DE2502947A1 - DEVICE FOR ADJUSTING ROLLING ROLLS - Google Patents

Description

ur.-lng. Dipi.-Phya. OSKAR KÖNIG patent attorney

- DeuteAe Bank AG S u ti cart

Telephone: (071 1) HBES 29 64 61 - Kon; ο No. 8y Ό0 3ύ ^

Telegram: Koenigpat 7000 STUTTGART- !, Klüpfelstraße G Postscheck Stgt.84iM "

Poelfach 51

h EETAHACHINEC G- h PA Fitfcsburgrh, Pennsylvania, LLA

Device for adjusting rolling mill rolls

50983 1/064 0 _ ₂ _

ORIGINAL iNSPECTED

The present invention relates to a device for adjusting (positioning, adjusting) rolling mill rolls and in particular a device for coarse positioning, for example when changing rollers. Certain Features of the invention can also be used for fine or thickness control of a moving belt, strip, Sheet metal or the like, or alternatively, known fine or thick te uannit te 1 in connection with the invention can be used, as will be explained below.

Although the setting or positioning device according to the invention is described below primarily in connection with a four-roll tandem cold rolling mill or a four-roll or four-high stand for cold rolling, the invention can also be applied to other types of cold rolling mills and also to skin-pass mills (tempering _{mills /} hot rolling mills and Although the invention is suitable for both coarse and fine positioning of mill rolls, certain features of the invention relating to coarse positioning can also be used in conjunction with conventional fine or thickness control devices.

For a long time there has been a need for simple and effective ^ means for quickly performing posi-

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tion settings of rolling mill rolls. Such attitudes were primarily in the past Line by means of elekijomechnisehen pressure screw devices (Pressure spindle devices) or hydraulic retaining cylinders (hold-down cylinder) and the like have been made. Known roller adjusters require complicated roll stand structures and usually have positional inaccuracies, especially when the same roll position must be maintained for a considerable period of time. Operation more conventional Equipment requires great effort, especially for turning pressure screws under heavy rolling loads. In addition, have the strong dynamic and stationary loads of a typical roll stand causes the pressure screws to have enormous restricting forces against attempted rotation to develop.

Rough adjustment of the roller position is often necessary because of this they are adapted to the diameter range occurring in the normal service life or a wear cycle got to.

The gauge control system which is provided in most roll stands, is limited to short-stroke changes in the roll position resulting from conditions that are determined by rolling theory and other structural considerations. By the invention Adjusting device it is extremely desirable to provide a longer stroke, which in a preferred embodiment too

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is able to do both, namely coarse and fine roll adjustment.

The roll adjusting device according to the invention is also capable of common fine or thickness control operations with sufficient accuracy and responsiveness.

The roller positioning device recited in claim 1 isb able to replace the conventional electromechanical To work pressure screw devices or instead of conventional hydraulic retaining cylinders. In addition, the roller positioning device according to the invention is suitable to enable a longer stroke with higher accuracy to the desired end position. Such roll adjustment accuracy and motion tenderness are ensured by using a "lock" to positively change any further adjustment of the To prevent roll adjuster. A single retention of hydraulic fluid prevents setting inaccuracies, which would result from different types of leaks. The inventive The device makes it easier to maintain a constant pass line setting.

The adjustment device according to the invention allows a simplified Frame construction of the scaffolding, as there is no need for pressure screws or other adjustment devices pass through the upper sections of the roll stand frame.

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The roller setting device according to the invention can be relatively can easily be installed in existing rolling mills, with the result that an existing rolling mill can be used for approximately half the cost of a new rolling mill can be converted. The converted rolling mill then becomes productive like a new rolling mill of advanced design. Tape or strip material is currently used according to lengths rather than sold by weight. Consequently, tons of material can be saved by having the rolling mill on top of that lower side of the thickness test works. To that end is

working
a very accurate / roller setting device required.

