DE102022207734A1 - X-Shape roller stand contour to improve the constriction behavior and material use (weight optimization) of a roller stand - Google Patents

Abstract

The invention relates to a roll stand (1) of a roll stand for rolling metallic material, the roll stand (1) having an upper crosshead (2) and a lower crosshead (3), the upper crosshead (2) and the lower crosshead (3 ) are connected to two stand posts (4, 5), so that the roll stand (1) has an outer stand width (BA) and an inner stand window width (BI). In order to enable such a roll stand to have improved constriction behavior under load, but still have a construction that is as light as possible, the invention provides that at least one of the two crossheads (2, 3) has the outer stand width (BA) and that in the area at least one section (HR) of the stand posts (4, 5) the outer width is reduced compared to the outer stand width (BA) to a reduced width (HR), which is at most 97.5% of the outer stand width (BA).

Description

The invention relates to a roll stand of a roll stand for rolling metallic material, the roll stand having an upper crosshead and a lower crosshead, the upper crosshead and the lower crosshead being connected to two stand posts, so that the roll stand has an outer stand width and an inner stand window width having.

A roller stand of the generic type is from the EP 0 993 880 A1 known. The stand is welded together from a total of four parts. The stand posts and the crossheads have a constant external width (apart from a lower, wider fastening section at the transition from the stand posts to the lower crosshead, which is also not important in the present invention).

This shows a similar solution WO 96/26022 A1 , in which the aim is to have a low weight, but this is achieved here by providing a rib structure in the parts of the roll stand.

The hydraulic adjusting cylinder for the rollers is sometimes attached using clamps. In rolling stands with higher rolling force, it can be disadvantageous that the hydraulic adjusting cylinder does not have full surface support.

Another disadvantage of the previously known solutions is that unfavorable deformations occur under load and relatively large constrictions occur in the direction of the width of the roll stand. To counteract this, a relatively massive construction is required, which disadvantageously results in a high weight. The disadvantage is that a correspondingly massive design is also required for the reliable support of the adjusting cylinders on the roll stand.

Thus, in the previously known solutions there is an unfavorable constriction behavior under load, which can lead to disadvantageous jamming of the chocks in the stand window.

The invention is based on the task of developing a roll stand of the type mentioned in such a way that it has improved constriction behavior under load. Nevertheless, the lightest possible construction should be possible.

The solution to this problem by the invention is characterized in that at least one of the two crossheads has the outer stand width and that in the area of at least a section of the stand posts, the outer width is reduced compared to the outer stand width to a reduced width, which is at most 97.5 % of the outer stand width. The reduced width is preferably a maximum of 96.0% of the outer stand width.

The reduced width is preferably given over at least 80% of the extent of the two stand posts (in the direction of the height of the roll stand).

A particularly preferred embodiment of the invention provides that the two stand posts define a maximum window distance, with a transition being formed in the transition area of the stand posts into the crossheads, the maximum width of which is greater than the maximum window distance. The maximum width is preferably at least 102% and particularly preferably at least 104% of the maximum window distance. The transition area of the stand posts into the crossheads is preferably designed as a rounding.

On at least one of the crossheads, at least one extension protruding from the base contour of the roll stand can be formed, which forms a contact surface for another component (namely in particular for a hydraulic adjusting cylinder). The extension is preferably made from the material of the roll stand and is formed in one piece with it.

The crossheads and the two stand posts are preferably designed as a one-piece, originally formed component.

The proposed concept is based on the fact that the crossheads are relatively wide and stable, while the width of the stand posts is deliberately reduced in sections. This results in an improved adaptation of the roll stand to the expected tension curve. Constrictions can be specifically avoided.

The transition from the stand post to the crosshead (which can be referred to as a corner area) is designed to be more flexible in comparison to the previously known solutions, which is advantageous in particular due to the combination of the stand posts with reduced width and the rounded transition from the stand post to the crosshead.

Thus, it becomes possible by reducing the outer width (ie retracting) of the stand posts and preferably by reducing the Stand thickness and the proposed design of the transitions from the stand posts to the crosshead to make the roller stand elastic in a special way, which has a positive effect on the constriction behavior. In addition, a relatively low weight of the roller stand is achieved. On rolling stands with higher rolling force, full-surface support of the hydraulic adjusting cylinder can be achieved.

