WO2017142284A1 - Appareil d'impression tridimensionnelle de grande surface à base de scanner laser, auquel un usinage est appliqué - Google Patents

Appareil d'impression tridimensionnelle de grande surface à base de scanner laser, auquel un usinage est appliqué Download PDF

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Publication number
WO2017142284A1
WO2017142284A1 PCT/KR2017/001579 KR2017001579W WO2017142284A1 WO 2017142284 A1 WO2017142284 A1 WO 2017142284A1 KR 2017001579 W KR2017001579 W KR 2017001579W WO 2017142284 A1 WO2017142284 A1 WO 2017142284A1
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WIPO (PCT)
Prior art keywords
machining
unit
metal powder
moving
galvano scanner
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PCT/KR2017/001579
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English (en)
Korean (ko)
Inventor
이철수
Original Assignee
이철수
주식회사 큐브테크
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Publication of WO2017142284A1 publication Critical patent/WO2017142284A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C1/00—Milling machines not designed for particular work or special operations
    • B23C1/06—Milling machines not designed for particular work or special operations with one vertical working-spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a large-area laser scanner-based three-dimensional printing device applying a machining, specifically a machine that can improve the roughness of a metal three-dimensional structure formed by sintering a metal powder by laser irradiation through a machining process
  • the present invention relates to a large-area laser scanner-based three-dimensional printing device employing processing.
  • the technique of forming a three-dimensional structure is to extrude and laminate thermoplastics, to irradiate a laser beam in a vat containing a liquid photocurable resin, and to form a layer of sculptures in each tank. Whenever the tank goes down, the tank descends by the thickness of the layer and irradiates the laser again to form a three-dimensional structure.
  • the resin is irradiated with light of a shape to be molded into a liquid 'photocurable resin'.
  • the method of forming three-dimensional structure by hardening the layer, forming the three-dimensional structure by extruding liquid color ink and hardening material (binder) into the powder raw material from the nozzle of the print head by using the inkjet printer principle, and forming the three-dimensional structure by metal powder without binder There are various methods such as a direct sintering furnace.
  • the photocurable printer has a merit of being very precise and excellent surface quality, but since it is very expensive to implement it, it is practically difficult to popularize it industrially.
  • the sintered printer is not only porosity but also printing speed is very fast, and the equipment for realizing it is significantly cheaper than the photocurable printer, it is in the spotlight in the expected way in the future.
  • the conventional sintered printer described above has a limited scan area of a galvano scanner for irradiating a laser beam, making it difficult to fabricate a three-dimensional structure having a large area. There is no problem.
  • the present invention has been proposed to solve the problem according to the conventional method, and an object of the present invention is to apply a 2-axis on-the-fly technique to a galvano scanner for irradiating a laser for sintering a metal powder.
  • the present invention provides a large-area laser scanner-based three-dimensional printing apparatus using a machining that can produce a three-dimensional structure having a large area by moving.
  • an object of the present invention is to synchronize the laser irradiation path of the galvano scanner and the movement path of the galvano scanner through the error correction to correspond to the boundary of the scan area when the scan area is changed by biaxial movement of the galvano scanner. It is to provide a large-area laser scanner-based three-dimensional printing device using a machining that can prevent the discontinuity in the dimensional structure.
  • an object of the present invention is to improve the roughness by forming a three-dimensional structure formed by sintering the metal powder, as well as easy to form an under-cut structure, three-dimensional structure It is to provide a large-area laser scanner-based three-dimensional printing device applying a machining process that can be used immediately after the mold is generated.
  • the present invention is a large-area laser scanner-based three-dimensional printing apparatus applying a machining for printing a three-dimensional structure, comprising: a stage unit for receiving metal powder; A galvano scanner for irradiating a laser for sintering to a scan area of the surface of the metal powder; A machining part for processing side surfaces of the metal sintered by the galvano scanner; A first moving part which moves the machining part to an X axis, a Y axis, and a Z axis; And a control unit controlling an irradiation path of the galvano scanner, whether the machine is operated, and a first moving path of the first moving unit according to a command in the horizontal slicing file regarding the three-dimensional structure.
