US3535902A - Method and apparatus for straightening sheet materials - Google Patents

Method and apparatus for straightening sheet materials Download PDF

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Publication number
US3535902A
US3535902A US709351A US3535902DA US3535902A US 3535902 A US3535902 A US 3535902A US 709351 A US709351 A US 709351A US 3535902D A US3535902D A US 3535902DA US 3535902 A US3535902 A US 3535902A
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Prior art keywords
straightening
sheet
rollers
transverse
sheets
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Expired - Lifetime
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US709351A
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English (en)
Inventor
Theodor Sevenich
Peter Zens
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Fried Krupp AG Hoesch Krupp
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Hoesch AG
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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
    • B21D1/02—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 a method and an apparatus for straightening sheet materials and especially sheet metal which has a curvature extending transverse to the direction in which the material has been rolled in a hot-rolling mill.
  • these sheets are generally passed through straightening machines which may be of different types.
  • the sheet material is passed between two superimposed rows of cylindrical straightening rollers which are rotatable in opposite directions and apply a pressure upon the opposite sides of the sheet.
  • Another known type of these straightening machines comprises cylindrical straightening rollers which are bent by means of bracing rollers so that the sheet material running therethrough will be stretched longitudinally at certain areas whereby the waviness of adjacent areas of the sheet will be eliminated.
  • Still another known type of straightening machines comprises short cambered straightening rollers which may be shifted axially on their shafts and act upon the particular areas of the sheet which are to be straightened.
  • the invention provides that the sheets or strips to be straightened are given an initial stress contrary to the transverse curvature and are deformed beyond the elastic limit of the sheet material by a rolling operation in the longitudinal direction in which they are produced by the rolling train of the mill.
  • the extent to which the elastic limit of the material is to be exceeded in the transverse direction of the sheet is preferably determined by the sum of the transverse components of the longitudinal stresses and of the initial stress itself which the sheet has in its transverse direction.
  • the stresses which according to the invention are produced in the transverse direction of the sheet should, however, preferably be kept far :below the elastic limit of the material since they are not needed to effect a plastic deformation of the material in the transverse direction.
  • the transverse curvature of the sheets is therefore eliminated merely by plastically deforming the material in the longitudinal direction to such an extent that the transverse components of the stresses which are produced by this longitudinal plastic deformation will be sufficiently increased by the transverse stresses themselves.
  • the invention provides an apparatus which comprises two rows of associated straightening rollers which are disposed within two different levels and are provided with concave or convex outer surfaces, respectively.
  • the straightening rollers with convex surfaces are preferably provided in the upper row and the straightening rollers with concave surfaces in the lower row since the sheets are preferably passed through these rollers with their transverse curvature extending in the upward direction. Since according to the new method only a small stress is to be produced in the transverse direction of the sheet or strip material, the degree of curvature in the axial direction of the straightening rollers is prefera bly made very large.
  • the diameter of these straightening rollers and their distances from each other therefore have to be only slightly larger than those of the conventional cylindrical straightening rollers in order to attain the required permanent plastic deformation of the sheets in their longitudinal rolling direction for completely straightening the sheets in all directions.
  • FIG. 1 shows a perspective view of a complete set of straightening rollers according to the invention
  • FIG. 2 shows a perspective view of a plate, for example, of sheet metal which has been wound from a coil and cut off transversely;
  • FIG. 3 shows a perspective view of a set of straightening rollers consisting of two upper convex rollers and one lower concave roller for carrying out the first stage of the straightening operation;
  • FIG. 4 shows the lines of force in a sheet while the sheet is being bent about the lower concave straightening roller according to FIG. 3;
  • FIG. 6 shows a perspective view of a set of straightening rollers consisting of one upper convex and two lower concave rollers for carrying out the second stage of the straightening operation; while FIG. 6 shows the lines of force in a sheet, for example, of metal, while the sheet is being bent about the upper convex straightening roller according to FIG. 5.
