Laser fuse wire additive device capable of actively rotating laser beam

Abstract

The invention relates to the field of laser material increase, in particular to a laser fuse wire material increase device with a laser beam capable of actively rotating, which comprises a wire feeding pipe, a laser beam generator and a UR axis driver, and is characterized in that the wire feeding pipe is provided with a straight wire feeding channel arranged along the gravity direction; the laser beam generator is used for forming two non-parallel and symmetrical laser beams on the two sides of the symmetrical face of the wire feeding pipe, the UR axis driver is used for changing the directions of the laser beams, and the multiple laser beams are generated through the laser beam generator, the beam splitting lens and the multiple reflection focus lens sets; or the plurality of laser beams are directly generated by the plurality of laser beam generators. According to the embodiment of the invention, the at least two laser beams are symmetrically arranged on the two sides of the straight wire feeding channel in the gravity direction, and each laser beam can independently rotate around the two rotating shafts, so that the relative position relationship between the wire and the light spot is kept unchanged during scanning in all directions; and the change of a light wire coupling mode and a nonlinear scanning path can be realized.

Description

Technical Field

[0001] The invention relates to the field of laser material addition, and in particular to a laser fuse material addition device with actively rotating laser beam. Background Art

[0002] Laser fuse additive manufacturing is a technology based on a three-dimensional model. It uses wire as raw material, quickly melts the wire through a high-energy laser beam, and then accumulates layer by layer after the wire solidifies to eventually form metal parts.

[0003] At present, the wire feeding technologies for laser fused wire additive include:

[0004] 1. Off-axis wire feeding technology refers to feeding the wire from the outside of the laser beam into the molten pool generated by the laser. Its defects are: there are differences in each scanning direction, poor light-wire coupling, etc., which cannot meet the requirements of consistency of cladding layer size and performance in all directions.

[0005] Second, the three-beam coaxial wire feeding technology uses a prism to divide a single beam of light into three laser beams evenly distributed in the circumference, forming a three-beam hollow area. The metal wire enters the area through the wire guide tube, realizing the coaxial distribution of the metal wire and the three beams, and the focusing mirror focuses the three beams on the workpiece surface. Its defects are: the wire feeding path has a certain curvature, the wire feeding angle gradually changes during the wire feeding process, and the wire deflects due to stress release after leaving the wire feeding tube, resulting in an unstable molten pool and poor forming quality.

[0006] 3. Multi-beam integrated optical coaxial wire feeding technology, the laser head is fixed above the work platform and arranged in a ring, ensuring that the angles of each laser are equal to the vertical direction, and the ring laser heat source composed of multiple lasers is focused on the workpiece surface. Its disadvantages are: it requires multiple lasers to achieve, the integration is difficult, and the use and maintenance costs are high.

[0007] 4. Split annular beam coaxial wire feeding technology: a single laser beam forms an annular beam through a conical lens, and then the annular beam is divided into two semi-annular beams through a prism. The two separated semi-annular beams are conducive to the metal wire passing through the wire guide tube and entering the working area axially. Then, the two semi-annular beams are reconnected into an annular beam through another prism, and finally form an annular spot on the workpiece surface through a focusing lens. Its defects are: the fixed focal spot has poor flexibility, and it is impossible to achieve special process requirements such as changes in the light wire coupling mode and stirring of the molten pool. It is difficult to deposit refractory metal materials or manufacture workpieces with complex shapes.

[0008] In addition, existing coaxial wire feeding technologies are difficult to solve the problem of the change in the relative position of the laser and the wire after the wire scanning direction changes. For example, when the wire moves along the X-axis direction, the light spot is located on the front and back sides of the wire's forward direction, while when the wire moves along the Y-axis direction, the light spot is located on the left and right sides of the wire's forward direction. Summary of the invention

[0009] The object of the present invention is to provide a laser fuse additive device with actively rotating laser beam, so as to solve the problem of low flexibility of the light spot in the traditional coaxial wire feeding technology.