  • the machining unit, the processing motor is activated by the control of the control unit; And it may include an end mill that is rotated by the processing motor.
  • the end mill is a set comprising a flat end mill, a ball end mill, a radial end mill, and a spherical end mill, wherein one of the flat end mill, the ball end mill, the radial end mill, and the spherical end mill It can be connected to the processing motor.
  • the present invention further comprises a second moving unit for moving the galvano scanner in the X-axis and Y-axis in order to achieve the above object, the control unit according to the instructions in the horizontal slicing file for the three-dimensional structure
  • the irradiation path of the galvano scanner and the second moving path of the second moving unit may be controlled, and the irradiation path and the second moving path may be interlocked.
  • the stage unit may include a storage unit storing the metal powder and discharging the metal powder under control of the controller; A base part provided with the metal powder supplied from the storage part and applied to the flat part, the base part being movable vertically by a first distance at a time by the control of the controller; A side wall portion defining an area of a surface of the metal powder on the base portion as a structure of a vertical wall abutting the side of the base portion; And a scraper portion for dispersing the metal powder on the base portion to generate a thin layer under the control of the control portion, wherein the control portion includes: the base portion N times, where N is an integer of 2 or more; The machining unit and the first moving unit may be activated each time.
  • N may be an integer of 5 or more and 15 or less.
  • the control unit may generate a plurality of scan pages corresponding to the size of the scan area by dividing an area of the surface of the metal powder, and refer to the irradiation path and the reference by referring to the shape of the horizontal slicing file for each scan page.
  • the second movement path may be linked.
  • the controller generates a correction command for correcting an error between the second movement path and the measured movement of the galvano scanner and transmits the correction command to the second moving unit, and the second moving unit corrects the correction value of the correction command. You can move according to.
  • the correction command may include an inertia error correction value for correcting an error generated by the inertia of the second moving unit.
  • the large-area laser scanner-based three-dimensional printing apparatus applying the machining according to the present invention, it is possible to manufacture a three-dimensional structure having a large area by biaxially moving a galvano scanner for irradiating a laser for sintering metal powder. Do.
  • the moving path of the galvano scanner when the moving path of the galvano scanner is changed, the moving path is corrected according to the measured path so as to generate a three-dimensional structure having a large area. It is possible to carry out precision sintering continuously on the surface of the metal powder.
  • the large-area laser scanner-based three-dimensional printing apparatus applied to the machining according to the present invention, by performing the machining on the three-dimensional structure formed by sintering the metal powder, to improve the roughness and also to form an undercut structure Since it is easy to form, it can be used for a metal mold
  • Figures 1a to 1c is a view showing a large-area laser scanner based three-dimensional printing apparatus applying the machining according to the present invention.
  • FIG. 2 is a view showing the inside of the galvano scanner of the large-area laser scanner-based three-dimensional printing apparatus applying the machining according to the present invention.
  • FIG 3 is a view showing in detail the stage of the large-area laser scanner-based three-dimensional printing apparatus applying the machining according to the present invention.
  • FIG. 4 is a view for explaining the operation of the large-area laser scanner-based three-dimensional printing apparatus to which the machining according to the present invention is applied.
  • 5a to 5f are views for explaining the operation of the machining unit of the large-area laser scanner-based three-dimensional printing apparatus applying the machining according to the present invention.
  • 1a to 1c is a view showing a large-area laser scanner-based three-dimensional printing apparatus applying a machining according to the present invention, a large-area laser scanner-based three-dimensional printing apparatus applying the machining according to the present invention, the stage unit 100, the galvano scanner 200, the second moving unit 300, the first moving unit 400, the machining unit 600, and the controller 800 may be included.
  • the stage part 100 receives the metal powder, and provides a metal powder surface having a predetermined area B thereon to sinter the shape of the horizontal cross section of the three-dimensional structure. That is, the stage part 100 provides the surface of the metal powder having an area B larger than the scan area A of the galvano scanner 200 so that the horizontal cross section is large, for example, within about 250 mm ⁇ 250 mm.
