JPH055594B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a laser beam welding device, and more particularly to a laser beam welding device for laser beam welding a leading strip and a trailing strip.

[Conventional technology]

FIG. 5 and FIG. 6 are, for example, JP-A-59-
223190 is an external view showing the conventional laser beam welding device shown in the publication, and FIG. 8 and FIG. 9 are operation explanatory diagrams of the laser beam welding device showing the operating states of FIGS. 5 and 6. .

In the figure, reference numeral 1 indicates a common base, 2 and 3 indicate front and rear clamp devices provided on the common base 1 at predetermined intervals, and 4
5 is a shear device that can move forward and backward from the left and right between the front clamp device 2 and the rear clamp device 3, and 5 is a shear device that can move forward and backward between the front clamp device 2 and the rear clamp device 3 from the left and right, similar to the shear device 4. A possible back bar device, 6 is an upper bed attached to the upper part of the rear clamp device 3, 7 and 8 are machined on the upper bed 6 in the left-right direction, that is, in the direction of both strip ends and in the front-back direction, and in the vertical direction between both strip ends. A welding carriage device for moving the head 9, 10 a transmission tube for transmitting a laser beam generated by a laser oscillator 11, 12 a leading strip (not shown), 13 a trailing strip, and arrows A indicate leading and trailing strips. Indicates the running direction of the strip.

FIG. 7 is a schematic diagram showing the optical system of the conventional laser beam welding device, in which reference numeral 14 is a mirror for changing the optical path of the laser beam;
1 is a condensing optical device mounted inside the processing head 9, such as a condensing lens or a condensing mirror, and 16 indicates a laser beam.

Next, the operation of this conventional device will be explained.

In a steel process line, when a strip is subjected to continuous treatments such as pickling, plating, and heat treatment, the strip runs in the direction shown by arrow A in FIG.

Then, as the strip is fed and reaches the end,
As shown in FIG. 8, this leading strip 12
It is guided into the blade width 4a of the shear device 4 and stopped.

In this state, the leading end of the trailing strip 13 is fed into the blade width 4a of the shear device 4 and stopped.

Then, as shown in FIGS. 5 and 8, the back bar device 5 is retracted and the shear device 4 is advanced to be located between the front clamp device 2 and the rear clamp device 3.

Then, both clamping devices 2 and 3 are used to clamp the strip 1.
After holding 2 and 13, the upper shear blade of shear device 4 is lowered to cut the opposite ends of both strips 12, 13 with the precision required for welding.

Subsequently, as shown in FIGS. 6 and 9, the shear device 4 is retracted, the back bar device 5 is advanced and located between the front clamp device 2 and the rear clamp device 3, and then the front clamp device 2 to the rear clamp device 3 side by the blade width 4a of the shear device A, and the cut surface of the leading strip 12 and the cut surface of the trailing strip 13 are butted against each other.

Then both strips 12,1 are butted together.
The welding caliper 8 is moved back and forth, that is, in a direction perpendicular to the end faces of both the strips 12 and 13, so that the processing head 9 is placed on the joint of the strips 12 and 13.

When preparations for welding are completed in this way, the direction of the laser beam 16 generated by the laser oscillator 11 is changed by the mirror 14 through the transmission tube 10, as shown in FIG. Welding is started by focusing the light onto the joints of both strips, and the welding carriage device 7 is moved in the left-right direction, that is, in the direction of the end faces of both strips, so that both strips 12 and 13 are successively welded.

[Problem that the invention seeks to solve]

The conventional laser beam welding device is constructed and operates as described above, so that both strips 1
2, 13 Problems such as the device that moves the processing head 9 in a direction perpendicular to the end face become large compared to the required stroke, and the power loss due to the mirror etc. of the laser beam generated by the laser oscillator becomes large. The dot was hot.

This invention was made in order to solve the above-mentioned problems, and it is possible to downsize the device that drives the strips in a direction perpendicular to the end faces of both strips, and to create a laser beam welding device that can reduce the number of mirrors. The purpose is to obtain.

[Means for solving problems]

A laser beam welding apparatus according to the present invention is provided with a condensing lens moving device in a processing head for moving a light traveling lens in a direction perpendicular to the end faces of both strips.

[Effect]

Since the laser beam welding apparatus according to the present invention is provided with a condensing lens moving device in the processing head that moves the condensing lens in a direction perpendicular to the end faces of both strips, alignment of the welding line and the laser beam is as follows. The welding carriage 8 is not required because this condensing lens moving device is used. Also, one mirror is not required.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment thereof.

