EP1074315A2 - Multi-roll stand - Google Patents

Abstract

A flexible strip rolling mill stand, with four independently axially displaceable back-up rolls (5-8), is new. A multi-roll strip rolling mill stand, used for flexible rolling, has four back-up rolls (5-8) which can be independently axially displaced relative to one another by the same or different distances from the vertical central plane of the stand (1) for equalization of roll set bending and for adaptation to the strip width.

Description

The invention relates to multi-roll stands for rolling strip-shaped rolling stock, with a lower and an upper Work roll, backup rolls assigned to the work rolls, Roll bending devices for the work rolls as well Devices for adjusting and balancing the backup rolls, the lower and the upper work roll of the roll stand in two lower and two upper back-up rolls are mounted, the symmetrical to the vertical roll axis plane of the work rolls arranged and in pairs in lower and upper Back-up roller chocks are stored.

A multi-roll stand of this type is from the JP 10 263 632 A known.

The constant improvement of environmental conditions Shortage of raw materials and the demands on the industry Components of different types with optimal, to produce product-specific properties cost-effectively, require the development of new manufacturing processes, for which the so-called "flexible rollers" is to be counted. The flexible rolling, in which the roll gap during the rolling process corresponding to the changing thickness profile of a rolled strip over the strip length is regulated, the process-shortening production of Strip material with a calculated, component-related, to the Load case adapted thickness profile, which is in the rolling direction changes. Rolled steel strip and Nonferrous metals is for lightweight areas like that Automotive engineering, aerospace engineering and wagon construction suitable (DE-Z Fabrication, 1995, Vol. 23, No. 10, pages 40-42).

If you are striving with conventional rolling, try one flat and without profile changes over the entire length of the belt You want to produce flat strip with flexible rolling Establish regulated strip thickness changes over the strip length. The possible strip thickness reduction can be between a small, the rolling process still stable and a maximum decrease of over 50%.

DE 195 18 144 A1 describes a rolling mill Work rolls, which due to the small roll diameter the Problems of horizontal deflection during the rolling process itself recover. The top and bottom of this mill are Work roll each generated by the rolling force Circumferential force of the rolling moments introduced into the backup rolls driven. In another in DE 195 18 144 A1 The multi-roll stand described are the work rolls by means of Support roller pairs supported. The two lines of contact work rolls led to the backup rolls allow only one restricted adjustment range of the work roll bending.

DE 22 06 912 C3 is a roll stand with two Work rolls and can be moved in opposite directions on the bandwidth adjustable intermediate rolls known, each in a Backup roller pair are rotatably positioned, the Work rolls for better adaptation to the strip profile with one Roll bending device are equipped. Disadvantage for the Flexible rolling are used in this type of rolling mill also the horizontal deflection of the work rolls, which the Rolling force transmitting circumferential force and the relatively large Masses in terms of a required high Acceleration property of the roll adjustment.

Another type of work roll support against horizontal deflection by means of support rollers arranged on the side is explained in EP 0 121 811 B1, but this also shows Rolling mill concept without a drive of the work rolls none Improvement of the rolling moments introduced into the work rolls out.

Multi-roll stands according to EP 0 665 067 B1 have Work rolls with the smallest diameter and sufficient Support, however, require a not insignificant Effort to compensate for the deflection of the Roll set such as support rollers and bending devices and are limited with regard to the achievable strip thickness reduction.

The required changes in the strip length profile required for flexible rolling following changes in position and the require changes in rolling force and rolling moment a high dynamic of the roll adjustment and the roll drive. On the one hand, a safe and slip-free transmission of the Rolling moments in the work rolls are guaranteed, on the other hand, the accelerated, regulated opening and changes Closing the roll gap the contact force between the support and Work roll. Furthermore, the has during a roll pass depending on the thickness reduction constantly changing rolling force swelling deflection of the roller set.

The invention has for its object a roll stand for to develop flexible rolls of strip material.

This object is achieved by a Roll stand with the features of claim 1.

The sub-claims contain advantageous and expedient Developments of the invention.

Fig. 1

eine Seitenansicht des erfindungsgemäßen Walzgerüstes,

Fig. 2

die Vorderansicht des Walzgerüstes mit symmetrisch zur senkrechten Mittelebene desselben angeordneten Arbeits- und Stützwalzen,

Fig. 3

die Vorderansicht des Walzgerüstes mit zu den Arbeitswalzen gegensinnig axial verschobenen Stützwalzen und

Fig. 4

die Dynamik des Antriebes einer Arbeitswalze durch zwei Stützwalzen.

The invention is explained below on the basis of schematic drawing figures, which represent the following in detail:

Fig. 1

a side view of the rolling stand according to the invention,

Fig. 2

the front view of the roll stand with work and backup rolls arranged symmetrically to the vertical central plane thereof,

Fig. 3

the front view of the rolling stand with support rollers axially displaced in opposite directions to the work rolls and

Fig. 4

the dynamics of the drive of a work roll by two backup rolls.

