RU2584099C1 - Built-in device for bending and balancing rollers for rolling mill stands - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to rolling. Apparatus comprises a bending device (8) in form of at least one of upper bending cylinder (9) with bending piston (11) adapted to interact with cushion (3) of upper working roll (2) and at least one lower bending cylinder (9') with bending piston (11') configured to interact with cushion (3') of lower working roll (2'), and attached to bending device (8) balancing device (12) in form of at least one cylinder (13) with balancing piston (14) configured to interact with cushion (5) of upper support roll (4). Reduction of dimensions and improving reliability of device is ensured due to that it has an upper movable slide (15) mounted to allow sliding at one end of balancing device (12), and a lower movable slide (15') mounted to allow sliding on other end of balancing device (12), wherein bending piston (11) of at least one of upper bending cylinder (9) is fixedly connected to upper movable slide (15) with possibility of movement of cushion (3) of upper working roll (2) via upper movable slide (15) and bending piston (11') of at least one lower bending cylinder (9') is fixedly connected to lower movable slide (15') with possibility of movement of cushion (3') of lower working roll (2') through lower movable slide (15').

EFFECT: rolling.

15 cl, 10 dwg

Description

FIELD OF THE INVENTION

The present invention relates to an integrated system for bending and balancing rolls for stands of a rolling mill intended for sheet rolling, in particular suitable for bending (bending) work rolls or rolls and for balancing the upper backup rolls in a stand of a rolling mill equipped with a shear device for axial shear of work rolls under load.

State of the art

Bending devices for bending (bending) work rolls and balancing devices for balancing the upper backup rolls used in stands of a rolling mill for sheet products, for example strips or sheets, are known in the art. These bending devices are designed to bend the work roll using hydraulic pistons in such a way as to compensate for deformation caused by the rotation force, or to give a predetermined deformed shape to the work rolls.

It is also known from the prior art to use a shear device for axial shear of work rolls, which allows, on the one hand, to evenly distribute the wear of work rolls, which usually occurs at the edges of the rolling strip with lower temperature during long-term production of products of the same width, and, on the other hand, control the thickness of the products at the exit compared to the use of non-cylindrical rolls.

One of the systems known from the prior art requires fixing the bending device on the housing of the mill stand. The action of the upper and lower hydraulic bending pistons of the rolls is directed directly to the protrusion of the corresponding pillows of the upper or lower work roll. The hydraulic cylinder is designed to shift the work roll, which is shifted along the axis of the corresponding cushion and the corresponding work roll due to the movable support directed into the frame attached to the frame of the mill stand.

From the documents US 4907439, US 4934166, US 4967582 and US 7895871 known mill stands equipped with bending devices and shear devices. In all known solutions, the balancing devices of the upper backup roll are separated and located at some distance from the bending device, while they have one or more pistons with or without levers, the action of which is directed to the traverse of the pillows of the upper backup roll. This system works, but has certain limitations associated with large dimensions and high cost.

In yet another document JP 62009708 A, a mill stand is described in which a balancing device is attached to a bending device.

Another problem of the known systems is that during the axial shift of the work rolls, there are opposing forces directed along the axis in the direction of shear and associated with friction, which necessarily occurs between the bending pistons and the pillows of the work rolls; these forces acting on the bending pistons can damage them, especially when they are in the extended position. Similarly, damage to the seal systems (gaskets and guide rings) of bending cylinders can occur.

Obviously, there is a need to create an integrated bending and balancing system for stands of the rolling mill, which will eliminate these drawbacks, and will also ensure axial displacement of at least one of the work rolls under load.

Disclosure of invention

The main objective of the present invention is to provide an integrated device for bending (bending) and balancing rolls for stands of a rolling mill, which is generally more compact and economical compared to existing systems.

An additional objective of the invention is the creation of a system of bending and balancing rolls containing four built-in devices that are installed in the cage of the rolling mill and protect the pistons of the cylinders of the bending rolls from the action of longitudinal forces arising from friction due to the shift of the work rolls, which also allows the use of the system in stands of the rolling mill with a large gap between the two work rolls, and provide axial shift under the action of the load.

