FR2730431A1 - COLD ROLLING MACHINE FOR THIN STRIP AND SHEET STRIP - Google Patents

Abstract

Cold rolling mill for thin strip and for sheet strip which comprises at least one rolling stand with several rolls (stand 1 with quarto rolling train) as well as at least one unwinder (6) and at least one winder (8) for the rolling strip, the unwinder (6) being mounted in a plane (5-5) above the plane (2-2) of the stand (1) of the rolling mill quarto train and the coiler (8) in a plane (7-7) below the plane (2-2).

Description

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  Cold rolling mill for thin strip and foil strip In the usual cold rolling mills for thin strip and foil strip according to DE 35 25 038 C2, which are equipped with at least one rolling stand comprising support rolls and vertically mounted working rolls as well as at least one reel and at least one winder, the clamping forces to produce the rolling force and the bending forces to compensate for the camber of the rolls and to regulate the grip are introduced in the vertical direction in the cylinder trunnions and the strip passes in the horizontal direction through the grip

  io between the working cylinders.

  Due to the vertical mounting of the support rollers and the working rolls of a rolling stand comprising two rolling stand uprights which are provided with a closed frame to promote the clamping forces, favorable working conditions are not met for the rolling of thin strip and

sheet metal sheet.

  In the usual cold rolling mills for thin strip and sheet strip having closed rolling stand uprights, the application surfaces of the rolling chairs are not always well determined. Due to the necessary mounting clearance, there is a tilting of the rolling chairs during the introduction of the rolling torque and differences in friction torque when adjusting the cylinders. The regulation of the clamping and bending forces as well as the balancing of the cylinders is very complicated due to the asymmetrical force and bending conditions which are obtained for the supporting cylinders and the upper and lower working cylinders of a rolling stand due to the self-weight of the rolls. The thermal load of the rolling mill stands which is not the same and which is due to the rolling oil coming down from the upper rolls to the lower rolls and the rising heat give asymmetries in the heat balance of the stand

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  of rolling mill which must be taken into account as parasitic quantity during

  regulation of clamping and bending forces.

  The uneven thermal load of the upper face and the lower face of the rolling strip has a disadvantageous effect on the surface quality of the strip. The removal of the beginning of the strip from the reel and the installation of the strip, in particular a double strip or a strip which can be doubled, in the right-of-way and the transport of the strip from the right-of-way to the reel by means of mechanical and / or pneumatic conveyor devices such as guide rollers or pneumatic tables are very complicated. In addition, the unwinding of a doubled strip in the usual cold rolling mill assembly can only be carried out with great difficulty. The installation and removal of the crown and the empty strip reels on the reel and on the winder can only be obtained in several operational steps which require a lot of time and work. Difficulty accessing rolling stands, oil catch basins, strip thickness gauges and strip flatness measuring rollers give considerable difficulty in cleaning leftover laminating facilities of strip and maintenance of the various parts of the installations and the measuring devices. The measurement of the strip thickness, which should be carried out as far as possible downstream of the right-of-way, requires an adequate positioning of the strip thickness measurement device by complicated devices located downstream of the right-of-way. The quality of the upper face and the lower face of the rolling strip is affected, in addition to the differences in thermal stress, also by the necessary guide rollers. In addition, an offset of the support rolls and / or the working rolls as a function of the strip width is subject to limits in

  reason for guidance in the upright window.

  The invention relates to a cold rolling mill structure as a rolling stand for a duo, quarto and multiple train, in particular as a quarto cold rolling train for thin strip and for sheet strip which does not have the disadvantages set out above thin and cold strip rolling mills

usual sheet.

  According to the invention, this is achieved by a cold rolling mill for thin strip and for sheet strip which comprises at least one rolling mill cage.

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  several cylinders as well as at least one reel and at least one winder for the rolling strip and which is distinguished by a horizontal mounting of the rolls, by a horizontal application of the clamping and bending forces at the ends of the rolls, by a vertical passage of the rolling strip in the area between the working rolls, as well as by mounting the multi-roll cage or multi-roll cages, the reel and the winder in planes

  superimposed on a building or a cage.

  Preferably the cylinders are mounted in io cylinder uprights or in support trestles which are integrated into an auxiliary structure or

to a building structure.

  Cylinder chairs are preferably supported so

  hydrostatic on a horizontal guide.

  Preferably, a cage with a quarto rolling train comprises two working rolls and two support rolls, as well as a device for bending the working rolls in the horizontal direction and in the direction

  vertical passage of the rolling strip.

