3D printer nozzle for composite structures capable of simultaneous extrusion of resin and reinforced fiber

Abstract

The present invention relates to a 3D printer nozzle for a composite material structure capable of simultaneously extruding resin and reinforcing fibers, and is characterized by comprising: a jig having a first transfer hole and a second transfer hole formed through from top to bottom so that the resin and reinforcing fibers can be independently fed and discharged, respectively; an extruder formed at the bottom of the jig that extrudes the independently fed resin and reinforcing fibers in the form of a towpreg at once; a cutting part formed embedded in the back surface of the jig that slides horizontally to cut the length of the reinforcing fibers according to the shape or position of the printed object; and a filter block embedded in the back surface of the jig that supports the position of the cutting part and collects dust scattered when the cutting part cuts the reinforcing fibers.

Description

Technology Field

[0001] The present invention relates to a 3D printer nozzle for composite material structures capable of simultaneously extruding resin and reinforcing fibers, and more specifically, to a 3D printer nozzle for composite material structures capable of simultaneously extruding resin and reinforcing fibers to improve the strength of the printed object by simultaneously extruding and layering resin and reinforcing fibers from a single nozzle. Background Technology

[0002] A 3D printer is a device that creates objects by printing continuous layers of material like a 2D printer and stacking them. Because it can rapidly produce objects based on digitized drawing information, it has been utilized for purposes such as modeling or sample production prior to mass production. However, recently, as a technological foundation has been established to enable its use in molding products capable of mass production, focusing on multi-variety, small-batch products, 3D printers are entering the commercialization stage.

[0003] Generally, 3D printers are classified into additive 3D printers (additive or rapid prototyping) that build up layers one by one and subtractive machining methods (computer numerical control engraving) that cut away large blocks, depending on the method of creating three-dimensional shapes, and the objects of three-dimensional shapes can be determined in various ways.

[0004] The FDM (Fused Deposition Modeling) method is a representative additive manufacturing method, also known as FFF (Fused Filament Febrication). It utilizes a thermoplastic resin filament to build layers from the bottom up; the filament melts as it passes through a heated extruder, and the molten material flows out through a nozzle and is deposited onto an output plate, thereby forming the desired shape.

[0005] The additive method described above has the advantage of being very inexpensive compared to other types of 3D printers, and in additive 3D printers, the extruder is a very important part that determines the printing speed and quality of the 3D printer.

[0006] Korean Patent Publication No. 10-2017-0088479, which applies this stacking method, relates to a 3D printer equipped with a linear stepper motor, wherein the extruder is configured to extrude a material by pressing the material receiving portion while raising and lowering the shaft penetrating the stepper motor according to the rotation direction of the stepper motor.

[0007] However, in the case of the conventional technology described above, since it is configured to produce an output by extruding only a single material, there was a problem in that it is difficult to maintain the shape until the laminated material hardens, and it can easily collapse due to small loads or external forces.

[0008] In addition, since only a single material is used, there was a problem in that the strength or toughness after curing is dependent on the physical properties of the single material, and the strength or toughness cannot be improved to suit the application of the printed structure. Prior art literature

[0009] Korean Patent Publication No. 10-2017-0088479 The problem to be solved

[0010] The objective of the present invention to solve the above-mentioned problems is to provide a 3D printer nozzle for composite material structures capable of simultaneous extrusion of resin and reinforcing fibers, which can improve the strength or toughness of a laminate by extruding the resin and reinforcing fibers simultaneously in a mixed state from a single nozzle.

[0011] In addition, another objective of the present invention is to provide a 3D printer nozzle for composite material structures capable of simultaneous extrusion of resin and reinforcing fibers, which prevents the reinforcing fibers from being exposed to the outside after lamination by automatically cutting and supplying the reinforcing fibers according to the shape and strength enhancement position of the output laminate.

