RU2352410C2 - Four-high multistand rolling mill - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: rolling mill contains pedestal, stand beds, where there are located with ability of radial and axial adjustment horizontal and vertical rolls with frictionless bearing, cushions, end covers and driver of horizontal and vertical rolls, including electric motors and parallel-shaft reducer. Profiling of any closed profiles complex by sectional shape, ability of rolling hardly-deformed metals and alloys is provided ensured by increasing of deformation uniformity by section of blanks by means of that on pedestal with ability of pivot turn, parallel rolling axes, it is located supporting pole for installation of driver of horizontal and vertical rolls, drivers of horizontal rolls are located at the one side of mill axis, output shaft of vertical roll from the side of horizontal rolls driver is displaced relative to this roller, and top cushion of its vertical roll contains engaged gears, one of which is fixed on shaft of roll, and other - on output control shaft. Mills have squared shape with vertical wall, in which there are implemented rectangular grooves for placement beveled roll chock and clamping wedges.

EFFECT: enhancement of equipment manufacturing capabilities and range of manufactured products.

5 cl, 7 dwg

Description

The invention relates to the field of rolling production, and more specifically to rolling mills with multi-roll caliber. The invention can most effectively be used for the production of square and rectangular pipes from cylindrical seamless and welded. These pipes are widely used in construction, engineering, automotive and furniture industries. Due to the greater bearing capacity per unit mass compared to cylindrical ones, their use allows to obtain metal savings of up to 15%, reduce the weight of products, improve the conditions and quality of manufacturing of machines and structures.

The invention can also be used for the production of workpieces from difficult to deform metals and alloys.

Known multi-stand rolling mill, see ed. testimonial. No. 1338905, class B21B 1/14, declared 08/02/85, publ. 09/23/87

This mill contains a pedestal, removable cassettes, in which four-roll stands with cylindrical split housings, hydraulic clamping and separation mechanisms and roll rotation drives are mounted.

Each split stand has two drive rolls and two single rolls. The cages are combined into a continuous group of several stands and are equipped with two group drive rolls located on both sides of the rolling axis. The axis of the rolls of all stands are inclined at an angle to the horizontal plane. The mill has significant dimensions, metal consumption and the complexity of manufacturing due to the two-sided arrangement of group drives of stands, the presence of a massive pedestal, hydraulic system and detachable cases of stands.

The presence in each four-roll gauge of the stand of only two drive rolls does not provide sufficient study when rolling difficultly deformed metals and alloys, and when profiling pipes, it worsens their quality in terms of increasing the radius of mating and concavity of the sides, as well as the maximum deviations in external dimensions and does not allow for more thin-walled pipes.

Four-roll mills with two drive rolls in each gauge require more stands in the production of shaped tubes than mills with all drive rolls in one gauge.

Of the known closest in technical essence is a four-roll multi-stand rolling mill described in the patent of the Russian Federation No. 2180873, class. B21B 1/14, declared 03/30/99, publ. 03/27/2002

This mill contains a pedestal, stands of stands with radial and axial adjustment of horizontal and vertical rolls with rolling bearings, pillows, end caps and horizontal roll rotation drives located on one side of the stands and vertical roll rotation drives located above the stands. The roll rotation drives include an electric motor, a hollow transfer bevel gear and four spur gears. A drive roller wiring is located in the axial cylindrical cavity of the bevel transfer gearbox.

The disadvantages of the known four-roll multi-stand mill are significant dimensions in length and weight due to the presence of transfer gearboxes and driven roller wiring.

Another disadvantage of the mill is its narrow technological capabilities in the production of complex profiles and rectangular pipes, since the diameters of the rolls are rigidly linked to the parameters of the transfer and reduction gears.

Placing the rolls in a stand with detachable bodies, the presence of a cassette and the absence of special tools make it difficult and increase the duration of the transshipment of the rolls.

The objective of the present invention is to create a four-roll multi-stand rolling mill with wide technological capabilities, allowing due to more uniform deformation of the cross section of the workpieces by drive rolls and a flexible arrangement of drives of horizontal and vertical rolls, not only profiling of square, rectangular and complex cross-sectional shapes of closed profiles with different wall thickness, but also to produce rolling of hardly deformed metals and alloys in narrow t temperature zone of heating, as well as editing their longitudinal curvature.

The next objective of the invention is to reduce the time for transshipment of rolls.

The task is achieved in that a four-roll multi-stand rolling mill containing a pedestal, stand stands with radial and axial adjustments of horizontal and vertical rolls with rolling bearings, pillows, end caps and rotation drives of horizontal and vertical rolls, including electric motors and helical gears, according to the invention is equipped with a support stand located on a pedestal with the possibility of rotation around an axis parallel to the axis of rolling the installation of the vertical roll rotation drives, the horizontal roll drives are located on one side of the mill axis, the output shaft, the vertical stand roll on the horizontal roll drive side is offset relative to this roll, and the upper vertical roll pillow on the horizontal roll drive side contains gears engaged, one of which are mounted on the roll shaft, and the other on the output shaft of the drive. In addition, the stands of the stands have a rectangular shape with a vertical wall, in which rectangular grooves are made to accommodate the beveled cushion rolls and fixing wedges. The drives of horizontal and vertical rolls are made group separately for horizontal and all vertical rolls of stands, or group for each stand for horizontal and vertical rolls, or individual for each horizontal and vertical rolls. Each stand of the stand with rolls is mounted on a pedestal with the possibility of vertical and lateral adjustments. The rolls are made bandaged, while in the radial grooves of the ends of the hubs and bandages, dowels are fixed with set screws for transmitting torque and axial adjustment of the rolls, and the smallest inner bore diameter of the hubs is larger than the described diameter of the roll pads.

Such a constructive implementation of a four-roll multi-stand rolling mill will allow expanding its technological capabilities and profiling square, rectangular and complex cross-sectional shapes of closed profiles with different wall thicknesses from cylindrical seamless and welded pipes, as well as correcting their longitudinal curvature.

In addition, the proposed design of the mill can be used when rolling in a narrow temperature zone of difficultly deformed metals and alloys.

This is achieved due to the fact that in the production of complex closed profiles, when the diameters and configuration of the technological part of each of the rolls in one caliber are different and, therefore, it is necessary to have an individual drive for each roll. In this case, the output shaft of the vertical roll from the side of the drives of the horizontal rolls is offset relative to the axis of its roll due to the placement of two gear gears in its upper cushion, one of which is mounted on the roll shaft, and the other on the output shaft.

In the manufacture of rectangular and oval pipes, when the profiles are symmetrical with respect to the horizontal and vertical axes, a group pairwise drive of horizontal and vertical rolls of each stand is possible, both vertical rolls of each stand for displacement of the drive axis relative to the roll axis are equipped with cylindrical gears.

In the production of square pipes, when the configuration and diameter of the roll in one caliber are the same, group drives of horizontal and vertical rolls can be used. Placing the drives of horizontal rolls on one side of the stand, and vertical ones above the stands, the constructive implementation of the stands of the stands and the methods of fastening and adjusting the units of the rolls reduce the dimensions, metal consumption, the complexity of manufacturing and maintenance and, as a consequence, the cost of manufacturing, installation and operation.

The placement of the vertical roll drives on the support rack with the possibility of its rotation around an axis parallel to the rolling axis provides free access of the electric bridge crane to the beds with rolls during transshipment.

The implementation of the rolls using bandages and external technological parts with an inner diameter larger than the described diameter of the roll support, dramatically reduces the time of transshipment of the rolls, since when changing them, disassembly and assembly of the roll assemblies are not required.

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

figure 1 shows a four-roll multi-stand rolling mill with a group drive of horizontal and vertical rolls;

figure 2 is a view along arrow A in figure 1, when the drive group to all stands;

figure 3 - place B in figure 1;

figure 4 - rotated 90 ° section bb in figure 3;

figure 5 is a section GG in figure 3;

figure 6 - four-roll multi-stand rolling mill with an individual drive of horizontal and vertical rolls;

Fig.7 is a view along arrow A on the drive of horizontal rolls, when both horizontal rolls of each stand are driven from one engine.

The four-roll multi-stand rolling mill contains a pedestal 1, on which, using adjustable gaskets 2, the frames 3 of the four-roll stands 4 are fixed with horizontal 5 and vertical 6 rolls placed in them with the possibility of radial and axial adjustments and rotation drives of these rolls, including electric motors 7, 8 and cylindrical gearboxes 9, 10.