  • the invention For carrying out the new method of straightening sheets or strips, for example, of metal, the invention provides a set of straightening rollers, as diagrammatically illustrated in FIG. 1, which comprises a row of lower rollers 1 with concave outer surfaces and a row of upper rollers 2 with convex outer surfaces. All of these straightening rollers l and 2 are ground so as to have substantially equal concave or convex curvatures 0, respectively, as indicated in FIG. 3.
  • FIG. 2 illustrates a sheet, for example, of metal 3 which has been unwound from a coil and has then been cut transversely to the desired length.
  • This sheet has a curvature a in its longitudinal direction and a curvature b in the transverse direction. Both these curvatures a and b are to be straightened so that the sheet will be completely plane.
  • the invention provides that in a first working stage the sheet is passed through the set of straightening rollers as shown in FIG. 3. This first part of the straightening operation gives the sheet an initial tension in the direction opposite to the original transverse curvature b by bending it for the distance b+c.
  • the stress component D on the upper side of the sheet is a compressive stress, it is added to the initial stress A while the stress component D is a tensile stress and therefore likewise added to the initial stress A If the sheet is plastically deformed to a sufficient extent in the longitudinal direction of the stresses C and C the sums of the stresses of the components A and D and of the components A and D will also exceed the elastic limit of the material in the transverse direction and a plastic deformation of the sheet will take place in the transverse direction which eliminates the original curvature b of the sheet.
  • the curvature a in the longitudinal direction of the sheet will, however, at first be increased by the straightening operation by means of the straightening rollers according to FIG. 3.
  • the stresses G and G which are then produced are indicated in FIG. 6 by double open arrow heads. These longitudinal stresses G and G produce the transverse components H and H in the transverse direction, as indicated in FIG. 6 by triple open arrow heads. As may also be seen in FIG. 6, the stresses E and E extend in the opposite direction to the transverse components H and H Therefore the transverse components H and H will reach the elastic limit of the material only after the latter has been plastically deformed in the direction of the longitudinal stresses G and G to a greater extent than that which occurs during the passage of the sheet through the roller arrangement according to FIG. 3 in which the transverse components D and D are formed which are produced by the longitudinal stresses B and B as indicated in FIG. 4. The roller arrangement according to FIG.
  • the considerable advantage of the straightening method according to the present invention over the straightening methods as heretofore known is particularly the fact that the transverse curvature of a sheet or strip of metal of other material may be completely eliminated by passing it only once through the set of straightening rollers according to FIG. 1. It is another advantage of the new method that it also permits the different transverse curvatures of sheets and strips of different thicknesses to be completely eliminated by means of the same uniformly ground straightening rollers and by merely adjusting the upper and lower straightening rollers relative to each other so as to exert the required pressures upon the sheets or strips in accordance with their different thicknesses. If the method according to the invention is applied, it is therefore no longer necessary to carry out any additional expensive straightening operations outside of the cutting apparatus.
  • An apparatus for straightening sheets or strips of metal or other materials having at least a curvature transverse to their longitudinal direction comprising a set of at least two upper straightening rollers and a set of at least two lower straightening rollers rotatable about substantially parallel axes, each roller of one set being positioned closely adjacent a roller of the other set, each roller of one of said sets having a concave outer surface and each roller of the other set having a convex outer surface, whereby when said sheets or strips are passed in a continuous movement between said two sets of rollers in said longitudinal direction and substantially transverse to the axes of said rollers, they are straightened in the longitudinal and transverse directions thereof.
  • rollers of said upper row have a convex outer surface and said rollers of said lower row have a concave outer surface.
  • one of said sets has at least three rollers, two of said three rollers cooperating with each of the rollers of the other set.
  • each roll of one set has two rolls of another set cooperating therewith and the axes of the rolls of each set are located substantially in a single plane, the planes being parallel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
US709351A 1967-03-06 1968-02-29 Method and apparatus for straightening sheet materials Expired - Lifetime US3535902A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEH0062031 1967-03-06
DEH0063976 1967-09-22

