Laser-assisted enhanced fused deposition device and forming method

Abstract

The invention relates to a laser-assisted enhanced fused deposition device and a forming method, and belongs to the field of additive manufacturing. According to the device, after molten materials are extruded by the spray head to form a deposition layer, the deposition layer is heated by using a laser beam, so that the deposition layer reaches a glass-transition temperature, and fusion of two adjacent layers is enhanced. The device comprises a laser generator, a controller, a clamp, a laser head, a nozzle mounting plate, a nozzle, a wire feeding mechanism and a movement mechanism. The sprayer comprises a heat dissipation mechanism, a heating structure and a nozzle. The laser head is connected with the nozzle through the clamp, and the movement mechanism drives the nozzle and the laser head to synchronously move along a preset path. According to the method, a deposition layer is heated through laser irradiation, so that the deposition layer and a previous deposited layer are subjected to secondary fusion, and through deposition-laser irradiation-deposition reciprocating circulation, the interlayer bonding strength is enhanced, and layer lines are reduced. The device solves the problem of poor interlayer bonding strength in the traditional FDM technology, and has the advantages of simple structure, high adaptability, wide application range and the like.

Description

Technical Field

[0001] The present invention belongs to the field of additive manufacturing, and relates to a laser-assisted enhanced fused deposition device and a forming method. Background Art

[0002] The idea of additive manufacturing technology germinated in the late 19th century. Subsequently, a variety of key technologies emerged. From prototype machines to commercialization, as the technology matured, its application fields continued to expand. Nowadays, it plays an important role in multiple industries, and the material library used continues to expand, including polymers, metals, ceramics, and composite materials. Currently, the most popular among various additive manufacturing processes is the fused deposition modeling (FDM) technology. The materials for fused deposition modeling are generally thermoplastic materials, such as wax, ABS, nylon, etc. FDM uses filament feeding. The material is heated and melted in the nozzle, and the nozzle moves along a predetermined trajectory while extruding the melted material. The material quickly solidifies, and forming is achieved through layer-by-layer stacking. The FDM technology has low requirements for the use environment, and the entire printing process is relatively environmentally friendly. However, since the fused deposition modeling technology forms by layer-by-layer stacking, the surface of the printed workpiece usually has obvious layer lines, especially with poor strength perpendicular to the forming direction. The integrity and mechanical strength of the manufactured part largely depend on the bonding quality between subsequent layers, and this problem restricts the development of the FDM technology. In order to enhance the interlayer bonding strength, a variety of methods have been proposed in the prior art, such as improving the printing temperature, increasing the printing speed, optimizing the nozzle design, using adhesives, and post-treatment processes and other improvement measures. However, these methods all have certain complexities and limitations.

[0003] Compared with the above-mentioned prior art, the present invention proposes a laser-assisted enhanced fused deposition device and forming method, which is a new forming process combining traditional fused deposition modeling (FDM) and laser-assisted heating technology. This method uses laser irradiation to heat the deposited layer on the already printed deposition layer, so that the already printed deposition layer reaches the glass state again to enhance its fusion with the previous deposition layer. Through the deposition-laser irradiation-deposition cyclic printing, the interlayer bonding strength is enhanced, the layer lines phenomenon is effectively reduced, and the density and mechanical properties of the printed parts are improved. The core advantage of the present invention lies in the laser-assisted heating treatment of the deposited layer of thermoplastic materials to make it reach the glass state again to enhance the interlayer fusion, which is significantly different from most similar patents. Most existing patents such as CN106926447A, CN106975750A, CN107856298A, CN109159421B, CN110773870A, CN115383138A, CN207028180U, etc. mainly focus on optimizing the process of melting the material before depositing the printing layer or improving the wire feeding and melting stage to prevent problems such as print head clogging. In addition, the difference between the present invention and CN111730860A is that in CN111730860A, the laser action is to irradiate the printed material deposition layer to make it into a semi-molten state so as to better combine with the next layer of material, while the present invention performs laser heating treatment on the deposited layer after printing to perform secondary fusion with the already deposited upper layer, thereby significantly improving the interlayer bonding strength and printing quality, and the structure of the device of CN111730860A for the incremental and subtractive processing of composite profiles is significantly different from that of the present invention. On the other hand, the present invention is applicable to the printing of a variety of thermoplastic materials, with strong versatility, especially suitable for scenarios with high requirements for the interlayer bonding strength of printed parts. Similar patents in this field such as CN106944622A and CN110977172A are mainly used for the high-performance forming of metal materials, and CN115383138A mainly aims at the problem of time-consuming and labor-consuming material replacement during the multi-material forming process, and the mechanical structure is complex and the cost is expensive.

