RU2422225C2 - Pipe section press forming stand - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in designing and updating operated pipe section four-toll presses. Proposed stand comprises foundation with openings, cover and sliding plates. Foundation openings accommodate horizontal rolls with bearings and pads. Top roll incorporates drive screw mechanism for radial adjustment. Lateral rolls have bearings, casings and screw mechanisms of radial adjustment. Stand is provided with drives articulated with vertical roll radial adjustment screw mechanisms. Said drives are made up of twin cylindrical reduction gearboxes and conical geared motor arranged in cantilever on their output shafts. Top horizontal roll radial adjustment drive screw mechanism and lateral vertical roll radial adjustment drive screw mechanisms are provided with displacement pickups.

EFFECT: higher quality of welded pipes and stand efficiency.

3 cl, 3 dwg

Description

The invention relates to the field of metal processing by pressure, and more precisely, to pipe welding production and can be used both in the design of new and in the modernization of the working structures of four-roll stands of molding and profile-calibration mills.

In the pipe-welding industry, the need for expanding the assortment of welded pipes (expanding the range of sizes of cylindrical and profile pipes, wall thicknesses and the use of steels with higher service properties) and improving the quality of pipes in terms of improving the accuracy of geometric dimensions, improving the structure and increasing mechanical strength is increasing every year. zones of the longitudinal weld.

This is due to both an increase in pressure and the number of aggressive elements of the transported medium (oil, gas and their products) in pipelines from welded pipes, as well as properties of the environment of their placement (sea water, swamps, permafrost).

Known molding cage tube mill, see and.with. USSR No. 1098605, M.cl. B21C 37/08 claimed 06/26/81, publ. 06/23/84

The cage contains horizontal rolls installed in the frame with a radial adjustment mechanism and vertical rolls located in the housings with axial and radial adjustment mechanisms. In addition, it is equipped with axial adjustment units of horizontal rolls, each of which is made in the form of guides mounted on the frame with a movable bar placed in them and an axial adjustment mechanism associated with it.

The disadvantage of this stand is that manual radial and axial adjustment of the vertical rolls increases the handling time of the tool (rolls) when switching to a different size and reduces the accuracy of the rolls, which negatively affects the quality of production of welded pipes.

In the production of welded pipes with a diameter of 140 ÷ 630 mm, when in order to overcome the radial force acting on the vertical rolls, the moment on the screw of the radial adjustment mechanism reaches 1000 ÷ 3500 Nm, their manual adjustment is practically impossible.

Manual radial adjustment of the lower horizontal roll using gaskets reduces the accuracy of its installation and increases the time of transshipment.

Taking into account the production of pipes, which is often found in pipe welding production, in small batches, the time of transshipment of the equipment of the unit for receiving pipes of another standard size becomes relevant.

Of the known molding stands of the tube-mill, the closest in technical essence is the stand described in A.S. USSR No. 623606, M.cl. B21C 37/06, B21B 13/10, claimed September 20, 1976, publ. 09/15/78

This cage contains a frame with a cover, windows and slide bars, horizontal rolls installed in the frame windows with bearings and pillows, the top of which is equipped with a radial adjustment screw drive mechanism, a horizontal lower roll with adjusting gaskets, vertical side rolls with bearings, pillows and housings, mounted on the ends of the bed with the possibility of vertical movement and fixing with traverses and non-driven screw radial adjustment mechanism.

The main disadvantage of this design of the molding stand of the tube mill, as described above, is that it is not possible to quickly and accurately adjust the side vertical and lower horizontal rolls manually, which negatively affects the reduction of transshipment time, the accuracy of installation of the technological tool (rolls) in the stand and on the quality of welded pipes in terms of their geometric dimensions.

The same width of the sliding strips fixed to the frame windows for the horizontal roll pillows in the area of the vertical side rolls limits the possibility of their perception of technological efforts in the production of welded pipes and, as a result, sharply reduces their assortment (technological capabilities of the stand).

The objective of the present invention is to create a molding stand of a tube-shaped mill, which allows to increase the quality of welded pipes and reduce the time it takes to change a tool (rolls) during the transition to the production of another size due to the accurate and quick adjustment of horizontal and vertical rolls.

This object is achieved by the fact that the molding cage of the tube-shaped mill containing the frame with a cover, windows and slide bars located in the windows of the frame horizontal rolls with bearings and pillows, the upper of which has a drive screw radial adjustment mechanism and side vertical rolls with bearings, housings and according to the invention, screw radial adjustment mechanisms mounted on the cross beams are provided with a side kinematically connected with screw radial adjustment mechanisms O vertical rolls drives are constructed as double gears and cylindrical cantilevered placed on their output shafts bevel gear motors, the screw drive mechanism radial adjustment of the upper horizontal roll and the radial adjusting drive rollers are provided with lateral vertical displacement sensors. In addition, the pillows of the upper horizontal roll and the traverse of the side vertical rolls are equipped with brackets with axes and connecting them with ties of an adjustable length. The bed in the zone of placement of the side vertical rolls is made with thickenings, equipped with additional slats interacting with the cases of the side vertical rolls, and grooves for free vertical movement of the protrusions made on the pillows of the lower horizontal roll.

Such a constructive implementation of the molding stand of the tube mill will improve the quality of welded pipes and reduce the time it takes to change the tool (rolls) when switching to the production of another standard size.

