JPS5841683A - Indirect spot welding device - Google Patents

Abstract

PURPOSE:To facilitate carrying in and out and setting work from above a material to be welded by placing an inner panel on a lower side and an outer panel on an upper side, and bringing conductive electrodes in press contact with the inner panel from below. CONSTITUTION:The work 45 combined with an outer panel 47 on an upper side and an inner panel 46 on a lower side is conveyed above posts 44, and is placed on conductive electrodes 54. An arm 59 of a clamp 56 is turned in the direction opposite from an arrow B direction, and a receiving plate 61 is brought into contact with the welding position 48 of the panel 47. When a lever 63 is turned in the direction opposite from an arrow A direction, a roller 65 presses the arm 59, and the work 45 is forced in against compression springs 55. When the roller 65 engages with a recess 64 and the clamp 56 comes into a clamping position, the work 45 is pressed to the receiving posts 44, and is thus fixed. After the position 48 is sandwiched together with a receiving plate 61 by means of the electrode tips 67, 68 of a welding gun 66, electricity is conducted thereto, whereby the work is welded indirectly.

Description

[Detailed description of the invention] This invention relates to indirect spot welding equipment.

As a conventional indirect spot welding device, there is one shown in FIG. 1, for example. In Figure 1, (1
) is a leg erected on the floor (2), and this leg (11
A base (3) is fixed to. A plurality of posts (4) are erected on the base (3), and these posts (4) support the workpiece (5) to be welded from below.

The object to be welded (5) is, for example, a door, which is composed of an outer panel (6) and an inner panel (7) stacked on the outer panel (6), and the outer circumferential flap is welded [ Same place (8). (9) is a plate attached to the post (4), and the plate (9) is a flat surface that fits the outer surface shape of the welding point (8) of the workpiece (5). have. The receiver is placed on the side base of the post (4) (
3) A bracket (10) is erected on the top, and an arm (11) is swingably connected to the tip of the bracket [10].

The rear end of the cylinder (13) is rotatably connected to the bracket [12] attached to the base (3), and the tip of the piston rod 04) of this cylinder (13) is connected to the arm (
11) is rotatably connected to the rear end. Arm (1
A plurality of plates (19) are attached to the plate (1), and a guide rod (16) is slidably inserted into each plate (151).A plate (19) is attached to one end of each guide rod (16).
A stopper (lη) that can come into contact with the guide rod 19 is attached, and an electrode plate (191) is attached to the other end of each guide rod (16) via an insulating material 08. Each plate <1
A compression spring (20) that biases the guide rod (16) toward the other end is provided between the 5+ and the insulating material (country). (22
1, and this plate (22) is connected to one secondary terminal (25) of the welding transformer (24) via a cable (23).
)It is connected to the. Said electrode plate Q! A conductive electrode (26) that can be pressed against the inner panel (outer surface) is attached to 11.These cylinders (13) and arms (11
), plate (15), guide rod (I6), electrode plate (1
The sickle, (22), spring (20), etc. are equipped with a pad mechanism (
34. (2η is an electrode tip that can be moved into and out of contact with each other (
2□□□ (29), this welding gun (2η electrode tip (28) & is connected to the other secondary side terminal 4311 of the welding transformer (2→) via a cable. .In a welding device with such a configuration,
First, the workpiece to be welded (5) is placed on the boss 4).

Next, the arm (11) is swung by protruding the piston rod α4) of the cylinder 03). Thereby, the conductive electrode (26) is pressed against the outer surface of the inner panel (7) by the elastic force of the compression spring (20). Next, the electrode tips (28) (29) of the welding gun (27)
According to 1, the welding point (8) of the object to be welded (5) is the plate (9).
) and then energized to perform indirect welding. Such a conventional welding apparatus has a problem in that the pad mechanism (321) is located above the post (4), making it difficult to take in and out the workpiece.

This invention was made by paying attention to the above-mentioned problem, and the object to be welded is assembled with the inner panel on the lower side and the outer panel on the upper side.
The object to be welded is positioned and fixed with a clamp that can be retracted to the side of the welded object at 2271, and the conductive electrode is pressed into contact with the inner panel from below, thereby solving the above problems.

The present invention will be explained below based on the drawings. FIG. 2 is a diagram showing an embodiment of the present invention. In the same figure, (4
1) is a leg installed on the floor (421), and this leg (
In season, the base (4 ri is fixed.Base (431)
A plurality of posts (44) are erected on the top, and these posts (44) support the workpiece (45) from below.

This object to be welded (451 is the lower inner panel (46
) and an upper outer panel (4η) overlaid on the inner panel (46), for example, a door,
The hood and trunk lid. This object to be welded (a flap is provided on the outer periphery of the grip, and the flap is joined by welding at a plurality of welding locations 08).

