EP0730918A1 - Verfahren und Vorrichtung zum Richten von flachen metallischen Produkten sowie Blechen, Metallbanden - Google Patents

Verfahren und Vorrichtung zum Richten von flachen metallischen Produkten sowie Blechen, Metallbanden Download PDF

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Publication number
EP0730918A1
EP0730918A1 EP96400488A EP96400488A EP0730918A1 EP 0730918 A1 EP0730918 A1 EP 0730918A1 EP 96400488 A EP96400488 A EP 96400488A EP 96400488 A EP96400488 A EP 96400488A EP 0730918 A1 EP0730918 A1 EP 0730918A1
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EP
European Patent Office
Prior art keywords
rollers
product
roller
yielding
leveling
Prior art date
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.)
Granted
Application number
EP96400488A
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English (en)
French (fr)
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EP0730918B1 (de
Inventor
Jacques-Yves Bourgon
Olivier Guillard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Publication date
Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0730918A1 publication Critical patent/EP0730918A1/de
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Publication of EP0730918B1 publication Critical patent/EP0730918B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 a device for leveling flat products such as strips, sheets or metal sheets, in particular of steel, which will hereinafter be generally designated as sheet metal.
  • Leveling devices are used for the purpose of eliminating the flatness defects of the sheets after hot or cold rolling. Indeed, for example after the hot rolling phases (in a reversible quarto cage for the sheets or in the finishing train for the strips), cooling and packaging, the rolled products may have non-developable flatness defects, such as defects called long edges or long center, or developable flatness defects, such as arch or tile defects. These geometrical defects visibly affect the rolled products.
  • the aim of the planing operation is to eliminate these defects, developable and non-developable, and to ensure stability of the sheet after cutting, by eliminating or at least minimizing the internal stresses.
  • the principle of leveling by a leveler of the type concerned by the invention is to subject the sheet metal while scrolling to a succession of alternating bends, including the amplitude gradually decreases at the end of the operation.
  • this succession of flexions is ensured during the passage of the sheet between gliding rollers positioned in staggered rows and being nested one inside the other so as to cause said alternating flexions, this overlapping being reduced in the direction sheet movement, to produce said progressive decrease in the amplitude of the flexions.
  • the strong flexions to which the sheet is subjected to the entry of the leveler are required to allow sufficient plasticization of the material in order to essentially eliminate the initial non-developable geometry defects.
  • the alternating bending deformations combined with the tensile effect caused by the entrainment of the sheet, are sufficiently large, there is plasticization of all the fibers of the material over the entire width of the sheet.
  • these strong deformations generally create a non-homogeneous distribution of longitudinal internal stresses (leading to the defect called arch) and transverse (defect called tile) in the thickness of the sheet. Indeed, although there is plasticization of all the material, this plasticization is more or less important depending on the initial geometry defects. To ensure correct leveling, this heterogeneous distribution of stresses must be eliminated, and the intensity of the stresses must be reduced, in a following phase, which is practically achieved by the succession of bends of decreasing amplitude towards the exit of the straightener. .
  • Leveling is really effective when the sheet obtained is perfectly flat before cutting, and the rest after any cutting, which can only result from a gradient of residual internal stresses after leveling as low as possible. Only a deformation homogeneous sheet over its width allows to obtain the lowest possible residual stress gradients.
  • Levelers currently known generally comprise, in addition to conventional means for adjusting the position of the leveling rollers located on either side of the trajectory of the sheet, cedage compensation systems, or counter-bending systems, adjustable, intended for avoid bending of the leveling rollers under the effect of the forces to which they are subjected during leveling.
  • cedage compensation systems or counter-bending systems, adjustable, intended for avoid bending of the leveling rollers under the effect of the forces to which they are subjected during leveling.
  • FIG. 1 which schematically represents a leveler for thin sheets
  • support rollers 9 are placed on a support frame 7 and kept in contact with the leveling rollers 5. The latter are thus supported by the so-called support rollers, which limit the flexural deformations of the rollers.
  • the leveling rollers are mounted journalling in bearings (not shown in FIG.
  • each bed base of the leveler (upper bed base 1, bottom bed base 2).
  • At least one of these bed bases being adjustable in position, makes it possible to adjust the spacing of the two series of leveling rollers 5, while, in each bed base, the support rollers 9 are linked to the support frame 7, which is itself part of the bed base, and can only be more or less pressed against the leveling rollers to avoid deformations of the latter.
  • a typical system for adjusting the counter-bending consists of a set of biased shims 11 placed between the base and the chassis of the support rollers; the relative horizontal displacement of said bias wedges, controlled by a motor 13, leads to more or less strongly pressing all of the support rollers 9 against the leveling rollers 5 and thus to limit the deformation of the latter under the bending force sheet metal.