The supply of screw mechanisms for the radial adjustment of the side vertical rolls with drives and the equipment of the drives for the radial movement of the rolls with displacement sensors make it possible to more quickly and accurately install them when switching to another standard size of the pipes to be welded.

Equipping the bed racks with local thickenings to accommodate additional sliding strips of the side vertical rolls, and also due to the mechanization of their adjustment, allows you to expand the assortment and improve the quality of the pipes being welded.

Supplying the cushion of the upper horizontal roll and the traverse of the side vertical rolls with brackets with axes and connecting screed of adjustable length allows quick adjustment of the side vertical rolls to the required gauge size in height, controlled by the displacement sensor.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

- figure 1 shows the molding stand of the tube mill;

- figure 2 is the same, a view along arrow A in figure 1;

- figure 3 is a section bB in figure 1.

The molding stand of the tube-shaped mill comprises a frame 1 with a cover 2, windows 3 and slide bars 4 located in the windows 3 of the frame lower 5 and upper 6 horizontal rolls and side 7 vertical rolls. The lower 5 horizontal roll is mounted on the shaft 8 with rolling bearings 9 located in the pillows 10. The pillows 10 below have inclined supporting planes 11 that interact with the wedges 12 of the radial adjustment mechanism 13 of the lower horizontal roll. The upper 6 horizontal roll is mounted on the shaft 14 with rolling bearings 15 and pillows 16 and interacts through elastic means 17 with the pressure screws 18 of the radial adjustment mechanism 19, which is made in the form of two worm gears 20 connected to a common drive 21. At the free end of the shaft one from worm gears 20 mounted displacement sensor 22.

Lateral vertical rolls 7 with bearings 23 and axles 24 are mounted in housings 25 with thrust bearings 26 with holes and have helical radial adjustment mechanisms with drives.

Screw radial adjustment mechanisms are made in the form of hollow screws 27, interacting with thrust bearings 26, and nuts 28, placed in traverses 29, mounted on the ends of the frame 1 with the possibility of movement and fixing.

The drives of the helical mechanisms for the radial adjustment of the lateral vertical rolls are made in the form of double cylindrical gears 30 and conical motor gears 32 located on their output shafts 31.

A displacement sensor 33 is placed on one of the output shafts of the cylindrical gearbox 30 behind the bevel motor gearbox 32. The free ends of the hollow screws 27 through the spline connection 34 interact with the gears 35 of the gears 30, each of which is engaged with gears from two diametrically opposite sides. 36.

Double helical gears 30 are rigidly connected to the housings 25 of the side vertical rolls 7 by means of studs 37 located in the hollow screws 27 and nuts 28.

Pillows 16 of the upper horizontal roll 6 and the traverse 29 of the side vertical rolls 7 are equipped with brackets 38 with axles 39 and connecting them with ties of an adjustable length 40 during transshipment.

The bed 1 in the zone of placement of the side vertical rolls 7 is made with thickenings 41 and is equipped with additional slats 42 that interact with the casings 25 of the side vertical rolls 7 and grooves 43 for free vertical movement of the protrusions 44 made on the pillows 10 of the lower 5 horizontal roll.

Setting the rolls of the molding stand is as follows.

The brackets 38 of the pillows 16 of the upper horizontal roll 6 and the traverse 29 are connected by couplers 40.

Using the pressure screws 18 of the radial adjustment mechanism 19, the vertical side rolls 7 are installed to the desired height gauge, controlled by the displacement sensor 22. After this, the ties 40 are removed and the upper horizontal roll 6 is installed using the same screw radial adjustment mechanism 19 to the required size of the caliber in height with control using the displacement sensor 22.

If necessary, which occurs after regrinding of the lower horizontal roll 5, using the wedges 12 of the radial adjustment mechanism 13, the position of the lower horizontal roll is adjusted (most often using a gauge template).

Using a gear motor 32 of the mechanism for radial adjustment of the vertical side rolls, they are installed in caliber in the horizontal plane. Control their position using the sensor 33.

The proposed molding stand of the tube-shaped mill, as compared with the known ones, will improve the quality of welded pipes and reduce the time it takes to change the technological tool (rolls) when switching to the production of pipes of a different size due to the accurate and quick adjustment of horizontal and vertical rolls.

Claims (3)

1. A molding stand of a tube-shaped mill containing a bed with a cover, windows and slide bars, horizontal rolls with bearings and pillows located in the windows of the bed, the upper of which has a drive screw radial adjustment mechanism and side vertical rolls with bearings, housings and screw radial adjustment mechanisms mounted on the traverses, characterized in that it is equipped with drives kinematically connected with screw mechanisms for radial adjustment of the side vertical rolls, made in the form of double cylindrical gears and bevel gear motors mounted cantilever on their output shafts, while the drive screw mechanism for radial adjustment of the upper horizontal roll and the radial adjustment drives of the side vertical rolls are equipped with displacement sensors. 2. The cage according to claim 1, characterized in that the pillows of the upper horizontal roll and the cross-arms of the side vertical rolls are equipped with brackets with axles and connecting braces of adjustable length. 3. The cage according to claim 1, characterized in that the bed in the zone of placement of the lateral vertical rolls is made with thickenings and is equipped with additional slide bars interacting with the housing of the vertical side rolls and grooves for free vertical movement of the protrusions made on the pillows of the lower horizontal roll.

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