EP3848131A1 - Procédé de redressage de plaques métalliques et appareil pour la mise en oeuvre de ce procédé de redressage - Google Patents

Procédé de redressage de plaques métalliques et appareil pour la mise en oeuvre de ce procédé de redressage Download PDF

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Publication number
EP3848131A1
EP3848131A1 EP21150266.1A EP21150266A EP3848131A1 EP 3848131 A1 EP3848131 A1 EP 3848131A1 EP 21150266 A EP21150266 A EP 21150266A EP 3848131 A1 EP3848131 A1 EP 3848131A1
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EP
European Patent Office
Prior art keywords
plate
heating
bench
cooling
flat
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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.)
Granted
Application number
EP21150266.1A
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German (de)
English (en)
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EP3848131C0 (fr
EP3848131B1 (fr
Inventor
Fabio BADIN
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.)
Badin Block Srl
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Badin Block Srl
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Publication of EP3848131C0 publication Critical patent/EP3848131C0/fr
Publication of EP3848131B1 publication Critical patent/EP3848131B1/fr
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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
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling

Definitions

  • This invention relates to a process and related apparatus for straightening metal elements, such as metal plates or sheets of varying thickness by means of localised heating and cooling of the sheet itself.
  • the sheets obtained from the cutting of a metal strip maintain the curvature that they assume following the rolling up of the strip on the corresponding coil.
  • the curvature of metal sheets causes significant problems in the processing and assembly operations thereof. In fact, a sheet that has not been straightened can cause a malfunction in the moulding operations due to incorrect insertion of the sheet inside the mould or difficulty in ejecting the piece and scraps. In extreme cases, the curvature of the sheet can even entail loss of the final piece.
  • curvature or non-flatness of the metal sheets can also derive from the original state of the raw material, or from deformations and stresses induced by thermal cutting and metal processing to which the sheets are usually subjected.
  • the flatness of the material becomes particularly important in order to obtain a high-quality final product that does not require subsequent processing and a consequent increase in production costs.
  • a first straightening process mainly used for thin sheets, involves the use of manually controlled presses that exert pressure on the convexity of the sheet and cause it to yield in the opposite direction until a basically flat sheet is obtained.
  • Presses that combine mechanical action and heating of the sheet are also known in order to decrease the yield stress of the material and save on the energy to be exerted by the press, as described in the European patent application EP 3 566 807 A1 , for example.
  • a second process involves the use of machines equipped with several straightening rollers or cylinders that act on the upper and lower sides of the metal sheet.
  • the action of the cylinders subjects the sheet to alternating plastic deformation until it becomes flat.
  • the quantity of cylinders and the relative diameters are chosen according to the thickness of the metal sheet and the degree of straightening that needs to be obtained.
  • multi-cylinder machines require a significant outlay and frequent adjustment, replacement, and maintenance operations for the cylinders.
  • Italian patent N. 1082823 describes a cylinder machine for straightening metal laminates.
  • Flame straightening benches are also known. These are mainly used for straightening thin plates intended for the mass production of railway cars.
  • the sheet is placed on a resting surface and clamped by means of clamping tools that prevent the expansion thereof.
  • a drilled metal template is placed over the sheet to be straightened and clamps it in place during the heating process, which is carried out at the template holes.
  • the size of the drilled template, its thickness, and the distances between the holes depend on the component material and the thickness of the piece to be straightened. It is essential, therefore, that these operations are carried out by specialised and very experienced operators.
  • the main purposes of the process and apparatus according to the invention are to overcome these limitations and to make the straightening process faster and more functional.
  • the process comprises, for example, the following steps:
  • the scanning means 45 may be moved over the entire surface of the support bench 40 in order to analyse all the defects in the plate 30.
  • the scanning means 45 may consist of, for example, two or more 3D cameras attached to a structure of the apparatus that reproduce a topography of the plate 30 by working in triangulation.
  • the clamping means may consist of any means capable of maintaining the plate or sheet 30 in close contact with the flat support bench 40 during the step for heating and/or cooling the sheet 30 irregularities.
  • the clamping means configured to hold sheet 30 in close contact with the bench 40 are mechanical, and the upper surface of the support bench 40 is coated with a layer 42 of sliding material that is configured to resist high temperatures.
  • the clamping means configured to hold the sheet 30 in close contact with the bench 40 are electromagnetic and the upper surface of the support bench 40 is coated with a layer 42 of sliding and anti-friction material that, in addition to being configured to resist high temperatures, does not hinder the attraction force exerted by said electromagnetic clamping means.