In the drawing are exemplary embodiments of the invention shown, it being understood that the invention is implemented in numerous other embodiments can be. In the drawing show:

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- 6 -

Fig. 1 is a fragmentary front view

of a roll stand, which has a roll positioning device according to the invention having,

Fig. 1A shows a section of the framework of

Fig. 1 with a piston-cylinder arrangement in the fully extended position,

1B shows a variant of a detail of FIG

Fig. 1, which shows another embodiment of limiting means for hydraulic Fluidum represents

2 shows a section through the roll stand

of Fig. 1 seen along the section line H-II,

Fig. 3 is a side view of the roll stand of

Fig. 1 corresponds to a section along section line IH-III.

One embodiment of the new roller positioning device

/ in

A four-roll stand 12 (four-high roll stand) is inserted (adjusting device) 10, which has a pair of work rolls 14, 16
and a pair of backup rolls, one of which is denoted by 18,

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Has. In this exemplary embodiment, the frame 12 has a Pair of uprights 20, 22, which are spaced in the usual manner are arranged from each other, as can be seen from Fig. 1 and 2 and each of which has a window 24, as can be seen particularly clearly from FIG. The backup rolls are provided with bearings (bearing blocks) 26, which are arranged in the stand windows 24. The work rolls 14, 16 are similarly provided and arranged.

A platform 28 which forms part of the roll positioning device 10 forms, extends between the uprights 20, 22 (Figs. 1 and 2) and stands through the upper portions of the Window of the rack over. Mounted on the platform 28 are a pair of roller positioning cylinders 30 and a pair of fine or Thickness control cylinder (Fig. 1, 1A). A hollow piston 34 extends over the top of each of the two roller positioning cylinders 3O over and engages the underside of the associated stand crosshead 36. The roller positioning cylinders 30 and the fine control cylinder 32 are described in more detail below. At the moment it is sufficient to make the roller positioning cylinders 30 and their pistons 34 and the associated components of the roller positioning device 10 clear the gaps between the crossheads 36 and the bearing blocks 26 of the upper. Bridge the backup roller.

In a middle position between the uprights 20, 22, a balancing or holding cylinder 38 is on a carrier

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pair 40 (Fig. 3) arranged, which extends between the crossheads 36. The cylinder 38 is with a suitable Provided piston, the piston rod 42 suitably pivotable with the central region of the Roller positioning platform 28 is connected by means of a fork 44 or the like. The cylinder arrangement 38 causes the roller positioning pistons 34 and the associated lower surfaces 46 of the housing heads 36 during the operation of the roll stand 12 constantly in

(Attack)
Engagement / with each other. In this sense, the cylinder assembly 38 also supports the weight of the roller positioning platform 28 and associated components of the roller positioning device 10. More importantly, the cylinder assembly 38 can exert sufficient upward forces (arrow 48) on the platform 28 to maintain the piston-cylinder alignments 30,34 a-cis to compress their fully extended positions (Fig. 1 £) or from intermediate positions into the fully retracted positions (Fig. 1).

The space between the roller positioning platform 28 and the upper backup roller bearings or blocks 26 can be bridged by means of a pair of saddles 50, which are arranged on the backup roller bearings 26 or are integral with the backup roller bearings 26 (Figs. 1 and 3)

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and engage the adjacent lower surfaces of the platform 28. If the platform 28 ^a ^ - ^s more compact

is trained,

Bodies of uniform thickness / ie, if the flat cylinder assemblies 32 and associated components are omitted, provision can be made for the upper backup roll 18 to be positioned solely by the positioning cylinder assemblies 30. In the embodiment shown, however, the roller positioning cylinders 30 are used for the coarse adjustment of the backup roller bearings 26, whereas the fine control or flat cylinders 32, which are arranged in series with the roller positioning cylinders 30, as shown, are used for fine adjustment Fine control cylinders 32 can also be located elsewhere instead of on the roller positioning platform. It is also understood that other conventional fine control devices can be provided if necessary. The fine control cylinders 32 and associated components are described in the brochure "Mesta Machine Company Bulletin" Gage Control-Constant Force Rolling and Strip Guiding Electrohydraulic Roll Positioning System (Sermes ¹ ".

