Double-beam deposition head, additive manufacturing equipment and additive manufacturing method

Abstract

The invention discloses a double-beam deposition head, additive manufacturing equipment and an additive manufacturing method. The deposition head is provided with a first light inlet channel, a second light inlet channel and a light outlet channel. The light outlet channel is coaxially communicated with the light outlet end of the first light inlet channel; collimating lenses are arranged at the light inlet ends of the first light inlet channel and the second light inlet channel; a light guide channel is communicated between the light outlet end of the first light inlet channel and the light outlet end of the second light inlet channel, and the light guide channel extends in the radial direction of the first light inlet channel and the second light inlet channel. The second light inlet channel is provided with a first beam combiner for reflecting the first laser beam into the light guide channel, the first light inlet channel is internally provided with a second beam combiner for reflecting the first laser beam into the light outlet channel, and the first beam combiner and the second beam combiner are correspondingly distributed at the two ends of the light guide channel; and a focusing mirror is arranged at the light-emitting end of the light-emitting channel, so that the problem of direction dependence of an existing laser fuse additive manufacturing technology is solved.

Description

Technical Field

[0001] The present invention relates to the field of advanced manufacturing technologies, and particularly to a dual-beam deposition head, an additive manufacturing device, and an additive manufacturing method. Background Art

[0002] Existing laser energy deposition additive manufacturing technologies all absorb laser energy through the heat conduction mode. Due to the high reflectivity of metals to lasers, a large amount of laser energy is not effectively utilized, resulting in a very limited deposition efficiency in additive manufacturing. Therefore, the dual-laser wire melting technology based on the keyhole effect has been proposed in the prior art. This laser energy distribution method makes the dual-laser additive manufacturing technology based on the keyhole effect have the advantages of high efficiency and high quality compared with traditional additive manufacturing technologies.

[0003] However, the disadvantage of the dual-laser wire melting technology based on the keyhole effect is that it can only perform additive manufacturing in a single direction and has a high direction dependence. By significantly rotating the deposition head or adding a wire follow-up device to change the relative position of the light and the wire, the direction dependence problem can be solved. However, significantly rotating the deposition head brings device interference problems, and the introduction of the wire follow-up device will increase the complexity of the device and the equipment cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a dual-beam deposition head, an additive manufacturing device, and an additive manufacturing method to solve the problems existing in the above-mentioned prior art. The structure of the entire dual-beam deposition head is convenient for adjusting its posture, and thus an additive manufacturing method in two reciprocating directions can be realized, solving the direction dependence problem of the keyhole effect dual-laser wire melting additive manufacturing technology in the prior art.

[0005] To achieve the above purpose, the present invention provides the following solution: The present invention provides a dual-beam deposition head, including a deposition head body; the deposition head is provided with a first light inlet channel and a second light inlet channel respectively for the first laser beam and the second laser beam to pass through, and an outlet channel for the first laser beam and the second laser beam to pass through after being combined; the first light inlet channel and the second light inlet channel are arranged side by side and parallel; the outlet channel is coaxially connected to the outlet end of the first light inlet channel; collimating mirrors are provided at the light inlet ends of the first light inlet channel and the second light inlet channel; a light guiding channel is connected between the outlet end of the first light inlet channel and the outlet end of the second light inlet channel, and the light guiding channel extends along the radial direction of the first light inlet channel and the second light inlet channel; the second light inlet channel is provided with a first beam combining mirror for reflecting the first laser beam into the light guiding channel, and the first light inlet channel is provided with a second beam combining mirror for reflecting the first laser beam into the outlet channel, and the first beam combining mirror and the second beam combining mirror are correspondingly distributed at both ends of the light guiding channel; a focusing mirror is provided at the outlet end of the outlet channel.

[0006] Preferably, a spot size adjusting mechanism is provided in each of the first light incident channel and the second light incident channel. One spot size adjusting mechanism is located between the first beam combiner and the corresponding collimator, and the other spot size adjusting mechanism is located between the second beam combiner and the corresponding collimator.