  Preferably, it is possible to axially slide the cylinders

  and / or the support cylinders to adapt to the width of the strap.

  Preferably, a cage with a quarto rolling train is erected in the median plane of a building, a reel housed in a plane higher than the median plane of the building and a winder for the strip of

  rolling planned on a plane below the median plane.

  Preferably, it is possible to slide the reel and the

  winder transverse to the strip passage plane.

  There is preferably a regulation of the position of the reel and the reel to adjust at the level of the strip passage plan the starting point of the strip which takes place from the reel and the entry point of the

  strip that wraps around the winder.

  Preferably, at least two reels and two reels are provided for laminating several times, in particular for the double rolling of a strip.

thin and a sheet metal.

  Preferably, devices are provided for cooling, lubrication and heating of the cylinders comprising inlet boxes which are mounted directly on each other, which are open in

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  direction of the surface of the cylinders and which serve to supply zone by zone or totally the cylinders of a rolling oil or an oil emulsion

  rolling across the width of the rolls.

  Preferably, provision is made for a subdivision of the inlet boxes by intermediate partitions into chambers comprising valve flaps for

supply and close the rooms.

  Preferably, intermediate partitions are provided which can be moved to adjust the width of the chambers of the inlet boxes according to the width of the strip and the width of the cooling zones in

  io a regulation of the flatness of the strip.

  Preferably, there is provided a collecting tank for the rolling oil.

located below the cylinders.

  Preferably, a reserve tank of fresh rolling oil and / or an inlet tank is provided for receiving the rolling oil coming from the catch basin which is drawn up in the elevation plane of the cage. rolling mill. Preferably, a transport wagon is provided which can move in the plane of the reel and which comprises at least two pairs of saddles for transporting the crowns of a bearing, in particular of a shelving bearing, to the reel, or to the reels, and to win the empty reels removed from the reel, or reels, to a vertical winding device comprised between the upper plane of the reel, or reels, and the lower plane of the reel, or reels, as well as a transport wagon which can be moved in the lower plane and comprising at least two pairs of saddles for transporting the reels of strap from the winding device to the winder, or to the winders, and for

  win the winder crowns, or winders.

  Preferably, passage rails are provided for conveying the empty strip reels in the upper plane of the transport wagon to the vertical winding device, as well as for transporting the strip reels in the lower plane of the winding device to the wagon transport. A cold rolling mill structure of this kind differs from conventional cold rolling mills by the advantages set out below: the rolling strip is placed in the right-of-way by gravity, possibly with pneumatic support , and / or using baffles without handling the strap. By using the force of gravity, the operation of placing the strip, in particular for doubling the sheet strip, is considerably simplified. When laminating a double sheet strip, the additional advantage is obtained, because of the vertical guide of the strip, that before the entry into the grip of the two sheet strips unwinding from two reels, the surfaces of contact of the two strips

  can very simply be projected by means of a separation agent.

  wo In addition it is possible to separate parts and trimmings of a double sheet without difficulty by two winder units. Weight balancing of the upper cylinders is not necessary. The clamping and bending of the working rolls and the supporting rolls, which are rotatably mounted in chairs of the same kind in the two rolling uprights or rolling stands of a rolling stand, which are symmetrical with respect to the plane vertical passage of the strap or Passline, are effected by clamping and bending forces which are applied by clamping cylinders and by bending cylinders whose position is regulated. By hydrostatic support of the cylinder chairs mounted horizontally on a horizontal guide surface, unequivocally defined application surfaces are obtained with minimum friction, which prevents the "Stick-Slip" effect which is created. by the thermal expansion of the rolls and which occurs in particular for long durations of winding of crowns in strip rolling mills. The problem which arises in conventional rolling mills, of compensating for the wear of the rolls due to friction disappears since the rolls are always adjusted on the middle of the cage and on the vertical plane of passage of the strip. By regulating at the height of the vertical plane of passage of the strip the position of the reel and the winder with respect to the current adjustment of the exit point of the strip unwinding from the reel and the entry point of the strip winding on the winding reel, the strip can pass from crown to crown in the right-of-way without being guided by deflection rollers and tension rollers, so that there is the possibility, over the contact length of the strip , to influence the working rolls on the quality of the strip surfaces, in particular a thin strip and a sheet strip. In addition, the