In short, the flat cylinder assemblies 32 (which have a very short stroke) are actuated by associated piston devices, which are shown in Fig.

- Io -

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denoted as a whole by the reference numeral 54 and within of the platform 28 by means of two flexible plates 56, 58 are included, of which the outer plate 58 is sealed by means of a peripheral seal 60 with the Underside of the platform 28 is connected. The pistons 54, together with the pressure chambers 55, are the fine control cylinders connected by suitable lines, not shown, which extend through the platform 28.

At their terminal ends (blind ends) are the roller positioning cylinders 30 and the fine control cylinder 32 by means of common partition plates (end plates) or disks 62 (Fig. 1, 1A) closed. A peripheral edge portion of such two arranged one behind the other Cylinders 30, 32 associated partition plate 62 is between the opposite edges of the roller positioning

_ neighbor
Cylinder 30 and the / fine control cylinder 32 used to

to hold the partition plate 62 in its appropriate position, as can be seen in Figures 1 and 1A.

Each of the roller positioning pistons 34 is provided with an internal sealed chamber or cavity 64, which is shaped so as to be able to contain essentially all hydraulic fluid which is present in each of the Cylinder 30 is used. In the application shown, such fluid can be useful, but not necessary, have a fat-like consistency, contains graphite and is of known composition.

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5 0 9 8 3 1/0 6 A 0

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Also located within the piston cavity 64 is a bladder 66 which seals a pressurized one Contains gas filling and is arranged substantially in the upper region of the piston cavity 64. In an exemplary application of the invention as illustrated, For example, the bladder 66 may be made of a known material that is compatible with the hydraulic fluid. The bladder 66 suitably contains a suitable pressurized and inert gaseous fluid, such as nitrogen, and serves as a boundary between the nitrogen contained in it and the hydraulic fluid, which the remaining space of the piston hollow space 64 fills.

An alternative embodiment is shown in Figure 1B and shows a floating piston 67 which separates the hydraulic medium and the inert gas, the latter in the variable volume gas chamber 67a and the former in the variable volume hydraulic chamber or Piston cavity 64 'is included. The piston 67 is with a rim or flange 69 for stability and suitable sealing means, such as an O-ring 71, are provided. In the

(hydraulic circuit / hydraulic circuit)

self-contained hydraulics / each positioning piston-cylinder The arrangement or unit 30, 34 also has a shut-off valve 68 which is arranged on an upper, protruding area of the piston 34 by means of connecting lines 70, 72, which the shut-off valve 68 with the adjacent wall surface of the piston 34 (Figures 1, 2)

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associate. As can be seen from a comparison of FIGS. 1 and 1A As can be seen, the area of the piston 34 is present. which the valve 68 is attached in this way, inner via the associated cylinder 30 and each valve 68 moves with its associated piston 34. Appropriately the valve lines 70, 72 can be rigidly connected to the adjacent wall surface of the piston 34 by means of threads or be connected by means of tight welded joints or the like. The connecting lines arranged in this way communicate with assigned channels 74, 76, which are provided in the wall of the piston and of which the channel 74 into the pressure chamber 78 of the cylinder and the channel 76 leads into the piston cavity 64 or 64 '.

(relaxation)

After opening the valves 68 and relaxation / of the relief or hold-up cylinder 38 (all of this can also be done by remote control if desired) the bladders 66 (or the floating pistons) expand 6 7 move downwards) and press hydraulic fluid from the piston cavities 64 or 64 'through the connecting lines 74, 76 into the pressure chambers 78 (Fig. 1A) of the Roller positioning cylinder 30. This increases the impact

jQracü)
attack / between the pistons 34 and the crossheads 36 with the result that the platform 28, the upper backup roll 18 and associated components of the roll stand 12 downwards towards the limit position shown in FIG. TA

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be pressed. In the latter position of the roller positioning device 10 a force of hydraulic fluid remains within the piston cavities as a balancing fluid in the event of leakage losses (leaks). The aforementioned limit position of the piston 34 is determined by circumferential shoulders 80, 82 attached to the inner surfaces of the cylinders 30 and outer surfaces the piston 34 (Fig. 1A) are provided. When the desired extended position of the pistons 34 is reached, For example, the valves 68 can be closed to lock the roller positioning platform in this position (to be held).

