Welding device capable of controlling light spots through bidirectional rotation

Abstract

The utility model discloses a welding device capable of controlling light spots through bidirectional rotation, which comprises a first wedge-shaped reflecting mirror rotating assembly, a second wedge-shaped reflecting mirror rotating assembly, an incident laser output assembly and a composite focusing lens, and is characterized in that the first wedge-shaped reflecting mirror rotating assembly comprises a first wedge-shaped prism and a first rotation driving piece; the second wedge-shaped reflector rotating assembly comprises a second wedge-shaped prism and a second rotating driving part, the second wedge-shaped prism is arranged on one side of the first wedge-shaped prism, and the incident laser output assembly provides incident laser for the first wedge-shaped prism; the first wedge-shaped prism reflects scanning reflection laser in the rotating process and serves as scanning incidence laser of the second wedge-shaped prism, the second wedge-shaped prism reflects scanning output laser in the rotating process, the scanning output laser is focused by the composite focusing lens and then acts on a workpiece to be welded, and the two wedge-shaped prisms are controlled to rotate through the rotating assembly. Dynamic change of light spots is accurately controlled, high-precision and high-quality welding is achieved, operation is convenient and fast, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of laser, specifically related to a kind of welding device of bi-directional rotation control light spot. BACKGROUND

[0002] At present, the method for controlling light spot movement of laser welding machine mainly has two kinds: one is to connect laser welding head on multi-axis mechanical arm to carry out mobile welding, and this welding mode needs to calibrate many positions for the welding of complex and changeable weld in small area, is tedious, time-consuming and laborious, and also needs to cooperate with the robot with high repeatability positioning accuracy, and simultaneously this kind of robot is expensive, and the corresponding manufacturing cost will be very high.Another method is to change the oscillation frequency of galvanometer by placing two swing motors loaded with reflecting mirror in X, Y dimension to control the movement track of light spot, such as "a kind of intelligent double swing welding head, CN202320784303.1".The motor used is current detection type motor, and the rotation angle of motor will change with input voltage.When the electromagnetic torque of rotation is balanced with restoring torque, motor is deflected to position, and the deflection angle at this time is proportional to input voltage, reflecting mirror is fixed on the rotating shaft of motor, high-speed swing of motor drives high-speed deflection of reflecting mirror, and then high-speed deflection of light beam is realized.This method for controlling light spot is flexible in operation and fast in response, but for high-power laser welding, especially laser welding above ten thousand watts, in order to reduce the power density of laser to prevent heat dissipation problem, mirror area often needs to be increased, and the high-power laser welding precision galvanometer system required by heavy reflecting mirror is expensive, and application cost is greatly improved.Therefore, finding laser welding system convenient in operation and low in cost is the problem to be solved for high-power laser welding, especially laser welding above ten thousand watts. CONTENT OF UTILITY MODEL

[0003] In view of the deficiencies in the background art, the utility model discloses a welding device of two-way rotation control light spot, including first wedge mirror rotating component, second wedge mirror rotating component, incident laser output component and compound focusing lens, the first wedge mirror rotating component includes first wedge prism and first rotation drive part, the first rotation drive part is used to drive the first wedge prism rotates around the first rotation drive part's first rotation axis, during the rotation, the first rotation axis with the first wedge prism's first rear surface keeps 45 degree angle, the second wedge mirror rotating component includes second wedge prism and second rotation drive part, the second rotation drive part is used to drive the second wedge prism rotates around the second rotation drive part's second rotation axis, during the rotation, the second rotation axis with the second wedge prism's second rear surface keeps 45 degree angle, the incident laser output component is used to provide incident laser to the first wedge prism, the first wedge prism reflects scanning reflected laser in the rotation process, the second wedge prism sets up at the first wedge prism's one side, the scanning reflected laser of the first wedge prism as the scanning incident laser of the second wedge prism, the second wedge prism reflects scanning output laser in the rotation process, the compound focusing lens sets up at the second wedge prism's one side, the compound focusing lens is used to receive the scanning output laser, and carries out focusing processing to the scanning output laser, to make the focused focusing scanning light beam act on the workpiece to be welded.

