JPS6033596B2 - Laser welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser welding device that can simultaneously weld two or more joints on a workpiece.

Conventionally, as this type of welding apparatus, there has been one shown in FIG.

In the figure, 1 is a laser oscillator, 2 is a laser beam generated by this laser oscillator 1, 3 is a semi-transparent mirror that reflects a part of the laser beam 2 and transmits the remaining laser beam 2; 4 is a plane mirror that totally reflects the laser beam 2, 5a is a processing head that irradiates the workpiece 7 with the laser beam 2 reflected by the semi-transmissive mirror 3, and 5b is a plane mirror that irradiates the workpiece 7 with the laser beam 2 reflected by the plane mirror 4. 7, a processing head that irradiates the laser beam 2; 6a, 6b are condensing lenses that condense the laser beam 2; 8a, 8b are joints for joining the workpiece 7;
9 is a welding jig that supports the workpiece 7;
The figure shows the processing table that moves the . Next, the operation of this conventional device will be explained.

When laser welding a workpiece 7 consisting of two joints 8a, 8b arranged in parallel, each joint 8a, 8b
If the bonding is performed at different times, distortion occurs and the quality deteriorates, causing a decrease in yield. Therefore, it is necessary to join the two joints 8a and 8b at the same time, and for this purpose, the device structure shown in FIG. 1 is required.
That is, the laser beam 2 generated from the laser oscillator 1 is
The traveling direction is changed by a semi-transparent mirror 3 and a plane mirror 4 installed according to the spacing between the joining joints 8a and 8b of the workpiece 7, and from the condensing lenses 6a and 6M installed inside the processing heads 5a and 5b. The condensed light is irradiated onto the joints 8a and 8b of the workpiece 7 set on the welding jig 9, and simultaneous welding of the joints 8a and 8b that are adjacent to each other is achieved by simultaneously moving the processing table 10. Ru. The conventional laser welding device for joining joints 8a and 8b arranged side by side is configured as described above, and the semi-transparent mirror 3 is expensive and has poor durability.
Moreover, when the joining joints 8a and 8b are close to each other, it is extremely difficult to reduce the joint spacing to about 10 mm or less due to the dimensional constraints of the processing heads 5a and 5b. was there.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional joint assembly, and uses a scanner that vibrates a laser beam to distribute the laser beam to each joint at a temporally effective frequency. Accordingly, it is an object of the present invention to provide a laser welding device that can easily perform simultaneous welding even on workpieces in which joints are adjacent to each other.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment of the present invention, in which the same or corresponding parts as in FIG. 1 are denoted by the same reference numerals. In FIG. 2, 11 is a plane mirror that changes the direction of the laser beam 2, 12 is a cylindrical mirror that focuses the laser beam 2, 13 is a reflecting mirror, and 14 is a scanner that vibrates the reflecting mirror 13 at high speed. Next, the operation of the embodiment shown in FIG. 2 will be explained. First, a laser beam 2 generated from a laser oscillator 1 has its traveling direction changed by a plane mirror 11.
The cylindrical mirror 12 concentrates the spot so that the spot diameter is smallest near the surface of the workpiece 7. Next, the cylindrical mirror 12
The laser beam 2 that has been focused and reflected is reflected by the reflecting mirror 13.
The workpiece is bent in the 7 direction by the scanner 1.
4 causes high-speed vibration between the joining joints 8a and 8b. In this way, the joints 8a and 8b can be simultaneously welded by the laser beam 2. FIG. 3 shows the movement of the laser beam 2 on the workpiece 7 and the vibration waveform of the reflecting mirror 13 caused by the scanner 14.

Further, FIG. 4 shows the movement of the laser beam 2 on the workpiece 7 and the vibration waveform of the reflecting mirror 13 caused by the scanner 14 when the laser oscillator 1 generates the laser beam 2 having a pulsed waveform.

That is, FIG. 3 shows a case where the laser beam 2 generated by the laser oscillator 1 has a continuous waveform, and the vibration locus of the laser beam 2 on the workpiece 7 has a continuous waveform as shown in FIG. 3a. state. Therefore, the laser beam 2 is also scanned between the joining joints 8a and 8b, but from the processing conditions such as the melting behavior of the workpiece 7 and the welding speed, the vibration frequency by the scanner 14 shown in FIG. By setting the frequency to 300 Hz or higher, the intermediate portions of the two joining joints 8a, 8b are not melted at all, and it is as if the respective joining joints 8a, 8
It looks like b was welded independently. Furthermore, FIG. 4 shows a case where the laser beam 2 generated by the laser oscillator 1 has a pulse waveform, and as shown in FIG. By synchronizing the 13 vibration frequencies, the fourth
As shown in Figure a, the vibration locus of the laser beam 2 on the workpiece 7 is independent of the frequency value,
It will only exist above. In addition, in the above-mentioned embodiment device, only the butt joint was explained.
Similar effects can be obtained when used in other joint structures such as lap joints. In addition, in the above-mentioned example apparatus, the case where the laser beam is distributed to two parallel joints was explained, but simultaneous welding of two or more joints can also be easily done by simply changing the vibration waveform of the laser beam. It can be applied to As described above, according to the present invention, a laser welding device for simultaneously welding multiple joints is provided with a scanner that vibrates one laser beam, thereby welding extremely close joints. This has the advantage that laser welding can be performed easily and the equipment is also inexpensive.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view showing a conventional laser welding device;
The figure is a cross-sectional side view showing a laser welding device according to an embodiment of the present invention, and FIGS. 3a and 3b are diagrams showing the locus of the laser beam on the workpiece by the embodiment shown in FIG. 2, and a scanner. Figures 4a and 4b are waveform diagrams showing the vibration of the reflecting mirror due to pulse waveform laser beam welding. FIG. 1...Laser oscillator, 2...Laser beam, 7...Workpiece, 8a, 8b...Joining joint, 13...Reflector, 14・・・・・・Scanner. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A laser welding device that performs laser welding of a plurality of parallel welding lines, comprising: a laser oscillator that generates a laser beam; a plane mirror that changes the traveling direction of the laser beam generated by the laser oscillator; A cylindrical mirror that focuses a laser beam whose traveling direction has been changed by a plane mirror near the workpiece, a reflector that irradiates the laser beam focused by the cylindrical mirror onto the workpiece, and a reflector that moves the reflector at high speed. A laser welding apparatus comprising a scanner that vibrates a laser beam reflected by the reflecting mirror at a frequency of 300 Hz or more and alternately irradiates the welding line at the plurality of locations with the laser beam. 2. The laser welding apparatus according to claim 1, wherein the laser oscillator generates a pulsed waveform laser beam. 3. The laser welding apparatus according to claim 2, wherein the frequency of the laser beam with a pulsed waveform generated by the laser oscillator is synchronized with the vibration frequency of the reflecting mirror vibrated by the scanner.