When the innermost limit position of the piston 34 (Fig. 1). brought about is by opening the valves 68 and lifting the platform 28 by means of the relief cylinder 38, hydraulic fluid flows in the opposite Direction through the piston channels 74, 76 to the innermost piston limit position (Fig. .1) essentially all hydraulic fluid is again within piston cavity 64. In this position (Fig. 1) the innermost position of the pistons 34 in the roller setting cylinders 30 is limited by contacting the curved lower floor surfaces 84

concerned
the piston 34 with the / partition plates 62 of the blind ends

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the cylinder 30. As a result of this in the Kolbenhohlräuir.e 64 forced hydraulic fluids are gas-filled Bladders 66 transferred into their contracted state shown in FIG. 1.

The pressure chambers 78 of the cylinder 30 are by means of hydraulic Packings 86 sealed containing O-rings 88, which in this exemplary embodiment are arranged on the pistons 34 on their delimiting shoulders 82.

When the bladders 66 are compressed in this way in a controlled manner with the assistance of the valves 6 8, hydraulic fluid is forced out of the pressure chambers 78 of the cylinders 30 and returned by return forces, which are desirably and constantly applied to the pistons 34 by the lift cylinder 38, which presses the roller positioning device 10 continuously against the crossheads 36, as above was declared. To a limited extent, some or all of the hydraulic fluid will return to the Piston cavities 64 also counteracted by the aid of the upper backup roller bearings 26 and the saddle members 5O causes abutment pressures exerted on the lower surfaces of the platform 28.

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As the bubble 66 expands or contracts by the collar of the piston of the cylinder 38, flows hydraulic fluid between the piston cavities 64 and the pressure chambers 78 of the cylinders through the channels 74, 76. When the desired position of the roller positioning device 10 is reached, the shut-off valves 68 are closed so that a predetermined range of the hydraulic fluid is "locked" or confined in each of the cylinder chambers 78. This provides a rough adjustment to the upper backup rolls 18 and associated therewith Components of the mill stand 12. The setting can easily be changed when the rolls of the mill stand must be readjusted to compensate for wear and tear during operation of the roll stand. Fine tuning the Roll setting device 10, i.e. the gauge control, is effected by the very small movements or strokes of the pistons 90 of the Fein control cylinders 32.

The positioning device or adjusting device according to the invention 10 therefore provides both in this exemplary embodiment, namely coarse and fine adjustments the roll positions during operation of the roll stand. In addition, the roller positioning platform 28 can be quick be raised and lowered, for example for the purpose of changing rollers or when a relatively wide Opening between the Arheitswalzen is desirable. If. In contrast, the previously known required slow ones

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Eewegungsvorrichtungen considerable effort and time for rough positioning or for back movements during roll change processes.

Operation of the roll positioning device 10 will now be described in connection with a typical roll change and the operation of the roll stand 12 is described. Initially, the lift cylinder 38 pulls the roll set platform 28 in the direction of the upper end of the roll stand 12, i.e. against the crossheads 36 of the uprights 20, 22 this time the valve 6 8 is opened so that the coarse

/ 34
positioning pistons go deeper into cylinders 3C. When the pistons 34 are forced deeper into the cylinders 30, hydraulic fluid from the pressure chambers 78 (Fig. 1A) of the cylinders 30 is forced through the channels 74, the control valves 68 and then through the associated channels 76 and into the piston cavities 64, up to the innermost position of the piston 34 is present (FIG. 1). As the hydraulic fluid or grease flows into the piston cavities 64, the pressurized filling of the bladders 66 with inert gas is further compressed so that these bladders assume a shape approximately as shown in FIG.

