JP4395217B2 - Composite head for laser welding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite head for laser welding provided with a plurality of fibers for guiding a laser beam for welding and a plurality of condensing systems for irradiating a workpiece with the laser beam inside a head body.
[0002]
[Prior art]
Referring to FIG. 9, a laser welding head 101 is conventionally provided with a pair of optical transmission fiber 103 and a condensing system 105. For this reason, in the welding application 107 that irradiates the material by superimposing the pulse laser PL and the continuous laser CL, the pulse laser PL and the continuous laser CL are incident on one optical transmission fiber 103 in advance inside or outside the laser oscillator 109. is doing.
[0003]
[Problems to be solved by the invention]
However, in such a conventional technique, since the pulse laser PL and the continuous laser CL have to be incident on one optical transmission fiber 103 in advance, a complicated incident unit 111 must be provided, and the structure becomes complicated. There is also a problem in terms of cost.
[0004]
In addition, since the condensing optical component 105 is commonly used for the pulse laser PL and the continuous laser CL, any important condition for applications such as changing the focal spot diameter and the position relative to the weld line for each laser can be arbitrarily set. There is a problem that it cannot be set.
[0005]
An object of the present invention has been made by paying attention to the conventional techniques as described above, and provides a composite head for laser welding capable of arbitrarily setting a spot diameter and a spot position and performing accurate welding. There is.
[0006]
[Means for Solving the Problems]
The present invention has been made in view of the above-described conventional problems. The laser beam oscillated by a laser oscillator is guided to a condensing system provided in the head body via an optical fiber, and the laser beam is welded to a workpiece. A laser welding composite head for condensing and welding at a point, a continuous laser optical fiber (3) for transmitting a continuous laser oscillated by a laser oscillator, and a pulse laser for transmitting a pulse laser And an optical fiber for a continuous laser (9) connected to the optical fiber for a continuous laser (3) and the optical fiber for a pulse laser. A condensing system for pulse laser (11) connected to (5) is separately provided in the head main body (2) and the condensing system for continuous laser (19) and the pulse laser are used. Spot diameter of the light system (11), is characterized in that are arbitrarily settable configured spot position.
[0007]
The laser welding composite head further includes a filler supply nozzle (15) for supplying a welding filler (13) to the welding point (YP) at the center of the head body (2), The imaging means (27) for imaging the welding point (YP) on (W), the continuous laser condensing system (9), and the pulse laser condensing system (11) include the filler supply nozzle (15). It is characterized by being arranged at equal intervals around
[0008]
The composite head for laser welding includes a filler supply nozzle (15) for supplying a filler (13) for welding to the welding point (YP) at the center of the head body (2) and the workpiece. (W) provided with imaging means (27) for imaging the welding point (YP), and a plurality of the continuous laser condensing systems (19) are arranged at symmetrical positions with the center of the head body (2) as the center. The imaging means (27) and the pulse laser focusing system (11) are provided at symmetrical positions, and the plurality of continuous laser focusing systems (19) and the pulse laser focusing system ( 11) and the imaging means (27) are arranged at equal intervals around the filler supply nozzle (15), respectively .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0017]
FIG. 1 shows a composite head 1 for laser welding according to the present invention. The head main body 2 of the laser welding composite head 1 includes a continuous laser optical fiber 3 for transmitting a continuous laser oscillated by a laser oscillator (not shown) and a pulse laser optical fiber 5 for transmitting a pulse laser. Is connected. Further, a supply port 7 for supplying the shield gas G to the head body 2 during welding is provided.
[0018]
Inside the head body 2, a continuous laser condensing system 9 connected to the continuous laser optical fiber 3 and a pulse laser condensing system 11 connected to the pulse laser optical fiber 5 are provided. In the center of the head body 2, a filler supply nozzle 15 for supplying the filler 13 to the welding point YP is provided.
[0019]
In the continuous laser condensing system 9 and the pulse laser condensing system 11, collimating lenses 19 and 21 and condensing lenses 23 and 25 are provided inside the holder 17, respectively. Each of them can be moved up and down independently along the holder 17 by a focus adjusting mechanism (not shown).
[0020]
In the head body 2, a CCD camera unit 27 (see FIG. 2), which is an example of an imaging unit that images the welding point YP on the workpiece W at a position substantially coaxial with the laser beam LB, is provided.
[0021]
Accordingly, the laser beam LB transmitted by the continuous laser optical fiber 3 or the pulse laser optical fiber 5 is collimated by the collimating lenses 19 and 21 and further collected at the welding point YP of the workpiece W by the condenser lenses 23 and 25. The filler 13 supplied by the filler supply nozzle 15 is melted and welded. At this time, the continuous laser CL and the pulse laser PL are irradiated with their focal points adjusted separately by the condenser lenses 23 and 25, respectively.
[0022]
Next, a layout example in the head main body 2 of the laser welding composite head 1 is shown.
[0023]
Referring to FIG. 2, in this laser welding composite head 29, a filler supply nozzle 15 is arranged in the center, and a continuous laser condensing system 9, a pulse laser condensing system 11, and a CCD are arranged around the filler nozzle 15 at 120 ° intervals. A camera unit 27 is provided.
[0024]
Further, referring to FIG. 3, in this laser welding composite head 31, a filler supply nozzle 15 is arranged at the center, and a pair of continuous laser condensing systems 9 are arranged at symmetrical positions with respect to the filler supply nozzle 15. In addition, a pulse laser condensing system 11 and a CCD camera unit 27 are arranged between the condensing systems 9 and 9 for both continuous lasers.
[0025]
Further, referring to FIG. 4, in this laser welding composite head 33, a filler supply nozzle 15 is disposed in the center, and a continuous laser condensing system 9 is provided at a position that divides the periphery of the filler supply nozzle 15 into six equal parts. A pulse laser condensing system 11 and a CCD camera unit 27 are provided as appropriate.
[0026]
Next, a method of irradiating the laser beam LB by the laser welding composite heads 1, 29, 31, and 33 will be described.
[0027]
Referring to FIG. 5, a pulse laser PL is irradiated with a small diameter to the welding point YP position of the workpiece W, and a continuous laser CL is irradiated with a large diameter including the pulse laser PL as a center. Or conversely, it is possible to irradiate the welding point position of the workpiece W with the continuous laser CL with a small diameter and irradiate the pulse laser PL with a large diameter including the continuous laser CL as the center.
[0028]
In addition, referring to FIG. 6, the pulse laser PL and the continuous laser CL can be irradiated to the welding point YP position having the same diameter and the same position.
[0029]
Alternatively, as shown in FIG. 7, a continuous laser CL1 for preheating, a pulse laser PL for penetration, and a continuous laser CL2 for afterheating may be sequentially irradiated with the same diameter in the welding direction. .
[0030]
Furthermore, as shown in FIG. 8, it is possible to deal with a case where the welding gap is large by irradiating the welding point YP with the pulse laser PL and irradiating four continuous lasers CL around it.
[0031]
From the above results, the optical fibers 3 and 5 and the condensing systems 9 and 11 are independently incorporated into the head body 2 as a pair so that the pulse laser PL and the continuous laser CL can be placed at arbitrary positions and at arbitrary spot diameters. It can be condensed. Along with this, a plurality of independent laser outputs can be utilized.
[0032]
Further, by providing the filler supply nozzle 15 at the center, restrictions on the welding progress direction and the welding posture are eased in filler supply welding, so that workability can be improved.
[0033]
Further, by providing the CCD camera unit 27 in the head main body 2, the welding point YP can be captured as an image from almost the irradiation position of the laser beam LB, so that the teaching and the welding line can be confirmed very accurately. .
[0034]
The present invention is not limited to the embodiment of the invention described above, and can be implemented in other modes by making appropriate modifications.
[0035]
【The invention's effect】
As described above, by the present invention lever, since continuous laser and the laser pulse is emitted independently in the work, it is possible to arbitrarily set the size of the spot diameter, to improve the welding function Can do.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a laser welding composite head according to the present invention.
FIG. 2 is a plan view showing an example of a layout of a continuous laser, a pulse laser, and a CCD camera unit.
FIG. 3 is a plan view showing another example of a layout of a continuous laser, a pulse laser, and a CCD camera unit.
FIG. 4 is a plan view showing still another example of a layout of a continuous laser, a pulse laser, and a CCD camera unit.
FIG. 5 is a plan view showing an example of an irradiation application of a continuous laser and a pulse laser.
FIG. 6 is a plan view showing another example of an irradiation application of a continuous laser and a pulse laser.
FIG. 7 is a plan view showing still another example of irradiation application of a continuous laser and a pulse laser.
FIG. 8 is a plan view showing still another example of irradiation application of a continuous laser and a pulse laser.
FIG. 9 is a schematic view showing a conventional laser processing head.
[Explanation of symbols]
1, 29, 31, 33 Laser welding composite head 2 Head body 3, 5 Fiber 9, 11 Condensing system 15 Filler supply nozzle (filler supply means)
27 CCD camera unit (imaging means)
W Work LB Laser beam YP Welding point

