A 3D printing device and its control method

Abstract

The present invention provides a 3D printing device and a control method thereof. The 3D printing device includes a droplet generator and a wire feeder. The wire feeder is adapted to simultaneously feed multiple metal wires to the droplet generator. The droplet generator includes a nozzle and an induction coil. The induction coil is sleeved outside the nozzle and is adapted to heat the nozzle. The nozzle is in a funnel shape. The larger opening of the nozzle is a feed port, and the diameter of the feed port is greater than or equal to the sum of the diameters of the multiple metal wires. The nozzle is adapted to heat the portions of the multiple metal wires extending into the nozzle into metal liquid. The technical solution of the present invention reduces the cost and danger of 3D printing using multiple metals and facilitates the control of the size of metal droplets.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and more particularly, to a 3D printing device and a control method thereof. Background Art

[0002] 3D printing technology is a technology that uses a mathematical model file as a basis, applies adhesives such as metals or plastics, and constructs objects by layer-by-layer printing.

[0003] At present, 3D printing with a single material has become increasingly mature, while there are still many difficulties in 3D printing with multiple metal materials. For example, in the prior art, selective laser cladding technology is often used for 3D printing of multiple metal materials, but the raw materials used are metal powders, which have high costs, high risks, and it is difficult to control the size of metal droplets. Summary of the Invention

[0004] The problem solved by the present invention is the problem of high cost, high risk, and difficulty in controlling the size of metal droplets when using metal powders for 3D printing of multiple metals in the prior art.

[0005] To solve the above problems, the present invention provides a 3D printing device and a control method thereof.

[0006] In a first aspect, a 3D printing device provided by the present invention includes a droplet generator and a wire feeder. The wire feeder is adapted to simultaneously feed multiple metal wires to the droplet generator. The droplet generator includes a nozzle and an induction coil. The induction coil is sleeved outside the nozzle and is adapted to heat the nozzle. The nozzle is in a funnel shape, and the larger opening of the nozzle is the feed port. The diameter of the feed port is greater than or equal to the sum of the diameters of the multiple metal wires. The nozzle is adapted to heat the part of the multiple metal wires extending into the nozzle into metal liquid.

[0007] Further, it further includes a three-dimensional moving platform. The droplet generator is installed on the three-dimensional moving platform, and the three-dimensional moving platform is adapted to drive the droplet generator to move.

[0008] Further, it further includes a controller and a driver. The controller is electrically connected to the induction coil through the driver, and the controller is electrically connected to the wire feeder.

[0009] Further, the wire feeder includes multiple wire feeding mechanisms. Each wire feeding mechanism is electrically connected to the controller respectively, and each wire feeding mechanism is adapted to feed one metal wire.

[0010] Further, the droplet generator further includes a graphite plate, on which an installation hole is formed, the nozzle is installed in the installation hole, the nozzle is made of graphite, and the nozzle is integrally formed with the graphite plate.

[0011] Further, the smaller-diameter opening of the nozzle is the material outlet. The droplet generating device further includes a heat-insulating bushing, one end of the heat-insulating bushing is open, the other end of the heat-insulating bushing is provided with a heat-insulating plate, the graphite plate is arranged inside the heat-insulating bushing, the induction coil is spirally wound around the outer wall of the heat-insulating bushing, a material outlet hole is formed on the heat-insulating plate, the material outlet hole is arranged opposite to the material outlet, and the diameter of the material outlet hole is greater than or equal to the diameter of the material outlet.

[0012] Further, the droplet generator further includes a temperature sensor, the measuring end of the temperature sensor abuts against the graphite plate or the nozzle, and the temperature sensor is adapted to detect the temperature of the nozzle.

[0013] Further, the droplet generator further includes a filling block, the filling block is arranged inside the heat-insulating bushing and is adapted to fill the internal space of the heat-insulating bushing, the graphite plate is arranged between the filling block and the heat-insulating plate, a plurality of wire inlet holes penetrating through the filling block are formed on the filling block, the plurality of wire inlet holes are respectively communicated with the nozzle, the wire inlet holes extend linearly, and each wire inlet hole is adapted for a metal wire to pass through.

[0014] Further, the filling block is made of quartz, and the diameter of the wire inlet hole is greater than or equal to the diameter of the metal wire.

