JPH0698504B2 - Automatic welding electrode shaping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a welding electrode for efficiently performing dressing in a robot welding line for transferring an object to be welded by a trolley by using a trolley for exclusive use of dressing. The present invention relates to the automatic shaping device.

(Prior Art) In the hitting process of spot welding using a conventional robot, when the electrode is worn and deformed, it is manually shaped, or the electrode is removed and collected in one place, and intensively ground by a drilling machine, etc. Attaching a shaped electrode to a robot welding gun was used. By the way, recently, an electrode shaping machine (dedicated dressing machine) 1 as shown in FIG.
Has been developed and is being considered for use in robot welding lines. This is an unpublished application filed in Japanese Utility Model Application No. 60-102379, in which a pair of electrodes 3 at the tip of a welding gun 2 held by a welding robot (not shown) are held on a gantry 7. A clamp arm (clamping means) 5, a shaping grinding tool 4 rotated around a vertical axis by a motor (air motor) 6, and a cylinder (moving means) 8 for moving the grinding tool 4 in the vertical direction are arranged. There is. This electrode shaper 1
In the above, after the electrode 3 of the welding gun 2 which is thrown in by the movement of the robot is clamped by the clamp claw 5, the grinding tool 4 is moved upward or downward by the cylinder 8 while the grinding tool 4 is rotated by the motor 6. If so, grinding tool 4
Thus, the pair of electrodes 3 is shaped. At this time, since the electrode 3 is held by the clamp arm 5, no shaping pressure is applied to the welding robot, and it becomes possible to use a small robot as a welding robot. Will be suitable.

(Problems to be solved by the invention) However, in the method of manually forming with a file and the method of removing the electrode and mounting after centralized shaping, a lot of man-hours are required, and a person needs to move in and out of the operating part of the robot. It is dangerous because it must be done. On the other hand, when a dedicated dressing machine is used, it is necessary to install one dressing machine for each robot, resulting in a large investment amount and a space for installing the dressing machine in each process. In addition, the layout may not allow the installation space for a dedicated dressing machine.

The present invention provides an apparatus that does not require an installation space for an electrode shaper and can easily shape an electrode without requiring manpower.

(Means for Solving Problems) In the present invention, in a robot welding line for transporting an object to be welded by a trolley, an electrode shaping machine is mounted on one or more of the trolleys instead of the object to be welded. The electrode shaping machine includes a clamp means for holding an electrode held by the robot, a grinding tool rotationally driven by a motor, and a moving means for moving the grinding tool forward and backward with respect to the electrode held by the clamp means. It is configured to be provided.

(Operation) With such a configuration, on the welding line, since the trolley on which the object to be welded is placed and the trolley on which the electrode shaping machine is mounted are mixed, the operation for electrode shaping is performed in advance. If the carriage is positioned at the welding position at an appropriate timing by teaching the welding robot to the welding robot, the electrode is moved to the electrode shaping machine by the operation of the welding robot, and the clamping means, the grinding tool, and the movement inside the electrode shaping machine are moved. The electrodes are automatically shaped by the operation of the means or the like.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show a portion where welding is performed on the assembling transfer line 10. Here, the carriage 11 on which the object to be welded (not shown) is placed is the carriage moving device 12. Move along line 10. An object to be welded, for example, an automobile body is usually placed on the carriage 11, and welding work is performed by the welding robot 13 installed beside the transfer line 10. However, one of several trolleys 11 does not have an automobile body mounted, and instead, an electrode shaping machine (automatic electrode shaping machine) 16 having the same structure as the dressing dedicated machine 1 shown in FIG.
It is connected to the electrode shaping cart 17 equipped with. This electrode shaping cart 17 shapes the electrode 15 mounted on the welding gun 14 of the welding robot 13.

Although the automobile body on the carriage 11 of the assembling transfer line 10 is welded by the welding gun 14 of the robot 13,
The electrode 15 at the tip of the welding gun 14 has to be shaped because it will be worn and deformed if several bodies are welded. Therefore, the trolley 11 has a number of automobile bodies mounted on it, and then the automatic electrode shaping machine 16 is installed, and the electrode shaping trolley 17 is mixed in the trolley 11. To reach. The welding robot 13 then does not perform the normal welding operation, but instead is programmed to move the electrode 15 into the automatic electrode shaping machine 16 for dressing, and the electrode shaping carriage 17 causes the welding robot to move. When the user comes to the place 13, a power source and an air source supply device (not shown) are automatically connected to the electrode shaping carriage 17.
Then, the control device 18 in the electrode shaping cart 17 starts to operate. Since the automatic electrode shaping machine 16 has the same structure as the dedicated dressing machine 1 in FIG. 4, the electrode is clamped by the clamp arm 5, the grinding tool 4 is rotated by the air motor 6, and the grinding tool 4 is moved back and forth by the cylinder 8. The same movement of movement is controlled by the control device 18 to shape the electrode 15. When the shaping of the electrode 15 is completed, the vehicle body is placed on the next carriage 11 and the welding work similar to the previous one is continued.

(Effects of the Invention) Since the present invention has the above-described configuration and operation, the electrode shaping machine on the carriage can be shared by a plurality of welding robots arranged on the welding line. 2 to 8 electrode shaping machines are required for 100 robots, and the equipment cost is greatly reduced. Moreover, not only is the space for installing the electrode shaper saved, but if the space of the electrode shaper is out of the operating range of the robot, any trouble will be completely eliminated. In addition, by circulating the electrode shaping cart at an appropriate frequency, the electrodes are shaped at an appropriate frequency in each process, which stabilizes the welding quality, which eliminates the need for step-up control of welding current. Is also big. Moreover, since the electrode shaping machine mounted on the trolley performs the shaping while holding the electrodes by the clamping means, the pressure at the shaping is not applied to the welding robot, and a small robot can be used as a robot. It is suitable for welding lines that require.

[Brief description of drawings]

FIG. 1 is a front view of a welding line of an embodiment of the present invention, FIG. 2 is a side view of the electrode shaping carriage, and FIG. 3 is a plan view thereof.
FIG. 4 is a side view when the electrode is shaped by the electrode shaping machine used in the present invention. 10 …… Conveying line for assembly 11 …… Truck 12 …… Truck moving device 13 …… Welding robot 14 …… Welding gun 15 …… Welding electrode 16 …… Electrode shaping machine 17 …… Truck for electrode shaping

Claims (1)

[Claims] 1. In a robot welding line for transferring an object to be welded by a trolley, an electrode shaping machine is mounted on one or more of the trolleys instead of the object to be welded, and the electrode shaping machine is provided to the robot. A clamp means for holding the electrode, a grinding tool rotationally driven by a motor, and a moving means for moving the grinding tool forward and backward with respect to the electrode held by the clamp means. Automatic shaping device for welding electrodes.