EP0665067B1 - Cluster mill of the roll housing type with direct hydraulic adjustment - Google Patents

Abstract

The column type multi-roll stand comprises a roll set (2) above the rolling gap and a corresponding roll set (3) below this gap, and is preferably provided with a direct hydraulic setting system. Two roll sets with a larger number of rolls enclosing respectively working rolls (5) and (5') with a relatively smaller diameter can be replaced with two roll sets with a smaller number of rolls enclosing working rolls with a relatively larger diameter, and vice versa. In both cases each roll set (2,3) has a number of rolls which remain without changes. Working change allows a 20-roll stand to be converted into a 14-roll stand. In this case the rolls (5,6,7,8) in the roll set (2) and the rolls (5',6',7',8') in the roll set (3) are replaced by a single larger-diameter roll in each roll set.

Description

The rolling of high-strength materials to the smallest final thickness required for forming and economic reasons work roll diameter as small as possible. For these use cases the well-known multi-roll stands have prevailed. The existing and increasing demand for Tapes of the smallest final thicknesses were, among other things, a reason to run fast To develop 12 and 20-roll stands. Essentials A feature of these multi-roll stands is the number of rolls the direct hydraulic adjustment with the narrowest strip thickness tolerances can be guaranteed. Qualitatively different adjusting mechanisms acting on the roll gap contour are used to control or regulate the flatness of the strip. Rollers and support axes with support rollers are in two from each other vertically independently movable bearing housings. With their process, large roll cuts and Different usable options, even within narrow limits Compensate the work roll diameter. The latter Possibility to use different work roll diameters, as well as the comparatively high rolling speeds make the multi-roll stands also for large strip thickness ranges attractive. 20-roll stands offer due to their bale length relatively small work roll diameter advantages when Rolling thin, hard materials.

Both 12-roll stands and 20-roll stands have two Roll sets with work rolls at the ends facing each other of the two sets of rolls that limit the roll gap and act on the rolling stock from two sides. Except for the Work roll, each set of rolls has a number of inner intermediate rolls and outer support rollers on which the work roll is supported. The direct employment with 20-roll stands makes it possible with these without additional conversion measures and especially without changing the number of rollers optional work rolls with diameters in a ratio of up to 2.5, for example between 30 and 70 mm.

According to the rolling task, i.e. depending on bandwidth, minimum and maximum strip thickness, strip material etc., the roll stand type must be selected, e.g. Two, four or 20-roll stand.

When rolling to the smallest final thicknesses, it is also known to multi-stage rolling process to use different types of stands, who perform different tasks. For example known, multi-roll stands with 12 or 20 rolls and small diameter work rolls to use economical, i.e. with as few passes as possible, from one relatively large initial thickness to a smallest final thickness to come from, for example, 0.01 mm or 0.05 mm and thereafter Subsequent rolling the surface of the rolling stock by using the rolled stock without any significant change the multi-roll stand reached final thickness by a roll stand passed with a relatively large roller diameter becomes.

The relationship between the number of rollers and the diameter of the roller leaves The easiest way to explain it is that leaner work rolls, i.e. Smaller diameter work rolls more than thicker rollers tend to sag and therefore, i.e. to avoid bending, a better one Supporting the work rolls is what the use requires a larger number of support and intermediate rolls. That is, for the re-rolling process with the thicker rollers two and four-roll stands are used.

The types of multi-roll stands previously used now have one roll number each once defined. A 12-roll stand always works with 12 rolls, a 20-roll stand works always with 20 rollers. That means that at a first Rolling process with a very small final thickness from one relatively thick starting material in one pass at best a few passes and the need surface finishing two different roll stands must be used. First a multi-roll stand for example 20 rolls, of which the work rolls are very are slim for reducing the thickness of the rolling stock and followed by a roll stand with fewer rolls, whereby the work rolls have a relatively large diameter.

