EP0114795A2 - Stützeinrichtung an einem Walzwerk - Google Patents

Stützeinrichtung an einem Walzwerk Download PDF

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Publication number
EP0114795A2
EP0114795A2 EP84850006A EP84850006A EP0114795A2 EP 0114795 A2 EP0114795 A2 EP 0114795A2 EP 84850006 A EP84850006 A EP 84850006A EP 84850006 A EP84850006 A EP 84850006A EP 0114795 A2 EP0114795 A2 EP 0114795A2
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EP
European Patent Office
Prior art keywords
rolls
bearings
work rolls
arrangement
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84850006A
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English (en)
French (fr)
Other versions
EP0114795A3 (de
Inventor
Per-Olof Strandell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0114795A2 publication Critical patent/EP0114795A2/de
Publication of EP0114795A3 publication Critical patent/EP0114795A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/145—Lateral support devices for rolls acting mainly in a direction parallel to the movement of the product

Definitions

  • This invention relates to an arrangement at rolling mills, especially sheet mills and strip mills, for mounting work rolls therein, which rolls have a smooth shell surface along at least a substantial part of their length, and two or more hydrostatic bearings acting against said smooth shell surfaces are provided for supporting the work rolls.
  • Rolling mills for hot rolling sheet and strip of steel and other metals conventionally are designed as two-high rolling mill with only two work rolls or as four-high rolling mill, in which the work rolls are supported each by a back-up roll of greater dimension -
  • the work rolls are provided with a cylindric roll barrel and with a journal of smaller dimension at each end, which are provided with roller bearings or plain bearings for taking up horizontal and vertical forces.
  • the vertical forces are taken up by the back-up roll, whereby the work rolls can be dimensioned so as to take into account that the roll journals must take up only the horizontal forces.
  • the present invention has the object to provide a novel and i m - proved arrangement for hydrostatic support of work rolls, by which arrangement the inconveniences heretofore involved with such support are eliminated at least to a substantial extent.
  • the bearings are movable to positions, in which they are in contact with the smooth shell surfaces, and their portions which contact the shell surfaces have a small area and a lower wear resistance than said shell surfaces. It is hereby possible, after the regrinding of the work rolls to adjust the hydrostatic bearings simply, rapidly and comfortably to the shape of the rolls ground, in that the bearings are moved into contact with the rolls, so that the rolls at their rotation effect the shape adjustment of the bearings required for the bearings to operate satisfactorily.
  • a hydrostatic pressure medium is intended to flow out, leak, in a controlled manner between said portions and shell surfaces, whereby effective cooling of the rolls and cleaning from particles, so-called scale etc., are obtained.
  • the hydrostatic bearings can be moved into contact with the work rolls at times also between the regrinding operations of the work rolls, in order thereby to adjust the bearings to such minor wear or deformation of the work roll surfaces which do not necessitate regrinding of the work rolls.
  • said portions of the bearings when in contact with said shell surfaces exercize a grinding or polishing effect on said surfaces.
  • the arrangement therefore, also comprises means for effecting a reciprocatory relative movement between the bearings and work rolls substantially in parallel with the geometric axes of the work rolls.
  • the arrangement according to the invention advantageously can be utilized at both two-high and four-high rolling mills.
  • the hydrostatic bearings When the invention is applied to four-high rolling mills where hydrostatic bearings are provided for supporting the work rolls in a direction substantially transversely to a plane including the two work roll axles, while back-up rolls are provided for supporting the work rolls on the sub- stantailly diametrically opposed sides of the work roll gap, the hydrostatic bearings preferably are movable to positions, in which the plane including the two work roll axles is moved in parallel in relation to a plane including the two back-up roll axles.
  • the hydrostatic bearings can be placed so that the plane including the work roll axles, seen in relation to the rolling direction, is located somewhat in front of the plane including the back-up roll axles, whereby a substantial parttof the roll forces acting in the rolling direction, which forces normally can amount to about one tenth of the roll forces acting perpendicularly to the rolling direction, can be deflected to the back-up rolls, which results in a reduced load of the hydrostatic bearings of the work rolls. It is, of course, also possible to mount the back-up rolls in the way prescribed according to the invention for the work rolls. The way of mounting the back-up rolls, however, is less critical, because the back-up rolls are not subjected to appreciable wear. The back-up rolls, therefore, at many applications can without inconvenience be mounted by utilizing conventional mounting technique.
  • the hydrostatic bearings according to the invention preferably are divided by partition walls in a manner known per se into a plurality of pressure chambers, which are distributed along the length of the work rolls and have preferably individually adjustable supply of pressure medium, in such a manner, that portions of the partition walls contacting the work rolls preferably are elastically deformable to adapt to the shape of said shell surfaces. It is herebyyprevented that the work roll surfaces are locally subjected to a heavier wear caused by the partition walls when the hydrostatic bearings adapt their shape to that of the work rolls.