The present invention is aimed at achieving these goals by installing an integrated device for bending and balancing, made with the possibility of bending the work rolls and balancing the upper backup roll of the mill stand after installing the device in the mill stand, while this device contains:

- a bending device having at least one upper bending cylinder, configured to interact with a cushion of the upper work roll, and at least one lower bending cylinder, configured to interact with a cushion of the lower work roll,

- a balancing device having at least one balancing cylinder, configured to interact with the cushion of the upper backup roll, this balancing device is attached to the bending device,

moreover, the bending piston of at least one upper bending cylinder is inseparably connected to the upper movable slider sliding on the first end of the balancing device, whereby the bending piston can advance the cushion of the upper work roll using the upper movable slider, and the bending piston of at least one lower cylinder the bend is inseparably connected to the lower movable slider sliding on the second end of the balancing device, whereby the bend piston can advance the cushion of the lower work roll using lower movable slider.

In a preferred embodiment, the balancing device is directly attached to the bending device.

Also, in accordance with the invention, an integrated bending and balancing system for bending and balancing rolls of a mill stand is provided and comprising four built-in bending and balancing devices described above, arranged to be arranged in pairs at respective ends of the work rolls of the mill stand.

Also, in accordance with the invention, a rolling mill cage is disclosed which comprises an upper backup roll, an upper work roll, a lower work roll, and a lower support roll, and in which a bending and balancing system is installed, as described above, with four built-in devices arranged in pairs at their respective ends work rolls.

The present invention has several advantages over standard systems known in the art, in particular:

- the claimed integrated system, the dimensions of which slightly exceed the dimensions of standard bending devices, allows you to install in one device and a balancing device of the upper backup roll, and a device for bending work rolls, and the specified stand of the rolling mill allows you to perform a shift during rolling, due to the presence of devices for axial shift at least one of the work rolls configured to interact with the built-in bending and balancing devices that are installed in the rolling mill stand on;

- the tangential force resulting from friction between the pillows of the work rolls and the corresponding movable support of the bending devices during the axial shift of the work roll is weakened by the use of a movable support on the balancing device of the upper backup roll, * and, accordingly, this force does not act on the bend pistons to avoid damage to these pistons or stuffing box systems;

- the strength of the embedded system allows the axial shift of the work rolls during rolling without bending the bending pistons;

- the new system allows to reduce the cost and dimensions of a separate balancing device of the upper backup roll due to its integration into the corresponding bending device;

- the new system can also be used for stands of a rolling mill with a large gap between the upper work roll and the lower work roll, since under no circumstances loads on the bending pistons of the work rolls will be affected whose direction does not coincide with the directions of their axes.

Preferred embodiments of the invention are described in the dependent claims.

Brief Description of the Drawings

Additional features and advantages of the present invention will become apparent after reading a detailed description of a preferred, but not exclusive, embodiment of an integrated bending and balancing system for a mill stand according to the present invention, which is presented as a non-limiting example with reference to the accompanying drawings, in which :

in FIG. 1 shows a section through a mill stand containing systems according to the present invention, on which the opening position of the work rolls is shown on the left side, and the partially worn work rolls are closed, on the right side;

in FIG. 2 shows a section of the mill stand of FIG. 1 along the H-H line;

in FIG. 3 is a side view of an embedded system of the present invention;

in FIG. 4 shows a section through the system of FIG. 3 along line A-A;

in FIG. 5 shows a section through the system of FIG. 3 along line B-B;

in FIG. 6 shows a section through the system of FIG. 3 along the line E-E;

in FIG. 7 shows a section through the system of FIG. 3 along the line C-C;

in FIG. 8 shows a section through the system of FIG. 3 along the line D-D;

in FIG. 9 shows a section through the system of FIG. 3 along the line F-F;

in FIG. 10 shows a perspective view of a mill stand, which comprises a system in accordance with the invention.

The same reference numerals in the figures denote the same elements or components.

The implementation of the invention

The figures show a preferred embodiment of an integrated system for bending work rolls and balancing the upper backup roll in a mill stand, which is capable of axial displacement of at least one of the work rolls under load.

The cage of the strip rolling mill shown in FIG. 10, reference numeral 1, contains:

- upper work roll 2;

- two pillows 3 of the upper work roll 2, one of which is located on the drive side, and the other on the operator's side;

- lower work roll 2 ′;

- two pillows 3 ′ of the lower work roll 2 ′, one of which is located on the drive side, and the other on the operator side;

- upper backup roll 4;

- two pillows 5 of the upper backup roll 4, one of which is located on the drive side, and the other on the operator's side;

- lower backup roll 4 ′;

- two pillows 5 ′ of the lower backup roll 4 ′, one of which is located on the drive side and the other on the operator side.