  • Each section of the three-dimensional structure that may be included can be sintered to provide a printing space for forming the three-dimensional structure from the surface of the metal powder.
  • the metal powder may be composed of only metal particles, but may be composed of two or more kinds of metal particles, and may include titanium (Titanium) having excellent reactivity as an example of the metal, but is not limited thereto.
  • the galvano scanner 200 irradiates the sintering laser along the irradiation path by the control of the control unit 800 in the scan area A among the surfaces of the metal powder uniformly dispersed in the stage unit 100.
  • the laser for sintering may be a laser having a high energy, for example, energy of about 30W to 1000W, preferably 500W.
  • the cross section of the three-dimensional structure may be hardened.
  • the second moving unit 300 moves the galvano scanner 200 along the X-axis and the Y-axis along a moving path under the control of the control unit 800, that is, the second moving path. That is, the second moving unit 300 may include a second X-axis moving unit 310 and a second Y-axis moving unit 320, and are generated by the G code in the control unit 800.
  • the control signal is input, and the galvano scanner 200 is moved along the movement path indicated by the input control signal.
  • the second moving unit 300 may be omitted when the galvano scanner 200 is fixed to scan the entire surface B of the metal powder as shown in FIG. 1C, and the galvano scanner may be omitted. Even if the scan area A of 200 is smaller than the surface B of the metal powder, as shown in FIG. 1B, a non-synchronized travel path may be provided to the irradiation path of the galvano scanner 200.
  • the galvano scanner 200 has a scan area of about several tens of mm2 that can be scanned and processed at one time.
  • the galvano scanner 200 In order for the 200 to process the entire cross-section of the three-dimensional structure, the galvano scanner 200 must move in the X-axis direction and the Y-axis direction along each cross-section of the three-dimensional structure by the second moving part 300.
  • the galvano scanner 200 has an X-axis direction and a Y-axis direction with respect to the metal powder surface on the stage part 100 so that the scan area A of the galvano scanner 200 covers all sections of the three-dimensional structure.
  • the path moving to the second path is called a second moving path.
  • the first moving unit 400 moves the machining unit 600 along the X-axis, the Y-axis, and the Z-axis along a movement path under the control of the controller 800, that is, the first movement path.
  • the first moving unit 400 may include a first X-axis moving unit 410, a first Y-axis moving unit 420, and a Z-axis moving unit 430
  • the control unit 800 may include a G unit.
  • the control signal generated by processing the edge information obtained from the code or the like is input, and the machining unit 600 is moved along the first movement path indicated by the input control signal.
  • the first moving unit 400 may be disposed below the second moving unit 300, but is not limited thereto.
  • the galvano scanner 200 may be moved by the second moving unit 300. ) Moves to an area outside the surface of the metal powder having a predetermined area B, and then the first moving part 400 disposed above the second moving part 300 is machined through the Z-axis moving part 430.
  • the processing unit 600 may be brought close to the edge of the sintered region in the metal powder.
  • the machining unit 600 by processing the side of the metal sintered by the galvano scanner 200 to reduce the roughness of the structure produced by the sintering.
  • the machining unit 600 is a mechanism used for CNC (Computerized Numerical Control) machining, but may be an ultrasonic vibration type grinding machine, but is not limited thereto.
  • the machining unit 600 does not need to process the side surface of the sintered region every time the galvano scanner 200 performs the sintering operation, and the galvano scanner 200 performs the sintering operation two or more times, preferably. For example, it may be processed once each time performed 5 times or more to 15 times or less.
  • the machining unit 600 may perform the galvano scanner 200.
  • the side of the sintered structure having a thickness of about 10 micrometers, that is, about 300 ⁇ m to 500 ⁇ m may be processed at once.
  • control unit 800 according to the instructions in the horizontal slicing file for the three-dimensional structure, the irradiation path of the galvano scanner 200, the second moving path of the second moving unit 300, the machining unit 600 It controls the operation and the first moving path of the first moving unit 400.