[0015] Further, a support hole penetrating through the filling block is further formed on the filling block, the support hole extends linearly, and one end of the support hole faces the graphite plate or the nozzle, and the support hole is adapted for the temperature sensor to pass through.

[0016] In a second aspect, the present invention provides a 3D printing device control method, based on the 3D printing device as described above, including:

[0017] Inputting current to the induction coil to heat the nozzle of the 3D printing device to a calibrated temperature.

[0018] Respectively determining the wire feeding speeds of the respective metal wires according to a pre-determined metal mixing ratio, and controlling the wire feeders of the 3D printing device to respectively feed the respective metal wires into the nozzle at the corresponding wire feeding speeds, and the nozzle heats the portions of the respective metal wires extending into the nozzle into metal liquid.

[0019] When the molten metal flows out of the discharge port of the nozzle to form molten droplets, control the wire feeder to drive each of the metal wires to retract backward by a calibrated distance simultaneously, and the molten droplets drop onto the substrate to be printed.

[0020] Further, the 3D printing device includes a temperature sensor, the measuring end of the temperature sensor is in contact with the graphite plate or the nozzle, and inputting current to the induction coil to heat the nozzle of the 3D printing device to the calibrated temperature includes:

[0021] Obtain the real-time temperature of the nozzle collected by the temperature sensor, adjust the frequency of the current input to the induction coil according to the real-time temperature, and control the temperature of the nozzle to be stable at the calibrated temperature.

[0022] Further, the 3D printing device includes a three-dimensional moving platform, and the molten droplet generator of the 3D printing device is installed on the three-dimensional moving platform. The method further includes: driving the three-dimensional moving platform to move along a preset trajectory, controlling the molten droplets to drop onto each printing position of the substrate to be printed, and realizing 3D printing.

[0023] The beneficial effects of the 3D printing device and its control method of the present invention are as follows: The nozzle is funnel-shaped, the wide-mouth end of the nozzle is the feed port, and the narrow-mouth end is the discharge port. The ends of multiple metal wires conveyed by the wire feeder extend into the nozzle from the feed port. When contacting the inner wall of the nozzle, the induction coil heats the nozzle, and the nozzle heats the ends of the multiple metal wires in contact with the nozzle. Through heat transfer between the metal wires, the parts of all the metal wires extending into the nozzle are heated into molten metal. The wire feeder can convey each metal wire forward at different rates, and the metal wires are mixed in a specific proportion to obtain alloy molten liquid of multiple metals. The wire feeder continuously conveys the metal wires forward, extruding the alloy molten liquid to flow out of the discharge port to form molten droplets. Using metal wires as raw materials, heating multiple metal wires into alloy molten liquid during the printing process, compared with 3D printing using metal powder, has lower cost and higher safety. Moreover, only the ends of the metal wires in contact with the nozzle are heated into molten metal, and by adjusting the conveying speed of the metal wires, the generation speed of the molten metal can be controlled, which is convenient for controlling the size of the molten droplets. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a 3D printing device according to an embodiment of the present invention;

[0025] Figure 2 It is a schematic structural diagram of a molten droplet generator according to an embodiment of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the nozzle according to an embodiment of the present invention;

[0027] Figure 4Schematic diagram of the electrical connection of a 3D printing device according to an embodiment of the present invention;

[0028] Figure 5 Schematic flow chart of a control method for a 3D printing device according to an embodiment of the present invention;

[0029] Figure 6 Schematic diagram of the control process of the metal wire according to an embodiment of the present invention.

[0030] Explanation of reference numerals:

[0031] 10 - Droplet generator, 11 - Nozzle, 12 - Induction coil, 13 - Graphite plate, 14 - Heat insulation bushing, 15 - Heat insulation plate, 16 - Temperature sensor, 17 - Filling block, 20 - Wire feeder driver, 21 - Wire feeding mechanism, 22 - Metal wire, 30 - Three-dimensional moving platform, 40 - Controller, 50 - Driver, 111 - Conical cylinder, 112 - Discharge pipe. Detailed implementation manners

[0032] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of specific embodiments of the present invention will be given with reference to the accompanying drawings.

