SU588026A1 - Roll stand of tube cold-rolling mill - Google Patents

Description

(54) WORKING STICK OF COLD PIPE ROLLING MILL

one

The invention relates to pipe production and can be used when replacing rolls in the working cages of single and multi line cold rolling mills.

A working stand of a rolling mill is known, comprising a frame with a connector in a vertical plane parallel to the plane of the rolls, having semi-cylindrical grooves for the roll supports, and covers that simultaneously fix one-sided supports of the rolls 1.

A disadvantage of the known stand is the considerable time required for transshipment. To replace one defective roll, it is necessary to remove the covers and remove both rolls.

The closest known solution is a working stand containing a stationary bed with upper and lower supporting bars, a cassette mounted movably in the axial direction, having working and supporting rolls with bearing supports in rectangular housings 2.

The disadvantage of this stand is that in the moving cassette of the stand there is one common window in which the sub-support supports of all work rolls and support rolls are mounted. The change of rolls in this stand is possible only with the obligatory disassembly of the stand. So when changing the lower rolls required excavation of the upper rolls. Such a roll change is costly to disassemble. Since in the cold rolling mills of pipes due to large dynamic and technological loads, the change of rolls is a frequent operation, the loss of time for these operations is a large percentage.

The aim of the invention is to provide the possibility of replacing any of the rolls and thereby reducing the time of transshipment.

This is achieved by the fact that, in the proposed working stand of the cold rolling mill tube, the cassette is made with grooves in the number and shape of bearing support frames and provided with lids closing the grooves in a plane parallel to the axial vertical plane of the rolls and securing the latter from lateral horizontal displacement.

FIG. 1 shows the proposed working stand, side view; in fig. 2 shows section A-A in FIG. I; in fig. 3 shows a section BB in FIG. one.

The working stand of the cold rolling mill contains a stationary bed 1 with upper and lower support bars 2 and a cassette 3 mounted therein movably in the axial direction, which has workers 4 and support 5 rolls with sub-supports b in rectangular housings 7. The cartridge 3 is made with grooves 8 according to the number and shape of the housings 7 bearing supports 6 and provided with covers 9,

which close the grooves 8 in a plane parallel to the axial vertical plane of the rolls, and fix the rolls from lateral horizontal displacement. In the stationary frame 1, rails 10 are mounted, which engage with drive gears 11 support rolls 5, through which they are kinematically connected with work rolls 4 by means of gears 12 and balancing springs 13 are mounted between bearing supports b of work rolls 4.

The cage works as follows.

The cassette 3 is reciprocated from the drive mechanism (not shown in the figures), which, through the rails 10, the pinion gears AND and the gears 12, transmit the swinging motion to the work rolls 4. The tubular billet entering the cage (not shown in the figures) is rolled by the work rolls 4, the vertical rolling force being transmitted through the support rolls 5 and the supporting bars 2 to the stationary bed 1, and the axial forces, technological and dynamic, are transmitted through the bearings 6 or the walls of the movable casing 3, or on the covers 9. The springs 13 always press the work rolls 4 and the support rolls 5 to the support bars 2 m, thereby ensuring close contact at the place of their contact.

To replace the working 4 or supporting 5 rolls, remove the covers 9 and loosen the spring 13, and to remove one of the rolls de5A

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Only those covers are mounted that fix the supports of only this roll, without disturbing the rest of the rolls. This preserves the adjustment of the stand, on which a significant part of the total mill downtime is required for roll breaks. Due to the possibility of replacing any work or support roll in the minimum time independently of one another along the rolling axis, the handling time is significantly reduced.

Claims (2)

1. USSR author's certificate number 171830, cl. In 2IB 13/02, 1964. 2. US patent number 2062559, cl. 72-189, 1936. 12 3