EP1420898B1 - Roll stand for rolling different rolling stock that requires different roll separating forces - Google Patents

Abstract

A rolling mill frame for the rolling of different rolled stock which requires different rolling forces and which has working rolls, back-up rolls, optionally a roll being device for the working rolls and optionally a device for adjusting and balancing the back-up rolls. The mill has pairs of adjusting cylinders between the roll stand and the chocks of the rolls which avoid large friction losses. The adjusting cylinders are each comprised of a telescoping cylinder in which a first cylinder with a large diameter for high rolling forces and a concentric cylinder with smaller diameter for smaller rolling forces are provided.

Description

The invention relates to a roll stand for rolling different rolling stock, which requires different rolling forces, with a lower and an upper work roll, the work rolls associated supporting trolleys, if necessary. A roll bending device for the work rolls, and if necessary, facilities for hiring and Balancing the support roller and with pairs of Anstellzylindem between the Roller stand and the chocks.

The hydraulic adjusting cylinders are used to generate the rolling force in rolling mills used. For the rolling mills, a large variety of products is currently decisive, resulting in large rolling force differences between the. individual products arise for the same rolling stand.

It is known, the different rolling forces of two Anstellzylindem ever Apply rolling mill Here then has a low rolling force the same Frictional loss such as high rolling force, causing difficulties in the Regulation arise. A large part of the high friction losses is at the expense the seals, the piston rod and the piston in the piston-cylinder unit.

For adjusting the rolling force in rolling stands, in particular in strip rolling stands for hot or cold rolling, it is known (DE 40 10 662 C2), in a simple manner the percentage rolling force fluctuations in the course of the rolling force control over To keep the entire rolling force range extremely small by the two adjusting cylinder one each in a cylinder housing on a cylinder pin and have in a cylinder collar guided hat piston whose from the inner Hutboden formed central piston surface and formed by the Hutrand ring piston surface independently or individually or together with pressure medium can be acted upon. As a result, however, only more friction surfaces created that make the regulation more difficult.

From JP-A-60-162513 a rolling mill is known, although without chocks works, but uses a telescopic cylinder to adjust the rolling forces. This should achieve high rolling reductions with high surface quality.

In JP - A - 62 130 705 is also not the arrangement of the telescopic cylinder between the chock and the roll stand. The telescopic cylinder is rather located in the bottom of the roll stand and for the back-up rolls intended.

The initially described rolling stand is known from EP-A-0 618 019. There are already simple piston-cylinder units between the Walzenständem and provided the chocks for the work rolls.

The invention is based on the object, in the generic rolling mill to reduce the friction losses, thereby achieving a more accurate control.

The stated object is achieved in that the adjusting cylinder each consist of a telescopic cylinder, in which a first, concentric Large diameter cylinder for high rolling forces and a second concentric one Cylinder with smaller diameter provided for small rolling forces are, wherein the pressure medium connection for the annular pressure chamber of the large Piston forms a connection to the bottom of the small piston. This creates only frictional forces on the seal between each cylinder and associated Piston. The friction losses are consequently lower overall and This allows a more accurate control of the rolling forces can be achieved. Furthermore is saved by the connection to the bottom to construction space

In an embodiment of this basic idea, it is proposed that the first, large cylinder with large diameter forms an outer, annular pressure chamber, the pressure medium presses a large piston ring against the cylinder bottom. Of the The advantage is that the large piston during operation of the smaller piston is at rest and with smaller rolling forces the friction at the large Piston is completely avoided and only friction on the smaller piston, the is much lower, arises.

In an embodiment of the invention, it is provided that the smaller piston of second cylinder of smaller diameter inside the big piston one Pressure chamber for actuating the smaller piston forms. This can be a Advantage of the telescopic system can be used, with a significant space savings connected is.

A further development provides that the pressure medium connection for the smaller piston through the cylinder wall and through the cylinder bottom of the larger cylinder is guided. The advantage is in short media feeds and in one Distribution of the pressure medium connections on two sides of the adjusting cylinder.

In a further embodiment, it is proposed that the pressure medium connection for the annular pressure chamber of the large piston connects to the bottom of the small piston forms. As a result, construction space can also be saved here become.

A further advantageous embodiment results from the fact that the first, large Cylinder closable by means of a sealing ring sealing the large piston is to which the pressure medium connection for the outer, annular Pressure chamber is connected. The end ring may face sealing rings accommodate the large piston and allows the formation of the annular pressure chamber.

