JPS5922940Y2 - arc spot welding machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an arc spot welding machine, which includes an arc spot welding torch, a skirt slightly longer than the nozzle end attached with one hech in between to hold the workpiece, and the torch attached to the skirt. It is characterized by consisting of a mechanism for rocking.

In arc spot welding, multi-point welding is usually performed, as shown in Figure 1. As shown in Figure 1, the welding machine applies the tip of nozzle 1 to workpiece 2 to weld, then moves sequentially and repeats welding. The tip of the nozzle 1, which is equipped with a shielding gas discharge hole, also serves as a presser to pressurize the workpiece 2 to ensure uniform quality of the welded joint.

In addition, the tensile shear strength of the joint at the weld is approximately determined by the size of the nugget I/diameter, but the maximum diameter of the nugget at the weld is actually determined by the plate thickness of work 2, so the joint In order to increase the tensile shear strength of a workpiece, it is necessary to narrow the welding point spacing (pitch) and increase the number of weld nuggets in the workpiece.

However, the conventional arc spot welding machine that also serves as a workpiece holder, as described above, does not perform the second
As shown in the figure, the tip of nozzle 1 is attached to the welded part.
3, the welding point pitch is inevitably limited by the outer diameter of the tip of nozzle 1, etc. If welding point pitch: P, nugget diameter: D, outer diameter of the tip of nozzle 1: d, then P > 3A. (
D+d) There are many situations in which it is not possible to achieve the desired welding point pitch due to the constraint of D+d).

Therefore, the arc spot welding machine of the present invention is fully equipped with the conventional arc spot welding function, completely eliminates the above restrictions, and enables continuous multi-point spot welding with consideration to actual workability. This is what I did.

The present invention will be explained below with reference to an embodiment of three-point continuous spot welding shown in FIGS. 3 to 5.

4 is an I-chi with a nozzle 5 at the tip, 6 is a tip, 7
1 is a bundle body in which grips 7b and 7C are formed on both sides of a central portion 7a, and an opening 7d is formed in the central portion through which the 1--chie 4 passes in the vertical direction.

Reference numerals 8 and 8 denote two skirts that hold down the workpiece 2 at their lower ends, one of which is attached to a grip 7b at the lower part of the center part 7a of the bundle body 7.
, 7C direction with bolts 9.

Reference numeral 10 denotes an I-chi receiver having pins 11.11 protruding from both sides, and pins 11. 1
The nozzle 5 of the torch 4 provided in the torch holder 10 is rotated with the scarr 1-8.8 with the pin 11.11 as the axis.
The bundle body 7 is supported so as to be swingable in the direction of the grips 7b and 7C between them.

In this case, the gap between the tip of the nozzle 5 and the workpiece 2 should be greater than the welding build-up height h - L, and the skirt 8 should be placed from the tip of the nozzle 5 to the extent that it does not come into contact with the nugget 3 of the existing welding point.
, 8 is lengthened.

Reference numerals 14 and 15 refer to collars 1 to 15 provided at the bottom of both sides of the central portion 7a of the bundle body 7, and their tips are inserted into the opening 7d of the central portion 7a.
The swinging angle of the nozzle 5 is regulated so that the tips of the nozzles 5 of the first and second channels 4 are tilted at an angle corresponding to a suitable welding point pitch.

16.17 are lever parts provided on both sides of the torch holder 10, 1
Reference numeral 8 denotes a spring stretched between the lever portion 16 and the grip 7b of the bundle body 7, whereby the nozzle 5 comes into contact with the stopper 14, and the tips of the two nozzles 5 are tilted to the left as shown in FIG.

Reference numeral 19 denotes an operation lever provided at the lower part of the grip 7C, which is connected to the lever part 17 via a link 20. When the lever 19 is grasped against the spring 21, the nozzle 5 moves between the link 20, the lever part 17, and the torch. It swings via the receiver 10.

22 is a switch provided on the grip 7b;
2 to energize the tip 6 to perform the welding operation, and to control the energization time, etc., a timer (not shown) can be used to appropriately set the time and select operations such as continuous operation of three-point welding are possible.

