EP1341936B1 - Procede et dispositif de chauffage partiel de feuilles metalliques - Google Patents

Procede et dispositif de chauffage partiel de feuilles metalliques Download PDF

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Publication number
EP1341936B1
EP1341936B1 EP01271454A EP01271454A EP1341936B1 EP 1341936 B1 EP1341936 B1 EP 1341936B1 EP 01271454 A EP01271454 A EP 01271454A EP 01271454 A EP01271454 A EP 01271454A EP 1341936 B1 EP1341936 B1 EP 1341936B1
Authority
EP
European Patent Office
Prior art keywords
electrode
metal sheet
heating
metal
sheets
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.)
Expired - Lifetime
Application number
EP01271454A
Other languages
German (de)
English (en)
Other versions
EP1341936A1 (fr
Inventor
Leif Carlsson
Hans Groth
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.)
Outokumpu Stainless AB
Original Assignee
Outokumpu Stainless AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Outokumpu Stainless AB filed Critical Outokumpu Stainless AB
Publication of EP1341936A1 publication Critical patent/EP1341936A1/fr
Application granted granted Critical
Publication of EP1341936B1 publication Critical patent/EP1341936B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/40—Direct resistance heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/62—Continuous furnaces for strip or wire with direct resistance heating

Definitions

  • the present invention relates to a method and a device for partial heating of metal sheets for the purpose of establishing zones, or lines, permanently lowering the yield point of the sheets. At those zones or lines there will later on be carried out a plastic deformation subsequently to the sheets having, by hardening or cold-working, been given an increased yield point, generally causing deteriorated ductility.
  • the object of the present invention is to provide a method and a device as defined in claims 1 and 6 respectively, for partial heating in the context mentioned above, and to eliminate the disadvantages enumerated here.
  • the features characterizing the invention are set out in the subsequent claims.
  • the invention there have now become available a method and a device which in an excellent manner satisfies its purpose.
  • the method can be carried out conveniently and the device can be manufactured at low cost.
  • a resistance heating device provided with at least one electrode of carbon, graphite or a non-metallic material having similar properties and exhibiting low friction values when the electrode, or the electrodes when they are two in number, mounted one on each side of the sheet, and are displaced while pressed against it.
  • the use of this method and of this device results in a heating pattern having great advantages in comparison with the previously known methods.
  • the electrode points When, in the case where two electrodes are used, the current feed is initiated, the electrode points will get very hot, meaning that the sheet is heated from both sides, right out to the outermost portion, i.e. not mainly in the center, and simultaneously a resistance heating is generated due to the current passage. Thanks to the invention a very quick heating occurs and the friction between the metal sheets and the electrodes is very low. Moreover, the extension of the heated zone is precise because it is possible to complete the process very quickly and because it can be directed. There is also a possibility to influence the heating process by variation of the electrode pressure, the feeding speed and the current characteristic resulting in different balances in response to the resistance heating and to the heating emanating the hot electrodes.
  • the field of application of the invention is partial heating of metal sheets in order to establish zones which are to be plastically deformed subsequently to the sheets having, by hardening or cold working, been given a higher yield point, and hence generally a lower ductility.
  • Its structure could be such that it comprises two opposite electrodes, facing each other at a variable distance between them determined by the thickness of the metal sheet which is to be used.
  • the electrodes consist of carbon, graphite or of a non-metallic material with similar properties. They have a low friction value when pressed against the metal sheet from opposite sides thereof.
  • the electrodes and the sheet can be moved relatively each other during the heating process. They are mounted in electrically conductive electrode holders which enclose them so that only a very short portion of them projects.
  • the electrode diameter can vary from a few mms and upwards and the electrode pressure does not have to be higher than within the order of magnitude of 1,5 - 15 N/mm 2 . Also, the electrode diameter could be different for those above and those below the sheet, to create an unsymmetric heating.
  • the current source could be constituted by a simple welding transformer. When two electrodes are used they may be mounted one on each side of the sheet making it possible for the current through the sheet to flow from the one electrode to the other. When feed current is switched on the electrode tips turn very hot, even glowing, and they heat the sheet from both sides. The current passage yields a symmetric heating of the sheet.
  • the heating takes place from the one side of the sheet, where the current flows from that electrode to the sheet, which is connected to ground or in contact with an underlying, grounded metal plate, this results in a more unilateral heating, i.e. a non-symmetrical heating in the thickness direction, than what is the case in the embodiment utilizing two electrodes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (8)