[0033] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0034] As Figures 1 to 3 shown, a 3D printing device provided by an embodiment of the present invention includes a droplet generator 10 and a wire feeder. The wire feeder is adapted to simultaneously feed a plurality of metal wires 22 to the droplet generator 10. The droplet generator 10 includes a nozzle 11 and an induction coil 12. The induction coil 12 is sleeved outside the nozzle 11 and is adapted to heat the nozzle 11. The nozzle 11 is in a funnel shape, and the opening with a larger diameter of the nozzle 11 is the feed port. The diameter of the feed port is greater than or equal to the sum of the diameters of the plurality of metal wires 22. The nozzle 11 is adapted to heat the part of the plurality of metal wires 22 extending into the nozzle 11 into metal liquid.

[0035] In this embodiment, the nozzle 11 is funnel-shaped. The wide end of the nozzle 11 is the feed port, and the narrow end is the discharge port. The ends of multiple metal wires 22 conveyed by the wire feeder extend into the nozzle 11 from the feed port. When contacting the inner wall of the nozzle 11, the induction coil 12 heats the nozzle 11, and the nozzle 11 heats the ends of the multiple metal wires 22 in contact with the nozzle 11. Through heat transfer between the metal wires 22, the parts of all the metal wires 22 extending into the nozzle 11 are heated into metal liquid. The wire feeder can convey each metal wire 22 forward at different rates, and each metal wire 22 is mixed in a specific proportion to obtain an alloy melt of multiple metals. The wire feeder continuously conveys the metal wires 22 forward, extruding the alloy melt to flow out of the discharge port to form molten droplets. Using the metal wires 22 as raw materials, heating the multiple metal wires 22 into an alloy melt during the printing process has lower costs and higher safety compared to 3D printing using metal powder. Moreover, only the ends of the metal wires 22 in contact with the nozzle 11 are heated into metal liquid. By adjusting the conveying speed of the metal wires 22, the generation speed of the metal liquid can be controlled, facilitating the control of the molten droplet size.

[0036] Specifically, the nozzle 11 includes a conical cylinder 111 and a discharge pipe 112. The narrow end of the conical cylinder 111 is fixedly connected to one end of the discharge pipe 112, and the conical cylinder 111 is in communication with the discharge pipe 112. The induction coil 12 is spirally wound around the outside of the nozzle 11. By passing an alternating current through the induction coil 12, the induction coil 12 generates an alternating magnetic field. The nozzle 11 and the metal wires 22 are arranged in the alternating magnetic field, and eddy currents will be generated inside, and the eddy currents generate heat to heat the nozzle 11 and the metal wires 22. The thermal conductivity and melting point of the nozzle 11 can be higher than those of the metal wires 22 respectively. The nozzle 11 is first heated to the calibrated temperature, and then the nozzle 11 heats the parts of all the metal wires 22 extending into the nozzle 11. The parts of each metal wire 22 extending into the nozzle 11 can be arranged to be closely attached together, and all the metal wires 22 are heated through heat transfer between the metal wires 22. Even if they are not closely attached together, they can also be heated through the eddy current effect and the metal liquid in the nozzle 11.

[0037] Preferably, it further includes a three-dimensional moving platform 30. The droplet generator 10 is installed on the three-dimensional moving platform 30, and the three-dimensional moving platform 30 is adapted to drive the droplet generator 10 to move.

[0038] Specifically, the three-dimensional moving platform 30 is adapted to drive the droplet generator 10 to move in three directions in three-dimensional space, so that the metal molten droplets are sprayed at the required positions, and finally the corresponding product is printed.

[0039] Preferably, as Figure 4As shown, it further includes a controller 40 and a driver 50. The controller 40 is electrically connected to the induction coil 12 through the driver 50, and the controller 40 is electrically connected to the wire feeder.

[0040] Preferably, the wire feeder includes a wire feeder driver 20 and a plurality of wire feeding mechanisms 21. Each wire feeding mechanism 21 is electrically connected to the output end of the wire feeder driver 20, and the input end of the wire feeder driver 20 is electrically connected to the output end of the controller 40. Each wire feeding mechanism 21 is adapted to convey a metal wire 22.

