US3605470A - Pressure assisted tension roller leveler - Google Patents

Pressure assisted tension roller leveler Download PDF

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Publication number
US3605470A
US3605470A US863657A US3605470DA US3605470A US 3605470 A US3605470 A US 3605470A US 863657 A US863657 A US 863657A US 3605470D A US3605470D A US 3605470DA US 3605470 A US3605470 A US 3605470A
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Prior art keywords
rolls
strip
roll
work roll
pressure
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US863657A
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English (en)
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Natalis H Polakowski
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    • 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
    • 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

  • This invention relates to the art of leveling or flattening metal strip and to apparatus for effecting same.
  • Tension roller leveling of metal strip represents an accepted procedure for flattening of malshaped metal strip afllicted with local waves, puckers and corrugations. These various distortions are a function of length differences between adjacent, parallel portions of the strip, when measured in the lengthwise direction. The larger the percentage difference, the more pronounced are the deviations from ideal flatness. To restore the latter, the short portions should be actually stretched to eliminate the aforesaid percent differences, for equalization of the short and long elements.
  • a longitudinal pulling load would be applied sufficient to exceed the yield stress of the material. In many instances this would represent a large value whereby this procedure becomes unsuitable for heavily cold rolled strip, due to the low residual ductility remaining in the metal.
  • the required pull can be reduced by making use of the combination of tension and bending, with the strip being bent by wrapping about a portion of the periphery of one or a sequence of hard flexing or work rollers. The sequence is such that the strip is flexed in alternate directions on adjacent rollers which is a practice familiar to those skilled in the art of roller leveling.
  • a conventional leveler designed to embody the above concepts would represent a rolling mill inasmuch as the distance between intermeshing rollers would be somewhat less than the thickness of the material. Moreover, because of the rigidity of the structure, the thicker portions of the strip would be reduced percentagewise more than the adjacent thinner portions. This would tend to create waviness and poor shape rather than to alleviate it.
  • FIG. 1 is a schematic sectional view of one embodiment of the roller assembly for carrying out the practice of this invention
  • FIG. 2 is a schematic sectional elevational view of another modification of roller assembly
  • FIG. 3 is a schematic sectional elevational view showing still further modifications of rollers and supports for carrying out the practice of this invention
  • FIG. 4 is a schematic sectional view of a base support for flexing rollers embodying the features of this invention.
  • FIG. 5 is a schematic elevational view of a roller assembly embodying the features of this invention.
  • the segment of the roller leveler illustrated in FIG. 1 shows a work roll 1 of small diameter supported by a backing roll 2 of much larger diameter with the backing roll 2 cradled on two parallel rows of roller bearings 3 mounted on axel 3 fixed for support on ribs 8.
  • the deflector rolls are cradled in three parallel rows of bearings 7 mounted on axles 7 fixed to a frame.
  • Pressure assistance is provided to the work roll 1 by means of a backup beam 9 on which the ribs 8 are supported with the beam actuated by hydraulic means such as a fluid cylinder and piston arrangement 10 for displacement of the lower roll assembly to apply the desired compressive forces at the point of contact between the work roll 1 and the strip.
  • the backup beam 9 is very rigid by reason of its large section modulus, the lower roll assembly supported by it can be regarded as rigid or non-flexible for all practical purposes. In such event, the desired flexibility across the machine is provided by making the deflector rolls 5 and 6 hollow, as illustrated in FIG. 1.
  • the desired flexibility can be obtained by the construction wherein the backup roll in the hollow roll, as illustrated in the succeeding flexing station in FIG. 1 by the backup roll 12.
  • the hollo'w backup roll 12 is cradled between bearings 13 while the deflector rolls 14 and 15 for the work roll 11 are cradled on bearings 16 mounted on ribs 16 with the lower cluster of deflector rolls being supported on backup beam 17 mounted for movement in the direction toward and away from the work roll by the pressure fluid operated piston and cylinder assembly or hydraulic jacks 18.
  • the desired lateral flexibility can be achieved by construction of the backup beams 9 or 17 to be relatively light and flexible and supporting the beams at numerous, usually equidistant points across the Width, with jacks, such as illustrated by the numerals 10 and 18.
  • the jacks can be separately actuated but it is preferred hydraulically to interconnect the jacks to provide a relatively uniform linear preload on the work roll and strip and a fixed pressure can be provided which is unaffected by variations in strip thickness thereby to avoid rolling as distinguished from a leveling action.
  • hydraulic jacks use can be made of mechanical jacks, such as screw or rack operated jacks, but only when transverse flexibility is provided by low-rigidity rolls such as 5, 6, and 12 in FIG. 1.
