JPH08132261A - Laser welding equipment - Google Patents

Abstract

PURPOSE: To stabilize the welding quality by assembling a pressing mechanism in a laser welding head, press-correcting the lapping part of an object to be welded and to make the equipment compact. CONSTITUTION: A holder 2 is attached on the top end of a robot, an object to be welded is press-clamped With the holder 2 and machining means, 4, 8, 3 fixed on the holder 2, and laser welding is executed with a laser welding head 7 attached on a pressing means through an attaching unit 5. Because the pressing means to press-clamp the object to be welded is installed near the laser welding head 7, the equipment can be made compact and the welding quality can be stabilized.

Description

Detailed Description of the Invention

[0101]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser welding apparatus mounted on a robot for laser welding.

[0092]

2. Description of the Related Art The method of welding the overlapping portion by spot welding which is widely used at present is that the overlapping portion is pressure-welded between two electrodes, so that the electrode gradually wears out when the number of welding increases, It often had to be ground or replaced. When trying to replace spot welding with laser welding, the laser welding device had to accurately position and hold the workpiece, and the positioning and holding device became large, making the entire device very large. Was becoming. Further, Japanese Patent Laid-Open No. 63-63594 discloses an example of an apparatus in which a gas laser apparatus for performing metal processing such as welding and a robot are connected, but it does not disclose positioning and holding of a workpiece.

[0093]

When metalworking such as welding is performed, if the workpiece is not positioned and held accurately and surely, the precision of the finished product is insufficient and it cannot be used. Therefore, the positioning and holding device had become rigid and strong. When laser welding is used to weld the laminated plate structure, a large restriction jig is required because the gap between the laminated portions is generally 1/5 (0.1 mm) or less of the plate thickness.

[004]

The present invention provides a robot control unit for operating a robot, a laser control unit for controlling a laser oscillator, and a holder for holding a workpiece on an arm of the robot. Further, pressurizing means (4, 4) for sandwiching the workpiece and applying a predetermined pressure.
8, 3) is provided integrally with the holder, and the laser welding head (7) is provided in the pressurizing means by the laser control unit via the mounting units (5, 6).

[0095]

Since laser welding is non-contact processing, the welding quality depends on the positioning and holding state of the workpiece. By keeping the distance between the laser processing head and the work piece accurate,
Welding is of constant quality.

[0086]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An explanation will be given with reference to FIGS. FIG. 1 is a side view of a main part of a laser welding apparatus for welding a laminated plate structure according to an embodiment of the present invention, in which a workpiece is placed in a holder 2 attached to an arm tip 1A of a robot 1. The pusher 3 that clamps in cooperation with the clamping unit 2A of 2
Is connected via a shaft 8 to a pressurizing mechanism 4 that pressurizes and releases the pusher 3. The pressurizing mechanism 4 performs a pressurizing operation with a fluid such as air pressure, and operates by a signal from the robot control panel 10. The laser processing head 7 is attached to the pusher 3 facing the holder 2 via attachment units 5 and 6.

When the proximity switch or the like confirms that the workpiece is set on the regulation jig 20 for regulating the position of the workpiece, the robot control panel 10 receives a signal and operates the robot 1 to stack the workpieces. Weld the plate structure. The arm tip portion 1A of the robot 1 is moved to a preprogrammed welding portion, and is held by the pusher 3 connected to the holder 2 and the pressing mechanism 4 while pressing and correcting the periphery to be welded. When it is detected that a predetermined pressing force of the pressurizing mechanism 4 is generated, a signal is output from the robot control panel 10 to the laser control unit 11 that controls the laser oscillator 12, and laser welding is sequentially performed as programmed.

FIG. 2 shows another embodiment of the apparatus of the present invention, in which the mounting unit 6 for mounting the laser processing head 7 on the pusher 3 is predetermined by the drive mechanism 9 incorporated in the mounting unit 6. It can be controlled to move in a straight line or curved line.

[0109]

As described above, the laser welding apparatus of the present invention is provided with a mechanism for correcting the pressure of the overlapping portion or the abutting portion for laser welding near the laser processing head. Quality can be stabilized.

[Brief description of drawings]

FIG. 1 is a side view of a main part of the present invention.

FIG. 2 is a side view of a main part of another embodiment of the present invention.

FIG. 3 is a perspective view of the present invention.

FIG. 4 is an explanatory diagram of a system of the present invention.

[Explanation of symbols]

 1 Robot 2 Holder 3 Pusher 4 Pressurizing mechanism 5 Unit 6 Unit 7 Laser processing head

Claims (2)

[Claims] 1. A robot control unit for operating a robot, a laser control unit for controlling a laser oscillator, a holder for holding a workpiece on an arm of a robot, and further holding the workpiece. A pressurizing means (4, 8, 3) for applying a predetermined pressure is provided integrally with the holder, and a laser processing head (7) controlled by a laser control unit is attached to the pressurizing means by a mounting unit (5, 6). A laser welding device, characterized in that it is provided via. 2. The laser welding device according to claim 1, wherein the mounting unit (6) has a driving mechanism (9) for driving the laser processing head (7) linearly or curvedly.