JPH07204862A - Spot welding equipment - Google Patents

Abstract

PURPOSE:To reduce the work of a worker and to improve the working efficiency by executing the manual operation of only the first product, and executing the automatic operation of the rest of the products when the spot welding is automatically executed, especially when a plurality of spot weldings of the same products are executed. CONSTITUTION:A work table 5 is provided on an erected bed 3, and a supporting frame 7 extending in the vertical direction is provided, and an arm member 17 which is turnable around a rotary shaft 15 provided on this supporting frame 7 is provided, and a gun supporting cylinder 23 which is movable in the longitudinal direction of the arm member 17 is provided on this arm member 17. In a spot welding equipment 1, a welding gun 25 is provided to the lower part of this gun supporting cylinder 23, an electrode 27 is provided at the tip of this welding gun 25, and a grip 31 provided with a starting switch 29 on the rear part is provided. A driving means 33 for turning the arm member 17, a turning position detecting means 39, a driving means 41 to move the welding gun, and a welding gun position detecting means 43 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spot welding device having a learning function.

[0002]

2. Description of the Related Art A conventional spot welding apparatus 1 has a box-shaped bed 3 standing upright as shown in FIG. 4, for example.
A work table 5 on which the work W is placed and fixed is provided on the bed 3. Bed 3 again
A support frame 7 extending vertically is provided on the upper right side. A guide rail 9 extending in the vertical direction is laid on the left side of the upper portion of the support frame 7, and a moving member 11 movable in the vertical direction is provided on the guide rail 9.

A swing shaft 15 is rotatably provided on the moving member 11 via a support block 13. A base of an arm member 17 extending in the horizontal direction is attached to the swivel shaft 15. A guide rail 19 extending in the horizontal direction is provided on the lower surface of the arm member 17, and a gas support cylinder that is movable in the longitudinal direction of the arm member 17 via a plurality of guide members 21 on the guide rail 19. 23 is attached by hanging.

A welding gun 2 is provided below the gas support cylinder 23.
5, a welding electrode 25 is provided with a detachable electrode 27 at the tip thereof, and a grip 31 having an electromotive switch 29 is provided at the rear portion thereof.

With the above structure, the operator manually grips the grip 3
1 is grasped and the arm member 17 is manually turned around the turning shaft 15 as a fulcrum. Further, the welding gun 25 is moved in the longitudinal direction of the arm member 17 to position the electrode 27 at the spot position of the work W placed on the work table 5. Next, the electromotive switch 2 provided on the grip 31
The spot welding process is performed on the work W by operating 9.

[0006]

By the way, in the above-mentioned conventional spot welding apparatus 1, the arm member 17 is manually swiveled and the welding gun 25 is moved to the arm member 1.
Since the electrode 27 is positioned by moving it in the longitudinal direction of 7, the work load is high, and it is difficult to work for a long time because the worker's physical strength is consumed. Furthermore, many spot welding processes have reduced work efficiency by repeating simple processes.

An object of the present invention is to carry out spot welding automatically so that, particularly when a plurality of spot weldings of the same product are carried out, only the first product is manually operated,
Another object of the present invention is to provide a spot welding apparatus which automatically performs the rest and reduces the work of a worker and improves work efficiency.

[0008]

In order to achieve the above object, the spot welding apparatus of the present invention comprises a work table provided on an upright bed and a support frame extending vertically on the bed. An arm member that can be horizontally swung around a swivel axis provided on the support frame is provided, a gun support cylinder that is movable in the longitudinal direction of the arm member is provided on this arm member, and a welding gun is provided below the gun support cylinder. A spot welding apparatus having an electrode at the tip of the welding gun and a grip provided with a start switch at the rear of the welding gun, the swiveling drive means for swiveling the arm member, and the swiveling position of the arm member. Position detecting means for detecting the movement of the welding gun, moving driving means for moving the welding gun in the longitudinal direction of the arm member, and detecting the moving position of the welding gun. A welding gun position detection means for and is characterized in that it comprises an.

In the spot welding apparatus, each of the turning drive means, the turning position detecting means, the moving driving means, the welding gun position detecting means and the start switch is connected to the control device, and the control device has a learning function. It is desirable that the control device be provided with a means and that the control device be provided so that the teaching mode and the automatic operation mode can be selected.

[0010]

By using the spot welding apparatus as described above, spot welding can be automatically performed. Especially when performing multiple spot welding processes on the same product,
By manually operating only the first product and automatically performing the rest, it is possible to reduce the work of the worker and improve the work efficiency.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a side view of an embodiment of the spot welding apparatus of the present invention. In FIG. 1, the same parts as those in the description of FIG. 4 which have already been described as the prior art are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, a drive rotary shaft 35, which is a part of the rotary drive means 33, is integrated with the rotary shaft 15, and a rotary drive motor 37 is connected to the drive rotary shaft 35. The turning drive motor 37 is provided with turning position detecting means 39 such as an encoder.

At the left end of the arm member 17 in FIG. 1, a moving drive motor 4 which is a part of a moving drive means 41.
3 is attached to the moving drive motor 43, and the gun support cylinder 23 is connected to the moving drive motor 43 via a transmission member such as a ball screw or a nut member. Further, the arm member 17 is provided with welding gun position detecting means 45 such as a proximity switch or a photoelectric switch for detecting the position of the welding gun 25 in the left-right direction in FIG.

With the above structure, when the turning drive motor 37 is driven, the turning shaft 15 is rotated via the drive rotation shaft 35, so that the arm member 17 is automatically turned around the turning shaft 15 as a fulcrum. . The turning position of the arm member 17 caused by the rotation of the turning shaft 15 is detected by the turning position detecting means 39.
Can be detected by.