[0004] The present invention not only effectively solves the problem of poor interlayer bonding strength in the traditional FDM technology. Moreover, the device structure of the present invention is simple, easy to implement and apply, and by adjusting the laser parameters, it can adapt to the processing characteristics of different thermoplastic materials, further expanding the application field of this technology. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem of poor bonding strength between layers in the vertical processing direction of fused deposition modeling. To overcome this technical problem, a laser-assisted enhanced fused deposition device and forming method are provided.

[0006] To achieve the above object, the present invention adopts the following technical solutions to be realized: A laser-assisted enhanced fused deposition modeling device, comprising: a laser generator, a controller, a fixture, a laser head, a nozzle mounting plate, a nozzle, a substrate, a printing platform, a wire feeding mechanism, and a motion mechanism.

[0007] The nozzle described in the present invention includes: a heat dissipation mechanism, a heating structure, and a nozzle.

[0008] In the present invention, the controller and the laser head are fixed on the nozzle through a fixture to realize the synchronous movement of the laser head and the nozzle; the action range of the laser beam emitted by the laser head is the deposition layer.

[0009] One end of the wire in the present invention is connected to the wire feeding mechanism, and the other end is connected to the nozzle located inside the heating mechanism.

[0010] The power of the laser generator in the present invention uses a low-power laser. The energy provided by the laser generator is the key to realizing interlayer fusion, which directly determines the mechanical properties and surface quality of the printed part. By adjusting the laser parameters, the laser generator can adapt to the processing requirements of different materials, making the present invention have a wider application range.

[0011] The nozzle mounting plate described in the present invention includes: a rear nozzle mounting plate, a front nozzle mounting plate, and a nozzle fixer. The rear nozzle mounting plate and the front nozzle mounting plate are connected by bolts, and the connection position is the rear plate connection hole. The nozzle is connected to the motion mechanism of the FDM printer through the optical axis connection hole and the synchronous belt connection hole between the rear nozzle mounting plate and the front nozzle mounting plate. The front nozzle mounting plate and the nozzle fixer are also connected by bolts, and the connection position is the front plate connection hole. The connection between the front nozzle mounting plate and the nozzle fixer provides stable fixation and mechanical support for the nozzle. The overall structure of the nozzle mounting plate ensures that the nozzle can move precisely along a predetermined path during printing.

[0012] Furthermore, the controller is fixed above the laser head by bolt connection, and the connection position is the bolt hole on the controller. At the same time, the controller realizes the control of the laser head through the laser generator connection wire and the laser head connection wire, and realizes the generation and generation time of the controller controlling the laser beam to meet the requirements of laser-assisted fused deposition under different paths. Among them, the laser generator connection wire realizes the line connection between the controller and the laser generator, and the laser head connection wire realizes the line connection between the controller and the laser head.

[0013] Furthermore, a fixture is provided. The fixture is made of an alloy material with a certain strength or other materials with good heat resistance and high strength, and includes: fixture bolt holes, a nozzle clamping position, and a laser head clamping position. One end of the fixture precisely clamps the laser head through the laser head clamping position, and the other end clamps the nozzle mounting plate through the nozzle clamping position, thereby precisely clamping the nozzle. By tightening bolts at the fixture bolt holes, the laser head and the nozzle are firmly fixed in the middle position. This design not only saves space but also ensures that the laser head and the nozzle can maintain a synchronous connection, thereby realizing the precise collaborative work of the two during the laser-assisted enhanced fused deposition molding process.

[0014] Furthermore, the motion mechanism drives the laser head, and through displacement compensation, the starting point of the laser irradiation is made to exactly correspond to the starting point of the deposition layer.

