged at the bottom of the spray head main body (3), the throat (4) is connected with a heating ring (6) through a connecting piece (5), and a nozzle (7) is arranged below the heating ring (6);

from one side of shower nozzle main part (3) inwards set up mounting groove (304) that run through homonymy pay-off pipeline, in the homonymy of mounting groove (304) sets up shears sword (1), it is L type structure to shear sword (1), and actuating mechanism is connected to one side of shearing sword (1), and the opposite side of shearing sword (1) stretches into in mounting groove (304).

2. The continuous fiber reinforced composite 3D printer shear mechanism of claim 1, wherein: the shearing knife (1) comprises a knife body (101), a plurality of mounting holes (102) are formed in one side, connected with a driving mechanism, of the shearing knife (1), a knife edge is arranged at the end portion of the knife body (101) on one side, extending into the mounting groove (304), of the shearing knife (1), and the knife edge is a forward acute angle knife edge (103) or a reverse acute angle knife edge (104).

3. The continuous fiber reinforced composite 3D printer shear mechanism of claim 1, wherein: the quick connector (8) is connected with the throat pipe (4) through a pipeline penetrating through the spray head main body (3).

4. The continuous fiber reinforced composite 3D printer shear mechanism of claim 1, wherein: the driving mechanism is a cylinder driving mechanism (9), a linear driving mechanism (10), a tooth transmission mechanism (11), a cam driving mechanism (12) or a crank sliding block mechanism (13).

5. The continuous fiber reinforced composite 3D printer shear mechanism of claim 4, wherein: the air cylinder driving mechanism (9) comprises an air cylinder body (901), an air cylinder guide rail (902) and an air cylinder rotor (903), one side of the air cylinder rotor (903) is fixedly connected with the cutter body (101), and the other side of the air cylinder rotor (903) is connected with the air cylinder body (901) through the air cylinder guide rail (902).

6. The continuous fiber reinforced composite 3D printer shear mechanism of claim 4, wherein: the linear driving mechanism (10) comprises a linear driving stator (1001) and a linear driving rotor (1002), one end of the linear driving rotor (1002) is fixedly connected with the cutter body (101), and the other end of the linear driving rotor (1002) is inserted into the linear driving stator (1001).

7. The continuous fiber reinforced composite 3D printer shear mechanism of claim 4, wherein: the tooth transmission mechanism (11) comprises a rack (1101), a gear (1102) and a circumferential rotating motor (1103), one end of the rack (1101) is fixedly connected with the cutter body (101), the gear (1102) is meshed with the rack (1101), a through hole is formed in the center of the gear (1102), and an output shaft of the circumferential rotating motor (1103) penetrates through the through hole to be matched with the gear (1102).

8. The continuous fiber reinforced composite 3D printer shear mechanism of claim 4, wherein: the cam driving mechanism (12) comprises a guide frame (1201), a spring (1202), a cam (1203) and a circumferential rotating motor (1103), wherein the spring (1202) is installed between the spray head main body (3) and the knife body (101) through the guide frame (1201), a through hole is formed in the center of the cam (1203), an output shaft of the circumferential rotating motor (1103) penetrates through the through hole to be matched with the cam (1203), and the side face of the cam (1203) is abutted to the outer edge of the knife body (101).

9. The continuous fiber reinforced composite 3D printer shear mechanism of claim 4, wherein: the crank slider mechanism (13) comprises a primary crank (1301), a secondary crank (1302), a slider (1303), a linear guide rail (1304) and a circumferential rotating motor (1103), one end of the primary crank (1301) is provided with a through hole matched with an output shaft of the circumferential rotating motor (1103), the other end of the primary crank (1301) is hinged to one end of the secondary crank (1302), the other end of the secondary crank (1302) is hinged to the slider (1303), the slider (1303) is arranged in the linear guide rail (1304), and one side face of the slider (1303) is fixedly connected with the cutter body (101).