[0007] Preferably, a beam centering adjusting mechanism is provided in each of the first light incident channel and the second light incident channel. One beam centering adjusting mechanism is located between the first beam combiner and the corresponding spot size adjusting mechanism, and the other beam centering adjusting mechanism is located between the second beam combiner and the corresponding spot size adjusting mechanism.

[0008] Preferably, the light output channel is provided with a compressed air interface, which is docked at the light output end of the light output channel and is provided with a through hole for the first laser beam and the second laser beam to pass through, and the through hole is filled with compressed air.

[0009] Preferably, fiber optic interfaces are provided at the light incident ends of the first light incident channel and the second light incident channel, and each collimator is located on the light output side of the corresponding fiber optic interface.

[0010] There is also provided an additive manufacturing device, including the dual-beam deposition head, a wire feeding assembly, a first laser and a second laser for respectively supplying a first laser beam and a second laser beam;

[0011] The wire feeding assembly includes a moving base, a first telescopic rod, a rotating member and a wire feeding nozzle;

[0012] The moving base is movably installed along the radial direction of the light output channel at the light output channel. The first telescopic rod is located on one side of the light output channel, one end of which is fixed on the moving base, and the other end is rotatably connected to a rotating member. The wire feeding nozzle is installed on the rotating member and rotates synchronously with the rotating member, and the wire feeding nozzle is equipped with a wire feeder for supplying wire to it;

[0013] The first laser and the second laser are respectively connected to the light incident ends of the first light incident channel and the second light incident channel.

[0014] Preferably, the first telescopic rod is provided with a second telescopic rod extending parallel thereto. One end of the second telescopic rod is fixed on the moving base, and the other end is rotatably connected to the rotating member.

[0015] Preferably, the wire feeding nozzle is equipped with a shielding gas supply mechanism. A gas delivery pipe is coaxially sleeved on the outer peripheral side of the wire feeding nozzle. A gas delivery interface communicating with the shielding gas supply mechanism is formed on the pipe wall of the gas delivery pipe. The gas delivery pipe is provided with a gas outlet for the wire material to extend out, and the gas outlet faces the molten pool.

[0016] Preferably, the dual-beam deposition head is equipped with a manipulator for driving its movement.

[0017] There is also provided an additive manufacturing method, including the following steps:

[0018] S1. Planning the deposition track;

[0019] S2. Setting the motion parameters of the manipulator, the attitude of the dual-beam deposition head, and the deposition process parameters;

[0020] S3. During the additive manufacturing process, driving the manipulator to move along a predetermined track, and adjusting the attitude of the dual-beam deposition head and the deposition process parameters according to the deposition direction and track.

[0021] The present invention has achieved the following technical effects compared with the prior art:

[0022] The dual-beam deposition head provided by the present invention performs coaxial coupling on the first laser beam and the second laser beam. The settings of the collimating mirror, the first beam combining mirror, the second beam combining mirror, and the focusing mirror enable the first laser beam to sequentially pass through the corresponding collimating mirror, the second beam combining mirror, and the focusing mirror, and the second laser beam to pass through the corresponding collimating mirror, be reflected by the first beam combining mirror and the second beam combining mirror in sequence, and then pass through the focusing mirror, so that the first laser beam and the second laser beam with different wavelengths are combined and focused. It is ensured that the diameter of the focused spot of the first laser beam is 0.1 mm - 0.8 mm, which is mainly used for melting the wire material, and the diameter of the spot of the second laser beam in the focal plane of the first laser beam is 3 mm - 6 mm, which is mainly used for preheating and melting the substrate. The structure of the entire dual-beam deposition head facilitates adjusting its attitude. Furthermore, by combining with adjusting the deposition process parameters, an additive manufacturing method in two reciprocating directions can be achieved. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the entire additive manufacturing equipment of the present invention;

[0025] Figure 2 a is the front view of the structure of the dual-beam deposition head of the present invention,Figure 2 Figure b is the left view of the dual-beam deposition head structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the deposition track of the present invention;

[0027] Figure 4 They are schematic diagrams of the attitudes of the dual-beam deposition head under different deposition directions. Figure 4 Figure a is the schematic diagram when the wire is in the front; Figure 4 Figure b is the schematic diagram when the wire is in the back;

[0028] Figure 5 It is the cross-section of the deposited layer. Figure 5 Figure a is the single-pass deposited layer with the wire in the front; Figure 5 Figure b is the single-pass deposited layer with the wire in the back; Figure 5 Figure c is the deposited layer for reciprocating additive manufacturing.