[0012] In addition, another objective of the present invention is to provide a 3D printer nozzle for composite material structures capable of simultaneous extrusion of resin and reinforcing fibers, which enables high-speed repetitive cutting so that short reinforcing fibers can be supplied according to the output section, and can collect and separately remove dust scattered during the cutting of reinforcing fibers. means of solving the problem

[0013] The 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention for solving the above problem is characterized by comprising: a jig having a first transfer hole and a second transfer hole formed through from top to bottom so that the resin and reinforcing fiber can be independently fed and discharged, respectively; an extruder formed at the bottom of the jig that extrudes the independently fed resin and reinforcing fiber in the form of a towpreg at once; a cutting part formed embedded in the back surface of the jig and sliding in a horizontal direction to cut the length of the reinforcing fiber according to the shape or position of the printed object; and a filter block embedded in the back surface of the jig to support the position of the cutting part and to collect dust scattered when the cutting part cuts the reinforcing fiber.

[0014] In addition, the jig of the 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention is characterized by comprising: a recessed groove formed on the back surface and recessed inward so that a cutting part and a filter block can be embedded therein; a cooling fin formed on the front surface that increases the contact area with air to dissipate heat transferred from the extruder into the air for cooling; and Teflon tubes formed in the first transfer hole and the second transfer hole, respectively, which block heat transfer from the extruder to prevent the resin from melting or the reinforcing fiber from unraveling.

[0015] In addition, the extruder of the 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention is characterized by comprising: a flow path block formed internally, wherein a V-shaped flow path is formed so that resin and reinforcing fiber are fed in from the top and discharged as one from the bottom; a heater block formed on the outer surface of the flow path block, which heats the flow path block to melt the resin and unravel the twisted reinforcing fiber; and an extrusion pipe formed at the bottom of the heater block, which discharges the resin and reinforcing fiber mixed as one through the flow path block.

[0016] In addition, the cutting part of the 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention is characterized by comprising: a blade formed to cut a reinforcing fiber fed into a second transfer hole; a slider formed such that one side is formed to be coupled with the blade and is formed to slide horizontally while embedded in the back surface of a jig; a driving motor formed outside the jig to transmit power to operate the slider and to adjust the cutting length of the reinforcing fiber according to the rotational speed; and a link section formed between the slider and the driving motor to convert the rotation of the driving motor into a linear motion and repeatedly move the slider horizontally.

[0017] In addition, the filter block of the 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention is characterized by comprising a collection slot formed on the upper and lower surfaces respectively and carved inward along the direction in which the cutting part slides, and a collection oil applied to the collection slot to reduce friction generated when the cutting part slides and to prevent dust scattered into the collection slot from leaking outward when the reinforcing fiber is cut.

[0018] In addition, the cutting part of the 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention is characterized by being able to control the cutting length of the reinforcing fibers while adjusting the sliding speed according to the output code of the 3D printer. Effects of the invention

[0019] As described above, according to the 3D printer nozzle for composite material structures capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention, the resin and reinforcing fibers are extruded simultaneously in a mixed state from a single nozzle, thereby having the effect of improving the strength or toughness of the laminate.

[0020] In addition, according to the 3D printer nozzle for composite material structures capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention, by automatically cutting and supplying reinforcing fibers according to the shape and strength enhancement position of the printed laminate, it is possible to prevent reinforcing fibers from being exposed to the outside after lamination.

[0021] In addition, according to the 3D printer nozzle for composite material structures capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention, high-speed repetitive cutting is possible, allowing short reinforcing fibers to be supplied according to the printing section, and there is an effect of collecting and separately removing dust scattered during the cutting of reinforcing fibers. Brief explanation of the drawing

[0022] FIG. 1 is a perspective view showing a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention. FIG. 2 is a perspective view of a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention. FIG. 3 is a cross-sectional view of a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention. FIG. 4 is a rear view showing the back of a jig for a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention. FIG. 5 is a perspective view showing the blade and slider of a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention. FIG. 6 is a perspective view showing a filter block of a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention. Specific details for implementing the invention

[0023] The specific features and advantages of the present invention will be described in detail below with reference to the accompanying drawings. Prior to this, if it is determined that a detailed description of the functions and configurations related to the present invention may unnecessarily obscure the essence of the invention, such detailed description will be omitted.

