JPH0663740A - Strip welding equipment - Google Patents

Abstract

PURPOSE:To secure a good enough welding strength by precisely executing a gap adjustment of welding part with relatively moving in line direction a clamping device to hold and fix the tip of succeeding material and a clamping device to hold and fix the tail of preceding material. CONSTITUTION:An equipment is provided with a downstream side clamping device 18 to hold and fix the tail of preceding strip and an upstream side clamping device 19 to hold and fix the tip of succeeding strip. With these clamping devices, an edge preparation device movable in perpendicular direction to line as well as a welding equipment 9 movable in perpendicular direction are provided. At groove machining the strip edge fixed on a movable clamping device, the strip edge is positioned by a edge preparation stopper 27, at setting up a welding gap between the tail of preceding strip and the tip of succeeding strip, positioning is done by a welding gap adjusting stopper. By this method, a high precision groove shape is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon dioxide gas arc at the tail end of a preceding strip and the tip of a following strip in the preceding stage of equipment for continuously forming electric resistance welded pipes by molding hot strips. The present invention relates to a strip welding device for performing a welding connection by welding or the like.

[0002]

2. Description of the Related Art In a facility for forming hot strips and continuously producing electric resistance welded pipes, in order to continuously supply the strips without interruption, the tail of the preceding strip is switched at the time when the coil is switched. The end and the leading end of the trailing strip are connected by welding. As a welding device for such a strip, a device for attaching a cutting device for previously cutting the abutting end faces of the preceding strip and the following strip, which are shear-cut in the previous process, before welding is disclosed in Japanese Patent Publication No. 2-35637. It is disclosed in the official gazette. According to this, the edges of both strips are brought into contact with a gauge bar to set a predetermined gap between both strips, and the edges of both strips are simultaneously cut by a rotating cutter, and then laser welding machine is used. Butt welding is performed.

[0003]

According to the above prior art, the squareness of the strip edge with respect to the traveling direction is deviated between the cutting of a relatively thin strip by the shearing device and the sending of the strip to the cutting device. When the strip edge is abutted against the gauge bar, it may be necessary to release the clamp to correct the strip bending. Further, if the plate thickness exceeds 6 mm, the load applied to the gauge bar also becomes large, so it is necessary to increase the strength of the gauge bar.

On the other hand, for example, when both end edges are cut at the same time with a single end mill sandwiched between the end edges of both strips, swarf with increased hardness is caught in the cutting surface,
Inconvenience occurs that the life of the cutter is significantly shortened.
On the other hand, if each edge is cut by a separate cutter, the cutter driving device and moving device tend to be complicated.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to reduce the load on the cutting device and to properly adjust the welding gap between the strip edges. It is an object of the present invention to provide a strip welding apparatus configured so that it can be set.

[0006]

According to the present invention, such an object is to provide a downstream side clamping device for holding and fixing the tail end of the leading strip and an upstream side for holding and fixing the leading end of the trailing strip. A side clamp device, a groove processing device movable between the two clamp devices in a direction orthogonal to the line, and a welding device movable between the both clamp devices in a direction orthogonal to the line, The structure of the strip welding device for welding and connecting the tail end of the leading strip and the tip of the trailing strip is such that one of the two clamping devices is a stationary fixed clamping device, and the other one is in the line direction. A strip that is composed of a movable movable clamp device and that is fixed to the movable clamp device at the time of groove processing of the end portion of the strip fixed to the fixed clamp device. A drive unit for moving the movable clamp device between a position where the part is separated from the blade of the groove processing device and a position where the leading strip and the trailing strip are welded, and the drive device is fixed to the movable clamp device. And a movable clamp device for adjusting the welding gap between the leading strip and the trailing strip after the groove is processed and a stopper for the groove processing for fixing the movable clamp device to the groove processing position of the strip end. And a welding gap adjusting stopper for locating the welding gap.

[0007]

According to this structure, when the strip end fixed to the movable clamp device is groove-processed, the strip end is positioned by the groove-processing stopper,
Similarly, when retracting the strip end, which is also fixed to the movable clamp device, from the cutting tool, it is positioned at the stroke end of the drive device and when setting the welding gap between the tail end of the preceding strip and the tip of the following strip. Are positioned by the welding gap adjusting stopper. As a result, a highly accurate groove shape can be given to the tail end of the leading strip and the leading end of the trailing strip, and it is possible to prevent the blade from hitting twice with respect to the leading strip, and moreover, a welding portion suitable for the plate thickness to be welded The gap can be set.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

FIG. 1 shows a strip supply facility provided with a welding device according to the invention. This strip supply equipment is provided in the preceding stage of the pipe making equipment (not shown) in the electric resistance welded pipe manufacturing equipment.