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US3535902A true US3535902A (en) 1970-10-27

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BE (1) BE711733A (is")
FR (1) FR1555335A (is")
GB (1) GB1217013A (is")

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680343A (en) * 1970-03-05 1972-08-01 Allegheny Ludlum Ind Inc Apparatus for leveling thin strip
US4145905A (en) * 1977-12-02 1979-03-27 Marathon Manufacturing Company Method and apparatus for controlling bow in venetian blind slats
US4528830A (en) * 1982-06-30 1985-07-16 Sumitomo Metal Industries, Ltd. Method for changing widthwise distribution of thickness of metal strip
US4959986A (en) * 1989-09-01 1990-10-02 Dana Corporation Apparatus for cutting a wide sheet of metal material into a plurality of narrow strips
US5341664A (en) * 1992-09-10 1994-08-30 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Roll set for thin metal strip
RU2138354C1 (ru) * 1998-02-10 1999-09-27 Открытое акционерное общество "Уральский завод тяжелого машиностроения" Способ правки листового проката
US20140345787A1 (en) * 2013-05-23 2014-11-27 Datacard Corporation Card de-bowing mechanism
CN109290394A (zh) * 2018-09-26 2019-02-01 王敏侠 一种提高板材整平效果的方法
CN109290395A (zh) * 2018-09-26 2019-02-01 王敏侠 一种板材整平机
US10370749B2 (en) * 2016-09-27 2019-08-06 Novelis Inc. Systems and methods for threading a hot coil on a mill
CN113561457A (zh) * 2021-08-02 2021-10-29 安徽纳赫智能科技有限公司 一种汽车内饰件的矫形设备
US11785678B2 (en) 2016-09-27 2023-10-10 Novelis Inc. Rotating magnet heat induction

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2687334B1 (fr) * 1992-02-17 1996-05-31 Lorraine Laminage Planeuse pour toles.
CN102794332A (zh) * 2012-07-02 2012-11-28 麻斌 钢板龟背缺陷后置式改良凹凸辊矫直机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1584499A (en) * 1924-02-16 1926-05-11 Zachhuber Franz Method of and means for rendering metal bands supple
US1854021A (en) * 1930-07-11 1932-04-12 Union Sandpaper Company Machine for flexing sheet abrasives
US2240548A (en) * 1937-08-03 1941-05-06 Cairns Corp Apparatus for forming curved sheets
US2337047A (en) * 1939-06-19 1943-12-21 Acme Steel Co Method of and apparatus for stretching metal strips
US2348539A (en) * 1941-12-06 1944-05-09 American Steel & Wire Co Device for stretching metallic strip material
US2470235A (en) * 1944-08-31 1949-05-17 Benjamin S Burrell Coiling machine for strip material
US2692003A (en) * 1951-11-07 1954-10-19 Bethlehem Steel Corp Apparatus for forming metal strips of curved cross-sections
US2854056A (en) * 1951-12-08 1958-09-30 Acme Steel Co Method of treating metal strip for the formation of venetian blind slats and the like

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1584499A (en) * 1924-02-16 1926-05-11 Zachhuber Franz Method of and means for rendering metal bands supple
US1854021A (en) * 1930-07-11 1932-04-12 Union Sandpaper Company Machine for flexing sheet abrasives
US2240548A (en) * 1937-08-03 1941-05-06 Cairns Corp Apparatus for forming curved sheets
US2337047A (en) * 1939-06-19 1943-12-21 Acme Steel Co Method of and apparatus for stretching metal strips
US2348539A (en) * 1941-12-06 1944-05-09 American Steel & Wire Co Device for stretching metallic strip material
US2470235A (en) * 1944-08-31 1949-05-17 Benjamin S Burrell Coiling machine for strip material
US2692003A (en) * 1951-11-07 1954-10-19 Bethlehem Steel Corp Apparatus for forming metal strips of curved cross-sections
US2854056A (en) * 1951-12-08 1958-09-30 Acme Steel Co Method of treating metal strip for the formation of venetian blind slats and the like