  • the control unit 800 the laser proceeds along the path according to the coordinates and the coordinates of the horizontal cross-section for forming the three-dimensional structure through the G code, etc., sliced graphics files stored in the STL (STereoLithography) format
  • the movement speed of the irradiation point may be read, and accordingly, a control signal for designating the irradiation path of the galvano scanner 200 and the second moving path of the second moving unit 300 may be generated. That is, the control unit 800 distributes the work of the galvano scanner 200, the second X-axis moving unit 310, and the first Y-axis moving unit 320 from data such as a G code, and distributes the work to the distributed work.
  • a control signal for controlling the galvano scanner 200, the second X-axis moving unit 310, and the second Y-axis moving unit 320 may be generated.
  • the controller 800 may include an X-axis encoder (not shown) and a Y-axis encoder (not shown) to drive the second X-axis mover 310 and the second Y-axis mover 320. It may include.
  • the controller 800 controls the first moving unit 400 along the machining line derived according to the graphic file described above for CNC machining, and activates the machining unit 600 to surface the three-dimensional structure.
  • the controller 800 may move the machining part 600 outside the work area in which the metal powder surface is located by using the first moving part 400 during the operation of the galvano scanner 200 and the second moving part 300.
  • the first moving part 400 is controlled to form the three-dimensional structure of the machining part 600.
  • the machining unit 600 is activated to control to process the surface of the three-dimensional structure formed by sintering the metal powder.
  • the control unit 800 needs to irradiate a larger area than the scan area, the second X-axis moving unit 310 and the first X-axis moving unit 310. 2 Y-axis moving unit 320 is controlled so that the laser can be irradiated continuously between the scan areas.
  • the on-the-fly technology is a technology for processing a large area at high speed and high precision by interlocking a scanner and a two-axis stage.
  • the second moving unit 300 of the two axes is coupled to the galvano scanner 200 to control the control unit.
  • the control unit 800 calculates and outputs a control signal related to the on / off and processing information of the galvano scanner 400, the irradiation path in the scan area, and the moving path according to the driving of the moving unit.
  • the controller 800 interlocks the galvano scanner 200 and the second moving unit 300 so that the galvano scanner 200 and the second moving unit 300 share one information with each other. Do it.
  • the galvano scanner 200 may perform the sintering operation through continuous laser irradiation even for a very large area larger than the scan area.
  • control unit 800 divides the area B of the surface of the metal powder to generate a plurality of scan pages corresponding to the size of the scan area A, and irradiates with reference to the shape of the horizontal slicing file for each scan page. Paths and movement paths can be linked.
  • the controller 800 may store an error between the moving path of the galvano scanner 200 according to the control signal and the actual movement of the galvano scanner 200 which received the control signal in advance, and according to the stored error.
  • a correction command to correct the can be transmitted to the second moving unit (300).
  • the second moving unit 300 moves the galvano scanner 200 according to the correction value of the correction command.
  • the second moving unit 300 has an inertia in proportion to its mass and the mass of the galvano scanner 200, which may cause errors in the moving path. Accordingly, an inertia error correction value for measuring an actual movement path of the galvano scanner 200 by the second moving unit 300 and correcting an error generated by inertia in comparison with the movement path indicated by the control unit 800.
  • the pre-stored it is possible to more accurately control the movement path of the galvano scanner 200 according to the stored inertia error correction value.
  • the controller 800 must generate a driving command to move by 'a' at t0 in advance. Nevertheless, a control error occurs in the section between t0 and t1 due to the inertia of the galvano scanner 200 and the second moving unit 300. If the speed of the second moving unit 300 moving the galvano scanner 200 along the moving path is reduced, the control error is reduced, but the printing time through the sintering of the three-dimensional structure is increased.