[0015] On the other hand, a molding method of a laser-assisted enhanced fused deposition device according to the present invention includes the following steps: S1: The wire material is conveyed by a wire feeding mechanism into the nozzle inside the heating mechanism; S2: The wire material in the nozzle is heated by the heating mechanism until the wire material melts to obtain a wire material melt; S3: The motion mechanism drives the nozzle to move a distance XA along the X direction under a preset path, and the wire material melt is extruded onto the substrate through the nozzle to complete the first deposition layer, and the printing platform moves down a preset distance ZA along the Z direction; S4: The motion mechanism drives the nozzle to move a distance XA along the -X direction to return the nozzle to the starting point; S5: The motion mechanism drives the nozzle to move along the X direction under a preset path, and the wire material melt 10 is extruded onto the first deposition layer through the nozzle to complete the second deposition layer, and the printing platform moves down a preset distance ZA along the Z direction; S6: The motion mechanism continues to drive the nozzle to move a distance XA + △X along the -X direction, and through the displacement compensation amount + △X, the laser head is aligned with the starting point of the second deposition layer; S7: The motion mechanism drives the laser head to move a distance XA along the X direction under a preset path, and the controller controls the laser head to emit a laser beam to irradiate the second deposition layer. The second deposition layer is heated and melted to the glass transition temperature under the laser irradiation, and the second deposition layer in the viscous flow state further fuses with the first deposition layer; S8: The motion mechanism drives the nozzle to move a distance XA - △X along the -X direction under a preset path to return the nozzle to the starting point again; S9: Repeat steps S5, S6, S7, and S8 until the printing is completed.

[0016] Compared with the prior art, the present invention has the following beneficial effects: By connecting the laser head to the nozzle, after the nozzle extrudes the molten filament to form a deposition layer, the laser head repeats the upper path and irradiates the deposition layer, heating the deposition layer to the glass transition temperature, that is, the heated deposition layer is in a vitreous state and exhibits viscous flow properties, so that it can be further fused with the previous deposition layer. Then, the nozzle deposits the next layer on the further fused deposition layer. Since the solidified deposition layer is in a viscous flow state after being irradiated by the laser, it can be better bonded to the previous deposition layer. Thus, by repeatedly irradiating and heating the deposition layer with the laser, a better interfacial bond is generated between layers, enhancing the bonding quality between the printed layer and the previous layer, and solving the problem of poor bonding strength between layers in the vertical processing direction of fused deposition modeling. The device structure of the present invention is simple, easy to implement and apply, and greatly promotes the development of FDM technology.

[0017] In the method of the present invention, by irradiating and heating the current deposition layer with a laser, the current deposition layer is further fused with the previous deposition layer, and then the next layer is deposited, enabling better fusion of the materials between layers, reducing the appearance of layer lines, enhancing the bonding strength between adjacent layers, improving the density of the printed part, better resisting interlayer separation and damage, and to a certain extent improving anisotropy, making the performance of the printed part more uniform in all aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the device of the present invention; Figure 2 is a perspective view of the nozzle of the present invention; Figure 3 is a perspective structural schematic diagram of the nozzle and the laser head of the present invention; Figure 4 is a perspective view of the nozzle mounting plate of the present invention; Figure 5 is an exploded view of the nozzle mounting plate of the present invention; Figure 6 is a perspective view of the fixture of the present invention.

[0019] Wherein: 1 - laser generator; 2 - controller; 3 - fixture; 4 - laser head; 5 - laser beam; 6 - filament; 7 - wire feeding mechanism; 8 - nozzle mounting plate; 9 - nozzle; 10 - filament melt; 11 - deposition layer; 12 - substrate; 13 - printing platform; 14 - heat dissipation mechanism; 15 - heating mechanism; 16 - nozzle; 17 - rear nozzle mounting plate; 18 - front nozzle mounting plate; 19 - nozzle holder; 20 - controller bolt hole; 21 - laser generator connection line; 22 - laser head connection line; 23 - front plate connection hole; 24 - rear plate connection hole; 25 - optical axis connection hole; 26 - synchronous belt connection hole; 27 - fixture bolt hole; 28 - nozzle clamping position; 29 - laser head clamping position. DETAILED DESCRIPTION OF THE INVENTION

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] The following further describes the present invention in detail in conjunction with the accompanying drawings: See Figures 1 to 6 , the laser-assisted fused deposition modeling device of the present invention includes: a laser generator 1, a controller 2, a fixture 3, a laser head 4, a nozzle mounting plate 8, a nozzle 9, a wire feeding mechanism 7 and a motion mechanism.

