RU2471581C1 - Quarto sheet rolling stand - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to rolling-mill machinery and may be used in sheet rolling cluster mills with control over roll space shape. Proposed stand comprises beds with bottom crossbars, support rolls with pads, bottom rolls resting via gaskets on crossbars and being provided with hydraulic cylinders of equalising top support roll. Hydraulic cylinder plungers rest on top support roll pad. It comprises working rolls with pads and hydraulic cylinders of equalising top working roll. Note here that gaskets on bottom support roll pads sides are composed of curvilinear supports. Note here that every curvilinear support is composed of rack directed across crossbar with its surface facing support roll pad and features cylindrical shape. Note that faces of hydraulic cylinder plungers feature spherical shape.

EFFECT: gap clearance adjustment range expansion and reduced stress at roll bearings.

3 cl, 3 dwg

Description

The invention relates to rolling production and can be used in the construction of multi-roll stands for rolling sheet metal with the regulation of the shape of the roll gap.

A known design of a sheet rolling mill quarto with a hydraulic pressing device, comprising beds with lower cross members, backup rolls with pillows, the lower of which are supported by their flat surfaces on the lower cross members and equipped with hydraulic cylinders for balancing the upper backup roll, whose plungers are supported by flat supporting surfaces on the pillow of the upper supporting roll, work rolls with pillows and cylinders for balancing the upper work roll, the plungers of which also have flat thrust surfaces ti [1].

The disadvantages of this stand design are that the flat supporting surfaces of the pillows of the lower support roll are in force contact with the flat lower cross member, the pillows of the upper support roll are in contact with the flat contact surfaces of the rams of the balancing hydraulic cylinders, and the balancing cylinders of the upper work roll interact with its pillows on a flat surfaces. This narrows the possibility of self-adjusting the position of the pillows of the work rolls and backup rolls by turning them in a vertical plane in the process of regulating the shape of the roll gap by the bending of the rolls, which reduces the limits of regulating the shape of the roll gap and also leads to an overload of the roller bearings.

The closest analogue to the present invention is the design of a sheet rolling mill quarto containing beds with lower crossbars, backup rolls with pillows, the lower of which are supported through gaskets on the cross and equipped with hydraulic cylinders to balance the upper backup roll, whose plungers are supported on the pillow of the upper backup roll, work rolls with pillows and hydraulic cylinders balancing the upper work roll. In this case, the ends of the plungers of the balancing hydraulic cylinders of both the working and backup rolls are made flat [2].

The disadvantages of the known design are that the pillows of the work and backup rolls are in force contact (i.e., clamped) between the flat contact surfaces and the flat ends of the rams of the balancing hydraulic cylinders, which excludes their rotation in the vertical plane when the backup and work rolls are bent. This narrows the possibilities of regulating the shape of the roll gap, and also leads to an overload of the roller bearings.

The technical problem solved by the invention is to expand the limits of regulation of the shape of the roll gap.

To solve the technical problem in the known design, the quarto sheet-rolling stand containing beds with lower crossbars, backup rolls with pillows, the lower ones of which are supported through spacers on the crossbars and equipped with hydraulic cylinders to balance the upper backup roll, whose plungers are supported on the pillow of the upper backup roll, work rolls with pillows and cylinders for balancing the upper work roll, according to the invention, gaskets on the sides facing the pillows of the lower backup roll are made in the form of curved legs, each cam support is designed as a rail oriented along the cross member, whose surface facing the cushion support roll has a cylindrical shape, and the ends of the plungers of the upper cylinders equilibration reference and working rolls are spherical.

Figure 1 presents a sheet rolling stand quarto; figure 2 is a section along aa in figure 1; figure 3 - arrangement of the pillows of the lower backup roll before and after self-installation.

The rolling stand consists of two closed-type beds 1, the closed contours of which form windows. In the windows of the frame 1 is placed the upper backup roll 2 with pillows 3 of the upper backup roll. In the openings formed by the pillow racks 3, there are pillows 4 of the upper work roll 5.

The balancing mechanism of the upper backup roll 2 is made in the form of hydraulic cylinders, the plungers 6 of which are supported on pillows 3, and the housings are installed in the pillows 7 of the lower backup roll 8, the axis of which is a straight line A ₀ -B ₀ in statics (FIG. 2, FIG. 3 )

Pillows 7 of the lower support roll 8 are supported on curved supports in the form of rails 9 oriented along the lower cross members 10 of the frame 1.

In the openings formed by the pillow racks 7 of the lower support roll 8, the pillows 11 of the lower work roll 12 are located. In the pillows 11 of the lower work roll 12, the balancing cylinders of the upper work roll 5 are placed, the plungers of which 13 are supported on the pillows 4 of the upper work roll. The ends of the plungers 6 and 13 of the hydraulic cylinders have a spherical shape.