[0010] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0011] A laser fuse material adding device with actively rotating laser beam, comprising:

[0012] A wire feeding tube is provided with a straight wire feeding channel arranged along the gravity direction, and the wire material passes through the wire feeding channel to reach the deposition area;

[0013] At least two laser beam generators are symmetrically arranged on both sides of the wire feeding tube relative to the plane where the center line of the wire feeding channel is located, and are used to emit laser beams and form focal spots in the deposition area;

[0014] A plurality of UR axis drivers are respectively connected to each of the laser beam generators and are used to drive each of the laser beam generators to rotate around a U axis and an R axis that are orthogonal to each other.

[0015] A laser fuse material adding device with actively rotating laser beam, comprising:

[0016] A wire feeding tube is provided with a straight wire feeding channel arranged along the gravity direction, and the wire material passes through the wire feeding channel to reach the deposition area;

[0017] A laser beam generator emits a laser beam in a direction orthogonal to the wire feeding channel;

[0018] A beam splitter lens, disposed between the wire feeding tube and the laser beam generator, for evenly splitting the laser beam emitted by the laser beam generator into at least two branch beams that are not parallel to each other and are symmetrical with respect to the center line of the wire feeding channel;

[0019] A plurality of reflective focusing lens groups are symmetrically arranged on the peripheral side of the wire feeding tube relative to the plane where the center line of the wire feeding channel is located, and are used to reflect and focus each branch light beam, so as to form a focal spot in the deposition area;

[0020] A plurality of UR axis drivers are respectively connected to each of the reflective focusing lens groups and are used to change the reflection path of each branch light beam so that the ends of the branch light beams rotate around U and R axes that are orthogonal to each other.

[0021] Furthermore, each of the reflective focusing lens groups comprises:

[0022] A first reflector, rotatably arranged around a U axis in a path of the branched light beam after it passes through the beam splitting lens and is refracted;

[0023] A second reflector is rotatably arranged around an R axis in a path of the branched light beam after it is reflected by the first reflector, and the U axis and the R axis are orthogonal;

[0024] A focusing lens is arranged in the path of the branch light beam after being reflected by the second reflector.

[0025] Furthermore, each UR axis drive includes:

[0026] a first motor, drivingly connected to the first reflector, and used to drive the first reflector to rotate around the U axis;

[0027] The second motor is transmission-connected to the second reflector and is used to drive the second reflector to rotate around the R axis.

[0028] Furthermore, the laser beam generator comprises:

[0029] Optical fiber, used to emit uniformly divergent incident light;

[0030] A collimating lens is arranged in the transmission path of the incident light and is used to collimate the incident light.

[0031] Furthermore, one side of the beam splitter lens is a plane, and the other side is divided into two angled refractive surfaces by a top edge, so that the laser beam emitted by the laser beam generator is evenly separated into two branch beams, and the number of the reflective focusing lens group and the UR axis driver is two.

[0032] Furthermore, the outside of the wire feeding tube is covered with a wire tube outer cover, and the wire tube outer cover has a first air supply channel for conveying inert gas. The first air supply channel is used to form an annular protective air curtain at the head of the wire feeding tube that surrounds the wire material, is coupled with the wire material and is consistent in all directions.

[0033] Furthermore, the wire feeding tube, the laser beam generator, the beam splitting lens and the reflective focusing lens group are all arranged inside the shell, and the shell is provided with a cooling water channel inside and a water inlet and a water outlet outside.

[0034] Furthermore, it also includes a protective lens, which is arranged in the path of the branch light beam after it is reflected and focused by the reflective focusing lens group. The wire feeding tube, the laser beam generator, the splitter lens and the reflective focusing lens group are all arranged inside the shell. The inside of the shell is also provided with a second air supply channel, and the outside of the shell is provided with an air inlet and an air outlet. The gas input through the air inlet flows toward the air outlet along the second air supply channel, and the gas ejected from the air outlet covers the surface of the protective lens, thereby forming a protective air curtain on the outside of the protective lens.

