EP0195077A1 - Procede et appareil de traitement thermique de pieces a usiner - Google Patents

Procede et appareil de traitement thermique de pieces a usiner

Info

Publication number
EP0195077A1
EP0195077A1 EP19850905006 EP85905006A EP0195077A1 EP 0195077 A1 EP0195077 A1 EP 0195077A1 EP 19850905006 EP19850905006 EP 19850905006 EP 85905006 A EP85905006 A EP 85905006A EP 0195077 A1 EP0195077 A1 EP 0195077A1
Authority
EP
European Patent Office
Prior art keywords
heat treatment
furnace
workpieces
charges
rotating hearth
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.)
Withdrawn
Application number
EP19850905006
Other languages
German (de)
English (en)
Inventor
Tomas Barkman
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.)
Volvo AB
Original Assignee
Volvo 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 Volvo AB filed Critical Volvo AB
Publication of EP0195077A1 publication Critical patent/EP0195077A1/fr
Withdrawn legal-status Critical Current

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.
EP19850905006 1984-09-27 1985-09-27 Procede et appareil de traitement thermique de pieces a usiner Withdrawn EP0195077A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843435376 DE3435376C2 (de) 1984-09-27 1984-09-27 Verfahren zur Wärmebehandlung von Werkstücken
DE3435376 1984-09-27

Publications (1)

Publication Number Publication Date
EP0195077A1 true EP0195077A1 (fr) 1986-09-24

Family

ID=6246440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850905006 Withdrawn EP0195077A1 (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)

Families Citing this family (9)

* 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
DE3640325C1 (de) * 1986-11-26 1988-02-04 Ipsen Ind Internat Gmbh Vorrichtung zur Waermebehandlung metallischer Werkstuecke in einer Kohlungsatmosphaere
US4763880A (en) * 1987-04-03 1988-08-16 Holcroft/Loftus Inc. Rotary hearth multi-chamber, multi-purpose furnace system
US5324366A (en) * 1991-08-09 1994-06-28 Caterpillar Inc. Heat treat furnace system for performing different carburizing processes simultaneously
DE4316841A1 (de) * 1993-05-19 1994-11-24 Aichelin Gmbh Vorrichtung zur Wärmebehandlung metallischer Werkstücke
DE29505496U1 (de) * 1995-03-31 1995-06-01 Ipsen Industries International GmbH, 47533 Kleve Vorrichtung zur Wärmebehandlung metallischer Werkstücke unter Vakuum
ATE207546T1 (de) * 1996-08-30 2001-11-15 Franz Hillingrathner Rundtaktofen zum behandeln von werkstücken
DE19919738A1 (de) * 1999-01-29 2000-08-03 Loi Thermprocess Gmbh Durchlaufofen mit einer Einrichtung zum Abschrecken von Werkstücken sowie Abschreckverfahren
DE10310739A1 (de) * 2002-03-27 2003-10-09 Loi Thermprocess Gmbh Anlage zum Wärmebehandeln von Werkstücken

Family Cites Families (12)

* 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
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
US3112918A (en) * 1961-03-28 1963-12-03 Salem Brosius Inc Rotary hearth furnace control
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
JPS58217625A (ja) * 1982-06-09 1983-12-17 Daido Steel Co Ltd 熱処理装置
DE3246371C2 (de) * 1982-12-15 1986-02-06 Ruhrgas Ag, 4300 Essen Wärmebehandlungsofen mit einer kreisringförmigen Transportbahn für die Werkstücke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8602103A1 *

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
WO1986002103A1 (fr) 1986-04-10

Similar Documents

Publication Publication Date Title
EP0195077A1 (fr) Procede et appareil de traitement thermique de pieces a usiner
CA2173058A1 (fr) Dispositif de thermotraitement sous vide de pieces metalliques a usiner
JP3238149B2 (ja) 熱処理プロセスにおいて部品をスケジュールするための制御装置及び方法
US3171759A (en) Method of heat treating high speed steels
US4818303A (en) Method and apparatus for settling sludge
GB2197883A (en) Heat-treatment of metallic workpieces
Montevecchi Product quality and operating economy in large steel carburizing installations controlled by computerized systems.
US4620883A (en) Fluidized-bed heat-treatment method for metallic workpieces
JPH0754055A (ja) 連続焼鈍炉における鋼ストリップの板温制御方法
CN85102651A (zh) 工件热处理方法以及适用于该方法的热处理设备
Mackenzie et al. CFD modelling of quench tank agitation
SU1217893A1 (ru) Автоматизированна лини дл закалки деталей переменного сечени
Panferov Adjustment of Algorithms for Monitoring the Quality of Heating of Metal in Furnaces
Titus An automated method of interrupted quenching in the vacuum furnace
JPS6475613A (en) Method for operating blast furnace
Chmielewski et al. Automatic Control of the Carburizing Process Carried Out in Liquid Organic Compounds in Pit Furnaces.(Retroactive Coverage)
SU1199816A1 (ru) Способ управлени процессом нагрева металла в печи
JP2002146511A (ja) 連続真空浸炭方法
SU1014932A1 (ru) Способ термической обработки изделий
JPH10195546A (ja) 連続焼鈍炉における金属ストリップの板温制御方法
Liscic Flexible Automation in Heat Treatment of Metals
Gustafson Easing the ladle metallurgy bottleneck
JPS57164938A (en) Temperature controlling method for continuous heat treatment furnace
JPS5625933A (en) Temperature controlling method for steel billet in heating furnace
Montevecchi Quality of Production and Economy of Operation in Large Steel Carburising Plants Controlled by Computerised Systems

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19860918

17Q First examination report despatched

Effective date: 19870814

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19871229

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BARKMAN, TOMAS