EP0057385B1 - Procédé de chauffage électrique résistant direct de pièces métalliques - Google Patents

Procédé de chauffage électrique résistant direct de pièces métalliques Download PDF

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Publication number
EP0057385B1
EP0057385B1 EP82100407A EP82100407A EP0057385B1 EP 0057385 B1 EP0057385 B1 EP 0057385B1 EP 82100407 A EP82100407 A EP 82100407A EP 82100407 A EP82100407 A EP 82100407A EP 0057385 B1 EP0057385 B1 EP 0057385B1
Authority
EP
European Patent Office
Prior art keywords
periods
resistance heating
temperature
workpiece
current flow
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
Application number
EP82100407A
Other languages
German (de)
English (en)
Other versions
EP0057385A2 (fr
EP0057385A3 (en
Inventor
Klaus-Michael Dr. Ing. Petzold
Gerald Dipl.-Ing. Werthmann
Herbert Dr. Mühe
Gregor Dipl.-Phys. Müller
Werner Prof.Dr.Ing. Schirmer
Roland Dipl.-Ing. Lippmann
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.)
VEB Draht- und Seilwerk Rothenburg
Original Assignee
VEB Draht- und Seilwerk Rothenburg
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 VEB Draht- und Seilwerk Rothenburg filed Critical VEB Draht- und Seilwerk Rothenburg
Publication of EP0057385A2 publication Critical patent/EP0057385A2/fr
Publication of EP0057385A3 publication Critical patent/EP0057385A3/de
Application granted granted Critical
Publication of EP0057385B1 publication Critical patent/EP0057385B1/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0004—Devices wherein the heating current flows through the material to be heated
    • H05B3/0009—Devices wherein the heating current flows through the material to be heated the material to be heated being in motion
    • 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

Definitions

  • the invention relates to a method for the direct electrical resistance heating of metallic workpieces, in which, in addition, the temperature is influenced in certain time segments perpendicular to the direction of current flow by means of energy from the outside.
  • the surface temperature of the workpiece that has been established has basically been used to determine the electrical parameters (current, voltage) without taking into account the temperature distribution perpendicular to the direction of current flow, which is the result of heating and radiation conditions. This applies to all known methods for the direct electrical resistance heating of metallic workpieces (US Pat. No. 1,704,036).
  • the aim of the invention is to avoid the deficiencies of the prior art by using a method which enables the setting of targeted temperature distributions in a metallic workpiece perpendicular to the direction of current flow.
  • the invention has for its object to produce a temperature distribution optimally adapted to the end purpose perpendicular to the direction of current flow with direct electrical resistance heating of metallic workpieces, the dependence of the specific electrical resistance on the temperature being used to influence the temperature distribution.
  • the object is achieved in that defined energy offers act on the metallic workpiece so briefly that there is no temperature compensation over the cross-section of the workpiece within these time periods of the additional energy offers, as a result of which the temperature distribution in the workpiece arises unevenly perpendicular to the direction of current flow.
  • the time periods of the additional energy offers from the outside are before the resistance heating of the workpiece is initiated.
  • these periods of additional temperature influence can also lie within the periods of direct electrical resistance heating of the workpiece or before and within the periods of resistance heating.
  • the additional energy offers are provided by temperature supply and / or temperature dissipation.
  • the surface temperature is warmed to a depth of 0.5 mm to 200 ° C by an external heating device in the form of a cylindrical, electrically heated high-performance furnace.
  • an external heating device in the form of a cylindrical, electrically heated high-performance furnace.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Control Of Resistance Heating (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Resistance Heating (AREA)
  • Furnace Details (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)

Claims (5)

1. Procédé de chauffage électrique direct par résistance de pièces métalliques, consistant en outre à exercer dans des périodes déterminées une influence thermique verticalement au sens de conduction du courant en apportant des énergies de l'extérieur, caractérisé en ce que des énergies définies offertes agissent pendant une durée si courte que dans ces périodes aucune compensation de température sur la section transversale de la pièce ne soit possible et que, par conséquent, la répartition thermique verticalement au sens de conduction du courant n'est pas uniforme.
2. Procédé selon la revendication 1, caractérisé en ce que les périodes de l'influence thermique supplémentaire se situent avant le commencement du chauffage par résistance de la pièce.
3. Procédé selon la revendication 1, caractérisé en ce que les périodes se situent dans les périodes du chauffage par résistance de la pièce.
4. Procédé selon la revendication 1, caractérisé en ce que les périodes de l'influence thermique supplémentaire se situent aussi bien avant que dans les durées du chauffage par résistance.
5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que les éngergies offertes sont données par l'apport et/ou l'évacuation de chaleur.
EP82100407A 1981-02-02 1982-01-21 Procédé de chauffage électrique résistant direct de pièces métalliques Expired EP0057385B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD227372 1981-02-02
DD81227372A DD160550A3 (de) 1981-02-02 1981-02-02 Verfahren zur direkten elektrischen widerstandserwaermung von metallischen werkstuecken

Publications (3)

Publication Number Publication Date
EP0057385A2 EP0057385A2 (fr) 1982-08-11
EP0057385A3 EP0057385A3 (en) 1982-08-18
EP0057385B1 true EP0057385B1 (fr) 1986-08-27

Family

ID=5528914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100407A Expired EP0057385B1 (fr) 1981-02-02 1982-01-21 Procédé de chauffage électrique résistant direct de pièces métalliques

Country Status (6)

Country Link
EP (1) EP0057385B1 (fr)
AT (1) ATE21799T1 (fr)
CS (1) CS247109B1 (fr)
DD (1) DD160550A3 (fr)
DE (1) DE3272791D1 (fr)
SU (1) SU1446170A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0340747A3 (fr) * 1988-05-04 1990-06-06 VEB Draht- und Seilwerk Rothenburg Procédé et dispositif pour améliorer la qualité de l'enduction du matériau métallique en forme de barres
WO2000074441A1 (fr) * 1999-06-01 2000-12-07 Mehmet Terziakin Procede de chauffage instantane avec application de courant electrique a la piece dans une operation de formage de metaux a resistance elevee

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704036A (en) * 1924-11-20 1929-03-05 Electric Furnace Co Annealing furnace

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1448787A (fr) * 1964-12-18 1966-03-18 Geoffroy Delore Procédé et dispositif pour le recuit en continu des fils métalliques
DE1583406C3 (de) * 1967-11-15 1974-07-25 Siemens Ag, 1000 Berlin Und 8000 Muenchen Anordnung zum Wärmebehandeln von Stranggut durch elektrische Widerstandserhitzung
DE2538045A1 (de) * 1975-08-27 1977-03-10 Henrich Kg Vorrichtung zum gleichzeitigen erwaermen und/oder gluehen von mehreren durch die vorrichtung laufenden strangfoermigen guetern

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1704036A (en) * 1924-11-20 1929-03-05 Electric Furnace Co Annealing furnace

Also Published As

Publication number Publication date
DD160550A3 (de) 1983-09-14
CS247109B1 (en) 1986-11-13
DE3272791D1 (en) 1986-10-02
EP0057385A2 (fr) 1982-08-11
ATE21799T1 (de) 1986-09-15
EP0057385A3 (en) 1982-08-18
SU1446170A1 (ru) 1988-12-23

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