EP0106113B1 - Procédé et installation pour recuire à blanc des pièces métalliques en utilisant l'azote comme gaz de protection - Google Patents

Procédé et installation pour recuire à blanc des pièces métalliques en utilisant l'azote comme gaz de protection Download PDF

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Publication number
EP0106113B1
EP0106113B1 EP83108799A EP83108799A EP0106113B1 EP 0106113 B1 EP0106113 B1 EP 0106113B1 EP 83108799 A EP83108799 A EP 83108799A EP 83108799 A EP83108799 A EP 83108799A EP 0106113 B1 EP0106113 B1 EP 0106113B1
Authority
EP
European Patent Office
Prior art keywords
nitrogen
bright annealing
annealed
cooling line
liquid nitrogen
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
EP83108799A
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German (de)
English (en)
Other versions
EP0106113A1 (fr
Inventor
Gottfried Böhm
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to AT83108799T priority Critical patent/ATE23197T1/de
Publication of EP0106113A1 publication Critical patent/EP0106113A1/fr
Application granted granted Critical
Publication of EP0106113B1 publication Critical patent/EP0106113B1/fr
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    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material

Definitions

  • the invention relates to a method and a device for bright annealing of metallic workpieces with nitrogen as protective gas according to the preamble of claim 1.
  • the workpieces are annealed under protective gas and then cooled.
  • cold fuel gas, air and water are used as the cooling medium.
  • Either exogas or nitrogen is used as the protective gas.
  • liquid nitrogen is evaporated in an air evaporator and, like the exogas, introduced at several points in the annealing furnace and the cooling section. The valuable cold of liquid nitrogen is lost unused. From FR-C 2 379 607 it is also known to introduce liquid nitrogen into a furnace for the treatment of metallic workpieces in order to achieve certain structural changes due to the strong cooling.
  • the invention is based on the object of improving the bright annealing process with nitrogen as a protective gas in such a way that, while simultaneously utilizing the cold content of the liquid nitrogen, the system costs are reduced and an increase in performance and, at least in the case of some metals, an improvement in quality becomes possible.
  • a device for performing the method is specified in claim 2. Due to the spray direction of 15 ° to 20 ° deviating from the vertical and against the direction of movement of the annealing material, there is an optimal heat exchange between the annealing material and liquid nitrogen, as well as excellent flow conditions for the vaporized nitrogen through the cooling section and the bright annealing furnace.
  • the nitrogen consumption is the same.
  • the liquid nitrogen is evaporated in the cooling section, there is no need to set up an air evaporator.
  • an increase in performance is possible due to the greater cooling of the workpieces and an improvement in quality, at least for some metals. Because of the strong cooling of the workpieces in the method according to the invention, they no longer start after leaving the cooling section, in contrast to methods according to the prior art.
  • liquid nitrogen When using liquid nitrogen according to the invention, 152 kg / h of liquid nitrogen, which corresponds to 130 m 3 / h of gaseous nitrogen, were required.
  • the outlet temperature of the copper pipes or copper coils was only 95 ° C, so that the workpieces no longer started.
  • a bright annealing furnace 1 is shown in section, at the input of an inlet section 2 and at the output of a cooling section 3 are connected.
  • the annealed material is conveyed on transport rollers 4 through the bright annealing furnace 1, the direction of movement of the annealed material is indicated by arrow 5.
  • Nitrogen serves as protective gas, which is supplied in liquid form from the insulated tank 6 and through the insulated line 7 to the bright annealing furnace 1.
  • the liquid nitrogen is sprayed directly into the end region 8 of the cooling section 3 at an angle of 15 ° to 20 ° deviating from the vertical and counter to the direction of movement of the annealing material, without prior evaporation.
  • the metering takes place by means of a regulating valve 9, in addition, conventional conveying and monitoring devices, such as phase separators, thermometers and manometers, which are not shown in the drawing, are provided.
  • the sprayed-in liquid nitrogen evaporates by heat exchange with the still hot annealing material, flows in gaseous form through the cooling section 3 and the bright annealing furnace 1 and leaves the plant through the inlet section 2.
  • the direction of flow of the gaseous nitrogen is indicated by an arrow 10.
  • FIGS. 2 and 3 Details of the spraying of the liquid nitrogen into the cooling section 3 are shown in FIGS. 2 and 3.
  • the nozzle assembly 12 is arranged in the ceiling 11, to which the liquid nitrogen is supplied through the control valve 9.
  • There are bores in the nozzle assembly 12 which are arranged in this way are that the liquid nitrogen exits at an angle of 15 ° deviating from the vertical against the direction of movement of the annealing material 13, as shown in FIG. 3.
  • the sprayed liquid nitrogen thus impinges almost perpendicularly on the annealing material 13, which causes an intensive heat exchange and rapid evaporation of the nitrogen.
  • a movement toward the annealing furnace 1 and the inlet section 2 is impressed on the nitrogen.
  • the invention is not limited to this device.
  • the outlet angle of 15 ° to 20 ° can also be achieved, for example, by angling the inlet pipe for the liquid nitrogen in the cooling section 3 accordingly.
  • Several nozzle assemblies can also be arranged one behind the other.