10. The method for coupling control by using the continuous fiber reinforced composite 3D printer shearing mechanism as claimed in claim 1, wherein:

detecting a current instruction and a next instruction of the G-code file in real time, and setting the printing speed to be a preset cutting printing speed if the next instruction triggers a cutting signal;

triggering a shearing signal to control a shearing mechanism to shear the fiber materials at the blade;

thirdly, controlling a 3D printing nozzle to stably and completely print the cut fibers at a shearing printing speed;

fourthly, controlling the shearing mechanism to move to an initial position, simultaneously controlling the 3D printing mechanism to move to a next printing initial position, and simultaneously controlling the heating module to reach a printing temperature;

fifthly, controlling a wire feeding mechanism to feed continuous fibers to a nozzle;

and sixthly, detecting the G-code file of the 3D printing instruction set and executing the next printing task.

Technical Field

The invention relates to the technical field of 3D printers, in particular to a shearing mechanism of a continuous fiber reinforced composite material 3D printer and a using method of the shearing mechanism.

Background

With the rapid development of the 3D printing technology, the 3D printing technology has been primarily applied in the field of rapid molding of continuous fiber reinforced thermoplastic composite materials. The 3D printing technology of the continuous fiber reinforced thermoplastic composite material has high manufacturing flexibility, and the base material is melted, mixed and layered and stacked through a 3D printer nozzle, so that complex tasks such as rapid forming of complex structural parts, functional design and manufacturing of parts and the like can be realized.

For 3D printing of the continuous fiber reinforced thermoplastic composite material, in the process of layer-by-layer accumulation forming, continuous fibers need to be cut between layers, continuous fibers need to be cut between a plurality of closed printing paths in a single layer, and the continuous fibers need to be cut at some special printing positions, so that the forming defects of material interference, deformation, internal stress, gaps and the like between and in the 3D printing layers are reduced, and the surface quality and the mechanical property of a continuous fiber reinforced thermoplastic composite material 3D printing formed part are ensured. The prior art does not relate to the design of the specific structure, the transmission structure and the power source of the shearing knife of the shearing mechanism, and does not relate to the design of a coupling control system of shearing movement and 3D printing movement.

Disclosure of Invention

The applicant provides a shearing mechanism of a continuous fiber reinforced composite material 3D printer with a reasonable structure and a using method thereof aiming at the defects in the prior art, so that the shearing request of continuous fibers in the 3D printing process of the continuous fiber reinforced thermoplastic composite material is met, the shearing mechanism can also be applied to shearing treatment of materials which are not easy to melt and break in the 3D printing process, and the surface quality and the mechanical property of a 3D printing formed part are ensured.

The technical scheme adopted by the invention is as follows:

a continuous fiber reinforced composite material 3D printer shearing mechanism comprises a shearing knife, a driving mechanism, a nozzle mechanism and a coupling control system, wherein the nozzle mechanism comprises a radiating fan and a nozzle main body, the radiating fan comprises a fan blade and a fan support, the fan support is in threaded connection with one side surface of the nozzle main body through a plurality of fastening screws, a plurality of radiating grooves are uniformly formed in the surface of the nozzle main body at the joint of the nozzle main body and the radiating fan, the radiating grooves cut the surface of the nozzle main body into a plurality of radiating fins arranged at intervals, two feeding pipelines are symmetrically arranged on the nozzle main body, each feeding pipeline comprises a throat pipe, a connecting piece, a heating ring, a nozzle and a quick connector, the quick connector is fixedly connected to the top of the nozzle main body, the throat pipe is arranged at the bottom of the nozzle main body and is connected with the heating ring through the connecting piece, a nozzle is arranged below the heating ring; the self-spraying nozzle comprises a nozzle body, wherein a mounting groove which penetrates through adjacent feeding pipelines is formed in one side of the nozzle body inwards, a shearing knife is arranged on the same side of the mounting groove, the shearing knife is of an L-shaped structure, one side of the shearing knife is connected with a driving mechanism, and the other side of the shearing knife extends into the mounting groove.

