US3724252A - Flattening mill - Google Patents

Flattening mill Download PDF

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Publication number
US3724252A
US3724252A US00076566A US3724252DA US3724252A US 3724252 A US3724252 A US 3724252A US 00076566 A US00076566 A US 00076566A US 3724252D A US3724252D A US 3724252DA US 3724252 A US3724252 A US 3724252A
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United States
Prior art keywords
rolls
work
roll
reaction
work rolls
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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.)
Expired - Lifetime
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US00076566A
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English (en)
Inventor
S Winterburn
W Baker
A Barker
J Holden
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Alcan Research and Development Ltd
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Alcan Research and Development Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B29/00—Counter-pressure devices acting on rolls to inhibit deflection of same under load, e.g. backing rolls ; Roll bending devices, e.g. hydraulic actuators acting on roll shaft ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers

Definitions

  • the present invention relates to rolling apparatus and is particularly directed to a rolling mill for rectifying bad shape in rolled products, although a rolling mill may be constructed in accordance with the principles of the present invention for producing rolled products in which bad shape is avoided or held to a minimum.
  • a rolling mill comprises flexible upper and lower work rolls, each work roll being backed either directly or through an intermediate roll by a single row of axially short backing rolls, each of which is carried in a carrier pivoted to a rigid member of the mill frame, the pivots of all the carriers associated with each work roll being aligned with one another, said mill including means for applying a substantially constant loading force to each of said carriers, the work rolls also being contacted by reaction rolls which contact the work rolls in such a manner that the reaction is substantially parallel with the plane of the strip pass between the work rolls to absorb the loads which arise in at least one direction parallel to the strip during rolling.
  • Reaction rolls may be provided on both sides of the work rolls and in such case the axes of the backing rolls lie on the plane'passing through the axes of the upper and lower work rolls.
  • reaction rolls may be employed on one side only of the work rolls, the reaction on the other side of the work rolls being provided by the backing rolls which are so arranged that the line of application of pressure to the work rolls is offset from the plane passing through the axes of the work rolls, the amount of said offset for each work roll being such that the plane passing through said line and the bite of the work rolls makes a small angle with the plane passing through the axes of the work rolls, said angle being preferably less than 10.
  • FIG. 1 illustrates an apparatus made in accordance with the principles of the present invention
  • FIGS. 2 and 3 respectively illustrate two different systems for varying the loading applied through the outermost loaded backing roll
  • FIG. 4a illustrates an individual hydraulic cell
  • FIG. 4b illustrates a modified individual hydraulic cell
  • FIGS. 5a, 5b and 5c illustrate modified forms of apparatus.
  • FIG. 6 is a fragmentary elevational view across the mill, looking from the left in FIG. 1 and FIG. 7 is view similar to FIG. 6, but showing individual loading cells and a loading control system as in FIG. 3.
  • FIG. 1 there is illustrated diagrammatically a rolling mill, from which the main frame elements have been omitted.
  • upper and lower main beams are indicated at 1 and 2 to provide the ultimate support for the thin and flexible work rolls 3 and 4, which may be driven rolls or which may be undriven and be turned by contact with the strip which is pulled through the rolls for the purposes of rectification of bad shape.
  • the loading support for the work rolls 3 and 4 is by means of axially short backing rolls 5, each supported in an individual carrier 6 pivoted to the respective beams 1 and 2 on the pivot axes 7.
  • the longitudinal clearance between the backing rolls 5 is kept as small as possible, consistent with the special requirements of the carriers 6.
  • Hydraulic capsules 8 which may be extended mattress-like elements as shown in FIG. 6 (or individual load cells for each carrier 6 as described below for FIG. 7), are arranged between the carriers 6 and wedges 9, supported by the respective mill beams l and 2 and having an angularity such that their surface is substantially normal to the line of reaction between the work rolls 3 and 4 and their backing rolls 5.
  • one of the hydraulic capsules 8 may be divided into two mutually isolated halves, 8a and 8b (FIG. 6).
  • Reaction rolls 10 are carried in carriers 11 pivoted to the mill structure along the same pivot axis as the carriers 6.
  • the position of the carriers 11 is adjusted by wedges 12 so as to ensure that the reaction between the work rolls and the reaction rolls is substantially parallel with the strip pass plane indicated at 14.
  • a latching bolt 16 is arranged to engage a backing roll carrier 6 at the position indicated by the line 15 in FIG. 1 to apply a variable lifting force on the carrier 6 so as to counteract or counterbalance in whole or in part the force applied to the carrier 6 by the hydraulic capsule 8.
  • the latching bolt 16, applied at its lower end (not shown, but similar to the latches 15 in the cited Patent) to a carrier 6 which requires counterbalancin'g, is pivotally connected to a lever 17, the movement of which is limited by upper and lower stops 18. Movement of the lever 17 is due to a hydraulic load cell 19 which is connected by tube 20 to the main hydraulic system of the mill so that the hydraulic pressure in the load cell is substantially constant.
  • the lever 17 is provided with a movable fulcrum 21, which is in contact with it at a point between its connection to the latch bolt 16 and its connection to the load cell 19.
  • the movable fulcrum 21 is controlled through a rod 22 which moves it lengthways in a guideway formed on a stationary member 23 of the main mill frame.
  • the member 23 can be part of member 1 or 2, through which the bolt 16 can slide as at 15 in FIG. 1, and the load cell 19 is engaged, as shown, between the lever 21 and another stationary part of the mill frame, e.g. a spaced part of member 1 or 2.
  • the rod 22, by means of which the longitudinal position of the fulcrum 21 is adjusted, may itself be moved manually, but is preferably moved in response to guides which sense the position of the edges of the strip being rolled. It is possible to provide a self-centering action in response to inward or outward wandering of the strip edge. In the case of outward wandering the loading of the strip edge applied through the relevant backing roll 5 may be increased to such an extent as to cause slight long edge and this would tend to steer the strip back to a central position. Since outward wandering at one edge will be accompanied by inward wandering at the other edge the loading at the other edge is simultaneously decreased to such extent that the second edge is rolled slightly short edge.