  • Fig. 1 the numeral 1 designates the back-up rolls of a four-high rolling mill, and 2 designates the work rolls located between the back-up rolls 1.
  • the geometric axes of all four rolls 1,2 normally are located in one and the same vertical plane.
  • the work rolls are intended to be supported according to the present invention by means of hydrostatic bearings 3 arranged so as to support the work rolls 2 in a direction substantially transverse to a plane including the.two work rolls.
  • Two or more hydrostatic bearings 3 act against a smooth shell surface 4 of each work roll 2.
  • two bearings 3 are located against each roll 2 on diametrically opposed sides of the roll in the rolling direction, where each bearing is a ramp 5 extending along the roll 2, which ramp can comprise a single, long pressure chamber (not shown in Fig. 1), but preferably in a manner known per se is assembled of a plurality of small pressure chambers 6 or bearing pockets 6 located in rows to the side of each other, as indicated in Fig. 1.
  • Each ramp 5 or row of bearing pockets is secured in a suitable way, for example by dovetail groove, on a supporting ramp 7 where, thus, four supporting ramps are provided.
  • Each supporting ramp 7, and therewith each bearing 3, is individually movable to and from a work roll 2 by suitable, for example hydraulic, devices (not shown in Fig. 1).
  • the numeral 8 in Fig. 1 designates conduits for pressure medium supply to each bearing 3.
  • Fig. 2 the numeral 7 designates a supporting ramp or the like, on which pressure chambers 6, bearing pockets 6, are secured by dovetail- like grooves.
  • the chambers 6, of course, can be secured on the ramp 7 by means of screwing with bolts or in some other way.
  • the supporting ramp 7 comprises a longitudinal passageway 9, through which a pressure medium, for example an oil emulsion or water, is intended to be transported and via communication channels 10, one channel or more per chamber 6 or pocket 6, to be introduced into the bearing through one and, respectively, more corresponding channels 11 in the chamber 6, as shown in Fig. 2.
  • a pressure medium for example an oil emulsion or water
  • Each pressure chamber 6 or bearing pocket 6 comprises a recess 12, feeding chamber 12, intended to face to the roll 2, into which recess the channel) 12 open, and into which the hydrostatic pressure medium is intended to be fed under pressure, in such a manner, that the recess 12 with pressure medium is intended to constitute the carrying part of the bearing.
  • the recess 12 is defined by two pairs of sidewalls 13, 14 in parallel with each other, of which the sidewalls 13 extending in parallel with the axle of the roll 2 are shown sectionally in Fig. 2.
  • Each of the sidewalls 13 comprises a contact element 15 located in or at the wall 13, preferably in a longitudinal recess as shown in Fig. 2, where the contact element 15 projects from the free edge 16 of the wall 13.
  • the free edges 17 of the contact elements constitute portions, which contact the shell surface 4 and have a relatively small area.
  • the free edges of the contact elements and the free edges 16 of the sidewalls 13 have a configuration agreeing substantially with the rounding of the roll 2, as appears schematically from Fig. 2.
  • the second embodiment shown in Fig. 3 comprises a supporting ramp 7 and secured therein a pressure chamber 6 or bearing pocket 6.
  • a recess 18 is located which is intended to face to the roll 2, and in which a piston 19, bearing insert 19, is located and intended to be moved in the direction to and from the roll 2.
  • Said recess 18 is defined by two pairs of sidewalls 20,21, which are in parallel with each other, and of which the walls 20 extend in parallel with the axle of the roll 2 and are shown in Fig. 3.
  • the hydrostatic pressure medium is intended to be supplied under pressure through a conduit 24 or the like, which opens into the recess 18 behind the piston 19 and extends through the recess 18, and which is connected to a passageway 25 extending through the piston 19 and opening into the recess 23.
  • Said conduti 24 communicates with a main system 9 for medium supply which extends through the supporting ramp 7 and is indicated by dashed line in Fig. 3.
  • a conduit 2.6 also opens into the recess 18 behind the piston 19, through which conduit a pressure medium is intended to be transported for operating the piston 19 in the direction to and from the roll 2.
  • a contact element 28 is located, for example inserted in the outer surface 29 of the sidewall 27, as shown in Fig. 3, where the free edge 30 of the contact element 28 is intended to project from the free edge 31 of the sidewall 27 and to constitute portions of the bearing contacting the roll 2 in a way corresponding to that shown at the embodiment according to Fig. 2.
  • a contact element 36 is located in the piston 35 and faces to the roll 2.
  • Said contact element 36 extends in the recess 32, and the cross-section of the element 36 in a plane perpendicular to the direction of movement of the piston 35 is the same as that of the recess 32 and preferably rectangular.
  • the contact element 36 has a configuration adapted to the rounding of the roll 2, as shown in Fig. 4.
  • the element 36 consists of a porous material, for example a sintered metal or a ceramic, which is permeable in respect of the hydrostatic pressure medium.
  • the element 36 preferably comprises a longitudinal recess 38 facing t6 the inner surface 37 of the piston 35, by means of which recess pressure medium supplied through the conduit 34 is intended to be distributed over the element 36.
  • the numeral 39 in Fig. 5 designates contact elements, each of which has the form of a plane plate, and an element is intended to abut the inner surface of each sidewall 40 of a recess located in the pressure chamber 6 as shown in Fig. 5, which sidewalls 40 are in parallel with the axle (not shown) of the roll 2.
