CN112620937A - Light beam rotary welding working head - Google Patents

Light beam rotary welding working head Download PDF

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Publication number
CN112620937A
CN112620937A CN202011157562.9A CN202011157562A CN112620937A CN 112620937 A CN112620937 A CN 112620937A CN 202011157562 A CN202011157562 A CN 202011157562A CN 112620937 A CN112620937 A CN 112620937A
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Prior art keywords
laser
hollow shaft
welding
motor
wedge
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CN202011157562.9A
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Chinese (zh)
Inventor
肖荣诗
阎帅
武强
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Beijing University of Technology
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Beijing University of Technology
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Priority to CN202011157562.9A priority Critical patent/CN112620937A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment

Abstract

The invention relates to a light beam rotary welding working head, which is suitable for laser welding of metal materials and belongs to the field of laser welding. The laser transmission, deflection and focusing device and the motor transmission shaft are coaxially designed, the motor transmission shaft is designed into a hollow shaft which integrates a driving shaft capable of realizing laser focus rotation and a space transmission shaft for carrying out laser transmission, deflection and focusing, a transmission device between the motor driving shaft and a laser deflection part is eliminated, the integrated design of the motor driving shaft and a laser beam transmission, deflection and focusing transmission device is completed, the laser focus rotation zero transmission is realized, and the design of a zero transmission integrated laser focus rotation welding head is realized by integrating laser welding key components such as a laser deflection mirror group, a focusing mirror, a welding nozzle, a corssjet and the like. The invention also inhibits the thermal lens effect of the laser in the hollow shaft through related design, improves the safety and stability, and greatly reduces the volume and the weight.

Description

Light beam rotary welding working head
Technical Field
The invention relates to a light beam rotary welding working head, in particular to a zero-transmission integrated laser focus rotary welding working head, which is suitable for laser welding of metal materials and belongs to the technical field of laser welding.
Background
Laser welding, as a typical laser manufacturing process, has the advantages of small heat input, high energy density, large depth-to-width ratio of a welding seam, high welding speed, flexible beam transformation and the like, and is widely applied in the industrial field.
For laser deep melting welding, particularly for aluminum alloy materials, the problems of poor welding stability and many welding air holes often occur. During laser deep melting welding, due to the fact that aluminum alloy is low in viscosity and surface tension, a deep melting small hole formed under the action of laser is unstable, and is easy to shrink and collapse, the welding process is unstable, the welding seam surface is poor in forming, severe in splashing and large in pore tendency, and industrial application of aluminum alloy laser welding is restricted.
In order to improve the stability of the laser welding process, many scholars fully utilize the flexibility of laser beam transformation and action and provide some new welding methods by changing the action mode of the laser beam besides optimizing the welding process parameters. The method of beam rotation or oscillation is firstly proposed to reduce the assembly gap precision of laser butt welding and improve the process redundancy. This method was also later used to improve the stability of the laser welding process and reduce weld porosity. Research shows that the focus rotating or swinging method can enlarge deep melting small holes, regulate and control small holes and molten pool behaviors, and play roles in stabilizing the welding process, improving weld formation and reducing air holes and splashing. Further research on a focus rotating welding method shows that different welding seam appearances can be obtained by different rotating radiuses; when the radius of rotation is increased to a certain extent, the laser welding behavior will change from a deep-melt welding to a thermal-conductive welding. Therefore, by adjusting the rotating radius of the laser focus, the welding process can be stabilized by reducing welding pores, and the effects of regulating and controlling the appearance of a welding seam and changing a welding mode can be achieved. The applicant's prior invention patent "a laser welding apparatus with a rotary focal point and vertical vibration" (patent No. ZL201510907252.7) discloses a method for controlling the radius of rotation of the focal point, which uses the refraction effect of a single wedge mirror with different inclination angles, in combination with the focusing effect of a focusing lens, to obtain different radii of rotation of the focal point of the laser; the rotation of the high-speed motor is transmitted to the wedge-shaped mirror through the mechanical transmission device, the high-frequency rotation of the focused light beam is obtained, and different laser welding effects are obtained by combining welding process parameters and rotation parameters.
