EP1074315B1 - Multi-roll stand - Google Patents

Description

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

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

The constant improvement of environmental conditions that Shortage of raw materials and the demand on the industry, Components of different types with optimal, produce product-specific properties cost-effectively, condition the development of new manufacturing processes, including the so-called "flexible rolls" is to count. The flexible rolling, wherein the nip during the rolling process according to over the band length changing thickness profile of a rolled strip is regulated, allows the process-shortening production of Band material with a calculated, component related, to the Loading case adapted thickness profile, extending in the rolling direction changes. Steel strip manufactured in this way Non-ferrous metals are for lightweight areas like the Automotive engineering, aerospace engineering and wagon construction suitable (DE-Z Fertigung, 1995, Vol. 23, No. 10, pages 40-42).

Is one anxious in conventional rolling, a possible plan and without profile changes over the entire tape length To create a flat band, you want flexible rolling make regulated tape thickness changes over the tape length. The possible reduction in strip thickness can be between a low, the rolling process still stable and a maximum decrease run by over 50% regulated.

DE 195 18 144 A1 describes a rolling mill with Work rolls, which due to the small roll diameter, the Problem of horizontal deflection during the rolling process in itself mountains. In this rolling mill is the upper and the lower Work roll each by a generated by the rolling force Peripheral force of the introduced into the support rollers rolling moments driven. In another in DE 195 18 144 A1 described multi-roll stand are the work rolls means Supported roller pairs supported. The so at two lines of contact to the back-up rollers guided work rolls allow only one limited adjustment range of the work roll bend.

From DE 22 06 912 C3 is a rolling mill with two Work rolls and oppositely movable, on the bandwidth adjustable intermediate rolls known, each in one Support roller pair are rotatably positioned, wherein the Work rolls for better adaptation to the band profile with a Roll bending device are equipped. Disadvantageous for the Use for flexible rolling are in this type of rolling mill also the horizontal deflection of the work rolls, the Walzmoment transmitting circumferential force and the relatively large Masses with regard to a required high Acceleration characteristic of the roller adjustment.

Another type of stripper support against horizontal deflection by means of laterally arranged support rollers is explained in EP 0 121 811 B1, but also has this Rolling mill concept without a strippers no drive 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 considerable amount Effort of measures to compensate for the deflection of the Roller sets such as support rollers and bending devices and are limited in terms of achievable tape thickness reduction.

The required during flexible rolling, constantly changing the target band length profile changes following position changes and the thereby requiring rolling force and rolling moment changes require a high dynamic of the roller adjustment and the roller drive. On the one hand, a secure and slip-free transmission of Ensuring rolling moments in the work rolls On the other hand, the accelerated, regulated opening and changes Close the nip the contact pressure between support and Stripper. Furthermore, it has during a roll pass depending on the thickness reduction constantly changing rolling force swelling deflection of the set of rollers result.

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

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

The subclaims include advantageous and expedient Further 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 with reference to schematic drawing figures, which illustrate in detail:

Fig. 1

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

Fig. 2

the front view of the roll stand with the working and support rolls arranged symmetrically to the vertical center plane thereof,

Fig. 3

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

Fig. 4

the dynamics of driving a work roll through two back-up rolls.

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

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

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

The balancing of the support rollers 5,6,7,8 is done by on the lower and upper backup roll chocks 10, 11 acting balancers 19,20.

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

The over the upper support rollers 7.8 in the upper Work roll 4 introduced rolling force F is through in the two Roll stand 12, 13 built-in roll adjuster 21 generated, which act on the upper backup roll chocks 11.

The force acting on the upper pair of support rollers 7,8 rolling force F allows due to the decomposition of forces in a horizontal rolling component F _h and a radial rolling force F _r when approaching a same coefficient of friction between the upper support roller 7,8 and upper work roll 4 by a factor of 1 / cos α improved introduction of the rolling moment M _w in the upper work roll 4, wherein the rolling moment M _w by the force acting in the circumferential direction of the support rollers 7.8 and the work roll 4 component F is determined _and the rolling force F (Fig. 4).

The actuated by a pressure medium Work roll bending devices 17, 18 operate between one bottom, the contact between the support rollers 5,6,7,8 and the Work rolls 3,4 ensuring and slip preventive Pressure, which at the same time a permanent balance of Work rolls 3,4 guaranteed, and one as positive Bending force acting maximum pressure.

The regulation of the work roll bending devices 17,18 takes place as a function of the rolling force F, of the bandwidth 22 and the displacement position of the support rollers 5,6,7,8.

The Ausbalanciereinrichtungen 19,20 for the support rollers 5,6,7,8 have on the back-up chocks 10,11 acting Stellzylinder with storage units for the ongoing change of Employment position of the support rollers 5,6,7,8.

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

Claims (8)

1. Roll stand (1) with multiple rolls for rolling strip-shaped rolling stock, said stand having a lower and an upper working roll (3, 4), support rolls (5, 6, 7, 8) associated with the working rolls (3, 4), roll bending devices (17, 18) for the working rolls as well as devices (21) for advancing and balancing the support rolls (5, 6, 7, 8), the lower and the upper working rolls (3, 4) of the roll stand (1) being mounted in two lower and two upper support rolls, which are arranged symmetrically with respect to the vertical roll axis plane (9-9) of the working rolls (3, 4) and are mounted in pairs in lower and upper support roll insert parts (10, 11) characterised in that, for the flexible rolling of strip stock (2), the four support rolls (5, 6, 7, 8) may be displaced independently of one another in an axial direction by the same or different distances (S) relative to the vertical centre plane (23-23) of the roll stand (1), for balancing the roll set bending which occurs and for adapting to the strip width (22).
2. Multi-roll stand according to claim 1, characterised in that the support rolls (5-8) are mounted in bearing units (10a, 10b, 11a, 11b) which are arranged in the support roll insert parts (10, 11) so as to be displaceable in the axial direction of the support rolls.
3. Multi-roll stand according to claims 1 and 2, characterised in that the pressure of the working roll bending devices (17, 18), which are actuated by a pressure medium, is adjustable between a lower pressure value for balancing the working rolls (3, 4) and for slip-preventing pressing of same against the support rolls (5, 6, 7, 8), and an upper pressure value acting as a positive bending force.
4. Multi-roll stand according to one of claims 1 to 3, characterised by the working roll bending devices (17, 18) being controlled as a function of the rolling force (F).
5. Multi-roll stand according to one of claims 1 to 4, characterised by the working roll bending devices (17, 18) being controlled as a function of the strip width (22).
6. Multi-roll stand according to one of claims 1 to 5, characterised by the working roll bending devices (17, 18) being controlled as a function of the displacement position of the support rolls (5, 6, 7, 8).
7. Multi-roll stand according to one of claims 1 to 6, characterised in that the balancing devices (19, 20) for the support rolls (5, 6, 7, 8) have adjusting cylinders acting on the support roll insert parts (10, 11) with storage units for continuously changing the advancing position of the support rolls (5, 6, 7, 8).
8. Multi-roll stand according to one of claims 1 to 7, characterised by drive motors (14) for the support rolls (5, 6, 7, 8), which motors are attached to the support roll insert parts (10, 11) and/or the bearing units (10a, 10b, 11a, 11b).

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