  • Said elements 39 are intended to be retained in'place by a clamping device comprising two plates 41, which are intended to abut each a contact element 39 and to be clamped apart by means of screws 42 or the like located between the plates 41, whereby the contact elements 39 are pressed against their respective sidewalls 40.
  • the portions, elements consist, for example, of a material corresponding to the kind of material used in brake linings. Upon contact with the rolls the elements are worn, whereby adaptation to the rounding of the roll is effected, for example after the regrind- ingsof the roll, by which the roll diameter is reduced.
  • the material of the elements also can be selected so that the elements exercize an appreciable grinding or polishing effect on the shell surfaces 4 of the rolls.
  • the elements may consist of honing material, grinding stone material or the like.
  • the effective contact area is relatively small, due to the porosity of the material.
  • the wear resistance of the material compared to that of the roll shell surfaces 4 also in this case can be selected so that a desired degree of grinding or polishing effect can be obtained.
  • the numeral 43 designates end wall elements, of which one element 43 is located at the inner surface of each sidewall 44 of the pressure chamber 6 extending perpendicularly to the axle of the roll (not shown in Fig. 5).
  • the free edges 45 of the end wall elements 43 have a shape adapted to the rounding of the roll 2 and are intended to seal against the shell surface 4 of the roll 2.
  • the end wall elements expediently are made of an elastic material, for example nylon, teflon or the like, whereby the diameter of the roll is permitted to vary without jeopardizing the sealing function. At a definite design of the elements 43, thus, sealing is possible even when the roll has been reground several times and the roll diameter thereby has been reduced.
  • end wall elements corresponding to the elements 43 are also provided in a suitable way.
  • the end wall elements preferably are located on the side surfaces of the respective piston perpendicular to the axle of the roll 2.
  • a bearing box 48 which is movable in vertical direction and guided in stands 47 of the mill.
  • the said movement is intended to be effected by means of a wedge 49, which is movable preferably in parallel with the axles of the rolls 46 and acts against the upper surface 50 of the bearing box 48 and against.
  • the inner surface 51 of an end element 52 which is associated with the stand 47 and holds together the same, and which inner surface 51 is angular relative to said upper surface 50, as shown in Figs. 6 and 7, where said wedge 49 is intended to be adjusted, for example by means of a fixed screw mounted at the wedge, which screw co-operates with a nut 54 and a fixed holder-on member 55. Coarse adjustment of the roll gap, thus can be carried out in this way by means of the wedges 49.
  • each bearing box three recesses 56,57,58 are provided which extend in parallel with the axles of the rolls 46.
  • a hydrostatic bearing according to the invention is located in each of the recesses.
  • Bearings 59,60 are located on diametrically opposed sides of the roll 46 in the rolling direction, and a bearing 61 is located on a diametrically opposed side of the roll 46 in relation to the roll gap 62.
  • the contact elements comprised in the bearings 59,60,61 are designated uniformly by 63 in the Figures.
  • Each bearing is movable individually to and from the roll 46 by means of two wedges 65,66 located in the recess behind the bearing.
  • One of the wedges is movable, for example in the same way as the wedges 49.
  • the arrangement according to the invention at the rolling mill shown in Figs. 6 and 7 also comprises means for effecting reciprocatory movement between the bearings 59,60,61 and rolls 46 substantially in parallel with the geometric axes of the rolls 46.
  • a slewing bracket 67 is hingedly attached, the other end of which is supported and eccentrically attached on a member 68, which driven by a motor is intended to rotate, whereby the bearing by means of the slewing bnacket 67 is caused to move in the said rreciprecatory manner.
  • a bearing 68 for example in the form of a needle bearing 68, is located between the bearing and the wedge package 65,66 located behind the bearing in the recess 56,57,58.
  • FIGs. 8,9 and 10 an arrangement according to the invention is shown, where four bearings 69 are assembled in a cassette or the like, and the cassette also is intended to comprise a pair of work rolls 70.
  • each roll 70 and pair of bearings 69 two supporting frames 71 are provided which extend in parallel with the axle of the roll.
  • two wedges 73,74 are provided which are located in a recess 72 in the frame.
  • the bearing proper 69 is attached to the wedge 74 located closest to the roll 70.
  • the bearing 69 is movable to and from the roll 70 by moving the wedge 74.
  • distance members 75 for example springs 75, are provided which are intended to keep apart the rolls 70 in unloaded state.
  • the cassette is intended to be inserted into an existing rolling mill, preferably from the side and, thus, in the longitudinal direction of the rolls.
  • the cassette is intended to be placed between the two rolls in a two-high rolling mill or between the work rolls 76 in a four-high rolling mill with back-up rolls 77, as shown in Fig. 8, where the driving is intended to be effected by friction between the rolls 70 and the work rolls in the existing mill.
  • Fig. 10 The mounting of the cassette in a stand 78 is shown schematically in Fig. 10. Between the supporting frames 71 two end wall elements 79 are located perpendicularly to the longitudinal direction of the rolls 70, in which elements the rolls 70 are simply attached by means of end journal 80. Through preferably one end wall element,79 conduits 81 for pressure medium supply and screws 82 or the like extend for moving the wedges 74.