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  The fact that the thermal loads of the cylinders and therefore of the entire surface of the strip are the same also has a favorable effect on the surface quality, in particular of a sheet strip. The regulation of the speed of rotation of the reel and the winder according to the diameter of the crown which is continuously modified is simpler than for the usual cold rolling mills of thin strip and strip. Providing the reel with a crown and removing the empty spool from the reel as well as providing the reel with an empty reel and removing the reel from the reel can be done in one operation step. When the rolling stand which extends horizontally is in the raised position, compared to the usual rolling mills in which the oil bowl is under the floor, the rolling oil which escapes can be captured relatively simply in an oil bowl mounted raised below the rolling stand, and the fresh oil reserve tank as well as the inlet tank for receiving the rolling oil from the catch basin can also be raised. The device for cooling and lubricating the cylinders, comprising inlet boxes which are mounted directly above the cylinders, which are open towards the surface of the cylinders and which are used to supply zone by zone or totally with oil of rolling or 2o of an emulsion of rolling oil the rolls on the width of the rolls, allows an optimal cooling and lubrication of the rolls. In the case where a regulation of the flatness of the strip is necessary, the flatness measuring roller ensures, due to the constant angle of winding of the rolling strip which is allowed by the vertical guide of the strip, error-free measurement , zone by zone of the tensile tension of the strap over the entire width of the strap. The strip thickness measurement can be carried out by an easily accessible measuring device provided near the right-of-way on the entry face and / or on the exit face of the strip of the rolling stand. Due to the good accessibility of all the parts of the installation, the maintenance of the rolling mill and the operation, which consists in ridding the rolling mill of strip flakes and strip residues, which are evacuated via a channel, and which is necessary in particular in the event of tearing of the strip to prevent any danger of fire, does not present any difficulty of any kind. The horizontal position of the rolls in the rolling stand uprights or rolling stand of a rolling stand

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  drawn up in the floor plan allows individual disassembly of each cylinder for repair or maintenance purposes, as well as necessary replacement of the cylinders. Finally, the new rolling mill is distinguished from the rolling mills conforming to the state of the art by the fact that it has become possible due to the new rolling design to achieve savings.

  considerable by dispensing with different installation parts.

  US 2,237,794 discloses a cold rolling mill for rolling to a final thickness of up to 0.254 millimeters from the hot-rolled strip material having a starting thickness of 9.5 to 12.7 millimeters. The rolling mill consists of several rolling units wrapped in an envelope and comprising horizontally mounted working rolls, the rolling units being mounted in two vertical rows, one of which is traversed by the rolling strip in a rolling direction directed towards the bottom and the other in an upward rolling direction. This state of the art is far from the teaching of the invention which consists in using a rolling mill comprising working rolls mounted horizontally for the rolling of a thin strip and a sheet strip to a final thickness of 0.200 to 0.006 millimeters and to be used as an optimum regulating variable for regulating the flatness of the strip, zone-by-zone cooling, which is possible due to the horizontal mounting of the cylinders, working cylinders and support cylinders by laminar deposition an oil of

  cooling and lubrication on the cylinders.

  The invention is explained in the following with the help of schematic drawings. In the drawing: FIG. 1 represents a rolling mill for rolling a thin strip and a sheet strip, FIG. 2 is a perspective view of a rolling cooling device and FIG. 3 represents a rolling mill for the double rolling of a strip

thin and a sheet metal.

  The main installation parts of the thin strip and sheet strip rolling mill shown in FIG. 1 are a cage 1 with a quarto rolling train drawn up in the plane 2-2 of a building 37 and comprising two rolling mill uprights or trestles 3, 4 support, a reel 6 housed in

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  a higher 5-5 plane above the 2-2 plane of building 37 and a winder

  8 for the strip 9 rolling in a plane 7-7 lower than-

below the plane 2-2.

  The two working cylinders 12, 13, which are rotatably mounted in the chairs 10, 11, and the support cylinders 16, 17, which are rotatably mounted in the chairs 14, 15, are mounted horizontally in the rolling stand 1 , and the chairs 14, 15 of the support cylinders 16, 17 are supported in the

  amounts of rolling mill or supported on the support trestles 3, 4.

  The clamping forces F are applied horizontally to the ends 1o of the supporting cylinders 16, 17 and the bending forces FB horizontally to the ends of the working cylinders 12, 13, and the rolling strip 9 passes in the vertical direction in the 'grip 18 between the cylinders 12,

13 working.

  In order to reduce the frictional forces when tightening the cylinders, s 5 the chairs 10, 11 of the working cylinders 12, 13 and the support chairs 14, 15 of the cylinders 16, 17 are hydrostatically supported on a

guide 38.