  • FIG. 4a A suitable hydraulic loading cell for use in the system of FIG. 2 and of FIG. 3 and also for loading individual carriers as at and 8d of FIG. 7 is illustrated in FIG. 4a and consists of a body 30 having a fluid space 31 provided with a pair of fluid connections 32, which form the only outlet for the space 31 which is otherwise enclosed by the body 30 and a flexible diaphragm 33 held in position on the body 30 by means of a clamp ring 34 held in position by studs 35.
  • the diaphragm 33 preferably carries a member 36 which has an external diameter very close to the internal diameter of the ring 34.
  • the thrust face of the member 36 ill usually be coated with a low friction material so as to permit it to be used to apply thrust directly to a lever.
  • the diaphragm 33 is replaced by an axially short enclosed rubber capsule 33a which fills the space 31 and is held in position by the inner edge of the ring 34, which overlaps it, a rubber reinforcing gasket 37 being interposed between the ring 34 and the capsule 33a.
  • a carrier-backing load cell is connected to a load cell 43, with which it forms a closed system; or as-in FIG. 7, to carrier-backing cells 8d requiring identical control may be connected together to a load cell 43, in a like closed system.
  • each load cell 43 is associated with a load cell 40, all of which are interconnected so as to be maintained at a common pressure conveniently the same high pressure as the carrierbacking cells 80.
  • the load cells 40 and 43 are positioned between an abutment surface 44 and a dividing beam 42.
  • the pressure transmitted by the hydraulic load cell 43 to its related carrier-backing load cell can be proportioned in relation to the high pressure transmitted to cell 40 and indeed the slave load cells 43 and their related carrier-backing load cells 8d can in this manner be loaded to any pressure between zero and the pressure of cells 40 or in.- deed to a higher pressure. Since the only functional connection between the device in FIG. 3 and the working parts of the mill is via the hydraulic liquid tubing from the cells 40, 43 (see FIG. 7), the elements 44, 48 can be part of any stationary structure in or near the mill frame. As will be understood, individual carrierbacking load cells are employed for the carriers 6 in the system of FIGS. 3 and 7, and may be employed (for example, instead of the long capsules of FIGS. 1 and 6) in other systems of the invention.
  • the backing rolls 5 are rotatably mounted in the carriers 6, it is inevitable that there be some degree of interval between adjacent backing rolls 5 and where these act directly on the work rolls 3 the areas where the work rolls are in contact with the backing rolls will acquire different surface characteristics from the areas out of contact with the backing rolls unless special measures are taken to prevent this.
  • the work rolls and the pinion stand through which torque is transmitted to them from the main motor are made so as to be longitudinally movable through a distance of some inches and the movement is produced in small increments of about one-eighth to one-fourth inch by a screw or similar linear drive mechanism which operates automatically each time the roll force is reduced to zero.
  • the system employs a low area plunger in the hydraulic system to relieve the system pressure immediately prior to the passage of the tail end of the rolling stock through the mill which acts as a normal off-loading safety device for the mill and this may also be utilized to initiate the movement of the sliding piston stand.
  • FIGS. 5a, 5b and 5c illustrate alternative arrangements of the mill of FIG. 1. Like parts are indicated by like reference numerals.
  • intermediate rolls 50 are interposed between the backing rolls 5 and the work rolls 3 and 4.
  • all operative roll axes lie in the same plane.
  • the intermediate rolls 50 and work rolls are retained in position by continuous reaction rolls 51 and 52.
  • the reaction rolls 51 and 52 are supported in continuous semi-circular plain bearings or alternatively by closely adjacent roller bearings.
  • the reaction rolls 51, 52 are thus held rigidly against sagging and against bending in the plane of the strip, those on the entry side of the mill being reactively fixed, but adjustable for roll positioning, whilst those on the exit side are carried in slides and are stabilized by preloading rams 53, 54.
  • the backing rolls 5 are offset from the vertical, the intermediate rolls 50 thus providing steady continuous horizontal reactions which are supported by the reaction rolls 52.
  • the total number of beams and reaction rolls so needed is reduced from those in FIG. 5a as indicated, and further, the reaction rolls 51 (FIG. 5a) are no longer required as the roller bearings 55 (FIGS. 5b and 5c) impinge directly onto the intermediate rolls 50.
  • the ends of the intermediate rolls 50 are held captive to prevent movement when the work rolls 3, 4 are removed, the latter being counterbalanced to maintain the roll gap. 7
  • a rolling mill comprising flexible upper and lower force to each of said carriers, each said row having its short backing rolls on a common axis and being disposed, and being the only such row so disposed, to apply substantial backing pressure to the corresponding work roll along a line which is on the opposite surface of such work roll from the bite of the work rolls, said mill also including reaction roll means consisting of reaction rolls each disposed in contact with a side of a work roll at a line approximately midway between said backing roll pressure line and said work roll bite, said reaction rolls being in contact with the work rolls in such a manner that the reaction is substantially parallel with the plane of the strip pass between the work rolls to absorb the loads which arise in at least one direction parallel to the strip during rolling.
  • reaction rolls are provided on both sides of each work roll and the axes of the backing rolls lie on the plane passing through the axes of the work rolls.
  • reaction roll means along a single axis is provided on one side of each work roll, the reaction on the other side of the work rolls being provided by the backing rolls which are so arranged that the line of application of pressure to the work rolls is offset from the plane passing through the axes of the work rolls, the amount of said offset for each work roll being such that the plane passing through said line and the bite of the work rolls makes a small angle with the plane passing through the axes of the work rolls, said angle being preferably less than 10.
  • a rolling mill as claimed in claim 4 wherein the means for applying a loading force to the carriers includes individual hydraulic load cells.
  • a rolling mill as claimed in claim 1 wherein the means for applying a loading force to the carriers includes individual hydraulic load cells. 7
  • a rolling mill as claimed in claim 3 wherein the means for applying -a loading force to the carriers includes individual hydraulic load cells.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Press Drives And Press Lines (AREA)
US00076566A 1969-10-03 1970-09-29 Flattening mill Expired - Lifetime US3724252A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4883369 1969-10-03