FIG. 1 is an external perspective view showing a laser beam welding device according to the present invention, FIG. 2 is an explanatory diagram showing an outline of the optical path in FIG. 1, FIG. 3 is a left side view of FIG.
The figure is a detailed half-sectional view of the processing head. However, the shear device 4 is not shown, and the carriage device 8 is naturally not arranged.

In the figure, the parts indicated by numerals 1 to 7 and 10 to 16 are the same as those shown by the same numerals in the conventional device.

Next, reference numeral 17 is a condenser lens holder that holds a condenser lens, and 18 is a condenser lens holder that prevents the shielding gas inside the transmission tube 10 from leaking to the outside through the gap between the transmission tube 10 and the condenser lens holder 17. O-ring 19 connects the condenser lens 15 to lens holder 1
7 is a cap screw for fixing via an O-ring 20, and 21 is a cap nut 22 to attach the condenser lens holder 1.
7 is a processing nozzle fixed to it; 23 is a motor for moving the condensing lens holder 17 via a ball screw 24 and a ball screw receiver 24a fixed to the condensing lens holder 17; 25 is a motor for moving the condensing lens holder 17; The fixed rail 26 is a slide unit attached to the condenser lens holder 17 in order to slide the condenser lens holder 17 along the rail 25.

The above-mentioned parts constitute a processing head 27, and the motor 23, the ball screw 24, the rail 25, the slide unit 26, and the ball screw receiver 24a constitute a condensing lens moving device 28.

Since this embodiment is constructed as described above, in order to move the processing head 27 in the direction of arrow B in FIG. The condensing lens holder 1 is driven to rotate the ball screw 24, and the slide unit 26 is attached along the rail 25 attached to the transmission tube 10.
7 in the direction of arrow B, that is, both strips 12 and 13
move in a direction perpendicular to the end face of the The welding line 29 is detected by a separately installed sensor.
The condensing lens holder 17 is moved by the motor 23 so that the center of the condensing lens 15 is positioned above the junction of both strips 12 and 13. As a result, the laser beam 16 is focused on the center of the condenser lens 15 as shown in FIGS. can be done.

Furthermore, as shown in FIGS. 1 and 2, since it is not necessary to move the laser beam 16 itself in a direction perpendicular to the end faces of both strips, the number of mirrors 14 can be reduced by one.

〔Effect of the invention〕

As described above, according to the present invention, since the processing head is provided with a condensing lens moving device that moves the condensing lens in a direction perpendicular to both strip end faces, the welding carriage device 8 is not necessary. As a result, the welding carriage device 8 can be removed, and as a result, the laser beam welding device can be made smaller and cheaper, and the number of mirrors can also be reduced, so the laser beam power loss can be reduced. It has the effect that a beam welding device can obtain.

[Brief explanation of the drawing]

1 is an external perspective view showing a laser beam welding device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the optical path in FIG. 1, FIG. 3 is a left side view of FIG. 2, and FIG.
The figure is a detailed half-sectional view of the machining head in Figure 1, and Figure 5.
FIG. 6 is an external perspective view showing the state of the conventional laser beam welding device during cutting, FIG. 6 is an external perspective view showing the welding state of FIG. 5, and FIG. 7 is an explanatory diagram of the optical path of FIG. 5. 8 is a schematic diagram of FIG. 5, and FIG. 9 is a schematic diagram of FIG. 6. In the figure, 2... Clamp device (front clamp device), 3... Clamp device (rear clamp device), 4... Shear device, 5... Back bar device,
7... Welding carriage device, 12... Leading strip, 13... Trailing strip, 14... Mirror, 15... Condensing lens, 16... Laser beam, 27... Processing head, 28... Condensing lens Mobile device. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A pair of clamp devices arranged with a gap between each other so as to face and fix the ends of the leading and trailing strips separately; a shear device which is movable in the direction perpendicular to the strip and simultaneously cuts the opposite ends of both strips; a back bar device which is arranged to be movable at right angles and supports each of the opposite ends of the two strips; a processing head which has a focusing optical device which focuses the laser beam; In a laser beam welding apparatus comprising a welding carriage device that moves the welding carriage along the opposing end surfaces, the moving device that moves the focusing optical device of the laser beam in a direction perpendicular to the end surfaces of both strips is processed as described above. A laser beam welding device characterized by being provided within a head.