  The cage 1 with quarto rolling train is equipped with pressing rollers which are not shown for bending the working rolls 12, 13, on the one hand in the direction a of passage of the strip, in order to obtain an extension of the strip 9 of rolling in width, so as to prevent the formation of folds, and on the other hand, in the horizontal direction in order to counteract a lack of

  flatness of the rolling strip 9.

  The working cylinders 12, 13 and the supporting cylinders 16, 17 can slide axially to adapt to the width of the strip. This is made

  possible by the variable shape of the horizontal guide 38.

  The reel 6 and the reel 8 can slide transversely to the plane 19-19 for passing the strip. By regulating the position of the reel 6 and the reel 8, the point 20 of exit from the rolling strip 9 which unwinds from the reel 21 of the reel 6 and the point 22 of entry of the strip 89 which is wound on the reel 21 of the rewinder 8 can be adjusted continuously

  at the level of the 19-19 strip passage plan.

  From the vertical unwinding of the strip 9 for rolling the reel 6, the diameter of the crown 30 provided on the reel can be deduced continuously and the speed of rotation of the reel regulated as a function

  changing the diameter of the crown.

  The device for cooling, lubricating and heating the working cylinders 12, 13 and the supporting cylinders 16, 17 consists of inlet boxes 23 according to FIG. 2 which are mounted directly one above the other, which are open towards the surface of the cylinders and which serve to supply zone by zone or totally the cylinders 12, 13, 16, 17 of a rolling oil or of a rolling oil emulsion over the entire width of the cylinders. The inlet boxes 23 are subdivided by partitions 39 intermediate into chambers 40 comprising valve flaps which are not shown to supply and close the chambers. The intermediate partitions 39 which can be moved, the inlet boxes 23 make it possible to adjust the width 41 of the chambers 40 of the inlet boxes 23 as a function of the width of the strip and the width of the cooling zones

  in a regulation of the flatness of the strip.

  The inlet boxes 23 provide optimum lubrication and cooling of the cylinders 12, 13, 16, 17 by laminar deposition of a film of cooling oil on the cylinders. This gives a maximum residence time of the oil film on the cylinder and there is thus a good peeling of the thermal body of the cylinder. The fan distribution of the chambers of the inlet boxes allows cooling and lubrication zone by zone of the cylinders. A cooling of this kind of cylinders gives an optimal regulating quantity for the regulation of the flatness of the strip. Below the cylinders 12, 13; 16, 17 is a bowl 24 for collecting the rolling oil which is integrated into the cage 1 with a quarto rolling train located in the plane 2-2. In addition, on plan 2-2 there is a tank 25 for reserving fresh rolling oil and / or a tank 26 for arrival

  to receive the rolling oil from the catch basin 24.

  The thin strip and foil strip rolling mill is equipped with a transport wagon 27 which can move in the plane 5-5 of the reel 6 and which has two pairs 28, 29 of saddles for transporting a crown 30 of a bearing 31 to the reel 6 and to take up an empty reel 21 removed from the reel 6 to passing rails 32 by means of which the reel 21 is supported by a device 33 for vertical winding which transports the reel 21 to the plane 7-7 below the building plane, another transport wagon 27 comprising two pairs 28, 29 of saddles which can be moved in this plane (7-7). The empty reels 22 conveyed by the vertical winding device 33 are transmitted by means of passing rails 34 to the transport wagon 27 which leads a reel 21 to the reel 8 and wins a crown 30 removed from the

winder 8.

  It is mounted below the oil bowl 24, a little behind the grip 18, a device 35 for measuring the thickness of the strip and a roller

io 36 for measuring flatness.

  The thin strip and sheet strip rolling mill shown in FIG. 3 for the double rolling of a thin and sheet strip 9 differs from the rolling mill of FIG. 1 for the simple rolling of a thin strip and a strip by the fact that it is equipped with two reels 6

and two winders 8.