Due to the above-mentioned retraction or engagement of the stand post and in particular through the transition from the stand post to the crosshead and the pronounced wider stand window shoulder achieved as a result, the flow of force from the stand post to the crosshead is somewhat redirected, whereby a higher degree of elasticity is achieved. This reduces the deformation of the roll stand posts and thus the stand constriction.

Extensions (“balconies”) can be cast on to support the adjusting cylinders, so that the cylinders are in reliable contact.

This means that a lower weight of the roll stand (reducing the roll stand thickness) can be achieved with the same rolling load. This not only results in material savings, but also improved mountability of the stand; Transport also becomes correspondingly easier.

The proposed solution can be used on any type of rolling stand. This applies in particular to hot and cold rolling mills, to steel, aluminum and non-ferrous metals.

According to the inventive concept - as explained - an adjustment of the stand geometry takes place, particularly in the transition between the stand crosshead and the stand post, so that the constriction behavior (in the sense of a minimal constriction) is favorably influenced without increasing the use of materials. This reduces the amplitude of the necking between large and small rolling loads.

Due to this change in geometry, particularly in the corners of the roll stand (i.e. at the transition from the stand posts to the crosshead), the roll stand thickness can also be reduced with the same constriction behavior.

In order to ensure full-surface support for the hydraulic adjusting cylinder, the extensions mentioned (i.e. bulges or “balconies”) are provided on the side of the stand, which are also used to fasten the hydraulic adjusting cylinder.

Accordingly, even with the same material used, the roll stand can be subjected to higher loads with identical constriction behavior.

When modernizing existing plants, it is possible to replace the existing rolling stands with those in accordance with the present proposal. This allows conversion to a higher rolling force. In particular, reworking of existing classic roll stands is possible according to the invention proposal, which is advantageous from the point of view of sustainability and the conservation of resources (“Green Steel” / lower energy consumption).

Logistics is equally positively influenced, as there are lower transport costs as a result of lighter roller stands. In this context, it should be mentioned that transport may become easier because special transports (over 90 t) can be dispensed with.

For smaller rolling stands (less than 15 MN rolling force) it is also possible to manufacture the roll stand from rolled raw material.

In multifunctional rolling stands (e.g. skin-passing and reducing operation), the proposed design of the roll stand allows the constriction behavior under load to be adjusted so that the stand window clearances are approximately the same for both operating modes.

• 1 einen erfindungsgemäßen Walzenständer eines Walzgerüsts in der Vorderansicht und
• 2 einen ähnlich ausgebildeten erfindungsgemäßen Walzenständer eines Walzgerüsts in perspektivischer Darstellung.

The drawing shows exemplary embodiments of the invention. Show it:

• 1 a roll stand according to the invention of a roll stand in the front view and
• 2 A similarly designed roll stand according to the invention of a roll stand in a perspective view.

The figures each show a roller stand 1, which essentially has an upper crosshead 2 and a lower crosshead 3, the two crossheads 2, 3 being connected to one another with two stand posts 4 and 5.

The roller stand 1 has a total height H. The two crossheads 2 and 3 have a height H ₂ and H ₃ respectively; the two stand posts 4 and 5 have a height H _ST .

The two stand posts 4 and 5, together with the two crossheads 2 and 3, form a window for receiving the chocks, which has an inner stand window width B _I. The window can sometimes widen even further, so that a maximum window distance B _Fmax between the two stand posts 4 and 5. For the purposes of the present discussion, the transition from the post 4 or 5 to the crosshead 2 or 3 is defined where the end of the window is located.

It is essential that at least one of the two crossheads 2 and 3 has an outer stand width B _A , with the outer width of the roller stand 1 being reduced to a reduced width B in the area of at least one section H _R of the stand posts 4 and 5 compared to the outer stand width B _{A R} is reduced. This reduction is designed so that the reduced width B _R is at most 97.5% of the outer stand width B _A.

Like in particular 1 can be seen, the reduced width B _R is not provided over the entire height H _ST of the stand post 4 or 5, but only over part of its height H _R. At the _height position The transition assumes a maximum width B _Ü , which is greater than the maximum window distance B _Fmax between the two stand posts 4 and 5.

This configuration results in a slight outward deflection of the base course of the stand posts towards the crosshead, so that when the roller stand 1 is loaded, the tensile stress runs as shown in 1 is indicated by Z.

This ensures that when the roller stand 1 is loaded, the window between the two stand posts 4 and 5 for receiving the chocks does not become unacceptably narrowed.