At present, high-speed rotation of the focused laser is basically achieved by using a galvanometer drive and the above-mentioned mechanical transmission device. The galvanometer has larger volume, high price and smaller laser movement stroke; if it is installed on the manipulator/machine tool, it is necessary to integrate the galvanometer specific software with the machine tool/manipulator CNC software. Although the method of converting the rotation of the high-frequency motor into the high-frequency rotation of the wedge-shaped mirror by using the mechanical transmission device can realize the high-frequency rotation of the focused light beam, the transmission device has high rotation speed, and the transmission device is driven by gears or belts, so that the noise is high, the abrasion of transmission parts is serious, and particularly, the extremely high circumferential linear velocity of transmission parts (gears or toothed belts) caused by the high-frequency rotation (100-300 Hz) of the transmission parts brings great potential safety hazards to equipment operation and operators. In addition, since the high-speed motor and the laser transmission focusing device are distributed at two ends of the transmission device (the motor is positioned at the driving end, and the laser transmission focusing device is positioned at the driven end), the focusing focus rotating device is inevitably large in size and heavy, the welding head is not beneficial to being integrally installed at the tail end of a mechanical arm/machine tool, and the industrial application of the laser focus rotating process is restricted.
Therefore, in order to meet the requirements of compact and reliable operation and industrial application of the laser focus rotary welding device, it is necessary to develop an integrated laser focus rotary welding head with compact structure and high operation reliability.
Disclosure of Invention
The invention aims to provide a light beam rotary welding working head which can realize horizontal rotation of a laser beam focus and is integrated with zero transmission.
The technical scheme of the invention is as follows.
A light beam rotary welding working head comprises a light deflection mirror group, a focusing lens and a motor;
the light deflecting mirror group can adjustably deflect the incident quasi-parallel light beam;
the focusing lens can focus the deflected incident parallel light beams on a laser focus at a rotating radius set from an optical axis;
the motor comprises a motor main body, a stator and a hollow shaft; the stator is connected with the motor main body; the hollow shaft comprises a rotor part and a driving part; the rotor portion is formed integrally with the drive portion and is rotatable relative to the stator.
Preferably, the light deflecting mirror group is mounted on a driving portion of the hollow shaft and is disposed coaxially with the incident quasi-parallel light laser beam, the hollow shaft, and the focusing lens; the hollow shaft can drive the light deflection mirror group to rotate, so that the laser focus rotates around the optical axis at the offset radius;
the inner diameter D of the hollow shaft is more than or equal to 1.2 omega0，ω0Is the incident quasi-parallel beam waist diameter.
Preferably, the upper part of the motor main body is provided with a motor upper flange and a laser connecting seat, and the lower part of the motor main body is provided with a motor lower flange;
the laser connecting seat is rigidly connected with the upper flange of the motor; the laser connecting seat is provided with a light through hole coaxial with the hollow shaft and a water cooling pipeline surrounding the light through hole, so that connection of an input laser light guide device is achieved, and the heating effect of the parallel light diffraction effect on the hollow shaft is eliminated.
Preferably, an air inlet groove is further formed in the laser connecting seat; the lower flange of the motor is provided with a gas overflow hole, so that the laser thermal lens effect generated when the incident quasi-parallel light beam is transmitted in the hollow shaft is eliminated.
Preferably, the focusing lens is fixed in a focusing lens seat by a focusing lens pressing ring, and the focusing lens seat is rigidly connected with a lower flange of the motor, is positioned below the light deflecting mirror group and is concentric with the hollow shaft.
Preferably, a welding nozzle is installed at the lower end of the focusing lens base, and a cross jet air curtain is integrally arranged on the welding nozzle; the cross air curtain of the crossjet and the welding nozzle are kept fixed when the hollow shaft rotates at high speed.
Preferably, the light deflecting mirror group comprises an upper wedge mirror and a lower wedge mirror; the upper wedge-shaped mirror is arranged on the end face in the hollow shaft and is fixed through an upper wedge-shaped mirror pressing ring; the lower wedge-shaped mirror is fixed in the lower wedge-shaped mirror mounting seat and is fixed through a lower wedge-shaped mirror press ring; the lower wedge-shaped mirror mounting seat is connected with the hollow shaft through a lower wedge-shaped mirror mounting seat adjusting thread;
the adjustable relative rotation angle is formed between the upper wedge-shaped mirror and the lower wedge-shaped mirror, and the deflection angle of the incident quasi-parallel light beam can be adjusted by adjusting the relative rotation angle, so that the rotation radius is adjusted.
Preferably, the transmission power of the laser is 500W to 8000W.
Preferably, the laser is CO2Laser, semiconductor laser, and fiber laser.
Preferably, the rotation frequency of the laser focus is 25Hz to 500 Hz.