[0029] Among them: 1. Dual-beam deposition head; 2. Fiber optic interface; 3. Spot size adjustment mechanism; 4. Beam alignment adjustment mechanism; 5. Collimating mirror; 6. First beam combiner; 7. Focusing mirror; 8. Connection plate; 9. Moving base; 10. First telescopic rod; 11. Second telescopic rod; 12. Wire feeding nozzle; 13. Wire feeding tube; 14. Gas input hose; 15. Compressed air assembly; 16. Fixed back plate; 17. First laser; 18. Second laser; 19. Manipulator; 20. Wire feeder; 21. Protection gas supply mechanism; 22. Control system. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described 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.

[0031] The purpose of the present invention is to provide a dual-beam deposition head, an additive manufacturing device and an additive manufacturing method to solve the problems existing in the above-mentioned prior art. The structure of the entire dual-beam deposition head facilitates the adjustment of its attitude, and thus can realize the additive manufacturing method in two reciprocating directions, solving the direction dependence problem of the keyhole effect dual-laser wire melting additive manufacturing technology in the prior art.

[0032] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0033] As Figures 1 to 5As shown in the figure, this embodiment provides a dual-beam deposition head, which includes a deposition head body; the deposition head is provided with a first light inlet channel and a second light inlet channel respectively for the first laser beam and the second laser beam to pass through, and an outlet channel for the combined first laser beam and the second laser beam to pass through; the first light inlet channel and the second light inlet channel are arranged side by side and in parallel; the outlet channel is coaxially connected to the light outlet end of the first light inlet channel; collimating mirrors 5 are provided at the light inlet ends of the first light inlet channel and the second light inlet channel; a light guiding channel is connected between the light outlet end of the first light inlet channel and the light outlet end of the second light inlet channel, and the light guiding channel extends along the radial direction of the first light inlet channel and the second light inlet channel; the second light inlet channel is provided with a first beam combining mirror 6 for reflecting the first laser beam into the light guiding channel, and a second beam combining mirror for reflecting the first laser beam into the outlet channel is provided in the first light inlet channel. The first beam combining mirror 6 and the second beam combining mirror are correspondingly distributed at both ends of the light guiding channel, and the first laser beam can pass through the second beam combining mirror; a focusing mirror 7 is provided at the light outlet end of the outlet channel.

[0034] The dual-beam deposition head 1 provided by the present invention co-axially couples the first laser beam and the second laser beam. The settings of the collimating mirror 5, the first beam combining mirror 6, the second beam combining mirror and the focusing mirror 7 enable the first laser beam to sequentially pass through the corresponding collimating mirror 5, the second beam combining mirror and the focusing mirror 7, and the second laser beam to pass through the corresponding collimating mirror 5, and sequentially pass through the reflections of the first beam combining mirror 6 and the second beam combining mirror, and then pass through the focusing mirror 7, so that the first laser beam and the second laser beam with different wavelengths are combined and focused. It is ensured that the diameter of the focused spot of the first laser beam is 0.1 mm - 0.8 mm, which is mainly used to melt the wire material, and the diameter of the spot of the second laser beam in the focal plane of the first laser beam is 3 mm - 6 mm, which is mainly used to preheat and melt the substrate. The structure of the entire dual-beam deposition head 1 facilitates the adjustment of its posture. Furthermore, by combining the adjustment of the deposition process parameters, an additive manufacturing method in two reciprocating directions can be realized. In a preferred embodiment, the diameter of the focused spot of the first laser beam is 0.3 mm, and the diameter of the focused spot of the second laser beam is 3 mm.