The strip supply equipment 1 includes an uncoiler 3 for rewinding a strip 2 wound in a coil shape, an opener 4 for opening the strip 2, and a side for regulating the widthwise position of the strip 2. Guide 5
And a leveler 6 to correct the curl of strip 2.
And a crop shear 7 for removing both ends of the leading end and trailing end of the trailing material of the strip 2, and a welding device 9 provided with side guides 8a and 8b on the inlet side and the outlet side thereof, respectively. A pinch roll 10 for giving an appropriate tension to the strip 2 and a looper (not shown) for storing the strip 2 and allowing the subsequent forming equipment to operate without stopping the supply of the strip even during the cutting / welding operation. And a guide roll 11 for guiding the strip 2 with respect to In addition to these devices, on the inlet side of the crop shear 7, a strip length measuring device 12 including a rotary encoder and the like for measuring the strip feed length, and a strip terminal detector 13 including a photoelectric tube and the like are provided. A plate width detector 14 including a CCD camera and the like is provided on the inlet side and the outlet side of the welding device 9, respectively.
15 is provided, and a strip length measuring machine 16 is provided on the exit side of the pinch roll 10.

As shown in FIGS. 2 and 3, the welding device 9 includes a downstream clamper 18 for holding and fixing the tail end of the preceding material 2a by the action of a hydraulic cylinder 17, and a trailing material 2b as well. Upstream clamper 19 for sandwiching and holding the tip of each of them, and these two clampers 18.1
The milling cutter 21 and the backing plate 22 provided on the moving table 20 that slides in the portion between 9 in the direction orthogonal to the line, and the guide rail 19a provided above the upstream clamper 19 in the direction orthogonal to the line. The welding torch 23 movably mounted on the hydraulic cylinder type drive device 24 for moving the downstream clamper 18 in the line direction, and the stopper 25 fixed to the base frame side fixed to the ground. Predecessor material 2
A worm-jack movable stopper 26 for adjusting the welding gap amount between the tail end of a and the tip of the trailing member 2b according to the plate thickness, and the downstream limit of movement of the downstream clamper 18 in two stages. Hydraulic beveling stopper 2 for switching
It consists of 7.

Next, the welding procedure by the equipment of the present invention will be described.

When the remaining amount of the preceding material 2a measured by the length measuring machine 12 on the inlet side of the crop shear 7 reaches a predetermined amount, the strip feeding speed is reduced and the strip terminal detector 13 in front of the crop shear 7 precedes it. When the passage of the tail end of the material 2a is detected, the trailing end of the preceding material is tracked by the length measuring machine 16 on the exit side of the pinch roll 10. And the preceding material 2a
When the tail end of has reached the crop shear 7, the tail end is sheared.

Next, when the arrival of the tail end of the preceding material 2a to the welding device 9 is detected by the tracking by the length measuring machine 16, the tail end is held and fixed by the downstream clamper 18, and the plate width detector is used. The welding torch 23 is made to stand by on the basis of the plate width information obtained at 15. At the same time, pinch roll 10
While feeding the preceding material 2a, the driving device 24 is retracted to pull the downstream clamper 19 to the downstream side. At this time, after the groove processing stopper 27 is projected to position the movement limit of the downstream clamper 18, the groove processing of the tail end of the preceding material 2a by the milling cutter 21 is performed. This milling cutter 21 is formed of a general-purpose blade according to the shape of the groove, and performs proper groove processing on the edge of the preceding material 2a in the forward stroke (movement from right to left in FIG. 2). be able to.

When the groove processing of the preceding material 2a is completed,
The groove side processing stopper 27 is immersed and the downstream side clamper 18 is inserted.
To the downstream side (about 2 mm).

On the other hand, for the trailing member 2b, the opener 4 is used.
After opening the tip of the coil from the coil and opening the leveler 6 to start passing the trailing member 2b (next coil), the leveler 5 is pressed down again. Then, the strip terminal detector 13
The tip of the trailing material 2b is accurately tracked by the strip length measuring machine 12, and when the arrival at the crop shear 7 is detected, the tip is sheared and removed. Further, the trailing material 2b is passed through the welding device 9, the trailing material 2b is centered with respect to the leading material 2a by the side guide 8a based on the information of the plate width detectors 14 and 15, and then the upstream clamper 19 is used. Is used to clamp the tip of the trailing member 2b. Then, in the backward stroke of the milling cutter 21, the groove processing of the following material 2b is performed. At this time, since the position of the downstream clamper 18 is moved to the downstream side, the milling cutter 21 does not have to contact the groove processed surface of the preceding material 2a.