Work rolls 2, 2 ′ and backup rolls 4, 4 ′ are located inside the bed, which limits the opening or the inner space of the stand of the rolling mill.

In accordance with the invention, in a preferred embodiment, the rolling mill cage is equipped with drive devices for driving work rolls 2, 2 ′, configured to transmit at least one translational movement along the corresponding longitudinal axis X to at least one of work rolls 2, 2 ′.

By way of example, such drive devices comprise four shift devices 7, 7 ′ having a corresponding hydraulic cylinder 27. However, other types of drive devices can be used.

The first two shear devices 7 interact with the upper work roll 2, and the two shear devices 7 ′ interact with the lower work roll 2 ′ (see FIG. 10).

In particular, in FIG. 2 shows two shear devices 7 of the upper work roll 2. Each shear device 7 comprises a main frame 26 attached to the stand 6 of the stand of the rolling mill stand. The axial shift of the upper work roll 2 is performed by shift cylinders 27, which move the pillows 3 of the upper work roll due to interaction with the corresponding movable shift block 28. Pillows 3 are inseparably connected to the corresponding movable shear block 28 by means of a fixing bracket 29, which, if it is necessary to replace the rolls, can be opened, freeing the pillow, and therefore the work roll.

Similarly, the shift of the lower work roll 2 ′ is performed by the shift devices 7 ′ similar to the shift devices 7 described above.

An alternative (not shown) may include only one shear device for the upper work roll 2 and only one shear device for the lower work roll 2 ′.

Before continuing to shift along the axis, the work rolls 2, 2 ′ open, that is, the work rolls are moved a certain distance from each other, which is sufficient to provide axial shift of at least one of the work rolls, which avoids the mutual influence of the work roll components, for example , an annular protrusion of the work roll and the lining of another work roll.

Such shear devices allow, on the one hand, to distribute the wear of work rolls, which usually occurs at the edges of the rolling strip with a lower temperature during long-term production of products of the same width, and, on the other hand, more precisely control the thickness of the products at the exit compared to using rolls with a profile special form.

In a preferred embodiment, the mill stand comprises a bending and balancing system with four built-in bending and balancing devices 10 according to the present invention.

In a preferred embodiment, each bending and balancing device 10 is located at a corresponding stand 6 of the stand of the rolling mill stand.

Each integrated bending and balancing device according to the invention comprises:

- a bending device 8 with two upper bending cylinders 9, configured to interact with the cushion 3 of the upper work roll 2 using the corresponding pistons 11, and two lower bending cylinders 9 ′, configured to interact with the cushion 3 ′ of the lower work roll 2 ′ s using the respective pistons 11 ′, and

- balancing device 12 with at least one balancing cylinder 13, configured to interact with the pillow 5 of the upper backup roll 4 using the corresponding piston 14.

In a preferred embodiment, the bending device 8 is inseparably connected to the corresponding balancing device 12, for example, by means of screws 20 or other suitable fixing means, thereby reducing the overall size of the system. The balancing device 12 is attached to the corresponding stand 6 of the stand of the mill stand, for example, by means of screws 19 or other suitable fastening means.

The first pair of cylinders, including the upper bend cylinder 9 and the lower bend cylinder 9 ′, and the second pair of cylinders, including the other upper bend cylinder 9 and the other lower bend cylinder 9 ′, are located symmetrically with respect to the median plane of the balancing device 12, which also divides the balancing cylinder 13 into two halves.

The upper bend cylinders 9 are located opposite the corresponding lower bend cylinders 9 ′.

An additional advantage is that the balancing piston 14 of the cylinder 13 is made with the possibility of direct interaction with the pillow 5 of the upper backup roll 4, which eliminates the need for intermediate levers interacting with the traverse of the pillows of the upper backup roll.

The balancing pistons 14 are mounted on the balancing devices 12 and act directly on the pillows 5 of the upper back-up roll, which makes it possible to balance the weight of the pillows 5 themselves and the weight of the top back-up roll 4.