[0035] Preferably, the power density of the focused spot of the first laser beam is 10 6 W / cm 2 -10 7 W / cm 2 , and the power density of the focused spot of the second laser beam is 10 4 W / cm 2 -10 5 W / cm 2 .

[0036] In one embodiment, a spot size adjusting mechanism 3 is provided in each of the first light incident channel and the second light incident channel. The spot size adjusting mechanism 3 is used to change the diameter of the focused spot. One spot size adjusting mechanism 3 is located between the first beam combining mirror 6 and the corresponding collimating mirror 5, and the other spot size adjusting mechanism 3 is located between the second beam combining mirror and the corresponding collimating mirror 5. Preferably, spot size adjusting knobs for adjusting the spot size adjusting mechanism 3 are provided on the outer walls of the first light incident channel and the second light incident channel.

[0037] In one embodiment, a beam centering adjusting mechanism 4 is provided in each of the first light incident channel and the second light incident channel. The beam centering adjusting mechanism 4 is used to make the first laser beam and the second laser beam coaxial. One beam centering adjusting mechanism 4 is located between the first beam combining mirror 6 and the corresponding spot size adjusting mechanism 3, and the other beam centering adjusting mechanism 4 is located between the second beam combining mirror and the corresponding spot size adjusting mechanism 3. Preferably, beam centering knobs for adjusting the beam centering adjusting mechanism 4 are provided on the outer walls of the first light incident channel and the second light incident channel.

[0038] In one embodiment, the light output channel is provided with a compressed air interface 15. The compressed air interface 15 is connected to the light output end of the light output channel and is provided with through holes for the first laser beam and the second laser beam to pass through. Compressed air is filled inside the through holes. By filling compressed air at the compressed air interface 15, the light output end of the light output channel is blocked to prevent the slag generated during the deposition process from splashing into the light output channel and damaging the focusing mirror 7 inside the light output channel. Preferably, the compressed air interface 15 has an annular structure and is detachably connected coaxially to the light output end of the light output channel. The hollow structure inside the compressed air structure serves as the through hole for the first laser beam and the second laser beam to pass through. An air inlet is provided on the side wall of the compressed air interface 15, and the air inlet is communicated with a compressed air supply mechanism. The through hole on the compressed air interface 15 serves as the air outlet to conduct the compressed air.

[0039] Furthermore, fiber optic interfaces 2 are provided at the light incident ends of the first light incident channel and the second light incident channel. Each collimating mirror 5 is located on the light output side of the corresponding fiber optic interface 2. Fibers are connected through the fiber optic interfaces 2 so that the first light incident channel and the second light incident channel are each connected to a corresponding laser through a fiber.

[0040] An additive manufacturing device is also provided, which includes a dual-beam deposition head 1, a wire feeding assembly, a first laser 17 and a second laser 18 for respectively supplying a first laser beam and a second laser beam; the wire feeding assembly includes a moving base 9, a first telescopic rod 10, a rotating member and a wire feeding nozzle 12; the moving base 9 is movably installed along the radial direction of the light output channel at the light output channel, the first telescopic rod 10 is located on one side of the light output channel, one end of which is fixed on the moving base 9, and the other end is rotatably connected with the rotating member, the wire feeding nozzle 12 is installed on the rotating member and rotates synchronously with the rotating member, and the wire feeding nozzle 12 is equipped with a wire feeder 20 for supplying wire material thereto. The wire feeder 20 pushes the wire material to enter from the tail of the wire feeding nozzle 12 coaxially through the wire feeding tube 13. The wire feeder 20 satisfies that the repeatability error of the wire feeding speed is within ±5%, has the function of straightening the wire material, and the wire feeder 20 can transport wire materials with a diameter range of 1.0 mm - 2.0 mm. Preferably, the wire material is made of ER316L stainless steel wire, and preferably its diameter is 1.2 mm; the first laser 17 and the second laser 18 are respectively connected to the light input ends of the first light input channel and the second light input channel. Preferably, the first laser 17 and the second laser 18 are respectively connected to the fiber optic interfaces 2 of the first light input channel and the second light input channel through optical fibers.