The roll stand 1 according to FIGS. 1-3 for flexible rolling of Strip material 2 has a lower and an upper work roll 3, 4 to avoid horizontal deflection in two lower and two upper support rollers 5, 6; 7, 8 are mounted, the symmetrical to the vertical roller axis plane 9-9 of Work rolls 3,4 arranged and in storage units 10a, 10b, 11a, 11b displaceable in the axial direction in the lower and upper Backing roll chocks 10, 11 are mounted in the two Roll stands 12, 13 of the roll stand 1 vertically and horizontally are guided.

The support rollers 5,6; 7,8 are through to the Backing roll chocks 10, 11 attached motors 14 driven.

The lower and the upper work roll 3, 4 are in the lower one and upper work roll chocks 15,16 stored in the two roller stands 12, 13 guided and vertically displaceable can be acted upon by work roll bending devices 17, 18.

The balance of the support rollers 5.6; 7.8 is done by on the lower and upper backup roll chocks 10,11 Acting balancing devices 19.20.

Under the lower backup roll chocks 10 are in the two roller stands 12, 13 adjusting devices 24 for Adjusting the passline of the roll stand 1 installed.

The over the upper support rollers 7,8 in the upper Work roll 4 initiated rolling force F is by in the two Roll stands 12, 13 built-in roll setting devices 21 generated that act on the upper backup roll chocks 11.

The rolling force F acting on the upper pair of support rollers 7, 8 enables a factor of a factor due to the breakdown of forces into a horizontal rolling force component F _h and a radial rolling force component F _r when an equal coefficient of friction is applied between the upper support roller 7.8 and the upper work roller 4 1 / cos α Improved introduction of the rolling moment M _w into the upper work roll 4, the rolling moment M _{w being} determined by the component F _{u of} the rolling force F acting in the circumferential direction of the support rolls 7, 8 and the work roll 4 (FIG. 4).

The operated by a pressure medium Work roll bending devices 17, 18 work between one lower, the contact between the support rollers 5,6; 7.8 and den Work rolls 3.4 ensuring and preventing slippage Contact pressure, which is also a permanent balancing of the Work rolls 3.4 guaranteed, and one as a positive Bending force acting maximum pressure.

The regulation of the work roll bending devices 17, 18 takes place depending on the rolling force F, on the strip width 22 and the displacement position of the support rollers 5,6,7,8.

The balancing devices 19, 20 for the backup rolls 5,6,7,8 have acting on the support roller chocks 10,11 Actuating cylinder with storage units for the ongoing change of Position of support rollers 5,6,7,8.

The four support rollers 5,6,7,8 are to compensate for the occurring roll set deflection and to adapt to the Band width 22 of the strip material 2 by the same or different routes S independently of each other vertical center plane 23-23 of the rolling stand 1 in opposite directions axially displaceable.

Claims (8)

Multi-roll stand for rolling strip-shaped rolling stock, with a lower and an upper work roll, the work rolls assigned backup rolls, roll bending devices for the Work rolls and facilities for hiring and Balancing the backup rolls, the lower and the upper Work roll of the roll stand in two lower and two upper Back-up rollers are mounted that are symmetrical to the vertical Roller axis plane of the work rolls arranged and in pairs in lower and upper backup roller chocks are stored, characterized in that for flexible rolling of Belt material (2) the four support rollers (5-8) to compensate for the occurring roll set deflection and to adapt to the Bandwidth (22) over the same or different distances (S) to the vertical center plane (23-23) of the roll stand (1) can be moved independently of one another in the axial direction. Multi-roll stand according to claim 1, characterized in that that the support rollers (5-8) in bearing units (10a, 10b, 11a, 11b) are stored in the support roller chocks (10, 11) in Axial direction of the support rollers are arranged displaceably. Multi-roll stand according to claim 1 and 2, characterized characterized in that the pressure of a pressure medium actuated work roll bending devices (17, 18) between a lower pressure value for balancing the work rolls (3,4) and to prevent slippage against the same Back-up rolls (5.6; 7.8) and one as a positive bending force acting upper pressure value is adjustable. Multi-roll stand according to one of claims 1 to 3, characterized by a regulation of Work roll bending devices (17, 18) depending on the Rolling force (F). Multi-roll stand according to one of claims 1 to 4, characterized by a regulation of Work roll bending devices (17, 18) depending on the Bandwidth (22). Multi-roll stand according to one of claims 1 to 5, characterized by a regulation of Work roll bending devices (17, 18) depending on the Position of the support rollers (5-8). Multi-roll stand according to one of claims 1 to 6, characterized in that the balancing devices (19.20) for the backup rolls (5.6; 7.8) on the Back-up roller chocks (10, 11) with adjusting cylinders Storage units for changing the position of employment of the support rollers (5.6; 7.8). Multi-roll stand according to one of claims 1 to 7, characterized by on the support roller chocks (10,11) and / or the bearing units (10a, 11b, 11a, 11b) Drive motors (14) for the support rollers (5,6,7,8).

Images