[0022] Among them, the controller 2 is connected to and controls the laser head 4 through the controller bolt hole 20 and the laser head connection wire 22, and also controls the laser generator 1 through the laser generator connection wire 21; the fixture 3 includes: a fixture bolt hole 27, a nozzle clamping position 28, and a laser head clamping position 29; the nozzle mounting plate 8 includes: a nozzle mounting rear plate 17, a nozzle mounting front plate 18, a nozzle fixer 19, a front plate connection hole 23, a rear plate connection hole 24, an optical axis connection hole 25, and a timing belt connection hole 26; the nozzle 9 includes: a heat dissipation mechanism 14, a heating mechanism 15, and a nozzle 16.

[0023] Refer to Figure 1 , Figure 2 and Figure 3 , one end of the wire 6 is connected to the wire feeding mechanism 7, and the other end extends to the nozzle 16 inside the heating mechanism 15. The wire 6 is heated to a molten state by the heating mechanism 15 to form a wire melt 10, which is extruded from the nozzle 16 and deposited on the substrate 12 to form a deposition layer 11. The substrate 12 is located directly below the nozzle 16 and is used to receive the deposition layer 11. The laser head 4 is connected to the nozzle 9 through the fixture 3 and is used to generate a laser beam 5, and the laser irradiation range covers the deposition layer 11 on the substrate 12, and the bonding strength between layers is enhanced by the thermal effect of the laser. Among them, in the nozzle 9, the heat dissipation mechanism 14 is used to dissipate heat from the heating mechanism 15 to ensure temperature control during the printing process; the printing platform 13 is used to support the substrate 12 and can be lifted along the Z-axis direction according to the printing requirements to achieve layer-by-layer printing; the controller 2 is fixed above the laser head 4 through the controller bolt hole 20 and realizes precise control of the laser generator 1 and the laser head 4 through the laser generator connection wire 21 and the laser head connection wire 22, and adjusts the power and emission time of the laser beam to meet the requirements of laser-assisted fused deposition under different printing paths.

[0024] Refer toFigure 3 , Figure 4 and Figure 5 , the nozzle mounting plate 8 is composed of a nozzle mounting rear plate 17, a nozzle mounting front plate 18, and a nozzle holder 19. Among them, the nozzle mounting front plate 18 and the nozzle holder 19 are connected by bolts through the front plate connection holes 23, so that the nozzle 9 can be stably fixed and installed inside, providing mechanical support for the nozzle 9; the connection part between the nozzle mounting rear plate 17 and the nozzle mounting front plate 18 adopts a symmetric structure, and the two are connected by bolts through the rear plate connection holes 24 to form a light axis connection hole 25 and a timing belt connection hole 26, realizing the connection between the nozzle 9 and the light axis and the timing belt system in the motion mechanism. Among them, the timing belt system drives the nozzle to move in the X direction, while the light axis provides guiding and supporting functions for the movement of the nozzle 9, ensuring that the nozzle 9 can accurately move along the predetermined path in the X-axis direction during the printing process. In addition, the nozzle mounting front plate 18 is an integrally formed structure.

[0025] Reference Figure 6 , the fixture 3 is made of an alloy material with a certain strength or other materials with good heat resistance and high strength, and includes: a fixture bolt hole 27, a nozzle clamping position 28, and a laser head clamping position 29. Among them, one end of the fixture 3 is provided with a laser head clamping position 29 for accurately clamping the laser head 4; the other end is provided with a nozzle clamping position 28 for clamping the nozzle mounting plate 8, and further accurately fixing the nozzle 9. By tightening the bolts in the fixture bolt hole 27, the laser head 4 and the nozzle 9 can be firmly fixed in the middle position. This design not only saves space but also ensures that the laser head 4 and the nozzle 9 can maintain synchronous connection, realizing the precise collaborative work of the two during the laser-assisted fused deposition forming process.

[0026] On the other hand, a forming method of a laser-assisted enhanced fused deposition device of the present invention is as follows: 1. The nozzle 9 moves a distance XA in the X direction. During the movement, the wire melt 10 is extruded and coated onto the substrate 12, and the material cools and solidifies to complete the first layer deposition. The printing platform 13 moves downward a distance ZA along the Z axis.

[0027] 2. The nozzle 9 moves a distance XA in the -X direction and returns to the initial position.

[0028] 3. The nozzle 9 moves a distance XA in the X direction. During the movement, the wire melt 10 is extruded and coated onto the first layer deposition layer to complete the second layer deposition. The printing platform 13 moves downward a distance ZA along the Z axis.