[0004] Further, the incident laser output component includes a laser output device and a compound collimating lens, the laser output device is used to output divergent laser, the compound collimating lens is arranged between the laser output device and the first wedge prism, and the compound collimating lens is used to collimate the divergent laser to provide parallel collimated incident laser for the first wedge prism.

[0005] Further, during the rotation, the incident angle of the incident laser on the first wedge prism varies between (45°+α1, 45°-α1), wherein α1 is the first wedge angle of the first wedge prism.

[0006] Further, the first rotation drive part is configured as a first servo motor, the first servo motor drives the first wedge prism to rotate in a first rotation direction at a first rotation speed, the second rotation drive part is configured as a second servo motor, the second servo motor drives the second wedge prism to rotate in a second rotation direction at a second rotation speed, and the first rotation direction is the same as or different from the second rotation direction.

[0007] Further, when the first rotation direction is the same as the second rotation direction, the first incident position of the incident laser on the first wedge-shaped prism remains unchanged, and the first incident angle of the incident laser on the first wedge-shaped prism changes with the rotation of the first wedge-shaped prism; the second incident angle and the second incident position of the scanning incident laser on the second wedge-shaped prism change with the rotation of the second wedge-shaped prism.

[0008] Further, when the first reflection surface of the first wedge-shaped prism is parallel to the second reflection surface of the second wedge-shaped prism, the incident laser forms an angle of 2*alpha1 with the second rotation axis.

[0009] Further, the composite collimating lens comprises a first collimating lens and a second collimating lens, the first collimating lens is a concave lens, the first collimating lens is used for generating negative spherical aberration, the second collimating lens is a double convex lens, the second collimating lens is used for generating positive spherical aberration, and the positive spherical aberration generated by the second collimating lens is used for compensating the negative spherical aberration generated by the first collimating lens.

[0010] Further, the composite focusing lens comprises a first focusing lens and a second focusing lens, the first focusing lens is a double convex lens, the second focusing lens is a plano-concave lens, and the second focusing lens is used for compensating spherical aberration generated by the first focusing lens.

[0011] Further, the laser output device is any one of a continuous fiber laser, a pulsed fiber laser and a semiconductor laser.

[0012] The beneficial effects of the utility model are as follows: (1) the rotation of the two wedge-shaped mirrors is controlled through the rotary driving part, the position, moving direction, moving path and moving speed of the light spot are accurately controlled, flexible welding path and light spot size are provided, the operation is convenient, and the welding precision and welding quality are high; (2) the rotary driving part with low price is selected to replace the traditional current detecting motor, and the cost of the high-power welding system is reduced; (3) the position and size of the welding light spot are controlled and adjusted through the rotation of the wedge-shaped mirror, so that the device can adapt to workpieces with different shapes and sizes, and the adaptability and welding efficiency of welding are improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below.

[0014] Fig. 1 It is the whole structure schematic diagram of the utility model embodiment;

[0015] Fig. 2is another structural schematic view of the embodiment of the utility model;

[0016] Fig. 3 is the light spot dynamic moving principle view of the embodiment of the utility model;