Publications (1)

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US3724252A true US3724252A (en) 1973-04-03

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US00076566A Expired - Lifetime US3724252A (en) 1969-10-03 1970-09-29 Flattening mill

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US (1) US3724252A (US20030199744A1-20031023-C00003.png)
CA (1) CA940351A (US20030199744A1-20031023-C00003.png)
DE (1) DE2048353C3 (US20030199744A1-20031023-C00003.png)
FR (1) FR2064133B1 (US20030199744A1-20031023-C00003.png)
GB (1) GB1329971A (US20030199744A1-20031023-C00003.png)
ZA (1) ZA706592B (US20030199744A1-20031023-C00003.png)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2507233A1 (de) * 1975-02-13 1976-08-26 Escher Wyss Ag Walzwerk
US4059002A (en) * 1976-10-20 1977-11-22 Schloemann- Siemag Aktiengesellschaft Multi-roll rolling mill stand
DE2907247A1 (de) * 1978-02-23 1979-08-30 Sendzimir Inc T Gruppenkaltwalzwerk
US4197731A (en) * 1978-05-19 1980-04-15 T. Sendzimir, Incorporated Rolling mill capable of increased torque transmission
US4724698A (en) * 1985-09-20 1988-02-16 Wean United Rolling Mills, Inc. Method and apparatus for rolling strip
US5839313A (en) * 1998-02-18 1998-11-24 Danieli United, A Division Of Danieli Corporation Rolling mill with intermediate crossed rolls background
US20100288007A1 (en) * 2008-03-04 2010-11-18 Shigeru Ogawa Rolling mill and rolling method for flat products of steel
US20110092349A1 (en) * 2008-06-05 2011-04-21 Hegenscheidt-Mfd Gmbh & Co. Kg Deep rolling head
US20110113848A1 (en) * 2009-11-16 2011-05-19 Quad Engineering Inc. Methods for reducing ridge buckles and annealing stickers in cold rolled strip and ridge-flattening skin pass mill