[0024] The present invention relates to a 3D printer nozzle for composite material structures capable of simultaneously extruding resin and reinforcing fibers, and more specifically, to a 3D printer nozzle for composite material structures capable of simultaneously extruding resin and reinforcing fibers to improve the strength of the printed object by simultaneously extruding and layering resin and reinforcing fibers from a single nozzle.

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0026] FIG. 1 is a perspective view showing a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention installed, FIG. 2 is a perspective view of a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention, and FIG. 3 is a cross-sectional view of a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention.

[0027] As illustrated in FIGS. 1 to 3, the 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention is characterized by comprising: a jig (100) having a first transfer hole (110) and a second transfer hole (120) formed through from top to bottom so that the resin and reinforcing fiber can be independently fed and discharged, respectively; an extruder (200) formed at the bottom of the jig (100) and extruding the independently fed resin and reinforcing fiber in the form of a towpreg at once; a cutting part (300) formed by being embedded in the back surface of the jig (100) and sliding in a horizontal direction to cut the length of the reinforcing fiber according to the shape or position of the output; and a filter block (400) embedded in the back surface of the jig (100) to support the position of the cutting part (300) and to collect dust scattered when the cutting part (300) cuts the reinforcing fiber.

[0028] Additionally, the jig (100) is characterized by comprising: a recess (130) formed on the back surface and recessed inward so that a cutting portion (300) and a filter block (400) can be embedded therein; a cooling fin (140) formed on the front surface that increases the contact area with air to dissipate heat transferred from the extruder (200) into the air for cooling; and a Teflon tube (150) formed in the first transfer hole (110) and the second transfer hole (120), respectively, which blocks heat transfer from the extruder (200) to prevent the resin from melting or the reinforcing fiber from unraveling.

[0029] Additionally, the extruder (200) is characterized by comprising: a flow path block (210) formed internally, in which a V-shaped flow path is formed so that resin and reinforcing fibers are fed from the top and discharged as one from the bottom; a heater block (220) formed on the outer surface of the flow path block (210), which heats the flow path block (210) to melt the resin and unravel the twisted reinforcing fibers; and an extrusion pipe (230) formed on the bottom of the heater block (220), which discharges the resin and reinforcing fibers mixed as one through the flow path block (210).

[0030] Additionally, the cutting section (300) is characterized by comprising a blade (310) formed to cut the reinforcing fiber inserted into the second transfer hole (120), a slider (320) formed so that one side can be connected to the blade (310) and is formed to slide horizontally while embedded in the back surface of the jig (100), a drive motor (330) formed outside the jig (100) to transmit power to operate the slider (320) and to adjust the cutting length of the reinforcing fiber according to the rotational speed, and a link section (340) formed between the slider (320) and the drive motor (330) to convert the rotation of the drive motor (330) into a linear motion and repeatedly move the slider (320) horizontally.

[0031] In addition, the cutting section (300) is characterized by being able to adjust the cutting length of the reinforcing fiber as the sliding speed is adjusted according to the output code of the 3D printer.

[0032] The nozzle is coupled to a transfer platform (10) formed so that its position can be varied along a transfer rail (20) formed in the 3D printer, and the transfer platform (10) is formed so that it can manufacture a printed object according to an output code input into the 3D printer by extruding resin and reinforcing fibers at an input position while being transferred in a state coupled to the transfer rail (20).

[0033] At this time, the nozzle is formed to be able to move in 2 axes or 3 axes according to the variable position of the transfer rail (20) and the transfer table (10) formed in the 3D printer, and the degree of freedom of the nozzle to be variable may vary depending on the 3D printer.

[0034] The nozzle attached to the front of the transfer table (10) is largely divided into a jig (100), an extruder (200), a cutting section (300), and a filter block (400).

[0035] The jig (100) is formed in a fixed state by being attached to the front of the transfer table (10) and is used to receive resin and reinforcing fibers supplied from the 3D printer, respectively, and to move them to the extruder (200).

[0036] To this end, the jig (100) is provided with a first transfer hole (110) formed on one side of the upper portion and penetrating downward, and a second transfer hole (120) formed on the other side of the upper portion and penetrating downward. A resin in the form of a filament is introduced into the first transfer hole (110), and a reinforcing fiber in the form of a wire, formed by twisting multiple carbon fiber strands, is introduced into the second transfer hole (120).

