RU2391193C1 - Method of arc welding of strips at continuous arc welding machines and device to this end - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention can be used for contact arc welding of strips at specialised arc welding machines installed in high-efficiency pipe welding and profiling plants etc. Common bed supports guillotine shears with top and bottom supports, internal centering device, welding torch and copper plate with strip ends clamps to position strips ends nearby welding zone. Proposed device comprises also carriage drive to move it in the guide and two centering devices with stripe ends clamps, pairs of rollers. Internal centering device is fixed on shears top support and arranged behind cutting axis. In preparation for welding, welding plate moves together with carriage in aforesaid guide inclined at 3-5°, moves a bit up to stop right behind strips butt. Arrangement of strips in their cutting with automatic removal of cut-off ends into box adds to device safety.

EFFECT: accuracy of centering and placing strips for welding.

2 cl, 5 dwg

Description

The present invention relates to welding production, and in particular to methods and devices for welding strips, performed on specialized machines that are installed in high-performance continuous metallurgical units, such as pipe welding and roll forming mills, pickling lines, etc.

Known welding machine with mechanized installation of strips / ed. testimonial. USSR No. 308837, class MPK5 V23K 101/16, 09. VII. 1969 /, including a bed on which the lower support and the upper support of scissors are mounted rotatably, as well as a centralizer made in the form of a cylinder, the piston rod of which is mounted on the stationary part of the bed in front of the cutting axis of the scissors, while the machine includes devices, which transfer strips with pre-cut ends from the cutting position to the welding position.

The disadvantages of this option for welding strips are associated with the need to create some reserve strips, in the form of loops, in front of and behind the welding machine for the smooth operation of the transmitting devices of the machine when installing strips. These loops are created by loop-forming mechanisms that are installed on both sides of the welding machine. Transport carriages and loop-forming devices increase the size and weight of welding machines and, in some cases, for example, during the reconstruction of metallurgical units due to lack of space in length, this creates difficulties with the use of such machines. In addition, an increase in the mass of the welding machine leads to an increase in the cost of its manufacture.

There is also a method of connecting the ends of the strips for welding and a device for its implementation / ed. testimonial. SU No. 1625638 A1, class В23К 37/04, 02/07/91 /, in which the first strip is fed all the way to form a bend on it, the strip is centered, the second strip is fed all the way to form a bend on it, centered, clamped, then the edges of both strips are cut and connected their turntables on both sides.

The disadvantage of this method and device is the need to withdraw the first strip behind the machine to raise the scissors to the cut position and feed the ends all the way to a narrow slot, which makes installation difficult, centering the strips with two centering devices when the bands are sickle-shaped requires rather complicated devices and time to eliminate the skew of the strips during installation , while cutting both ends of the strips simultaneously necessitates a doubling of the cutting force on the scissors, and a double cut complicates the maintenance of the scissors when setting up the knives.

Closest to the proposed invention in terms of technical nature and the achieved result is a method of welding strips and a machine for its implementation MCO 16.06, the design of which is described in the article by A. Novitsky and Mokeicheva V.G. “Strip welding in metallurgical production”, “Heavy engineering” No. 5, 2002, pp. 22-26. The method includes feeding the ends of the strips into the cutting zone, centering the rear and front ends with internal and external centering devices, trimming the ends of the strips with guillotine shears with upper and lower calipers, while after trimming both ends of the strips remain clamped in stationary clamps, and the welding device has the ability to move from the trim position to the weld position. The implementation of this method is carried out on a flash butt welding machine comprising a movable and fixed bed with clamps provided with clamping jaws, which is also equipped with two pairs of pulling rollers for feeding strips at the entrance and exit of the machine with the possibility of reversing.

The disadvantage of this method and device for its implementation is that the implementation of trimming the front end of the strips with the removal of the trimming of the strips requires a mandatory rotation of the lower caliper of the scissors, leading to a complication and weighting of the machine structure. For all known arc welding machines operating according to such a scheme, when cutting the front end of the strips, which fit in the cutting zone of the scissors from above onto the trimmed rear end, the trim is removed manually by the operator. This operation has not yet been mechanized.

In the present invention, the issue of achieving a technical result is solved by optimizing the preparation of the ends of the strips for welding with automatic removal of the trimmed end of the front strip, improving the arc welding machine with increasing accuracy in centering and installing strips for subsequent welding, simplifying machine maintenance and ensuring safe operation of the machine without application of additional nodes.