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Claims (16)

  1. Cold rolling mill for thin strip and for sheet strip which comprises at least one rolling mill stand with several rolls (stand 1 with quarto rolling train) as well as at least one reel (6) and at least one winder (8 ) for the rolling strip and which is distinguished by a horizontal mounting of the rolls (12, 13; 16, 17), by a horizontal application of the clamping forces (F) and of the bending forces (FB) at the ends of the rolls, by a vertical passage (a) of the rolling strip in the right-of-way (18) between the working rolls (12, 13), as well as by mounting the cage (1) with several cylinders or cages with several cylinders , the reel (6) and the winder (8) in overlapping planes (2-2, 5-5, 7-7) a building (37) or a cage.   2. Rolling mill according to claim 1, characterized by an assembly of the cylinders (12, 13; 16, 17) in cylinder uprights or in support trestles (3, 4) which are integrated into an auxiliary structure or a structure of building.   3. Rolling mill according to claims 1 and 2, characterized by hydrostatic support of the cylinder chairs (10, 11; 14, 15) on a horizontal guide (38).   4. Rolling mill according to one of claims 1 to 3, characterized by at   at least one cage (1) with quarto rolling train comprising two working rolls (12, 13) and two support rolls (16, 17), as well as a device for bending the working rolls (12, 13) in the horizontal direction and in the   direction (a) vertical passage of the strip (9) rolling.   5. Rolling mill according to one of claims 1 to 4, characterized by a   possibility of axially sliding working cylinders (12, 13) and / or   support cylinders (16, 17) to adapt to the width of the strip.   6. Rolling mill according to one of claims 1 to 5 by a cage (1) to train   rolling quarto which is erected in the median plane (2-2) of a building (37), by a reel (6) housed in a plane (6-6) greater than the median plane (2-2) of the building (37) and by a winder (8) for the strip (9) of rolling provided on a plane (7-7) below the plane (2-2) median.   7. Rolling mill according to one of claims 1 to 6, characterized by a   possibility of sliding the reel (6) and the winder (8)   transverse to the plane (19-19) of passage of the strip.   8. Rolling mill according to claim 7, characterized by a regulation of the position of the reel (6) and the winder (8) to adjust at the plane (19-19) of passage of the strip the starting point (20) of the strip (9) which unwinds from the reel (6) and from the point (22) of entry of the strip (9) which is wound on the winder (8).   9. Rolling mill according to one of claims 1 to 8, characterized by at   at least two reels (6) and two winders (8) for laminating several times,   in particular for the double rolling of a thin strip (9) with a sheet.   10. Rolling mill according to one of claims 1 to 9, characterized by   cooling, lubrication and heating devices for cylinders (12, 13; 16, 17) comprising inlet boxes (23) which are mounted directly on top of each other, which are open towards the surface of the cylinders and which are used to supply zone by zone or totally the cylinders (12, 13; 16, 17) of a rolling oil or an oil emulsion   rolling across the width of the rolls.   11. Rolling mill according to claim 10, characterized by a subdivision of the boxes (23) of arrival by partitions (39) intermediate chambers (40) comprising valve flaps for supplying and closing the chambers (40). 12. Rolling mill according to claim 10 or 11, characterized by intermediate partitions (39) which can be moved to adjust the width (41) of the chambers (40) of the boxes (23) of arrival as a function of the width of the strip and of the width of the cooling zones in a regulation of the flatness of the strip. 1 3 2730431   13. A rolling mill according to one of claims 10 to 12, characterized by a   rolling oil catch basin (24) located below the cylinders (12, 13; 16, 17).   14. Rolling mill according to one of claims 10 to 13, characterized by a   fresh lamination oil reserve tank (25) and / or an inlet tank (26) for receiving the lamination oil from the catch basin (24) which   is drawn up in the elevation plane (2-2) of the rolling stand (1).   15. Rolling mill according to one of claims 10 to 14, characterized by a   transport wagon (27) which can move in the plane (5-5) of the reel 1o (6) and which comprises at least two pairs (28, 29) of saddles for transporting the crowns (30) of a bearing (31), in particular a shelving bearing, at the reel (6), or at the reels (6), and for winning the empty spools (21) withdrawn from the reel (6), or reels (6), to a vertical winding device (33) between the upper plane (5-5) of the reel (6), or reels (6) and the lower plane (7-7) of the winder (8), or winders (8), as well as by a transport wagon (27) which can be moved in the lower plane (7-7) and comprising at least two pairs (28, 29) of saddles for transporting the strip reels (21) from the winding device (33) to the winder (8), or to the winders (8), and for   win the crowns (30) of the winder (8), or of the winders (8).   16. A rolling mill according to claim 15, characterized by rails (32, 34)   passage for conveying the empty strip reels (21) in the plane (5-   ) upper part of the transport wagon (27) to the winding device (33)   vertical, as well as for transporting the reels (21) of strip in the plane (7-   7) lower of the device (33) for reassembly to the transport wagon (27).