DE3247798A1 - ROLLING DEVICE - Google Patents

Description

The invention relates to a rolling device according to the preamble of the main claim.

When rolling steel slabs or the like deforms the rolls due to the rolling pressure acting between the rolls and the rolled slab or deflected. Such a deflection of the rollers must be compensated. In practice, in a rolling mill various rolled products with different dimensions and / or different quality rolled in one and the same Walζvorrichtung so that different rolling pressures occur. The rollers are therefore deformed or deflected in various ways. This makes equalizing or compensating for the deflection of the rollers considerably more difficult.

With modern rolling devices there are high requirements placed on the quality of the rolled products. In particular, the rolling mill should be improved Have a cross-sectional profile and a flat surface. So far, in order to meet these requirements two procedures combined. This is the so-called "initial roll curvature or convexity process" (roll inital crown) and the "roll deflection process" . However, even if these two methods were combined, they did not become satisfactory in every case Results achieved / because the rolling with the initial roll curvature requires frequent replacement of the

BATH ORIGINAL

TER MEER - MÜLLER STEINMEISTER ¹ .V. / ^S V ^ OMO 3247798

Rolling makes it necessary and in the roll deflection process the bending force due to the lower stability the roller body and / or the roller neck is limited.

To overcome these difficulties, a rolling mill with six roll stands has been used, whose middle rolls for controlling the deflection of the work rolls are offset in the axial direction. Such a rolling mill however, requires high installation costs. In addition, it is difficult to control the curvature of the rolled material control, since the middle rolls are arranged asymmetrically in relation to the rolling train and also the rolls of a are exposed to heavy wear and tear. Moreover, the conversion of a conventional rolling mill requires four Roll stands in a rolling train with six roll stands a downtime of up to ten days during production is interrupted. Overall, this results in a considerable increase in production costs.

As an alternative, there are rollers with variable roller arching or crown (variable crown) has been used. To describe such a roller, in the following briefly as Designated VC roller, reference should already be made here to FIG. 1 of the drawing. The roller shown there comprises an axle 1, a sleeve 2 and an annular space or gap 3 between the axle and the sleeve. The camber of the VC roller (i.e. the radial extent of the roller) is controllable by using a printing medium such as Water, oil, gas or the like under high pressure of a pressure medium unit 4 via a through the axis 1 leading line 5 initiated into the gap 3 and the pressure

BATH ORIGINAL

TER MEER · MÖLLER · STEINMEISTER *. ":: -. 'SUMiT & MQ * 3 2 4 / / O ö

is set with the aid of the unit 4.

Usually, the VO roller is primarily used instead the pressure roll of a rolling train with several roll stands is used. The advantage of the VC roller is that that the curvature of the roll is easy to change during rolling. However, the reduction is at that The rolling process is higher than the reduction normally occurring during rolling, in some cases the rolling

deflection not only by controlling the curvature
of the VC roller.

In the course of efforts to improve the efficiency of the rolling process
and to improve the quality of the rolled products, the need has arisen for rolling apparatuses which
Allow higher reduction rolls.

The invention is directed to the formation of an existing rolling device by simple modifications in such a way that it can be rolled with a higher reduction than in conventional rolling devices and that
thereby controlling the thickness of the rolled material
is improved. In particular, the roll deformation or deflection in the event of a strong reduction should also occur

the wear of the rollers and / or thermal changes in the curvature of the rollers can be compensated for.

The invention results in detail from the characterizing part of the main claim. Advantageous further training of the invention are specified in the subclaims.

According to the invention are in the upper set of rollers or the

: ■ _BAD ORIGINAL

TER MEER · MÖLLER · STEINMEISTER

lower roll set, but preferably between one work roll and one in both roll sets this supporting pressure roller is provided with two intermediate rollers, each supported by support roller assemblies are supported. The support roller arrangements are towards the corresponding intermediate rollers and can be moved away from these. The deflection can be adjusted by adjusting the displacement of the support rollers the intermediate rolls in the horizontal direction and thus control the profile of the rolled material.

The diameter of that work roll to which the intermediate rolls are assigned is preferably smaller than the diameter of the other work roll. Since the work roll has a smaller diameter for a given Rolling pressure is bent or deflected more strongly than the conventional work roll, the profile can better control of the rolled material.

The support roller arrangements preferably comprise a plurality of support rollers which are arranged coaxially next to one another and which are independent are displaceable towards and away from each other towards and away from the associated intermediate roller.

At least one of the work rolls, the intermediate rolls or the pressure rolls can additionally be equipped with a conventional one Roll bending device to be equipped. The pressure roller can be a VC roller.

In addition, to eliminate local wear of the rollers and to improve the control of the roller

BATH ORIGINAL

TER MEER - MÜLLER · STEINMEISTEf? "."; *: SÖMlTÖMO ^ * 3247798

deflection, the upper and lower work rolls can be moved in the axial direction.

