JPS6352787A - Laser beam welding equipment - Google Patents

Abstract

PURPOSE:To miniaturize the following moving device and to reduce the number of mirrors by providing on a work head the moving device to move a condensing optical device in right angles direction for the end face of both strips, in the device to weld the preceding and succeeding strips. CONSTITUTION:A condensing optical device, e.g., the moving device 28 of a condensing lens 15 is provided on a work head 27. The preceding and succeeding strips 12, 13 are opposed at their end parts which are held by clamp devices 3, 2 and the end parts of both strips are cut by the shear device 4 movable in a right angles direction B with the moving direction of both strips between the devices, 2, 3. The device 4 and back bar device 5 retreat and advance respectively in B direction, in succession, the cut faces of both strips are abutted by moving the device 2 to the device 3 side and a weld line 29 is formed. A lens 15 is then moved in B direction dy a moving device 28. Since the laser beam 16 whose light path is changed by a mirror 14 is thus condensed at the center of a lens 15 the laser beam 16 can be condensed on the weld line 29.

Description

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

[Conventional technology]

FIG. S and FIG. -2231
It is an external view showing the conventional laser beam welding device shown in the QQ publication, and FIG. 1 and FIG. 9 are operation explanatory diagrams of the laser beam welding device showing the operating states of FIG. .

In the figure, symbol (1) is the common base, (, 2) and (3) are the common base (front and rear clamping devices provided at a predetermined distance from front to back on the front and rear clamping devices, (da)
is a shear device that can move forward and backward from the left and right between the front clamp device (k) and the rear clamp device M (3); zl and the rear lamp device fjl, which can move forward and backward from the left and right directions, (61 is the rear clamp device (3)
1.IJ
A welding carriage device that moves the processing head (9) vertically between the end faces of the tabs, (10) is a laser oscillator (//)
A transmission tube that transmits the laser beam generated by (/
2'J is a leading strip (not shown), (/3) is a trailing strip, and arrow A indicates the feeding direction of the leading and trailing strips.

Moreover, FIG. 7 is a schematic diagram showing the optical system of the conventional laser beam welding apparatus, and the symbol (/) indicates a mirror for changing the optical path of the laser beam.

(/!r) is an i-light lens installed inside the processing head (91), and (/b'') indicates a laser beam.

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

In a steel processing line, if the strip is subjected to continuous treatments such as pickling, plating, heat treatment, etc., the strip runs in the direction indicated by arrow A in FIG.

When the strip is fed and reaches the end, the preceding strip (/2) is guided into the blade width ('la) of the shearing device (ri) and stopped, as shown in the figure.

In this state, the trailing strip (/3).

Its tip is fed into the blade width (4'a') of the shearing device (ri) and stopped.

Then, as shown in Fig. S and Fig. 5, the bank bar mounting N (left) moves backward, and the shear device moves forward, and the front clamping device (2) and the rear clamping device @ (a) move forward. located between.

Next, after holding the strips (/co and (/3) with both clamping devices ar: (, 2), (, 71), the upper shearing blades of the shearing devices 1t, t) are lowered and held with the precision necessary for welding. Cut the opposite ends of the IJ knobs (/, 2), (/3).

Subsequently, as shown in FIGS. 6 and 9, the shear device (ri) retreats, and the pack bar mounting fw[, 3'l moves forward to close the front clamping device (21) and the rear lamp mounting (21).
71 and then the front clamping device fil(x
Move i by the blade width ('l a) of the Hescher device (Al) on the rear clamping device (3) side, and remove the leading strip (/
Match the cut surface of 2) with the cut surface of the trailing strip (/, ?').

Next, both strips are butted together (/ko) (/3)
Set the welding carriage device (Z) by moving it in the front-rear direction, that is, in the direction perpendicular to the end faces of both strips (/:l) (/3), so that the processing head (9) is on the joint of the strips (/:l) (/3). do.

Once the welding preparations are completed in this way, the transmission tube (10
), as shown in FIG.
/) The laser beam (/B) generated by the mirror (
/ri) to change the direction and use the condenser lens (/S) to focus the light onto the joints of both strips to start welding, and move the welding carriage device (7) in the left-right direction, that is, in the direction of the end faces of both strips. By moving, both strips (/2) and (c?) are welded continuously.

[Problem that the invention seeks to solve]

A conventional laser beam welding device is configured as described above.
Since both strips (/2) (/
3) The device that moves the processing head (9) in a direction perpendicular to the end face becomes large in proportion to its required stroke, and the power loss due to the casing, the mirror of the v-the beam generated by the laser oscillator, etc. becomes large. Problems such as))
Ivy.

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

[Means for solving problems]

In the laser beam welding apparatus according to the present invention, a processing head is provided with a condensing lens moving device that moves a light traveling lens in a direction perpendicular to the end surfaces of both strips.