[0017] In the figure, 1-first wedge-shaped mirror rotating assembly, 11-first wedge-shaped prism, 12-first rotating driving part, 11a-first back surface, 11b-first reflecting surface;2-second wedge-shaped mirror rotating assembly, 21-second wedge-shaped prism, 22-second rotating driving part, 21a-second back surface, 21b-second reflecting surface;3-incoming laser output assembly, 31-laser output device, 32-composite collimating lens, 32a-first collimating lens, 32b-second collimating lens;4-composite focusing lens, 41-first focusing lens, 42-second focusing lens. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0019] A kind of welding device of bidirectional rotation control light spot, specifically, refer to Figs. 1-3The device comprises a first wedge-shaped mirror rotating assembly 1, a second wedge-shaped mirror rotating assembly 2, an incident laser output assembly 3 and a composite focusing lens 4. The first wedge-shaped mirror rotating assembly 1 comprises a first wedge-shaped prism 11 and a first rotating driving part 12, the first rotating driving part 12 is used to drive the first wedge-shaped prism 11 to rotate around the first rotating shaft of the first rotating driving part 12, and the first rotating shaft and the first back surface 11a of the first wedge-shaped prism 11 keep a 45° angle during the rotation. The second wedge-shaped mirror rotating assembly 2 comprises a second wedge-shaped prism 21 and a second rotating driving part 22, the second rotating driving part 22 is used to drive the second wedge-shaped prism 21 to rotate around the second rotating shaft of the second rotating driving part 22, and the second rotating shaft and the second back surface 21a of the second wedge-shaped prism 21 keep a 45° angle during the rotation. The incident laser output assembly 3 is used to provide incident laser to the first wedge-shaped prism 11, the light wedge angle of the first wedge-shaped prism 11 is selected as α1, the optical axis of the incident laser beam and the first back surface 11a of the first wedge-shaped prism 11 also keep a 45° angle, then the incident angle of the incident laser on the first reflecting surface 11b of the first wedge-shaped prism 11 is (45°+α1), the first rotating driving part 12 controls the first wedge-shaped prism 11 to rotate 360° around the first rotating shaft, and the first wedge-shaped prism 11 reflects and scans the reflected laser during the rotation. During the rotation of the first wedge-shaped prism 11, the incident angle of the incident laser beam on the first reflecting surface 11b gradually transitions from (45°+α1) to (45°-α1) and then to (45°+α1) again, so that the reflected scanning laser reflected by the first wedge-shaped prism 11 scans back and forth in a circular shape. The second wedge-shaped prism 21 is arranged on one side of the first wedge-shaped prism 11, the scanning reflected laser of the first wedge-shaped prism 11 is used as the scanning incident laser of the second wedge-shaped prism 21, the second wedge-shaped prism 21 reflects and scans the output laser during the rotation. The composite focusing lens 4 is arranged on one side of the second wedge-shaped prism 21, the composite focusing lens 4 is used to receive the scanning output laser and perform focusing processing on the scanning output laser, so that the focused focusing scanning beam acts on the workpiece to be welded. The light wedge angle of the second wedge-shaped prism 21 is α2, and α1 and α2 can be the same or different. By rotating the two wedge-shaped prisms, the position and moving track of the light spot on the workpiece to be welded are accurately controlled, which helps to accurately control the welding quality. By selecting the light wedge angle α1 of the wedge-shaped prism, the incident angle of the incident laser can be changed, and then the incident angle of the reflected scanning laser on the second wedge-shaped prism is adjusted, and finally the exit position of the focusing scanning laser is adjusted, so as to adapt to different welding requirements and improve the adaptability and welding efficiency of the welding. Meanwhile, the use of two rotating driving parts for rotating control in two directions increases the flexibility of the welding process and realizes the convenience of operation.

[0020] In a preferred embodiment, the first rotary drive 12 is configured as a first servo motor, the first servo motor drives the first wedge prism 11 to rotate in a first rotary direction at a first rotary speed, the second rotary drive 22 is configured as a second servo motor, the second servo motor drives the second wedge prism 21 to rotate in a second rotary direction at a second rotary speed, when the first rotary direction is the same as the second rotary direction, the first incident position of the incident laser on the first wedge prism 11 remains unchanged, always located at the center of the first reflecting surface 11b of the first wedge prism 11, the first incident angle of the incident laser on the first wedge prism 11 changes between (45°+α1, 45°-α1) with the rotation of the first wedge prism 11; the second incident angle and the second incident position of the scanning incident laser on the second wedge prism 21 change with the rotation of the second wedge prism 21, when the first rotary direction is different from the second rotary direction, that is, the two wedge prisms rotate in opposite directions, the output focused scanning laser forms a straight scanning track, when the first reflecting surface 11b of the first wedge prism 11 and the second reflecting surface 21b of the second wedge prism 21 are parallel to each other, the incident laser forms an angle of 2α1 with the second rotary shaft, by using a servo motor instead of a conventional current detecting motor, the cost of the welding device is reduced.