By selecting suitable combinations of the above-mentioned measures, the deformation of the work rolls can be reduced control in a variety of ways, so that the varied and complex influences on the profile of the rolled Materials can be better mastered.

In the following, preferred exemplary embodiments of the invention are explained in more detail with reference to the drawing.

Fig. 1 shows a partially cut away

Long side view of a VC roller,

15 as in an inventive

Rolling device is used;

Figs. 2 + 3 are side views of the upper half

a rolling device according to the invention; 20th

Fig. 4 is an overall side view of the present invention Rolling device;

Figure 5 is a view taken in the direction of arrows 25V-V in Figure 2;

Fig. 6 is a view in the direction of arrows VI-VI in Fig. 3;

_f /.6AD ORIGINAL

TER MEER · MÜLLER · STEINMEISTE, «*. ";" SUMITOMO "32 4 7 7 9

Figs. 7 (A) - 7 (D) are schematic longitudinal sections

of modified embodiments of the VC roller from FIG. 1;

Figures 8 (A) - 8 (C) are schematic side views

of modified embodiments of the rolling device according to the invention;

9 shows schematically a control unit

direction for the whale device according to the invention;

Fig. 10 schematically illustrates the

Construction of a rolling mill with a

whale device according to the invention;

Fig. 11 graphically shows the thickness distribution

of workpieces after rolling with the aid of a roller according to the invention

contraption;

Fig. 12 shows schematically the structure of a

Adjustment mechanism for a work roll or an intermediate roll of the roll

contraption.

2 to 4 comprises a rolling device according to the invention an upper and a lower set of rolls, each with a work roll 7 and a pressure roll 8. According to one

BATH ORIGINAL

TER MEER · MÜLLER · STEINMEISTER · "" *; Z. * "GUkiToko 3 247 7

essential features of the invention are both in the upper and in the lower roller set, for example in the case of the upper set of rollers with rollers 7 and 8 in FIGS. 2 and 3, two intermediate rollers 6 in parallel arranged between the work roll 7 and the pressure roll 8 with respect to one another. The intermediate rollers 6 are through Support rollers 9 supported. The support rollers 9 are with the help of adjusting mechanisms 91 (Fig. 5), such as Hydraulic cylinders or the like, displaceable in the horizontal direction, as indicated by arrows in Fig. 2 and 3 is indicated.

By adjusting the displacement path of the support rollers 9 the horizontal deflection of the intermediate rollers 6 can be adjusted and thus the degree of deflection of the work roll 7.

The upper and lower work rolls 7 optionally have same diameter, or the diameter of the work roll associated with the intermediate rolls 6, i.e. the upper work roll, is smaller than that of the lower work roll as shown in FIG. The support rollers 9 optionally comprise a single support roller, as shown in FIG. 5, or several support rollers, as shown in FIG. 6.

According to Fig. 6, two support rollers are provided. In this case, each of the support rollers 9 is assigned with the aid of one Adjusting mechanism 91 displaceable. The work rolls 7, the intermediate rolls 6, and the pressure rolls 8 are optionally provided with a conventional roller bending device, not shown.

BATH

TER MEER · MÜLLER · STEINMEISTEft.

thusomcf "3 2 A 7 7 9 8

- 10 -

The pressure roller 8 is advantageously a VC roller (i.e. a roller with adjustable curvature of the type shown in Fig. 1. In Fig, 4, for example, the upper pressure roller 8 is designed as a VC roller, as indicated by the symbol X. The gap or gap 3 of the VC roller is it is a single gap (Fig. 7 (A)) or multiple gaps (Figs. 7 (B) through 7 (D)).

FIGS. 8 (A) to 8 (C) show various exemplary embodiments of the invention, which can be seen through distinguish the type of combination of VC rolls and intermediate rolls. Ideally they are VC roll and the intermediate rolls are provided in both the upper and lower roll sets, as shown in Fig. 8a. But even if these rolls are due to the requirements of the rolling process are only provided for either the lower or the upper set of rollers, the desired ones can still be used Get results. In the embodiment according to FIG. 8b, there is an additional intermediate pressure roller 8 (with non-adjustable! Jölbuna) between the upper pressure roller 8 and the upper intermediate rollers 6 are provided. In the embodiment according to FIG. 8c an additional pressure roll 8 (with a non-adjustable apex) between the work roll 7 and the regular one The pressure roller is provided for that set of rollers which is not provided with intermediate rollers (i.e. in this case, in the lower set of rollers).

During hot rolling, there is a reduction in the

BATH ORIGINAL

TER MEER ■ MÜLLER · STEINMEISTEJfT .V: SU.MITQMQ. "* 3247798

Rolling mill productivity due to the fact that roll abrasion or roll wear leads to scheduling restrictions to lead. To eliminate these planning requirements, it is necessary to determine the local wear and tear of the rollers to limit or avoid. This is achieved according to the invention in that the intermediate rolls 6 are preferably displaceable in the direction of their longitudinal axes, as shown in FIG. Through this the control of the roll deflection is improved at the same time. For example, as shown in FIG. 12, each Work roll 7 or intermediate roll 6 with the aid of suitable adjustment mechanisms such as piston-cylinder arrangements displaceable in opposite directions, as indicated by the arrows in FIG.

15 ..

9 shows an embodiment of a control device to control the shape or profile of the rolled material. In this embodiment a profile detector (and / or a shape sensor) is provided at the output of the rolling device 10 according to the invention. The profile detector and / or shape sensor can optionally also be on the input side of the rolling device or be provided on both sides. The profile detector 11 scans the profile of the rolled material and generates a profile signal which is transmitted to a control unit 12 via a suitable line. the Control unit 12 also receives a signal representative of a setting value and compares these two Signals for generating a correction signal. This correction signal is sent to the individual adjustment mechanisms 91 (Fig. 5) for the support rollers 9 and on

_BA D

TER MEER · MÜLLER · STEINMEISTER. : οyMJlTQMCr -. "-I * - 32 4 7/38

a conventional pressure medium unit 4 (FIG. 1) for the VC roller serving as pressure roller 8. In this way, the horizontal positions and the curvature of the rollers 9, 8 are controlled. Possibly the correction signal is also sent to the roll bending device (not shown) for the work rolls 7 transmitted so that an improved control of the profile is made possible.

FIG. 10 shows an example of a rolling train with the rolling device 10 according to the invention. As in this one Figure can be seen, the inventive design of the rolling device 10 can not be used in all Realize the roll stands of the rolling train. In the embodiment shown, only the first two are Rolling devices 10 designed in the manner according to the invention. Furthermore, the two according to the invention Rolling devices 10, which form the first two roll stands of the rolling train, not necessarily the same structure. Rather, it is the respective structure of the individual rolling devices and roll stands adapted to the respective requirements of the rolling process.

in the following measurement results are to be described, which were achieved with special embodiments of the rolling device according to the invention.

Example I.
30th

(1) Rolling device.
There was a rolling device with the one shown in FIGS

BATH ORIGINAL

TER MEER · MÜLLER · STEINMEISTER. : } .!. SUM ^ TOMQ. 3 2 4 / / JO

was used, but in which the upper and lower work rolls were of the same diameter .

Upper work roll (drive)

Diameter 80 mm, length 460 mm

Lower work roll (drive)

Diameter 80 mm, length 4 60 mm

Upper intermediate rolls (x two)

'Jt ütz rolls (x four)

Upper pressure roller (VC roller)

Diameter 50 now length 4 60 mm

Diameter 120 mm, length 150 mm

Diameter 200 mm Length 4 60 mm Maximum oil pressure 500 kg / cm ² Maximum expansion 0.07 mm / radius

Lower platen

(no VC roller) diameter 200 mm

Length 460 mm

(2) Rolling process:
One aluminum plate with a thickness of 4 mm and one

TER MEER -MÜLLER · STEINMEISTEfS

"SUMrTTONiQ.

- 14 -

Width of 350 now was rolled with a compressive force of 20 t. During the rolling, the internal pressure of the VC roller (upper pressure roller) and the displacement path of the support rollers were regulated.
5

(3) Result:

The thickness distribution of the aluminum plate after rolling is indicated by curve a in FIG. If the displacement path of the support rollers was 1.0 mm larger than the reference value (i.e. if each of the support rollers was 1 mm was shifted inward from its normal position) resulted in a thickness distribution of the rolled aluminum plate corresponding to curve b in FIG. 11. A comparison of curves a and b shows that the advance of the support rollers actually helps to compensate for the deflection of the work rolls.

Example II

A rolling device similar to that of Example I was used. In this case, however, the roll bender was used an additional 2 t load for the work roll. The curve (c) in Fig. 11 shows the thickness distribution the plate after rolling. It can be seen that the deflection of the work roll has been further reduced.

Example III

A rolling device similar to that of Example I was used. In this case, however, the oil pressure was

BATH ORIGINAL

TER MEER · MÜLLER · STEINMEISTER "·; -" SUiytTT ^ MÖ 3 247798

in the VC roller set to the maximum value of 500 kg per cm ² and the expansion of the VC roller corresponded to the maximum value of 70j </ radius. Curve (d) in Fig. 11 shows the thickness distribution of the plate after rolling under these conditions. It can be seen that the deflection of the work rolls was fully compensated and that the central area of the plate became somewhat thinner than the lateral areas of the plate.

Example IV

A rolling machine having the same structure as in Example III was used. In this case, however, _> the upper and lower work rolls were shifted along their axes in opposite directions by 100 mm each. Curve (e) from Fiq. 11 shows the thickness distribution of the aluminum plate after rolling. As this curve shows, in this case the central area of the plate after rolling was considerably thinner than the edges of the plate. This means that the deflection of the work rolls can be compensated to a high degree with the rolling device according to Example IV.

Example V

In a rolling device similar to that of the example I the upper work roll was replaced by an upper work roll with a diameter of only 60 mm. The rolling operation was carried out in the same manner as in Example I. As a result, the

BATH ORIGINAL

TER MEER · MÜLLER. STEINMEISTEPi * - ^: CTtMTfThUh / 32 A 77

the deflection effect caused by the intermediate rolls essentially doubled, while the effect of the VC roller increased by a factor of 1.5.

Example VI

The above Examples I to V show that the rolling apparatus of the present invention provides effective control of the shape and / or the profile of the rolled material. In this example, a cold rolled steel slab was used rolled with a thickness of 0.4 mm and a width of 300 mm with a rolling reduction of about 13%. The used The structure of the rolling device corresponded to Example I. The upper and lower work rolls had 80 mm in diameter, and the intermediate rolls were shifted inwards by 1.0 mm. As a result, the steepness of the steel slab was changed by 4%. If both A VC roller was used in both the upper and lower roller sets, there was a change in the steepness the slab by 1.5%.

Example VII

In a rolling operation similar to Example VI, the upper work roll of the rolling apparatus had a diameter of 60 now and the lower work roll has a diameter of 80 mm. The intermediate rolls were 1.0 mm behind moved inside. As a result, the steepness of the steel slab was changed by 6.5%. When using VC rollers there was a 3% change in slope in the upper and lower sets of rollers.

BATH ORIGINAL

TER MEER · MÜLLER · STEINMEiST.CR, * 1 I SUMITOMO * * 3 Δ Η Ι Ί JQ

.:. Sumitomo.; ..

- 1 7 Example VIII

In a rolling device according to Example VI, a so-called "reduction bending" was carried out during the rolling process. combined with "intermediate roll bending" used. The rolled steel slab received an undesirably diversely deformed uneven profile with a central thickening and wavy edges. This result makes it clear that a combined deflection can be taxed with the help of the rolling device according to the invention.

Example IX

A rolling device according to Example I was used. In this case, however, there were two parallel Intermediate rolls axially displaced in opposite directions. This changed the in Example VIII described shape of the slab in the sense that the undulating unevenness at the edges decreased and the mean elevation increased. This means that the displacement of two intermediate rolls in opposite directions Directions is an effective means of controlling roll deflection.

BATH ORIGINAL

- blank page -

Claims (7)

TER MEER-MULLER STEINMEISTER PATENT LAWYERS - EUROPEAN PATENT ATTORNEYS Dipl.-Chem. Dr. N. tar Meer Dipl.-Ing. H. Steinmeister Dipl.-Ing. FE. Müller Artur-Ladebeck-Strasse 51 Triftstrasse -4, D-8OOO MUNICH 22 D-48OO BIELEFELD 1 S-1-282 (PF) St / Wi / sc Dec 23, 1S82 SUMITOMO METAL INDUSTRIES, LTD. 15 Kitahama 5-chome, Higashi-ku, Osaka-shi, Osaka, Japan ROLLING DEVICE PATENT CLAIMS M., Rolling device with an upper and a lower set of rollers, each comprising a work roll and a pressure roll, characterized by two parallel ones Intermediate rollers (6) between the work roller (7) and the pressure roller (8) of the upper and / or lower roller set, which Intermediate rollers (6) by means of support roller arrangements which can be displaced in the direction of the intermediate roller and away from it are supported. 2. Rolling device according to claim 1, characterized in that that the diameter of the work roll (7) of the set of rolls provided with intermediate rolls (6) is smaller than the diameter TER MEER · MÜLLER ■ STEINMEISTER ";. ^: . '" SüMltOMO ό Ak II OO - 2 of the other work roll is. 3. Rolling device according to claim 1 or 2, characterized in that that the support roller arrangements have several support rollers (9) arranged coaxially next to each other which are displaceable independently of one another with respect to the corresponding intermediate roller (6). 4. Rolling device according to one of the preceding claims, characterized in that at least one the work rolls (7), the intermediate rolls (6) and / or the pressure rolls (8) with a roll bending device is provided. 5. Rolling device according to one of the preceding claims, characterized in that at least one of the pressure rollers (8) is a roller with variable curvature is. 6. Rolling device according to one of the preceding claims, characterized in that the upper and lower work rolls (7) are in opposite directions along their axes Directions are shiftable. 7. Walζvorrichtung according to any one of the preceding claims, characterized in that the two parallel intermediate rollers (6) along their axes in opposite directions Directions are shiftable. BATH ORIGINAL