[0037] In this case, the reinforcing fibers may be manufactured using glass fibers or Kevlar in addition to carbon fibers, depending on the needs.

[0038] That is, the resin and the reinforcing fiber can be separated independently through the first transfer hole (110) and the second transfer hole (120) and transferred to the extruder (200), and the reinforcing fiber passing through the second transfer hole (120) by the cutting part (300) can be cut to a length set according to the output code input into the 3D printer and moved to the extruder (200).

[0039] The extruder (200) has a Y-shaped flow path so that the resin and reinforcing fibers supplied through the first transfer hole (110) and the second transfer hole (120) are independently supplied from the top and discharged as one from the bottom.

[0040] The extruder (200) is divided into a flow path block (210) and a heater block (220), and the flow path block (210) has a V-shaped flow path formed inside, and the heater block (220) has an I-shaped flow path formed penetrating from the top to the bottom, so that when the flow path block (210) and the heater block (220) are combined, a Y-shaped flow path can be formed.

[0041] The Euroblock (210) is formed in a V-shape on the upper side and is used to guide the resin and reinforcing fibers supplied from the jig (100) to be independently supplied and then moved into a single flow path through the heater block (220).

[0042] The heater block (220) is configured such that a heater hole (221) is provided on the side to allow a heater and a temperature measuring sensor to be inserted, and when the heater is heated, the heater block (220) is heated, melting the resin located inside and causing the twisted reinforcing fibers to unravel due to the heat, thereby allowing the two materials to fuse.

[0043] At this time, the heater block (220) is formed in an L-shape so as to wrap around the lower surface and the front surface of the Euro block (210), and as a result, when the heater block (220) is heated, the Euro block (210) is also heated together, so that the resin is melted in advance before the two materials fuse together, and the reinforcing fibers are guided to enter the heater block (220) in a pre-unraveled state.

[0044] In addition, an extrusion pipe (230) is provided in the lower center of the heater block (220) to extrude and discharge a towpreg in which resin and reinforcing fibers are fused, and the extrusion pipe (230) allows the towpreg to be discharged by pressurizing it, thereby enabling selective printing according to the output position of the 3D printer.

[0045] In other words, since the strength or toughness of the printed object can be improved through towpreg, which is a resin with reinforcing fibers fused to it, the 3D printed object can be used even in load-bearing structures.

[0046] An extruder (200) is coupled to the lower part of the jig (100), and when the heater block (220) and the flow block (210) of the extruder (200) are heated, heat conduction occurs in the jig (100), and the resin and reinforcing fibers passing through the jig (100) can be melted or released by the heat.

[0047] To prevent this, the jig (100) is configured not to be directly connected to the extruder (200) but to be connected to the extruder (200) in a spaced-away state through a Teflon tube (150) to prevent heat conduction, and since the Teflon tube (150) has low thermal conductivity, it can insulate or block heat generated from the induction block, thereby preventing the jig (100) from heating up.

[0048] At this time, the upper end of the Teflon tube (150) is connected to the first transfer hole (110) and the second transfer hole (120) formed in the lower part of the jig (100), respectively, and the lower end is connected to the V-shaped flow path formed in the flow path block (210), respectively, and then can be fixed by fastening with a bolt.

[0049] Through the Teflon tube (150), the resin and reinforcing fibers can be prevented from melting or unraveling due to heat transfer as they pass through the jig (100), and cooling fins (140) are formed on the jig (100) to dissipate heat generated by the flow and radiative heat transfer that occurs as the resin melts inside the extruder (200).

[0050] A number of cooling fins (140) are formed on the front surface of the jig (100) in a spaced-apart manner, and the air contact area is improved through the number of cooling fins (140), so that when heat is transferred, it can be rapidly dissipated into the air, thereby preventing the temperature of the jig (100) from rising.

[0051] At this time, a cooling fan (160) is positioned on the front of the cooling fin (140) to blow air and air-cool the jig (100) so as to improve the cooling performance of the jig (100), thereby blowing external air toward the jig (100) to maximize the heat dissipation effect by the cooling fin (140).