[0041] Among them, the first laser 17 and the second laser 18 have different laser wavelengths. The first laser 17 can be a fiber laser, a semiconductor laser or a disk laser, with a wavelength range of 808 nm - 1070 nm, and is used to induce a keyhole in the wire material. Preferably, the first laser 17 is a fiber laser with a wavelength of 1070 mm; the second laser 18 can be a semiconductor laser, a frequency-doubled fiber laser or a frequency-doubled disk laser, with a wavelength range of 405 nm - 980 nm, and is used to provide a uniform laser energy distribution, and then preheat the substrate. Preferably, the second laser 18 is a semiconductor laser with a wavelength of 915 nm.

[0042] The entire device connects the dual-beam deposition head 1, the wire feeding assembly, the first laser 17 and the second laser 18 to form the basic structure of additive manufacturing, and moves the position of the wire feeding nozzle 12 through the moving base 9 and the first telescopic rod 10, and adjusts the angle of the wire feeding nozzle 12 through the rotating member, so as to realize the precise cooperation between the wire material and the combined laser beam, and control the wire material and the combined laser beam to be in the same plane.

[0043] Among them, the combined laser beam of the first laser beam and the second laser beam is in the same plane as the wire material, and the included angle between the optical axis of the combined laser beam and the wire material is 20 - 60°, preferably 45°; moreover, the deposition direction is divided into two types: the wire material is in the front and the wire material is in the back. When the deposition direction is that the wire material is in the front, the included angle between the optical axis of the combined laser beam and the substrate normal line is 15 - 45°, and when the deposition direction is that the wire material is in the back, the included angle between the optical axis of the combined laser beam and the substrate normal line is ±5°.

[0044] In one embodiment, a connecting plate 8 is provided on the outer wall of the light-emitting channel. The moving base 9 is movably installed on the connecting plate 8. Preferably, two parallel strip-shaped holes are formed in the moving base 9, and the two strip-shaped holes extend along the radial direction of the light-emitting channel. A pre-tightening bolt assembly is detachably connected between the connecting plate 8 and the corresponding strip-shaped hole.

[0045] In one embodiment, the rotating member is a plate-like structure, which is rotatably connected to the end of the first telescopic rod 10 that is not connected to the moving base 9. A strip-shaped hole coaxial with its rotation center and having an arc-shaped structure is formed in the rotating member. A pre-tightening bolt assembly is detachably connected between the first telescopic rod 10 and the strip-shaped hole.

[0046] Preferably, the first telescopic rod 10 is provided with a second telescopic rod 11 extending in parallel therewith. One end of the second telescopic rod 11 is fixed to the moving base 9, and the other end is rotatably connected to the rotating member, so that the first telescopic rod 10 and the second telescopic rod 11 cooperate to connect the moving base 9 and the rotating member, ensuring the stability of the movement of the rotating member.

[0047] Furthermore, the wire feeding nozzle 12 is provided with a shielding gas supply mechanism 21. A gas supply pipe is coaxially sleeved on the outer peripheral side of the wire feeding nozzle 12. A gas supply interface communicating with the shielding gas supply mechanism 21 is formed on the pipe wall of the gas supply pipe. The gas supply pipe is provided with a gas outlet for the wire material to extend out, and the gas outlet faces the molten pool. During the use of the device, the shielding gas output by the shielding gas supply mechanism 21 is input into the gas supply pipe through the gas input hose 14 by the gas supply interface, and is dispersed to the molten pool through the gas outlet, so as to form a shielding gas atmosphere at the molten pool.

[0048] Furthermore, the dual-beam deposition head 1 is provided with a manipulator 19 for driving its movement. Among them, the degree of freedom of the manipulator 19 is ≥6, the load is ≥30 kg, and the repeat positioning accuracy is ±0.1 mm. During the additive manufacturing process, by driving the manipulator 19 to move along a set trajectory, adjusting the posture of the dual-beam deposition head 1 according to the movement direction, and cooperating with the deposition process parameters, additive manufacturing in two reciprocating directions is realized, meeting the requirements of high-efficiency additive manufacturing of large components. The direction dependence problem of the dual-laser wire melting additive manufacturing technology based on the keyhole effect is solved. Preferably, a fixed back plate 16 connected to the manipulator 19 is provided on the dual-beam deposition head 1.

