US3841132A - Method of flattening metal strip exhibiting a discontinuous yield point and suppressing the discontinuous yield point - Google Patents

Method of flattening metal strip exhibiting a discontinuous yield point and suppressing the discontinuous yield point Download PDF

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Publication number
US3841132A
US3841132A US00294983A US29498372A US3841132A US 3841132 A US3841132 A US 3841132A US 00294983 A US00294983 A US 00294983A US 29498372 A US29498372 A US 29498372A US 3841132 A US3841132 A US 3841132A
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US
United States
Prior art keywords
strip
roll
work roll
reaction
nip
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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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US00294983A
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English (en)
Inventor
N Kuhn
G Harvey
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John Lysaght Australia Pty Ltd
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John Lysaght Australia Pty Ltd
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    • 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
    • B21B1/222—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 in a rolling-drawing process; in a multi-pass mill
    • 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
    • B21D1/05—Stretching combined with rolling

Definitions

  • ABSTRACT A strip flattening apparatus having a work roll and two reaction rolls which bear against the work roll to define a first and second nip.
  • a pressure roll also contacts the work roll, loading it toward the reaction rolls so that there is more pressure at the first nip than at the second.
  • Means are provided to cause the strip to enter the first nip at an angle of 2 20 to the tangent in the sense required to bend the strip about the work roll.
  • metal strip After cold rolling and annealing, metal strip often does not exhibit the degree of flatness required. This is evidenced by waviness in parts of the strip when it is laid on a flat surface, and by lateral curvature that may occur in narrow strips slit from a wider coil.
  • microfluting can be overcome by the known art of temper rolling the annealed strip prior to roller-levelling.
  • a rolling extension of approximately 1 percent is sufficient to suppress the discontinuous yield point of the strip and thus prevent the formation of microfluting during subsequent roller-levelling.
  • this procedure necessitates two processes, two costly items of capital equipment, and is difficult to accomplish in a continuous annealing and galvanizing line.
  • An object of this invention is to provide a method and apparatus whereby a metal strip exhibiting a discontinuous yield, for'example annealed ferrous strip, may be flattened without the formation of-a microfluting pattern.
  • the invention attains that object by providing a novel roll arrangement which subjects the strip simultaneously to the combined effect of tensile, bending and compressive stresses whereby the compressive stresses control the yield behavior'rather than cause yielding as in the case of temper rolling.'- .1
  • a microfluting-free flat strip is produced with only a small amount of plastic deformation to reduce deterioration in the mechanical properties. of the strip by strain ageing.
  • the present invention consists in a strip flattening apparatus comprising a work-roll, a first reaction'roll defininga first nip ,with said work roll, a second reaction roll. defining a second be flattened through said nips and about that portion of the work roll between the nips while maintaining the strip under tension, at least one pressure roll contacting the work roll and loading it toward the two reaction rolls and means for determining the line of approach of the strip to the first nip such that the strip enters the first nip at anangle to the tangent within the range of from 2 to 20 in the sense required to bend the strip about the work roll; the arrangement being such that there is a greater reaction force between the work roll and the first reaction roll than there is between the work roll and the second reaction roll.
  • it consists in a method of flattening and suppressing the discontinuous yield point of a metal strip, comprising the steps of bending the strip elastically while under longitudinal tension, and thereafter transversely compressing the strip while maintaining the bending and tensile loads thereon, in a mannersuch that the strip is simultaneously subjected to bending, longitudinal tension and through thickness compression.
  • That diagram represents an end view of the rolls of a fattening apparatus, arranged in a disposition enabling the method of the invention to be put into effect.
  • the strip passes around a work roll 1. lnterroll pressure isapplied to it between roll 1 and reaction rolls 2 and 3 by a pressure roll 5.
  • the pressure on the strip in the nip of rolls 1 and 2 is high enough'in conjunction with the bending stresses tov deform the strip suffi 'ciently to suppress the discontinuous yield.
  • the interroll pressure between rolls 1 and 3 is less than that be-' tween rolls 1 and 2 and preferably is low enough so that no further rolling deformation occurs in the strip as it passes between rolls 1 and 3. The amount of plastic deformation of the strip can thus be kept to theminimum requiredv to produce flat strip free from microfluting.
  • means to draw a metal strip to and rolls 1 and-'3 is preferablya chieved by offsetting the pressure roll 5 by an angle a, from the line'bisecting I r the angle'formed by lines passing through the centers of rolls 31 and 2 and rolls 1 and 3.
  • the direction of this offset is such that'the pressure applied to the strip-between rolls 1 and 2 is larger than that between'rolls 1 and 3.
  • the magnitude of the offset angle a will depend onthe difference in pressure required at the two nips, theroll diameters, their geometrical arrangement and strip tension. However it must be sufficiently small so that-roll'l operates in a stable configuration.
  • the strip preferably enters theleveller sothat it makes an angle (a with the tangent to roll 1 .at thenip between rolls 1 and 2.
  • the stress state in the strip in this nip isone' of combined bending, longitudinal tension, and inter-roll or through thickness compression.
  • the angle a must be small enough so that the strip does not microflute before it reaches the nip of rolls 1 and 2. The angle therefore depends on strip thickness, yield stress, and the applied tension.
  • the angle 01 will normally lie within the range 2 to
  • the inter-roll pressure between rolls 1 and 2 must be high enough so that in conjunction with the bending stresses existing in the strip at this pressure point, the material is deformed an amount sufficient to suppress the discontinuous yield point of the strip, at least in the surface layers.
  • the required deformations usually result in extensions within the range 0.2 to 1 percent.
  • this unit may be followed by subsequent flexing and/or levelling rolls in any configurationand with any number of subsequent rolls. These may be used to obtain further levelling action, or to remove coil set, otherwise known as cross-bow or gutter.
  • the reaction rolls may be of different diameters. Further back-up rolls 4 may also be required particularly when processing wide strip.
  • the pressure and reaction rolls may be arranged using any suitable configuration and may be provided with means for bending if considered necessary and may be supported in such a way as to apply a uniform or any other desirable pressure distribution across the strip width between rolls 1 and 2.
  • a strip flattening apparatus comprising a work roll, a first reaction roll with its axis parallel to the axis of the work roll to define a first nip with said work roll, a second reaction roll with its axis parallel to the axis of the work roll to define a second nip with said work roll, means to draw a metal strip to be flattened through said nips and about that portion of the work roll between the nips while maintaining the strip under tension, at least one pressure roll contacting the work roll and loading it toward the two reaction rolls and means to control the line of approach of the strip to the first nip such that the strip enters the first nip'at an angle to the tangent within the range of from 2 to 20 in the sense required to bend the strip about the work roll; the arrangement being such that there is a greater reaction force between the work roll and the first reaction roll than there is between thework roll and the second reaction roll.
  • Strip flattening apparatus wherein the greater reaction force between the work roll and the first reaction roll by comparison with the reaction force between the work roll and the second reaction roll is caused by positioning a single pressure roll so that its axis lies to one side of the bi-sector of the angle between the lines joining the center of the work roll with the respective centers of the reaction rolls.
  • Strip flattening apparatus according to claim 1 in which the ratio of the'diameter of the work roll to the thickness of the strip is within the range of from 40 to 200.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
US00294983A 1971-09-14 1972-10-04 Method of flattening metal strip exhibiting a discontinuous yield point and suppressing the discontinuous yield point Expired - Lifetime US3841132A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU46551/72A AU466254B2 (en) 1971-09-14 1971-09-14 Method of flattening metal strip exhibiting a discontinuous yield point and suppressing the discontinuous yield point
AUPA663471 1971-10-14