After the hydraulic "fluid" is substantially removed from the cylinder chambers 78, the control valves 68 closed so that the lifting cylinder 38 is no longer

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the one compressed by what is inside the bubbles The forces exerted by the gas must counteract. At this time the fine control piston 90 are also fully withdrawn.

When the above-described work sequence takes place, the conventional, not shown, relief pistons * which are normally provided in the roll stand 12, are operated to support the roller bearings 26 and the Raise the support roller 18 into the position shown approximately in FIG. The work rolls 14, 16 are taken out and replacing them with work rolls be used in their place. The changing of the rollers can be done in any suitable manner.

After inserting the new work rolls (in contact raiteir.-

not shown
other), the / backup roll relief pistons are lowered to lower the backup roll 18 into contact with the upper work roll 14. At this time or shortly afterwards the control valves / are opened. This operation, together with the relaxation of the lift cylinder 38, allows hydraulic fluid, driven by the pressurized bladders 66, to flow from the piston cavities 64 in a now opposite direction through the channels 74, 76 and control valves 68 into the pressure chambers 78 (Fig. 1A ) the cylinder 30 to ■ flow. The device 10 is thereby forcefully actuated to cause the saddles 50, platform 28, and roller positioning cylinders 30

The bearing blocks 26 therefore remain in firm contact with the roller positioning saddles 50, which in turn are in contact with the original surface of the platform 28.

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and their pistons 34 forcefully move the space between the backup roll bearings 26 and the crossheads 36 of the roll stand 12 bridge. At this point the mill stand is completely leveled.

correct roller gap for strip or sheet reduction between the Arbeits.walzen 14, 16 can now can be set. For this purpose, the fine

/ up
The valves 68 of the roller positioning cylinders 30 are then closed to prevent further transfer of hydraulic fluid between the piston cavities 64 and the pressure chambers 78 of the cylinders 30. The platform 28 of the apparatus 10 is now "locked" at a fixed height relative to the crossheads 36 of the uprights 20, 22. An upward force (arrow 48) is continuously applied by the retaining cylinder 38 for proper engagement between the pistons 34 and the crossheads 36.

The roll relief pistons for the upper work roll bearings 52 and the upper backup roller bearings 26 are now actuated and the fine control pistons 90 are fully returned in order to have the correct roll gap for strip or band (sheet metal reduction between the work rolls 14, 16 to manufacture.

-19-

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The roll stand 12 is now ready for insertion and for Stripe or band reduction in the usual way. When the strip or tape passes between the work rolls 14, 16, the thickness can be corrected by means of suitable Movements of the fine control piston 90 using conventional sensing and control circuits (not shown) be made with the piston devices 54 are coupled. After the rough adjustment of the rollers has been carried out as described above, the shut-off valves remain 68 closed, so that the above-described coarse adjustment is now locked within the roller positioning device / whatever a height of the platform 28 is required. This height is determined by the amount of hydraulic Fluiduni which is between the pressure chambers 78 of the cylinders 30 and the piston cavities 64 are changed before the control valves 68 are closed became. Subsequent positioning of the upper back-up roll 18 and upper work roll 14 is carried out by means of the fine control cylinder 9o until a new coarse position setting becomes necessary again. A coarse adjustment may be required periodically based on the readjustment of the work rolls 14, 16 or the backup rolls 18 or both or if a roll change is required is necessary for some reason. If there is insufficient wear on the folds or any

-19b-

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needs a rough adjustment of them is that
small stroke of the fine control piston 90 sufficient, ur
to compensate for the occurring range of tape or strip thickness for different tapes or strips in one production process. - ■ -.- "

- 2O -

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Claims (1)