  • Other means of adjusting the against bending such as jacks, are also known and used to act on the support rollers to ensure compensation of the yielding on all the leveling rollers of a bed base, upper or lower, or of the two bed bases.
  • the sheets leaving the leveler still have either flatness defects visible at the exit of the leveler, such as long edges or long center, or defects which are revealed only during cutting, such as defect in the hanger or saber, the latter being a defect causing a deformation of curvature of the sheet in its own plane.
  • the present invention aims to solve the problems mentioned above and aims in particular to allow the manufacture and supply of sheets having the smallest possible flatness defects, in particular less than 3 mm / m, and having no risk of occurrence of such defects after delivery to the user, when the latter proceeds to cut them.
  • the subject of the invention is a method of leveling flat metal products such as sheets, sheets or strips, according to which said product is made to pass between two sets of leveling rollers, the leveling rollers of one set being offset, in the direction of travel, relative to those of the other set, and the two sets being spaced from each other and positioned so as to subject the product to a succession of alternating bending of decreasing amplitude, and we compensate the yielding of the planer rollers caused by the forces exerted by the product on the said rollers, characterized in that we compensate the said yielding independently for each roller, so as to subject all the longitudinal fibers of the product in successions of bending deformations whose amplitudes, and amplitude variations in the direction of travel, are substantially identical over the entire width of said product, at least on the rollers located on the output side of the leveler.
  • the method according to the invention it is possible to ensure an efficient and effective leveling, which ensures the production of sheets not only devoid of geometric flatness defects at the exit from the leveler, but also having a very low internal stress gradient practically eliminating the risks. appearance of flatness defects later, during the implementation of the sheet by cutting.
  • the inventors have discovered, following in-depth studies of the leveling process carried out in levelers according to the prior art, that the flatness defects which may remain after the leveling operation result in particular from different deformation rates between the different longitudinal fibers of the product during the successive alternating flexions to which it is subjected by the leveling rollers.
  • These differences in treatment of the material constituting the sheet in its width cause, even when the product appears flat at the exit from the leveler, large transverse gradients of internal stresses, which are manifested subsequently, for example after cutting the sheet, by deformations of the blanks from the planed sheet, strip or sheet.
  • the inventors have sought the possible causes of these heterogeneities in the treatment of sheet metal during leveling carried out according to prior techniques.
  • a first cause appeared in the existence, in the rolled sheet before planing, of fiber defects, of the "long edges" or "long center” type.
  • These non-developable faults are in principle corrected during first alternate bending performed by the first rollers of the leveler, which must lead to plastic deformations of the material. Due to the aforementioned fiber defects, these deformations do not, however, have the same effect on all fibers, the longest fibers being less plasticized than the shorter fibers, and this results in the appearance of the internal stress gradients already mentioned. .
  • the alternating flexions of progressively decreasing amplitude then applied to the product by the leveling rollers located downstream are in principle intended to homogenize the state of internal stresses and to reduce their intensity.
  • the curves J1, J5 and J2, J6 correspond to the deformations measured in ⁇ m / m by the gauges placed towards the banks
  • the curves J3, J4 correspond to the deformations measured by the gauges located in the center of the sheet.
  • Each peak 21, 23 of the different curves corresponds to the passage of the sheet metal zone provided with the gauges on a leveling roller (respectively 51, 53), as shown diagrammatically in FIG. 2, the difference in abscissa between successive peaks corresponding to the distance between the vertical planes of the axes of two successive rollers.
  • the peaks directed downward correspond to the gauges located on the face of the sheet in contact with the planing roller concerned, subjected to a compression deformation
  • the peaks directed upward correspond to the gauges located on the other face, subjected to an elongation.
  • the known leveling methods implied an identical yielding compensation adjustment for all the rollers;
  • the forces undergone by the rollers located downstream are less than those undergone by the input rollers due to the lesser deformations imposed on the product, their own yielding is also less.
  • the yielding compensation is identical, in terms of displacement of the support rollers, for all the rollers, this results in either substantial yielding, and therefore excessive deflection, of the input rollers, in the case of '' optimal compensation on the output rollers, i.e. excessive counter-bending of the output rollers, in the case of optimal compensation on the input rollers.
  • the air gap between two successive rollers (a lower roller and an upper roller) cannot be kept constant over their length for all the rollers, which necessarily leads to different deformations of the product in its different longitudinal zones, and therefore the existence of a transverse gradient of constraints unacceptable to the required flatness.
  • the method according to the invention makes it possible to adjust the yield compensation for each roller, and therefore makes it possible to ensure the optimum air gap for each pair of rollers, whatever its position in the leveler, and therefore to subject the product has substantially identical deformations over its entire width.