When the groove processing of the trailing material 2b is completed,
After adjusting the protruding amount of the movable stopper 26 so that an appropriate welding gap corresponding to each plate thickness of the preceding material 2a and the following material 2b is obtained, the pushing speed of the drive device 24 is set to the following material 2b.
The returning speed of 1 is synchronized with the pinch roll 10 to shift the downstream clamper 18 toward the upstream clamper 19. When the downstream clamper 18 and the upstream clamper 19 are brought close to each other in this way, the tip of the movable stopper 26 comes into contact with the fixed stopper 25, and the leading material 2a and the trailing material 2b that have been groove processed are formed. The gap is set to a welding gap suitable for carbon dioxide arc welding.

Next, welding by the welding torch 23 is started. At this time, the backing plate 22 is raised to back up the lower surface of the joint portion of the strip 2.

When the welding is completed, the clampers 18 and 19 are released, the leveler 6 is pressed down, and the strip supply equipment is restarted.

According to the above construction, since the trailing material 2b can be threaded during the beveling of the tail end of the leading material 2a, the leading edge processing of the leading material 2a and the trailing material 2b is performed simultaneously. Lost time compared to the case can be minimized. Also,
In the above embodiment, the downstream clamper 18 is driven by the hydraulic cylinder, but it may be driven by an electric motor.

[0021]

As described above, according to the present invention, since the groove processing device including the milling cutter and the like is installed in parallel with the welding torch, it is possible to give a highly accurate groove shape to the welded portion of the strip end. Since the tail end of the preceding material and the tip end of the following material are individually cut, the cutting device does not need to be large and complicated. Then, by relatively moving the clamp device for holding and fixing the tip of the trailing member and the clamp device for holding and fixing the tail end of the preceding member in the line direction, the gap adjustment of the welded portion can be accurately performed, and the downstream clamp device is also provided. By switching the stop position of 2 in two steps, the milling cutter can be prevented from hitting the grooved surface of the preceding strip twice. Therefore, since it is possible to secure a sufficiently high welding strength, it is extremely unlikely that the connecting portion of the strip will break during the process, and since the life of the groove-cutting blade is extended, It is possible to exert a great effect in increasing the operating rate of the entire line including equipment.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a strip supply facility to which the present invention is applied.

FIG. 2 is an overall perspective view showing a milling operation state of the strip welding apparatus according to the present invention.

FIG. 3 is an overall perspective view showing a welding operation state of the strip welding apparatus according to the present invention.

[Explanation of symbols]

 1 Strip Supply Equipment 2 Strip 3 Uncoiler 4 Opener 5 Side Guide 6 Leveler 7 Crop Shear 8a / 8b Side Guide 9 Welding Equipment 10 Pinch Roll 11 Guide Roll 12 Strip Length Measuring Machine 13 Strip Terminal Detector 14 ・ 15 Plate Width Detector 16 Strip length measuring machine 17 Hydraulic cylinder 18 Downstream side clamper 19 Upstream side clamper 20 Moving table 21 Milling cutter 22 Backing plate 23 Welding torch 24 Hydraulic cylinder type drive device 25 Fixed stopper 26 Worm jack type variable stopper 27 Beveling stopper

Claims (1)

[Claims] 1. A downstream clamp device for holding and fixing the tail end of a preceding strip, an upstream clamp device for holding and fixing the leading end of a trailing strip, and a line between these clamp devices and orthogonal to a line. A groove processing device that is movable in a direction and a welding device that is also movable between the two clamping devices in a direction orthogonal to the line are provided, and the tail end of the preceding strip and the tip of the following strip are welded and connected. A strip welding device for use in which one of the two clamp devices is a stationary fixed clamp device, and the other is a movable clamp device that is movable in the line direction, and is fixed to the fixed clamp device. A position at which the strip end portion fixed to the movable clamp device is separated from the blade of the groove processing device during the groove processing of the strip end part,
A drive device for moving the movable clamp device between a position for welding the leading strip and the trailing strip, and the movable clamp device at a groove processing position of a strip end fixed to the movable clamp device. A groove stopper for fixing and a welding gap adjusting stopper for positioning the movable clamp device by adjusting the welding gap between the leading strip and the trailing strip after the groove is formed. Characteristic strip welding equipment.