The further technical scheme of the invention is as follows:

the shearing knife comprises a knife body, a plurality of mounting holes are formed in the knife body on one side of the shearing knife, which is connected with the driving mechanism, a knife edge is arranged at the end part of the knife body on one side of the shearing knife, which extends into the mounting groove, and the knife edge is a forward acute angle knife edge or a reverse acute angle knife edge;

the quick connector is connected with the throat pipe through a pipeline penetrating through the spray head main body;

the driving mechanism is a cylinder driving mechanism, a linear driving mechanism, a gear transmission mechanism, a cam driving mechanism or a slider-crank mechanism;

the air cylinder driving mechanism comprises an air cylinder body, an air cylinder guide rail and an air cylinder rotor, wherein one side of the air cylinder rotor is fixedly connected with the cutter body, and the other side of the air cylinder rotor is connected with the air cylinder body through the air cylinder guide rail;

the linear driving mechanism comprises a linear driving stator and a linear driving rotor, one end of the linear driving rotor is fixedly connected with the cutter body, and the other end of the linear driving rotor is inserted into the linear driving stator;

the gear transmission mechanism comprises a rack, a gear and a circumferential rotating motor, one end of the rack is fixedly connected with the cutter body, the gear and the rack are meshed with each other, a through hole is formed in the center of the gear, and an output shaft of the circumferential rotating motor penetrates through the through hole to be matched with the gear;

the cam driving mechanism comprises a guide frame, a spring, a cam and a circumferential rotating motor, the spring is installed between the spray head main body and the cutter body through the guide frame, a through hole is formed in the center of the cam, an output shaft of the circumferential rotating motor penetrates through the through hole to be matched with the cam, and the side face of the cam is abutted to the outer edge of the cutter body;

the crank-slider mechanism comprises a primary crank, a secondary crank, a slider, a linear guide rail and a circumferential rotating motor, wherein a through hole matched with an output shaft of the circumferential rotating motor is formed in one end of the primary crank, the other end of the primary crank is hinged with one end of the secondary crank, the other end of the secondary crank is hinged with the slider, the slider is arranged in the linear guide rail, and one side face of the slider is fixedly connected with the cutter body;

the technical scheme adopted by the using method of the invention is as follows:

detecting a current instruction and a next instruction of the G-code file in real time, and setting the printing speed to be a preset cutting printing speed if the next instruction triggers a cutting signal;

triggering a shearing signal to control a shearing mechanism to shear the fiber materials at the blade;

thirdly, controlling a 3D printing nozzle to stably and completely print the cut fibers at a shearing printing speed;

fourthly, controlling the shearing mechanism to move to an initial position, simultaneously controlling the 3D printing mechanism to move to a next printing initial position, and simultaneously controlling the heating module to reach a printing temperature;

fifthly, controlling a wire feeding mechanism to feed continuous fibers to a nozzle;

and sixthly, detecting the G-code file of the 3D printing instruction set and executing the next printing task.

The invention has the following beneficial effects:

the shearing mechanism of the 3D printer for the continuous fiber reinforced thermoplastic composite material is compact and reasonable in structure, the flexibility of 3D printing of the continuous fiber reinforced thermoplastic composite material is enhanced by designing the shearing mechanism of the 3D printer, and the limitation of fiber continuity on the planning of a 3D printing path is reduced; the shearing machine can help to complete various personalized and customized 3D printing path plans, and realize the functional design and rapid manufacturing of continuous fiber reinforced thermoplastic composite material parts; the design of the shearing mechanism and the coupling control system thereof is beneficial to improving the surface quality and the mechanical property of the continuous fiber reinforced thermoplastic composite 3D printing formed part.

Drawings

Fig. 1 is a schematic structural view of a positive acute angle shearing knife of the invention.

Fig. 2 is a schematic structural view of a negative direction acute angle shearing knife of the present invention.

Fig. 3 is a schematic view of a cylinder driving structure of the present invention.

Fig. 4 is a schematic view of an electric linear driving structure according to the present invention.

Fig. 5 is a schematic view of a rack and pinion driving structure of the present invention.

Fig. 6 is a schematic view of the cam driving structure of the present invention.

Fig. 7 is a schematic view of the crank block driving structure of the present invention.