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3925408C1 (US20030199744A1-20031023-C00003.png) * 1989-08-01 1990-04-12 Sundwiger Eisenhuette Maschinenfabrik Grah & Co, 5870 Hemer, De
GB0404022D0 (en) * 2004-02-17 2004-03-31 Bronx Mfg Company Uk The Ltd Levelling machine and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2651954A (en) * 1949-09-27 1953-09-15 Frank P Dahlstrom Method of and means for rolling strip material
US2677978A (en) * 1950-03-22 1954-05-11 Frank P Dahlstrom Rolling mill
US2792730A (en) * 1953-05-14 1957-05-21 Baldwin Lima Hamilton Corp Metal forming
US2878778A (en) * 1951-02-16 1959-03-24 Kusters Eduard Apparatus for squeezing webs utilizing alternate hard and soft rolls on different axes
GB1134635A (en) * 1965-03-09 1968-11-27 Aluminium Lab Ltd Rolling mill
US3478559A (en) * 1966-05-20 1969-11-18 Natalis H Polakowski Flexible strip rolling mill

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909088A (en) * 1953-01-21 1959-10-20 Schloemann Ag Mounting for backing rolls
DE950903C (de) * 1955-08-20 1956-10-18 Banning A G J Vorrichtung zum axialen Einstellen von insbesondere mit Kalibern versehenen Walzen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2651954A (en) * 1949-09-27 1953-09-15 Frank P Dahlstrom Method of and means for rolling strip material
US2677978A (en) * 1950-03-22 1954-05-11 Frank P Dahlstrom Rolling mill
US2878778A (en) * 1951-02-16 1959-03-24 Kusters Eduard Apparatus for squeezing webs utilizing alternate hard and soft rolls on different axes
US2792730A (en) * 1953-05-14 1957-05-21 Baldwin Lima Hamilton Corp Metal forming
GB1134635A (en) * 1965-03-09 1968-11-27 Aluminium Lab Ltd Rolling mill
US3478559A (en) * 1966-05-20 1969-11-18 Natalis H Polakowski Flexible strip rolling mill

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2507233A1 (de) * 1975-02-13 1976-08-26 Escher Wyss Ag Walzwerk
US4059976A (en) * 1975-02-13 1977-11-29 Escher-Wyss Limited Rolling mill
US4059002A (en) * 1976-10-20 1977-11-22 Schloemann- Siemag Aktiengesellschaft Multi-roll rolling mill stand
DE2907247A1 (de) * 1978-02-23 1979-08-30 Sendzimir Inc T Gruppenkaltwalzwerk
US4197731A (en) * 1978-05-19 1980-04-15 T. Sendzimir, Incorporated Rolling mill capable of increased torque transmission
US4724698A (en) * 1985-09-20 1988-02-16 Wean United Rolling Mills, Inc. Method and apparatus for rolling strip
US5839313A (en) * 1998-02-18 1998-11-24 Danieli United, A Division Of Danieli Corporation Rolling mill with intermediate crossed rolls background
US20100288007A1 (en) * 2008-03-04 2010-11-18 Shigeru Ogawa Rolling mill and rolling method for flat products of steel
US8365567B2 (en) * 2008-03-04 2013-02-05 Nippon Steel Corporation Rolling mill and rolling method for flat products of steel
US20110092349A1 (en) * 2008-06-05 2011-04-21 Hegenscheidt-Mfd Gmbh & Co. Kg Deep rolling head
US20110113848A1 (en) * 2009-11-16 2011-05-19 Quad Engineering Inc. Methods for reducing ridge buckles and annealing stickers in cold rolled strip and ridge-flattening skin pass mill
US8365563B2 (en) 2009-11-16 2013-02-05 Quad Engineering, Inc. Methods for reducing ridge buckles and annealing stickers in cold rolled strip and ridge-flattening skin pass mill

Also Published As

Publication number Publication date
CA940351A (en) 1974-01-22
FR2064133B1 (US20030199744A1-20031023-C00003.png) 1973-11-23
DE2048353A1 (de) 1971-04-29
DE2048353B2 (de) 1980-03-27
GB1329971A (en) 1973-09-12
ZA706592B (en) 1972-04-26
FR2064133A1 (US20030199744A1-20031023-C00003.png) 1971-07-16
DE2048353C3 (de) 1980-11-27

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