JPH037091Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a weld line copying device for a seam welding machine, and is particularly used for welding automobile fuel tanks, such as corners with narrow widths and large curvature radii. The present invention relates to a weld line copying device useful for automatically seam welding the entire circumference of a flange formed around the body of an elongated container having linear portions of different lengths.

[Prior art]

When seam welding the flange part of a press container such as a fuel tank, the flange part is pinched between a pair of seam electrodes, and the flange part of the welded part is rotated horizontally by the driving force of the electrodes. A weld line tracing device that guides the weld line between electrodes is often employed.

The pin guide type weld line copying device supports the workpiece at the front of the seam welding machine, and is equipped with a rotating plate that can freely move horizontally using a link mechanism. A belt-shaped plate cam on which a welding line is projected is provided, and this plate cam passes through a gap formed between two guide rollers fixed at a position below the seam electrode. A small-diameter guide roller guides the outside of the plate cam. Furthermore, a series of guide pins are attached at predetermined positions on the outside of the corner portion of the plate cam fixed to the rotary plate, and when the corner portion of the plate cam turns around the rotation axis of the inner guide roller, The guide pin pushes down the front wall and enters the groove of the guide rail provided below the electrode, and the guide pin inserted in the groove and the plate cam passing between the guide rollers guide the electrode at two points, directly attaching the electrode to the welding part. Stabilize the induction between.

[Disadvantages of conventional technology]

However, with this type of copying device, when welding a long and narrow tank with a narrow width, the rotating shaft of the rotary plate that rotates the workpiece by the driving force of the electrode interferes with the guide roller inside the guide device, making it impossible to weld. Cases will arise. In such cases, it is common to use inner guide rollers with a small diameter, but examples are also known in which semicircular fixed guide plates are used. In the former case, it lacks rigidity as a guide device, which is one of the factors that makes the movement of the weld line unstable. In the latter case, the semicircular guide surface of the guide plate and the inner surface of the corner part of the plate cam come into contact with each other for guidance, so the frictional resistance is higher than in the former case, which not only hinders rotational movement but also causes problems with the guide surface. will wear out quickly and will no longer be able to provide stable trajectory guidance. Therefore, in any case, there are limits to the structural design of the tank, and the design of a tank with a narrow and elongated shape has been forced to be changed.

[Purpose of this invention]

The present invention solves the above-mentioned drawbacks and enables automatic profile welding of narrow, long and narrow tanks, which were conventionally impossible to weld.This invention contributes to expanding the structural design of tanks and reducing their weight. The main purpose is to realize even more stable and wide welding.

[Summary of the invention]

The present invention provides a seam welding electrode that applies pressure and current to a seam weld line of a continuous flange part of a workpiece to be welded, which is a continuous corner part and a straight part, while holding the seam weld line from above and below.
A rotating plate that moves the workpiece horizontally by the driving force of the electrode, a plate cam similar to the seam weld line fixed in a band shape on the underside of this rotating plate, and both sides of this plate cam as described above. a guide device that guides directly below the electrode; a series of guide pins fixed at predetermined positions on the outside of the corner portion of the plate cam of the rotary plate; The guide device includes a guide rail configured to guide the plate cam in parallel and to move away from a predetermined position. A plurality of guide rollers are provided in a semicircular shape to correspond to the radius of curvature of the corner portion, and the inner surface of the plate cam is guided by a semicircular raceway surface formed by the plurality of guide rollers. It is in the welding copying device of the seam welding machine.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a rotary plate of a copying device of a seam welding machine according to the present invention, and FIG. 2 is a plan view showing the movement of a workpiece in an embodiment of the copying device. FIG. 3 is a front view of a guide rail and a guide device included in a part of the configuration of the copying device. The object to be welded W in the figure is an automobile fuel tank. Rotating plate 1 on which the workpiece W to be welded is placed and fixed
A rotating shaft 2 is provided at the center of the rotary plate, and this rotating shaft 2 is rotatably connected by a link mechanism that rotatably connects a plurality of arms 3. A plate cam 4 having a similar shape to the seam weld line of the flange portion of the object is fixed in a band shape.