JPA-52-73158 describes a method for changing the Use of a multi-roll stand including some of the rolls a work roll with small diameters removed and through a large diameter roller can be replaced as a work roller.

The object of the invention is now to design a multi-roll stand in such a way that work can be carried out with it, such as they have so far been carried out on a 20-roll stand, however also work that has a larger work roll diameter than possible with a 20-roll stand. Object of the invention in other words, to show a multi-roll stand, that the advantages of a multi-roll stand, for example of a 20-roll stand, with simple means however can be changed so that an economical Use when rolling thicker strips or even the Use as a skin pass mill is possible.

The object is achieved by the invention, its features arise from the claim.

As a result, there is a roll stand with the invention, which is a 20-roll stand and equivalent for all work can be used for the 20-roll stands are; with the rolled material brought to a final thickness can be, for example, at least in the range of 0.10 mm. After a relatively simple conversion, with the Roll stand can also be carried out with almost the same efficiency, for which other roller stands have so far been used. Training as a 20-roll stand with the Larger number of rollers are good prerequisites for the fact that conversion to roller sets with work rolls, the larger one Have such a number of support rollers in the stand remains that the remaining number of rolls is still sufficient the work rolls with a larger diameter, i.e. smaller ones Support requirements, support, on the other hand but so many support rolls can be removed that work rolls can be installed with larger diameters.

On the other hand, a roll stand with one is essential created a larger area of application. Is the roll stand as Equipped with 20-roll stand, so you can use it in optimal Wise rolling operations are carried out as they use today's 20-roll stands require, so it can in particular Rolled material optimally rolled to the smallest final thickness will. There is no need to cut back on a 20-roll stand be made in standard construction. Is the same roll stand converted to a 14-roll stand with less effort, which, given the situation described above, turns out to be proves easily feasible, the conditions are almost reached, as they are necessary for re-rolling. That means, that hardly any compromises compared to a special finishing mill have to be done. In addition, the area of application of the roll stand according to the invention again as expanded can be viewed by being in the equipment as a 20-roll stand Final thicknesses in the range of 0.10 mm can be achieved then the roll stand is converted to a 14-roll stand and before that with the very slim work rolls on the wanted final thickness that was possible with the 20-roll stand Rolled material by using the far less lean Work rolls of the 14-roll stand without additional thickness reduction undergoes a surface treatment for an entire Range of use cases is sufficient. So a rolling mill must something with the purchase of a roll stand according to the invention invest more than if you just bought a 20-roll stand would, but can work with one machine of two roll stand types, so that the invention Ultimately, the solution is the more economical solution will represent. But there is an optimal re-rolling with a usual roll stand with, for example, two or with four rollers and the rolling mill operator creates a special one Machine, so it can process rolled material be that comes from only one machine according to the invention, where it according to the currently common technique of two different ones Roll stands are coming. So it is one with the invention a number of points of view more economical problem solving possible.

The invention is explained below with reference to the drawing, 1 in Fig. 1 a roll stand equipped as a 20-roll stand is shown and in Fig. 2 the same roll stand the conversion to a 14-roll stand is shown; the In both cases, the roll stand is schematic with a viewing direction shown in the direction of the roll axes of rotation. In Fig. 3.4 is a side view (partially in section) of an embodiment the upper part of a roll stand (Fig. 3) or one Cross-sectional view of this upper part (Fig. 4) shown.

The roll stand is a stand construction with direct hydraulic adjustment. The hydraulic Employment is denoted by 1. Employment 1 offers the advantage of being free in large areas selectable stroke within a certain limit minimum / maximum usable work roll diameter selected can be. The limit is defined by the geometry of the two Roller sets 2.3 determined. It can be implemented as 20-roll stand with work roll diameter ratios of up to 2.8, as already realized with known roll stands is designed exclusively as a 20-roll stand are and wherein work rolls 5, 5 'can be used, the Diameter can be between 30 and 70 mm, for example.