There are multiple guide rods (
49) are erected, and these guide rods (in the field, a pole plate 50 that moves up and down is slidably supported.
I has one secondary terminal (52) of the welding transformer (511).
1 is connected via a cable 63). Pole plate (5
0) is attached with a plurality of conductive electrodes (54). 6 are a plurality of compression springs as elastic members interposed between the electrode plate (50) and the base (4), and the receivers of these 6 compression springs are posts (covers placed on thin soil). The conductive electrode (54) is biased to be brought into pressure contact with the outer surface of the inner panel (46) of the workpiece (451). (!
i6) is a plurality of clamps attached to the post (44) near the folded part of the object to be welded (451), and each clamp (to) is a bracket fixed to the post (44J) (57 ).One end of the arm 69) is rotatably connected to the upper end of the bracket 67) via the pin side, and the other end of this arm is connected to the workpiece to be welded (the outer panel (4η welding point)). The bracket (61) has a surface (60) that matches the outer surface shape of the bracket (48).The base of the bracket (ei?) has a lever (63) through which a pin is connected. One end of the lever (6) is rotatably connected, and six rollers (6) are rotatably supported in the center of the lever (6), which can be engaged with recesses formed in the arm (59). 66) is a removable electrode tip (67)+6
The electrode tip of this welding gun 036) is connected to the other secondary terminal (10) of the welding transformer (511) via a cable (691).

Next, the effect will be explained.

First, place the outer panel (4 panels on top) and the inner panel (
Workpieces to be welded (451) combined with each other with 46) facing downward
The operator transports the receiver to the upper part of the boss [411].

Next, the conductive electrode 5 is connected to the workpiece (4ω) in this state.
4) Place it on top. At this time, since the electrode plate 60) is pushed up by the compression spring 69, the workpiece to be welded (4
51 is higher than Uke's post 04). Also,
When , the clamp 56) is in the unclamp position,
The lever (63) rotates in the direction of the arrow (A) around the pin trowel, and the arm (59) also rotates in the direction of the arrow (B) around the pin (t58) to move it to the side of the workpiece (451). Next, the arm of each clamp (56) is rotated in the direction opposite to the arrow (B) direction, and the plate (61) is brought into contact with the outer panel (4η welding point).Next Then, rotate the lever (63) in the direction of the arrow (N direction). At this time, the roller (65) presses the arm (59) against the workpiece (four compression springs 65). Then, when the roller (651 engages with the recess (6J) and the clamp (56) reaches the clamp position, the workpiece to be welded (the four supports are pressed against the post (44) and positioned and fixed. Next, the electrode tip (6η) of the welding gun (66) is applied to the welded object (four welding points GI81) after being compressed together with the receiving plate (61), and then energized.
Perform indirect welding. Next, the lever (63)
, rotate the arm (591) in the directions of arrows (A) and (B),
After retracting the clamp 56) to the side of the object to be welded (41), the object to be welded (451) is carried out.
Since the receiver is placed above the post (44) when the 4ω is loaded and unloaded, loading, unloading, and setting operations are facilitated.

As explained above, according to the present invention, the receiver can support the welded object assembled with the inner panel on the lower side and the outer panel on the upper side with the post, and can also retreat to the side of the welded object when unclamping. Since the object to be welded is positioned and fixed with a clamp, and the conductive electrode is pressed into contact with the inner panel from below, a large space is created above the receiver.

Therefore, the work of carrying in, carrying out, and setting the objects to be welded from above becomes easy, and is particularly suitable for small-volume production such as the knockdown method.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a conventional indirect spot welding device, and FIG. 2 is a schematic side view of an embodiment of the present invention. (44)...The receiver is the post (451...The object to be welded (46)
)...Inner panel (47)...Outer panel 6υ...Welding transformer (521...One secondary side terminal 64)...Conductive electrode (5 pieces...Elastic member 56)...Clamp (66)...Welding gun (six mark...electrode tip (70)...Other secondary side terminal patent applicant Nissan Motor Co., Ltd. agent Patent attorney March 17, 1957 Commissioner of the Japan Patent Office Shima 1) Haruki Tono 2 Name of the invention Indirect spot welding device 3 Relationship with the case of the person making the amendment Patent applicant address 2 Takaracho, Kanayō-ku, Yokohama-shi, Kanagawa Prefecture Name
(399) Nissan Motor Co., Ltd. 4, Agent 〒15
1 Address: 2-6-9-5 Yoyogi, Shibuya-ku, Tokyo, drawings subject to amendment

Claims (1)

[Claims] The support that supports the welded object, which is the combination of the outer panel and the inner panel, from below includes a post, a conductive electrode connected to one secondary terminal of the welding transformer, and a support so that the conductive electrode is brought into pressure contact with the inner panel. an elastic member that forces the
In the clamp position, the workpiece is pressed against the post to position and fix it, and in the unclamp position, the clamp retracts to the side of the workpiece and the outer panel is connected to the other secondary terminal of the welding transformer. An indirect spot welding device comprising: a welding gun having an electrode tip that comes into contact with the welding gun;