  • the clamping means may comprise both mechanical and electromagnetic means.
  • the presence of the layer 42 of sliding and anti-friction material capable of resisting high temperatures serves to ensure greater freedom for the plate 30 to expand, upon heating, and to contract, upon cooling, while still remaining in close contact with the flat bench 40.
  • the apparatus 50 comprises an external frame 44, with a parallelepiped shape, that houses a flat bench 40 for supporting the sheet 30 to be straightened.
  • the support bench 40 may be connected to mechanical clamping means configured to hold the sheet 30 in close contact with the flat bench 40 but free to expand, upon heating, and to contract, upon cooling.
  • the mechanical clamping means may be compression rollers.
  • electromagnetic means may be connected to the support bench 40.
  • a single electromagnet 41 or multiple individual electromagnets 41, which exert their attraction force on the sheet 30, may be connected.
  • the electromagnet force may be homogenously exerted, from a single electromagnet 41 that extends across the whole surface of the support bench 40.
  • several electromagnets 41 may be connected to the support bench 40 and the electromagnetic attraction force developed by each single electromagnet 41 may be adjusted so as to perform a differentiated action on the surface portion of the sheet 30 placed near the individual electromagnet 41.
  • the upper surface of the support bench 40 is covered with a layer 42 of sliding and anti-friction material configured to resist high temperatures and permeable to the attraction force exerted by the electromagnets 41 (such as, for example: bronze, graphite, lubricated steel).
  • a layer 42 of sliding and anti-friction material configured to resist high temperatures and permeable to the attraction force exerted by the electromagnets 41 (such as, for example: bronze, graphite, lubricated steel).
  • the layer 42 may nevertheless partially reduce the original maximum force generated by the electromagnet 41.
  • a scanning device 45 ( Figures 5 and 6 ) may be slidably moved above the entire surface of the support bench 40 to enable the identification and location of sheet 30 irregularities.
  • the scanning device 45 is fixed to the apparatus and may consist of a pair of 3D video cameras (not shown in the figure).
  • the scanning device 45 transmits the coordinates of the irregularities detected on the sheet 30 to an electronic control and command device, of a known type that is not shown.
  • One or more heating torches, or one or more electric heating devices, of a known type are slidably connected both horizontally and vertically to a crossbar 48 that can also be moved above the entire surface of the support bench 40 to heat the sheet 30 irregularities.
  • a cooling device 49 may be connected to each torch or electrical heating device ( Fig. 3 ) configured to emit a cooling fluid over the surface of the sheet 30.
  • the electronic control and command device makes the heating means 47 perform the most suitable movements and heating/cooling cycles for straightening the sheet 30.
  • the metal sheet 30 to be straightened is placed on the support bench 40 ( Fig. 2A ) and activation of the mechanical clamping means, according to one embodiment, or of the electromagnets 41, according to another embodiment, brings the lower surface of the sheet 30 into close contact with the layer of anti-friction material 42 of the support bench 40 and into a basically horizontal position ( Fig. 2B ). It is clear that the dimensions of the support bench may be such as to enable the simultaneous straightening of several sheets 30.
  • the sheet 30 is subjected to a heating step of a known type, for example by flame or electrically ( Fig. 2B ), carried out using appropriate heating means 47, for example flame heating torches or electric heating devices, and to a subsequent cooling step ( Fig. 3 ) that may occur, also in a known manner, either in free air or by supplying fluids (air, gas, or liquid) via nozzles 49 that accelerate the cooling process.
  • a heating step of a known type for example by flame or electrically ( Fig. 2B )
  • appropriate heating means 47 for example flame heating torches or electric heating devices
  • a subsequent cooling step Fig. 3
  • the sheet 30 is always kept in a horizontal position and in close contact with the support bench 40 but can expand and contract freely thanks to the layer of anti-friction material 42.
  • the clamping means for example, the mechanical means or the electromagnets 41
  • the straightened sheet 30 can be separated from the support bench 40 and conducted for subsequent processing.
  • the process and related apparatus described herein significantly improve the degree of straightening of the sheet 30 since they avoid the induced stresses that occur in sheets straightened using known straightening processes and equipment.
  • the sheet 30 is a single sheet and has a rectangular shape.
  • the process and apparatus 50 would be equally advantageous if there were more than one sheet 30 and they had shapes other than rectangular ones.
  • the invention achieves the main purpose of providing a manufacturing process and a related apparatus 40 which make it possible to straighten the sheet 30 in a simple and practical way and without requiring the employment of highly specialised personnel and avoiding the arrangement of an impractical and expensive assortment of drilling templates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
EP21150266.1A 2020-01-10 2021-01-05 Procédé de redressage de plaques métalliques et appareil pour la mise en oeuvre de ce procédé de redressage Active EP3848131B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102020000000307A IT202000000307A1 (it) 2020-01-10 2020-01-10 Procedimento per la raddrizzatura alla fiamma di lastre metalliche e apparecchiatura per realizzare tale procedimento di raddrizzatura