The multi-roll stand according to the invention is a 20-roll stand designed in the equipment according to FIG. 1. In the roll stand 4 the hydraulic adjustment 1 is arranged at the top, that directly onto the upper bearing housing 15 with the upper roller set 2 acts, which in turn with the work roll 5 the top of the rolling material 14 acts or the roll gap 14 'limited from above, and a work roll 5' one lower roll set 3 on the underside of the rolling material 14 acts or limits the roll gap 14 'from below. The Work rolls 5, 5 ', inner intermediate rolls 6, 7 or 6', 7 ', outer intermediate rolls 8, 9, 10 or 8 ', 9', 10 'and support rollers 11 or 11 'of the upper roller set 2 or the lower Roll set 3 correspond to the state of the art, so that in detail only as described in connection with Fig. 3, 4 happens, must be addressed. The bearing housing 15, 15 'of both sets of rollers 2 and 3 are adjustable relative to each other arranged in the roll stand, on the one hand the lower To bring support roller set 3 to pass-line height, on the other hand to be able to open the roll gap 14 'to different degrees. Correspondingly, employment 1 or drives are designed; the rotational movement of the rollers or rollers is controlled by a Drive that works like the job itself and is therefore not shown.

With respect to the rollers 5 to 10 and 5 'to 10' on the one hand and the rollers 11, 11 'on the other hand, it should be noted that all rollers 5 to 10 or 5 'to 10' in one piece from their one are continuously formed to work rolls at their other end to form intermediate rolls, while with 11 or 11 'support rollers are designated, but not in one piece trained continuously from one end to the other are, although they correspond to the work and intermediate rolls Length, but which consist of individual roles, those with relatively small distances next to one another in a rotationally fixed manner Shaft 16 are assigned so that the support rollers 11, 11 ' referred to in practice as roller sets or support roller sets will.

According to the invention, the roll stand is now of the 20-roll stand 1 convertible to a 14-roll stand according to FIG. 2. For this purpose, the roller group 5 to 8 or 5 'to 8' of each roller set 2 or 3 removed and in their place is one single work roll 13 or 13 'with a correspondingly larger Diameter stored in the respective bearing housing 15 or 15 '. The work roll 13 is supported in each roll set 2 or 3 or 13 'on the rollers 9, 10 or 9', 10 '. Essential to the invention is the coordination between the roller groups 5 to 8 or 5 'to 8' on the one hand and the work roll 13 or 13 'on the other hand in the respective roll set 2 or 3 and the possibility of storing them in lateral layers or bearing housings of the roll stand such that in each of the two Drop the work rolls onto the rolling stock 14 'in the nip 14 act and their proper support possible or guaranteed are. So there are so many from the 20-roll stand Rollers can be removed so that space is created for two rollers large diameter.

So there are from the roll stand according to the invention initial equipment as 20-roll stand as many rolls including the work rolls 5, 5 'expandable that space is created for two work rolls 13, 13 'accordingly larger diameter. Nevertheless, both roller sets remain 2, 3 so many rollers that it is for the thicker and consequently less work rolls 13 which tend to bend, 13 'is sufficient.

3, 4 with 15 is the upper part or the upper housing called a multi-roll stand according to the invention, so that the roller set shown is the upper roller set 2 acts according to Fig. 1, 2, it being assumed that the multi-roll stand as a 20-roll stand corresponding to FIG. 1 is set up. The lower set of rollers 3 is accordingly educated.

The support roller set comprising the rollers 11 and the support axes 16 is supported on the bearing housing 15 by means of saddle pieces 17, the saddle pieces 17 independently of one another by means of adjusting devices are adjustable, for example from each a pair of wedges 22, 23, on which the housing 15th supported actuator 23 a piston-cylinder unit 24, 25th acts, the other actuator 22 of the respective saddle piece 17 is assigned. Every saddle is one Actuator assigned independently of the actuators the other actuator works.