  • a cassette according to the invention can be used, for example, at plate rolling.
  • a billet first is rolled by means of the ordinary work rolls of the plate rolling mill, and the cassette is inserted into the mill first when the thickness of the original billet has been reduced to a suitable degree.
  • Figs. 9 and 10 show-an embodiment of a means for effecting reciprocatory movement of the bearings in parallel with the rolls. Such means must not per se be combined with a cassette according to Figs. 8-10, but are more generally applicable at a bearing according to the invention.
  • a disc 84 or the like hingedly suspended and provided with a central hole 83 is located in a plane which is in parallel with the plane through the axles of the rolls.
  • One slewing bracket 85 or the like per bearing 69 of said pair extend between the bearing 69 and disc 84 and are hingedly attached to the same and located in the plane of the disc 84.
  • a rotary axle 86 substantially perpendicular to the plane of the disc comprises two axle elements 87, which are located eccentrically in relation to the geometric axis of the axle 86, which axle elements 87 are intended to co-operate with the hole 83 each in its disc 84, whereby upon rotation of the axle 86 ardaxle elements 87 the disc 84 is caused to carry out gyratory movement, and the bearings 69 hereby via the slewing bracket 85 are caused to move .reciprocatory.
  • a bearing for example in the form of needle bearing 88, preferably is provided between each wedge 74 and the bearing 69 and at the attachment of the bearing, as shown in Figs. 8 and 10.
  • the means for effecting reciprocatory movement in parallel with the axles of the rolls are hereby utilized, whereby variation in the cutting in the longitudinal direction fo the rolls is prevented.
  • the function of said means should be obvious in view of the above description.
  • the function of the bearing here is that of a hydrostatic bearing.
  • the leakage of pressure medium which at cold rolling for example is an emulsion of oil in water, and at hot rolling, for example,iis water, implies essential advantagesJ
  • the roll surface for example, is cooled effectively. Furthermore, the surface of tile roll and of the rolled material is cleaned, whereby particles, so-called scale, etc. are removed.
  • the work rolls are subjected to deflection induced a.o. by the roll force.
  • the work rolls may be, for example, the two rol's of a two-high rolling mill or the work rolls of a four-high rolling mill.
  • the deflection gives rise to, at times unacceptable differeizes in thickness of the rolled material transversely to its longitudinal direction, in such a way that the thickness is greater centrally on the product than at its edges.
  • cambering whereby the rolls are given slightly bobbin shape.
  • this method is, of course, very inflexible.
  • this problem can be substantially reduced, for example at four-high rolling mills, in that the bearings are movable to positions, in which the plane including the two work rolls is moved in parallel in relation to a.plane including the two back-up rolls, which movement normally takes place in the rolling direction.
  • the deflection can be controlled, and the component of the roll force acting on the work rolls to a substantial degree can be deflected to the back-up rolls.
  • the said movement hereby can take place by means of the described wedge arrangements and/or by means of the bearings when they comprise bearing inserts and adjusting devices as at the embodiments according to Figs.
  • each pressure chamber 6 comprises a member, such as the bearing inserts of said pistions 19,35, which are individually movable to and from ' -the roll.
  • each pressure chamber 6 comprises a member, such as the bearing inserts of said pistions 19,35, which are individually movable to and from ' -the roll.
  • an arrangement according to the invention at rolling mills offers several advantages over the prior art.
  • the invention impliesrthat bearings simply can be adapted to variations in the diameter of the work rolls, without dismantling the bearings for regrinding.
  • the invention further implies that the shell surface of the roll can be conditioned at demand by the bearings, without dismantling the rolling mill.
  • the invention further offers the possibility of very flexible cambering, which can be adapted to the product and rolling sequence.
  • the invention in this way renders possible a.o. substantial gains in capacity.
  • said leak flow of pressure medium the rolls are cooled effectively, and particles etc. are removed, whereby the service life of the rolls increases and the product quality is improved.
  • said cassette arrangement which is rendered possi ble by the low space requirements of the bearings, an existing rolling mill can be completed, whereby the capacity of the mill in respect of rolling thin products increases substantially and whereby in certain cases thinner products can be rolled.
  • More bearings per roll for example, than shown in the Figures can be provided, and the bearings can be moved in a way other than by wedge systems, for example hydraulically by means of pistons.
  • the movement of the pistons 19,35, bearing inserts can be effected, for example, mechanically instead of hydraulically.
  • the means for effecting said reciprocatory relative movement between bearings and rolls can operate in a different way, for example hydraulically or pneumatically.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP84850006A 1983-01-14 1984-01-04 Stützeinrichtung an einem Walzwerk Withdrawn EP0114795A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8300169A SE8300169L (sv) 1983-01-14 1983-01-14 Anordning vid valsverk
SE8300169 1983-01-14

