JPH0557346A - Strip welding equipment - Google Patents

Abstract

PURPOSE:To reduce the equipment cost and improve the reliability of a welded part by shifting a carriage to end part of the preceding material already cut with a plasma. CONSTITUTION:By executing cutting-off of rear end part of the preceding material 2a and front end part of the succeeding material 2b with a plasma cutting device 14, the equipment cost can greatly be reduced in comparison with the case of using a shearing device. Further, by shifting a welder device 1 side to passing direction of a strip matching to the rear end cutting off position, stopping time of feeding of the preceding strip 2a directly influenced to a tube- making line can do only at one time. Further, as a beveling working device composed of a milling cutter 10 is parallel arranged to the welding equipment 1, the high precise beveling shape can be given to the welding part of end part of the strip, and by relatively shifting a clamping device for holding and fixing the rear end part of the preceding material 2a and a clamping device for holding and fixing the front end part of the following material 2b to the passing direction of strip, adjustment of gap between the welding parts and sufficiently high welded strength can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, for example, in the preceding stage of equipment for continuously forming electric resistance welded pipes by molding hot strips, welds the tail end of the preceding material and the tip of the following material by welding. The present invention relates to a strip welding apparatus for doing the work.

[0002]

2. Description of the Related Art In equipment for forming hot strips and continuously producing electric resistance welded pipes, in order to continuously feed the strips without interruption, the tail of the preceding material is switched at the time when the coil is switched. The end and the tip of the following material are welded and connected.

On the other hand, since both ends of the strip wound around the coil generally have a low right angle accuracy, the end portions thereof are cut off by shirring prior to the welding process, and a groove for butt welding is applied. It At this time, the front and rear positions of the upper and lower blades of the shearing device are switched when the tail end of the preceding material is sheared and when the leading end of the following material is sheared, so that the inclination direction of the cutting surface is different. Then, this groove shape is obtained.

On the other hand, since the discontinuous portion of the weld bead of the electric resistance welded pipe has to be removed from the product, it is not preferable to temporarily stop the line in the pipe making process. However, in the case of a thick plate, since it is not possible to provide a sufficient margin for supplying the strip by using a looper, it is unavoidable to stop the feeding of the strip to the pipe forming equipment during the shearing process and the welding process. Therefore, a shirring device and a welding device are arranged side by side so that their mutual positions can be exchanged in a direction orthogonal to the sheet passing direction, and cutting of the strip end and butt welding can be performed only by stopping the strip once. The strip welding apparatus configured as described above has been put to practical use.

[0005]

However, the shearing device generally tends to be large in size because the cutting reaction force increases in accordance with the cutting thickness, and making the structure movable allows the equipment cost to increase. There is an inconvenience. Moreover, the groove shape formed by the shearing device that interchanges the passing direction positions of the upper blade and the lower blade as described above cannot be said to have sufficient accuracy in order to obtain high welding strength, and it is difficult to say that the welding portion There is a risk that the product will break, and in some cases, the productivity may have to be markedly reduced.

The present invention has been devised in order to eliminate such inconveniences of the prior art, and its main purpose is to reduce the equipment cost and further improve the reliability of the welded portion. It is to provide an improved strip welding device so that it can be enhanced.

[0007]

According to the present invention, there is provided a strip welding for connecting a tail end of a preceding material and a tip of a following material by welding in a continuous strip processing facility. The device is a tail end clamp device for holding and fixing the tail ends arranged side by side in the strip passing direction and a tip clamp device for holding and fixing the tip, and the device is orthogonal to the strip passing direction between both clamp devices. Of a groove cutting device and a welding device that are movable in a direction, a shift device for relatively contacting and separating both clamping devices, a plasma cutting device for a preceding material and a tip clamping device provided on the downstream side of the tail end clamping device. A plasma cutting device for trailing material provided on the upstream side,
This can be achieved by having a configuration including both clamp devices, groove processing device, welding device, shift device, and a plate passing direction moving carriage on which both plasma cutting devices are mounted.

[0008]

According to this structure, the groove processing device can be adjusted by moving the carriage with respect to the tail end of the preceding material that has been plasma-cut, so that the tail end of the preceding material is cut off. It is sufficient to stop the strip in the pipe making line only once from the step of performing the groove processing to finish the step of welding the tip of the trailing material.
In addition, the tail edge of the preceding material and the tip of the trailing material can be given a highly precise groove shape with a dedicated groove processing device.
By shifting the relative position of the clamp device that holds and fixes each of the tail end of the preceding material and the tip end of the following material, the gap of the welded portion can be set appropriately.

[0009]

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

1 to 3 show a general outline of a strip welding apparatus according to the present invention. This welding device 1
Is provided between a pipe making line (not shown) and the uncoiler, and is mounted on a carriage 4 which can travel a predetermined distance on a guide rail 3 extending along the strip passage direction. It has been placed. At the front-back position on the carriage 4 in the plate passing direction, the preceding material 2 is moved by the action of the hydraulic cylinder 5.
A tail end clamper 6 for sandwiching and holding the tail end of a and a tip clamper 7 for similarly sandwiching and holding the tip of the trailing member 2b are provided upright. And in the part between these two clampers 6 and 7,
A milling cutter 10 and a backing plate 11 mounted on a moving table 9 that slides along a guide rail 8 extending in a direction orthogonal to the sheet passing direction are provided (FIG. 2).