  • the control error generated in the movement path of the second moving unit 300 may be corrected in the irradiation path of the galvano scanner 200. That is, since the driving command of the second moving unit 300 is executed in milliseconds (msec), and the galvano scanner 200 driving command is executed in microseconds ( ⁇ sec), the second moving unit 300 Error correction commands may be generated between driving command generation intervals and reflected in the galvano scanner 200 control command.
  • t0 and t1 have a stage unit 100 driving command execution interval of 1 msec, and a galvano scanner 200 driving command execution interval of 10 ⁇ sec, 99 error correction commands are generated between t0 and t1. It may be reflected in the command for controlling the irradiation path of the galvano scanner 200.
  • FIG. 2 is a view showing the inside of the galvano scanner 200 of the large-area laser scanner-based three-dimensional printing apparatus applying the machining according to the present invention, the galvano scanner 200 according to the present invention, the beam output unit ( 210, focus varying unit 220, x-axis mirror 230, x-axis motor 240, y-axis mirror 250, and y-axis motor 260 (other components such as beam splitters, etc. may be used for convenience). Not shown).
  • the control unit 300 shown in FIG. 1A obtains an irradiation path for the surface of the metal powder on the stage unit 100 from the cross-sectional data of the three-dimensional structure, thereby driving the beam output unit 210, and the focus variable unit 220.
  • a driving command, an x-axis motor 240, and a y-axis motor 260 driving command are generated and transmitted to the galvano scanner 200.
  • control unit 300 moves the galvano scanner 200 along the movement path according to the cross-sectional data of the three-dimensional structure, through which the metal powder on the stage unit 100 to which the laser of the galvano scanner 200 is irradiated Allow continuous sintering to be performed on the surface.
  • the controller 800 generates a correction command for correcting the error of the irradiation path and the moving path due to the inertia according to the mass of the galvano scanner 200 and the galvano scanner 200.
  • the correction values may be distributed to the X and Y axes, respectively. That is, the controller 800 reflects the X-axis and Y-axis correction commands to the control commands of the x-axis motor 240 and the y-axis motor 260, respectively. That is, two-axis correction is performed by the x-axis motor 240 and the y-axis motor 260.
  • the beam output unit 210 generates and outputs a laser beam.
  • a laser beam power regulator (not shown) may be added to the rear end of the beam output unit 210 to adjust and output the power of the laser beam.
  • the focus variable unit 220 may adjust the optical path of the laser beam emitted from the beam output unit 210 or adjust the focus of the laser beam.
  • the focus variable unit 220 is A separate mirror (not shown) may be provided, and the laser beam incident from the beam output unit 210 may be reflected to the x-axis mirror 230.
  • the focus variable part 220 adjusts the focus of the laser beam so that the focus of the laser beam is placed on the surface of the metal powder of the stage part 100 so that the metal powder can be sintered.
  • the x-axis mirror 230, the x-axis motor 240, the y-axis mirror 250 and the y-axis motor 260 the laser beam of the beam output unit 210 incident through the focus variable unit 220
  • the vertical displacement and the horizontal displacement of the laser light is reflected on the surface of the metal powder of the stage portion 100 in the form of a desired pattern.
  • FIG 3 is a view showing in detail the stage unit 100 of the large-area laser scanner-based three-dimensional printing apparatus applying the machining according to the present invention, the stage unit 100 according to the present invention, the storage unit 110, the base
  • the part 120 may include a sidewall part 130 and a scraper part 140.
  • the storage unit 110 stores the metal powder 500 and discharges the metal powder 500 to the scraper unit 140 under the control of the controller 800. At this time, the storage unit 110 is preferably supplied by the volume of the metal powder 500 corresponding to one layer having a thickness sintered to the surface in contact with the galvano scanner 200, for example, 0.05 ⁇ 250 ⁇ Metal powders with a volume of 250 mm can be supplied.
  • the base unit 120 provides a surface of the metal powder 500 that is in contact with the plane, that is, the galvano scanner 200, is supplied with the metal powder from the storage unit 110, and the Vertically movable by control.
  • the base 120 is 0.05 in the vertical direction. mm is lowered and the metal powder is applied to the base part 120 from the storage part 110 again.
