JPS5835081A - Seam welding device - Google Patents

Abstract

PURPOSE:To weld strips from thin to heavy wall thicknesses with high performance by disposing a pair of pressurizing roller mechanisms which are freely attachable and detachable on both sides of rotary electrodes in a welding direction across the electrodes and setting the pressurizing forces thereof at the values at which objects to be welded deform plastically. CONSTITUTION:A seam welding device has a pair of rotary electrodes 41, 42 which are freely attachable and detachable to and from each other. A pair of pressurizing roller mechanisms 5, 6 which are freely attachable and detachable are disposed on both sides of the electrodes 41, 42 in the welding direction across said electrodes. If strips 9 are thinly walled, the pressurizing rollers 51, 52 of the mechanism 5 is held spaced and the electrodes 41, 42 and the rollers 61, 62 of the mechanism 6 are held pressurized. In such a state, the preceding and succeeding strips are welded and are deformed plastically by the mechanism 6. If the strips are heavily walled, the strips are deformed plastically with the mechanism 5, then the preceding and succeeding strips are welded with the electrodes 41, 42 and are further deformed plastically with the mechanism 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seam welding device for welding objects to be welded that are overlapped with each other.

Generally, the apparatus shown in FIG. 1 is used for lap-seam welding the rear end of a leading strip and the leading end of a trailing strip in, for example, a steel manufacturing line. That is, the cutting device 8 is attached to the underframe 2 at an angle of 01 M in a direction substantially orthogonal to the conveyance direction of the strip 9, for example, in the Y direction.
, the pressure roller mechanism 5 and the rotating electrodes 41 and 42 are disposed, and the cutting device 8 is installed with the underframe 2 positioned at the end in the Y+ direction.
The ends of the leading and trailing strips are then cut by a suitable mechanism, and then the ends 91, 92 of each strip are cut by a suitable mechanism. ! As shown in Figure 3 (al), the bolts are slightly wrapped. In this state, after the pair of pressure rollers 51 and 52 are brought close to each other, the underframe 2 is moved in the Y2 direction, and as shown in Figure 2 (a).
and Fig. 3 (as shown in the shadow), plastic deformation is applied to the lap portion at the end of the strip. After this step, the third
As shown in Figure 2, the strips 9 are spaced apart from each other by a small amount in the Seam welding is performed in the state shown in the figure, and the already welded part is plastically deformed by pressure rollers 51 and 52 so that it becomes flat.As a result, a relatively thick strip is welded. When welding a thin strip of After the edges of the underframe 2 are slightly lapped, the underframe 2 is moved in the Y!Y direction in the state shown in FIG. 1. That is, as shown in FIG. and rotating electrode 41.
With 42 separated, the underframe 2 moves in the Y-shaped direction.

After this, as shown in FIG.
The underframe 2 is moved in the Y+ force direction with the rotary electrodes 41 and 41 and 42 brought close to each other, and the strips are welded. If the step of imparting plastic deformation to the strip is not required before welding, a moving step is required to move the underframe from the end position in the Ys direction to the end position in the Y2 direction prior to the actual welding step. , Moreover, the larger the width of the IJ knob, the longer the migration time. In addition, in this type of welding equipment, the underframe becomes very heavy, so it is uneconomical to unnecessarily increase the driving force to move the underframe in the Y direction. The moving speed of the frame and the welding speed are configured to be approximately equal. By the way, as shown in Figure 1, Ll, Lt and Ls
When determining the Y of the underframe! Travel distance in Y direction; L is L*Ll+L! +L mouth ・・・・・・・・・・・・(1
It is indicated by 1. If the maximum width to which the strip can be applied is 1400 mm, for example, Lt-1600 mm, Lm = 2
00m, Lss=200w is selected, and therefore,
The above is 2000 m in L from equation (1).

Now suppose that the underframe travel and welding speed;■ is -9m/m
If it is assumed that i.sub.n, then a travel time of 13.3 sec.

By the way, when welding the ends of the strip, the conveyance of the strip to the welding device is usually stopped. That is,
During the welding operation, it is necessary to stop the new supply of strips to the appropriate strip processing line, which is a process subsequent to the welding process.

However, in general, in processes subsequent to the welding process, the strip is transported and processed at extremely high speeds, for example, 300 m/min, so regardless of the welding process,
In order to perform the above-mentioned post-processes continuously, a so-called looping device for stocking long strips must be provided between the welding device and the post-process device. By the way, for example, if we assume that the conveyance of the strip is stopped for 13.3 seconds, then L=13.
A looping device equivalent to 3 x 300 x 67 mG per kilometer is required, which has the drawback of increasing the cost of equipment for the strip processing line and increasing the area of the equipment. Therefore, it has been desired to reduce the welding time of the strike IJ tube as much as possible. By the way, as shown in Fig. 1, with conventional welding equipment, in addition to the actual welding time, the travel time of the underframe must be considered as the welding work time.
This is disadvantageous when welding thin strips.

