DE102020211782A1 - Decoupled rolling mill - Google Patents

Abstract

The invention relates to a rolling mill, in particular a rolling mill (20), comprising at least one roll stand (21) which is set up on a foundation (30), characterized in that the roll stand is provided with at least one spring-damping system (10) from the Foundation (30) is decoupled.

Description

The invention relates to a rolling mill, in particular a rolling mill comprising at least one roll stand that is set up on a foundation.

The invention relates in particular to a cold rolling mill, in particular one which is designed for flexible rolling.

Rolling plants are usually set up directly on a concrete foundation and fastened in the concrete foundation with anchor bolts. Mass forces and the resulting vibrations are introduced directly into the foundation.

In the process of flexible rolling by means of so-called step rolling mills, continuous regulation of the roll gap in the cold rolling process introduces different strip thicknesses in the longitudinal direction with linear, harmonic transitions into the rolling stock. In this way, for example, body panels (tailor rolled blanks) for automobile construction are produced. With this method in particular, relatively high inertia forces and the resulting vibrations are introduced into the foundation. The vibration excitation of the foundation caused by this causes long-term cracks that impair the load-bearing capacity of the foundation.

Machine components generate vibrations or structure-borne noise. These vibrations are particularly pronounced in flexible rolling due to the frequent changes in the roll gap geometry. Changes in thickness occur on average 10 times per second, so that the vibration frequency cannot settle at a defined level. The generated vibrations are therefore not constant and do not correspond to the natural frequency of the rolling mill. Conventional measures for damping vibrations in individual components are therefore not sufficient. The noise emissions resulting from the vibrations mean environmental pollution for operating personnel and the environment, which should be limited or preferably prevented.

The invention is based on the object of reducing the vibration emissions in a rolling mill, in particular in a rolling mill for flexible rolling.

The object is achieved with the features of claim 1. Advantageous embodiments of the invention emerge from the subclaims.

According to one aspect of the invention, a rolling mill is provided, in particular a rolling mill, comprising at least one roll stand that is set up on a foundation, the rolling mill being characterized in that the roll stand is decoupled from the foundation with at least one spring-damping system.

The rolling mill according to the invention is preferably designed as a cold rolling mill, reversing stand or as a rolling mill for flexible rolling.

A rolling mill within the meaning of the present invention comprises at least one rolling mill or at least one rolling stand. A rolling mill can comprise several components, for example a reel, shears and the like.

The spring-damping system of the rolling mill according to the invention is expediently arranged between at least one rolling stand and the foundation of the rolling mill. The foundation of the rolling mill can support one or more components of the rolling mill. In the rolling plant according to the invention, it can be provided that several individual components of the rolling plant, for example several rolling stands and other components, are each decoupled from the foundation with a spring-damping system.

The spring-damping system can be provided, for example, as a strip bearing, point bearing or full-area bearing between the roll stand and the foundation.

In a preferred embodiment of the rolling mill according to the invention it is provided that the spring-damping system comprises an additional flywheel. The natural frequency of the spring-mass-damper system can be influenced or adjusted via the additional flywheel.

In a particularly preferred embodiment of the rolling plant according to the invention, a base plate is provided as an additional flywheel on which the relevant rolling stand is set up. This base plate can be made of cast steel, for example.

According to the applicant's first calculations based on a certain spring-damping system, it has been found to be advantageous to select the mass of the additional flywheel so that it corresponds approximately to the mass of the roll stand in order to achieve a desired natural frequency. The additional flywheel can for example be in the order of magnitude between 100 and 200 t. This significantly increases the dead weight of the rolling mill and reduces its natural frequency.

The roll stand can comprise a base which is supported on the foundation via the spring-damping system. The base can be designed as a concrete base. The additional flywheel can, for example, be supported on the spring-damping system via the concrete base.

The spring-damping system can comprise a multiplicity of coil springs and a multiplicity of damping elements.

For example, hydraulic elements such as piston-cylinder arrangements can be provided as damping elements.