[0029] 4. The nozzle 9 moves a distance XA + △X in the -X direction and returns to the initial position. Through the displacement compensation amount + △X, the laser head 4 is aligned with the starting point of the second layer deposition layer.

[0030] 5. The nozzle 9 drives the laser head 4 to move synchronously along the X direction, that is, the laser head 4 moves a distance XA along the X direction. During the movement, the laser head 4 irradiates the laser to heat the second deposited layer that has cooled and solidified to the glass state, so that the second deposited layer and the first deposited layer are further fused.

[0031] 6. The laser head 4 moves a distance XA - △X along the -X direction to return to the initial position. Through the displacement compensation amount -△X, the nozzle 9 is aligned with the starting point of the deposited layer.

[0032] 7. The nozzle 9 moves a distance XA along the X direction. During the movement, the melt of the wire material is extruded and coated on the second deposited layer heated by the laser to complete the deposition of the third layer. The printing platform 13 moves downward a distance ZA along the Z axis.

[0033] 8. The nozzle 9 moves a distance XA + △X along the -X direction to return to the initial position. Through the displacement compensation amount +△X, the laser head 4 is aligned with the starting point of the third deposited layer.

[0034] 9. The nozzle 9 drives the laser head 4 to move synchronously along the X direction, that is, the laser head 4 moves a distance XA along the X direction. During the movement, the laser head 4 irradiates the laser to heat the third deposited layer that has been solidified to the glass state, so that the third deposited layer and the second deposited layer are further fused.

[0035] 10. The nozzle 9 moves a distance XA along the X direction. During the movement, the melt of the wire material is extruded and coated on the Nth deposited layer heated by the laser to complete the deposition of the N + 1th layer. The printing platform 13 moves downward a distance ZA along the Z axis.

[0036] 11. The nozzle 9 moves a distance XA + △X along the -X direction to return to the initial position. Through the displacement compensation amount +△X, the laser head 4 is aligned with the starting point of the N + 1th deposited layer.

[0037] 12. The nozzle 9 drives the laser head 4 to move along its path, that is, the laser head 4 moves a distance XA along the X direction. During the movement, the laser head 4 irradiates the laser to heat the N + 1th deposited layer that has been solidified to the glass state, so that the N + 1th deposited layer and the Nth deposited layer are further fused.

[0038] 13. By analogy, repeat steps 10, 11, and 12 for laser-assisted fused deposition until the fused deposition forming is completed. In addition, the specific processing path can be flexibly determined according to the actual situation; the moving modes and moving distances of the nozzle 9, the laser head 4, and the printing platform 13 along the X, Y, and Z directions are determined according to the actual equipment and processing conditions; the laser wavelength, power, spot diameter, irradiation speed, and other laser processing parameters are determined according to the processing materials.

[0039] The principle of the present invention is described in detail below: Traditional FDM additive manufacturing method: The wire 6 is conveyed from the consumable rack to the heating mechanism 15 of the print head 9 by the wire feeding mechanism 7, melted into a liquid state at high temperature, and then the liquid material is extruded through the nozzle 16 of the print head 9 to form a filamentous shape, and is deposited layer by layer on the print platform 13. After each layer of printing is completed, the substrate 12 will move downward according to the set layer height or the print head 9 will move upward a certain distance to facilitate the printing of the lower layer. This process is repeated until the entire model is printed.

[0040] Referring to the above method: In the present invention, the laser head 4 is connected to the print head 9 through the fixture 3. The print head 9 is connected to the motion mechanism through the print head mounting plate 8, so as to realize the synchronous movement of the motion mechanism driving the print head 9 and the laser head 4. When each layer of printing by the print head 9 is completed, the motion mechanism is controlled to drive the laser head 4 to repeat the motion path of the upper layer print head 9, realizing laser-assisted melting deposition. The deposited layer is heated and melted to the glass transition temperature under the laser irradiation and is in a viscous flow state, so as to further fuse with the upper deposited layer. The motion mechanism continues to drive the print head 9 to move along the preset path, and the print head 9 continues to extrude the wire melt 10 onto the surface of the deposited layer that has undergone secondary fusion, making the bonding between layers closer, thereby improving the bonding strength between layers. Solve the problem of poor bonding strength between layers in the vertical processing direction of fused deposition modeling.