[0035] Furthermore, the outer side of the protective lens is covered with a protective cover, the protective cover is coaxially arranged with the protective lens, an eccentric light-transmitting hole is arranged on the protective cover, the shell is installed with a third motor, the third motor is used to drive the protective cover to rotate around its own axis, the air inlet is arranged on the shell, and the air outlet is arranged on the protective cover.

[0036] Compared with the prior art, this application has the following beneficial effects:

[0037] A laser fuse additive device with actively rotating laser beams is provided. In an embodiment of the present invention, at least two laser beams are symmetrically arranged on both sides of a straight wire feeding channel along the gravity direction, and each laser beam can independently rotate around two rotation axes, thereby achieving that the relative position relationship between the wire and the light spot remains unchanged when scanning in various directions, and can achieve changes in the light-wire coupling mode and a non-linear scanning path. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0039] Figure 1 It is a structural schematic diagram of the first embodiment of the present invention;

[0040] Figure 2 is a three-dimensional diagram of the internal structure of a second embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of a light propagation path of a second embodiment of the present invention;

[0042] Figure 4 A perspective view of the external structure of the second embodiment of the present invention;

[0043] Figure 5 A three-dimensional diagram of the external structure of the second embodiment of the present invention from another perspective;

[0044] Figure 6 is a cross-sectional view of a wire feeding tube according to a second embodiment of the present invention;

[0045] Figure 7 A three-dimensional diagram of the external structure of a third embodiment of the present invention from one viewing angle;

[0046] The numbers in the figure represent the following:

[0047] 1-wire feeding tube; 11-conical tube opening; 12-wire feeding nozzle; 13-wire tube outer cover; 14-first air supply channel; 15-outer cover nozzle;

[0048] 2-laser beam generator; 21-optical fiber; 22-collimating lens;

[0049] 3-beam splitting lens; 31-top edge;

[0050] 41-first reflecting mirror; 42-second reflecting mirror; 43-focusing lens;

[0051] 51-first motor; 52-second motor;

[0052] 6-housing; 61-water inlet; 62-water outlet; 63-protective lens; 64-air inlet; 65-air outlet; 66-third motor; 67-protective cover; 68-light transmission hole. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Laser fuse additive manufacturing is a technology based on a three-dimensional model. It uses wire as raw material, quickly melts the wire through a high-energy laser beam, and then accumulates layer by layer after the wire solidifies to eventually form metal parts.

[0055] At present, the wire feeding technology of laser fused wire additive has the following defects:

[0056] 1. The scanning directions of the side-axis wire feeding technology are poorly differentiated and the optical wire coupling is poor.

[0057] 2. The wire feeding path of the three-beam coaxial wire feeding technology has a certain curvature, and the wire deflects due to stress release after leaving the wire feeding tube.

[0058] 3. Multi-beam integrated intra-optical coaxial wire feeding technology requires multiple lasers to implement, which is difficult to integrate and has high usage and maintenance costs.

[0059] 4. The flexibility of fixing the focal spot by coaxial wire feeding technology within the ring-shaped beam is poor.

[0060] The basic idea to solve the problem is to design a laser fuse additive device with active laser beam rotation, which has the following characteristics:

[0061] 1. Design the center line of the wire feeding channel along the direction of gravity to eliminate the curvature of the wire feeding path.

[0062] Second, the plane where the center line of the wire feeding channel is located is taken as the symmetry plane, and two symmetrical laser beams are arranged on both sides of the symmetry plane to form a two-beam coaxial wire feeding structure.

[0063] 3. Each laser beam has two rotational degrees of freedom, which can adjust the direction of the emitted laser in real time, so that the relative position relationship between the wire and the light spot remains unchanged under different moving paths during the additive process, that is: when the wire moves along the X-axis direction, the light spot is located on the front and back sides of the wire's forward direction; when the wire moves along the Y-axis direction, the light spot can move to the front and back sides of the wire's forward direction as the laser beam rotates.