The technical result with the achievement of the above effect is ensured by the fact that in the method of arc welding of strips on machines of continuous metallurgical units, including feeding the ends of the strips into the cutting zone, centering the rear and front ends with internal and external centering devices, trimming the ends of the strips with guillotine shears with upper and lower calipers, however, after moving through the metallurgical line of the rear end of the previous strip, it is stopped near the cutting axis, the upper scissors support is lowered into the intermediate position and center the strip by reducing the first external and internal centering, clamp it with the first clamp, open the inner centering device and cut off the rear end of the strip, stop the upper scissor support in the lower position and lower the inner centering device, raise the upper scissor support to the upper position together with the internal centering clamp the back end of the strip, then the front end of the next strip is fed under the raised rear end of the previous strip and it is stopped near the cutting axis, the inner part is bred the centering device and the rear end are laid on the front one, lower the upper scissor support to an intermediate position, center the front end of the strip by mixing the inner and second external centering devices, clamp the strip in the second clamp, part the inner centering device and cut the front end of the strip, raise the upper support of the scissors up, move the welding lining with a torch to the joined strips, lower the clamps, raise the first and second clamps, open the external centering devices, then weld.

A device for implementing the proposed method is a welding machine containing guillotine shears fixed to a single carriage with upper and lower calipers, an internal centering device, a welding torch and a copper lining located under it with clamps of strip ends located near the welding zone, a carriage drive along the guide, as well as two external centering devices with clamps of strips in the form of pairs of rollers, while the internal centering of strips, mounted on the upper support of scissors, is located behind the axis of the cut In this case, the carriage drive is made in the form of a hydraulic motor, and the carriage travel guide is positioned at an angle of 3-5 ° towards the welding lining.

The inventive method of flash butt welding of strips and a device for its implementation are shown in figures 1, 2, 3, 4 and 5, where:

- figure 1 schematically shows the inventive welding machine (in the context of the axis) in the position of the cut with passing through it strips,

- figure 2 schematically shows the inventive welding machine (in the context of the axis) in the welding position with the stripes passing through it,

- figure 3 shows a cropping pattern of the previous end of the strip according to the proposed method,

- figure 4 shows the feed circuit for centering and trimming the subsequent end of the strip according to the proposed method,

- figure 5 shows a cropping pattern of the subsequent end of the strip according to the proposed method.

The welding machine contains guillotine shears 2 mounted on a single carriage 1 with upper 3 and lower 4 calipers, an internal centering device 5, a welding torch 6 and a copper lining 7 located under it with clamps of the ends of strips 8 and 9 located near the welding zone, a carriage drive 10 along the guide 11, as well as two external centering devices 12 and 13 with clamps of strips in the form of pairs of rollers 14 and 15, while the inner centering of strips 5, mounted on the upper support of scissors 3, is located behind the cutting axis, while the drive of the carriage 1 is made in the forma hydraulic motor 10, and the carriage 1 travel guide is positioned at an angle of 3-5 ° to the side of the welding lining 7. The back end of the machine 9 is equipped with mechanisms for longitudinal 16 and transverse 17 manual adjustments to the position of the strut. The machine also has supporting idle rollers 18 and ducts for scraps 19 on both sides of the cutting axis of the scissors 2.

The inventive method of arc butt welding in the inventive device is as follows:

- at the end of the processing of the roll in the metallurgical unit, the rear end of the previous strip 20 stops in the welding machine near the scissors 2;

- after moving through the metallurgical line of the rear end of the previous strip 20, it is stopped near the cutting axis of the scissors 2;

- lower the upper support 3 of scissors 2 to an intermediate position until the limit switch (not shown) trips and center strip 20 by converging the first outer 12 and inner 5 centering devices, clamp with the first clamp 14,

- bred the inner centering 5 and cut the rear end of the strip 20, while the trim falls into the box 19, installed in front of the cutting axis;

- stop the upper caliper 4 scissors 2 on the limit switch in the lower position and reduce the inner centering 5;

- raise the upper support 4 of scissors 2 to the upper position until it stops together with the rear end of the strip 20 clamped in the inner centering device 5;

- then feed the front end of the next strip 21 under the raised rear end of the previous strip 20 and stop it near the cutting axis of the scissors 2;

- bred inner centering 5 and the rear end of the strip 20 is laid on the front end of the strip 21;

- lower the upper support 4 of the scissors 2 to an intermediate position, center the front end of the strip 21 by reducing the inner 5 and the second outer 13 centering devices, while the inner centering 5 precisely aligns the front end of the strip 21 with the rear centered end of the strip 20, clamp the strip 21 in the second clamp fifteen;

- part the inner centering 5 and cut the front end of the strip 21, while the trim strip 21 falls into the box 19, installed behind the cutting axis either immediately after the cut or at the beginning of the movement of the carriage 1 in the welding position;

- raise the upper support 4 scissors 2 up to the stop;