Claims (3)

A laser welding composite head that conducts welding by guiding a laser beam oscillated by a laser oscillator to a condensing system provided in a head body via an optical fiber, and condensing the laser beam at a welding point of a workpiece, An optical fiber for continuous laser (3) for transmitting a continuous laser oscillated by a laser oscillator and an optical fiber for pulse laser (5) for transmitting a pulse laser are connected to the head body (2). A continuous laser focusing system (9) connected to the continuous laser optical fiber (3) and a pulse laser focusing system (11) connected to the pulse laser optical fiber (5); Are separately provided in the head body (2), and the spot diameter and spot position of the continuous laser condensing system (19) and the pulse laser condensing system (11) can be arbitrarily set. Composite head laser welding, characterized in that are configured. The composite head for laser welding according to claim 1, further comprising a filler supply nozzle (15) for supplying a filler (13) for welding to the welding point (YP) at the center of the head body (2). The imaging means (27) for imaging the welding point (YP) on the workpiece (W), the continuous laser condensing system (9), and the pulse laser condensing system (11) include the filler supply nozzle. (15) A laser welding composite head characterized by being arranged at equal intervals around each of (15) . The composite head for laser welding according to claim 1, further comprising a filler supply nozzle (15) for supplying a filler (13) for welding to the welding point (YP) at the center of the head body (2). And an imaging means (27) for imaging the welding point (YP) on the workpiece (W), and the plurality of continuous laser condensing systems (19) are symmetrical about the center of the head body (2). The imaging means (27) and the pulse laser focusing system (11) are provided at symmetrical positions, and the plurality of continuous laser focusing systems (19) and the pulse laser focusing system are arranged at positions. The composite head for laser welding , wherein the optical system (11) and the imaging means (27) are arranged at equal intervals around the filler supply nozzle (15) .

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