On the other hand, the leading and trailing parts were cut without a cutting device installed on the underframe, but with a cutting device installed at a position different from the welding position.
There is also a welding device in which the J-tube is brought to the welding position, and the rear end of the leading IJ knob and the tip of the trailing IJ knob are positioned using an appropriate positioning mechanism and overlapped by a small amount. It is recommended. In this case, in order to smoothly position the end of the strip, the rotating electrode and pressure roller mechanism disposed on the underframe are retracted out of the strip conveyance line as shown in FIG. For this reason, when welding thin strips, the underframe must be allowed to move, similar to the apparatus shown in FIG. 1, which poses problems in terms of equipment costs and equipment area.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seam welding device that eliminates the above-mentioned conventional drawbacks.

That is, the object of the present invention is to provide a seam welding apparatus which can suitably weld thin to thick strips and can reduce the welding time in each case as much as possible.

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. In Fig. 4, 1 is a frame, 2 is a position determining means 3
The underframe is movable in the Y direction while being restrained by the frame, and is moved in the Y direction by a driving means (not shown). 4
1.42 is composed of a pair of rotation angle 1 poles that can be moved toward and away from each other. For example, the upper rotating electrode 41 is supported to move in the Z direction by a suitable driving means.

51.52 and 61.62 are pairs of pressure rollers disposed on both sides of the rotating electrode 41.42 in the welding direction, that is, in the Y direction, for example, pressure rollers 51 and 61.
are connected to driving means 53 and 63, for example, a hydraulic cylinder, and are supported movably in two directions. The above 51 to 53 and 61 to 63 constitute the first and second pressure roller mechanisms 5 and 6. Note that a cable 7.7 for feeding power to the rotating electrodes 41.42 is connected to, for example, an electrode support bracket (43.44).
Pressure roller support member 64.6 of second pressure roller mechanism 6
5 are supported in a non-contact state with electrode support brackets 43 and 44, respectively. 8 is a cutting device for cutting the end of the strip 9.

Next, I will explain the previous work. In FIGS. 4 and 5, the ends of the leading strip 91 and the trailing strip 92 are cut by the cutting device 8 with the underframe 2 positioned at the front end of Yr. A suitable mechanism, for example a ramp movable in the X direction, wraps each end of the strip 9 by a small amount, as shown in FIG. 3(a).

After this, depending on the thickness of the strip 9, the first pressure roller mechanism 5, the $2 pressure roller mechanism 6, and the rotating electrode 41.
42 is appropriately positioned and seam welding is performed. The welding work from the thin-walled first strip to the thick-walled fourth strip will be explained in four sections.

First, in the case of a thin first strip, the fifth body)
As shown in , the pressure rollers 51 , 52 of the first pressure roller mechanism 5 are in a separated state, and the rotating electrodes 41 . <2b The pressure rollers 61 and 62 of the pressure roller mechanism 6 of the section 2 are in a pressurized state. In this state, the lap portion of the first strip 9 is welded while the underframe 2 moves in the Y-shaped direction. This already welded portion is plastically deformed by the second pressure roller mechanism 6 and is formed relatively flat. Pressure rollers 61 and 62 press Y! of first strip 9! After passing the end in the Y direction, the welding work is completed. That is, the detector detects that the underframe 2 has moved to an appropriate position in the Y direction, and the output signal of this detector causes the first strip 9 to move in the x1 direction or in the XxX direction.
Direction conveyed. After welding, the rotating electrodes 41 and 42 and the pressure rollers 61 and 62 are set in a separated state, and then the underframe 2 moves to the end position in the Y1 direction, that is, to the retracted position. Of course, since the movement of the underframe 2 to the retracted position, that is, the movement, is carried out at the same time as the transfer of the IJ tube 9, there is no risk of adversely affecting the operation rate of the steelmaking line as in the conventional case.

Next, in the case of a relatively thin second strip belonging to the second category, as shown in FIG.
．． 42 and the pressure rollers 51, 52, and 61, 62 of the first and second pressure roller mechanisms 5 and 6, respectively, are maintained in a pressurized state, and the underframe 2 is moved to Y! Welding is performed by moving in the Y direction. That is, the strip 9 is wrapped around the lap portion and is plastically deformed by the pressure rollers 51 and 52, and the ends of the plastically deformed strip 9 are connected to the rotating electrodes 41 and 42.
Welded by This already welded part is the pressure roller 61°6
2, it is plastically deformed and formed relatively flat. After welding, the pressure rollers 51, 52 are separated and perform a similar operation as shown in FIG. 5(2).