[0041] Specifically, the metal wire 22 needs to have a certain stiffness to be able to press forward the molten metal. Preferably, it is a metal material without ferromagnetic materials. The wire feeder driver 20 can drive each wire feeding mechanism 21 to convey the metal wire 22 at different speeds respectively.

[0042] Preferably, the droplet generator 10 further includes a graphite plate 13. An installation hole is formed on the graphite plate 13, and the nozzle 11 is installed in the installation hole. The nozzle 11 is made of graphite and is integrally formed with the graphite plate 13.

[0043] Specifically, the thermal conductivity of graphite is better than that of metal and its melting point is high. The nozzle 11 is installed in the graphite plate 13, and the graphite plate 13 can increase the eddy current effect and can accelerate the heating speed of the nozzle 11.

[0044] Preferably, the smaller opening of the nozzle 11 is the material outlet. The droplet generating device further includes a heat insulation bushing 14. One end of the heat insulation bushing 14 is open, and a heat insulation plate 15 is provided at the other end of the heat insulation bushing 14. The graphite plate 13 is arranged in the heat insulation bushing 14. The induction coil 12 is spirally wound around the outer wall of the heat insulation bushing 14. A material outlet hole is formed on the heat insulation plate 15, and the material outlet hole is arranged opposite to the material outlet. The diameter of the material outlet hole is greater than or equal to the diameter of the material outlet.

[0045] Specifically, the heat insulation bushing 14 can weaken the heat dissipation of the nozzle 11 and the graphite plate 13 to the air, reduce heat loss, and save energy and protect the environment.

[0046] Preferably, the droplet generator 10 further includes a temperature sensor 16. The measuring end of the temperature sensor 16 abuts against the graphite plate 13 or the nozzle 11, and the temperature sensor 16 is adapted to detect the temperature of the nozzle 11.

[0047] Specifically, the temperature sensor 16 can be a thermocouple, etc. Preferably, it is a thermocouple without ferromagnetic materials. By detecting the temperature of the nozzle 11 in real time through the temperature sensor 16, the frequency of the induction coil 12 can be adjusted in real time according to the detected temperature, and then the temperature of the nozzle 11 can be adjusted to keep the temperature of the nozzle 11 stable.

[0048] Preferably, the droplet generator 10 further includes a filling block 17 disposed within the heat-insulating bushing 14 and adapted to fill the internal space of the heat-insulating bushing 14. The graphite plate 13 is disposed between the filling block 17 and the heat-insulating plate 15. A plurality of material inlet holes penetrating through the filling block 17 are formed in the filling block 17, and the plurality of material inlet holes are respectively communicated with the nozzle 11. The material inlet holes extend linearly, and each material inlet hole is adapted for a wire 22 to pass through.

[0049] Preferably, the filling block 17 is made of quartz, and the diameter of the material inlet hole is greater than or equal to the diameter of the wire 22.

[0050] Specifically, the wire 22 passes through the material inlet hole and extends into the nozzle 11. The material inlet hole extends linearly to restrict the conveying route of the wire 22, which can prevent the wire 22 from bending or deflecting, thereby affecting the generation of metal droplets.

[0051] Preferably, a support hole penetrating through the filling block 17 is further formed in the filling block 17. The support hole extends linearly, and one end of the support hole faces the graphite plate 13 or the nozzle 11. The support hole is adapted for the temperature sensor 16 to pass through.

[0052] Specifically, the measuring end of the temperature sensor 16 passes through the support hole and abuts against the graphite plate 13 or the nozzle 11. The filling block 17 supports the temperature sensor 16, which is simple and convenient.

[0053] As Figure 5 and Figure 6 shown, a 3D printing device control method provided by an embodiment of the present invention, based on the 3D printing device as described above, includes:

[0054] Step 100: Input a current into the induction coil 12 to heat the nozzle 11 of the 3D printing device to a calibration temperature.

[0055] Specifically, the control driver 50 inputs a current into the induction coil 12. The calibration temperature is slightly higher than the melting point of the wire 22. When there are multiple different types of wires 22, the calibration temperature is slightly higher than the highest melting point among the melting points of the respective wires 22.

[0056] The 3D printing device includes a temperature sensor 16. The measuring end of the temperature sensor 16 abuts against the graphite plate 13 or the nozzle 11. After the nozzle 11 is first heated to the calibration temperature, the real-time temperature of the nozzle 11 collected by the temperature sensor 16 is obtained, and the frequency of the current input into the induction coil 12 is adjusted according to the real-time temperature to control the temperature of the nozzle 11 to be stable at the calibration temperature.