[0041] Therefore, the present invention adopts a laser-assisted enhanced fused deposition device and forming method, which effectively improves the interlayer bonding strength of the printed part. In the method of the present invention, the deposited layer is heated by laser irradiation to make the printed deposited layer reach the glass state again to enhance its fusion with the upper deposited layer, enhancing the bonding between adjacent layers, improving the bonding strength between adjacent layers, better resisting the separation and damage between layers, and reducing the appearance of layer lines, improving the density of the printed part. The present invention solves the problem of poor interlayer bonding strength in the traditional FDM technology, and has the advantages of simple structure, strong adaptability, wide application range, etc.

[0042] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A laser-assisted enhanced molten deposition device, characterized in that: include: A laser generator (1), a controller (2), a fixture (3), a laser head (4), a nozzle mounting plate (8), a nozzle (9), a wire feeding mechanism (7), a motion mechanism, a substrate (12), and a printing platform (13); The nozzle (9) comprises a heat dissipation mechanism (14), a heating mechanism (15) and a nozzle (16); The nozzle mounting plate (8) comprises a nozzle mounting rear plate (17), a nozzle mounting front plate (18) and a nozzle holder (19); One end of the wire (6) is connected to the wire feeding mechanism (7), and the other end extends into the nozzle (16) inside the heating mechanism (15); the substrate (12) is located below the nozzle (16); the laser head (4) is fixedly connected to the nozzle (9) through the clamp (3); the controller (2) is electrically connected to the laser head (4); the motion mechanism drives the nozzle (9) and the laser head (4) to move synchronously along a preset path through the optical axis connection hole (25) and the synchronous belt connection hole (26) in the nozzle mounting plate (8).

2. The laser-assisted enhanced molten deposition device according to claim 1, characterized in that: The controller (2) is fixed above the laser head (4) through the controller bolt hole (20), and controls the laser generator (1) and the laser head (4) through the laser generator connection line (21) and the laser head connection line (22) to adjust the power and emission time of the laser beam (5).

3. The laser-assisted enhanced molten deposition device according to claim 1, characterized in that: The clamp (3) is made of an alloy material with a certain strength or other material with good heat resistance and high strength, and comprises: a clamp bolt hole (27), a nozzle clamping position (28), and a laser head clamping position (29); wherein one end of the clamp (3) accurately clamps the laser head (4) through the laser head clamping position (29), and the other end clamps the nozzle mounting plate (8) through the nozzle clamping position (28), thereby accurately clamping the nozzle (9); by tightening the bolts at the clamp bolt hole (27), the laser head (4) and the nozzle (9) are firmly fixed in the middle position.

4. The laser-assisted enhanced molten deposition device according to claim 1, characterized in that: The laser generator (1) uses a low-power laser, and the irradiation range of the laser beam (5) covers the starting point to the end point of the deposition layer (11).

5. A forming method of a laser-assisted enhanced molten deposition device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: The wire (6) is transported to the nozzle (16) inside the heating mechanism (15) through the wire feeding mechanism (7); S2: heating the wire (6) in the nozzle (16) by means of a heating mechanism (15) until the wire is melted, thereby obtaining a wire melt (10); S3: The motion mechanism drives the nozzle (9) to move a distance XA along a preset path in the X direction, and extrude the molten wire (10) onto the substrate (12) through the nozzle (16), completing the first deposition layer, and the printing platform (13) moves down a preset distance ZA in the Z direction; S4: the motion mechanism drives the nozzle (9) to move a distance XA along the -X direction, so that the nozzle (9) returns to the starting point; S5: The motion mechanism drives the nozzle (9) to move along the X direction along a preset path, and the wire melt (10) is squeezed onto the first deposition layer through the nozzle (16), completing the second deposition layer, and the printing platform (13) moves downward along the Z direction by a preset distance ZA; S6: The motion mechanism continues to drive the nozzle (9) to move a distance XA+△X along the -X direction, and through the displacement compensation amount +△X, the laser head (4) is aligned with the starting point of the second deposition layer; S7: the motion mechanism drives the laser head (4) to move a distance XA along the X direction on a preset path, and the controller (2) controls the laser head (4) to emit a laser beam (5) to irradiate the second deposition layer. The second deposition layer is heated and melted to a glass transition temperature under the irradiation of the laser, and the second deposition layer in a viscous flow state is further fused with the first deposition layer; S8: The motion mechanism drives the nozzle (9) to move a distance XA-△X along the -X direction on a preset path, so that the nozzle (9) returns to the starting point; S9: Repeat steps S5, S6, S7, and S8 until printing is completed.

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