[0064] Based on the above technical means, the problem of unstable surface quality of the cladding layer caused by differences in scanning directions is solved. At the same time, the rapidly changing focal spot can realize special processes such as changes in light-wire coupling mode and non-linear scanning paths. For example, the molten pool can be in front of or behind the forward direction of the wire, and the light spot can move forward in a wave-like manner along the forward direction of the wire.

[0065] (First embodiment)

[0066] refer to Figure 1 The laser fuse additive device includes: a wire feeding tube 1, two laser beam generators 2 and two UR axis drivers.

[0067] The wire feeding tube 1 has a straight wire feeding channel arranged along the gravity direction. The straightened wire passes through the tail and head of the wire feeding tube 1 in sequence to reach the deposition area.

[0068] Two laser beam generators 2 are symmetrically arranged on both sides of the wire feeding tube 1 relative to the plane where the center line of the wire feeding channel is located, and are used to emit laser beams to the deposition area to form a focal spot on the surface of the wire.

[0069] The two UR axis drivers are respectively connected to the two laser beam generators 2, and are used to drive the two laser beam generators 2 to rotate around the U axis and R axis orthogonal to each other, so as to keep the relative positions of the two focal spots and the wire unchanged when the wire feeding channel moves in different directions.

[0070] In addition, according to different deposition materials and deposition shapes, the two laser beam generators 2 can be driven to actively rotate through two UR axis drivers, and appropriate filament coupling mode and scanning path (double helix, parallel line, colinear, double fold line) can be selected, which is conducive to a more uniform and denser forming effect.

[0071] Furthermore, the numbers of the laser beam generators 2 and the UR-axis drivers are equal, and the numbers of the laser beam generators 2 and the UR-axis drivers can be increased as needed.

[0072] (Second embodiment)

[0073] Furthermore, the technical means of the first embodiment needs to be implemented by two lasers. In order to reduce the production, use and maintenance costs, the second embodiment uses one laser to achieve the same technical effect.

[0074] refer to Figure 2 , Figure 3 The laser fuse additive device includes: a wire feeding tube 1, a laser beam generator 2, a beam splitter lens 3, two reflective focusing lens groups and two UR axis drivers.

[0075] The wire feeding tube 1 has a wire feeding channel arranged along the gravity direction, and the straightened wire passes through the tail and head of the wire feeding tube 1 in sequence to reach the deposition area.

[0076] A laser beam generator 2 emits a laser beam in a direction orthogonal to the wire feeding channel.

[0077] The beam splitter lens 3 is arranged between the wire feeding tube 1 and the laser beam generator 2, and is used for evenly splitting the laser beam emitted by the laser beam generator 2 into two non-parallel and symmetrical branch beams.

[0078] Two reflective focusing lens groups are symmetrically arranged on both sides of the wire feeding tube 1 relative to the plane where the center line of the wire feeding channel is located, and are used to reflect and focus the two branch light beams, thereby forming a focal spot in the deposition area.

[0079] The two UR axis drivers are respectively connected to the two reflective focusing lens groups, and are used to drive the reflection paths of the two branch light beams, so that the ends of the branch light beams rotate around the U axis and R axis that are orthogonal to each other, thereby keeping the relative positions of the two focal spots and the wire unchanged when the wire feeding channel moves in different directions.

[0080] Among them, the number of branch light beams separated by the splitter lens, the number of reflective focusing lens groups and the number of UR axis drivers are equal, and the number of branch light beams, the number of reflective focusing lens groups and the number of UR axis drivers can be increased as needed.

[0081] The laser beam generator 2 includes an optical fiber 21 and a collimating lens 22 .

[0082] The optical fiber 21 is used to emit incident light in a uniformly divergent manner.

