RU2471598C1 - Method of welding machine electrode cleaning by trimmer - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention may be used for trimming strips in contact butt welding performed at special welding machines used for enlargement of reels and continuous operation of metallurgical plants. Slag and upset metal are removed from top and bottom of strip butts in heated state by introducing built-in lever-type cutter trimmer in between electrodes. Slag and upset metal removed, side surfaces of electrodes are cleaned by cleaning elements secured at every lever of aforesaid trimmer. Top electrodes are lifted to move trimmer levers apart to position whereat cleaning elements get in contact with electrodes. Then trimmer is moved into initial position to make cleaning elements clean electrode sides of adhered particles of fused metal and slag.

EFFECT: higher quality, ease of welding machine servicing.

1 dwg

Description

The invention relates to welding production, and in particular to devices for stripping joints of strips in flash butt welding by fusion, performed on specialized welding machines installed in the rolling mill for enlarging coils and ensuring the continuity of operation of metallurgical units.

Periodic welding of rolls of strips specified in pickling units allows to increase the weight of pickled hot-rolled rolls supplied for rolling, and welding of rolls in the head of cold rolling mills ensures their continuous operation, while the duration of the joining of the rolls should not allow stops or slowdown of the speed of operation of the units. High productivity of welding machines under these conditions is achieved due to automation of the welding process and acceleration of auxiliary operations, in particular, the operation of removal of weld from welded joints, which is necessary before rolling them. The removal of burrs is carried out by the tool burr built into the welding machine, which cleans the welded joint with two cutters (above and below the strips) immediately after welding.

Known cutter type cutter (see, for example, AS SU No. 254681, B23K, 1973), built into the welding machine, in which cutter heads with cutters are fixed at the ends of two beams equipped with drives for their information and longitudinal movement, and support rollers installed on both sides of the cutters, which determine the position of the cutting edges of the cutters relative to the strip surfaces, which allows not to rearrange the stripper when changing the thickness of the welded strips.

The disadvantage of this scraper is the instability of the stripping of the burr due to frequent hit of detachable shavings under the support rollers, which leads to the lifting of the rollers and skipping the cut when stripping the burr.

Also known is a device for stripping joints of strips in flash butt welding in a butt welding machine, designed for welding strip coils in metallurgical units (see, for example, AS SU No. 1073038, B23K 11/02, publ. 15.02.84, Bull. No. 6). A pick tool head containing a tool holder, two support rollers mounted coaxially on it for contacting the welded strips and a tool fixed between them, the head being equipped with cheeks mounted on both sides of the tool and a U-shaped chip pick-up groove between them to prevent chips from getting under the chip support rollers.

The disadvantage of this device is the need to remove chips that fell between the support rollers and the cutter. This is a laborious manual operation, especially after cooling the metal chips. Manual operation is also the cleaning of the side faces of the electrodes from adhering particles of molten metal. The side faces of the electrodes must be cleaned regularly, since sticky particles of molten metal lead to burning and failure of the electrodes of the welding machine.

There is also known a method of stripping the connection of strips in flash welding and a device for its implementation (see AS SU No. 1276459 A1, B23K 11/04, publ. 15.12.86, Bull. No. 46). A device for stripping joints of strips comprises a carriage with a drive for moving it, two pivotally connected to a lever carriage, on each of which axles with two support rollers and cutters located between them are mounted. Two metal brushes are installed in front of the cutters, which, when stripping the burr, remove the sintered particles of the melt and oxides from the joints, then blown out with compressed air from the space between the support rollers, and then the burrs are cut off. In addition, in the process of cutting the burr of the brush, the side faces of the electrodes of the welding machine are cleaned.

The disadvantage of this method when removing melt particles from the side faces of the electrodes before stripping the burr with blowing the particles with compressed air is the intensive cooling of the joint metal from blowing it with air with the formation in some cases, especially when welding carbon strips, quenching structures in and near the joint, which makes impossible to roll it in a cold rolling mill without heat treatment. In addition, metal particles blown by a stream of compressed air from the gap between the electrodes are unsafe for service personnel and lead to contamination of a large area near the welding machine from the service side. Reducing the intensity of the air supply leads to the fact that some of the particles nevertheless fall under the support rollers and cause a cut pass, not ensuring high-quality cleaning.