Next, to explain the operation of the welding machine, place the welding machine at the position where the workpiece 2 is to be welded, grip and hold the grips 7b and 7C, hold the workpiece 2 down with the skirt 8.8, and operate the switch 22. .

, the second person's number 5 is the spring 18 (this is more Sudonpa 1
4, the workpiece 2 is welded at point A as shown in FIG.

Next, while holding down the workpiece 2 with the skirts 8 and 8, tighten one operating lever of the grip 7C and apply 1 welding pitch P1 minute through the link 20, lever part 17.1, and the bridge holder 10. The torch 4 is swung at an angle θ to weld the next second point, that is, point B of warp 2.

In this case, it is convenient to mark the bundle body 7 with a scale indicating the neutral point position.

Then, by further tightening the operating lever 19, the I-ch 4 is swung by 1 welding pitch P2 until the nozzle 5 comes into contact with the stopper 15, and the workpiece 2 is tilted to an angle as shown in FIG. The three-point continuous welding process is completed by welding point C.

Welding can be performed sequentially by repeating this operation.

In the above welding machine, the torch was tilted manually, but in the embodiment shown in Figures 6 and 7, a pulse motor is used in the torch tilting and swinging mechanism to automate the continuous three-point welding operation. This is an example.

To explain its structure and operation, the output shaft 24 of the pulse motor 23 provided in the center 7a of the bundle body 7 is directly connected to the pin 11 of the 1-chi receiver 10, and the energization start switch 22' provided in the grip 7b is activated. The tip 6 is energized, the pulse motor 23 is rotated by the tilting start switch 22'' provided on the grip 7C, the 1-chip receiver 10 is rotated via the output shaft 24, the nozzles 5 are sequentially tilted, and the timer is activated. 3;:χ continuous welding operation is automatically performed by controlling the energization time and tilting angle θ, or by sequence control.

In this case, instead of the stoppers 14 and 15 in the embodiment described above, the first
Switches 25 and 26 can be used for limit 1 as a means for checking the spotting and welding positioning of welding point A and third welding point C, or a limit switch can also be installed to ensure the position of second welding point B. can.

Further, when performing sequence control, energization and tilting operations can be performed using only the switch 22'.

In this invention, as mentioned above, Scar 1~ is attached as a work holder, and the tip of the torch nozzle is always attached to the Nage I of the already connected part.
Since it is configured so that it can be welded in a floating state without touching the surface, it has an extremely effective function in that it is possible to appropriately narrow the welding point spacing and secure the necessary tensile shear strength. It is compact and has a mechanism that allows continuous multi-point welding, taking into account the workability of spot welding, which is usually multi-point welding, so it is extremely effective in terms of practicality, such as being effective in terms of work efficiency and having a wide range of uses. This is a new idea.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a conventional arc spora welding machine, and Fig. 2 is a partially cutaway front view of a conventional arc spora welding machine. Figures 3 to 5 show an embodiment of the arc spot welding machine of the present invention. Figure 3 is a partially cutaway front view, and Figure 4 is a partially cutaway side view of Figure 3. , 5th
6 and 7 show other embodiments of the arc spora 1 to welding machine of the present invention. FIG. 6 is a partially cutaway front view, and FIG. FIG. 7 is a partially cutaway side view of FIG. 6. 2 is a workpiece, 4 is a l-ch, 5 is a nozzle, 7 is a bundle body, 7a is a central part thereof, 7b, 7c are a grille, 8
is the skirt, 10 is the l-chi holder, 11 is the pin, 14, 1
5 is a stopper, 18 is a spring, 20 is an operating lever 23 is a pulse motor, and 24 is an output shaft.

Claims (1)

[Scope of utility model registration request] A skirt slightly longer than the nozzle end with a torch in between is used as a workpiece holder, the torch is swingably supported on the skirt, and continuous multi-point spot welding is performed by swinging the torch at appropriate welding point intervals. An arc spot welding machine that is characterized by the following: