RU2403106C2 - Multiple-stand lengthwise rolling mill - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Proposed mill comprises foundation plate to support three-roll stands with rolls with their axes arranged around the circumference at 120° to each other, upper drive secured on the frame at the angle to vertical line and two rolls lateral drives. The C-shape frame supporting upper drive is rigidly attached to foundation plate. Said frame and said foundation plate are furnished with vertical and horizontal guides in contact with rolling stands. Upper drive is inclined at 0-20° to vertical line.

EFFECT: higher stiffness of mill structure, reduced crosswise sizes.

4 dwg

Description

The invention relates to the field of rolling production, and more specifically to multicell mills with three-roll stands for longitudinal rolling, used in the production of varieties and pipes.

Multi-stand longitudinal rolling mills with three-roll working stands have wide technological capabilities and are used as calibration, reduction, continuous and other mills in the production of long products and pipes. These mills significantly differ from each other in terms of energy and power parameters, drive power and their physical dimensions.

Known multi-roll rolling mill containing a support on which are mounted three-roll stands with individual drive rotation of the work rolls, the axes of which are located circumferentially at an angle of 120 ° to each other (US Pat. US No. 3316746, CL 72-238, decl. 11.29.1963 publ. 05/02/1967). Three-roll stands are installed removably or freely on the support in such a way that they can be removed individually, but without removing the support itself. The top drive is located vertically above the rolling stand and when changing the stand is completely removed. The drive of the other two rolls is mounted obliquely on frames mounted in pits on both sides of the rolling axis.

The disadvantage of this multi-stand mill is the need to completely remove the top drive of the roll when replacing the stands, which increases equipment downtime. Used support for stands in combination with a removable upper part does not provide the necessary rigidity of the stand.

Also known is a multi-stand rolling mill containing supports on which three-roll stands are mounted with an individual drive for rotating the rolls located at an angle of 120 ° to each other (US Pat. No. 3494166, CL 72-239, decl. 01.20.1967, publ. 10.02 .1970). The axis of the drive shaft of the drive of one roll lies in a vertical plane and the drive is mounted on a frame mounted on a stationary support, on which the drive of the second roll is also mounted at an angle. The drive of the third roll is placed on an articulated frame provided with a support for the rolling stand. The cages are easily replaced and installed by turning the hinge frame. This allows you to change not only individual stands, but all at the same time.

The disadvantage of this mill is its low rigidity, caused by the presence of additional articulated joints of the rotary frame with the stationary part and, as a result, the rapid wear of the mating parts of the mill, their frequent replacement and increased unproductive downtime for equipment repair.

Another disadvantage of this mill is its significant transverse dimensions, in particular, a large depth of equipment in the foundation, which complicates the maintenance and repair of equipment, increases downtime for these works and increases the cost of building the mill.

In a multi-stand rolling mill containing a support on which three-roll stands are mounted with an individual drive for rotating the rolls, the axes of which are located at an angle of 120 ° to each other, the axis of the drive shaft of one roll is located vertically above the rolling axis, and two other drive rolls are inclined on the frames mounted in pits on both sides of the rolling axis (WO 97/19767, B21B 17/04, decl. 10.10.1996, publ. 05.06.1997). The stands of the stands are tilted and, since the stands are rotated at an angle relative to each other, they are respectively removed on both sides of the rolling axis. The rolling axis is located at a considerable distance from the floor level.

The disadvantage of this multi-stand mill is also the lack of rigidity of the stand and the large dimensions of the mill both in height and in width with all the above consequences.

The closest in technical essence is a multicell rolling mill containing a base plate for three-roll working stands with rolls, the axes of which are arranged circumferentially at an angle of 120 ° to each other, the upper and two side drives for rotating the rolls (US Pat. No. 2002/0020205A1, 72 -224, declared March 28, 2001, published February 21, 2002). The axis of the drive roller of the drive rotation of one roll is horizontal and, therefore, the axis of the drive shaft of the upper drive rotation of the work roll is offset from the vertical by an angle of 30 °. The top drive is mounted on a frame mounted on a concrete support column with the possibility of changing its position along the axis or turning about the axis. The third drive is placed in the pit on one side of the rolling axis. The cages are located on a support with the possibility of their movement in the horizontal direction. Composite drive shafts allow stands to be replaced without removing the drive.

A disadvantage of the known design of a multi-cage rolling mill is that it has low rigidity caused by the movable fastening of all three drives of the mill to ensure the spindles are disconnected from the shafts of the working stands and, as a result, the presence of additional gaps in the places of mounting of the drives, and this leads to significant conditions loads, as well as the presence of scale, to the rapid wear of the mill parts and additional unproductive downtime of equipment associated with the repair. The upper roll rotation drive, inclined 30 ° to the vertical, hangs over the drive buried in the foundation of the mill, which greatly complicates the operation of replacing worn-out equipment of the lower drive and, accordingly, increases the mill downtime. In addition, the mill has significant transverse dimensions, especially the deepening of the lower drive into the foundation of the mill. In addition to the cost of building the mill, this drawback complicates the conditions of service, increases unproductive downtime of equipment associated with the repair and replacement of worn parts and mechanisms.

The objective of the present invention is to create a multicell longitudinal rolling mill having minimal lateral dimensions, improved conditions for maintenance and repair of equipment while maintaining high rigidity of the mill.

The problem is achieved in that in a multi-cantle longitudinal rolling mill containing a base plate, three-roll working stands with rolls placed on it, whose axes are arranged circumferentially at an angle of 120 ° to each other, are mounted on the frame at an angle to the vertical from the top drive and two side drives the roll rotation drive according to the invention, the upper drive bearing frame is C-shaped and rigidly fixed to the base plate, the C-shaped frame and base plate are provided with vertical and horizontal guides in contact with rolling mill stands, the top drive is inclined to the vertical at an angle of 0-20 °.

Such a constructive implementation of a multi-stand longitudinal rolling mill will provide minimum transverse dimensions, in particular, reduce the deepening of the drives in the foundation; will improve the conditions of maintenance and repair of equipment; reduce unproductive equipment downtime; will increase the rigidity of the mill structure and, as a result, the durability of parts and mechanisms; will provide easy transshipment of stands as all at once, and selectively one or more stands at a time.

The angle of inclination to the vertical of the upper drive is determined depending on the power of the drives of the multi-bench mill and tentatively selected:

- closer to 0 ° for calibration mills;

- closer to 20 ° for crimping long and continuous pipe mills;

- the intermediate value of the angle of inclination is used for reduction mills.

This is due to the difference in the physical dimensions of the drives of a multi-stand longitudinal rolling mill with three-roll stands. It has been established that the angle of inclination of the upper drive 0-20 ° to the vertical for each type of mill is optimal to ensure minimum lateral dimensions and depths, while due to the rigid fastening of the C-shaped frame on the base plate, high rigidity of the mill is ensured. The horizontal and vertical guides of the base plate and the C-shaped frame provide reliable fixation of each stand, increasing their rigidity.

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 multi-stand mill for longitudinal rolling, for example six-stand, a General view in plan;

figure 2 is the same, view a in figure 1 (calibration rolling mill) at an angle β≈0 °;

figure 3 is the same, view a in figure 1 (continuous rolling mill) at an angle β≈20 °;

figure 4 is a section bB in figure 2, 3 (on an enlarged scale).

A multi-stand longitudinal rolling mill consists of a support plate 1, for example, six three-roll working stands 2 with rolls 3, the axes of which are arranged circumferentially at an angle of 120 ° to each other, mounted at an angle to the vertical of the upper drive 4 and two side 5 and 6 roll rotation drives 3.

The top drive 4 is mounted on a C-shaped frame 7 at an angle β≈0-20 ° to the vertical. Side drives 5 and 6 are mounted on the respective struts 8. All drives 4, 5, 6, including electric motors 9 and gear stands 10, transmit rotation to the rolls 3 of the working stands 2 by means of spindles 11, which are disconnected from the stands 2 by means of trip units 12, with this spindles 11 are held by supporting devices 13.

The C-shaped frame is rigidly fixed to the base plate 1. The base plate 1 and the C-shaped frame 7 are provided with vertical 14 and horizontal 15 guides in contact with the working stands 2, which are installed with the possibility of horizontal movement when replacing them (transshipment). For fastening the working stands 2 during operation, locking mechanisms 16 are provided.

For transshipment of stands 2 perpendicular to the axis of the mill, guide rails 17 are installed along which the stands are moved by a transport trolley 18.

The angle β of the inclination of the top drive 4 to the vertical depends on the drive power, determined by the purpose of the mill.

Figure 2 shows a calibration mill with an angle of inclination β close to 0 °, in which the overhang of the top drive 4 (value "L") does not interfere with the maintenance and replacement of worn parts and mechanisms of the right side drive 5. The dimensions of the mill and the depth of the side drives 5 and 6 are optimal for this type of mill, since the calibration mill has a small power of electric motors 9 and small sizes of gear stands 10.

However, this scheme (β≈0 °) is unacceptable when using more powerful drives in reduction and continuous mills, since the increased dimensions of the drives will require an increase in its transverse dimensions and a deepening of the foundation for side drives 5 and 6.

Figure 3 shows a continuous mill, in which the top drive is inclined to the vertical by an angle close to 20 °. In this case, the overhang “L” is close to critical, but the conditions for servicing and repairing the equipment remain favorable with minimal transverse dimensions of the mill and insignificant depths of the foundation of the mill.

With a further increase in the angle β≥20 °, the service and repair conditions begin to deteriorate due to the increase in the overhang "L" and a significant deepening of the right side drive 5 of the rotation of the rolls 3.

The mill works as follows.

When rolling the working stands 2 are fixed by means of locking mechanisms 16 in the guides 15 and 14. The rotation of the rolls 3 during rolling is carried out from the drives 4, 5, 6.

When transshipment by disconnecting devices 12, the spindles 11 are diverted from the working stands 2 with their support by the devices 13. The locking mechanisms 16 are removed from the working stands 2, after which they are moved sideways from the vertical axis of the mill with the help of a transport trolley 18. Then the working stands 2 from the mill are removed in any known manner.

The proposed multi-strand longitudinal rolling mill, in comparison with the known ones, has higher rigidity, reduced transverse dimensions and deepening in the foundation.

Claims (1)

A multi-stand longitudinal rolling mill comprising a base plate, three-roll working stands with rolls placed on it, whose axes are arranged circumferentially at an angle of 120 ° to each other, mounted on the frame at an angle to the vertical from the top drive and two side drives for rotating the rolls, characterized in that the supporting upper drive frame is made C-shaped and rigidly fixed to the base plate, the C-shaped frame and base plate are provided with vertical and horizontal guides in contact with the working stands, while the upper drive tilted up to an angle of up to 20 °.

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