[0057] Step 200: Determine the wire feeding speeds of the respective metal wires 22 according to a pre-determined metal mixing ratio, and control the wire feeders of the 3D printing device to feed the respective metal wires 22 into the nozzle 11 at the corresponding wire feeding speeds. The nozzle 11 heats the portions of the respective metal wires 22 extending into the nozzle 11 into metal liquid.

[0058] Specifically, the metal mixing ratio is the ratio of various metals in the alloy to be generated. As Figure 6 (a) shows, first, control each wire feeding mechanism 21 to feed the corresponding metal wire 22 to the inlet of the nozzle 11 respectively, that is, the end of each metal wire 22 reaches the inlet of the nozzle 11. Then, control each wire feeding mechanism 21 to feed the respective metal wires 22 into the nozzle 11 at the corresponding wire feeding speeds. The nozzle 11 heats the portions of the respective metal wires 22 extending into the nozzle 11 into metal liquid, and this metal liquid is the alloy metal liquid.

[0059] Step 300: When the metal liquid flows out of the outlet of the nozzle 11 to form a molten droplet, control the wire feeders to drive the respective metal wires 22 to retract backward by a calibrated distance simultaneously, and the molten droplet drops onto the substrate to be printed.

[0060] Specifically, as Figure 6 (b) shows, when continuously feeding the metal wire 22 into the conical cylinder 111 of the nozzle 11, the metal wire 22 extrudes the metal liquid, and the metal liquid flows through the outlet pipe 112 and finally flows out of the outlet to form a molten droplet. As Figure 6 (c) shows, at this time, control each wire feeding mechanism 21 to drive the corresponding metal wire 22 to retract backward by a calibrated distance simultaneously. The pressure between the metal wire 22 and the metal liquid instantaneously becomes smaller. Before the surface tension between the molten droplet and the metal liquid returns to normal, the molten droplet separates from the metal liquid. Among them, the calibrated temperature reached by the nozzle 11 after heating is slightly higher than the melting point of the metal wire 22. The portion of the metal wire 22 extending into the nozzle 11 will melt first, and other parts are close to melting. By controlling the oscillation frequency of the metal wire 22 back and forth, the metal wire 22 can be driven to retract before other parts melt, avoiding excessive melting of the metal wire 22 and affecting the printing effect. As Figure 6 (d) shows, the molten droplet drops onto the substrate to be printed.

[0061] In this embodiment, melting multiple metal wires 22 into alloy metal liquid can print products made of composite metal materials. Using the nozzle 11 to heat only the portion of the metal wire 22 extending into it into metal liquid facilitates controlling the generation speed of the molten droplet. And by controlling the metal wire 22 to perform high-frequency oscillating motion with the wire feeder, the size of the molten droplet can be controlled, improving the printing accuracy. Compared with 3D printing using metal powder, it has higher safety and lower cost.

[0062] Preferably, the 3D printing device includes a three-dimensional moving platform 30, and a droplet generator 10 of the 3D printing device is installed on the three-dimensional moving platform 30. The method further includes: driving the three-dimensional moving platform 30 to move along a preset trajectory, and controlling the droplets to drop onto each printing position of the substrate to be printed, so as to realize 3D printing.

[0063] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Without departing from the spirit and scope of the present invention, those skilled in the art can make various changes and modifications, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A method for controlling a 3D printing device, characterized in that, Based on a 3D printing device, the 3D printing device includes a droplet generator (10) and a wire feeder. The wire feeder is adapted to simultaneously feed multiple metal wires (22) to the droplet generator (10). The droplet generator (10) includes a nozzle (11) and an induction coil (12). The induction coil (12) is sleeved outside the nozzle (11) and is adapted to heat the nozzle (11). The nozzle (11) is funnel-shaped. The larger opening of the nozzle (11) is the feed port, and the diameter of the feed port is greater than or equal to the sum of the diameters of the multiple metal wires (22). The nozzle (11) is adapted to heat the portions of the multiple metal wires (22) extending into the nozzle (11) into metal liquid; The control method of the 3D printing device includes: Inputting current to the induction coil (12) to heat the nozzle (11) of the 3D printing device to a calibrated temperature; Determining the wire feeding speeds of the respective metal wires (22) according to a pre-determined metal mixing ratio, and controlling the wire feeder of the 3D printing device to feed the respective metal wires (22) into the nozzle (11) at the corresponding wire feeding speeds. The nozzle (11) heats the portions of the respective metal wires (22) extending into the nozzle (11) into metal liquid; When the metal liquid flows out of the discharge port of the nozzle (11) to form droplets, controlling the wire feeder to respectively drive the respective metal wires (22) to simultaneously retract backward by a calibrated distance, and the droplets drop onto the substrate to be printed.