[0083] The collimating lens 22 is used to collimate the incident light output by the optical fiber 21 , and the collimated light beam is a parallel light beam with uniform energy distribution.

[0084] Each reflective focusing mirror group includes a first reflective mirror 41 , a second reflective mirror 42 and a focusing lens 43 .

[0085] The first reflector 41 is rotatably arranged around the U axis in the path of the branched light beam after it passes through the refracted beam splitter lens 3;

[0086] The second reflector 42 is rotatably arranged around the R axis in the path of the branched light beam after being reflected by the first reflector 41, and the U axis and the R axis are orthogonal;

[0087] The focusing lens 43 is disposed in the path of the branched light beam after being reflected by the second reflecting mirror 42 . After the directions of the first reflecting mirror 41 and the second reflecting mirror 42 are changed, the direction of the focusing lens 43 does not need to be adjusted.

[0088] Each UR-axis driver includes a first motor 51 and a second motor 52 .

[0089] The first motor 51 is drivingly connected to the first reflector 41 and is used to drive the first reflector 41 to rotate around the U axis.

[0090] The second motor 52 is drivingly connected to the second reflector 42 and is used to drive the second reflector 42 to rotate around the R axis.

[0091] The implementation steps of the second embodiment are as follows:

[0092] 1. Obtaining a parallel light beam: The incident light with uniform divergence is transmitted through the optical fiber 21, and the collimating lens 22 is used to collimate the light beam. The collimated light beam is a parallel light beam with uniform energy distribution.

[0093] 2. Split the parallel light beam into two: guide the parallel light beam through the splitter lens 3, one side of the splitter lens 3 is a plane, and the other side is divided into two refractive surfaces with an angle by the top edge 31. The parallel light beam is evenly separated into two non-parallel and symmetrical branch light beams through the splitter lens 3, and the two branch light beams are respectively emitted to two light beam reflection devices.

[0094] 3. Adjust the direction of the branch light beam: guide the branch light beam to pass through the first reflector 41, the second reflector 42, the focusing lens 43 and the protective lens 63 of the light beam reflecting device in sequence. The first reflector 41 is orthogonal to the rotation center axis of the second reflector 42. The laser is reflected on the first reflector 41. The first motor 51 drives the first reflector 41 to deflect and adjust the angle of the laser toward the second reflector 42. The laser is reflected on the second reflector 42. The second motor 52 drives the second reflector 42 to deflect and adjust the angle of the laser toward the focusing lens 43. After passing through the focusing lens 43, the laser passes through the protective lens 63. The laser is converged into a focusing spot at the processing position through the focusing lens 43.

[0095] refer to Figure 4 , Figure 5 and Figure 6 Other aspects of the design include:

[0096] One side of the beam splitter lens 3 is a plane, and the other side is divided by the top edge 31 into two refractive surfaces with an included angle.

[0097] The tail of the wire feeding tube 1 is provided with a tapered tube opening 11 , so that the wire can be easily inserted into the wire feeding tube 1 .

[0098] The head of the wire feeding tube 1 is provided with a detachable wire feeding nozzle 12, and the wire feeding nozzle 12 is spirally connected to the head of the wire feeding tube 1, so that the easily damaged wire feeding nozzle 12 can be easily replaced.

[0099] The outside of the wire feeding tube 1 is covered with a wire tube outer cover 13, which has a first air supply channel 14 for conveying inert gas. The first air supply channel 14 is used to form an annular protective air curtain around the wire material, coupled with the wire material and consistent in all directions at the head of the wire feeding tube 1.

[0100] The tail of the wire feeding tube 1 is threadedly connected to the wire tube outer cover 13 , and the head of the wire tube outer cover 13 is provided with a detachable outer cover mouth 15 , and the outer cover mouth 15 is threadedly connected to the head of the wire tube outer cover 13 .