In the upper cross members of both beds 1 there is a pressure mechanism in the form of a pair of hydraulic cylinders, the plungers 14 of which are spherical in shape.

The device operates as follows. In the cavity of the balancing hydraulic cylinders, oil is supplied under pressure. Under the influence of oil pressure, the plungers 6 extend and raise the upper backup roll 2 with pillows 3 inside the frame 1 until the pillows 3 rest in the plungers 14 of the hydraulic cylinders of the pressure mechanisms. Also, under the influence of oil pressure, the plungers 13 raise the upper work roll 5 with pillows 4, pressing the work roll 5 to the upper backup roll 2.

The upper work roll 5 and the lower work roll 12 are driven by electric motors.

Oil is supplied under pressure to the hydraulic cylinders of the pressure device, the plungers 14 of which are extended, thereby setting the required clearance between the work rolls 5 and 12. The strip to be rolled is set into the cage and it is crimped between the work rolls 5 and 12. The rolling force from the work rolls 5 and 12 transferred to the supporting rolls 2 and 8 adjacent to them, to the pillows of the supporting rolls 3 and 7 and locked to the frame 1 through the pressure mechanism, rails 9 and cross-pieces 10.

When boxing (flatness violation) occurs, the stripes change the shape of the roll gap. To do this, increase the pressure in the balancing cylinders of the upper backup roll and push up the plungers 6, which burst pillows 3 and 7 of the backup rolls.

Both pillows 7 of the lower support roll 8 are rotated in opposite directions relative to the curved surface of the rails 9 and occupy the position shown for the right pillow 7 in figure 3 by a dashed line.

This leads to a bending of the backup roll 8, the axis A ₀ B _{0 of} which occupies a curved shape A ₁ B ₁ , which is accompanied by a change in the shape of the roll gap, a decrease in compression in the middle of the strip and the disappearance of warping. The self-alignment of the pillows 7 in a new position reduces the load on the bearings, as the axis of the bearings and the backup roll 8 after self-align. Since the rails 9 are in contact with the lower surfaces of the pillows 7 along their entire length, this reduces contact loads, deformation of the rails 9 and pillows 7, which increases their resistance.

Since the ends of the plungers 6 and 15 are spherical in shape, when adjusting the roll gap, the clamping of pillows 4, 11 of the work rolls and pillows 3, 7 of the backup rolls between flat surfaces is excluded, as is the case in an analog device [2]. They rotate freely relative to the spherical ends of the plungers 6 and 13, which expands the limits of regulation of the shape of the roll gap and reduces the load on the bearing bearings of the rolls.

Technical appraisal and economic advantages - laying on the sides facing the pillows of the lower backup roll in the form of curved supports, when each curved support is made in the form of a rail oriented along the cross member, the surface of which facing the pillow of the backup roll has a cylindrical shape, clamping is excluded pillows of the backup roll between flat surfaces, provides the freedom of their self-installation in a new position during hydraulic expansion. Due to this, the expansion of the limits for regulating the shape of the roll gap is achieved, and the load on the bearing bearings of the rolls is reduced. Performing a curved support in the form of a rail reduces contact loads, increases the stability of the position of the pillows of the lower backup roll, and increases the operational life of the equipment. The execution of the ends of the plungers of the cylinders for balancing the support and working rolls of a spherical shape also increases the possibility of self-setting the position of the roll pads in the process of regulating the shape of the roll gap.

As a base object adopted sheet rolling stand [2]. The use of the stand of the proposed design ensures the production of sheet metal with increased flatness, which increases the profitability of sheet production by an average of 5-7%.

Information sources

1. Patent of the Russian Federation No. 2307715, IPC B21B 31/32, 2006;

2. Korolev A.L. Mechanical equipment of non-ferrous metallurgy plants: Textbook for universities. In 3 parts. Part 3. M.: Metallurgy, 1989.S. 151, 152, 163.

Claims (3)

1. A quarto sheet rolling stand containing beds with lower cross members, backup rolls with pillows, the lower of which are supported through spacers on the cross members and equipped with balancing cylinders of the upper backup roll, whose plungers are supported on the pillow of the upper backup roll, and work rolls with pillows and balancing cylinders upper work roll, characterized in that the gaskets on the sides facing the pillows of the lower backup roll are made in the form of curved supports. 2. Sheet rolling stand according to claim 1, characterized in that each curvilinear support is made in the form of a rail oriented along the cross member, the surface of which, facing the pillow of the backup roll, has a cylindrical shape. 3. Sheet rolling stand according to claim 1, characterized in that the ends of the plungers of the balancing cylinders of the upper support and work rolls are spherical.

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