On the upper frame 7a of the tip clamper 7,
Welding torch 1 so that it can move in a direction orthogonal to the plate passing direction at a position aligned with the tip of clamped trailing material 2b.
Two are provided. Further, the upper frame 7a is provided with a plasma cutting device 13 for cutting the leading end of the trailing member 2b to straighten the leading edge.

On the upper frame 6a of the tail end clamper 6,
A plasma cutting device 14 is attached to cut the tail end portion of the preceding material 2a to straighten the tail end edge. The lower frame 6b is provided with a hydraulic cylinder type drive device 15 for shifting the position of the tail end clamper 6 in the plate passing direction into two steps, a groove processing position and a welding position. A worm jack type variable position stopper 16 is also provided on the lower frame 6b so that the welding gap can be accurately set according to the plate thickness.

A flip-up type movable apron device 17 is provided at each end of the welding device 1 and the welding device pit in the plate passing direction, and the opening of the pit is opened corresponding to the movement of the welding device 1. It is closed to ensure the running path of strip 2.

Next, the welding procedure by the equipment of the present invention will be described. In the initial state, both clampers 6.7
The carriage 4 is moved to the upstream full position with the tail end clamper 6 set to the groove processing position (see FIG. 1). In this state, the tail end position of the preceding material 2a is tracked by a payout length measuring machine (not shown) for the strip 2 and the pipe making line is stopped when it reaches the tail end plasma cutting device 14 position. Then, the plasma cutting device 14 is operated to cut off the tail end portion of the preceding material 2a to straighten the same portion. In parallel with this work, the next coil is set on the uncoiler, and the passing of the trailing material 2b is started.

When the tail end cutting is completed, the carriage 4 is moved toward the downstream side position (FIG. 3), the tail end of the preceding material 2a is passed through the tail end clamper 6 and then held and fixed. Then, the milling cutter 10 is operated to perform the groove processing of the tail end.

In parallel with this, the plasma cutting device for tip 1
If it is detected that the trailing material 2b reaches the third material 2,
The feeding of b is stopped and the tip is cut off. When the tip cutting is completed, the trailing material 2b is further fed,
The tip of the milling cutter 10 that has reached the processing position is held and fixed by the tip clamper 7, and the milling cutter 1
0 is operated to perform groove processing of the tip.

When the beveling of the tip is completed, the tail end clamper 7 is shifted to the welding operation position while the preceding material 2a is clamped, and the tail end and the tip are butted, and the backing plate is provided on the lower surface of the butted part. The moving table 9 is moved so that 11 is located, and then the welding torch 12 is operated to perform welding work. And once the welding is complete,
Release both clampers 6 and 7 and restart the operation of the pipe making line.

[0018]

As described above, according to the structure of the present invention, the tail end of the leading material and the tip of the trailing material are cut off by the plasma cutting device. Therefore, when the shearing device is used. In comparison, the equipment cost can be significantly reduced. Further, since the welding device side is configured to move in the plate passing direction in accordance with the tail end cutting position, the number of times of stopping the feeding of the preceding strip, which directly affects the pipe making line, may be one. Moreover, since the groove processing device composed of a milling cutter and the like is installed in parallel with the welding device, it is possible to give a highly accurate groove shape to the welded portion of the strip end, and a clamping device that holds and fixes the tail end of the preceding material. The gap of the welded portion can be accurately adjusted by relatively moving in the plate passing direction with a clamp device that holds and fixes the tip of the trailing member. Therefore,
Since it is possible to secure a sufficiently high welding strength, the possibility that the strip connection part will break during the process is extremely low, and the operating rate of the entire line including pipe making equipment is relatively low. The cost can be increased and a great effect can be achieved.

[Brief description of drawings]

FIG. 1 is an overall side view showing an initial state of a strip welding apparatus according to the present invention with a part thereof cut away.

FIG. 2 is a front view of a main part of an upper portion of the strip welding device according to the present invention viewed from the downstream side in the plate passing direction.

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

[Explanation of symbols]

 1 Welding device 2 Strip 2a Leading material 2b Trailing material 3 Guide rail 4 Truck 5 Hydraulic cylinder 6 Tail end clamper 6a Upper frame 6b Lower frame 7 Tip clamper 7a Upper frame 8 Guide rail 9 Moving stand 10 Milling cutter 11 Backing plate 12 Welding Torch 13 Plasma cutting device for tip 14 Plasma cutting device for tail end 15 Hydraulic cylinder type drive device 16 Variable position stopper 17 Movable apron device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B23K 37/00 F 7011-4E 37/02 A 7011-4E

Claims (1)

[Claims] 1. A strip welding apparatus for welding and connecting a tail end of a leading material and a tip of a trailing material in a continuous strip processing facility, wherein the strip welding devices are arranged in parallel in a strip passing direction. A tail end clamp device for holding and fixing the tail end, a tip end clamp device for holding and fixing the tip end, a groove processing device and welding that are movable between the clamp devices in a direction orthogonal to the plate passing direction. A device, a shift device for bringing the two clamping devices into contact with each other, a plasma cutting device for a preceding material provided on the downstream side of the tail clamp device, and a trailing device provided on the upstream side of the tip clamp device. A plasma cutting device for material, and a clamping plate moving device, a groove processing device, the welding device, the shift device, and a plate passing direction trolley on which the plasma cutting device is mounted. Strip welder according to symptoms.