  • these identical bending deformations over the width of the product are not necessarily over the entire length of the leveler.
  • the invention also relates to a device for leveling flat metal products, allowing the implementation of the method described above, this device comprising at least one set of two bed bases each provided with a set of leveling rollers, and means for compensation for the yielding of said rollers, and being characterized in that each roller is provided with its own means for compensation for yielding, adjustable independently from one roller to another.
  • the means of compensating for the yielding comprise rollers for supporting the said gliding rollers, pressure means for applying the said rollers to the said rollers, and pressure means, independent for each roller, of the pressure exerted by said rollers on the rollers.
  • each roller Preferably, several sets of rollers are distributed over the length of each roller, each of these sets having independent pressure adjustment means.
  • the device can also include means for measuring the forces exerted by the product on the rollers, and means for controlling said yielding compensation means as a function of the forces measured, thus making it possible to permanently adjust, or on command, the offset compensation according to the characteristics of the planed product.
  • FIGS 5 and 6 illustrate an embodiment of the leveler according to the invention. Only the upper base 1 has been shown, the lower base being produced in a similar manner.
  • the planer rollers 51 are rotatably mounted in bearings 61 linked to the frame 63 of the bed base.
  • Each roller is provided with yielding compensation means, consisting of several sets 65 of support rollers, distributed over the length of the roller. The number of these sets depends on the length of the rollers. Preferably, a set of support rollers is located towards the middle of the roller, and another set towards each of its ends. Other sets of rollers can be placed in intermediate positions when the rollers are long, for leveling large sheets or sheets.
  • Each assembly comprises two support rollers 67 whose axes are offset on either side of the vertical plane passing through the axis of the roller 51, so as to support the latter in the vertical direction, and also to prevent displacement or bending in a horizontal plane.
  • Each pair of rollers 67 is mounted on a support 69, guided vertically in translation on the bed base 1.
  • a jack 71 is placed between the bed base and each support 69 of rollers, in order to press said rollers 67 against the roller 51.
  • all the rollers are mounted on the same bed base, and the spacing between the upper rollers and the lower rollers is adjusted simultaneously for all the rollers by adjusting the relative position of the lower and upper bed bases, in spacing and tilting. , that is to say in relative inclination so that the air gap between the lower and upper rollers is greater towards the exit from the leveler than towards the entry.
  • the first roller or rollers entering the leveler may however be adjusted in position independently of the rollers located downstream, so as to allow adjustment of the amplitude of the first bending deformations, without influencing that of the following rollers.
  • the upper input roller 52 can be mounted on a base 1 ', independent of the base 1 supporting the output leveling rollers, and having its own means for adjusting the distance between the roller 52 relative to to the corresponding rollers of the lower base.
  • this first roller 52 is provided with very powerful yield compensation means, in order to correct the flatness defects by selective stretching of the fibers (in the center or on the edges), the following rollers ensuring a progressive and homogeneous expansion in the width sheet metal, made possible by the individually adjustable yield compensation on each roll.
  • This setting is normally not changed during the leveling operation, although it is possible to act at any time on any of the cylinders.
  • the leveler with means for continuously measuring the forces exerted by the product on the rollers or the position of said rollers or support rollers, and means for controlling the cylinders as a function of the measured forces or of said measured positions, in order to adjust the counter-bending on each roller during planing.
  • the invention is not limited to the leveling device which has just been described only by way of example.
  • the number of rollers, the number of rollers per roller and the relative arrangement of the rollers relative to the rollers may be modified without departing from the scope of the invention.
  • the means for adjusting the counter-bending described above may be replaced by other equivalent means known to those skilled in the art.
  • these pressure adjustment means can be common to several sets of support rollers if it is desired to reduce the cost price of the machine.
  • a single cylinder in the middle position along the generator of a roller and associated with a metal support plate interposed between the cylinder and the supports 69 may be suitable for this purpose.
  • the possibilities for fine adjustment of the counter-flexions are correspondingly more reduced, but may be sufficient for certain installations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Coating With Molten Metal (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Laminated Bodies (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP96400488A 1995-03-08 1996-03-08 Verfahren und Vorrichtung zum Richten von flachen metallischen Produkten sowie Blechen, Metallbanden Expired - Lifetime EP0730918B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9502852 1995-03-08
FR9502852A FR2731372B1 (fr) 1995-03-08 1995-03-08 Procede et dispositif de planage de produits plats metalliques, tels que bandes, toles ou feuilles