  1. Procédé de chauffage partiel de feuillards métalliques afin d'établir des endroits sous forme de zones ou de lignes au moins sur une face du feuillard métallique dans lesquels une déformation plastique aura lieu ultérieurement, une augmentation de la limite d'élasticité, entraînant en général une moins bonne ductilité, ayant été donnée au feuillard avant cela par trempe ou par travail à froid, caractérisé en ce que l'on produit le chauffage partiel par un chauffage par résistance électrique à l'aide d'au moins une électrode consistant en carbone, en graphite ou en une matière non métallique ayant des propriétés analogues, l'électrode ayant un petit coefficient de frottement, lorsqu'elle est pressée sur le feuillard métallique pendant un déplacement relatif simultané de l'électrode et du feuillard métallique l'un par rapport à l'autre.
  2. Procédé suivant la revendication 1, caractérisé en ce que l'on fait usage de deux électrodes, chacune d'entre elles étant placée d'un côté du feuillard métallique à chauffer partiellement, le courant passant ensuite d'une électrode à l'autre par l'intermédiaire du feuillard métallique interposé.
  3. Procédé suivant la revendication 2, caractérisé en ce que, lorsque l'on alimente en courant, on chauffe le feuillard métallique par ses deux faces, et le chauffage par résistance est obtenu pendant le passage du courant.
  4. Procédé suivant la revendication 1, caractérisé en ce que l'on effectue le chauffage par une électrode d'un côté, le courant passant de cette électrode au feuillard métallique ou à une plaque métallique sous-jacente pour connexion à la terre de manière à établir un chauffage unilatéral et dissymétrique.
  5. Procédé suivant la revendication 1, caractérisé en ce que le diamètre de l'électrode varie à partir d'une valeur minimum d'environ 1 mm, et en ce que la pression de l'électrode est comprise entre environ 1,5 et 15 N/mm2, le diamètre de l'électrode du côté supérieur et du côté inférieur du feuillard métallique étant le même ou différent.
  6. Dispositif de chauffage partiel de feuillards métalliques, afin d'établir des endroits sous forme de zones ou de lignes sur au moins une face du feuillard métallique dans lesquelles a lieu ensuite une déformation plastique, une augmentation de la limite d'élasticité, entraînant en général une moins bonne ductilité, ayant été donnée au feuillard avant cela par trempe ou par travail à froid, caractérisé en ce qu'il comprend au moins une électrode qui est mise en contact avec le feuillard métallique à chauffer par chauffage par résistance électrique et l'électrode consiste en carbone, en graphite ou en une matière non métallique ayant des propriétés analogues, l'électrode ayant un petit coefficient de frottement et des moyens pour venir en contact à une pression déterminée à l'avance avec le feuillard métallique, l'électrode et le feuillard métallique étant déplacés en même temps l'un par rapport à l'autre.
  7. Dispositif suivant la revendication 6, caractérisé en ce qu'il comprend deux électrodes opposées qui sont mises en position à une distance l'une de l'autre qui peut être modifiée pour s'adapter à l'épaisseur du feuillard métallique à chauffer et qui ont un petit coefficient de frottement lorsque sur des faces opposées du feuillard métallique elles viennent en contact avec ce dernier, les électrodes et le feuillard métallique étant déplacés simultanément les uns par rapport aux autres.
  8. dispositif suivant la revendication 6, caractérisé en ce qu'il comprend une électrode disposée unilatéralement et dissymétriquement pour chauffer le feuillard métallique qui lui-même est mis au potentiel de terre ou est relié à une plaque métallique sous-jacente.
EP01271454A 2000-12-15 2001-11-29 Procede et dispositif de chauffage partiel de feuilles metalliques Expired - Lifetime EP1341936B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0004665 2000-12-15
SE0004665A SE520369C2 (sv) 2000-12-15 2000-12-15 Förfarande och anordning vid partiell uppvärmning av metallplåtar
PCT/SE2001/002649 WO2002050316A1 (fr) 2000-12-15 2001-11-29 Procede et dispositif de chauffage partiel de feuilles metalliques

Publications (2)

Publication Number Publication Date
EP1341936A1 EP1341936A1 (fr) 2003-09-10
EP1341936B1 true EP1341936B1 (fr) 2006-08-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01271454A Expired - Lifetime EP1341936B1 (fr) 2000-12-15 2001-11-29 Procede et dispositif de chauffage partiel de feuilles metalliques

Country Status (6)

Country Link
EP (1) EP1341936B1 (fr)
AT (1) ATE335858T1 (fr)
AU (1) AU2002218615A1 (fr)
DE (1) DE60122206D1 (fr)
SE (1) SE520369C2 (fr)
WO (1) WO2002050316A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005018974B4 (de) * 2004-04-29 2015-04-09 Kuka Systems Gmbh Verfahren und Vorrichtung zum Erwärmen von elektrisch leitfähigen unbeschichteten oder beschichteten Platinen
AT500682B1 (de) * 2004-04-29 2007-05-15 Kuka Werkzeugbau Schwarzenberg Verfahren und vorrichtung zum erwärmen von elektrisch leitfähigen unbeschichteten oder beschichteten platinen
JP6142409B2 (ja) 2012-08-06 2017-06-07 高周波熱錬株式会社 通電加熱方法
IT202000011635A1 (it) * 2020-05-19 2021-11-19 Metallurgica Luigi Pessina Acciai S P A Dispositivo per la trasmissione di corrente in un processo di riscaldo

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1866538A (en) * 1928-07-13 1932-07-12 Smith Corp A O Method of structurally modifying the surfaces of metal bodies
JPS59105285A (ja) * 1982-12-07 1984-06-18 三菱電機株式会社 通電加熱方法
JPH06172846A (ja) * 1992-12-08 1994-06-21 Nippon Steel Corp 通電用カーボンロール
JPH10317065A (ja) * 1997-05-20 1998-12-02 Nippon Steel Corp 板状金属材料の通電加熱装置および通電加熱方法
JP3921839B2 (ja) * 1998-01-12 2007-05-30 マツダ株式会社 通電加熱処理方法及びその装置並びに通電加熱処理用電極
IT1311691B1 (it) * 1999-11-12 2002-03-19 Petrelli Francesco Mancini Procedimento di riscaldo continuo dei semilavorati metallici tramitepassaggio diretto di corrente elettrica entro il semilavorato da

Also Published As

Publication number Publication date
ATE335858T1 (de) 2006-09-15
WO2002050316A1 (fr) 2002-06-27
EP1341936A1 (fr) 2003-09-10
AU2002218615A1 (en) 2002-07-01
DE60122206D1 (de) 2006-09-21
SE0004665D0 (sv) 2000-12-15
SE0004665L (sv) 2002-06-16
SE520369C2 (sv) 2003-07-01

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