Based on the technical scheme, the laser transmission, deflection and focusing device and the high-frequency motor transmission shaft are coaxially designed by optimizing laser transmission, deflection and focusing parameters, the high-frequency motor transmission shaft is integrally designed into the laser focus rotating driving shaft and the laser transmission, deflection and focusing space transmission shaft, a transmission device between the motor driving shaft and the laser deflection device is eliminated, and the laser focus rotating zero transmission is realized on the basis of realizing the laser focus rotating zero transmission. The design of the zero-transmission integrated laser focus rotary welding head is realized through the integrated design of the motor driving shaft integrating laser welding key components such as the laser deflection mirror group, the focusing mirror, the welding nozzle, the corssjet and the like and the transmission, deflection and focusing of laser beams. The invention also inhibits the thermal lens effect in the transmission of the laser in the hollow shaft through related design, thereby not only improving the motion safety and stability of the device, but also reducing the volume and weight. The zero-transmission integrated design scheme not only improves the running performance of the welding head, but also meets the integration requirement of a manipulator/machine tool system, and widens the industrial application range of the focus rotary welding process.
Drawings
FIG. 1 is a schematic diagram of the working of a beam spin welding head of the present invention.
Fig. 2 is a partially enlarged view of fig. 1.
FIG. 3 is a schematic structural diagram of a beam spin welding head according to the present invention.
Fig. 4 is a partially enlarged view of fig. 3.
Wherein: 1. the laser welding device comprises a quasi-parallel light beam, 2 parts of a hollow shaft, 2-1 parts of a vent groove, 3 parts of a motor body, 4 parts of a motor stator, 5 parts of a rotor, 6 parts of an upper wedge-shaped mirror, 6-1 parts of an upper wedge-shaped mirror press ring, 7 parts of a lower wedge-shaped mirror, 7-1 parts of a lower wedge-shaped mirror press ring, 8 parts of a deflection quasi-parallel light beam, 9 parts of a focusing lens, 9-1 parts of a focusing lens press ring, 10 parts of a focusing light beam, 11 parts of a welding nozzle, 12 parts of a workpiece, 13 parts of a welding seam, 14 parts of a cross gas curtain, 15 parts of an input laser connecting seat, 16 parts of a collimating unit, 17 parts of an optical fiber, 18 parts of a motor upper flange, 19 parts of an upper ceramic ball bearing, 20 parts of a lower ceramic ball bearing, 21 parts of a gas overflow hole, 22 parts of a motor lower flange, 23 parts of a focusing lens seat, 24 parts of a wedge-shaped. D: inner diameter of hollow shaft, omega0: beam waist diameter, phi, of quasi-parallel beams1: inputting the diameter of a light through hole of the laser connecting seat, and v is the welding speed direction.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Fig. 1 is a simplified schematic diagram of a zero-transmission integrated laser focus rotary welding head according to the present invention, which is only used for explaining the working principle of the welding head of the present invention, and the specific mechanical structure is shown in fig. 2.
The zero-transmission integrated laser focus rotary welding working head mainly comprises a light deflection mirror group, a motor, a focusing lens 9, a crossjet transverse air curtain 14 and a welding nozzle 11.
The light deflection mirror group comprises an upper wedge mirror 6 and a lower wedge mirror 7, the upper wedge mirror 6 is rigidly mounted in the hollow shaft 2, and the lower wedge mirror 7 is mounted in a wedge mirror mounting seat 24 and connected with the hollow shaft 2 through threads 24-1. The relative rotation angle of the upper wedge-shaped mirror 6 and the lower wedge-shaped mirror 7 can be adjusted, and the upper wedge-shaped mirror and the lower wedge-shaped mirror rotate with the hollow shaft 2 at high speed when the welding working head works. Wherein, the axes of the upper wedge-shaped mirror 6, the lower wedge-shaped mirror 7, the focusing mirror 9 and the hollow shaft 2 are superposed.
The motor mainly comprises a hollow shaft 2, a motor main body 3 and a stator 4, and is coaxially mounted. Wherein the hollow shaft 2 includes a rotor portion 5 and a drive portion, the rotor portion 5 being formed integrally with the drive portion and being rotatable with respect to the stator 4. It can be understood by those skilled in the art that although the rotor portion 5 of the hollow shaft 2 and the driving portion are shown in fig. 2 as a single body, the present invention is not limited thereto, and the rotor portion 5 of the hollow shaft 2 and the driving portion may be directly and integrally formed.