In the sole figure of the drawing is a rolling stand for rolling different Walzgut, which requires different rolling forces, with no closer illustrated lower and upper work rolls, the work rolls assigned Back-up rolls, if necessary, a roll bending device for the work rolls, as well as if necessary, facilities for adjusting and balancing the back-up rollers preceded. puts. There are pairs of Anstellzylindern 3 between the roller stands 1 and a chock 2 shown.

The adjusting cylinder 3 each consist of a telescopic cylinder 4. In the telescopic cylinders 4 is in each case a first, large cylinder 5 with an outer, annular pressure chamber 5a, which has a large piston ring 5b provided. The large piston 5d is with a large ring seal 6 in the cylinder housing 7 sealed.

Down the cylinder housing 7 is closed by means of a closing ring 8, wherein also ring seals 9 and 10 seal the large piston 5d. When acted upon by a pressure medium connection 11 in the annular Pressure chamber 5a, the large piston 5d is pressed against the cylinder bottom 5c, as drawn. The back pressure is via a pressure medium connection 12 built. Within the first, large piston 5d is a pressure chamber 13th designed, which can be acted upon by the pressure medium connection 14. The Pressure chamber 13 is down through a second, smaller cylinder 15, the in the large piston 5d slides, completed with a second smaller piston 15a.

The pressure medium connection 14 communicates with the pressure chamber 13 via a pressure medium channel 16, which passes through the upper portion of the cylinder housing 7, in Connection. The second, smaller piston 15a is with corresponding sealing rings 17, 18, whose diameter is smaller, sealed in the second, smaller cylinder 15.

Another sealing ring 19 is located on the smaller piston 15a within the big piston 5d. The pressure medium connection 14 leads the pressure medium through the Cylinder wall 5e and through the cylinder bottom 5c.

In the left half of the illustration, the smaller piston 15a is in the upper position and in the right half of the illustration in the lower position.

The pressure medium connection 11 provides for the large, annular pressure chamber 5a a connection 20 to the bottom 15b of the smaller piston 15a ago.

The smaller piston 15a of the second, smaller cylinder 15 with the smaller one Diameter in the interior 21 forms the pressure chamber 13 for actuating the small Piston 15a.

LIST OF REFERENCE NUMBERS

1

roll housing

2

chock

3

Adjusting cylinder

4

telescopic cylinders

5

first, big cylinder

5a

annular pressure chamber

5b

big piston ring

5c

cylinder base

5d

big piston

5e

cylinder

6

ring seal

7

cylinder housing

8th

end ring

9

ring seal

10

ring seal

11

Pressure medium connection

12

Pressure medium connection

13

pressure chamber

14

Pressure medium connection

15

second, smaller cylinder

15a

second, smaller piston

15b

bottom

16

Pressure fluid channel

17

sealing ring

18

sealing ring

19

sealing ring

20

connection

21

Heart of the big butt

Claims (6)

1. Roll stand for rolling different rolled stock, which requires different rolling forces, with a lower and an upper working roll, backing rolls associated with the working rolls, optionally a roll bending device for the working rolls, as well as optionally devices for adjusting and balancing the backing rolls and with pairs of adjusting cylinders (3) between the roll stands (1) and the chocks (2), characterised in that the adjusting cylinders (3) each consist of a telescopic cylinder (4) in which a first concentric cylinder (5) with a large diameter for high rolling forces and a second concentric cylinder (15) with a smaller diameter for small rolling forces are provided, wherein the pressure medium connection (11) for the annular pressure chamber (5a) of the large piston (5d) forms a connection (20) to the underside (15b) of the small piston (15a).
2. Roll stand according to claim 1, characterised in that the first, large cylinder (5) with large diameter forms an outer annular pressure chamber (5a), the pressure medium of which presses a large piston ring (5b) against the cylinder base (5c).
3. Roll stand according to one of claims 1 and 2, characterised in that the smaller piston (15a) of the second cylinder (15) with smaller diameter forms in the interior (21) of the large piston (5) a pressure chamber (13) for actuation of the smaller piston (15a).
4. Roll stand according to claim 3, characterised in that the pressure medium connection (14) for the smaller piston (15a) is guided through the cylinder wall (5e) and through the cylinder base (5c) of the larger cylinder (5).
5. Roll stand according to one of claims 1 to 4, characterised in that the first, large cylinder (5) has a pressure medium connection (12) opening in the region of the cylinder base (5c).
6. Roll stand according to one of claims 1 to 5, characterised in that the first, large cylinder (5) is closable by means of a closure ring (8), which seals off the large piston (5d) and with which the pressure medium connection (11) for the outer annular pressure chamber (5a) is connected.

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