In addition, the new device provides a permanent connection of the pistons 11 of the upper bend cylinders 9 with the upper movable slider or support 15, sliding on the first end of the balancing device 12. Similarly, the pistons 11 ′ of the lower bending cylinders 9 ′ are inseparably connected to the lower movable slide or support 15 ′ sliding on the second end of the balancing device 12. This configuration makes it possible to protect the pistons of the bending cylinders from the longitudinal forces arising from friction during the movement of the work rolls, which makes it possible to use the system for stands of a rolling mill with a large gap between the two work rolls and to perform axial shift under load.

In the embodiment shown in the figures, the piston 11 is inseparably connected to the upper movable slider 15 by means of a screw 18 or other suitable fastening means and enables the forward movement to be transmitted to said slider 15. Similarly, the piston 11 ′ is inseparably connected to the lower movable slider 15 ′ by means of screws 18 ′ or other suitable locking means and provides movement transmission to the slider 15 ′.

Thus, the upper pistons 11 mounted on the bending devices 8 advance the pillows 3 of the upper work roll using the upper movable slide 15, thereby bending the upper work roll 2; and the lower pistons 11 ′ mounted on the bending devices 8 advance the cushions 3 ′ of the lower work roll using the lower movable slide 15 ′, thereby bending the lower work roll 2 ′.

Moreover, since the movable sliders 15, 15 ′ have at least one surface directed towards the balancing device 12 with a profile substantially coinciding and located adjacent to the profile of the ends of the balancing device 12, this embodiment ensures that friction between the protrusions 30, 30 ′ pillows 3, 3 ′ of work rolls 2, 2 ′ and the upper movable slider 15 or the lower movable slider 15 ′ creates a force tangential to the upper movable slider 15 or the lower movable slider 15 ′, which is completely weakened by by means of a movable slider on the balancing device 12, and not on the pistons 11 or 11 ′ of the bending cylinders, when the upper work roll 2 or lower work roll 2 ′ is translationally moved under the action of the shear devices along their longitudinal axis.

This preferred technical effect becomes more effective when using the upper movable support 15 and the lower movable support 15 ′ with a C-shaped cross section along the horizontal plane so that a segment of the first end and a segment of the second end of the balancing device 12 can be installed in the respective cavities.

In FIG. 9, the upper movable slider 15 has five surfaces 21, 22, 23, 24, 25 directed towards the balancing device 12, which form a profile that is almost identical and located next to the profile of the corresponding surfaces of the first end of the balancing device 12. Surfaces 22, 23 and 24 define the boundaries of the C-shaped cavity into which the segment of the balancing device 12 is inserted through which the balancing cylinder 13 passes. On the edges of the surfaces 21, 22, 23, 24 and 25, grooves filled with grease pass to reduce wear when sliding the movable slide 15 on the balancing device 12. This description also applies to the lower movable slider 15 ′ with the difference that the balancing cylinder does not pass through the segment of the balancing device 12 on which the slider 15 ′ slides, since it is not provided for the lower backup roll 4 ′.

Another advantage of the present invention is the presence in each built-in device 10 of a protective plate 16 attached to the upper movable slider 15 and located between the cushion 3 of the upper work roll and the bending device 8, and this plate has dimensions that prevent the accumulation of water and scale deposits between the upper movable the slider 15 and the bending device 8 when using the stands of the hot rolling mill, when the piston 11 is at least partially outside the cylinder pa 9 bend. The protective plate 16 can be made either integrally with the slider 15, or can be attached to the body of the device 8 of the bend, and not to the movable slider 15, or can be made as a whole with the device 8 of the bend.

If the specified plate 16 is a separate element attached to the body of the device 8 of the bend or to the movable slider 15, then the plate 16 can be removed when conditions arise for the accumulation of water and deposition of scale on the device to prevent impact on the efficiency of the device.

Another same protective plate 17 can be installed between the cushion 3 ′ of the lower work roll and the bending device 8 and be sized to prevent accumulation of water and scale deposits between the lower movable slider 15 ′ and the bending device 8 when using the stand of a hot rolling mill rolling when the piston 11 ′ is at least partially outside the bending chamber of the cylinder 9 ′.

The described components and features of various embodiments of the invention can be combined without departing from the essence of the invention.