1. ^ roll stand with one frame and with at least two Rollers slidably mounted in windows of the frame and bearing blocks (bearings) adjacent to each their ends have, characterized by a pair of roller positioning cylinder-piston assemblies (30,34-) - the curl over gaps between the bearings (26) of an adjacent roll (18) of the roll stand rolls and opposite end regions (46) of the Roll stand frame, hydraulics (hydraulic circuits) for stretching the cylinder-piston arrangement (3o, 34) for pressure attack / mxt the bearing blocks (26) and the adjacent frame areas (36) for Positioning rollers and by a compensating piston Zy linder arrangement (38), which with the two roller positioning piston-cylinder arrangements (3o, 34) is coupled »to the piston (34) or cylinder (30) in Ending the pressure attack (bearing engagement) traced back. 2. Roll stand according to claim 1, characterized in that that a pair of saddle members (5o) between the roller positioning cylinder-piston assemblies (3o, 34) and the bearing blocks (26) are inserted, - 21- 509831/064 0 3 = roll stand according to claim 1 or 2, characterized by a roll positioning platform (28) which is inserted through the window (24) so that the cylinder-piston assemblies (3o, 34) are fixedly ^{mounted on} adjacent ends of this platform (28) are and that the relief piston-cylinder assembly (38) between frame end regions and an intermediate section of the platform (28) is coupled. 4. Roll stand according to one of the preceding claims, " characterized in that a pair of fine control piston Zy linder arrangements between the bearing blocks (26) and the roller positioning piston-cylinder arrangements (3o, 34) are arranged. 5. Roll stand according to claim 4, characterized that the fine control cylinders and the rollers respectively sitioning cylinder / arranged back to back and a common partition or end plate (62) is inserted between them. 6. Roll stand according to claim 1, characterized in that that each of the hydraulic systems mentioned is self-contained and is essentially within the area assigned to it Roller positioning piston-cylinder arrangement (3o, 34) is located. 7. Roll stand according to claim 6, characterized in that each of the roll positioning pistons (34) is hollow and is designed in such a way that it essentially contains everything " - 22 - 50983 1/0640 may contain hydraulic fluid, which in the 'relevant roller positioning piston-cylinder arrangement (3o, 34) is used. 8. Roll stand according to claim 7, characterized in that that * each of the hollow pistons (34) with a pressure chamber located within the associated cylinder (3o) (78) is connected by channels (74,76) which are at least partially within a wall area of the Pistons (34) are provided. 9. Roll stand according to claim 8, characterized in that a channel area provided with valve means (6 8) a line (7o, 72) is attached to the piston (34) is arranged and can not move with this .O. Roll stand according to one of Claims 6-9, characterized in that that in each of the hollow pistons (34) an expandable pressure medium is contained by at least part of the hydraulic fluid from the piston cavity after. SpanruncTPverminderupg ^the equalizing piston-cylinder arrangement (38) to be pressed out. .1. Roll stand according to claim lo, characterized in that that each of the expandable pressure means comprises an expandable bladder (66) in which a sealed Filling of pressurized gaseous Fluicur \ is included. - 23 50983 1/064: 0 12. Roll stand according to claim 6, characterized in that each hydraulic system has an expandable bladder, which contains a pressurized gas filling and is sealed in a cavity in the assigned cylinder positioner? Folben (34) is arranged. 13. Roll stand according to claim lo, characterized in that that each of the expandable pressure means has a floating piston (67), the hydraulic Fluid and a compressed gas filling separates from each other. 14. Roll stand according to one of the preceding claims, characterized in that the roller positioning Ko lben (34) are hollow and the height is insane εο frozen, that they can contain essentially all of the hydraulic fluidure which is present in the roll positioning piston-cylinder assemblies is included. 15. Roll stand according to claim 14, characterized in that expandable pressure means are arranged in each Folbenhohlrsur, uir. to extract at least one part of the hydraulic fluid contained in the cylinder assembly after the force (relaxation) of the / "1" S ¹ ""] calibration cylinder arrangement has decreased. 16. VrJ. zoor '-' st according to one of the preceding claims, characterized in that the roller positioning piston-cylinder arrangement are arranged instead of conventional pressure spindle or similar roller positioning devices (adjusting devices). 509831/0640 BATH ORIGINAL ZS Le e rs e iie