JPS58224083A - Automatic profiling device of seam weld line - Google Patents

Abstract

PURPOSE:To make a titled device cope sufficiently with any shape of a weld line, by adopting not only a plate cam guide system but also a pin guide system, in a seam weld like automatic profiling device. CONSTITUTION:When welding is started, a plate cam 8 of a rotay plate is guided by a guide device 13 by rotate-driving force of an electrode, and simultaneously, a guide pin 9 moves in parallel to a weld straght line part along the guide groove. When a start point of a welding corner part reaches an electrode pressure point, the corner part of the plate cam 8 is guided by the guide device 13 and starts its rotating movement. At this start time, the guide pin in a guide rail 11 comes out so as to go round the outside of the guide device 13 from the rail end port. In this way, a welding curve corresponding to said corner part is guided to the electrode pressure point. When said guide pin finishes going round the corner part, the following guide pin 9 gets over a ratchet device provided on a prescribed position of the guide rail 11, advances into a guide groove 12, and thereafter, moves along the guide groove while the straight line part of the plate cam 8 is guided and passes through the guide device. Thereafter, it goes round by operating in the same way.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a continuous flange portion formed at the periphery of a sealed container, such as a radiator or a gasoline tank, consisting of a straight line portion and a corner portion. This invention relates to an automatic seam weld line tracing device that applies pressure and current between electrodes and guides the seam weld line between the electrodes using electrode driving force.

In conventional devices of this kind, for example, a rotary plate is provided in the link mechanism so as to be able to rotate, the object to be welded is fixed above the rotary plate, and the welding line is traced below the rotary plate. A so-called plate cam guide method is generally known in which a temporary cam is passed through a gap between a guide roller and a guide plate fixed in position directly below the seam electrode to guide the regular welding line between the upper and lower seam electrodes. There is.

Recently, in place of the above temporary cam guide system, a bin guide system has been proposed, for example, as disclosed in Japanese Patent Publication No. 52-22746 and Japanese Patent Publication No. 54-3012. In this bin guide method, a half-moon cam is installed at the center of the bend of each corner corresponding to the weld line of the workpiece, and the movement of the straight part of the weld line is controlled by fixing the cam below the seam electrode. The rotation of the corner of the weld line is performed by engaging and rotating a half-moon cam with a cam stopper provided at a position intersecting the electrode rotation axis of the guide rail. However, it is a characteristic.

However, in the case of the former plate cam guide method, knocking is likely to occur due to mechanical inertia, and moreover, overswiggling occurs when the welding line is deviated from the electrode position when going around the corner. Also often.

On the other hand, in the case of the latter bin guide method, the former
Although no serious accidents have occurred, it is necessary to align multiple half-moon cams with the center position of each corner of the welding line, so for example,
As shown in Publication No. 012, when a polygonal wave weld including corner parts with different radii is to be welded, the mounting position of the half-moon cam is different depending on the radius. In addition to requiring a cam stopper, it is quite difficult to adjust the height of the half-moon cam and the positioning of the cam stopper, and the construction is complicated. When dealing with a polygonal shape consisting of weld lines with small differences in radius, it is necessary to provide cam stoppers in multiple rows according to the position of the half-moon cam (this is impossible in principle, as it is impossible to do so). Ta.

The present invention incorporates a bin guide method in addition to the conventional plate cam guide method.By doing so, the problems of the past can be prevented, and the size of the radius of the corner part of the weld line and the length of the straight part can be improved. We have developed an automatic seam weld line tracing device that can be called a universal seam weld line and can fully handle any shape of weld line, regardless of the size of the corner angle.

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

In Figures 1 to 3, (1) in the figure is the welding machine main body (2).
X3) is the upper and lower seam electrode, (4) is a rotating plate, which can freely rotate in the horizontal plane in front of the seam electrode by a link device that rotatably connects a plurality of arms (5). It is attached to the bearing (6) at the end of the arm. In this example, the object to be welded is a gasoline tank.

The flange portion formed around the body of this tank has corner portions (a) to (i) with the same radius but different bending center angles (θ).
and linear parts (a) to (su) of different lengths. (8) is a temporary cam, which is a projection of the flange of the tank.

This plate cam is fixed to the -F side of the rotating plate (4).

(9) is a guide pin. This pin is on the i board (4)
installed on. The mounting position varies from the straight part (a) of the cam plate (8) to the corner part (a) as shown in Fig. 41ζ.
It is located outside the straight line (A-A) that passes through the starting point (a') of moving to l and its corner (the center point of bending (P2) of al), and the curve of the above corner (a) Central angle (θ
) is fixed at any set position except for the fan-shaped portion (l) drawn inside the inner radius line (rXr) of the plate cam that constitutes the plate cam. The position is the adjacent corner part of the cam plate (8), for example, the bending center point Ps of (al and tt>),
Take an arbitrary value y outside P2 at right angles to the straight line (B''-B) connecting P2, and take an arbitrary value X outside P2 (however, the center point P2 and the value of ), each guide pin (9
a) to (91) are fixed in position.

Any distance x-y is 1. A constant selection will be made at each corner.

Reference numeral (11) denotes a guide rail into which a guide pin enters at the end of rotation for corner welding to provide parallel guidance during straight welding. This guide rail consists of a front rail plate (lla) and a rear rail plate (llb), and is formed with a guide groove (12) having a width that allows only the guide pin (9) to pass through. - It extends long in the direction perpendicular to C.

(13) is a guide device that guides the plate cam in the vicinity of the electrode rotation axis so as to sandwich the plate cam from both sides.