[0101] The wire feeding tube 1 is arranged inside a housing 6 and is connected to a robot arm or a linear slide rail through the housing 6, so that the wire feeding tube 1 can be driven to move along a preset scanning path.

[0102] The shell 6 is provided with a cooling water channel inside and a water inlet 61 and a water outlet 62 outside. The cooling water channel is used to cool each first reflector 41 and second reflector 42 .

[0103] A protective lens 63 is provided in the path of the branched light beam after passing through the focusing lens 43 , and the protective lens 63 is used to protect the focusing lens 43 .

[0104] The shell 6 is further provided with a second air supply passage inside and an air inlet 64 and an air outlet 65 outside. The gas input through the air inlet 64 flows toward the air outlet 65 along the second air supply passage.

[0105] When the number of the air outlet 65 is 1, the air outlet 65 is disposed on one side of the protection lens 63 and faces the other opposite side, thereby forming a fan-shaped protection air curtain.

[0106] When the number of the air outlets 65 is greater than 1, the air outlets 65 are arranged around the protective lens 63 to form a disc-shaped protective air curtain to prevent the protective lens 63 from being damaged by the splashing wire.

[0107] (Third Embodiment)

[0108] Since the protective lens 63 is relatively large in size and each air outlet 65 is far away from the center of the protective lens 63 , a weak airflow protection area is formed in the center of the disc-shaped protective air curtain, which makes it difficult to prevent splashes from contacting the protective lens 63 .

[0109] refer to Figure 7 The outer side of the protection lens 63 is covered with a protection cover 67, which is coaxially arranged with the protection lens 63. An eccentric light-transmitting hole 68 is arranged on the protection cover 67. A third motor 66 is installed on the shell 6. The third motor 66 drives the protection cover 67 to rotate around its own axis through a gear transmission mechanism, and the third motor 66 moves following the actions of the first motor 51 and the second motor 52, so that the light-transmitting hole 68 can move adaptively following the change of the angle of the laser beam, so that the laser beam can always pass through the light-transmitting hole 68.

[0110] The shell 6 is also provided with a second air supply channel inside, an air inlet 64 outside, and an air outlet 65 on the protective cover 67 . Compressed air enters the shell 6 from the air inlet 64 and is then discharged through the air outlet 65 .

[0111] When the number of the air outlet 65 is 1, the air outlet 65 is disposed on one side of the light transmission hole 68 close to the center of the protection lens 63 and faces the other opposite side, thereby forming a fan-shaped protection air curtain.

[0112] When the number of the air outlets 65 is greater than 1, the air outlets 65 are arranged around the light-transmitting hole 68 to form a disc-shaped protective air curtain.

[0113] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A laser fuse additive device with active laser beam rotation, characterized in that: include: A wire feeding tube (1) is provided with a straight wire feeding channel arranged along the gravity direction, and the wire material passes through the wire feeding channel to reach the deposition area; At least two laser beam generators (2) are symmetrically arranged on both sides of the wire feeding tube (1) relative to the plane where the center line of the wire feeding channel is located, and are used to emit laser beams and form focal spots in the deposition area; A plurality of UR axis drivers are respectively connected to each of the laser beam generators (2) and are used to drive each of the laser beam generators (2) to rotate around U and R axes that are orthogonal to each other.

2. A laser fuse additive device with active laser beam rotation, characterized in that: include: A wire feeding tube (1) is provided with a straight wire feeding channel arranged along the gravity direction, and the wire material passes through the wire feeding channel to reach the deposition area; A laser beam generator (2) emits a laser beam in a direction orthogonal to the wire feeding channel; A beam splitter lens (3) is arranged between the wire feeding tube (1) and the laser beam generator (2), and is used to evenly split the laser beam emitted by the laser beam generator (2) into at least two branch beams that are not parallel to each other and are symmetrical with respect to the center line of the wire feeding channel; A plurality of reflecting and focusing lens groups are symmetrically arranged on the peripheral side of the wire feeding tube (1) relative to the plane where the center line of the wire feeding channel is located, and are used to reflect and focus each branch light beam, thereby forming a focal spot in the deposition area; A plurality of UR axis drivers are respectively connected to each of the reflective focusing lens groups and are used to change the reflection path of each branch light beam so that the ends of the branch light beams rotate around U and R axes that are orthogonal to each other.