The lateral of the outer intermediate rollers 9, 10 are on the bearing housing 15 adjustable by piston-cylinder units 18, 19 stored, with only the two units 18, 19 for the lateral outer intermediate roller 9 are shown, the other side outer intermediate roller 10 but is mounted accordingly. Corresponding is the middle outer intermediate roller 8 on one Piston-cylinder unit 20 mounted.

The piston-cylinder units 18, 19 and 24, 25 and 20 are articulated on the bearing housing 15. The inner intermediate rolls 6, 7 are also articulated on the bearing housing 15 (not shown in Figure 3); the work roll 5 is between Rolled stock 14 and the intermediate rolls 6,7 loosely inserted. The work roll 13 can be suspended by means of a piston-cylinder unit, similar to the piston-cylinder unit 20.

Finally, it should be pointed out that modifications possible are. This includes in particular that the hydraulic adjustment 1 instead of the upper bearing housing 15 also on the lower bearing housing 15 'can act.

Claims (1)

1. A twenty-roll stand comprising two identical sets of rolls (2, 3), one roll set (2) including backing rolls and intermediate rolls (6-11) together with a working roll (5) which acts directly on the top of the rolled stock (14) whereas the other roll set (3) includes backing rolls and intermediate rolls (6'-11') and a working roll (5') which acts directly on the underside of the rolled stock (14), characterised in that the roll stand has the following additional features:

   1.1 each of the two roll sets (2, 3) is mounted in a separate bearing housing (15, 15'), wherein a hydraulic adjustment means (1) acts directly on the upper bearing housing (15) in order to alter the distance of the working roll (5) in the roll set (2) from the working roll (5') in the other set (3) mounted in the lower stationary bearing housing (15') and thus alter the width of the nip;

   1.2 in each of the two roll sets (2, 3) the three rolls (8-10; 8'-10') in an outer row of intermediate rolls co-operate in such a way that the central intermediate roll (8, 8') co-operates with each of the two lateral intermediate rolls (9, 10; 9', 10') in the said outer row of intermediate rolls and each of the said intermediate rolls cooperates with backing rolls (11; 11') in an outer row of backing rolls and with intermediate rolls (6, 7; 6', 7') in an inner row of intermediate rolls, against which the respective working roll (5, 5') abuts;

   1.3 the lateral intermediate rolls (9, 10; 9', 10') in each outer row of intermediate rolls (8-10; 8'-10') are held on the respective bearing housing (15; 15') by a respective adjustable piston-cylinder unit (18, 19), whereas the middle intermediate roll (8, 8') in each outer row of intermediate rolls (8-10; 8'-10') is held on the respective bearing housing (15; 15') by a third adjustable piston-cylinder unit (20);

   1.4 a number of backing rolls (11, 11') in each row of outer backing rolls are mounted on a backing shaft (16), the backing shafts are mounted in the bearing housings (15; 15') ; the outer set of backing rolls (11; 11') in each roll set (15; 15') and the backing shafts (16) are mounted in the respective bearing housing (15; 15') via saddle members (17), and the saddle members are adjustable independently of one another by adjustment devices (22, 23 and 24, 25);

   1.5 the working roll (5; 5'), the intermediate rolls (6, 7; 6', 7') in the row of inner intermediate rolls and the intermediate rolls (8-10; 8'-10') in the row of outer intermediate rolls in each roll set (2, 3) are so dimensioned that after removal of the working roll (5; 5'), the intermediate rolls (6, 7; 6'-7') in the row of inner intermediate rolls and the middle intermediate roll (8, 8') in the row of outer intermediate rolls (8-10; 8'-10') it is possible to install a working roll (13; 13') which acts on the top or underside of the rolled stock (14) and bears on the outer intermediate rolls (9, 10; 9', 10') in the outer row of intermediate rolls (8-10; 8'-10'), whereupon the roll stand can be used as a fourteen-roll stand.

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