JPS62240177A - Automatic welding equipment - Google Patents

Abstract

PURPOSE:To perform the welding with an optional pitch and to attach and detach an object to be welded with high efficiency by moving a welding gun freely in the horizontal direction by a combination of two carriages which are movable in the directions of an X axis and a Y axis. CONSTITUTION:The carriage 14 and the carriage 17 are provided freely slidably in the direction of the X axis on a rail 12 of automatic welding units 10 and in the direction of the Y axis on a rail 15 at right angles to this and driven by motors 20 and 21 respectively. Then, the welding gun 34 is fitted on the carriage 17 and the welding is performed via an actuator 40. The plural welding units 10 are arranged around a prescribed clamping device and after a body panel is clamped, the carriages 14 and 17 are moved via a prescribed control means and the welding is performed. Accordingly, the welding can be performed with the optional pitch from the small pitch up to the large pitch and the object to be welded is very easily attached and detached.

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to an automatic welding device that automatically welds vehicle body panels, etc., and particularly relates to an automatic welding device that automatically welds vehicle body panels, etc. The present invention relates to a welding device in which a plurality of automatic welding units that perform automatic welding are arranged around a workpiece.

b. Prior Art As welding devices for welding vehicle body panels of automobiles, various devices are used depending on the content or type of welding. For example, multi-welding machines are commonly used in the process of welding plates for car body panels. There are various types of multi welding machines, and they are named according to their shape, such as the so-called C-frame type, 2-post type, or 4-post type. Figure 5 shows a two-post type multi welding machine, in which 1 is a wedge electrode;
2 is an electrode holder. Then, the vehicle body panel 3 is set on the second side of the wedge electrode 1. The platen 4 on which the electrode holder 2 is disposed is configured to be movable up and down along two vertical guide posts 5, and after raising the platen 4, the welding gun 6 is operated to weld the car body panel 3. Spot welding at multiple locations is done simultaneously.

In addition, in FIG. 5, 7 is a hydraulic cylinder, and 8 is a link.

C1 Problems to be Solved by the Invention By the way, the following problems have been pointed out to the above-mentioned multi welding machine. That is, even when the mutual spacing between the (+) welding guns 6 is made narrowest, the cylinders 6 of the welding guns 6
It cannot be smaller than the diameter of a. For this reason, there is a certain limit to welding density, and a multi-welder may not be applicable depending on the welding location.

(ii) In the multi welding machine shown in Fig. 5, the car body panel 3
This is inconvenient because mounting and removal must be done from the side, and it is not suitable for continuous welding processes in a production line.

(iii) In order to eliminate such inconvenience, a cart (not shown) on which the wedge electrode 1 is arranged is prepared,
It has also been proposed to weld the car body panel 3 while it is placed on the trolley, but this would increase the equipment cost and require a large space for the trolley to move, so it cannot be applied to conventional production lines. Have difficulty.

(iv) Since the welding time and the number of dots of the welding gun 6 are uniformly determined by the specifications of the multi welding machine, it is completely impossible to increase or decrease the number of dots etc. as appropriate depending on the length of the cycle tie 1 on the production line. Therefore, there are disadvantages such as the degree of freedom in designing the entire manufacturing line is restricted due to the welding process, or loss time occurs on the manufacturing line.

The present invention has been devised to effectively solve the above-mentioned problems, and its purpose is to enable welding with any pinch from a small pinch to a large pitch, and to enable welding of objects to be welded. It is an object of the present invention to provide a welding device which can be removed very efficiently and at a low cost.

d. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides the following features: a first truck movable in the X-axis direction; a second truck movable in the Y-axis direction; a welding gun disposed on the second truck;
and a first control means for driving and controlling the second trolley,
A plurality of automatic welding units constituted by a second control means for controlling the operation of the welding gun mentioned above are disposed around the object to be welded, and a plurality of clamp devices for fixing the object to be welded are provided. This is what was installed.

e. Operation In the present invention configured as described above, arbitrary pinch welding can be performed with the welding gun by driving and controlling the first and second carts. Furthermore, since the welding gun can freely move forward and backward, the welding gun does not get in the way when mounting or removing the workpiece, and mounting and removal can be carried out efficiently.

f. Example An example of the present invention will be described below based on the drawings. Figures 1 to 3 show the side, top and rear sides of an automatic welding unit 10, respectively. As shown in the figures, a pair of parallel rails 12 are placed on a horizontal base plate 11. is arranged (in the X-axis direction). A first carriage 14 is slidably disposed on the pair of rails 12 via a slider 13. On top of this first truck 14, there is also a rail 1 that is perpendicular to the rail 12.
A second carriage 17 is disposed on this rail 12 via a slider 16 so as to be freely slidable.