  • the base 120 may maintain the absolute height of the surface of the metal powder 500 in contact with the galvano scanner 200 at a constant. In other words, the focus of the laser beam irradiated from the galvano scanner 200 by the base 120 may be precisely aligned on the surface of the metal powder 500.
  • the side wall portion 130 may define the area of the surface of the metal powder on the base portion 120 as a structure of the vertical wall in contact with the side of the base portion 120.
  • the side wall portion 130 may form a wall of a rectangular box structure having an area of 250 ⁇ 250 mm, and its vertical length may be mainly determined according to the height of the three-dimensional structure to be manufactured.
  • the scraper unit 140 may generate a thin layer by dispersing the metal powder 500 on the base unit 120 under the control of the controller 800. That is, the scraper unit 140 has openings in the upper and lower portions, receives the metal powder from the storage unit 110 through the upper opening, and discharges the metal powder onto the base unit 120 through the lower opening. By scraping the metal powder discharged through the lower end of the sidewall while moving in the horizontal direction 141, a thin layer having a uniform surface can be formed on the base portion 120.
  • Figure 4 is a view for explaining the operation of the large-area laser scanner-based three-dimensional printing apparatus applying the machining according to the present invention, with reference to Figures 1a to 4 based on a large area laser scanner applying the machining according to the present invention The operation of the 3D printing apparatus will be described below.
  • the storage unit 110 discharges a predetermined amount of the metal powder 500 stored under the control of the control unit 800 to the scraper unit 140.
  • the scraper unit 140 receives the metal powder from the storage unit 110 through the upper opening, discharges the metal powder onto the base unit 120 through the lower opening, and moves in the horizontal direction 141. By scraping the metal powder discharged through the bottom of the side wall, a thin layer having a uniform surface is formed on the base portion 120.
  • the controller 800 reads the movement speed of the laser irradiation point traveling along the path along the coordinates and the coordinates of the horizontal cross section for forming the three-dimensional structure through the G code, and the like, thereby working Distribution to generate a control signal specifying the irradiation path of the galvano scanner 200 and the moving path of the second moving unit 300.
  • the second moving unit 300 moves the galvano scanner 200 according to the moving path indicated by the control unit 800.
  • the second moving part 300 intends to manufacture a cup shape among three-dimensional structures, as shown in FIG. 3, the second moving part 300 is located above the predetermined scan area A ′′ shown in FIG. 4.
  • the scanner 200 may be moved.
  • the galvano scanner 200 irradiates the sintering laser along the cross section 501 of the three-dimensional structure under the control of the control unit 800 in the scan area A ′′.
  • the second moving unit 300 moves the movement indicated by the control unit 800.
  • the galvano scanner 200 is moved along the path, for example, the second moving unit 300 drives the second X-axis moving unit 310 under the control of the control unit 800 to perform the galvano scanner ( 200 may be moved on a predetermined scan area A ′′ onto another scan area A ′′ ′.
  • the controller 800 may include a three-dimensional structure between the scan areas A ′′, A ′′ ′. For continuity of the cross section 501 of the galvano scanner 200 and the second moving unit 300 may be synchronized in real time.
  • the control unit 800 the galvano scanner 200 by the second moving unit 300 in advance to correct the movement error according to the inertia during real-time synchronization of the galvano scanner 200 and the second moving unit 300.
  • the control unit 800 stores an inertia error correction value for correcting an error generated by inertia in comparison with the movement path indicated by the controller 800, and according to the stored inertia error correction value. It is possible to control the movement path of the 200 more accurately. Meanwhile, the irradiation path of the galvano scanner 200 may be corrected by reflecting the distance moved by the second moving unit 300 to the galvano scanner 200.
  • the storage unit 110 When the cross section 501 of the three-dimensional structure to be sintered in the plurality of scan areas A, A ', A ", and A"' is sintered through the above process, the storage unit 110, the control unit 800, etc.