- move the carriage 1 with the hydraulic motor 10 of the drive and, together with it, the welding lining 7 with the torch 6 to the joined strips 20 and 21 to the welding position, while the welding lining 7, moving along the inclined guide 11 at an angle of 3-5 °, is slightly lifted from the bottom up and stops exactly under the junction of the strips 20 and 21, while moving the carriage 1, the strips 20 and 21 support the idle rollers 18;

- lower the clamps 8 and 9, if necessary, manually adjust the position of the rear end of the strip 20 relative to the front end of the strip 21 by mechanisms 16 and 17, the first of which allows you to adjust the gap between the ends of the welded strips, and the second eliminates the lateral displacement of the welded edges of the strips;

- raise the first 14 and second 15 clamps, part the external centralizers 12 and 13, then carry out the welding;

- then raise the clamps 8 and 9 and give permission to transport the welded strips to the unit, and the carriage 1 is moved by a hydraulic motor 10 to its original position - the position of the trim strips and takes a position before the next welding.

Thus, the proposed method for arc welding of strips on machines of continuous metallurgical units, in which, after moving through the metallurgical line of the rear end of the previous strip, it is stopped near the cutting axis, the upper scissors support is lowered to an intermediate position and the strip is centered by reducing the first external and internal centering devices, clamped first clamp, part the inner centralizer and cut the back end of the strip, stop the upper scissor support in the lower position and reduce the inner centralizer, raise the upper scissor support to the upper position together with the rear end of the strip clamped in the internal centralizer, then feed the front end of the next strip under the raised rear end of the previous strip and stop it near the cutting axis, part the inner centering and the rear end are laid on the front, lower the upper support of the scissors in an intermediate position, center the front end of the strip by reducing the inner and second outer centering, clamp the strip in the second clamp, part the inner the centralizer and cut the front end of the strip, raise the upper scissors support up, move the welding lining with the torch to the joined strips, lower the clamps, raise the first and second clamps, open the external aligners, then carry out the welding, it allows us to solve the problem of optimizing the preparation of the strip ends for welding with automatic removal of the trimmed end of the front strip, eliminating manual scrap removal operations, which simplifies maintenance of the welding machine; and the implementation of the device for implementing the method using a machine for arc welding of strips of continuous metallurgical units, containing guillotine shears fixed to a single carriage with upper and lower calipers, an internal centering device, a welding torch and a copper lining located under it with clamps of the ends of the strips located near the welding zone , a drive to move the carriage along the guide, as well as two external centering devices with clamps of strips in the form of pairs of rollers, due to the fact that the inner centering of the strips, eplenny on the upper caliper scissors, located behind the cutting axis, wherein the carriage drive is configured as a hydraulic motor, and guide movement of the carriage is placed at an angle of 3-5 ° in the direction of lining welding, allows:

- to improve the arc welding machine with increased accuracy when centering and installing strips for subsequent welding without the use of additional machine components,

- facilitate the work and ensure the safety of staff,

- it is more efficient to use welding arcs, as well as machines using other types of welding, installed in high-performance continuous metallurgical units.

Claims (2)

1. A method of arc welding of strips in continuous metallurgical units, in which, after moving through the metallurgical line of the rear end of the previous strip, it is stopped near the cutting axis, the upper scissor support is lowered into an intermediate position and the strip is centered by converging the first external and internal centering devices, clamped with its first clamp, part the inner centering device and cut off the back end of the strip, stop the upper scissor support in the lower position and lower the internal centering device, raise the upper the scissor support is in the upper position together with the rear end of the strip clamped in the inner centering device, then the front end of the next strip is fed under the raised rear end of the previous strip and it is stopped behind the cutting axis, the centralizer is moved apart and the rear end is laid on the front one, the upper scissors support is lowered into the intermediate position, center the front end of the strip by reducing the inner and second outer centering, clamp the strip in the second clamp, part the inner centering and cut the front end c strips, lift the upper scissors support up, install the welding lining, placed together with the welding torch on a single carriage, under the junction of the strips by moving the carriage along the inclined guide, press the ends of the strips near the welding zone with clamps, lift the first and second clamps of the strips, open external centering and carry out welding. 2. A device for arc welding of strips in continuous metallurgical units, containing guillotine shears fixed to a single carriage with upper and lower calipers, an internal centering device, a welding torch and a copper lining located under it with clamps of the ends of the strips with the possibility of their placement near the welding zone, a movement drive carriages along the guide, as well as two external centering devices with clamps of strips in the form of pairs of rollers, while the internal centering of strips is fixed on the upper support of scissors and is located behind th cutting and guide movement of the carriage is tilted at an angle of 3-5 ° in the direction of the welding of the pad.

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