The first and second trolleys 14.17 are powered by two motors 2
0.21 respectively. Specifically, a threaded rod 23 parallel to the rail 12 is screwed into an arm plate 22 protruding from the lower surface of the first truck 14, and one end of this threaded rod 23 connects the boot 1J24 and the belt 25. The drive shaft 26 of the motor 20 is connected to the drive shaft 26 of the motor 20 via the drive shaft 26 of the motor 20 . Similarly, for the second truck 17, the truck 1
A threaded rod 28 parallel to the rail 15 is screwed onto an arm plate 27 protruding from the lower surface of 7, and one end of this threaded rod 28 is connected to the drive shaft 31 of the motor 21 via a pulley 29 and a belt 30. has been done.

A welding gun 34 is attached to the top of the second truck 17. More specifically, as shown in FIG. 1, a support plate 35 is erected on top of the second truck 17, and the intermediate portions of a pair of arms 36 and 37 are attached to the upper end of this support plate 35 through plackets 38 and 39. It is rotatably supported in the direction.

An air actuator 4 is attached to one end of the upper arm 36.
0 is arranged, and the actuating rod 4 of this actuator 4o
1 is connected to one end of the lower arm 37 via a link plate 42. On the other hand, welding tips 43 are disposed at the other ends of the pair of arms 36.37 to face each other, and when the air actuator 40 is driven, the pair of arms 36.37.
The other end of the welding tip 37 is closed, and the vehicle body panel 3 as the object to be welded is welded with the welding tip 43. Note that the welding gun is omitted in FIGS. 2 and 3.

The motors 20 and 21 mentioned above are controlled by a first control means (not shown), and the air actuator 40 is controlled by a second control means (not shown). These first and second tlilJ control means can be controlled by computer, for example.

The automatic welding unit 10 is configured as described above, and the welding of the vehicle body panel 3 by this unit is specifically performed in the fourth step.
As shown in the figure, two or more automatic welding units 1o are arranged around the vehicle body panel 3. In FIG. 4, reference numeral 46 indicates a plurality of clamp devices, and a predetermined clamp device 46 is used as appropriate depending on the type and size of the vehicle body panel.

Although the clamp arm 47 of the clamp device 46 is shown in a closed state in FIG. 4, it can be opened and closed by rotating vertically (in a direction perpendicular to the plane of the paper in FIG. 4) about a fulcrum pin 49 by a cylinder 48. The vehicle body panel 3 is set as shown in the figure with the clamp arm 47 open, and then the clamp arm 47 is closed and fixed.

Thereafter, the automatic welding unit 10 starts to operate, and while the welding gun 34 moves upward, predetermined welding positions on the vehicle body panel 3 are automatically welded one after another upward.

At this time, any welding pitch of the welding gun 34 can be selected by controlling the drive of the first and second carts 14, 17. Furthermore, since the welding gun 34 welds one location at a time, it is possible to control welding conditions such as current to best suit the conditions of each individual welding location, compared to the case of multiple welding.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. For example, in the above embodiment, the first and second carts 14.1
7 is driven by the drawer rod 23.2B, pulley 24.29 and belt 30, but it may also be driven by a combination of gears such as a rank and pinion.

g. Effects of the Invention As shown in jL above, the present invention allows the welding gun to be moved freely in the horizontal direction by the combination of the first and second carts, so welding can be performed at any pitch from a small pinch to a large pinch. It is possible to change or add a welding position corresponding to the type of workpiece to be welded very easily. In addition, since the welding gun can be moved forward and backward, the workpiece can be easily mounted or removed from a predetermined position without interfering with the welding gun. It can be realized at a lower cost than the large-scale equipment used for welding, and it can be easily applied to conventional production lines because no space is required to move the objects to be welded. Furthermore, compared to the case where the workpiece is placed on the platen L as in conventional two-post multi-welding machines, the workpiece can be welded at a relatively low position close to the floor with the present invention. Equipment maintenance is easy. In addition, since the welding gun welds one location at a time, compared to multi-welding, it is possible to control welding conditions such as constant current control to be optimal for the conditions of the welding location, such as the thickness of the steel plate. .

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a side view of the automatic welding unit, FIG. 2 is a plan view thereof, and FIG. 3 is a rear view of the automatic welding unit. FIG. 4 is a plan view of the welded state of the vehicle body panel. Further, FIG. 5 is a side view of a conventional two-post type multi-welding machine. 12, 15...Rail, 14...First trolley, 17
...Second trolley, 20,2] ...Motor,
23.28 ・・・Threaded rod, 24.29 ・・・
・Pulley, 25.30...Held, 34...
welding gun.

Claims (1)

[Claims] a first truck movable in the X-axis direction; a second truck disposed on the first truck and movable in the Y-axis direction intersecting the X-axis direction; and a second truck disposed on the second truck. An automatic welding unit constituted by a welding gun, a first control means for driving and controlling the first and second carts, and a second control means for controlling the operation of the welding gun is connected to the workpiece. An automatic welding device characterized in that a plurality of units are disposed around the welding device, and a plurality of clamp devices are disposed for fixing the object to be welded.