[For production]

In the laser beam welding device according to the present invention, the processing head is provided with a condensing lens moving device that moves the condensing lens in a direction perpendicular to the end faces of both strips, so alignment of this welding line and the V-the beam is , by this condensing lens moving device, the welding carriage III becomes unnecessary. Also, seven mirrors are no longer required.

〔Example〕

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

FIG. 1 is an external steel 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. 7,
3 is a left side view of FIG. 2, and the second figure is a detailed half-sectional view of the processing head. However, the description of the shear device (lIl) is omitted, and the carriage device (g) is naturally not installed.

In the figure, the symbols (C~(71) and (10)~C/6
) are the same as those shown with the same reference numerals in the conventional device.

Next, the code (/ri) is the condenser lens holder that holds the condenser lens, and (ig) is the inside of the transmission tube (/θ) due to the gap between the transmission tube (10) and the condenser lens holder C/7). O-ring to prevent shielding gas from leaking to the outside,
(/q) attaches the condenser lens (/S) to the lens holder (/7
) through the O-ring (20), (2/') is the processing nozzle fixed to the i-light lens holder (/) with a cap nut (2s), (Y3) is, A motor (2S) for moving the condensing lens holder (/7) via the ball screw (2 da) and the ball screw receiver (2Qa) fixed to the condensing lens holder (/7).
is a rail fixed to the transmission tube (10), and (roller) is the rail (along the rail, the condenser lens holder (/7)
This is a slide unit attached to the condenser lens holder (/7) for sliding.

The processing head (27) is composed of the above parts, and the light is focused by the motor (23), ball screw (2g), rail (2g), slide unit (:lb), and ball screw receiver (211a). Lens moving device (cog)
) is configured.

Since this embodiment is configured as described above, the processing head (core) is moved in the direction of arrow B in Fig. 1 in order to align the laser beam (/6) with the welding line (S9). To do this, first drive the motor (λ3) to rotate the bolt screw (koku), and the slide unit (roller) can be moved along the rail (2S) that has been moved into the transmission tube (10). The condensing lens holder (/7) is moved in the direction of arrow B, that is, in the direction perpendicular to the end faces of both strips (/2) (/3). Then, a condensing lens (/S) is placed on the joint of both strips (/2) (7, 7), which is the welding line (tq), by a separately attached center.
Move the condenser lens holder (/7) using the motor (3) so that it is centered. As a result, the laser beam (/6) is focused on the center of the condenser lens (/S) as shown in Figures 2 and 3, so that both strips (/:2) (/3) Laser beam (/
6) can be focused.

In addition, as shown in Figures 1 and 2, since there is no need to move the laser beam (/6) itself in a direction perpendicular to the end faces of both strips, the number of mirrors can be reduced by seven. can.

〔Effect of the invention〕

As described above, according to the present invention, the condenser lens can be
Since the processing head is equipped with a condensing lens moving device that operates in a direction perpendicular to the IJ knob end face, there is no need for a welding carriage device (g), and therefore, the welding carriage device (g) can be deleted. As a result, the laser beam welding device can be made smaller and cheaper, and since the number of mirrors can be reduced, the laser beam welding device can reduce the power loss of the laser beam. ing.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing a laser beam welding device according to an embodiment of the present invention, FIG. 1 is an explanatory diagram of the optical path in FIG. 1,
3 is a left side view of FIG. 2, FIG. 9 is a detailed half-sectional view of the processing head of FIG. 7, and FIG. S is an external perspective view showing the state of the conventional laser beam welding device during cutting. Figure 6 is an external perspective view showing the welding state in Figure 3, Figure 7 is an explanatory diagram of the optical path in Figure 3, Figure 3 is a schematic diagram of Figure 3, and Figure 9 is the same as in Figure 6. It is a schematic diagram. In the figure, (21...clamp device (front clamp device), f, ?l・clamp device (rear clamp device M),
), (/ill... shear equipment, Is)... Backpur Electric Manufacturing, (71・Fist welding key ridge equipment W, (/, 2
)・Leading strip, (/a) @−Leading strip,
(han...mirror, (7,3')...condensing lens, (/
6) φ・Laser beam, (sq)...processing head, (2
g) - Fist condenser lens moving device. In each figure, the same reference numerals indicate the same or corresponding parts. D, continuation amendment 1 (1゛

Claims (1)

[Claims] A pair of clamping devices are arranged with a gap between each other so as to face and separately fix the ends of the leading and trailing strips, and a pair of clamping devices is provided between the pair of clamping devices in the direction of movement of both strips. a shear device which is arranged to be movable in a direction perpendicular to the direction of movement of both strips and simultaneously cuts both opposite ends of both strips; a processing head having a condensing lens for condensing a laser beam; and a welding carriage device for moving the laser beam along the end surfaces of the strips, a moving device for moving the condensing lens of the laser beam in a direction perpendicular to the end surfaces of both strips is disposed within the processing head. A laser beam welding device characterized by: