EP0086934A1 - Method and roll stand for rolling strip of different width - Google Patents

Abstract

When rolling out strip material cross-sections of different widths, the rolling cycle is started with the largest cross-sectional width occurring and completed with the smallest occurring cross-sectional width. To achieve an optimal strip profile in the direction of the cross-sectional width, the defined support length for the work roll bales is set at least approximately to the respective cross-sectional width of the strip material cross section. For this purpose, the bales of the work rolls are reduced in their length regions protruding beyond the respective cross-sectional width by abrasion in their diameter, and are thus exposed on the circumference of the bale against each other and against the bale surfaces of the support rolls.

Description

The invention relates to a method for rolling out strip material of different widths, in which the rolling journey is started with the largest occurring strip width and is completed with the smallest occurring strip width and in which the support length for the work roll bales is set at least approximately to the respective rolled material width. The invention also relates to a roll stand for performing this method.

Both hot rolling and cold rolling of strip material place very high demands on achieving an optimal strip profile and high flatness in the direction of the rolling stock width.

When rolling out strip material by means of conventional roll stands, however, the formation of an optimal strip profile is impaired because the work rolls prevented from deflection by supporting rolls and possibly also intermediate rolls are strongly pressed over the respective width of the strip material, while the length ranges of these work rolls which extend beyond the width of the rolling stock remain free of rolling pressure . In the area that is strongly pressed by the strip material, the work rolls therefore flatten out at their contact with the backup roll or the intermediate roll interception section, during which the length ranges that remain free of rolling pressure are not flattened, but retain their circular cross section. As a result, the work rolls are inevitably bent at their ends towards the roll gap, with the result that the longitudinal edges of the strip material are subject to particularly high loads and are therefore compressed more.

In order to achieve an optimal strip profile, that is, to avoid a stronger rolling out of the strip material in the region of the longitudinal edges, it is known to equip the roll stands with special roll bending devices which prevent the rolling process from bending. Counteract the ends of the work rolls that are not involved against the roll gap. For the same purpose, however, it is also known to use spherically ground work rolls.

However, it has been shown that the use of the roll bending devices does not always allow such a wide spread between the ends of the cooperating work rolls that an optimal belt profile can be ensured. The use of spherically ground rollers also has disadvantages. And not only can their crowning change during longer operating times, but rolls with different crowning must also be used for the rolling of differently wide strip material. In addition to complex warehousing, this also results in frequent roll changes.

In order to improve the flatness of the strip material in the direction of the rolling stock width, that is to say to optimize the strip profile, it belongs to DE-PS 955 131 and. DE-AS 22 06 912 is also part of the prior art. Rolling stands to be used in which the work rolls abut intermediate rolls and these in turn rest against backup rolls and the intermediate rolls are tapered at their ends.

The intermediate rolls are designed on the one hand so that the tapered tapering of their two end sections begins where the longitudinal edges of the strip material to be rolled come to rest on the work rolls. It is also disadvantageous here that different intermediate rolls are required for strip material of different widths, which make expensive storage and frequent roll changes necessary.

On the other hand, it is also part of the prior art to use intermediate rolls, which each have tapered sections at only one end, and the pair of intermediate rolls is built into the roll stand in such a way that its tapered end sections lie on different sides of the stand. By opposing axial displacement of the intermediate rolls, these can be adjusted so that the beginning of their tapered taper comes to rest where a longitudinal edge of the strip material to be rolled runs between the work rolls. A disadvantage of this known type of roll stand is, however, the relatively high technical complexity involved in the axial displacement of the intermediate rolls must be driven. It has also proven to be disadvantageous here that the shifting of the intermediate roll, based on this and the backup roll, leads to an asymmetrical arrangement or unequal length of the bending arms on the work rolls, which can impair the formation of a perfect strip profile. The devices necessary for the work roll shifting also reduce the module of the roll stand, increase the roll wear and also cause a deviation from the conventional rolling technology.

The invention seeks to avoid these disadvantages. It is therefore based on the object of specifying a generic method for rolling out strip material which, with minimal technical effort, ensures the production of optimum strip profiles which are exactly flat and / or exactly in the direction of the rolling stock width.

The solution to this problem is achieved according to the invention according to the characterizing part of claim 1 in the main that the work roll bales in their protruding length ranges beyond the respective rolling stock. By removal on the bale circumference - against each other and also against the adjacent support rollers or intermediate rollers - free will. "Exempt" means an exempting of unloaded rollers.

It has proven to be important for achieving an optimal work result if, according to the invention, the length regions of the work roll bales projecting beyond the respective rolling stock width are released symmetrically to the center of the roll.

In most cases, it turns out to be completely sufficient for the practice of the method if, according to claim 4, the length ranges of the work roll bales projecting beyond the respective rolling stock width are released at least approximately according to the respective roll contour which results under load.

A particular advantage of the type of method according to the invention is further that the length ranges of the work roll bales projecting beyond the respective rolling stock width can be processed in the roll stand. If the processing of the work roll bales is not already carried out during the final phase of a rolling process, it only requires a very short interruption of the rolling process from a larger strip width to be rolled to the next smaller one.

According to claim 6, it is provided according to the invention that the length regions of the work roll bales protruding beyond the respective rolling stock width are turned off, milled off, ground off or are freed up by other suitable methods. It is particularly important according to claim 7 that the length ranges of the work roll bales projecting beyond the respective rolled stock width are reduced in diameter by 0.1 to 1.8 mm, preferably by 0.2 to 1.00 mm.

The type of process according to the invention takes advantage of the fact that in hot strip rolling mills at least twice per working day and in cold strip rolling mills at least two to three times per working shift Work roll change is carried out in all the roll stands, while the removed _A r-beitswalzen in the workshop a reworking of-Bailenflächen takes place. In the removal process carried out by turning, milling or grinding, the roll bales of the work rolls of hot rolling mills are reduced in diameter by 0.5 to 1.0 mm, while a diameter reduction of up to 0.5 mm takes place on the roll bales of the work rolls of cold rolling mills.

Since during a so-called rolling trip of a work roll set, i.e. within the period of time between the installation and removal of the relevant set of work rolls, the rolling out of different strip material widths usually only takes place in descending order, i.e. from a larger to a smaller strip width, the removal processing usually takes place after the end of a rolling trip the rolled bale according to the invention has already been carried out in a certain manner within a rolling journey, namely in such a way that the longitudinal regions thereof projecting beyond the respective rolled material width are exposed to one another and also to the adjacent supporting and / or intermediate rollers. At the end of each rolling trip, only the middle area of the work roll bale that last served to roll out strip material needs to be reworked in the workshop.

It proves to be particularly advantageous that the method according to the invention for rolling out strip material Different widths can be easily exercised using conventional roll stands, because according to the invention it is only necessary to equip such roll stands with removal machining devices, such as turning devices, milling devices, grinding devices or other suitable devices, if necessary.

However, according to the invention, there are also particular advantages if, according to claim 3, the work rolls in the roll stand, which are free at the end of the bale, can additionally be subjected to bending and / or if, according to claim 9, the work rolls in the roll stand can also be subjected to local cooling.

However, the invention is not limited to _: corresponding removal processing on the length regions of the work roll bales protruding beyond the respective rolling stock width. Rather, it can also be used for corresponding removal processing on the roll bales of the support or intermediate rolls interacting with the work rolls.

The process according to the invention for rolling out strip material cross sections and the rolling stand for carrying out this process results in the essential advantage that the production of optimally and / or precisely flat strip profiles in the direction of the rolling stock width can be achieved with minimal technical effort.

This is because it is not only possible to free the length areas of the roll bales that extend beyond the respective cross-sectional width of the strip material cross-section symmetrically to the center of the roll and to make this release at least approximately correspond to the respective roll contour, but the corresponding processing of the roll bales can also be carried out directly in the roll stand and, for example, by twisting , Milling, grinding or by other suitable methods. It is even possible to carry out the free machining of the length regions of the roll bales which protrude beyond the respective cross-sectional width of the strip material cross-section during the rolling process.

A four-roll mill stand, i.e. one with two work rolls and two backup rolls, can easily be used as the roll stand for carrying out the method, while usually (for example according to DE-PS 955 136 and DE-AS 22 06 912) six-roll roll stands Commitment must be brought.

In the case of a four-roll mill stand, removal devices, for example turning devices, milling devices, grinding devices and / or other suitable devices, are assigned at least to the work rolls, on the one hand, in parallel and, on the other hand, transversely to the roll axis in order to carry out this method. In a particularly advantageous manner, a pair of removal devices can be provided according to claim 20 and at the same time against the end regions of the rolled bales on the work rolls.

Due to the machining on the circumference of the bale, the roll bales of the work rolls can be exempted from each other in their length ranges protruding beyond the respective rolling stock width and also against the backup rolls adjacent to them and, if intermediate rolls are present, in such a way that the bales of the unloaded rollers do not touch each other.

The method according to the invention for rolling out strip material cross-sections of different cross-sectional widths and a roll stand for practicing this process, with which the free-standing processing on the bale circumference of the work rolls in the roll stand can be carried out with little technical effort, but also safely and quickly - if necessary also during the rolling operation further educate in other ways.

Technically, it is also possible according to the invention in accordance with the characterizing part of claim 10 that the length regions of the roll bales projecting beyond the different cross-sectional widths of the strip material cross-sections are each processed by different tools in the successive removal length regions.

Here, according to claim 11, the various tools can be successively brought into the working position relative to the roll bale and then moved along this over the respective removal length range. Furthermore, it is provided according to claim 12 that two removal processes are carried out simultaneously from the bale ends facing away from each other with approaching movement on the circumference of the bale.

According to claim 13, it also proves important from a process engineering point of view that the length of movement for each removal length range is limited to the distance between two adjacent tools, because this enables particularly rapid and rapid removal processing of the work roll bales to be achieved.

A roll stand, in particular a four-roll roll stand, for carrying out the method in which at least the work rolls are assigned parallel to the work rolls which can be displaced parallel and on the other hand transversely to the roll axis, is characterized in accordance with claim 26, that for each removal length range of the roll barrel a special tool of a tool - Group sits in a tool holder, which can be moved parallel to the roll axis by the extent of a removal length range, and that the different tools of the tool group can be set individually one after the other with the tool holder in the working position relative to the roll bale. A particularly expedient further development of this roll stand is achieved according to claim 27 in that all tools of the tool group are seated in a common turret, which is held in an adjusting device carried by the roll stands and adjustable in angle about an axis parallel to the roll axis.

• Als empfehlenswert erweist es sich nach Anspruch 29, die Baulänge des Revolverkopfs auf die maximale Bearbeitungslänge des Walzenballens abzustimmen sowie nach Anspruch 30 das Abtragsmaß der Werkzeuge einerseits durch deren Radialstellung im Revolverkopf sowie andererseits durch eine koaxial zum Revolverkopf angeordnete und mit diesem gegen einen Stützbund der Walze anstellbare Tastrolle zu bestimmen.

According to claim 28, it is provided that the tools consist of turning steels inserted into the turret head, so that the machining of the work roll bales is effected by a turning process:

• It is advisable according to claim 29 to match the length of the turret to the maximum machining length of the roll barrel and according to claim 30 the removal of the tools on the one hand by their radial position in the turret and on the other hand by a coaxial to the turret and with this against a support collar of the roller to determine the adjustable feeler roller.

The radial position of the tools in the turret can be made variable by adjusting devices according to claim 31, while according to claim 32 the turret is axially displaceable relative to the feeler roller in the adjusting device by a hydraulic or mechanical feed between two fixed end positions.

A particularly recommendable embodiment of the rolling stand is achieved according to claim 33 in that two turrets with matching tool groups and one roller each sit in mirror image of one another in a common adjusting device and are provided in the same direction rotatable but axially displaceable in opposite directions.

According to claim 34, it also proves important that the individual tools of a tool group with uniform angular distances in the circumferential direction of the Revolver head are arranged distributed, wherein according to claim 35 there is the possibility of arranging several tool groups one behind the other in the circumferential direction of the turret head and to preset each of them to a different removal dimension relative to the feeler roller.

For optimum surface processing of the work roll bales, it is further recommended to assign a coolant and / or lubricant spray device to the or each turret head for the working area of each tool.

Finally, according to claim 37, a design feature of the roll stand according to the invention is also that the adjusting device is provided with a working plane inclined towards the roll plane between the roll stands, preferably on the outlet side of the roll stand in question.

• . Figur 1 in schematisch vereinfachter Prizipdarstellung ein Beispiel für die unter Benutzung ein und desselben Arbeitswalzensatzes während einer Walzreise nacheinander in absteigender Folge auszuwalzenden, unterschiedlichen Bandmaterialbreiten,
• Figur 2 ebenfalls in schematisch vereinfachter Prinzipdarstellung die für die Auswalzung der verschiedenen Bandmaterialbreiten nach Fig. 1 jeweils am Arbeitswalzensatz freizustellenden Endabschnitte des Walzenballens,
• Figur 3 in Walzrichtung gesehen den Walzensatz eines Vierwalzen-Walzgerüst, wobei an den Arbeitswal- zen die im Verlauf einer Walzreise an beiden Endabschnitten des Walzballens vorzunehmenden Abtragungen zur Freistellung des Ballenumfangs ! angedeutet sind,
• Figur 4 den Endabschnitt einer Arbeitswalze, wobei der freigestellte Längenbereich des Walzballens kegelstumpfförmig ausgebildet ist,
• Figur 5 einen Endbereich einer Arbeitswalze, bei der der freigestellte Längenbereich des Walzballens eine Profilgebung hat, die der Kantenentschärfung bzw. dem sogenannten "edge drop" des Bandmaterials entgegenwirkt,
• Figur 6 in schematisch vereinfachter Seitenansicht den Walzensatz eines Vierwalzen-Walzqerüstes mit den Arbeitswalzen zugeordneter Abtragvorrichtung für die freistellende Bearbeitung des Ballenumfangs an den jeweils walzkraftfreien Ballen-Endabschnitten,
• Figur 7 eine Draufsicht auf die Abtragvorrichtung nach Fig. 6,
• Figur 8 eine der Fig. 6 entsprechende Darstellung, jedoch mit abgewandelter Anordnung und Ausbildung, der den Arbeitswalzen zugeordneten Abtragvorrichtung.
• Figur 9 in schematisch vereinfachter Prinzipdarstellung und in Walzrichtung gesehen den Walzensatz eines Vierwalzen-Walzgerüstes, wobei an den Arbeitwalzen die im Verlauf einer Walzreise an beiden Endabschnitten des Walzenballens vorzunehmenden Abtragungen zur Freistellung des Ballenumfanges angedeutet sind,
• Figur 10 in größerem Maßstab und Seitenansicht die obere Hälfte eines Vierwalzen-Walzgerüstes mit den Arbeitswalzen zugeordnete Abtragvorrichtung für die freistellende Bearbeitung des Ballenumfangs an den jeweils walzkraftfreien Ballen-Endabschnitten,
• Figur 11 einen Schnitt entlang der Linie XI-XI in Fig.10,
• Figur 12 wiederum in vergrößertem Maßstab den in Fig. 11 mit XII gekennzeichneten Teilausschnitt und
• Figur 13 eine Ansicht in Pfeilrichtung XIII auf 12 und
• Figur 14 in schematisch vereinfachter Prinzipdarstellung eine Draufsicht auf eine Arbeitswalze aus einem Vierwalzen-Walzgerüst mit zugeordneten Abtragvorrichtungen besonderer Art für die freistellende Bearbeitung des Ballenumfangs an den jeweils walzkraftfreien Ballen-Endabschnitten.

Further features and advantages of the invention are explained in more detail below with reference to exemplary embodiments shown in the drawing. Show here

• . 1 shows, in a schematically simplified basic illustration, an example of the different strip material widths to be rolled out in succession in descending order using one and the same work roll set during a rolling trip,
• Figure 2 also in a schematically simplified schematic representation of each for the rolling of the different strip material widths according to Fig. 1 end sections of the roll barrel to be released on the work roll set,
• Figure 3 seen in the rolling direction, the set of rolls of a four-roll mill stand, with the work rolls being removed on both end sections of the roll bale during the course of a roll travel to clear the bale circumference! are indicated
• FIG. 4 the end section of a work roll, the free length region of the roll bale being frustoconical,
• FIG. 5 shows an end region of a work roll, in which the free length region of the roll bale has a profile which counteracts the edge defusing or the so-called "edge drop" of the strip material,
• FIG. 6 shows a schematically simplified side view of the roll set of a four-roll mill stand with a removal device assigned to the work rolls for the free processing of the bale circumference at the end sections of the bale that are free of rolling force,
• FIG. 7 shows a plan view of the removal device according to FIG. 6,
• 8 shows a representation corresponding to FIG. 6, but with a modified arrangement and design, of the removal device assigned to the work rolls.
• FIG. 9 shows the set of rolls of a four-roll mill stand in a schematically simplified basic illustration and seen in the rolling direction, the removal of the bale circumference to be carried out on both end sections of the roll bale being indicated on the work rolls,
• FIG. 10 on a larger scale and in a side view, the upper half of a four-roll mill stand with the removal device assigned to the work rolls for the free processing of the bale circumference at the end sections of the bale free of rolling force,
• FIG. 11 shows a section along the line XI-XI in FIG. 10,
• FIG. 12, in turn, on an enlarged scale, the partial section marked XII in FIG. 11 and
• Figure 13 is a view in the direction of arrow XIII on 12 and
• FIG. 14 in a schematically simplified schematic representation a top view of a work roll from a four-roll stand with associated removal devices of a special kind for the free processing of the bale circumference at the end sections of the bale free of rolling force.

In Fig. 1 of the drawing, a larger number, e.g. five different strip material cross-sections 1, are indicated in a purely schematic representation, which essentially differ only in that they have different cross-sectional widths 1.1 - 1.2 - 1.3 - 1.4 - 1.5.

Each of these different strip material cross-sections 1 is to be rolled out in a rolling mill system to achieve a strip profile with precise flatness in the direction of the respective cross-sectional width 1.1 - .... - 1.5. It is possible to produce the strip material cross sections 1 with a relatively large thickness by hot rolling; however, cold rolling of strip material cross sections 1 of relatively small thickness is also provided.

The rolling out of all of the strip material cross sections 1 of different cross-sectional widths 1.1 - .... - 1.5, which are only indicated in FIG. 1, should, if possible, use one and the same set of work rolls in the rolling mill system. without changing the work roll during one and the same rolling cycle.

The respective rolling cycle is done with the thickest and widest strip material cross-section 1, e.g. started with the cross-sectional width 1.1 and continued so that the thinnest and narrowest strip material cross-section l, that is to say, for example, the one with the cross-sectional width 1.5 is finally rolled out.

The rolling out of strip material cross sections 1 with a precisely flat strip profile in the direction of the rolling stock width cannot be carried out using only a work roll set 2 consisting of two co-operating work rolls 2 'and 2 ", but it presupposes that each work roll 2' and 2" at least with a support roller 3 'and 3 "of a support roller set 3, as indicated in Fig. 3. The rolling must therefore be carried out at least using a four-roll stand.

So-called multi-roll mill stands are already in use for such rolling operations, and these are designed in such a way that the work rolls interact with the backup rolls by assigning additional intermediate rolls.

3 as well as in the multi-roll stands with additional intermediate rolls, the work rolls 2 'and 2 "which are prevented from bending are strongly pressed over the cross-sectional width' 1.1 - .... - 1.5 of the strip material cross-section 1 to be rolled out, whereby they flatten in these areas on their circumferential portion which is supported on the support roller 3 'or 3 "or else on the intermediate roller. On the other hand, the length ranges of the work rolls 2 'and 2 "projecting beyond the respective cross-sectional width 1.1 .... - 1.5 are free of rolling pressure, so that they are not flattened and thus retain their circular cross-section. However, this causes the work rolls 2' and 2" in each case bent towards the roll gap 4 at their ends.

This peculiar behavior of the work rolls 2 'and 2 "must be countered, however, if a strip profile which is exactly flat in the direction of the rolling stock width is to be achieved and edge defusing, ie the formation of so-called" edge drops ", is to be prevented thereon.

In Fig. 2 - based on the different cross-sectional widths 1.1 - .... -1.5 of the strip material cross-sections according to Fig. 1 - the method of rolling out strip material of different widths is indicated purely schematically, with which the adjustment of the effective bale width of the work rolls 2 'and 2 "to the respective cross-sectional width 1.1 - .... -1.5 of the strip material cross-section 1 can be brought about.

This type of process takes advantage of the fact that each work roll set 2 is changed after the end of the rolling cycle and the roll balls 5 'and 5 "of the individual work rolls 2' and 2" are removed mechanically, for example by turning, milling, grinding or other suitable processes their diameter should preferably be reduced between 0.2 and 1.0 mm before the work roll set 2 in question is reinstalled in the roll stand for the next rolling trip.

2a) shows the work roll set 2 with the two work rolls 2 'and 2 "as it comes into the roll stand for installation when the roll is changed. The roll balls 5' and 5" of the two work rolls 2 'and 2 "are for the rolling out of a strip material cross section 1 designed according to FIG. La), which has the largest cross-sectional width 1.1. It can be seen from Fig. 2a) that the length 5.1 of the roll bales 5 ¹ and 5 "on the work rolls 2 'and 2" is approximately equal to the largest occurring cross-sectional width 1.1 of the strip material cross-section 1 according to Fig. La), so that the roll bales 5 'and 5 "have practically no rolling pressure-free end areas which could cause the roll ends to bend in the direction toward the roll gap 4.

2b shows the work roll set 2 with its two work rolls 2 'and 2 "in association with a strip material cross section 1 according to FIG. 1b) which has the cross-sectional width 1.2. It can be seen that the roll bales 5' and 5" with their maximum bale length 5.1 according to FIG. 2a) protrude at both ends by a considerable amount beyond the longitudinal edges of the strip material cross section 1 with the cross section width 1.2.

Since these length regions of the roll bales 5 ′ and 5 ″ projecting beyond the strip edges would remain free of rolling pressure when rolling out the strip material cross-section 1 with the cross-sectional width 1.2, they could cause an undesired bending of the roll ends into the roll gap 4 and thus an uneven strip profile of the strip material cross-section 1 and also cause unwanted edge defusing, "edge drops", on the strip material cross section 1.

To prevent these disadvantageous and highly undesirable consequences, therefore, on the roll bales 5 'and 5 "of both work rolls 2' and 2" of the work roll set 2 during the rolling trip, that is, in the roll stand with the work roll set 2, at both ends a mechanical removal process is carried out on the circumference of the bale. This removal process can be effected by turning, milling, grinding, but also by other suitable methods in such a way that the length ranges of the roll bales 5 ′ and 5 ″ projecting beyond the cross-sectional width 1.2 of the strip material cross section 1 are reduced in diameter by an amount which is at least 0.1 The effective ball length is brought to the dimension 5.2 according to FIG. 2b), while at the same time the end areas of the roll balls 5 'and 5 "of both work rolls 2' and 2" of the work roll set 2 are each on the length area 6.2 against each other and also against the bales of the adjacent support rollers 3 'and 3 "of the support roller set 3.

As indicated in FIGS. 2c) and 2d) and 2e), the same processes are repeated for the rolling out of the strip material cross-sections 1 in the cross-sectional areas 1.3, 1.4 and 1.5 according to FIGS. 1c), 1d) and le).

According to Fig. 2c), the effective length of the rolled bales 5 'and 5 "of the work roll set must be brought to the dimension 5.3, i.e. it is necessary to cut both end of the bale to the dimension 6.3.

According to FIG. 2), the roll bales 5 'and 5 "of the' work roll set 2 have the dimension 5.4, which means that it is necessary to free both bale ends by the dimension 6.4.

Finally, in Fig. 2e) the effective length 5.5 for the roll bales 5 'and 5 "is indicated, whereby both bale ends of the roll bales 5' and 5" of the work roll set 2 by the dimension 6.5. must be exempted.

4 and 5 of the drawing indicate two different possibilities for the formation of the bale ends to be released on the work rolls 2 'or 2 ". According to FIG. 4, the released end region 6.4 for the roll bales 5' and 5" of the work rolls 2 'and 2 "a profile which counteracts an edge defusing or the formation of edge drops on the strip material cross-sections 1.

5, on the other hand, shows a shape of the released end region 6.2 on the roll bales 5 ', 5 "of the work rolls 2', 2", which approximately corresponds to the roll contour under load for the cross-sectional width of the strip material cross section to be rolled out.

In both cases, i.e. both in the example according to FIG. 4 and in the example according to FIG. 5, the circumference of the bale in the length regions of the roll bales 5 ′ and 5 ″ projecting beyond the respective rolling stock width is released by the removal in a conically tapering shape towards the end of the bale.

According to FIG. 4, the conically free end section 6.4 of the roll bales 5 ′, 5 ″ of the work roll set 2 begins to avoid edge defusing or. of "edge drops" with a relatively small distance within the longitudinal edges of the cross-sectional width of the strip material cross-section to be rolled out in each case 1.-That is, the effective bale length 5.1 - ... - 5.5 of the roll bales 5 ', 5 "of the work roll set 2 is slightly smaller than the cross-sectional width to be rolled out 1.1.- ... - 1.5 of the strip material cross-section 1.

In contrast to this, the tapered bale end 6.2 according to FIG. 5 begins to a small extent outside the cross-sectional width of the strip material cross section 1 to be rolled out. Here is the effective length 5.1 -... - 5.5 of the roll bales 5 'and 5 "of the work roll set 2 dimensioned somewhat larger than the respective cross-sectional width 1.1 - .... - 1.5 of the strip material cross-section 1 to be rolled out.

Since the extent of the material removal to be made free of the bale ends on the circumference of the roll bales 5 'and 5 "of each work roll 2' and 2" in any case within the predetermined dimensions for the reworking of the roll bales 5 'and 5 "of the work roll set 2 after the end of a rolling trip lies, when practicing the type of process according to the invention after the end of each rolling trip of the work roll set 2 in the workshop practically only that length range of the roll bales 5 'and 5 "needs to be reworked, which was not yet affected by the free machining operation during the rolling trip.

If necessary, it is also conceivable to leave the work roll set 2 in the roll stand and there before loading at the beginning of the next rolling trip to complete the reworking of the 5 'and 5 "rolls.

Particularly when carrying out the method according to the invention for the cold rolling of strip material cross-sections 1, it is essential that the chips, dusts or the like which arise during the carrying out of the removal process are sucked off safely so that they do not get onto the bale surfaces which respectively carry out the rolling process, but also on the other hand cannot contaminate the rolling emulsion.

It should also be pointed out that it is particularly expedient to isolate the length regions of the roll bales 5 'and 5 "projecting beyond the respective cross-sectional width of the strip material cross-section symmetrically to the center of the roll. This ensures in any case that the work rolls 2' and 2" of the Work roll set 2 flex arm arms of equal length come into effect. The flatness of the strip material cross-section 1 in the direction of its cross-sectional width can hereby be influenced particularly favorably.

The impulse for the free machining of the length regions of the roll bales 5 ′ and 5 ″ projecting beyond the respective cross-sectional width of the strip material cross section 1 in the rolling can be derived, for example, from the respective position of the respective work roll bending device.

But it can also be produced by means of suitable measuring devices, such as the center distances between the ares determine and compare beitswalzen and the backup rolls on the one hand in the areas in engagement with the rolling stock and on the other hand in the areas not in engagement with it. The resulting difference measure then triggers the impulse for the free machining at the ends of the work roll bales.

6 and 7 show a possible design for a device which enables mechanical material removal on the circumference of the roll bales 5 'and 5 "of the work rolls 2' and 2" of the work roll set 2 in the region of both bale ends.

In this case, for example, on the inlet side of the roll stand, preferably on both sides 7 'and 7 "of the strip inlet guide 7, feed devices 8 and 8', 8" are mounted, which carry the removal devices 9 and 9 ', 9 " the feed devices 8 and 8 ', 8 ", the removal devices 9 and 9', 9" symmetrical to the rolling line and at the same time on the ends of the roll balls 5 'and 5 "of both work rolls 2' and 2" can be brought into effect and on the extent of which material is removed in the necessary order. The feed devices 8 or 8 ', 8 "and thus also the removal devices 9 or 9', 9" are carried by the tape inlet guide 7 or 7 ', 7 " that they can be easily and safely depending on the cross-sectional width 1.1 - .... - 1.5 of the strip material cross-section 1 to be rolled on the length range of the roll bales 5 'and 5 "of both work rolls 2' and 2" to be subjected to the removal processing. of the work roll set.

In Fig. 8 only the upper back-up roll 3 'and the upper work roll 2' of a four-roll stand are shown. However, it can be seen here that the removal processing to be carried out on both work rolls to release the end areas of the roll bales free of rolling pressure, e.g. by means of grinding units 10, which are assigned to each work roll 2 'or 2 "in pairs in a similar manner, as is indicated in FIG. 7 for the removal devices 9 or 9', 9". The setting of the grinding unit pairs 10 in the direction of the roller axis can be carried out via an adjusting spindle 11 depending on the cross-sectional width 1.1 - .... - 1.5 of the strip material cross-section 1 to be rolled out, so that the removal processing at the ends of the roll bales 5 'and 5 "the work rolls 2 'and 2" takes place symmetrically to the center of the roll. The grinding unit pairs 10 are guided on a traverse 12 which is fastened to guide grooves 13 which are rotatably mounted in the stands and are concentric with the support roller axis. By rotating the guide rings 13 by means of the actuating cylinder 14, the pairs of grinding units can be adjusted against the circumference of the roll bales 5 'and 5 "of the work rolls 2' and 2" by the amount necessary.

So that the grinding dust that inevitably arises during the removal process does not affect the. bale surfaces of the work rolls 2 'and 2 "located in the rolling engagement and also cannot contaminate the rolling emulsion, on the one hand, in the area of the grinding unit pairs 10 with the circumference of the bale, a stripping device 15 and, on the other hand, a strong suction device 16 work together, as shown in FIG is indicated.

The effects of an adjustment of the effective length 5.1 - .... - 5.5 of the roll bales 5 'and 5 "of the work roll set 2 to the respective cross-sectional width ll - .... - 1.5 of the strip material cross-section 1 to be rolled out and thus the adjustment of the contact width between the work rolls 2 'and 2 "and the support rolls 3', 3" were examined on a four-roll mill stand for a hot wide strip mill in which the support rolls had a diameter of 1,600 mm and a bale length of 2,240 mm, and the work rolls a diameter of 735 mm and a bale length of 2,240 mm.

Results were compared in which the contact width between the back-up rolls and the work rolls corresponded to the bale length (2,240 mm) and the contact width resulted from the respective width plus 2 x 50 mm. The bandwidth range examined ranged from 700 mm to 2080 mm.

It was found that by reducing the contact width between the support and work rolls, a significant reduction in the deviations of the rolled profile from the rectangle can be achieved without any other measure.

It was also found that with a full contact width between the work rolls and the backup rolls, the work roll bend quickly loses effect with a decreasing bandwidth, while it is also effective with a reduced contact width even with medium and narrow belts.

It was also found that with a contact width matched to the respective bandwidth between the support rollers and the work rollers for the entire width range, not only a substantially smaller but also a crowning that is almost independent of the bandwidth is sufficient to achieve a constant roll gap profile. If you were to work with a fixed crown, which was constant for all bandwidths, with full contact width, then considerable bending and counter-bending forces would be required to set a constant rolling profile for all widths. With a reduced contact width, on the other hand, much smaller corrections can be made by bending and counter-bending the work rolls.

Since changes in the roll gap profile also result from changes in the rolling force, considerable improvements can be achieved by adapting the contact width between the backup rolls and work rolls to the respective strip width.

When the contact width between the back-up rolls and the work rolls is matched to the respective strip width (medium and narrow strip widths), the roll gap does not even react half as strongly to fluctuations in rolling force as with the full contact width between the support rolls and the work rolls.

To correct the roll gap profile, very small bending forces are sufficient even with very narrow strip widths. With an adapted contact width, the bending forces required to correct the roll gap profile can be reduced to Reduce 1/7 of the bending forces required for the full contact width.

If the adjustment of the contact width between back-up rolls and work rolls does not take place immediately before a change in width, i.e. if the contact width is initially larger than intended, then this has no harmful consequences for the roll gap profile, provided the extent of the circumferential erosion does not differ by more than 50 to 100 mm lagging behind the range.

• - dem mechanisch aufgebrachten Walzenschliff,
• - der thermischen Balligkeit aufgrund von Temperaturunterschieden zwischen Ballenmitte und Ballenenden und
• - dem Verschleißprofil.

The effective crown of a work roll is mainly composed of three sizes, namely

• - the mechanically applied roller grinding,
• - The thermal crowning due to temperature differences between the center and end of the bale and
• - the wear profile.

During hot rolling, the temperature expansions of the rolls can become so great that only a small part of the crowning has to be ground.

To reduce the roll gap elevation, it is neither necessary to remove the bale circumference up to the strip edges, nor must the removal dimension be so large that there is complete relief between the support and work rolls. Both parameters can be used to choose the size of the desired effect. For the rolling out of strip material cross sections 21 with a strip profile that is exactly flat in the direction of the rolling stock width, at least one four-roll mill stand must be used arrive, as is shown schematically in Fig. 1. It has a work roll set 22 consisting of two cooperating work rolls 22 'and 22 "and a support roll set 23 consisting of two support rolls 23' and 23".

So-called multi-roll stands have already been used for such rolls, these being designed so that the work rolls 22 'and 22 "interact with the support rolls 23' and 23" by assigning additional intermediate rolls.

1 and the multi-roll stands with additional intermediate rolls, the work rolls 22 'and 22 "which are prevented from bending are strongly pressed over the respective cross-sectional width 26 of the strip material cross-section 21 to be rolled out, as a result of which they are in these areas flatten on their circumferential section supporting on the support roller 23 'or 23 "or on the intermediate roller. On the other hand, the length regions of the work rolls 22 'and 22 "projecting beyond the respective cross-sectional width 26 are free of rolling pressure, so that they are not flattened and thus retain their circular cross-section. However, this causes the work rolls 22' and 22" at their ends 27 against the Roll gap 24 bent out.

This peculiar behavior of the work rolls 22 'and 22 "must, however, be countered if a strip profile which is exactly flat in the direction of the cross-sectional width 26 of the strip material cross section 21 achieves and an edge ent sharpening, ie the formation of so-called "edge drops", to be prevented at this. It must, therefore, an adjustment of the effective width of ball 27 are brought to the 'work rolls 22' and 22 _'' cutting width to the respective transverse strip material 26 of the cross-section of the 21st

It can be assumed that each work roll set 22 is changed after the end of the rolling journey and roll bales 25 'and 25 "of the individual work rolls 22' and 22" by a mechanical removal process, for example by turning, milling, grinding or other suitable processes, in their diameter , preferably between 0.2 and 1.0 mm, reduced. are before the relevant work roll set 22 is reinstalled in the roll stand for the next rolling trip.

In Fig. 1, fully drawn lines indicate the work roll set 22 with the two work rolls 22 'and 22 "as it is used when changing the roll in the roll stand. The roll balls 25' and 25" of the two work rolls 22 'and 22 "for the rolling out of a strip material cross section 21 with the largest possible cross-sectional width 26. Since the length 27 of the roll bales 25 'and 25" on the work rolls 22' and 22 "is approximately equal to the largest cross-sectional width 26 of the strip material cross section 21, the roll bales have 25 'and 25 "practically no rolling pressure-free end areas which could cause the roll ends to bend in the direction toward the roll gap 24.

However, if a strip material cross-section 21 is rolled out, which has a smaller cross-sectional width 26, as is indicated in FIG. 1, then the roll bales `25 'and 25" with their maximum bale length 27 protrude on both ends by a considerable amount beyond the longitudinal edges of the strip material cross-section 21 .

However, since these length regions of the roll bales 25 ′ and 25 ″ projecting beyond the strip edges would remain free of rolling pressure when the strip material cross section 21 shown in FIG. 1 is rolled out, they could cause an undesirable bending of the roll ends into the roll gap 24 and thus an uneven strip profile of the strip material cross section 21 as well as undesirable edge defusing (edge drops) on the strip material cross section 21.

To prevent these disadvantageous and highly undesirable consequences, therefore, on the roll bales 25 'and 25 "of both work rolls 22' and 22" of the work roll set 2 during the rolling trip, that is to say with the work roll set 22 remaining in the roll stand, an, for example, mechanically reliable, removal process on Bale circumference performed. This removal process can be effected by turning, milling, grinding or also by other suitable methods in such a way that the length regions 28 of the roll bales 25 ′ and 25 ″ projecting beyond the cross-sectional width 26 of the strip material cross section 21 are reduced in diameter by an amount which is at least O, 1 and at most 1.8 mm, as indicated by the broken line in Fig. 1. The effective bale length 27 is thereby reduced to one of the Cross-sectional width 26 of the strip material cross-section 21 brought an approximate dimension, while at the same time the end regions of the roll bales 25 'and 25 "of both work rolls' 22 'and 22" of the work roll set 2 each - on the length region 28 against one another and also against the bales of the adjacent support rolls 23' and 23 "of the backup roller set 23 are exempted, as indicated by the broken lines in FIG. 1.

Such removal processes on the circumference of the roll bales 25 'and 25 "of both work rolls 22' and 22" of the work roll set 22 are repeated several times during each rolling trip, i.e. they are strung together depending on the respective cross-sectional width 26 of the different strip material widths to be rolled out in descending order.

Since the removal processing of the roll bales 25 'and 25 "of both work rolls 22' and 22" of the work roll set 22 takes place in the roll stand before the rolling out of the next strip material cross-section 21 of any cross-sectional width begins, it is important that the removal process be carried out quickly and with as little technical effort as possible quickly as well as the precision required for an optimal rolling result. To achieve this, the roll stand according to FIG. 1 is preferably assigned a device for each work roll 22 'and 22 "of the work roll set 22 which enables mechanical material removal on the circumference of the roll bales 25' and 25" in the region of both bale ends.

The basic structure of this device is shown in FIGS. 2 and 3 of the drawing with reference to the upper work roll 25 '. The device assigned to the lower work roll 25 "is basically constructed and arranged in the same way, but is not shown for the sake of simplicity.

From FIGS. 2 and 3 it can be seen that the two stands 30 'and 30 "of the rolling stand have inclined guides 31' and 31" on their mutually facing inner sides, in or on which a transverse yoke 32 is held, which is driven by a drive 33 , for example. Hydraulic cylinder, can be adjusted relative to the work roll 22 '. On the transverse yoke 32, a cross member 35 is in turn held by guides 34 'and 34 ", which has two outer bearing blocks 35' and 35" and a central bearing block 35 '".

A tool carrier 36 'is arranged in the cross member 35 on the one hand between the outer bearing block 35' and the middle bearing block 35 '", while on the other hand a second tool carrier 36''is seated between the outer bearing block 35' and the middle bearing block 35". The two tool carriers 36 'and 36 "are arranged and formed as a mirror image of one another and are designed as turret heads which are held in the crossmember 35 so as to be rotatable about an axis 37-37 running parallel to the roller axis, for example in angular steps of 15 °. Qußerdem each of the two tool carriers 36 'and 36 ^"g by a hydraulic or mechanical feed drive yet by a predetermined We 38' and 38 'back in the direction of the axis of 37-37 and forth is provided in the traverse 35th

Both tool carriers 36 'and 36 ", designed as turrets, can be rotated synchronously, for example by means of a common shaft 39, and thus in each case by the same angular increments and, on the other hand, are rotated in opposite directions on this shaft 39 by the dimension 38' or, respectively, via the hydraulic or mechanical feed drive. 38 "back and forth.

Each tool carrier 36 'and 36 "designed as a turret is equipped with a large number of similar tools 40, for example with turning tools, in such a way that they are not only at a corresponding distance 41 from one another in the direction of the axis 37-37, but rather also in The circumferential direction is offset from one another by matching angular distances 42. The angular distances 42 between two successive tools 40, for example turning steels, correspond to the respective rotation angle steps of the tool carriers 36 'and 36 "designed as turrets around the axis 37-37 or an integral multiple thereof.

If each tool holder 36 'or 36 "is equipped with a corresponding number of tool holders, in particular turning tool holders, it can be equipped with several, for example three or four, tool groups connected in series, each of which has the same number, for example contains six or eight tools.

The overall length of the tool carriers 36 'and 36 "is selected so that with each tool group located on them the greatest possible machining length 28 on each End of the roll barrel 25 'can be controlled. The distance 41 between successive tools 40 of each tool group is selected so that their working areas at least slightly overlap at the beginning and at the _' end of the available feed path 38' or 38 "for the tool carrier 36 'or 36".

If one assumes, for example, that each tool group provided on the tool carrier 36 'or 36 "designed as a turret head comprises six turning tools as tools 40, the distance between which is 41 mm 110 mm and that the feed path 38' or 38" for If the tool carrier is set to 120 mm in the direction of the axis 37-37, then both ends of the roll barrel 25 'of a work roll over a length 28 of at least 660 mm can be subjected to a removal process in six successive processing steps, by successively all tools combined in a tool group 40 are placed in the working position by corresponding angular rotations of the tool carriers 36 'and 36 "relative to the roll barrel 25' and then the feed path 38 'or 38" is traversed with the tool carrier 36' or 36 ".

The effective length of each tool carrier 36 ′ and 36 ″ designed as a turret head can thus be dimensioned shorter by the available feed path 38 ′ or 38 ″ than the maximum length of the end region 28 of the roll barrel 25 ′ to be subjected to removal machining.

So that the same chip thickness is always ensured during the machining of the roll barrel 25 'by tools 40, for example turning steels, which are brought into operative position one after the other, the radial .sc. Distance between all tools 40 of the same tool group to the axis 37-37, for example with a template, exactly adjusted to the same dimension. The adjustment is in each case coordinated with a feeler roller 43 'or 43 ", which is mounted coaxially to the tool carrier 36' or 36", but freely rotatable and axially immovable on the shaft 39.

This feeler roller 43 'or 43 "interacts with a collar 44' and 44" of a predetermined diameter formed on the roll neck next to the end of the roll barrel 25 'of the work roll 22' and thereby determines the machining of the roll barrel 25 'by the tools 40 chip thickness generated. When machining, it is therefore only necessary to move the tool carrier 36 'and 36 "against the work roll 22' by means of the transverse yoke 32 which can be displaced between the stands 30 'and 30" by the drive device 33 and the crossbar 35 attached thereto so that the two Tracer rollers 43 'and 43 "with the collars 44' and 44" of the work roll 22 'come into contact. With each subsequent operation for the machining of the roll bale 25 'of the work roll 22', exactly the preset web thickness and thus also the diameter reduction of the roll bale 25 'is then exactly adhered to in a simple manner.

It should also be mentioned that the guides 34 'and 34 "between the transverse yoke 32 and the cross member 35 run essentially perpendicularly, that is to say parallel to the common axial plane of the roller sets 22 and 23, and _' serve to serve the working plane of the tool carriers 36 'and 36" to set different diameters of the work roll 22 'or 22 "in such a way that it cuts the roll axis exactly in each case. In this way it is achieved that with every occurring bale diameter of the work roll 22' and 22" an exact stock removal at the ends of the Roll balls 25 'and 25 "is ensured.

The hydraulic or mechanical feed drive for the opposite axial displacement of the two tool carriers 36 'and 36 "on the common shaft 39 can be provided within this shaft 39 and is therefore not shown in FIG. 3. The rotary drive for the shaft 39 for the common angular step Adjustment of the two tool carriers 36 'and 36 "can be provided within the central bearing block 35'". The cutout marked IV in FIG. 3 can be seen on a larger scale in FIG. 4. It can be seen that the feeler roller 43 'by means of a Rolling bearing 45 is freely rotatable but axially immovable on the shaft 39, which in turn holds the tool carrier 36 'designed as a turret.

In the section of the tool carrier 36 'shown in FIG. 5, two turning tools 40' and 40 "are provided as tools one after the other at a distance 41, whereby FIG. 5 shows that these two turning tools 40; and 40" at the same time by the angle 42 of e.g. 15 ° in circumference Direction of the tool carrier 36 'are arranged offset, so that they can be brought relative to the roll barrel 25' by an angular rotation of the tool carrier 36 'of 15 ° in succession in the working position.

In FIG. 4, the position of the turning tool 40 "shown in FIG. 5 is indicated by solid lines, while the dashed lines represent its working position after an angular rotation of the tool carrier 36 'of 15 ° clockwise.

From Fig. 2 it can still be seen that each tool carrier 36 'or 36 ", preferably for the working area of each tool 40, can be assigned a coolant and / or lubricant spraying device 46, so that an optimal surface condition of the roll balls 25' and 25" in Area of machining is achieved. But it is also possible to provide compressed air nozzle units 47 at this point; as indicated in Fig. 4. These compressed air nozzle assemblies 47 are arranged and designed such that they blow the chips that arise during the removal machining away from the area of the roll bales 25 'so that they do not get into the area of the roll gap. This mode of action is still advantageous supports that below the _B earbeitungszone a shield plate is pivotally suspended 48, 49 is pivotable with the aid of a pressure cylinder and can be applied with its front end so against the roll barrel that a falling of chips in the area of the Roll gap is not possible.

In Fig. 14 of the drawing, in a purely basic illustration, a further possibility for carrying out a mechanical removal process on the bale circumference of the work rolls in a four-roll mill stand is indicated.

If it is assumed that the maximum length 57 of the roll barrel 55 of the work rolls 52 of a four-roll mill stand is longer than the cross-sectional width 56 of the strip material cross section 51 to be rolled out, then the length regions 58 of the roll barrel 55 projecting beyond the strip edges remain free of rolling pressure. Therefore, they can cause an undesired bending of the roll ends into the roller gap and, consequently, an uneven in the transverse direction of the strip profile strip material cross-section 51 as well as unwanted edge defusing, "edge drops" generate, _"on band material cross section 51st

To prevent these disadvantageous and highly undesirable consequences, however, on the roll bales 55 of the two cooperating work rolls 52 of a four-roll mill stand during the rolling cycle, i.e. H. with the work roll set remaining in the roll stand, a removal process was carried out on both sides of the bale circumference.

This removal process is effected according to FIG. 14 through the use of laser devices 59 'and 59 ", in such a way that the length regions 58 of the roll bales 55 which extend beyond the cross-sectional width 56 of the strip material cross section 51 are reduced in diameter by an amount which is at least 0.1 and at most 1.8 mm. As a result, the effective bale length is reduced to the dimension 56 compared to the original bale length 57, while at the same time the end regions 58 of the roll bales 55 on the work rolls 52 are released against each other and also against the bales of adjacent support rolls.

The laser devices 59 'and 59 "used for the removal processing are assigned to the four-roll stand so that their laser beam 60' or 60" hits the outer surface of the roll barrel 55 in such a way that it lies on a plane running through the roll axis. The spatial position of the laser devices 59 'and 59 "relative to the work roll 52 subjected to the removal process is of secondary importance, as long as the effective plane of the laser beams 60' and 60" lies on a plane running through the axis of the roll concerned and consequently perpendicular to one the tangent of the bale strikes the outer surface of the roll barrel 55.

The laser beams 60 'and 60 "are brought to bear on the circumference of the roll barrel 55 during the rotational movement of the work rolls and at the same time the laser devices 59' and 59" are moved parallel to the roll axis in the direction of arrows 61 'and 61 " respective roller speed and / or the desired or required roller contour, the depth of ablation at the circumference of the bale is determined by energy regulation of the laser beams 60 'and 60 ". Practically useful results are achieved when laser devices 59' and 59" are used which provide energy regulation at least within the Enable power range between 5 and 12 kW.

If, on the other hand, laser devices 59 ', 59 "are used which do not permit energy regulation within larger limits, there is also the possibility of achieving the desired ablation depth at the length regions 58 of the roller barrel 55 to be left free by the fact that there the same track lines are repeated several times in succession with the Laser beams 60 'and 60 "are run over. The number of the track line crossing to be carried out is then essentially determined by the respective roller contour.

In order to obtain a coherent ablation surface on the length region 58 of the roll barrel 55 which is free in each case, a sensitive energy regulation of the laser beams 60 'and 60 "is desirable and also a sensitive control of the transverse displacement for the laser devices 59' and 59" in the direction of the arrow 61 'and 61 " to provide.

The removal machining on the lateral surfaces of the bales 55 of work rolls 52 by laser beams 60 'and 60 "is only provided for the length regions 58 not involved in the rolling process, the surface quality of which does not have to meet the quality requirements as they are are to be placed on the surface areas 56 of the roll bales 55 which carry out the rolling work.

'After completion of a rolling trip and before the start of the next rolling trip, it is therefore provided that the bales 55 of a work roll 52 treated by laser machining are reground in order to create completely smooth surfaces and in particular to remove ledeburitic microstructures in the boundary layer which are caused by the heat of the laser with subsequent abrupt cooling due to the removal of heat from the base material. The ledeburitic boundary layers are very hard and brittle and must therefore be removed by grinding before the rollers can be used again.

Claims (40)

l. Method for rolling out strip material cross-sections of different cross-sectional width, in which the rolling cycle is started with the largest cross-sectional width occurring and completed with the smallest occurring cross-sectional width, and in which the support length for the bales of the work rolls is set at least approximately to the respective cross-sectional width of the strip material cross-sections, characterized in that that the bales (5 ', 5 ") of the work rolls (2', 2") are released in their length ranges (6.2 - ... - 6.5) projecting beyond the respective cross-sectional width (1.1 - ... - 6.5) by removing them from the circumference of the bale be (Fig. 2, 4 and 5). ' 2. The method according to claim 1,
characterized,
that the length ranges (6.2- .... - 6.5) of the roll bales (5 ', 5 ") projecting beyond the respective cross-sectional width (1.1 - .... - 1.5) of the strip material cross-section (1) are released symmetrically to the center of the roll (Fig. 2). 3. The method according to claim 1 or 2,
characterized,
that the work rolls (2 ', 2 ") which are free at the end of the bale are additionally subjected to a bend. 4.The method according to one of claims 1 to 3,
characterized,
that the length ranges (6.2 - ....- 6.5) of the roll bales (5 ', 5 ") projecting beyond the respective cross-sectional width (1.1 - ... - 1.5) of the strip material cross-section (1) are at least approximately free according to the respective roll contour ( Fig. 4). 5. The method according to any one of claims 1, 2 and 4,
characterized,
that the length ranges (6.2 - ... - 6.5) of the roll bales (5 ', 5 ") projecting beyond the respective cross-sectional width (1.1 - ... - 1.5) of the strip material cross-section (1) are processed in the roll stand (FIGS. 6 to 8 ). 6. The method according to any one of claims 1, 2, 4 and 5,
characterized,
that over the respective cross-sectional width (1.1 - .... - 1.5) of the strip material cross-section (1) protruding length ranges (6.2 - .... -6.5) of the roll barrel 5 ', 5 ") are turned, milled, ground or by other suitable methods be exempted. 7. The method according to any one of claims 1, 2 and 4 to 6,
characterized,
that over the respective cross-sectional width (1.1 - .... - 1.5) of the strip material cross-section (1) projecting length ranges (6.2 - .... -6.5) of the roll bales (5 ', 5 "in diameter by 0.1 to 1, 8 mm, preferably reduced by 0.2 to 1.0 mm. 8. The method according to any one of claims 1, 2 and 4 to 4,
characterized,
that the length ranges (6.2 - ..... - 6.5) of the roll bales (5 ', - 5 ") projecting beyond the respective cross-sectional width (1.1 - .... - 1.5) of the strip material cross-section (1) are processed during the rolling process. 9. The method according to any one of claims 1 to 8,
characterized,
that the exempted work rolls (2 ', 2 ") are additionally subjected to local cooling. 10. Process for rolling out strip material cross sections. Different cross-sectional widths, at which the roller travel begins with the largest cross-sectional width occurring and ends with the smallest occurring cross-sectional width, and at which the support length for the bales of the work rolls is set at least approximately to the respective cross-sectional width of the strip material cross sections, according to claim 1, the bales of the work rolls are released in their length ranges that extend beyond the respective cross-sectional width by removing them from the circumference of the bale,
characterized,
that the length regions (28) of the roll bales (25 'and 25 ") projecting beyond the different cross-sectional widths (26) of the strip material cross-section (21) are each machined in the successive removal length regions by different tools (40). 11. The method according to claim 10,
characterized,
that the different tools (40) in succession. brought into the working position to the roll bale (25 ', 25 ") (36', 36") and then moved along this over the respective removal length range (38 ', 38 "). 12. The method according to any one of claims 10 and 11,
characterized,
that two removal processes are carried out simultaneously from the bale ends facing away from one another with approaching movement on the circumference of the bale. 13. The method according to any one of claims 10 to 12,
characterized,
that the movement length (38 ', 38 ") for each removal length range is limited to the distance (41) between two adjacent tools (40) (Fig. 3). 14. A method for rolling strip material cross-sections of different cross-sectional widths, in which the rolling cycle is started with the largest occurring cross-sectional width and completed with the smallest occurring cross-sectional width, and in which the support length for the bales of the work rolls is adjusted at least approximately to the respective cross-sectional width of the strip material cross-sections by the bales of the work rolls are released in their length ranges that extend beyond the respective cross-sectional width by removing them from the circumference of the bale, according to one of claims 1, 2 and 4 to 8, characterized in that a laser beam (60 ', 60 ") is directed onto the length regions (58) of the bales (55) of the work rolls (52) to be freed and thereby between this laser beam (60 ', 60 ") and the bale (55) a relative movement in the circumferential direction (62) and longitudinal direction (61', 61") is generated (Fig. 14). 15. The method according to claim 14,
characterized,
that the laser beam (60 ', 60 ") is directed perpendicularly onto the outer surface of the bale (55). 16. The method according to any one of claims 14 and 15,
characterized,
that the removal depth on the circumference of the bale (55) is determined by the energy regulation of the laser beam (60 ', 60 ") taking place as a function of the roller speed and / or roller contour. 17. The method according to any one of claims 1 to 16,
characterized,
that the same track lines are passed over several times in succession with the laser beam (60 ', 60 ") at the length regions (58) to be freed. 18. The method according to any one of claims 14 to 17,
characterized,
that the number of track line crossings is determined by the respective roller contour. 19. Roll stand, in particular four-roll stand, for carrying out the method according to one or more of claims 1 to 9,
characterized,
that at least the work rolls (2 ', 2 ") are assigned, on the one hand, parallel and, on the other hand, transversely displaceable removal devices, for example turning devices, milling devices, grinding devices and / or other suitable devices. 20. Roll stand according to claim 19,
characterized,
that a pair of removal devices (9; 9 ', 9 ") is provided and at the same time against the end regions (6.2 - ....- 6.5) of the roll bales (5' and 5") of both work rolls (2 'and 2 ") can be adjusted . 21. Roll stand according to claim 19 or 20,
characterized,
that the removal devices (9; 9 ', 9 ") are arranged on the strip inlet guide (7; 7', 7") and can be adjusted with this to the cross-sectional width (1.1 - ... -1.5) of the strip material cross section (1) (Fig. 7). 22. Roll stand according to one of claims 19 to 21,
characterized,
that two pairs of removal devices (10) are provided and one of them can be brought into effect on each of the work rolls (2 'and 2 ") (FIG. 8). 23. Roll stand according to claim 22,
characterized,
that the removal devices, for example paired grinding units (10) can each be pivoted about the longitudinal axis of the support rollers (3 ', 3 ") and can be adjusted against the circumference of the roller bales (5', 5" (the work rollers (2 ', 2 ")) (12, 13, 14). 24. Roll stand according to claim 19,
characterized,
that it is equipped with a work roll bending device. 25. Roll stand according to claim 19,
characterized,
that the work rolls (2 ', 2 ") and / or the backup rolls (3', 3" (a thermal roll gap influence is assigned. 26. Roll stand, in particular four-roll stand, for carrying out the method according to one or more of claims 10 to 13, in which at least the work rolls, on the one hand parallel and on the other hand displaceable transversely to the roll axis, removal devices, for example. Turning devices, milling devices, grinding devices and / or other suitable Facilities that are assigned
characterized in that a special tool (40) of a tool group sits in a tool carrier (36 'or 36 ") for each cut-off length range of the roll barrel (25', 25"), which is at most by the extent of a cut-off length range is displaceable parallel to the roller axis (38 'or 38 "), and that the various tools (40) of the tool group can be set individually in succession with the tool carrier (36' or 36") in the working position relative to the roll barrel (25 ', 25 "). 27. Roll stand according to claim 26,
characterized,
that all tools (40) of the tool group are seated in a common tool carrier (36 'or 36 ") designed as a turret head, which is adjustable (42) about an axis parallel to the rolling axis (37-37) in one of the roller stands. (30 ', 30 ") carried adjusting device (31', 31";32;33;34; 35) held (35 ', 35 ", 35'"; 39). 28. Roll stand according to one of claims 26 and 27,
characterized,
that the tools (40) consist of turning tools inserted into the tool carrier (36 'or 36 ") designed as a turret head. 29. Roll stand according to one of claims 26 to 28,
characterized,
that the overall length of the tool carrier (36 ', 36 ") designed as a turret is matched to the maximum machining length (28) of the roll barrel (25' or 25"). 30. Roll stand according to one of claims 26 to 29,
characterized,
that the amount of removal of the tools (40) on the one hand by their radial position in the tool carrier (36 'or 36 ") designed as a turret head and on the other hand, it can be determined by a feeler roller (43 'or 43 ") which is arranged coaxially to the tool carrier (36' or 36") and which can be adjusted with it against a support collar (44 'or 44 ") of the work roll (22' or 22") is. 31. Roll stand according to one of claims 26 to 30,
characterized,
that the radial position of the tools (40) in the tool carrier (36 'or 36 ") designed as a turret head can be changed by adjusting devices. 32 roll stand according to one of claims 26 to 31,
characterized,
that the tool carrier (36 'or 36 ") designed as a turret head is axially displaceable relative to the feeler roller (43' or 43") in the adjusting device by a hydraulic or mechanical feed drive between two fixed end positions (38 'or 38 "). 33. Roll stand according to one of claims 36 to 32,
characterized,
that two tool carriers (36 'and 36 ") designed as turret heads with matching tool groups and each with a feeler roller (43' and 43") are mirror images of one another in a common adjusting device (31 ', 31 ";32;33;34"; 35) are seated and are rotatable in the same direction (39, 42), but axially displaceable in opposite directions (38 'and 38 "). 34. Roll stand according to one of claims 26 to 33,
characterized,
that the individual tools (40) of a tool group with uniform angular distances (42) are arranged distributed in the circumferential direction of the tool carrier (36 'or 36 ") which is designed as a turret head. 35. Roll stand according to one of claims 26 to 34,
characterized,
that several tool groups are arranged one behind the other in the circumferential direction of the tool carrier (36 'or 36 ") designed as a turret head, and each of these is arranged relative to the feeler roller (43' or 43"). can be preset to another removal rate. 36. Roll stand according to one of claims 26 to 35,
characterized,
that a coolant and / or lubricant spray device (46) is assigned to the or each tool carrier (36 'and 36 "designed as a turret head (for the working area of each tool (40). 37. Roll stand according to one of claims 26 to 36,
characterized in that the adjusting devices (31 ', 31 ";32;33;34',34"; 35) are provided with a working plane inclined towards the roller plane between the roller stands (30 ', 30 ") (Fig. 2). 38. Roll stand, in particular four-roll stand, for carrying out the method according to one or more of claims 14 to 18,
characterized,
that laser devices (59 ', 59 ") with laser beam axes (60', 60") that can be aligned perpendicular to the jacket of the respective bale (55) are assigned to it. (Fig. 14). 39. Roll stand according to claim 38,
characterized,
that each laser device (59 ', 59 ") is arranged to be movable (61', 61") parallel to the roller axis (FIG. 14). 40. Roll stand according to one of claims 38 and 39,
characterized,
that laser devices (59 ', 59 ") with energy control are provided.

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