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680343A (en) * 1970-03-05 1972-08-01 Allegheny Ludlum Ind Inc Apparatus for leveling thin strip
US4145905A (en) * 1977-12-02 1979-03-27 Marathon Manufacturing Company Method and apparatus for controlling bow in venetian blind slats
US4528830A (en) * 1982-06-30 1985-07-16 Sumitomo Metal Industries, Ltd. Method for changing widthwise distribution of thickness of metal strip
US4959986A (en) * 1989-09-01 1990-10-02 Dana Corporation Apparatus for cutting a wide sheet of metal material into a plurality of narrow strips
US5341664A (en) * 1992-09-10 1994-08-30 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Roll set for thin metal strip
RU2138354C1 (ru) * 1998-02-10 1999-09-27 Открытое акционерное общество "Уральский завод тяжелого машиностроения" Способ правки листового проката
US20140345787A1 (en) * 2013-05-23 2014-11-27 Datacard Corporation Card de-bowing mechanism
US9381695B2 (en) * 2013-05-23 2016-07-05 Entrust Datacard Corporation Card de-bowing mechanism
US9751253B2 (en) 2013-05-23 2017-09-05 Entrust Datacard Corporation Card de-bowing mechanism
US10508328B2 (en) 2016-09-27 2019-12-17 Novelis Inc. Rapid heating of sheet metal blanks for stamping
US11242586B2 (en) 2016-09-27 2022-02-08 Novelis Inc. Systems and methods for threading a hot coil on a mill
US10370749B2 (en) * 2016-09-27 2019-08-06 Novelis Inc. Systems and methods for threading a hot coil on a mill
US12376200B2 (en) 2016-09-27 2025-07-29 Novelis Inc. Rotating magnet heat induction
US10837090B2 (en) 2016-09-27 2020-11-17 Novelis Inc. Magnetic levitation heating of metal with controlled surface quality
US10844467B2 (en) 2016-09-27 2020-11-24 Novelis Inc. Compact continuous annealing solution heat treatment
US12338520B2 (en) 2016-09-27 2025-06-24 Novelis Inc. Pre-ageing systems and methods using magnetic heating
US11072843B2 (en) 2016-09-27 2021-07-27 Novelis Inc. Systems and methods for non-contact tensioning of a metal strip
US11821066B2 (en) 2016-09-27 2023-11-21 Novelis Inc. Systems and methods for non-contact tensioning of a metal strip
US11785678B2 (en) 2016-09-27 2023-10-10 Novelis Inc. Rotating magnet heat induction
US11377721B2 (en) 2016-09-27 2022-07-05 Novelis Inc. Systems and methods for threading a hot coil on a mill
US11479837B2 (en) 2016-09-27 2022-10-25 Novelis Inc. Pre-ageing systems and methods using magnetic heating
US11499213B2 (en) 2016-09-27 2022-11-15 Novelis Inc. Systems and methods for threading a hot coil on a mill
CN109290395A (zh) * 2018-09-26 2019-02-01 王敏侠 一种板材整平机
CN109290395B (zh) * 2018-09-26 2020-11-24 安徽省赛旺商贸有限公司 一种板材整平机
CN109290394A (zh) * 2018-09-26 2019-02-01 王敏侠 一种提高板材整平效果的方法
CN113561457B (zh) * 2021-08-02 2023-04-07 安徽纳赫智能科技有限公司 一种汽车内饰件的矫形设备
CN113561457A (zh) * 2021-08-02 2021-10-29 安徽纳赫智能科技有限公司 一种汽车内饰件的矫形设备

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Publication number Publication date
BE711733A (is") 1968-09-06
FR1555335A (is") 1969-01-24
GB1217013A (en) 1970-12-23

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