WO1986002103A1 - Procede et appareil de traitement thermique de pieces a usiner - Google Patents

Procede et appareil de traitement thermique de pieces a usiner Download PDF

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Publication number
WO1986002103A1
WO1986002103A1 PCT/SE1985/000375 SE8500375W WO8602103A1 WO 1986002103 A1 WO1986002103 A1 WO 1986002103A1 SE 8500375 W SE8500375 W SE 8500375W WO 8602103 A1 WO8602103 A1 WO 8602103A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat treatment
furnace
charges
rotating hearth
workpieces
Prior art date
Application number
PCT/SE1985/000375
Other languages
English (en)
Inventor
Tomas Barkman
Original Assignee
Ab Volvo
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 Ab Volvo filed Critical Ab Volvo
Priority to JP60504469A priority Critical patent/JPH08967B2/ja
Publication of WO1986002103A1 publication Critical patent/WO1986002103A1/fr

Links

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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • 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
    • C21D9/0037—Rotary furnaces with vertical axis; Furnaces with rotating floor

Definitions

  • the present invention relates to a process for heat treatment of workpieces of steel or of other alloys, corresponding to different heat treatment profiles, said profile being the same within each charge of workpieces, in an automatic heat treatment installation, whereby the workpieces having the same heat treatment profile are collected in workpiece charges and the workpiece charges are subjected to different heat treatment conditions in a heat treat ⁇ ment furnace, said heat treatment conditions being determined by the furnace atmosphere, the treatment temperature and the treating time.
  • the passage times for the charges are usually fixed, but can some times be adjusted for certain operating conditions.
  • the heat treatment profile determines, as is known, the depth of treatment, for example the case depth which the specifications for the workpiece require.
  • the term heat treatment encompasses both purely thermal treatment and chemical treatment with replacement of substances, in particular carbonization treatment.
  • the workpiece charges are treated in a continuous discharge furnace.
  • the varying heat treatment conditions are set by changing the furnace atmosphere and/or the treatment temperature, since the passage time is preset by the fixed speed of the charges passing in sequence.
  • the conditions are similar when a chamber furnace is used as a heat treatment furnace.
  • the workpieces are held for a predetermined period in order to achieve a given heat treatment profile. If one wishes to achieve different heat treatment profiles with a single furnace, the furnace atmosphere must be appropriately regulated or the temperature must be changed. These regulating procedures require significant down-time periods. This is especially true for carbonization treatment.
  • the heat treatment installations used in the known proces ⁇ ses have for setting the heat treatment condition regulating and control equipment for influencing the furnace atmosphere or the treatment temperature.
  • the purpose of the invention is to conduct the process of the type described, so that the setting of different heat treatment conditions for individual charges does not require changing of the furnace atmosphere and/or the treatment temperature.
  • the invention has the further purpose of providing a particularly simple and reliable heat treatment installation for the process according to the invention.
  • the invention provides a process- whereby the workpiece charges are treated in a rotating hearth furnace.
  • the differing travel paths can be achieved in a particularly simple manner if the workpiece charges are introduced into the rotating hearth furnace through an entry lock and removed from the rotating hearth furnace via at least one exit lock. It lies within the scope of the invention, however, to introduce and remove the charges via a single lock if the treatment cycles so permit.
  • the different distances travelled can be achieved with a rotating hearth rotating in one direction or with a reversible rotating hearth. It is immediately possible to carry out the process according to the invention in such a manner as to be applicable to widely varying workpiece charges and so as to be able to set the appropriate distance travelled automatically from charge to charge.
  • the distance travelled can be controlled with the aid of a computer control means in response to machine readable charge data on the workpiece charges.
  • the invention teaches the procedure of collecting the pieces requiring a particular heat treatment profile and thus a particular case depth, into a single charge and transporting them in this charge through the rotating hearth furnace.
  • the passage through the rotating hearth furnace is regulated so that the staying time to achieve a particular heat treatment profile and thus a particular treatment depth is not exceeded.
  • a workpiece charge will be removed from the furnace at the moment when the heat treatment profile has just been reached.
  • the rotating hearth furnace can then be loaded, for example, via the entry lock. Loading and unloading of the furnace can be controlled so that the turning of the turn-table is kept to a minimum. This is easily achieved by means of a computer.
  • the entire flow of workpieces through the heat treatment installation is controlled by an optimizing calculator for the rotating hearth furnace, depending on the number or workpieces to be treated and the heat treatment profile/treatment depth. If, for example, a controlling computer determines, when looking at the coming flow of materials over a long period of time, that the heat treatment temperature and composition of the furnace atmosphere should be changed to optimize energy consumption, then this should result in an operative resetting. Otherwise the process proceeds from setting to setting according to the invention.
  • the advantages achieved with regard to the process lie in the fact that the composition of the furnace atmosphere and/or the treatment temperature need not be changed in the process according to the invention, thus eliminating the disruptive down-time described above. This ineffective time is reduced almost to the turning time of the turn-table in the rotating hearth furnace.
  • An installation for carrying out the process according to the invention which works with a heat treatment furnace and equipment for setting the heat treatment conditions is characterized in that the heat treatment furnace is a rotating hearth furnace, the furnace atmosphere and the treatment temperature which can be differently adjusted during operation and can be kept constant in the thus adjusted state with the aid of control and/or regulating equipment, and that the equipment operates to set the heat treatment conditions of the rotating hearth and directs the workpiece charges having different heat treatment profiles to different travel paths.
  • the invention will be described below in more detail with reference to a drawing serving only as an example.
  • the single drawing shows an installation for carrying out the process described.
  • the example relates to a carbonization furnace, but applies correspondingly to other heat treatment installations.
  • the primary components of the carbonization installation include a carbonization furnace 1 and equipment 2 for setting the carbonization conditions.
  • the carbonization furnace 1 is a rotating hearth carbonization furnace.
  • the device is designed so that the equipment 3 in the figure adjusts the carbonization atmosphere and the carbonization temperature independently and holds the thus adjusted states constant with the aid of control and/or regulator equipment.
  • the equipment 2 for setting the carbonization conditions is indicated at the bottom of the figure and works on the turn-table. The arrangement is such that this equipment 2 directs workpiece charges with different carbonization profiles to different travel paths. This equipment detects charge data readable on the workpiece charges as indicated by the dash-dot line.
  • the turn-table 4 can rotate forwards and backwards.
  • the figure indicates that a preheating furnace 5 and a heat-up chamber 6 can be added to the rotating hearth furnace and that these two additions can be joined to each other via a lock 7 and that the rotating hearth furnace 1 and the heat-up chamber 6 are connected via an entry lock 8.
  • the example shows an exit lock 9 which is connected to a diffusion chamber 10 and which can be connected via a further lock 11 to an oil bath 12 for example.
  • a manipulator 13 and a hardening press 14 can be connected to the furnace 4.