A quasi-parallel laser beam 1 is transmitted from a hollow shaft 2. The hollow shaft 2 can carry an upper wedge mirror 6 and a lower wedge mirror 7 in rotation, so that the laser focus rotates around the optical axis at the offset radius. The inner diameter D of the hollow shaft 2 is more than or equal to 1.2 omega0，ω0The diameter of the beam waist of the incident quasi-parallel beam 1. In the laser transmission direction, the focusing mirror 9 is arranged below the lower wedge-shaped mirror 7 and does not rotate along with the hollow shaft 2 during operation. A welding nozzle 11 is arranged below the focusing mirror 9 and used for protecting a welding seam 13, and meanwhile, a cross air curtain 14 is integrated on the welding nozzle 11 and used for preventing welding spatter from polluting the focusing mirror 9. Through the design, the high-speed rotation of the laser beam is realized by directly utilizing the high-speed rotation of the motor, the zero transmission device design is realized, and the integrated design of a rotary welding head is realized. In order to inhibit the laser thermal lens effect generated by the transmission of laser beams in the whole device and reduce the temperature rise effect caused by the transmission of the laser beams to the whole device, an air inlet groove 15-1 is processed on an input laser connecting seat 15, an air vent groove 2-1 is processed at the lower end of a hollow shaft 2, and a gas overflow hole 21 is processed on a lower flange of a motor; at the same timeThe water cooling pipeline 15-1 is processed in the input laser connecting seat 15, so that the temperature rise effect of the diffraction effect of the laser beam generated at the port of the hollow shaft 2 on the input laser connecting seat 15 is weakened, the heat dissipation pressure of the whole device is reduced, and the integrated design and safe and reliable operation of the rotary welding head are realized.
The principle of continuous adjustment of the radius of rotation of the laser focus is shown in the enlarged detail of fig. 2.
The wedge angle of the two wedge-shaped mirrors is theta, the focal length of the focusing lens is f, and the relative rotation angle of the two wedge-shaped mirrors is beta (beta is more than 0 degree and less than 360 degrees). The relative rotation angle β of the two wedge mirrors is defined as follows: when the symmetrical center lines (the center lines which connect the highest point and the lowest point of the wedge-shaped mirrors in the thickness direction and pass through the circle centers of the wedge-shaped mirrors) of the two wedge-shaped mirrors are in the same plane, and the highest point and the lowest point of the two wedge-shaped mirrors in the thickness direction are both positioned on the same side of the axis of the focusing mirror, the rotation angle of the two wedge-shaped mirrors is defined to be 0 degree; when the symmetrical center lines (the center lines connecting the highest point and the lowest point in the thickness direction of the wedge-shaped mirrors and passing through the circle center of the wedge-shaped mirrors) of the two wedge-shaped mirrors are in the same plane and the highest point and the lowest point in the thickness direction of the two wedge-shaped mirrors are respectively positioned at two sides of the axis of the focusing mirror, the rotation angle of the two wedge-shaped mirrors is defined to be 180 degrees. The rotation angle beta of the two wedge-shaped mirrors can be continuously changed through the adjustment of related parts.
The quasi-parallel laser beam 1 passes through an upper wedge-shaped mirror 6 and a lower wedge-shaped mirror 7 to form a deflected quasi-parallel light 8, and the deflection angle of the deflected quasi-parallel light 8 is determined by the wedge angle of the wedge-shaped mirrors and the relative rotation angle of the two wedge-shaped mirrors.
From the deflection characteristics of the wedge-shaped mirrors, the incidence angle δ (the angle between the axis of the quasi-parallel light and the axis of the incident quasi-parallel light) of the polarized and refracted quasi-parallel light 1 incident on the focusing lens, the wedge tilt angle θ, the wedge refractive index n, and the relative rotation angle β of the two wedge-shaped mirrors have the following relations:
Figure BDA0002743230870000081
the focus of the laser is set to be on the surface of the workpiece 12, and the offset r of the focus from the central point (the intersection point of the quasi-parallel optical axis or the hollow axis and the surface of the workpiece) is as follows according to the geometric optics correlation formula:
r＝f*tanδ (1)
where f is the focal length of the focusing lens 9, and δ is the angle between the axis of the focused beam and the axis of the focusing lens 9.
The relation between the offset radius r and the relative rotation angle beta obtained from (1) and (2) is
Figure BDA0002743230870000082
Since δ is extremely small, the formula can be simplified to
Figure BDA0002743230870000083
From this equation, it follows:
when β is 0 °, r is 2f (n-1) θ, which is the maximum offset distance;
when β is 180 °, r is 0, and the laser beam converges to a central point. By continuously adjusting the value of beta, the continuous adjustment of the rotating radius r of the laser focus can be realized.