Claims (15)

1. A device (10) for bending and balancing rolls of a rolling mill integrated in the cage of a rolling mill and comprising a bending device (8) in the form of at least one upper bending cylinder (9) with a piston (11) configured to interact with a cushion (3) the upper work roll (2), and at least one lower bend cylinder (9 ′) with a bend piston (11 ′) adapted to interact with the cushion (3 ′) of the lower work roll (2 ′), and attached to the bending device (8), the balancing device (12) in the form of at least balancing cylinder (13) with a piston (14), made with the possibility of interaction with the pillow (5) of the upper backup roll (4), characterized in that it has an upper movable slider (15) mounted for sliding on one end of the device ( 12) balancing, and the lower movable slider (15 ′) mounted for sliding on the other end of the balancing device (12), while the bending piston (11) of at least one upper bending cylinder (9) is inseparably connected with the upper movable slider ( 15) with the possibility of moving cushion (3) of the upper work roll (2) by means of the upper movable slider (15), and the bend piston (11 ′) of the at least one lower cylinder (9 ′) of the bend is inseparably connected to the lower movable slider (15 ′), with the possibility of moving the cushion (3 ′) of the lower work roll (2 ′) by means of the lower movable slide (15 ′). 2. The device according to claim 1, in which the upper movable slider (15) and the lower movable slider (15 ′) have at least one surface on the side of the balancing device (12) adjacent to the first and second ends of the balancing device (12), the profile of which coincides with the profile of the indicated first and second ends of the balancing device (12). 3. The device according to claim 2, in which the upper movable slider (15) and the lower movable slider (15 ′) have a C-shaped cross section in the horizontal plane, forming the corresponding cavity for installing in them a segment of the first end and a segment of the second end of the device ( 12) balancing. 4. The device according to claim 2, in which each bending piston (11, 11 ′) is inseparably connected to the corresponding movable slider (15, 15 ′) using fastening means (18, 18 ′), for transmitting the shear movement to the movable slider. 5. The device according to claim 1 or 2, which has a protective plate (16, 17) located between the cushion (3, 3 ′) of at least one work roll (2, 2 ′) and the bending device (8), this the plate is dimensioned to prevent accumulation of water and scale deposits between the movable slide (15, 15 ′) and the bending device (8). 6. The device according to claim 1, which contains two upper bending cylinders (9) and two lower bending cylinders (9 ′). 7. The device according to claim 6, in which the first pair of cylinders consisting of an upper bend cylinder (9) and a lower bend cylinder (9 ′), and a second pair of cylinders consisting of another upper bend cylinder (9) and another lower cylinder ( 9 ′) of bending, are located symmetrically relative to the median plane of the balancing device (12). 8. A system for bending and balancing rolls of a mill stand, comprising four bending and balancing devices (10) according to claim 1, which are integrated in the mill stand with pairs arranged at the respective ends of the work rolls (2, 2 ′) of the mill stand. 9. The system according to claim 8, containing axial shear devices designed to shear at least one of the work rolls (2, 2 ′) along the corresponding longitudinal axis and configured to interact with the built-in bending and balancing devices (10). 10. A cage of a rolling mill comprising an upper support roll (4), an upper work roll (2), a lower work roll (2 ′), a lower support roll (4 ′) and a bending and balancing system according to claim 8, four built-in devices ( 10) which are located in pairs at the respective ends of the work rolls (2, 2 ′). 11. The cage of the rolling mill according to claim 10, having built-in devices (10), in each of which the balancing device (12) is configured to directly interact with the balancing piston (14) of the balancing cylinder (13) with the corresponding cushion (5) of the upper backup roll (four). 12. The cage of the rolling mill according to claim 10, in which the work rolls (2, 2 ′) and backup rolls (4, 4 ′) are located in the bed, and each built-in device (10) has a corresponding balancing device (12) attached to specified frame. 13. The cage of the rolling mill according to claim 11, in which the work rolls (2, 2 ′) and backup rolls (4, 4 ′) are located in the bed, and each built-in device (10) has a corresponding balancing device (12) attached to specified frame. 14. The cage of the rolling mill according to claim 12 or 13, in which each built-in device (10) is located on the corresponding rack (6) of the bed. 15. The cage of a rolling mill according to claim 10, which comprises axial shear devices designed to shear at least the upper work roll (2) or lower work roll (2 ′) along the corresponding longitudinal axis.

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