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)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)

Abstract

Dans un procédé de traitement thermique de pièces à usiner correspondant des profils divers de traitement thermique, ces profils étant les mêmes pour chaque charge de pièces à usiner, les pièces à usiner ayant le même profil de traitement thermique sont rassemblées en charges de pièces à usiner, et ses charges de pièces à usiner sont soumises à des conditions diverses de traitement thermique dans un four de traitement thermique. Les conditions de traitement thermique sont détérminées par l'atmosphère du four, par la température de traitement et par la durée du traitement. Les charges de pièces à usiner sont traitées dans un four à sole rotative (1) dans lequel l'atmosphère du four et la température de traitement sont maintenues constantes. Les différentes conditions de traitement thermique sont obtenues en variant les parcours, donc la durée du traitement, des charges de pièces à usiner dans le four à sole rotative. Un dispositif pour appliquer le procédé est pourvu de l'équipement approprié (2) pour ajuster les conditions de traitement thermique s'exerçant sur la sole rotative.
PCT/SE1985/000375 1984-09-27 1985-09-27 Procede et appareil de traitement thermique de pieces a usiner WO1986002103A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60504469A JPH08967B2 (ja) 1984-09-27 1985-09-27 複数の被加工材チャージの肌焼き方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3435376.3 1984-09-27
DE19843435376 DE3435376C2 (de) 1984-09-27 1984-09-27 Verfahren zur Wärmebehandlung von Werkstücken

Publications (1)

Publication Number Publication Date
WO1986002103A1 true WO1986002103A1 (fr) 1986-04-10

Family

ID=6246440

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1985/000375 WO1986002103A1 (fr) 1984-09-27 1985-09-27 Procede et appareil de traitement thermique de pieces a usiner

Country Status (4)

Country Link
EP (1) EP0195077A1 (fr)
JP (1) JPH08967B2 (fr)
DE (1) DE3435376C2 (fr)
WO (1) WO1986002103A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607231A1 (fr) * 1986-11-26 1988-05-27 Ipsen Ind Int Gmbh Installation de traitement thermique de pieces metalliques sous atmosphere carburante
EP0359756A1 (fr) * 1987-04-03 1990-03-28 Caterpillar Inc. Systeme de four a chambres multiples, a foyer rotatif a usages multiples
EP0530513A1 (fr) * 1991-08-09 1993-03-10 Caterpillar Inc. Système de four de traitement thermique pour réaliser des procédés différents et simultanés de carburation
EP0735149A1 (fr) * 1995-03-31 1996-10-02 Ipsen Industries International Gesellschaft Mit Beschränkter Haftung Dispositif pour le traitement thermique d'articles métalliques sous vide
WO1998008988A1 (fr) * 1996-08-30 1998-03-05 Franz Hillingrathner Four rotatif pour traitement de pieces
US7588719B2 (en) * 2002-03-27 2009-09-15 Loi Thermprocess Gmbh Installation for the heat-treatment of parts

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441338A1 (de) * 1984-11-13 1986-05-15 Ipsen Industries International Gmbh, 4190 Kleve Verfahren zur waermebehandlung metallischer werkstuecke unter verwendung eines durchlauf- oder durchstossofens sowie vorrichtung zum durchfuehren dieses verfahrens
DE4316841A1 (de) * 1993-05-19 1994-11-24 Aichelin Gmbh Vorrichtung zur Wärmebehandlung metallischer Werkstücke
DE19919738A1 (de) * 1999-01-29 2000-08-03 Loi Thermprocess Gmbh Durchlaufofen mit einer Einrichtung zum Abschrecken von Werkstücken sowie Abschreckverfahren