[0049] Among them, the entire device is also provided with a control system 22, and the control system 22 is electrically connected to the first laser 17, the second laser 18, the manipulator 19, the wire feeder 20 and the shielding gas supply mechanism 21. During the additive manufacturing process, the control system 22 can appropriately adjust the deposition process parameters such as the laser power, wire feeding speed and shielding gas flow according to the deposition direction, so as to ensure that the deposition layer morphologies in the two deposition directions are basically the same.

[0050] Further, an additive manufacturing method is also provided, including the following steps:

[0051] S1. Plan the deposition trajectory;

[0052] S2. Set the motion parameters of the manipulator 19, the attitude of the dual-beam deposition head 1, and the deposition process parameters;

[0053] S3. During the additive manufacturing process, drive the manipulator 19 to move along a predetermined trajectory, and adjust the attitude of the dual-beam deposition head 1 and the deposition process parameters according to the deposition direction and trajectory.

[0054] Among them, as Figure 3 shown is the planned deposition trajectory. The deposition trajectory can be in the form of a straight line or a curve. When the deposition trajectory is a straight line, the attitude of the dual-beam deposition head 1 in the same deposition direction remains unchanged. When the deposition trajectory is a curve, the dual-beam deposition head 1 adjusts its attitude by rotating around the substrate normal direction to achieve deposition. The angle φ between the movement direction of the dual-beam deposition head 1 and the tangent direction of the deposition trajectory is ≤ ±3°.

[0055] As Figure 4 shown is the schematic diagram of the attitude of the dual-beam deposition head 1 in two deposition directions. When the deposition direction is with the wire in front, the angle θ between the optical axis of the laser beam emitted by the dual-beam deposition head 1 and the substrate normal is 15 - 45°. When the deposition direction is with the wire behind, the angle θ between the optical axis of the laser beam emitted by the dual-beam deposition head 1 and the substrate normal is ±5°.

[0056] In an embodiment, when the deposition direction is with the wire in front, the angle θ between the optical axis of the laser beam emitted by the dual-beam deposition head 1 and the substrate normal is 30°. The power of the first laser 17: 3500W, the power of the second laser 18: 3000W, the wire feeding speed of the wire feeder 20: 6m / min, the scanning speed of the dual-beam deposition head 1: 3.5m / min, the protective gas flow rate 20L / min; when the deposition direction is with the wire behind, the angle θ between the optical axis of the laser beam emitted by the dual-beam deposition head 1 and the substrate normal is 0°. The power of the first laser 17: 3000W, the power of the second laser 18: 2500W, the wire feeding speed of the wire feeder 20: 5m / min, the scanning speed of the dual-beam deposition head 1: 3.0m / min, the protective gas flow rate 15L / min; the deposition trajectory is Figure 3 the straight reciprocating form shown in a; the offset distance between adjacent deposition layers is 2.5mm.

[0057] Further, the cross-sectional morphology of the deposition layer obtained by the laser additive manufacturing method according to this embodiment is as Figure 5As shown. It can be seen that well-formed single-pass deposition layers are obtained in both deposition directions in this embodiment. The height of the single-pass deposition layer is about 0.8 mm, and the width is about 3 mm. The cross-sectional morphology diagram of the multi-pass deposition layer shows that continuous and stable deposition layers are obtained through the reciprocating additive manufacturing method. The effective thickness of the deposition layer is about 0.7 mm, and there are no defects such as pores and cracks, indicating that this method has high feasibility.

[0058] Adaptations made according to actual needs are all within the scope of protection of the present invention.