  • the complete leveler may consist of one or more stations of the type described followed preferably by a more conventional finish flattening stage where pressure assistance normal to the strip is not employed. This finishing portion which makes use of the flexing roll serves primarily to eliminate coil set and residual stresses from the metal.
  • FIG. 2 illustrates an alternative arrangement for pressure assisted roll leveling in accordance with the practice of this invention.
  • the work roll 19 is cradled between four rolls of larger dimension including deflector rolls 20 and a pair of backup rolls 20
  • the required flexibility can be provided by making the backup rolls 20 hollow and/or preferably by making the deflector rolls 20 hollow, as illustrated in the drawing.
  • the strip 21 is passed between the work roll 19 and deflector rolls 20 with the other details of the roll assemblies being the same as in the assembly previously described.
  • FIG. 3 resembles a standard roller leveler except that work rolls 23 cradled in bearings and deflector rolls 24 cradled in bearings 25 are in positive contact through the strip 22.
  • Jacks 26 of the construction previously described are mounted at least at the opposite ends of the backup beam 27 if the beam 27 is a stiff beam. If the beam is a flexible beam, then the jacks are provided at closely spaced intervals across the width of the beam. Extra flexibility is provided by the hollow work rolls 23.
  • Rolls 24 can be either solid or hollow.
  • FIG. 4 shows an arrangement for maximizing flexibility in which the backup beam is relatively flexible and has a number of ribs 29 which mount to continuous or sectional axles on which the bearings 31 in FIG. 4 or 16 and 13 in FIG. 1 or 25 in FIG. 3 are mounted for free rotational movement.
  • each segment, in a sectionalized azle or rib, is individually yieldingly urged with predetermined force for pressure assistance of the flex roll in flattening with the aid of a series of hydraulic jacks 32.
  • FIG. 5 illustrates an arrangement similar to that in FIG. 1 but modified so as to secure a tangential, free from flexure, entry of strip 33 into the nip of rolls 34 and 35.
  • Such straight entry is particularly desirable in processing materials prone to form Luders lines or leveler breaks, such as annealed low carbon steel or hot-dip galvanized steel strip.
  • the Luders lines form ordinarily upon bending the entering strip around a portion of the periphery of roll 35 and before the radial pressure is applied to it by hydraulic cylinders 38 via backing rolls 37.
  • the details of the complete backup structure may follow those in FIG. 1 and need not be repeated.
  • rolls 35 and 36 can be hollow for reasons already explained. It will be recognized, of course, that to comply with the principle expressed in FIG. 5, the first leveler station in FIG. 1 must be inclined under a suitable angle.
  • a pressure assisted tension roller leveler comprising a small diameter work roll, a pair of larger diameter flexure rollers mounted for rotational movement about axes parallel with the axis of the work roll with the peripheral surfaces of the flexure rollers spaced one from the other by an amount less than the diameter of the work roll while cradling the work roll therebetween for flexure of metal strip over a portion of the periphery of the work roll during pasage of the metal strip under tension between the work and flexure rolls, one set of bearing rolls cradling the flexure rolls to support the flexure rolls for rotational movement, backup rolls engaging the work roll on the side opposite the strip, another set of bearing rolls cradling the backup rolls to support the backup rolls for rotational movement, one frame member mounting the one set of bearing rolls and another frame member mounting the other set of bearing rolls, pressure generating means operatively engaging at least one of said frame members for applying pressure between said Work and flexure rolls normal to the strip passed therebetween, and means for inducing transverse flexibility in at least one of
  • a pressure assisted tension roller leveler as claimed in claim 1 in which the flexure rolls are in the form of hollow tubular members to provide the means for the transverse flexibility.
  • both the backup roll and the flexure rolls are in the form of hollow tubular members to provide the means for the transverse flexibility.
  • a pressure assisted tension roller leveler as claimed in claim 1 in which at least one of the sets of bearing rolls is subdivided crosswise into separate segments and in which the means for inducing transverse flexibility comprises means operatively engaging the separate segments for the transmission of pressure therethrough to the work and fiexure rolls.
  • a pressure assisted tension roller leveler as claimed in claim 5 in which the means operatively engaging the separate segments comprises fluid pressure means interconnected for transmission of uniform pressure to the separate segments.
  • a pressure assisted tension roller le veler as claimed in claim 1 in which at least one of the rolls including the backup roll and the flexure rolls is supported on continuous axles of low rigidity as the means for providing transverse flexibility.
  • a pressure assisted tension roller leveler as claimed in claim 1 in which the strip is introduced between the work roll and flexure roll in a direction tangential to said rolls at the point of engagement between the work and flexure rolls.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
US863657A 1969-01-27 1969-10-03 Pressure assisted tension roller leveler Expired - Lifetime US3605470A (en)