Next, in the case of a relatively thick third strip belonging to the third division, the underframe 2 is moved in the Ym direction and the first strip is removed as shown in FIG. The pressure roller mechanism 5 applies plastic deformation to the lap portion at the end of the strip.After this process, the strips 9 are separated from each other by a small amount in the X direction as shown in FIG. As shown in Fig. 5 (ψ), the underframe 2 moves in the Y1 direction while maintaining the rotating electrodes 41, 42# and the pressure rollers 51, 52 of the first pressure roller mechanism 5 in a pressurized state to perform welding. will be carried out.

Furthermore, in the case of a thick fourth strip belonging to the fourth category, as shown in FIG. Apply plastic deformation to the lap part of the part. In this case, the first
If the pressure roller mechanism 5.6 and the second pressure roller mechanism 5.6 are made to cooperate, the plastic deformation becomes somewhat larger, so that it is more effective. After this step, the strip 9 as shown in FIG.
are separated from each other by a small amount in the X direction, and then as shown in Fig. 5(e).
The rotating electrodes 41, 42 and the first and second
Pressure rollers 51 and 52 of pressure roller mechanisms 5 and 6, respectively.
and 61 and 62 are maintained in a pressurized state to move the underframe 2 to Y+.
Welding is performed by moving in the direction. That is, the lap portions at the ends of the strip are further plastically deformed by pressure rollers 61 and 62, and the ends of the IJ tube 9 that have been plastically deformed again are welded by rotating electrodes 41 and 42. This already welded portion is plastically deformed by pressure rollers 51 and 52 and is formed relatively flat.

As shown in FIG. 4, for example, a support member 6 that supports the pressure roller 61 is attached to the second pressure roller mechanism 6.
If the rotary electrode 41 and the pressure roller 61 are connected by a hinge connection so that the axis of the drive means 63, for example, the axis of the cylinder rod of the hydraulic cylinder does not coincide with the axis of the drive means 63,
The distance between the two can be made as close as possible. Of course, if the driving means 53 of the first pressure roller machine 4J5 is similarly provided, the distance between the pressure roller 51 and the rotating electrode 41 can be made closer.

As described above, when welding the lap portions of relatively thin strips corresponding to the first and second sections, as shown in FIG. 5(a) and FIG.
Welding is performed while moving in the X direction, and the underframe is in Y! After reaching the end in the X direction, the strip can be conveyed in the X direction regardless of the movement of the underframe in the Y1 direction. In other words, since the movement of the underframe in the Y+ direction is carried out at the same time as the conveyance of the strip, there is no need to consider the movement time of the underframe. Therefore, the welding work time can be approximately half of that of conventional equipment, so the welding process and post-process The looping device disposed between the two may be of small capacity.

Further, as shown in FIG. 5(C) and FIG. 5(e), the lap portions of the ends of the strip that have been plastically deformed are separated from each other and then plastically deformed again, and then seam welding and Since the already welded portion is subjected to plastic deformation processing, it is possible to weld a thicker strip than that which can be seam welded with conventional equipment.

According to the invention, it is possible to weld strips from thin to thick with one welding device with high performance, and especially when welding relatively thin strips, welding that stops the strip Since the time required is approximately half that of conventional methods, the capacity of the looping device installed between the welding process and the post-process can be reduced, reducing the equipment cost of the strip processing line and reducing the equipment area. I can do it.

[Brief explanation of the drawing]

Figure 1 is a front view of the conventional device, Figures 2 (-) to (C) are explanatory diagrams of the operation of Figure 1, and Figures 3 (a) to (C) are strip welding operations of IJ tube material. Fig. 4 is a front view showing an embodiment of the present invention, and Figs. 2... Underframe, 41.42-... Rotating electrode, 5, 6-
...First and second pressure roller mechanisms, 9,91.92
···strip. Agent Patent Attorney Hiroshi Nakai Figure 5 51 Continued from page 1 Applicant Osaka Transformer Co., Ltd. 2-1-11 Tagawa, Yodogawa-ku, Osaka City

Claims (1)

[Claims] 1. In a seam welding device equipped with at least one pair of rotating electrodes that can approach and separate from each other, at least one pair of pressure roller mechanisms that can move toward and away from each other are arranged on both sides of the rotating electrodes in the welding direction. a seam welding apparatus, wherein the pressure roller mechanism is configured to have a pressure roller mechanism whose pressure force is set to a value that causes plastic deformation of the welded object.