When the moving drive motor 43 is driven,
Since the gun support cylinder 23 is guided by the guide rail 19 and is moved in the left-right direction in FIG. 1, the welding gun 23 is also moved in the same direction. The position of the welding gun 23 can be detected by the welding gun position detecting means 45.

As shown in FIG. 2, the turning drive motor 37 and turning position detecting means 39 are connected to the CPU 49 of the control device 47 for controlling the spot welding apparatus 1, and the moving drive is performed. The motor 43 and the welding gun position detecting means 45 are also connected. CPU49
A startup switch 29 is connected to the.

The CPU 49 is connected with a teaching mode button 51 for setting a teaching mode and an automatic operation mode button 53 for setting an automatic operation mode. Further, the CPU 49 has the turning position detecting means 39,
A turning position memory 55, a welding gun position memory 57 and a starting memory 59 for storing the detection data detected by the welding gun position detecting means 45 and the starting switch 29 are connected. Further, the CPU 49 causes the memories 55, 57, 5 to
The NC machining program generation unit 61 is connected based on the detection data stored in 9.

The operation of performing a plurality of spot welding processes for the same product with the above-described structure will be described with reference to the flowchart shown in FIG. 3. First, in step S1, the teaching mode button 51 is turned on to enter the teaching mode. Then, in step S2, when the operator holds the grip 31 and positions the electrode 27 of the welding gun 25 at the spot position ST (shown in FIG. 1) of the work W, X and Y coordinate values are displayed. When the start switch 29 provided on the grip 31 is operated in step S3 to perform spot welding, in step S4, a turning position signal of the arm member 17 is sent from the turning position detecting means 39 to the turning position memory 55 and stored therein. It

Further, the position signal of the welding gun 25 is sent from the welding gun position detecting means 45 to the welding gun position memory 57 and stored therein. Furthermore, the signal from the start switch 29 attached to the grip 31 is used as a start signal in the start memory 59
Sent to and stored.

When the spot welding process is continued while moving the spot position ST by the same operation, the welding point of the electrode 27 of the welding gun 25 and the start signal of the spot welding are sent to the memories 55, 57 and 59 one after another and stored. Be learned.

When it is judged in step S5 whether or not the teaching is finished and the teaching is finished, in step S6, the NC machining program generator 61 automatically generates the NC machining program. The automatic operation mode is selected by turning on the automatic operation mode button 53 in step S7.

In step S8, the turning drive motor 37 and the movement drive motor 43 are driven by the drive signal of the controller 47 in accordance with the execution of the NC machining program, and the welding gun 25 is automatically positioned. Further, a start signal of the welding gun 25 is transmitted from the control device 47 to perform spot welding processing. In this way, the electrodes 27 are successively positioned at the spot positions ST where the spot welding process has been performed manually, and the same work as the welding process during the manual operation is automatically executed.

Therefore, the spot welding process can be automatically performed. Particularly, when a plurality of spot welding processes for the same product are performed, only the first product is manually operated and the rest is automatically performed, which can reduce the work of the operator and improve the work efficiency.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

[0026]

As can be understood from the above description of the embodiment, according to the present invention, the spot welding process which is manually operated can be automatically performed. Particularly, when a plurality of spot welding processes for the same product are performed, only the first product is manually operated and the rest is automatically performed, which can reduce the work of the operator and improve the work efficiency.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a spot welding apparatus of the present invention.

FIG. 2 is a configuration block diagram of a control device for controlling the spot welding device.

FIG. 3 is a flowchart for explaining the operation of spot welding processing according to the present invention.

FIG. 4 is a side view showing a conventional spot welding apparatus.

[Explanation of symbols]

 1 Spot Welding Device 3 Bed 5 Work Table 7 Support Frame 15 Swivel Axis 17 Arm Member 23 Gun Support Cylinder 25 Welding Gun 27 Electrode 29 Electromotive Switch 31 Grip 33 Swiveling Drive Means 37 Swiveling Drive Motor 39 Swiveling Position Detection Means 41 For Moving Drive means 43 Movement drive motor 45 Welding gun position detecting means 47 Control device 49 CPU 51 Teaching mode button 53 Automatic operation mode button 55 Swiveling position memory 57 Welding gun position memory 59 Startup memory 61 NC machining program generator

Claims (3)

[Claims] 1. An arm member which is provided with a work table on an upright bed, a support frame extending in the up-down direction on the bed, and a swing shaft provided on the support frame, which is capable of swinging horizontally in a horizontal direction. This arm member is provided with a gun support cylinder that is movable in the longitudinal direction of the arm member, a welding gun is provided at the bottom of this gun support cylinder, an electrode is provided at the tip of this welding gun, and it is activated at the rear of the welding gun. In a spot welding apparatus provided with a grip equipped with a switch, a turning drive means for turning the arm member, a turning position detecting means for detecting a turning position of the arm member, and a welding gun are moved in a longitudinal direction of the arm member. Spot welding, characterized by comprising: a driving means for moving the welding gun; and a welding gun position detecting means for detecting the moving position of the welding gun. apparatus. 2. The turning drive means, the turning position detecting means, the moving driving means, the welding gun position detecting means and the starting switch are each connected to a control device, and the control device is provided with a learning function means. Spot welding equipment characterized by: 3. The spot welding apparatus according to claim 2, wherein the controller is provided with a selectable teaching mode or automatic operation mode.