2. The 3D printing device control method according to claim 1, characterized in that It further includes a three-dimensional moving platform (30). The droplet generator (10) is installed on the three-dimensional moving platform (30), and the three-dimensional moving platform (30) is adapted to drive the droplet generator (10) to move.

3. The 3D printing device control method according to claim 2, wherein It further includes a controller (40) and a driver (50). The controller (40) is electrically connected to the induction coil (12) through the driver (50). The wire feeder includes multiple wire feeding mechanisms (21). The controller (40) is respectively electrically connected to each wire feeding mechanism (21), and each wire feeding mechanism (21) is adapted to feed one metal wire (22).

4. The 3D printing device control method according to claim 1, wherein, The droplet generator (10) further includes a graphite plate (13). The graphite plate (13) is provided with a mounting hole, and the nozzle (11) is installed in the mounting hole. The nozzle (11) is made of graphite and is integrally formed with the graphite plate (13).

5. The 3D printing device control method according to claim 4, characterized in that, The smaller opening of the nozzle (11) is the discharge port. The droplet generating device further includes a heat insulation bushing (14). One end of the heat insulation bushing (14) is open, and the other end of the heat insulation bushing (14) is provided with a heat insulation plate (15). The graphite plate (13) is arranged in the heat insulation bushing (14). The induction coil (12) is spirally wound around the outer wall of the heat insulation bushing (14). The heat insulation plate (15) is provided with a discharge hole, and the discharge hole is arranged opposite to the discharge port. The diameter of the discharge hole is greater than or equal to the diameter of the discharge port.

6. The 3D printing device control method according to claim 5, wherein The droplet generator (10) further includes a temperature sensor (16). The measuring end of the temperature sensor (16) abuts against the graphite plate (13) or the nozzle (11), and the temperature sensor (16) is adapted to detect the temperature of the nozzle (11).

7. The 3D printing device control method according to claim 6, wherein The droplet generator (10) further includes a filling block (17). The filling block (17) is disposed within the heat insulation bushing (14) and is adapted to fill the internal space of the heat insulation bushing (14). The graphite plate (13) is disposed between the filling block (17) and the heat insulation plate (15). A plurality of material inlet holes penetrating the filling block (17) and support holes penetrating the filling block (17) are formed in the filling block (17). The material inlet holes and the support holes extend linearly respectively. The plurality of material inlet holes communicate with the nozzle (11) respectively. Each material inlet hole is adapted for a metal wire (22) to pass through. One end of the support hole faces the graphite plate (13) or the nozzle (11), and the support hole is adapted for the temperature sensor (16) to pass through.

8. The 3D printing device control method according to claim 1, wherein The 3D printing device includes a temperature sensor (16). The measuring end of the temperature sensor (16) abuts against the nozzle (11). Inputting current to the induction coil (12) to heat the nozzle (11) of the 3D printing device to the calibration temperature includes: Obtaining the real-time temperature of the nozzle (11) collected by the temperature sensor (16), adjusting the frequency of the current input to the induction coil (12) according to the real-time temperature, and controlling the temperature of the nozzle (11) to be stable at the calibration temperature.

9. The 3D printing device control method according to claim 1 or 8, characterized in that The 3D printing device includes a three-dimensional moving platform (30). The droplet generator (10) of the 3D printing device is installed on the three-dimensional moving platform (30). The method further includes: driving the three-dimensional moving platform (30) to move along a preset trajectory, controlling the droplets to drop onto each printing position of the substrate to be printed, and completing 3D printing.

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