[0052] The cooling fan (160) may be configured to be attached to the front of the jig (100), but it is preferable that it be attached to the transfer platform (10) so as to be formed at a position spaced apart from the front of the jig (100).

[0053] A multi-stage embedded groove (130) is formed on the back surface of the jig (100). The embedded groove (130) is configured to first provide a space so that a slider (320) to which the blade (310) of the cutting part (300) is attached can slide toward the second transfer hole (120), and secondly provide a space to which a filter block (400) can be attached so as not to separate the slider (320) to the outside.

[0054] The detailed configuration of the landfill home (130) will be described later together with the attached Fig. 4.

[0055] The cutting unit (300) is used to cut the reinforcing fiber passing through the second transfer hole (120) to a length set according to the output code, and the cutting unit (300) is controlled by a 3D printer to adjust the length of the reinforcing fiber according to the shape or output position of the output.

[0056] To this end, the cutting part (300) is formed with a slider (320) that can be inserted into a buried groove (130) formed on the back surface of the jig (100) and moved horizontally toward the second transfer hole (120), and a blade (310) is attached to the slider (320) so that when the slider (320) is moved horizontally, it can cut the reinforcing fiber passing through the second transfer hole (120).

[0057] At this time, the slider (320) waits at a position spaced apart from the second transfer hole (120) and then slides toward the second transfer hole (120) to cut the reinforcing fiber, and immediately after cutting, returns to the initial position spaced apart from the second transfer hole (120) and waits.

[0058] That is, the slider (320) can adjust the sliding interval according to the length of the reinforcing fiber, and when a short length of reinforcing fiber is required, the number of times the slider (320) operates increases so that the reinforcing fiber is cut frequently, and when a long length of reinforcing fiber is required, the number of times the slider (320) operates decreases so that the reinforcing fiber is cut intermittently.

[0059] In addition, in sections requiring high strength, the reinforcing fibers can be continuously supplied without cutting to form long lengths, and in sections requiring high precision or complex shapes, the reinforcing fibers can be repeatedly cut at high speed to form short lengths.

[0060] To slide the slider (320), the cutting section (300) is formed spaced apart from the side of the jig (100) and is equipped with a driving motor (330) coupled to the transfer platform (10), and further includes a link section (340) for repeatedly operating the slider (320) in a horizontal direction.

[0061] The link section (340) connects the edge of the rotating disc and the end of the slider (320) to each other, and when the drive motor (330) rotates, the link section (340) connected to the edge of the disc rotates along the disc, thereby enabling the slider (320) to move in a horizontal direction.

[0062] At this time, it is preferable that the link section (340) has multiple links connected so that they can rotate by means of a joint, and through this, when the disc is rotated by the drive motor (330), each link spreads out and the slider (320) can be moved in the horizontal direction.

[0063] Additionally, since one side of the slider (320) is inserted into the embedded groove (130) of the jig (100) and the other side is in close contact with the filter block (400), it is possible to move only in the horizontal direction of the jig (100).

[0064] If necessary, the link section (340) may be formed similarly to the crank structure of the vehicle.

[0065] The drive motor (330) cuts the reinforcing fibers according to the shape or output position of the output input into the 3D printer and fuses them with the resin. In the case of rounded parts or complex shapes of the output, it is desirable to shorten the length of the reinforcing fibers to prevent the reinforcing fibers from being exposed to the outside.

[0066] In addition, it is desirable to prevent the drive motor (330) from operating in sections where reinforcing fibers are not needed, and it is desirable for the drive motor (330) to operate in accordance with the output code input from the 3D printer.

[0067] In particular, since the slider (320) advances and then retracts horizontally by one rotation of the drive motor (330) to cut the reinforcing fiber, the length of the reinforcing fiber can be adjusted at high speed and precision by controlling the rotation speed of the drive motor (330), even if a very short length is required or if there is a need to supply reinforcing fibers of various lengths in a specific section.

[0068] The filter block (400) is used to support the position of the slider (320) and to reduce the frictional force generated when the slider (320) slides, thereby suppressing noise, and to collect dust scattered when the blade (310) cuts the reinforcing fiber, so as not to leak out of the nozzle.