The technical result of the invention is to improve the quality and service conditions of the welding machine due to mechanized stripping of the side faces of the welding electrodes with a scraper, in which the stripping operation does not increase the time of joining the strips, since it is not included in the welding cycle.

The technical result is achieved by the fact that in the method of stripping the electrodes of the welding machine with a scraper, which consists in the fact that after flash butt welding by fusion, the connection of the strips is processed in a heated state, while the side faces of the electrodes of the welding machine are cleaned with stripping elements located on the scraper and also remove slag and the landed metal of the joint at the top and bottom of the strips, a lever cutter, which is built into the welding machine, after the filler is inserted into the space between the electrode mi and stripping, raise the upper electrodes of the welding machine and at the same time spread the levers of the stripper to a position in which the stripping elements attached to each lever come into contact with the electrodes of the welding machine, then give a command to return the stripper and, when it moves to its original position, the strippers the elements clean the surfaces of the side faces of the electrodes from adhering particles of molten metal and slag.

The inventive method of cleaning the electrodes of the welding machine with a scraper is shown in figure 1, where:

- figure 1, A schematically shows a side view of the filler of a welding machine at the time of stripping;

- figure 1, B schematically shows a side view of the filler of the welding machine after stripping the burr at the time of raising the electrodes and diluting the levers of the filler;

- figure 1, In schematically shows a side view of the filler welding machine at the beginning of the cleaning of the electrodes;

- figure 1, D schematically shows a side view of the filler welding machine at the end of the stripping of the electrodes.

The inventive method of cleaning the electrodes of the welding machine with a scraper is as follows:

- after welding the strips 6, intercepting and clamping the junction in the electrodes 5 of the welding machine for free passage between the electrodes 5 of the levers 1 and the support rollers 2, include a drive for moving the levers 1 of the puller (not shown conditionally in Fig. 1) and enter into the space between the electrodes 5 welding machine supporting rollers 2 and levers 1 of the filler, begin to cut the cut with cutters 3 above and below the strips 6 (see figure 1, A);

- then, after stripping the grata, the puller is stopped and the upper electrodes 5 are raised and the levers 1 of the puller are pulled apart (see Fig. 1, B) to the position where the stripping elements 4 will not come into contact with the side faces of the electrodes 5 of the welding machine;

- then turn on the drive for moving the levers 1 of the filler and begin to clean the electrodes 5 of the welding machine when the filler moves to its original position before welding (see Fig. 1, C, D).

Since the welded strip begins to enter the storage ring immediately after raising the electrodes, the time for stripping the electrodes with a stripper is not included in the general cycle of strip joining and does not affect the performance of the metallurgical unit.

Thus, the proposed method of stripping the electrodes of a welding machine with a scraper allows:

- improve the quality and service conditions of the welding machine due to mechanized stripping of the side faces of the welding electrodes;

- completely eliminate the manual operation of stripping the welding electrodes, while the operator of the welding machine can completely concentrate on transporting the strips to the storage device and on feeding the front welded end of the strip.

The proposed method for stripping the electrodes of a welding machine with a scraper can be used not only on machines for welding strips for rolling, but also in machines installed in high-performance pipe and roll forming units.

Claims (1)

A method for processing the connection of strips after flash butt welding by fusion with the cleaning of the electrodes of a welding machine, including the removal of slag and metal deposited above and below the joint of the strips in the heated state by introducing into the space between the electrodes of the lever tool cutter integrated into the welding machine and cleaning the side faces of the electrodes of the welding machine by stripping elements attached to each lever of the said scraper, characterized in that the cleaning of the side faces of the electrodes is carried out t after removal of the slag and the metal deposited, the upper electrodes of the welding machine are lifted and at the same time the levers of the stripper are moved to the position in which the stripping elements come into contact with the electrodes of the welding machine, after which the stripper is moved to its original position, during which the stripping elements are cleaned the surface of the side faces of the electrodes from adhering particles of molten metal and slag.

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