Wherein: 1. a shearing knife; 101. a blade body; 102. mounting holes; 103. a positive acute-angled blade; 104. a reverse acute-angled blade; 2. a heat radiation fan; 201. a fan blade; 202. a fan bracket; 3. a nozzle body; 301. a heat sink; 302. fastening screws; 303. a heat sink; 304. mounting grooves; 4. a throat; 5. a connecting member; 6. a heating ring; 7. a nozzle; 8. a quick coupling; 9. a cylinder driving mechanism; 901. a cylinder block; 902. a cylinder guide rail; 903. a cylinder mover; 10. a linear drive mechanism; 1001. a linear drive stator; 1002. linearly driving the mover; 11. a gear transmission mechanism; 1101. a rack; 1102. a gear; 1103. a circumferential rotating electrical machine; 12. a cam driving mechanism; 1201. a guide frame; 1202. a spring; 1203. a cam; 13. a slider-crank mechanism; 1301. a primary crank; 1302. a secondary crank; 1303. a slider; 1304. a linear guide rail.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in figures 1-7, the invention comprises a shearing knife 1, a driving mechanism, a nozzle mechanism and a coupling control system, the nozzle mechanism comprises a cooling fan 2 and a nozzle body 3, the cooling fan 2 comprises a fan blade 201 and a fan bracket 202, the fan bracket 202 is in threaded connection with one side surface of the nozzle body 3 through a plurality of fastening screws 302, a plurality of cooling grooves 303 are uniformly arranged on the surface of the nozzle body 3 at the joint of the nozzle body 3 and the cooling fan 2, the cooling grooves 303 cut the surface of the nozzle body 3 into a plurality of cooling fins 301 arranged at intervals, two feeding pipelines are symmetrically arranged on the nozzle body 3, each feeding pipeline comprises a throat pipe 4, a connecting piece 5, a heating ring 6, a nozzle 7 and a quick joint 8, the quick joint 8 is fixedly connected to the top of the nozzle body 3, the throat pipe 4 is arranged at the bottom of the nozzle body 3, the throat pipe 4 is connected with the heating ring 6 through the connecting piece 5, a nozzle 7 is arranged below the heating ring 6; set up the mounting groove 304 that runs through adjacent feeding line inwards from one side of shower nozzle main part 3, set up in the homonymy of mounting groove 304 and cut sword 1, cut sword 1 and be L type structure, cut one side connection actuating mechanism of sword 1, cut the opposite side of sword 1 and stretch into in the mounting groove 304.

The shearing knife 1 comprises a knife body 101, a plurality of mounting holes 102 are formed in the knife body 101 on one side of the shearing knife 1 connected with the driving mechanism, and a knife edge is arranged at the end part of the knife body 101 on one side of the shearing knife 1 extending into the mounting groove 304 and is a forward acute knife edge 103 or a reverse acute knife edge 104. The quick connector 8 is connected with the throat 4 through a pipeline penetrating the spray head body 3.

The driving mechanism is a cylinder driving mechanism 9, a linear driving mechanism 10, a gear transmission mechanism 11, a cam driving mechanism 12 or a crank block mechanism 13.

As shown in fig. 3, the cylinder driving mechanism 9 includes a cylinder body 901, a cylinder guide 902, and a cylinder mover 903, one side of the cylinder mover 903 is fixed to the blade 101, and the other side of the cylinder mover 903 is connected to the cylinder body 901 through the cylinder guide 902.

As shown in fig. 4, the linear driving mechanism 10 includes a linear driving stator 1001 and a linear driving mover 1002, one end of the linear driving mover 1002 is fixed to the blade 101, and the other end of the linear driving mover 1002 is inserted into the linear driving stator 1001.

As shown in fig. 5, the gear transmission mechanism 11 includes a rack 1101, a gear 1102 and a circumferential rotation motor 1103, one end of the rack 1101 is fixedly connected to the blade 101, the gear 1102 is engaged with the rack 1101, a through hole is formed in the center of the gear 1102, and an output shaft of the circumferential rotation motor 1103 passes through the through hole and is engaged with the gear 1102.

As shown in fig. 6, the cam driving mechanism 12 includes a guide frame 1201, a spring 1202, a cam 1203, and a circular rotation motor 1103, the spring 1202 is mounted between the head main body 3 and the cutter body 101 through the guide frame 1201, a through hole is opened in the center of the cam 1203, an output shaft of the circular rotation motor 1103 passes through the through hole and engages with the cam 1203, and a side surface of the cam 1203 abuts against an outer edge of the cutter body 101.