[0069] In addition, the filter block (400) can be replaced depending on the dust collection status, and the detailed structure and collection method will be described later through the attached drawings.

[0070] FIG. 4 is a rear view showing the back of a jig (100) of a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention, FIG. 5 is a perspective view showing a blade (310) and a slider (320) of a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention, and FIG. 6 is a perspective view showing a filter block (400) of a 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention.

[0071] As illustrated in FIGS. 4 to 6, the filter block (400) of the 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber according to the present invention is characterized by comprising a collection slot (410) formed on the upper and lower sides respectively and carved inward along the direction in which the cutting part (300) slides, and a collection oil applied to the collection slot (410) to reduce friction generated when the cutting part (300) slides and to prevent dust scattered into the collection slot (410) from leaking outward when the reinforcing fiber is cut.

[0072] The embedded groove (130) formed on the back surface of the jig (100) is formed in multiple stages, and is formed with a first stage to limit the position where the slider (320) is inserted and slides up to the second transfer hole (120), and a second stage formed to allow the filter block (400) to be inserted.

[0073] In the case of the first step, it is cut in an L-shape so that an L-shaped slider (320) can be inserted, and is cut to a position so that the slider (320) advances toward the second transfer hole (120) to cut the reinforcing fiber, and retracts in the opposite direction of the second transfer hole (120) so that the reinforcing fiber can pass through the second transfer hole (120).

[0074] The second step is used to secure a filter block (400) embedded in the jig (100) to prevent the slider (320) from being separated from the back surface of the jig (100), and is formed to match the shape or size of the filter block (400).

[0075] Through this, when the slider (320) is inserted into the first step and the filter block (400) is inserted into the second step, one side of the slider (320) is in close contact with the first step and the other side is supported by the filter block (400), allowing it to slide within the first step.

[0076] One side of the slider (320) is separated into upper and lower sections so that a blade (310) can be inserted and fixed in the center, and when the blade (310) is worn out, the blade (310) can be separated from the slider (320) and replaced.

[0077] The filter block (400) is inserted into the second step of the embedded groove (130) and contacts the other side of the slider (320) when the slider (320) slides, thereby preventing the slider (320) from moving away from the back of the jig (100), preventing noise and wear caused by friction, and is used to collect fine dust scattered as the blade (310) cuts the reinforcing fiber.

[0078] To this end, a collection slot (410) formed horizontally is provided on the upper and lower sides of one surface of the filter block (400) that contacts the slider (320), and the spacing between the collection slots (410) formed on the upper and lower sides is formed to be smaller than or equal to the height of the slider (320).

[0079] When the slider (320) slides, it slides horizontally along the collection slots (410) formed between the upper and lower parts. At this time, high-viscosity collection oil is injected and applied to the collection slots (410), so that when the slider (320) slides, the friction between the slider (320) and the collection block is reduced by the collection oil, thereby reducing noise and preventing wear.

[0080] Additionally, when the blade (310) of the slider (320) cuts the reinforcing fiber, the twisted reinforcing fiber is partially unraveled by elastic force, and the fiber powder on the cut surface is scattered around in the form of dust. At this time, the scattered dust moves into the collection slot (410) and comes into contact with the collection oil and adheres.

[0081] That is, dust that is scattered can be accumulated inside the collection slot (410), and dust that is adhered to by the collection oil can be prevented from being scattered again, so that dust can be prevented from being scattered inside the 3D printer even if high-speed repeated cutting is performed.

[0082] While grease is most suitable as the capture oil, any semi-solid, high-viscosity oil capable of lubrication can be used.

[0083] In addition, since the collection block is replaceable, if dust accumulates excessively inside the collection slot (410), the collection block can be separated, cleaned, and then reattached and used after injecting and applying collection oil, and it can also be used by periodically replacing it like a filter as needed.