The damping elements can be provided, for example, as visco-elastic spring elements, for example in the form of buffers or cylinders.

Alternatively or additionally, the spring-damping system can comprise at least one thermoplastic material which has both spring properties and damping properties. The spring-damping system can for example comprise elements made of a polyurethane material, for example in the form of mats and / or strips.

In a preferred embodiment of the rolling mill according to the invention, it comprises at least one step rolling mill.

The invention is explained below with reference to an embodiment shown in the accompanying drawing.

With the reference number 20th is a rolling mill referred to, which is a roll stand 21 includes. The roll stand 21 comprises, in a known manner, two roll stands 22nd and in these vertically adjustable work rolls 23 and backup rolls 24 , and possibly other rollers not shown. The roll stand 21 is shown in the side view. The view shows the operating side of the roll stand 21 . The rolling mill further comprises a first reel on the inlet side 25th and a downstream second reel 26th . That to a first coil 27 The wound metal strip is taken from the first reel 25th pulled off and passes through one between the work rolls 23 of the roll stand 21 formed roll gap. The finished rolled metal strip is taken from the second reel 26th again to a second coil 28 wound up.

The rolling mill 20th According to the exemplary embodiment is a rolling mill which is designed for flexible rolling (step rolling mill) of cold strips. That from the first coil 27 Unwound metal strip is between the work rolls 23 of the roll stand 21 formed in such a way that a continuous regulation of the roll gap achieves different strip thicknesses in the longitudinal direction of the sheet metal or the rolled stock.

The roll stands 22nd are on a base plate 29 made of cast steel anchored, in turn on a base 31 rests. The base 31 is about spring damping elements 10 on the foundation 30th supported. The foundation 30th underpins the entire rolling mill 20th .

The spring damping elements 10 are in the form of a strip bearing under the base 31 arranged and decouple only the roll stand in the illustrated embodiment. In the context of the invention, however, it can be provided that all components of the rolling mill including the reel 26th , 27 from the foundation 30th are decoupled.

The spring damping elements 10 according to the embodiment comprise a combination of coil springs and damping elements. The damping elements can be designed as hydraulic dampers, for example.

List of reference symbols

10

Spring damping elements

20th

Rolling mill

21

Roll stand

22nd

Roll stand

23

Work rolls

24

Backup rolls

25th

first reel

26th

second reel

27

first coil

28

second coil

29

Base plate

30th

foundation

31

base

Claims (11)

Rolling plant, in particular rolling mill (20), comprising at least one roll stand (21) which is set up on a foundation (30), characterized in that the roll stand is decoupled from the foundation (30) with at least one spring-damping system (10) is. Rolling mill after Claim 1 , characterized in that the spring-damping system (10) as a strip bearing or point bearing or full-surface bearing between the roll stand (21) and the foundation (30) is provided. Rolling mill according to one of the Claims 1 or 2 , characterized in that the spring-damping system (10) comprises an additional flywheel. Rolling mill after Claim 3 , characterized in that a base plate (29) is provided as an additional flywheel, on which the roll stand (21) is set up. Rolling mill after Claim 4 , characterized in that the base plate (29) is made of cast steel. Rolling mill according to one of the Claims 1 until 5 , characterized in that the roll stand (21) comprises a base (31) which is supported on the foundation (30) via the spring-damping system (10). Rolling mill according to one of the Claims 1 until 6th , characterized in that the spring-damping system (10) comprises a plurality of coil springs and a plurality of damping elements. Rolling mill according to one of the Claims 1 until 7th , characterized in that the spring-damping system (10) comprises at least one thermoplastic material which has both spring properties and damping properties. Rolling mill according to one of the Claims 1 until 8th , characterized in that the spring-damping system (10) comprises elements made of a polyurethane material. Rolling mill according to one of the Claims 1 until 9 , characterized in that the spring-damping system (10) comprises mats and / or strips made of a polyurethane material. Rolling mill according to one of the Claims 1 until 10 , characterized in that it comprises at least one step rolling mill.

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