[0021] Further, the incident laser output assembly 3 includes a laser output device 31 and a composite collimating lens 32, the laser output device 31 can be configured as a continuous fiber laser, a pulsed fiber laser, a semiconductor laser and the like, the laser output device 31 is used to output divergent laser, the composite collimating lens 32 is arranged between the laser output device 31 and the first wedge prism 11, the composite collimating lens 32 includes a first collimating lens 32a and a second collimating lens 32b, the first collimating lens 32a is a concave lens, the first collimating lens 32a is used to generate negative spherical aberration, the second collimating lens 32b is a double convex lens, the second collimating lens 32b is used to generate positive spherical aberration, the positive spherical aberration generated by the second collimating lens 32b is used to compensate the negative spherical aberration generated by the first collimating lens 32a; the composite collimating lens 32 is used to collimate the divergent laser, so as to provide parallel collimated incident laser for the first wedge prism 11.

[0022] Further, the composite focusing lens 4 includes a first focusing lens 41 and a second focusing lens 42, the first focusing lens 41 is a double convex lens, the second focusing lens 42 is a plano-concave lens, the second focusing lens 42 is used to compensate the spherical aberration generated by the first focusing lens 41, the composite focusing lens 4 is used to focus the parallel scanning output laser beam at the corresponding focal point, so that the scanning beam has a higher power density.

[0023] In a preferred embodiment, with reference to Fig. 2, the laser output device 31 selects a continuous fiber laser, the output divergent laser beam quality BPP is controlled within 4.2mm x mrad, the virtual focal point is 48.5mm, a composite collimating lens 32 with a focal length of 150mm and an aperture of 2 inches is selected, the first collimating lens 32a selects a meniscus lens, the meniscus shape can reduce the damage of the returned light to the continuous fiber laser to a certain extent, the second collimating lens 32b selects a double convex lens, the positive spherical aberration generated by the double convex lens is used to offset the negative spherical aberration generated by the meniscus lens, the distance from the laser output head of the continuous fiber laser to the meniscus lens in the composite collimating lens 32 is 150-48.5=101.5mm, the divergence angle of the incident laser after collimating through the composite collimating lens 32 is controlled within 3mrad, the light aperture is 40mm, the first wedge prism 11 and the second wedge prism 21 with a diameter of 60mm are selected, preferably, the light wedge angle of the first wedge prism 11 is 30arcmin, the light wedge angle of the second wedge prism 21 is 40arcmin, the distance from the center of the first wedge prism 11 to the center of the second wedge prism 21 is H1, the distance from the center of the second wedge prism 21 to the first focusing lens 41 is H2, the focal length of the composite focusing lens 4 is F, due to the large spatter of the high-power welding laser, the focal length F is preferably set to 350mm, according to the requirement of the scanning width of the laser focal point on the workpiece surface, when the scanning width requirement is ±5mm, H1 is preferably set to 145mm, and H2 is preferably set to 77mm. It can be understood that the above data can be derived based on the following steps:

[0024] α1=30arcmin=0.5°=π / 180*0.5rad;

[0025] α1=5 / (H1+H2+F);

[0026] H1+H2+F=5 / α=5*360 / π=572.9mm;

[0027] α2=40arcmin=0.67°=π / 180*0.67rad;

[0028] α2=5 / (H2+F);

[0029] H2+F=5 / α2=5*270 / π=427.5mm;

[0030] F=350mm;

[0031] H1=145mm;

[0032] H2=77mm.