Publications (1)

Publication Number Publication Date
US3841132A true US3841132A (en) 1974-10-15

Family

ID=25627596

Family Applications (1)

Application Number Title Priority Date Filing Date
US00294983A Expired - Lifetime US3841132A (en) 1971-09-14 1972-10-04 Method of flattening metal strip exhibiting a discontinuous yield point and suppressing the discontinuous yield point

Country Status (6)

Country Link
US (1) US3841132A (enExample)
AU (1) AU466254B2 (enExample)
CA (1) CA985610A (enExample)
DE (1) DE2249568C3 (enExample)
FR (1) FR2156175B1 (enExample)
GB (1) GB1373729A (enExample)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353237A (en) * 1979-04-17 1982-10-12 Mitsubishi Jukogyo Kabushiki Kaisha Method of rolling strip
US5724845A (en) * 1996-08-12 1998-03-10 Kawasaki Steel Corporation Bowing correction apparatus for temper rolling mill
US5953946A (en) * 1997-03-03 1999-09-21 Betriebsforschungsinstitut Vdeh-Institut Fur Angewandte Forschung Gmbh Apparatus for bend-straightening metal strip
US20070251289A1 (en) * 2006-04-28 2007-11-01 Medtronic, Inc. System and method for producing component for medical device
US20100146757A1 (en) * 2008-12-11 2010-06-17 The Material Works, Ltd. Method and Apparatus for Breaking Scale from Sheet Metal with Recoiler Tension and Rollers Adapted to Generate Scale Breaking Wrap Angles
US20110048623A1 (en) * 2006-05-08 2011-03-03 Xxentria Technology Materials Co., Ltd. Method for making a laminate
CN102971096A (zh) * 2010-06-23 2013-03-13 矿山机械和轧钢机械制造有限公司 拉伸弯曲矫直设备
EP4047105A1 (de) 2021-02-17 2022-08-24 ThyssenKrupp Steel Europe AG Warmgewalztes stahlflachprodukt und verfahren zur herstellung eines warmgewalzten stahlflachprodukts