[0059] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0060] Specific examples are used in the present invention to elaborate on the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A dual-beam deposition head, characterized in that: comprising a deposition head body; The deposition head is provided with a first light inlet channel and a second light inlet channel for respectively allowing the first laser beam and the second laser beam to pass through, and a light outlet channel for allowing the first laser beam and the second laser beam to pass through after being combined; the first light inlet channel and the second light inlet channel are arranged side by side and in parallel; the light outlet channel is coaxially connected to the light outlet end of the first light inlet channel; Collimating lenses are provided at the light entrance ends of the first light entrance channel and the second light entrance channel; A light guide channel is connected between the light exit end of the first light entrance channel and the light exit end of the second light entrance channel, and the light guide channel extends radially along the first light entrance channel and the second light entrance channel; the second light entrance channel is provided with a first beam combining mirror for reflecting the first laser beam into the light guide channel, and the first light entrance channel is provided with a second beam combining mirror for reflecting the first laser beam into the light exit channel, and the first beam combining mirror and the second beam combining mirror are correspondingly distributed at both ends of the light guide channel; A focusing mirror is provided at the light output end of the light output channel.

2. The dual-beam deposition head according to claim 1, characterized in that: The first light inlet channel and the second light inlet channel are both provided with a spot size adjustment mechanism, one of the spot size adjustment mechanisms is located between the first beam combining mirror and the corresponding collimating mirror, and the other of the spot size adjustment mechanisms is located between the second beam combining mirror and the corresponding collimating mirror.

3. The dual-beam deposition head according to claim 2, characterized in that: The first light input channel and the second light input channel are both provided with beam centering adjustment mechanisms, one beam centering adjustment mechanism is located between the first beam combining mirror and the corresponding spot size adjustment mechanism, and the other beam centering adjustment mechanism is located between the second beam combining mirror and the corresponding spot size adjustment mechanism.

4. The dual-beam deposition head according to any one of claims 1 to 3, characterized in that: The light output channel is equipped with a compressed air interface, which is connected to the light output end of the light output channel and is provided with through holes for the first laser beam and the second laser beam to pass through, and the through holes are filled with compressed air.

5. The dual beam deposition head according to claim 4, characterized in that: The light inlet ends of the first light inlet channel and the second light inlet channel are both provided with optical fiber interfaces, and each of the collimating lenses is located at the light outlet side of the corresponding optical fiber interface.

6. An additive manufacturing device using the dual-beam deposition head according to any one of claims 1 to 5, characterized in that: It includes the dual-beam deposition head, a wire feeding assembly, a first laser and a second laser for supplying a first laser beam and a second laser beam respectively; The wire feeding assembly comprises a movable base, a first telescopic rod, a rotating member and a wire feeding nozzle; The movable base is movably installed at the light outlet channel along the radial direction of the light outlet channel, the first telescopic rod is located at one side of the light outlet channel, one end of the first telescopic rod is fixed to the movable base, and the other end is rotatably connected to a rotating member, the wire feeding nozzle is installed on the rotating member and rotates synchronously with the rotating member, and the wire feeding nozzle is equipped with a wire feeding machine for supplying wire material to it; The first laser and the second laser are connected to the light input ends of the first light input channel and the second light input channel respectively.

7. The additive manufacturing device according to claim 6, characterized in that: The first telescopic rod is matched with a second telescopic rod extending parallel to the first telescopic rod. One end of the second telescopic rod is fixed on the moving base, and the other end is rotatably connected to the rotating member.

8. The additive manufacturing device according to claim 7, characterized in that: The wire feeding nozzle is equipped with a protective gas supply mechanism, and an air supply pipe is coaxially sleeved on the outer peripheral side of the wire feeding nozzle. A gas supply interface connected to the protective gas supply mechanism is opened on the tube wall of the air supply pipe. The air supply pipe is provided with an air outlet for the wire to extend out, and the air outlet faces the molten pool.

9. The additive manufacturing device according to claim 8, characterized in that: The double-beam deposition head is equipped with a robot for driving the movement thereof.

10. An additive manufacturing method using the additive manufacturing device according to any one of claims 6 to 9, characterized in that: The steps include: S1. Plan the deposition trajectory; S2, setting the robot motion parameters, the posture of the dual-beam deposition head and the deposition process parameters; S3. During the additive manufacturing process, the robot is driven to move along a predetermined trajectory, and the posture and deposition process parameters of the dual-beam deposition head are adjusted according to the deposition direction and trajectory.

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