3. The laser fuse additive device with active laser beam rotation according to claim 2, characterized in that: Each of the reflective focusing mirror groups comprises: A first reflecting mirror (41) is rotatably arranged around a U axis in a path of the branched light beam after it passes through the refracted light splitting lens (3); A second reflector (42) is rotatably arranged around an R axis in a path of the branched light beam after being reflected by the first reflector (41), and the U axis and the R axis are orthogonal; A focusing lens (43) is arranged in the path of the branch light beam after being reflected by the second reflector (42).

4. The laser fuse additive device with active laser beam rotation according to claim 3, characterized in that: Each UR axis drive includes: A first motor (51) is transmission-connected to the first reflector (41) and is used to drive the first reflector (41) to rotate around a U axis; The second motor (52) is drivingly connected to the second reflector (42) and is used to drive the second reflector (42) to rotate around the R axis.

5. The laser fuse additive device with active laser beam rotation according to claim 2, characterized in that: The laser beam generator (2) comprises: An optical fiber (21) for emitting uniformly divergent incident light; A collimating lens (22) is arranged in the transmission path of the incident light and is used to collimate the incident light.

6. A laser fuse additive device with active laser beam rotation according to any one of claims 2 to 5, characterized in that: One side of the beam splitter lens (3) is a plane, and the other side is divided into two refractive surfaces with an angle by a top edge (31), so that the laser beam emitted by the laser beam generator (2) is evenly separated into two branch beams, and the number of the reflective focusing lens group and the number of the UR axis driver are both two.

7. A laser fuse additive device with active laser beam rotation according to any one of claims 2 to 5, characterized in that: The outside of the wire feeding tube (1) is covered with a wire tube outer cover (13), and the wire tube outer cover (13) is provided with a first gas supply channel (14) for conveying inert gas, and the first gas supply channel (14) is used to form an annular protective air curtain at the head of the wire feeding tube (1) that surrounds the wire material, is coupled with the wire material and is consistent in all directions.

8. A laser fuse additive device with active laser beam rotation according to any one of claims 2 to 5, characterized in that: The wire feeding tube (1), the laser beam generator (2), the beam splitting lens (3) and the reflective focusing lens group are all arranged inside a housing (6); a cooling water channel is arranged inside the housing (6), and a water inlet (61) and a water outlet (62) are arranged outside the housing (6).

9. The laser fuse additive device with active laser beam rotation according to claim 2, characterized in that: It also includes a protective lens (63), which is arranged in the path of the branched light beam after it is reflected and focused by the reflective focusing lens group. The wire feeding tube (1), the laser beam generator (2), the beam splitting lens (3) and the reflective focusing lens group are all arranged inside the shell (6). The shell (6) is also provided with a second air supply channel inside, and an air inlet (64) and an air outlet (65) are provided outside. The gas input through the air inlet (64) flows along the second air supply channel to the air outlet (65), and the gas ejected from the air outlet (65) covers the surface of the protective lens (63), thereby forming a protective air curtain on the outside of the protective lens (63).

10. The laser fuse additive device with active laser beam rotation according to claim 9, characterized in that: The outer side of the protective lens (63) is covered with a protective cover (67), the protective cover (67) is coaxially arranged with the protective lens (63), an eccentric light-transmitting hole (68) is arranged on the protective cover (67), the shell (6) is installed with a third motor (66), the third motor (66) is used to drive the protective cover (67) to rotate around its own axis, the air inlet (64) is arranged on the shell (6), and the air outlet (65) is arranged on the protective cover (67).

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