  • the desired three-dimensional structure can be generated by returning to the process of discharging the predetermined amount of the metal powder 500 stored under the control of the back to the scraper 140 and repeating the above-described operation.
  • Figures 5a and 5f is a view for explaining the operation of the machining unit 600 of the large-area laser scanner-based three-dimensional printing apparatus applying the machining according to the present invention, with reference to Figures 1a to 5f, the present invention Referring to the operation of the machining unit 600 as follows.
  • the galvano scanner 200 sinters the cross section 501 of the three-dimensional structure several times at a thickness C corresponding to one layer of the metal powder at a time, a part of the three-dimensional structure having a predetermined thickness is completed.
  • the processing rod 610 of the machining part 600 is brought closer to the side of the three-dimensional structure in the metal powder 500 by the first moving part 400.
  • the processing rod 610 may play a role of reducing the roughness of the three-dimensional structure according to the micro-machining method, but is not limited thereto.
  • control unit 800 approaches the side of the portion of the three-dimensional structure having a predetermined thickness to form the machining surface 611 with the roughness according to the shape of the final three-dimensional structure. do.
  • the control unit 800 includes a moving body (not shown) for adjusting the angle of the machining unit 600 in the first moving unit 400, and controls the provided moving body to control the processing rod 610. It may be entered into the metal powder 500 at an angle.
  • the processing rod 610 may use various types of end mills as shown in FIGS. 5B to 5E according to shapes to be processed.
  • a flat end mill as shown in FIG. 5B may be used, and as shown in FIG. 5F, there is an undercut in the shape to be processed.
  • a spherical end mill as shown in FIG. 5E may be used.
  • a ball end mill as shown in FIG. 5D may be used.
  • a radial type end mill as shown in FIG. 5C may be used. Can be used.
  • 5F illustrates a form in which a three-dimensional structure having an undercut structure is formed by the galvano scanner 200 and the machining unit 600.
  • the galvano scanner 200 and the machining unit 600 are illustrated.
  • 3) to form a three-dimensional structure not only improves the roughness, but also can form a structure including an undercut shape, there is an advantage that can be used immediately without additional processes even when manufacturing a mold.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Laser Beam Processing (AREA)
  • Powder Metallurgy (AREA)

Abstract

La présente invention concerne un appareil d'impression tridimensionnelle de grande surface à base de scanner laser, auquel un usinage est appliqué, pour imprimer une structure en trois dimensions, l'appareil étant capable d'améliorer, par usinage, la rugosité d'une structure métallique tridimensionnelle formée par irradiation d'une poudre métallique avec un laser de manière à être frittée, et comprenant : une partie d'échelon permettant de recevoir la poudre métallique ; un scanner galvanométrique permettant d'exposer au rayonnement une région de balayage sur la surface de la poudre métallique avec un laser de frittage ; une partie d'usinage permettant d'usiner la surface latérale du métal fritté par le scanner galvanométrique ; une première partie mobile permettant de déplacer la partie d'usinage le long d'un axe X, d'un axe Y et d'un axe Z ; et une partie de commande permettant de commander un trajet d'irradiation du scanner galvanométrique, si la partie d'usinage est actionnée, et un premier trajet de déplacement de la première partie mobile selon une commande, dans un fichier de découpage horizontal, pour la structure tridimensionnelle.
PCT/KR2017/001579 2016-02-16 2017-02-14 Appareil d'impression tridimensionnelle de grande surface à base de scanner laser, auquel un usinage est appliqué WO2017142284A1 (fr)

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KR10-2016-0017964 2016-02-16
KR1020160017964A KR20170096504A (ko) 2016-02-16 2016-02-16 기계가공을 적용한 대면적용 레이저 스캐너 기반 3차원 프린팅 장치

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KR102012691B1 (ko) 2017-10-12 2019-08-21 한국기계연구원 레이저와 분말을 이용한 3차원 형상 제조방법
KR102300828B1 (ko) * 2019-10-25 2021-09-09 참엔지니어링(주) 선택적 레이저 소결을 이용한 듀얼 스캐너 3d프린터

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