Publications (3)

Publication Number Publication Date
EP3848131A1 true EP3848131A1 (fr) 2021-07-14
EP3848131C0 EP3848131C0 (fr) 2026-02-25
EP3848131B1 EP3848131B1 (fr) 2026-02-25

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Family Applications (1)

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EP21150266.1A Active EP3848131B1 (fr) 2020-01-10 2021-01-05 Procédé de redressage de plaques métalliques et appareil pour la mise en oeuvre de ce procédé de redressage

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EP (1) EP3848131B1 (fr)
IT (1) IT202000000307A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023118218A1 (fr) * 2021-12-21 2023-06-29 Theodor Gräbener GmbH & Co. KG Procédé et dispositif de lissage de composants de type plaque, en particulier pour la production de plaques bipolaires pour un système électrochimique, tel que, par exemple, des piles à combustible
CN119346660A (zh) * 2024-12-20 2025-01-24 四川筑盾人防工程设备有限公司 一种金属板校型工具及校型方法
WO2026017364A1 (fr) * 2024-07-17 2026-01-22 Robert Bosch Gmbh Procédé pour usiner et aplanir des plaques bipolaires

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117753822B (zh) * 2024-02-19 2024-04-30 青州珺凯铸钢科技有限公司 一种铸钢件矫形方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5415462A (en) * 1978-06-23 1979-02-05 Hitachi Ltd Method of removing heat distortion
JPS58187213A (ja) * 1982-04-28 1983-11-01 Hitachi Ltd 薄板の歪取り方法及び治具
IT1082823B (it) 1976-10-13 1985-05-21 Ungerer Irma Macchina raddrizzatrice per lamiere
US20160016255A1 (en) * 2014-07-17 2016-01-21 Siemens Energy, Inc. Laser correction of metal deformation
EP3566807A1 (fr) 2018-05-08 2019-11-13 General Electric Company Ensemble de presse de reprise pour systèmes de reprise de composants et procédés d'utilisation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1082823B (it) 1976-10-13 1985-05-21 Ungerer Irma Macchina raddrizzatrice per lamiere
JPS5415462A (en) * 1978-06-23 1979-02-05 Hitachi Ltd Method of removing heat distortion
JPS58187213A (ja) * 1982-04-28 1983-11-01 Hitachi Ltd 薄板の歪取り方法及び治具
US20160016255A1 (en) * 2014-07-17 2016-01-21 Siemens Energy, Inc. Laser correction of metal deformation
EP3566807A1 (fr) 2018-05-08 2019-11-13 General Electric Company Ensemble de presse de reprise pour systèmes de reprise de composants et procédés d'utilisation

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
BOC: "Fundamentals of flame straightening", 3 January 2014 (2014-01-03), https://www.boconline.co.uk/en/processes/manufacturing-processes/heating-process/flame-straightening/flame-straightening.html, pages 1 - 32, XP055700958, Retrieved from the Internet <URL:https://www.boconline.co.uk/en/images/Fundamentals-of-Flame-Straightening_tcm410-113398.pdf> [retrieved on 20200604] *
VOLKMAR SCHULER: "The Golden Rules of Flame Straightening", 1 October 2015, AUSTRALIAN WELDING, pages: 26 - 27
VOLKMAR SCHULER: "The Golden Rules of Flame Straightening", AUSTRALIAN WELDING, 1 October 2015 (2015-10-01), pages 26 - 27, XP055700967, Retrieved from the Internet <URL:https://weldaustralia.com.au/wp-content/uploads/2016/12/The-Golden-Rules-of-Flame-Straightening.pdf> [retrieved on 20200604] *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023118218A1 (fr) * 2021-12-21 2023-06-29 Theodor Gräbener GmbH & Co. KG Procédé et dispositif de lissage de composants de type plaque, en particulier pour la production de plaques bipolaires pour un système électrochimique, tel que, par exemple, des piles à combustible
WO2026017364A1 (fr) * 2024-07-17 2026-01-22 Robert Bosch Gmbh Procédé pour usiner et aplanir des plaques bipolaires
CN119346660A (zh) * 2024-12-20 2025-01-24 四川筑盾人防工程设备有限公司 一种金属板校型工具及校型方法

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Publication number Publication date
EP3848131C0 (fr) 2026-02-25
EP3848131B1 (fr) 2026-02-25
IT202000000307A1 (it) 2021-07-10

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