An integrated welding working head device with continuously adjustable focal point rotation radius is described below by taking fiber laser as an example and adopting a coaxial welding nozzle, and the specific structure is shown in fig. 2.
First, the fiber laser beam transmitted through the optical fiber 15 is expanded by the collimating unit 16 to obtain quasi-parallel light 1, and the quasi-parallel light 1 is input into the hollow shaft 2. An upper ceramic ball bearing 19 and a lower ceramic ball bearing 20 are arranged in the motor main body 3 and used for fixedly mounting the hollow shaft 2. Then, two upper wedge-shaped mirrors 6 and lower wedge-shaped mirrors 7 with the same wedge angle and a wedge-shaped mirror mounting seat 24 are installed below the hollow shaft 2, so that the deflection of the quasi-parallel light 1 is realized. The focusing lens 9 is fixed in the focusing lens seat 23 by a focusing lens press ring 9-1 and is arranged below the integrated welding working head device to realize the focusing of light beams. A lower flange 22 is arranged below the motor body 3, a focusing mirror seat 23 is arranged in the lower flange 22, and the focusing mirror seat 23 is rigidly connected with the lower flange 22 through screws. Wherein, the axes of the upper wedge-shaped mirror 6, the lower wedge-shaped mirror 7, the focusing mirror 9 and the hollow shaft 2 are superposed. The lower part of the focusing lens seat 23 is connected with a welding nozzle 11 through a nozzle connecting frame 25, and the action position of the output gas of the welding nozzle 11 and the workpiece 12 covers the area around the laser focus. The welding nozzle 11 outputs inert gas to control welding plume/plasma and protect a molten pool, and welding quality is guaranteed. And a cross air curtain 14 is integrated on the welding nozzle 11, so that the pollution of welding spatter to the focusing lens is eliminated.
Aiming at the characteristics of the optical fiber laser wavelength, selecting the materials of an upper wedge-shaped mirror 6 and a lower wedge-shaped mirror 7 as quartz, wherein n is 1.44, and theta is 0.391 degrees; the focusing lens 9 is made of quartz, n is 1.44, and is plated with an antireflection film, and the focal length f is 300 mm. The maximum radius of rotation r was 1.8mm as calculated by the formula (4). Therefore, when the relative angle beta of the two mirrors is changed from 0 DEG to 180 DEG, the continuous change of the focal point rotation radius of 0-1.8 mm can be obtained.
The working principle of the continuous adjusting device for the rotating radius of the laser focus is shown in an enlarged view in figure 2.
An upper wedge-shaped mirror 6 is arranged at the lower end of the hollow shaft 2 and is fixed through an upper wedge-shaped mirror pressing ring 6-1; the lower wedge-shaped mirror 7 is fixed in the lower wedge-shaped mirror mounting seat 24 and is fixed through the lower wedge-shaped mirror pressing ring 7-1. The lower wedge mirror mounting seat 24 is connected with the hollow shaft 2 through a lower wedge mirror mounting seat adjusting thread 24-1, and the lower wedge mirror mounting seat 24 is rigidly fixed with the hollow shaft 2 through a jackscrew in a jackscrew hole 26. When the welding working head works, the phase angle between the upper wedge-shaped mirror and the lower wedge-shaped mirror is adjusted through the adjusting thread 24-1 of the mounting seat of the lower wedge-shaped mirror, the output of the parallel light beams 8 with different deflection is obtained, and the high-speed rotation of the laser focusing light beams 10 with different rotating radiuses is realized by combining the focusing function of the focusing lens 9 and the high-speed rotation of the hollow shaft 2. The continuous adjustment of the frequency converter can obtain the continuous adjustment of the rotating frequency by matching the driving of the high-frequency motor, and the deep melting welding and the thermal conduction welding can be realized by combining different focal point rotating radiuses.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A light beam rotary welding working head comprises light deflection mirror groups (6, 7), a focusing lens (9) and a motor;
the light deflecting mirror group (6, 7) is capable of adjustably deflecting the incoming quasi-parallel light beam (1);
the focusing lens (9) can focus the deflected incident parallel light beams on a laser focus at a rotating radius set from an optical axis;
the motor comprises a motor main body (3), a stator (4) and a hollow shaft (2); the stator (4) is connected with the motor main body (3); the hollow shaft (2) comprises a rotor part (5) and a driving part; the rotor portion is formed integrally with the drive portion and is rotatable relative to the stator (4).