[0084] As described above, according to the 3D printer nozzle for composite material structures capable of simultaneous extrusion of resin and reinforcing fibers according to the present invention, the strength or toughness of the laminate can be improved by simultaneously extruding the resin and reinforcing fibers in a mixed state from a single nozzle, and the reinforcing fibers can be automatically cut and supplied according to the shape and strength improvement position of the printed laminate, thereby preventing the reinforcing fibers from being exposed to the outside after lamination, and high-speed repetitive cutting is possible so that short reinforcing fibers can be supplied according to the printing section, and dust scattered during the cutting of reinforcing fibers can be collected and removed separately.

[0085] As described above, although the present invention has been explained with reference to preferred embodiments, those skilled in the art may implement the present invention by making various modifications or variations without departing from the technical spirit and scope described in the claims of the present invention. Accordingly, the scope of the present invention should be interpreted by the claims described to include such many examples of variations. This project (result) is a research project conducted with funding from the government (Ministry of Science and ICT) and supported by the National Research Foundation of Korea (RS-2022-NR072163), and is also the result of the Local Government-University Cooperation-based Regional Innovation Project conducted in 2023 with funding from the Ministry of Education and supported by the National Research Foundation of Korea (2022RIS-006). Explanation of the symbols

[0086] 10 : Transfer table 20 : Transfer rail 100 : Jig 110 : 1st transfer hole 120 : 2nd transfer hole 130 : Burial groove 140 : Cooling fins 150 : Teflon tube 160 : Cooling fan 200 : Extruder 210 : Euroblock 220 : Heaterblock 221 : Heater hole 230 : Extrusion pipe 300: Cutting section 310: Blade 320 : Slider 330 : Drive motor 340 : Link phrase 400 : Filter block 410 : Capture Slot

Claims

Claim 1 A jig having a first transfer hole and a second transfer hole penetrating from top to bottom so that resin and reinforcing fibers can be independently fed and discharged; an extruder formed at the bottom of the jig that extrudes the independently fed resin and reinforcing fibers in a towpreg form at once; a cutting part formed embedded in the back surface of the jig that slides horizontally to cut the length of the reinforcing fibers according to the shape or position of the output; and a filter block embedded in the back surface of the jig to support the position of the cutting part and to collect dust scattered when the cutting part cuts the reinforcing fibers; wherein the filter block comprises a collection slot formed at the top and bottom of one side respectively and recessed inward along the direction in which the cutting part slides; and a collection oil applied to the collection slot to reduce friction generated when the cutting part slides and to prevent dust scattered into the collection slot from leaking outward when the reinforcing fibers are cut. 3D printer nozzle for extrusion-capable composite material structures. Claim 2 A 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers, characterized in that, in claim 1, the jig comprises: a recess formed on the back surface and recessed inwardly so that the cutting portion and the filter block can be embedded; a cooling fin formed on the front surface that increases the contact area with air to dissipate heat transferred from the extruder into the air for cooling; and Teflon tubes formed in the first transfer hole and the second transfer hole, respectively, which block heat transfer from the extruder to prevent the resin from melting or the reinforcing fiber from unraveling. Claim 3 A 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers according to claim 1, characterized in that the extruder comprises: a flow block formed internally, having a V-shaped flow path formed so that the resin and the reinforcing fiber are respectively fed from the top and discharged as one from the bottom; a heater block formed on the outer surface of the flow block, heating the flow block to melt the resin and unravel the twisted reinforcing fibers; and an extrusion pipe formed at the bottom of the heater block, discharging the resin and the reinforcing fibers mixed as one through the flow block. Claim 4 A 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fiber, characterized in that, in claim 1, the cutting part comprises: a blade formed to cut the reinforcing fiber fed into the second transfer hole; a slider formed such that one side is formed to be coupled with the blade and is formed to slide horizontally while embedded in the back surface of the jig; a drive motor formed outside the jig to transmit power to operate the slider and to adjust the cutting length of the reinforcing fiber according to the rotational speed; and a link section formed between the slider and the drive motor to convert the rotation of the drive motor into a linear motion and repeatedly move the slider horizontally. Claim 5 delete Claim 6 A 3D printer nozzle for a composite material structure capable of simultaneous extrusion of resin and reinforcing fibers, characterized in that, in claim 1, the cutting part is capable of controlling the cutting length of the reinforcing fiber while adjusting the sliding speed according to the output code of the 3D printer.

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