[0033] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A welding device for bi-directional rotation control of a light spot, characterized in that, The application relates to a laser welding device, which comprises a first wedge-shaped mirror rotating assembly (1), a second wedge-shaped mirror rotating assembly (2), an incident laser output assembly (3) and a composite focusing lens (4), the first wedge-shaped mirror rotating assembly (1) comprises a first wedge-shaped prism (11) and a first rotating driving element (12), the first rotating driving element (12) is used for driving the first wedge-shaped prism (11) to rotate around a first rotating shaft of the first rotating driving element (12), and the first rotating shaft and a first rear surface (11a) of the first wedge-shaped prism (11) keep a 45-degree angle during the rotating process; the second wedge-shaped mirror rotating assembly (2) comprises a second wedge-shaped prism (21) and a second rotating driving element (22), the second rotating driving element (22) is used for driving the second wedge-shaped prism (21) to rotate around a second rotating shaft of the second rotating driving element (22), and the second rotating shaft and a second rear surface (21a) of the second wedge-shaped prism (21) keep a 45-degree angle during the rotating process; the incident laser output assembly (3) is used for providing incident laser to the first wedge-shaped prism (11), the first wedge-shaped prism (11) reflects scanning reflected laser during the rotating process, the second wedge-shaped prism (21) is arranged on one side of the first wedge-shaped prism (11), the scanning reflected laser of the first wedge-shaped prism (11) is used as scanning incident laser of the second wedge-shaped prism (21), the second wedge-shaped prism (21) reflects scanning output laser during the rotating process, and the composite focusing lens (4) is arranged on one side of the second wedge-shaped prism (21), the composite focusing lens (4) is used for receiving the scanning output laser and performing focusing treatment on the scanning output laser, so that the focused focusing scanning light beam acts on a workpiece to be welded.

2. The dual rotation control spot welding apparatus of claim 1, wherein, The incident laser output assembly (3) comprises a laser output device (31) and a composite collimating lens (32), the laser output device (31) is used for outputting divergent laser, the composite collimating lens (32) is arranged between the laser output device (31) and the first wedge-shaped prism (11), and the composite collimating lens (32) is used for performing collimating treatment on the divergent laser to provide parallel collimated incident laser for the first wedge-shaped prism (11).

3. The dual rotation control spot welding apparatus of claim 1, wherein, During the rotating process, the incident angle of the incident laser on the first wedge-shaped prism (11) changes between (45°+alpha1, 45°-alpha1), wherein alpha1 is a first optical wedge angle of the first wedge-shaped prism (11).

4. The dual rotation control spot welding apparatus of claim 1, wherein, The first rotating driving element (12) is configured as a first servo motor, the first servo motor drives the first wedge-shaped prism (11) to rotate in a first rotating direction at a first rotating speed, the second rotating driving element (22) is configured as a second servo motor, and the second servo motor drives the second wedge-shaped prism (21) to rotate in a second rotating direction at a second rotating speed, the first rotating direction is the same as or different from the second rotating direction.

5. The dual rotation control spot welding apparatus of claim 4, wherein, When the first rotation direction is the same as the second rotation direction, a first incident position of the incident laser on the first wedge prism (11) remains unchanged, and a first incident angle of the incident laser on the first wedge prism (11) changes with the rotation of the first wedge prism (11); a second incident angle and a second incident position of the scanning incident laser on the second wedge prism (21) both change with the rotation of the second wedge prism (21).

6. The dual-rotation control spot welding apparatus of claim 5, wherein, When the first reflecting surface (11b) of the first wedge prism (11) and the second reflecting surface (21b) of the second wedge prism (21) are parallel to each other, the incident laser forms an angle of 2*α1 with the second rotation axis.

7. The dual rotation control spot welding apparatus of claim 2, wherein, The composite collimating lens (32) comprises a first collimating lens (32a) and a second collimating lens (32b), the first collimating lens (32a) is a concave lens, the first collimating lens (32a) is used for generating negative spherical aberration, the second collimating lens (32b) is a double convex lens, the second collimating lens (32b) is used for generating positive spherical aberration, and the positive spherical aberration generated by the second collimating lens (32b) is used for compensating the negative spherical aberration generated by the first collimating lens (32a).

8. The dual-rotation control spot welding apparatus of claim 1, wherein, The composite focusing lens (4) comprises a first focusing lens (41) and a second focusing lens (42), the first focusing lens (41) is a double convex lens, and the second focusing lens (42) is a plano-concave lens, the second focusing lens (42) is used for compensating spherical aberration generated by the first focusing lens (41).

9. The dual rotational control spot welding apparatus of claim 2, wherein, The laser output device (31) is any one of a continuous fiber laser, a pulsed fiber laser and a semiconductor laser.

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