This guide device consists of a rotating roller (13a) that contacts the inside of the temporary cam with the same R surface as the corner portion, and a small diameter rotating roller (isb) that contacts the outside surface of the plate cam. The two rollers are mounted on the support plate (14) in opposite directions with a gap sufficient to allow the passage of the plate cam. (15) is a latinite device that allows the opening/closing plate (16) to be moved freely, and this device is a front rail plate (lla
) is provided at the location where the guide pin (9) enters. When the guide pin enters the guide rail, the guide pin does not press down on the opening/closing plate, but jumps over it, and then the opening/closing plate returns. When each guide pin pushes this stopper open and passes one after another, After welding is completed, it serves as a stopper to return the welding start point to the electrode pressurizing point to the original position.

(18) is a drive cylinder. This is a support for one side of the entire guide rail, a driving source for swinging the shaft (19) toward the front side of the center electrode, and is attached to the welding machine main body. This was devised to facilitate the loading and unloading of objects to be welded.

The operation of the present invention will be explained below with reference to FIGS. 1 and 4.

First, the work to be welded (7) is set above the rotating plate so that it does not move. Then, the welding line of the object to be welded is sandwiched between the upper and lower seam electrodes from a predetermined position, and the electrodes are rotated while applying a constant pressure and current to start seam welding along the welding line.

The arrow (→) indicates the direction of welding progress.

To start welding from the planned position of the welding straight part (a), return the guide pin (9a) to the stopper (17) of the guide groove (12) of the guide rail (11) and return it to the original position. By stopping, the starting position of the welding line is set. When welding is started in this way, the plate cam (8) of the rotary plate is guided by the guide device 0 by the rotational driving force of the electrode, and the guide pin (9a) is moved along the guide groove parallel to the welding straight section by the arrow mark. Move in the (→) direction. When the starting point of the welding corner reaches the electrode pressurizing point, the corner (a) of the temporary cam begins to rotate while being guided by the guide device. At the start of this IG guide pin (9) in the guide rail.
A) exits from the rail end opening by going around the outside of the guide device as shown by the arrow (A).

In this way, the welding curve corresponding to the previous corner (a) is guided to the electrode pressurizing point. and corner part (a)
When the next guide pin (9b) is turned around, the ratchet/soto device (15) is installed at a predetermined position on the guide rail.
The plate cam passes through the guide groove and then moves along the guide groove while the straight part (b) of the plate cam passes through the guide device.

The welding work is completed by repeating the same operation once.

Therefore, according to the present invention, the following effects can be obtained.

(1) Since the rotational guidance of the weld line corner part is performed by a plate cam and a rotational guide device, each R
There is no need to add any mechanism even if the values are different (and moreover, more stable rotational movement can be obtained compared to the conventional bin guide method).

(2) Since a guide rail on the exit side is not required, design and maintenance are very advantageous.

(3) It is no longer necessary to change the height of the half-moon cam, provide a step on the exit side of the guide rail, or perform difficult positioning adjustments of the cam stopper as in the conventional bin guide system.

, (4) In the conventional bin guide method, the applicable range was limited by the bending center angle (θ) and radius (rl) of the corner part of the workpiece or the distance of the straight part, but with the method of the present invention, Since the value of Xy can be arbitrarily determined regardless of the corner angle and the distance of the straight radius part,
The lever principle eliminates all reaction force, providing stable and accurate operation, making it suitable for high-speed welding.

(5) Another great feature is that the plate cam system currently in operation can be easily improved to the system of the present invention by simply adding guide pins and guide rails according to the present invention to the conventional plate cam system.

(6) Compared to the conventional roller cam system, there is no need for shape processing to change the thickness of the half-moon cam or for the use of multiple cam stoppers.

As explained above, the present invention enables welding tracks of any shape to be guided and driven accurately to the electrode pressurizing point at a stable speed, has a simple structure, is cost-effective, and is easy to operate. We provide a new type of automatic seam weld line tracing device that has significant effects in terms of shortening takt time, stabilizing welding quality, safety, and reducing manufacturing man-hours by 9 and maintenance.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the profiling apparatus according to the present invention, and FIG. 2 is the same (schematic front view, first
Figure 3 is the same (schematic side view; Figure 4 is a schematic plan view for explaining the operation of the device of the present invention showing the positional relationship between the guide bin and the plate cam. [Explanation of symbols] (1-) ... Seam welding machine (2X3) ... Seam electrode (4) ... Rotating plate (8) ... Plate cam (9) ... Guide pin (11) ... Guide rail (13) ...・Guide device procedural amendment (method) October 19, 1980 Director of the Patent Office Kazuo Wakasugi 2, Name of the invention Seam weld line automatic tracing device 3, Person making the amendment September 28, 1988 (Kyoen J)

Claims (1)

[Claims] A seam weld line consisting of arbitrary corner parts and straight parts continuously formed around the workpiece is pinched and energized between a pair of upper and lower seam electrodes, and the seam weld line is welded in a horizontal plane by the driving force of the electrodes. This is a welding device that continuously performs seam welding by guiding the target seam weld line between the electrodes while rotating the welding device. A temporary cam similar to the above-mentioned weld line,
A guide device that guides both surfaces of the plate cam on the rotational axis of the electrode, a series of guide pins fixed in position near the temporary cam of the rotary plate, and a guide pin that enters from a predetermined position and It consists of a guide rail that is configured to guide parallel to the straight section and move away from a predetermined position, and each guide pin is substantially connected to the starting point of the plate cam from the straight section to the corner section and the bending center of the corner section. outside the straight line (A-A) passing through the point, and excluding the fan-shaped range drawn inside the inner radius line of the plate cam that constitutes the bending center angle (θ) of the above corner part. (Seam weld line automatic tracing device characterized by being fixed at any set position.