Applications Claiming Priority (2)

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US79398169A 1969-01-27 1969-01-27
US86365769A 1969-10-03 1969-10-03

Publications (1)

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US3605470A true US3605470A (en) 1971-09-20

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US863657A Expired - Lifetime US3605470A (en) 1969-01-27 1969-10-03 Pressure assisted tension roller leveler

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US (1) US3605470A (enrdf_load_stackoverflow)
GB (1) GB1296466A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777532A (en) * 1971-07-09 1973-12-11 Berg Und Walzwerk Maschinen Gm Method of and apparatus for extending and reducing thickness of a metallic band
US3828599A (en) * 1971-11-09 1974-08-13 Prod Machinery Corp Apparatus and method for leveling metal strip
US3834202A (en) * 1973-04-24 1974-09-10 Toyo Kohan Co Ltd Metal strip straightening machine
US3839888A (en) * 1972-11-06 1974-10-08 Wean United Inc Tension levelling of strip
US3841132A (en) * 1971-09-14 1974-10-15 Lysaght Ltd John Method of flattening metal strip exhibiting a discontinuous yield point and suppressing the discontinuous yield point
US3958439A (en) * 1973-05-31 1976-05-25 Toyo Kohan Co., Ltd. Method for recovering ductility of a cold rolled metal strip
DE2746788A1 (de) * 1976-11-17 1978-05-18 Tscheljabinskij Politekhn I Im Verfahren zum walzen von metallband und walzwerk zu dessen durchfuehrung
FR2418041A1 (fr) * 1978-02-22 1979-09-21 Clesid Sa Dispositif de montage et de demontage des rouleaux d'une machine a planer une bande de metal sous tension
US4633697A (en) * 1985-08-16 1987-01-06 Mesta Engineering Company Plate levelling machine
US5953946A (en) * 1997-03-03 1999-09-21 Betriebsforschungsinstitut Vdeh-Institut Fur Angewandte Forschung Gmbh Apparatus for bend-straightening metal strip
US6006573A (en) * 1996-05-10 1999-12-28 Van Merksteijn; Jacobus Lambertus Driven ductility machine
WO2007090663A1 (de) * 2006-02-10 2007-08-16 Betriebsforschungsinstitut VDEh-Institut für angewandte Forschung GmbH Richtvorrichtung und richtverfahren für ein metallband
US20090282883A1 (en) * 2008-05-16 2009-11-19 Andreas Noe Method of and apparatus for leveling strip
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
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
CN103008400A (zh) * 2012-12-03 2013-04-03 太原重工股份有限公司 一种伸缩旋转液压装置及液压锁紧装置
CN110947797A (zh) * 2018-09-27 2020-04-03 上海运盛制版有限公司 一种防变形的版辊钢坯校圆机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4528830A (en) * 1982-06-30 1985-07-16 Sumitomo Metal Industries, Ltd. Method for changing widthwise distribution of thickness of metal strip
CN102319769A (zh) * 2011-09-23 2012-01-18 中冶南方工程技术有限公司 高刚度拉伸弯曲矫直机辊盒

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777532A (en) * 1971-07-09 1973-12-11 Berg Und Walzwerk Maschinen Gm Method of and apparatus for extending and reducing thickness of a metallic band
US3841132A (en) * 1971-09-14 1974-10-15 Lysaght Ltd John Method of flattening metal strip exhibiting a discontinuous yield point and suppressing the discontinuous yield point
US3828599A (en) * 1971-11-09 1974-08-13 Prod Machinery Corp Apparatus and method for leveling metal strip
US3839888A (en) * 1972-11-06 1974-10-08 Wean United Inc Tension levelling of strip
US3834202A (en) * 1973-04-24 1974-09-10 Toyo Kohan Co Ltd Metal strip straightening machine
US3958439A (en) * 1973-05-31 1976-05-25 Toyo Kohan Co., Ltd. Method for recovering ductility of a cold rolled metal strip
DE2746788A1 (de) * 1976-11-17 1978-05-18 Tscheljabinskij Politekhn I Im Verfahren zum walzen von metallband und walzwerk zu dessen durchfuehrung
FR2371246A1 (fr) * 1976-11-17 1978-06-16 Ch Polt I Procede de laminage de bandes metalliques et laminoir pour la mise en oeuvre dudit procede
US4257252A (en) * 1976-11-17 1981-03-24 Vydrin Vladimir N Method and mill for rolling metal strip
US4267720A (en) * 1976-11-17 1981-05-19 Vydrin Vladimir N Mill for rolling metal strips
FR2418041A1 (fr) * 1978-02-22 1979-09-21 Clesid Sa Dispositif de montage et de demontage des rouleaux d'une machine a planer une bande de metal sous tension
US4633697A (en) * 1985-08-16 1987-01-06 Mesta Engineering Company Plate levelling machine
US6006573A (en) * 1996-05-10 1999-12-28 Van Merksteijn; Jacobus Lambertus Driven ductility machine
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
WO2007090663A1 (de) * 2006-02-10 2007-08-16 Betriebsforschungsinstitut VDEh-Institut für angewandte Forschung GmbH Richtvorrichtung und richtverfahren für ein metallband
US20090282883A1 (en) * 2008-05-16 2009-11-19 Andreas Noe Method of and apparatus for leveling strip
US8291738B2 (en) * 2008-05-16 2012-10-23 Bwg Bergwerk-Und Walzwerk-Maschinenbau Gmbh Method of and apparatus for leveling strip
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
CN103008400A (zh) * 2012-12-03 2013-04-03 太原重工股份有限公司 一种伸缩旋转液压装置及液压锁紧装置
CN110947797A (zh) * 2018-09-27 2020-04-03 上海运盛制版有限公司 一种防变形的版辊钢坯校圆机

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