Publications (2)

Publication Number Publication Date
EP0114795A2 true EP0114795A2 (de) 1984-08-01
EP0114795A3 EP0114795A3 (de) 1984-10-10

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ID=20349580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84850006A Withdrawn EP0114795A3 (de) 1983-01-14 1984-01-04 Stützeinrichtung an einem Walzwerk

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EP (1) EP0114795A3 (de)
JP (1) JPS59178112A (de)
SE (1) SE8300169L (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020203076A1 (de) 2020-03-11 2021-09-16 Sms Group Gmbh Walzgerüst zum Walzen von Metallband

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB858296A (en) * 1957-12-23 1961-01-11 Nat Res Dev Improvements in and relating to rolling mills for rolling metal sheet and strip
DE2507234A1 (de) * 1975-02-13 1976-08-26 Escher Wyss Ag Walzwerk
DE2657062A1 (de) * 1976-10-21 1978-04-27 Escher Wyss Ag Walzwerk
DE2651028A1 (de) * 1976-11-02 1978-05-11 Escher Wyss Ag Walzgeruest
AT359459B (de) * 1978-12-22 1980-11-10 Andritz Ag Maschf Walzenlagerung an kaltwalzgeruesten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB858296A (en) * 1957-12-23 1961-01-11 Nat Res Dev Improvements in and relating to rolling mills for rolling metal sheet and strip
DE2507234A1 (de) * 1975-02-13 1976-08-26 Escher Wyss Ag Walzwerk
DE2657062A1 (de) * 1976-10-21 1978-04-27 Escher Wyss Ag Walzwerk
DE2651028A1 (de) * 1976-11-02 1978-05-11 Escher Wyss Ag Walzgeruest
AT359459B (de) * 1978-12-22 1980-11-10 Andritz Ag Maschf Walzenlagerung an kaltwalzgeruesten

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020203076A1 (de) 2020-03-11 2021-09-16 Sms Group Gmbh Walzgerüst zum Walzen von Metallband
WO2021180395A1 (de) 2020-03-11 2021-09-16 Sms Group Gmbh Walzgerüst zum walzen von metallband

Also Published As

Publication number Publication date
EP0114795A3 (de) 1984-10-10
SE8300169L (sv) 1984-07-15
SE8300169D0 (sv) 1983-01-14
JPS59178112A (ja) 1984-10-09

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