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19741109C2 (de) * 1997-09-18 2000-07-13 Kemper Kurt Vorrichtung zur Nachbearbeitung von Rundmaterial
DE102006006530A1 (de) * 2006-02-10 2007-08-16 Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH Richtvorrichtung und Richtverfahren für ein Metallband

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392323A (en) * 1941-12-20 1946-01-08 Joseph W Koss Rolling strip metal
US3238756A (en) * 1961-05-03 1966-03-08 Gen Electric Material forming method and apparatus
US3253445A (en) * 1962-07-09 1966-05-31 Metal Box Co Ltd Apparatus for rolling strip metal
US3427848A (en) * 1965-08-23 1969-02-18 Forges De La Loire Cie Des Ate Devices for cold-rolling and planishing metal sheet
US3605470A (en) * 1969-01-27 1971-09-20 Natalis H Polakowski Pressure assisted tension roller leveler
US3616669A (en) * 1969-06-13 1971-11-02 United Eng Foundry Co Method of and apparatus for rolling flat strip

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2742949A (en) * 1951-06-05 1956-04-24 Einar W Nilsson Leveler apparatus and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392323A (en) * 1941-12-20 1946-01-08 Joseph W Koss Rolling strip metal
US3238756A (en) * 1961-05-03 1966-03-08 Gen Electric Material forming method and apparatus
US3253445A (en) * 1962-07-09 1966-05-31 Metal Box Co Ltd Apparatus for rolling strip metal
US3427848A (en) * 1965-08-23 1969-02-18 Forges De La Loire Cie Des Ate Devices for cold-rolling and planishing metal sheet
US3605470A (en) * 1969-01-27 1971-09-20 Natalis H Polakowski Pressure assisted tension roller leveler
US3616669A (en) * 1969-06-13 1971-11-02 United Eng Foundry Co Method of and apparatus for rolling flat strip

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353237A (en) * 1979-04-17 1982-10-12 Mitsubishi Jukogyo Kabushiki Kaisha Method of rolling strip
US5724845A (en) * 1996-08-12 1998-03-10 Kawasaki Steel Corporation Bowing correction apparatus for temper rolling mill
US5953946A (en) * 1997-03-03 1999-09-21 Betriebsforschungsinstitut Vdeh-Institut Fur Angewandte Forschung Gmbh Apparatus for bend-straightening metal strip
EP0865839A3 (de) * 1997-03-03 2002-01-16 BETRIEBSFORSCHUNGSINSTITUT VDEh, INSTITUT FÜR ANGEWANDTE FORSCHUNG GmbH Vorrichtung zum Biegerichten von Metallband
US20070251289A1 (en) * 2006-04-28 2007-11-01 Medtronic, Inc. System and method for producing component for medical device
US20110048623A1 (en) * 2006-05-08 2011-03-03 Xxentria Technology Materials Co., Ltd. Method for making a laminate
US8440038B2 (en) * 2006-05-08 2013-05-14 Xxentria Technology Materials Co., Ltd. Method for making a laminate
US20100146757A1 (en) * 2008-12-11 2010-06-17 The Material Works, Ltd. Method and Apparatus for Breaking Scale from Sheet Metal with Recoiler Tension and Rollers Adapted to Generate Scale Breaking Wrap Angles
US8707529B2 (en) 2008-12-11 2014-04-29 The Material Works, Ltd. Method and apparatus for breaking scale from sheet metal with recoiler tension and rollers adapted to generate scale breaking wrap angles
CN102971096A (zh) * 2010-06-23 2013-03-13 矿山机械和轧钢机械制造有限公司 拉伸弯曲矫直设备
CN102971096B (zh) * 2010-06-23 2015-02-04 矿山机械和轧钢机械制造有限公司 拉伸弯曲矫直设备
EP4047105A1 (de) 2021-02-17 2022-08-24 ThyssenKrupp Steel Europe AG Warmgewalztes stahlflachprodukt und verfahren zur herstellung eines warmgewalzten stahlflachprodukts

Also Published As

Publication number Publication date
GB1373729A (en) 1974-11-13
FR2156175A1 (enExample) 1973-05-25
DE2249568B2 (de) 1979-10-31
DE2249568C3 (de) 1980-07-10
AU4655172A (en) 1974-03-21
CA985610A (en) 1976-03-16
AU466254B2 (en) 1975-10-23
FR2156175B1 (enExample) 1977-08-05
DE2249568A1 (de) 1973-04-19

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