As shown in fig. 7, the crank-slider mechanism 13 includes a primary crank 1301, a secondary crank 1302, a slider 1303, a linear guide 1304, and a circular rotating motor 1103, a through hole for matching with an output shaft of the circular rotating motor 1103 is opened at one end of the primary crank 1301, the other end of the primary crank 1301 is hinged to one end of the secondary crank 1302, the other end of the secondary crank 1302 is hinged to the slider 1303, the slider 1303 is disposed in the linear guide 1304, and one side of the slider 1303 is fixedly connected to the blade 101.

The specific assembly mode of the invention is as follows:

the shearing knife 1 is installed in the installation groove 304 on the spray head mechanism, the driving mechanism is connected with the shearing knife 1, and the driving mechanism and the spray head mechanism are connected with the coupling controller through an external circuit.

Wherein it is L type structure to cut sword 1, cuts one side that sword 1 stretched into in mounting groove 304 and is longer bottom surface, the bottom surface is parallel with mounting groove 304, and the another side is shorter side, the side is perpendicular with mounting groove 304, offers a plurality of mounting holes 102 on the side of cutting sword 1, through mounting hole 102 can be with cutting sword 1 spiro union to actuating mechanism's different positions. The cutting edge of the shearing knife 1 is of a bevel structure, the cutting edge is of an acute angle to ensure the sharpness of the cutting edge, and the shearing knife 1 can be respectively provided with a forward acute-angle cutting edge 103 with a cutting edge angle smaller than +90 degrees or a reverse acute-angle cutting edge 104 with a cutting edge angle larger than-90 degrees according to different acute-angle directions of the cutting edge. (the cutting edge angle is that the one side that shears sword 1 has the cutting edge leans on the horizontal plane, when the one side that has mounting hole 102 is located the right side, the horizontal plane clockwise rotation is to the angle of rotating when coinciding with the cutting edge inclined plane, and the cutting edge angle is positive when prescribing that the horizontal plane initial direction of rotation is up, the cutting edge angle is negative when the horizontal plane initial direction of rotation is down.) blade 101 adopts the material that the rigidity is stronger, difficult production is buckled, under guaranteeing not to produce the deformation and the cracked condition that influence shearing motion in the shearing motion process, make shear sword 1 satisfy the design of lightweight and smallness as far as possible. The forward acute cutting edge 103 is required to be attached to the lower surface of the mounting groove 304 at the bottom surface, and the reverse acute cutting edge 104 is required to be attached to the upper surface of the mounting groove 304 at the bottom surface, so as to ensure the accuracy and stability of the shearing movement.

In this embodiment, the driving mechanism may be divided into an air cylinder driving mechanism 9, a linear driving mechanism 10, a gear transmission mechanism 11, a cam driving mechanism 12 or a slider-crank mechanism 13, and in the actual use process, the form of the driving mechanism may be adjusted as required, and the driving mechanism may transmit the linear reciprocating motion or the circular motion of the power source to the shearing knife 1 to realize the linear reciprocating motion of the shearing knife 1. The cylinder driving mechanism 9 adopts a double-column cylinder guide rail 902, can ensure the motion stability of the cylinder, and realizes the cutting treatment of continuous fibers through the linear reciprocating motion of the cylinder. The power source of the linear driving mechanism 10 includes an electric cylinder, a voice coil motor, a linear motor, etc., and the linear driving rotor 1002 is connected with the shearing knife 1 to drive the shearing knife 1 to make linear reciprocating motion, so as to realize the shearing treatment of continuous fibers. In the gear transmission mechanism 11, the rotational motion of the circular rotation motor 1103 is converted into the linear reciprocating motion of the cutter 1 by the rack 1101 and the gear 1102, thereby cutting the continuous fibers. In the cam driving mechanism 12, the shearing knife 1 is connected with the guide frame 1201 and the spring 1202, the guide frame 1201 is composed of two sections of cylinders and is fixedly connected to the shearing knife 1 and the nozzle body 3 respectively, the spring 1202 is sleeved on the spring guide frame 1201 to ensure that the action direction of the spring 1202 is always parallel to the shearing direction, the side edge of the cam 1203 abuts against the side edge of the shearing knife 1, in the cam driving mechanism 12, the shearing knife 1 is fixed in a horizontal sliding rail or other horizontal guiding structures, the shearing knife 1 is pushed to move by rolling of the cam 1203, the rotary motion of the motor is converted into the linear cutting motion of the shearing knife 1, the shearing knife 1 is restored to the initial position after each cutting through the acting force of the spring 1202, and the shearing treatment of continuous fibers is realized. The crank-slider mechanism 13 can convert the rotation of the motor into the linear reciprocating motion of the shearing blade 1 to realize the shearing treatment of the continuous fibers, and the circumferential rotating motor 1103 used in the crank-slider mechanism 13, the cam driving mechanism 12 and the gear transmission mechanism 11 can be a stepping motor, a servo motor, a dc motor with an encoder, or the like.