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE684954C (de) * 1937-10-15 1939-12-08 Olga Uhlendorff Geb Engelhardt Selbsttaetige Beschickungs- und Entnahmevorrichtung
FR1072554A (fr) * 1952-12-22 1954-09-14 Chaufferie Et Fumisterie Ind Perfectionnements aux fours à sole tournante, en particulier aux fours à réchauffer les billettes
DE971225C (de) * 1943-10-13 1958-12-31 Aeg Drehherdofen mit angeschlossener Kuehlkammer
FR1218675A (fr) * 1958-12-30 1960-05-12 Salem Brosius S A Holding Fours à soles tournantes
GB920150A (en) * 1961-03-28 1963-03-06 Salem Brosius Inc Rotary hearth furnace control
DE1201380B (de) * 1958-05-07 1965-09-23 Lee Wilson Verfahren und Vorrichtung zur Waerme-behandlung von aufgelockerten Metallbandspulen
EP0098344A1 (fr) * 1982-06-09 1984-01-18 Daidotokushuko Kabushiki Kaisha Dispositif et procédé de traitement thermique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2013905A (en) * 1933-02-04 1935-09-10 Jr James L Adams Circular ingot heating furnace
DE2558032A1 (de) * 1975-12-22 1977-06-23 Ernst Dr Ing Gorissen Drehherdofen mit drehwegsteuerung
JPS5328125A (en) * 1976-08-30 1978-03-16 Toray Ind Inc Adsorption isokation of xylene isomer
DE3209245A1 (de) * 1982-03-13 1983-09-15 Brown, Boveri & Cie Ag, 6800 Mannheim Drehherdofen
DE3246371C2 (de) * 1982-12-15 1986-02-06 Ruhrgas Ag, 4300 Essen Wärmebehandlungsofen mit einer kreisringförmigen Transportbahn für die Werkstücke

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE684954C (de) * 1937-10-15 1939-12-08 Olga Uhlendorff Geb Engelhardt Selbsttaetige Beschickungs- und Entnahmevorrichtung
DE971225C (de) * 1943-10-13 1958-12-31 Aeg Drehherdofen mit angeschlossener Kuehlkammer
FR1072554A (fr) * 1952-12-22 1954-09-14 Chaufferie Et Fumisterie Ind Perfectionnements aux fours à sole tournante, en particulier aux fours à réchauffer les billettes
DE1201380B (de) * 1958-05-07 1965-09-23 Lee Wilson Verfahren und Vorrichtung zur Waerme-behandlung von aufgelockerten Metallbandspulen
FR1218675A (fr) * 1958-12-30 1960-05-12 Salem Brosius S A Holding Fours à soles tournantes
GB920150A (en) * 1961-03-28 1963-03-06 Salem Brosius Inc Rotary hearth furnace control
EP0098344A1 (fr) * 1982-06-09 1984-01-18 Daidotokushuko Kabushiki Kaisha Dispositif et procédé de traitement thermique

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2607231A1 (fr) * 1986-11-26 1988-05-27 Ipsen Ind Int Gmbh Installation de traitement thermique de pieces metalliques sous atmosphere carburante
BE1002059A4 (fr) * 1986-11-26 1990-06-12 Ipsen Ind Internat Ges Mit Bes Installation de traitement thermique de pieces metalliques dans une atmosphere de cementation par le carbone.
EP0359756A1 (fr) * 1987-04-03 1990-03-28 Caterpillar Inc. Systeme de four a chambres multiples, a foyer rotatif a usages multiples
EP0359756A4 (en) * 1987-04-03 1991-01-30 Holcroft/Loftus, Incorporated Rotary hearth multi-chamber multi-purpose furnace system
EP0530513A1 (fr) * 1991-08-09 1993-03-10 Caterpillar Inc. Système de four de traitement thermique pour réaliser des procédés différents et simultanés de carburation
EP0735149A1 (fr) * 1995-03-31 1996-10-02 Ipsen Industries International Gesellschaft Mit Beschränkter Haftung Dispositif pour le traitement thermique d'articles métalliques sous vide
WO1998008988A1 (fr) * 1996-08-30 1998-03-05 Franz Hillingrathner Four rotatif pour traitement de pieces
US5997290A (en) * 1996-08-30 1999-12-07 Hillingrathner; Franz Revolving transfer furnace for treating workpieces
US7588719B2 (en) * 2002-03-27 2009-09-15 Loi Thermprocess Gmbh Installation for the heat-treatment of parts
KR100964994B1 (ko) * 2002-03-27 2010-06-21 로이 섬프로세스 게엠베하 부품 열처리용 장치

Also Published As

Publication number Publication date
DE3435376A1 (de) 1986-05-15
JPS62500310A (ja) 1987-02-05
DE3435376C2 (de) 1996-09-12
JPH08967B2 (ja) 1996-01-10
EP0195077A1 (fr) 1986-09-24

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