On the pedestal 1 with the possibility of rotation around the axis 11, parallel to the axis of rolling, a support column 12 is installed to accommodate the rotation drives of the vertical 6 rolls. Drives of rotation of horizontal 5 rolls are placed on one side of the mill. The beds 3 of the stands 4 have a rectangular shape with grooves made in the rear wall, in which beveled pillows 13, 14 with fixing wedges 15 are placed. Rolling bearings 16 are mounted in the pillows 13, 14, in which the shafts 17, 18 are installed with rollers 5 fixed to them , 6 and end caps 19. At the same time, the pillow 14 of the vertical roll 6 located on the drive side of the horizontal rolls 5 contains gears located between each other, one of which 20 is fixed to the shaft 21 of the vertical roll, the other 22 to the output shaft 23, mounted in rolling bearings 24, 25, ensuring the intersection of the shaft 23 with the output shaft 17 of the upper horizontal roll 5.

The rolls are made bandaged, while in the radial grooves of the ends of the hubs 26 and bandages 27 are fixed dowels 28 with set screws 29, and the smallest inner bore diameter of the hubs 26 is greater than the described diameter of the pillows 13, 14 of the rolls.

Each stand 4 on the service side is equipped with a threaded hole 30 that interacts with the adjusting screw 31 located in the grooves 32 of the pedestal 1.

Drives of horizontal 5 and vertical 6 rolls, including electric motors 7, 8, spur gears 9, 10 are connected to their output shafts 17, 18, 23 using spindles 33.

Drives of horizontal 5 and vertical 6 rolls can be group (figure 1, 2) separately for all horizontal and all vertical rolls of stands, or group (figure 7) for each stand for horizontal and vertical rolls, or individual (figure 6) for each horizontal and vertical rolls.

The mill works as follows.

Electric motors 7, 8 through cylindrical gears 9, 10 or spindles 33 and shafts 17, 18, 23 rotate the banding rolls 5, 6 of all stands 4. In each gauge of stand 4, profiling of the cross section of profile 34 is performed. To obtain high-quality square, rectangular and four four-roll stands are required for oval pipes; for more complex closed profiles, up to six stands are required.

If necessary, due to the mutual spatial displacement of the stands relative to each other, which is achieved by adjusting the stands in the vertical and transverse directions, the longitudinal curvature is corrected.

When rolling in a narrow temperature zone billets of hardly deformed metals and alloys in a four-roll gauge, sufficient study and compaction of the metal is ensured.

It is possible to adjust the bandages 27 on the axis of the caliber due to the set screws 29.

The smallest possible width of the mill stand along the rolling axis allows rolling blanks with a length greater than the diameter of the rolls by 5-10%.

The proposed implementation of a four-roll multi-stand rolling mill in comparison with the known ones will allow profiling of any complex cross-sectional shape closed profiles with different wall thicknesses and correcting their longitudinal curvature, as well as rolling difficultly deformed metals and alloys in a narrow temperature zone of heating.

In addition, the proposed design of the mill will reduce the time for transshipment of rolls.

Claims (5)

1. A multi-stand rolling mill with four-roll stands containing a pedestal, stands of stands with radial and axial adjustments of horizontal and vertical rolls with rolling bearings, pillows, end caps and rotation drives of horizontal and vertical rolls, including electric motors and helical gears, characterized in that the rotation drives of the vertical rolls are mounted on a support column located on a pedestal with the possibility of rotation around an axis, parallel axis of rolling, the drives of horizontal rolls are placed on one side of the axis of the mill, while the output shaft of the vertical stand roll on the drive side of the horizontal rolls is offset relative to the axis of this roll, and gears are engaged in the upper cushion of this vertical roll, one of which is fixed to the roll shaft, and the other on the output shaft of the drive. 2. The mill according to claim 1, characterized in that the stands of the stands have a rectangular shape with a vertical wall, in which rectangular grooves are made to accommodate the beveled cushions of the rolls and the fixing wedges. 3. The mill according to claims 1 and 2, characterized in that the drives of horizontal and vertical rolls are made group separately for horizontal and all vertical rolls of stands, or for horizontal and vertical rolls in each stand, or individual for each horizontal and vertical rolls. 4. The mill according to claim 1, characterized in that the bed of each stand with rolls is mounted on a pedestal with the possibility of vertical and lateral adjustments. 5. The mill according to claim 1, characterized in that the rolls are bandaged, while in the radial grooves of the ends of the hubs and bandages, dowels are fixed with set screws for transmitting torque and axial adjustment of the rolls, and the smallest inner bore diameter of the hubs is larger than the diameter of the roll pads.

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