Publications (2)

Publication Number Publication Date
EP0730918A1 true EP0730918A1 (de) 1996-09-11
EP0730918B1 EP0730918B1 (de) 2001-03-28

Family

ID=9476952

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400488A Expired - Lifetime EP0730918B1 (de) 1995-03-08 1996-03-08 Verfahren und Vorrichtung zum Richten von flachen metallischen Produkten sowie Blechen, Metallbanden

Country Status (6)

Country Link
EP (1) EP0730918B1 (de)
AT (1) ATE200043T1 (de)
DE (1) DE69612225T2 (de)
ES (1) ES2155174T3 (de)
FR (1) FR2731372B1 (de)
PT (1) PT730918E (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100344390C (zh) * 2004-02-26 2007-10-24 博格德+舒密特有限责任公司 用于矫平的装置
CN101683664B (zh) * 2008-09-28 2011-07-27 鞍钢股份有限公司 一种含有镍钒成分容器钢板的矫直方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009029817A1 (de) 2009-06-18 2010-12-23 Institut für innovative Technologien, Technologietransfer, Ausbildung und berufsbegleitende Weiterbildung (ITW) e.V. Vorrichtung und Verfahren zur Erwärmung von Bauteilen aus Metall
DE102012204074A1 (de) 2012-03-15 2013-09-19 Sms Siemag Ag Vorrichtung zum Richten von Metallband
DE102017124027B4 (de) * 2017-10-16 2021-06-10 Schuler Pressen Gmbh Verfahren, Vorrichtung und Computerprogrammprodukt zum Einstellen der Biegung zumindest einer Richtwalze einer Walzenrichtmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2006609A1 (de) * 1968-04-20 1969-12-26 Wilhelmsburger Maschf
FR2334440A1 (fr) * 1975-12-09 1977-07-08 Mesta Machine Co Machine et procede pour dresser des toles
DE2747331A1 (de) * 1977-10-21 1979-04-26 Schloemann Siemag Ag Vorrichtung zum verstellen von stuetzrollen
DE3308616A1 (de) * 1983-03-11 1984-09-13 SMS Schloemann-Siemag AG, 4000 Düsseldorf Verfahren und vorrichtung zum richten von blech
JPS6137322A (ja) * 1984-07-30 1986-02-22 Ishikawajima Harima Heavy Ind Co Ltd ロ−ラ−レベラ−
EP0182062A2 (de) * 1984-10-16 1986-05-28 Fr.W. SCHNUTZ GMBH & CO. Stützwalzenverstellung für Richtmaschinen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2006609A1 (de) * 1968-04-20 1969-12-26 Wilhelmsburger Maschf
FR2334440A1 (fr) * 1975-12-09 1977-07-08 Mesta Machine Co Machine et procede pour dresser des toles
DE2747331A1 (de) * 1977-10-21 1979-04-26 Schloemann Siemag Ag Vorrichtung zum verstellen von stuetzrollen
DE3308616A1 (de) * 1983-03-11 1984-09-13 SMS Schloemann-Siemag AG, 4000 Düsseldorf Verfahren und vorrichtung zum richten von blech
JPS6137322A (ja) * 1984-07-30 1986-02-22 Ishikawajima Harima Heavy Ind Co Ltd ロ−ラ−レベラ−
EP0182062A2 (de) * 1984-10-16 1986-05-28 Fr.W. SCHNUTZ GMBH & CO. Stützwalzenverstellung für Richtmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 191 (M - 495) 4 July 1986 (1986-07-04) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100344390C (zh) * 2004-02-26 2007-10-24 博格德+舒密特有限责任公司 用于矫平的装置
CN101683664B (zh) * 2008-09-28 2011-07-27 鞍钢股份有限公司 一种含有镍钒成分容器钢板的矫直方法

Also Published As

Publication number Publication date
ES2155174T3 (es) 2001-05-01
FR2731372A1 (fr) 1996-09-13
EP0730918B1 (de) 2001-03-28
DE69612225T2 (de) 2001-10-11
ATE200043T1 (de) 2001-04-15
DE69612225D1 (de) 2001-05-03
FR2731372B1 (fr) 1997-05-16
PT730918E (pt) 2001-09-28

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