A plurality of guide pins 5 are fixed in position on the rotary plate 1 located outside each of the corner parts a to d of the plate cam 4. Each pin 5 is rotated by a link mechanism, and the next guide pin 5 is rotated. is the front wall 7 of the guide rail 6
When it enters while pushing down, the front wall 7 returns to its original position and forms a guide wall to guide the guide pin that has entered the groove 8 parallel to the straight welding part.

A guide device 10 that guides both sides of the plate cam 4 directly under the upper and lower seam electrodes 9 includes a guide roller 11 that guides the outside of the plate cam 4, and a semicircular guide roller that is installed at a position opposite to this guide roller. It is equipped with a guide support member 12 and a plurality of guide rollers 13 to 17 arranged to form a semicircular raceway surface on the guide support member 12, and the plate cam 4 corresponding to the straight welded portion is The plate cam 4, which passes between the two guide rollers 11 and 13 and corresponds to the corner weld, is held between the guide roller 11 and a plurality of guide rollers 13 to 17 arranged in a semicircle. I will guide you.

Next, the operation of the present invention will be explained based on FIG. 2. The workpiece W to be welded is set on the rotary plate 1 so as not to move, the weld line of the flange of the workpiece is sandwiched between the upper and lower seam electrodes, and welding is started. When welding starts, the workpiece W to be welded together with the rotary plate 1 is rotated by the rotational driving force of the seam electrode 9, and the flange portion is welded by passing between the electrodes. When entering each corner,
The guide pins 5... come out of the grooves 8 of the guide rail 6, and the corner portion of the plate cam 4 is connected to the outer guide roller 1.
1 and a semicircular orbital surface formed by inner guide roller groups 13 to 17 to properly guide a curved welded part at a corner part.

When the corner is reached, the guide pin 5 presses down the front wall 7 from a predetermined position, enters the groove 8, and guides the straight welded portion by the two points of the guide device 10 and the guide pin 5. When linear welding is performed using this two-point guide, the rotating shaft 2 of the rotary plate 1 moves behind the semicircular guide support member 12, making it possible to weld narrow tanks.

[Effects of this invention]

The present invention is a guide device that guides a plate cam on a rotary plate directly below an electrode. Since we guided a group of guide rollers arranged to form a semicircular raceway surface opposite the guide roller that guides the outside, the guide surface rotates in the same way as when using normal guide rollers. In order to
Compared to conventional semicircular fixed guides, it is possible to reduce frictional resistance, prevent premature wear of the guide surface, and maintain mechanical rigidity. Therefore, even when manufacturing long and narrow tanks with narrow widths, the rotating shaft does not interfere with the guide device and stable and smooth trajectory movement is possible, just like with ordinary workpieces. It is possible to perform seam welding on a wide range of press parts, etc., making it possible to greatly contribute to expanding the structural design of tanks and reducing the weight of tanks.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a rotating plate of a weld line copying device according to the present invention. FIG. 2 is a plan view showing an embodiment of the present copying device and the movement of the workpiece to be welded. FIG. 3 is a front view showing the guide device and guide rail of the present copying device. Explanation of symbols, 1... Rotating plate, 2... Rotating shaft, 4
... Plate cam, 5 ... Guide pin, 6 ... Guide rail, 7 ... Front wall, 8 ... Groove, 9 ... Seam electrode, 10 ... Guide device, 11 ... Outer guide roller, 12 ... ...Semicircular guide support member, 13-1
7...Semicircular guide roller.

Claims (1)

[Scope of utility model registration request] A seam welding electrode applies pressure and electricity while holding the seam weld line of the continuous flange part of the corner part and the straight part of the workpiece from above and below, and the workpiece is leveled by the driving force of the electrode. a rotary plate that moves in a direction; a plate cam similar to the seam weld line fixed to the underside of the rotary plate in a band shape; a guide device that guides both sides of the plate cam directly below the electrode; A series of guide pins fixed at predetermined positions on the outside of the corner portion of the plate cam, and configured to allow the guide pins to enter from the predetermined position, guide them parallel to the straight portion, and leave the predetermined position. The guide device includes a guide rail, and the guide device guides the outer surface of the plate cam with a guide roller, and a guide support member disposed opposite the guide roller,
A plurality of guide rollers are provided in a semicircular shape to correspond to the radius of curvature of the corner portion, and the inner surface of the plate cam is guided by a semicircular raceway surface formed by the plurality of guide rollers. Welding copying device of seam welding machine.