2. A beam spin welding working head according to claim 1, characterized in that the set of light deflecting mirrors (6, 7) is mounted in the driving part of the hollow shaft (2) and is arranged coaxially with the incident quasi-parallel light laser beam (1), the hollow shaft (2) and the focusing lens (9); the hollow shaft (2) can drive the light deflection mirror group (6, 7) to rotate, so that the laser focus rotates around the optical axis at the offset radius;
the inner diameter D of the hollow shaft (2) is more than or equal to 1.2 omega0，ω0Is the beam waist diameter of the incident quasi-parallel beam (1).
3. A beam spin welding work head as claimed in claim 1 wherein the upper part of the motor body has a motor upper flange (18) and a laser connection socket (15), and the lower part of the motor body has a motor lower flange (22);
the laser connecting seat (15) is rigidly connected with the upper flange (18) of the motor; the laser connecting seat (15) is provided with a light through hole (15-3) coaxial with the hollow shaft (2) and a water cooling pipeline (15-1) surrounding the light through hole (15-3), so that connection of an input laser light guide device is achieved, and the heating effect of a parallel light diffraction effect on the hollow shaft is eliminated.
4. A beam rotary welding work head according to claim 3, characterized in that the laser connecting seat (15) is further provided with an air inlet groove (15-2); the motor lower flange (22) is provided with a gas overflow hole (21), so that the laser thermal lens effect generated when the incident quasi-parallel light beam (1) is transmitted in the hollow shaft (2) is eliminated.
5. A beam spin welding work head according to claim 3, characterized in that the focusing lens (9) is fixed in a focusing lens holder (23) by a focusing lens clamping ring (9-1), the focusing lens holder (23) being rigidly connected to the lower motor flange (22), being located below the set of light deflecting mirrors (6, 7), and being concentric to the hollow shaft (2).
6. A beam rotary welding work head as claimed in claim 5, characterized in that the lower end of the focusing lens holder (23) is provided with a welding nozzle (11), and a cross jet transverse air curtain (14) is integrally arranged on the welding nozzle (11); the cross air curtain (14) and the welding nozzle (11) are kept fixed when the hollow shaft (2) rotates at high speed.
7. A beam spin welding work head according to claim 1, characterized in that the set of light deflecting mirrors (6, 7) comprises an upper wedge mirror (6) and a lower wedge mirror (7); the upper wedge-shaped mirror (6) is arranged on the end face in the hollow shaft (2) and is fixed through an upper wedge-shaped mirror pressing ring (6-1); the lower wedge-shaped mirror (7) is fixed in the lower wedge-shaped mirror mounting seat (24) and is fixed through a lower wedge-shaped mirror press ring (7-1); the lower wedge-shaped mirror mounting seat (24) is connected with the hollow shaft (2) through a lower wedge-shaped mirror mounting seat adjusting thread (16-1);
an adjustable relative rotation angle is formed between the upper wedge-shaped mirror (6) and the lower wedge-shaped mirror (7), and the deflection angle of the incident quasi-parallel light beam (1) can be adjusted by adjusting the relative rotation angle, so that the rotation radius is adjusted.
8. A beam spin welding work head as in any of the claims 1 to 7 wherein the laser has a transmission power of 500W to 8000W.
9. A beam spin welding head as claimed in any one of claims 1 to 7, wherein the laser is CO2Laser, semiconductor laser, and fiber laser.
10. A beam spin welding work head as claimed in any one of claims 1 to 7 wherein: the rotating frequency of the laser focus is 25 Hz-500 Hz.
CN202011157562.9A 2020-10-26 2020-10-26 Light beam rotary welding working head Pending CN112620937A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN202011157562.9A CN112620937A (en) 2020-10-26 2020-10-26 Light beam rotary welding working head

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114393301A (en) * 2022-01-19 2022-04-26 湘潭大学 Real-time deflection laser welding method based on double MEMS (micro-electromechanical systems) measuring instruments

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114393301A (en) * 2022-01-19 2022-04-26 湘潭大学 Real-time deflection laser welding method based on double MEMS (micro-electromechanical systems) measuring instruments
CN114393301B (en) * 2022-01-19 2024-01-26 湘潭大学 Real-time deflection laser welding method based on double MEMS (micro-electromechanical systems) manufacturing and measuring instrument

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