Claims (2)

1. Procédé pour recuire à blanc des pièces métalliques dans un four de recuit à blanc (1) suivi d'un chemin de refroidissement (3) et en utilisant comme gaz protecteur de l'azote vaporisé à partir de la phase liquide, caractérisé en ce que l'azote est pulivérisé à l'état liquide dans la zone d'extrémité (8) du chemin de refroidissement sur les pièces recuites, suivant un angle de 15° à 20° par rapport à la verticale dans la direction opposée à la direction de déplacement des pièces (13).
2. Installation pour la mise en oeuvre du procédé selon la revendication 1, composée d'un four de recuit à blanc et d'un chemin de refroidissement adjacent, caractérisée par un ensemble de buses (12) comportant des buses pour pulvériser de l'azote liquide sur les pièces, dans la zone d'extrémité (8) du chemin de refroidissement (3), sous son plafond (11) transversalement à la direction de déplacement des pièces (13), les buses étant disposées suivant un angle de 15 à 20° par rapport à la verticale dans la direction opposée à la direction de déplacement des pièces.
EP83108799A 1982-09-21 1983-09-07 Procédé et installation pour recuire à blanc des pièces métalliques en utilisant l'azote comme gaz de protection Expired EP0106113B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83108799T ATE23197T1 (de) 1982-09-21 1983-09-07 Verfahren und vorrichtung zum blankgluehen von metallischen werkstuecken mit stickstoff als schutzgas.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3234863A DE3234863C2 (de) 1982-09-21 1982-09-21 Verfahren und Vorrichtung zum Blankglühen von metallischen Werkstücken mit Stickstoff als Schutzgas
DE3234863 1982-09-21

Publications (2)

Publication Number Publication Date
EP0106113A1 EP0106113A1 (fr) 1984-04-25
EP0106113B1 true EP0106113B1 (fr) 1986-10-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108799A Expired EP0106113B1 (fr) 1982-09-21 1983-09-07 Procédé et installation pour recuire à blanc des pièces métalliques en utilisant l'azote comme gaz de protection

Country Status (5)

Country Link
US (1) US4515645A (fr)
EP (1) EP0106113B1 (fr)
AT (1) ATE23197T1 (fr)
DE (1) DE3234863C2 (fr)
ZA (1) ZA836972B (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3501463A1 (de) * 1985-01-17 1986-07-17 Linde Ag, 6200 Wiesbaden Verfahren und vorrichtung zur waermebehandlung von werkstuecken
US4643401A (en) * 1985-08-28 1987-02-17 Mg Industries Apparatus for cooling a vacuum furnace
JPH01287221A (ja) * 1988-05-13 1989-11-17 Usui Internatl Ind Co Ltd 金属製長尺材の高周波熱処理方法及びその装置
DE4234285A1 (de) * 1992-10-10 1994-04-14 Heimsoth Verwaltungen Verfahren zur Wärmebehandlung von metallischem Gut
DE19652607A1 (de) * 1996-12-18 1998-06-25 Messer Griesheim Gmbh Verfahren zum kleberfreien Glühen von Buntmetallteilen
EP0949348A1 (fr) * 1998-04-09 1999-10-13 Alusuisse Technology & Management AG Procédé pour le refroidissement controlé de bandes et de profiles en alliage d'aluminium
US6228187B1 (en) * 1998-08-19 2001-05-08 Air Liquide America Corp. Apparatus and methods for generating an artificial atmosphere for the heat treating of materials
DE10054765A1 (de) * 2000-11-04 2002-05-16 Messer Griesheim Gmbh Wärmebehandlungsofen mit Tiefkühlsystem
DE102004054627A1 (de) * 2004-11-11 2006-05-18 Linde Ag Vorrichtung zum Kühlen von langen Gegenständen
US20060266793A1 (en) * 2005-05-24 2006-11-30 Caterpillar Inc. Purging system having workpiece movement device
DE102007057855B3 (de) 2007-11-29 2008-10-30 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Formbauteils mit mindestens zwei Gefügebereichen unterschiedlicher Duktilität

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE671046C (de) * 1934-08-30 1939-01-30 Aeg Verfahren zum Abkuehlen von in elektrisch beheizten Blankgluehdurchlaufoefen erhitztem metallischem Gut
FR845086A (fr) * 1938-02-18 1939-08-10 Procédé et dispositif pour le traitement thermique des objets métalliques
US3036825A (en) * 1957-05-17 1962-05-29 Eisenmenger Friedrich Process and apparatus for the continuous heat treating of elongated material
US3189490A (en) * 1962-11-05 1965-06-15 United States Steel Corp Method and apparatus for quenching pipe
US3407099A (en) * 1965-10-22 1968-10-22 United States Steel Corp Method and apparatus for spraying liquids on the surface of cylindrical articles
US3507712A (en) * 1967-09-08 1970-04-21 United States Steel Corp Method and apparatus for quenching pipe
SE7513756L (sv) * 1975-12-05 1977-06-06 Fagersta Ab Sett och anleggning for framstellning av stalgot med liten tversektionsarea
FR2379607A1 (fr) * 1977-02-03 1978-09-01 Vide & Traitement Sa Procede pour le traitement thermique de metaux

Also Published As

Publication number Publication date
DE3234863C2 (de) 1986-04-10
EP0106113A1 (fr) 1984-04-25
US4515645A (en) 1985-05-07
ZA836972B (en) 1984-05-30
DE3234863A1 (de) 1984-03-22
ATE23197T1 (de) 1986-11-15

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