The coupling control system for coordinating the shearing motion and the 3D printing motion further comprises a shearing motion controller, a 3D printing motion controller and a coupling motion controller, wherein the shearing motion controller mainly controls the shearing motion of the shearing mechanism, the 3D printing motion controller mainly controls X, Y, Z shaft motion of the 3D printer, wire feeding mechanism motion and other 3D printer auxiliary motions, and the coupling motion controller mainly has the function of sending a control command of coordinating motion to the shearing motion controller and the 3D printing motion controller so that the shearing motion and the 3D printing motion are matched with each other to realize the 3D printing of the high-quality continuous fiber reinforced thermoplastic composite material.

The connecting piece 5 and the nozzle 7 can be of an integral structure or a split structure. The mounting slot 304 must extend through and can only extend through one feed line, and the mounting slot 304 should open between the inlet of the feed line and the end of the nozzle 7. Continuous fibers to be cut are fed into one feeding pipeline, high-temperature molten thermoplastic resin is fed into the other feeding pipeline, the shearing knife 1 is required to be arranged at the same side of the feeding pipeline into which the continuous fibers are fed, and the raw materials fed into the two feeding pipelines can be interchanged before the shearing knife 1 is arranged. The nozzle body 3 is provided with a plurality of heat dissipation grooves 303, and the surface of the nozzle body 3 is partitioned into a plurality of heat dissipation fins 301 through the heat dissipation grooves 303, so that efficient heat dissipation is realized in cooperation with the heat dissipation fan 2.

The specific application method of the invention is as follows:

the method comprises the steps of firstly, detecting a current instruction and a next instruction of a G-code file (a 3D printing instruction set file) in real time through a coupling controller, and setting the printing speed to be a preset cutting printing speed if the next instruction triggers a cutting signal, wherein the cutting printing speed is lower than the common printing speed, so that the method is suitable for fine processing.

And secondly, triggering a shearing signal to control the shearing mechanism to shear the fiber material at the blade, wherein the length of the fiber from the cutting part to the extrusion port of the nozzle 7 is known and fixed, and can be directly measured from the nozzle body 3.

And thirdly, controlling the 3D printing nozzle to stably and completely print the cut fibers with the known fixed length at the shearing printing speed.

And fourthly, controlling the shearing mechanism to move to the initial position, simultaneously controlling the 3D printing mechanism to move to the next printing initial position, and simultaneously controlling the heating module to reach the printing temperature.

And fifthly, controlling the wire feeder to feed the continuous fibers to the nozzle 7, wherein the feeding amount is the distance from the known fixed cutting position to the extrusion opening of the nozzle 7.

And sixthly, detecting the G-code file of the 3D printing instruction set and executing the next printing task.

The six steps are circularly performed, and high-quality 3D printing of the continuous fiber reinforced thermoplastic composite material is realized, the method is mainly used for shearing the continuous fibers in the 3D printing process of the continuous fiber reinforced thermoplastic composite material, and can also be applied to shearing materials which are not easy to melt and break in the 3D printing process, so that the surface quality and the mechanical property of a 3D printing formed part are ensured.

The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.