How out 1 As can be seen, the transition 6 from the stand posts 4 and 5 to the upper crosshead 2 begins where the reduced width B _R of the stand posts 4, 5 ends; The same applies to the transition from the stand posts 4 and 5 to the lower crosshead 3. As explained, the transition 6 increases the window width to a maximum value of Bü, which is greater than the maximum window distance B _Fmax of the section of the window intended for use, which between the two stand posts 4 and 5 is formed.

The interaction of the width-reduced section H _R of the stand posts 4 and 5 with the transitions 6 and the maximum width B _Ü of the transition provided here results - as explained - in a course of the tensile stress Z as shown in 1 is indicated schematically. Under load on the roll stand 1 and the resulting deformation, a constriction of the window between the two stand posts 4 and 5 can be avoided.

The roll stand 1 preferably has a constant thickness D. This is preferably between 80 mm and 120 mm, in particular 100 mm.

In particular, the height H ₃ of the lower crosshead can be variably adjusted for each system to be designed; The other geometric conditions can be retained, so that in particular the constriction behavior of the roll stand remains unchanged.

How out 2 results, extensions 7 protruding from the base contour of the roll stand 1 can be formed on the crossheads 2, 3, which have a contact surface 8 which are provided for the hydraulic adjusting cylinders (not shown) for the rolls. The extensions 7 provided can ensure full-surface support of the hydraulic adjusting cylinder, which is particularly relevant for rolling stands with higher rolling forces. Furthermore, the adjusting cylinders can be easily attached here.

List of reference symbols:

1

Roll stand

2

upper crosshead

3

lower crosshead

4

Stand post

5

Stand post

6

Transition from the stand post to the crosshead

7

appendage

8th

investment area

B.A

outer stand width

BI

inner stand window width

BR

reduced width

BF max

maximum window distance between the stud posts

BÜ

maximum width of the transition

H

entire height of the roller stand

H2

Height of the upper crosshead

H3

Height of the lower crosshead

HST

Height of stand posts

MR

Height/section of stand posts with reduced width

D

Thickness of the roll stand

Z

Course of tensile stress

X

Elevation of start of transition

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0993880 A1 [0002]
• WO 9626022 A1 [0003]

Claims (10)

Roll stand (1) of a roll stand for rolling metallic material, the roll stand (1) having an upper crosshead (2) and a lower crosshead (3), the upper crosshead (2) and the lower crosshead (3) having two stand posts (4, 5) are connected so that the roll stand (1) has an outer stand width (B _A ) and an inner stand window width (B _I ), characterized in that at least one of the two crossheads (2, 3) has the outer stand width ( B _A ) and that in the area of at least one section (H _R ) of the stand posts (4, 5) the outer width is reduced compared to the outer stand width (B _A ) to a reduced width (H _R ), which is at most 97.5% the outer stand width (B _A ). roller stand Claim 1 , characterized in that the reduced width (B _R ) is at most 96.0% of the outer stand width (B _A ). roller stand Claim 1 or 2 , characterized in that the reduced width (B _R ) is given over at least 80% of the extent (H _R ) of the two stand posts (4, 5). Roller stand according to one of the Claims 1 until 3 , characterized in that the two stand posts (4, 5) have a maximum window distance (B _Fmax ), with a transition (6) being formed in the transition area of the stand posts (4, 5) into the crossheads (2, 3), the maximum of which Width (B _Ü ) is greater than the maximum window distance (B _Fmax ). roller stand Claim 4 , characterized in that the maximum width (B _Ü ) is at least 102% of the maximum window distance (B _Fmax ). roller stand Claim 5 , characterized in that the maximum width (B _Ü ) is at least 104% of the maximum window distance (B _Fmax ). Roller stand according to one of the Claims 4 until 6 , characterized in that the transition area of the stand posts (4, 5) into the crossheads (2, 3) is designed as a rounding. Roller stand according to one of the Claims 1 until 7 , characterized in that at least one extension (7) protruding from the base contour of the roller stand (1) is formed on at least one of the crossheads (2, 3), which forms a contact surface (8) for another component. roller stand Claim 8 , characterized in that the extension (7) is formed from the material of the roller stand (1) and is formed in one piece with it. Roller stand according to one of the Claims 1 until 9 , characterized in that the crossheads (2, 3) and the two stand posts (4, 5) are designed as a one-piece, original formed component.

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