EP0093060B1 - Four à sole tournante pour le traitement thermique, thermochimique ou électrothermique de métaux sous atmosphère raréfiée - Google Patents

Four à sole tournante pour le traitement thermique, thermochimique ou électrothermique de métaux sous atmosphère raréfiée Download PDF

Info

Publication number
EP0093060B1
EP0093060B1 EP83400814A EP83400814A EP0093060B1 EP 0093060 B1 EP0093060 B1 EP 0093060B1 EP 83400814 A EP83400814 A EP 83400814A EP 83400814 A EP83400814 A EP 83400814A EP 0093060 B1 EP0093060 B1 EP 0093060B1
Authority
EP
European Patent Office
Prior art keywords
tunnel
enclosure
treatment
parts
hardening
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
EP83400814A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0093060A1 (fr
Inventor
Jean Bares
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.)
Le Traitement Sous Vide SA
Original Assignee
Le Traitement Sous Vide SA
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 Le Traitement Sous Vide SA filed Critical Le Traitement Sous Vide SA
Priority to AT83400814T priority Critical patent/ATE21967T1/de
Publication of EP0093060A1 publication Critical patent/EP0093060A1/fr
Application granted granted Critical
Publication of EP0093060B1 publication Critical patent/EP0093060B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
    • 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
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/042—Vacuum furnaces

Definitions

  • the present invention relates to a rotary hearth furnace for the thermal, thermochemical or electrothermal treatment of metals under a rarefied atmosphere.
  • thermochemical treatment of metals optionally by ion bombardment, comprising, at the end of the treatment cycle, a final treatment, of limited duration, such as quenching.
  • thermochemical vacuum treatment ovens with incorporated quench tank.
  • These ovens generally include a cell equipped with heating and possibly cooling means for the thermal or thermochemical treatment as well as incorporated quenching equipment involving a chamber provided with a quenching tank and communicating with the treatment cell. , via a removable and watertight partition, means being further provided for transferring the parts, from the cell to the quenching tank and vice versa.
  • the invention possibly provides a thermally insulating mobile carrier closing the tunnel on one side of the airlock door, preferably on the side where the parts arrive at the end of treatment.
  • the above-mentioned annular tunnel is interrupted in a sector, of length at least equal to that of the support elements of the parts to be treated, so as to delimit a zone for transferring the parts, this zone transfer located at the right of the interior door of the airlock.
  • two vertical retractable doors made of a thermally insulating material, are preferably provided, to ensure the closure of the two ends of the annular tunnel, on both sides. other from the transfer area.
  • the oven can also include cooling means arranged in the enclosure, outside the annular tunnel, these cooling means being intended to permanently evacuate the heat energy dissipated inside the enclosure by the annular tunnel. , especially when the doors are opened and by the parts in the transfer area at the end of the treatment.
  • the processing means equipping the annular tunnel can be distributed uniformly along this tunnel. They can also consist of a succession of autonomous elements which can be controlled separately by means of a programmable system, in particular to allow custom processing of the parts. These processing means may consist of radiation heating means and / or of ion bombardment processing means.
  • a series of electrodes is then provided, namely a series of carried anodes through the tunnel and a series of cathodes which may consist of the support elements on which the parts to be treated are arranged.
  • These cathodes are supplied by means of an electrical circuit with a rotating joint or else by means of a circular track mounted on the rotating floor ot on which brushes come to bear.
  • This furnace therefore makes it possible to carry out all types of treatment by ion bombardment such as nitriding, carbonitriding, boriding, various cementations, metallic deposits, etc.
  • thermochemical or thermochemical treatment oven The advantage of the previously described thermochemical or thermochemical treatment oven is obvious: firstly, the time of use of the installation of the quenching equipment is multiplied by the number of parts contained inside the oven and its profitability is increased.
  • the rotary hearth furnace shown in these drawings first of all comprises a sealed enclosure 1 connected to means, not shown, for producing a treatment atmosphere inside the enclosure, for example a relative vacuum .
  • This enclosure 1 comprises a substantially cylindrical vertical side wall 2 as well as a cover 3 and a curved bottom 4. The assembly rests on a base 5 produced in a conventional manner.
  • the enclosure 1 has double walls between which a cooling fluid can circulate in a conventional manner.
  • Access to the interior of the enclosure 1 is carried out by means of an airlock 6 mounted against the vertical wall 2 outside the enclosure 1, which is part of the furnace quenching installation.
  • the airlock 6 comprises, giving on the outside, a conventional pivoting door 7 and, giving on the inside of the enclosure 1, a door 8 retractable laterally. It communicates in its lower part with a quenching tank 9 located below the airlock 6.
  • a transfer means 10 allows the transfer of the parts from the outside to the inside of the enclosure 1 and vice versa, as well as immersion parts at the end of treatment in the quench tank 9.
  • a circular raceway 11 is produced on the bottom of the enclosure 1 in a peripheral region substantially adjacent to the cylindrical side wall 2.
  • this raceway 11 is an annular tunnel 12, made of a thermally insulating material, open at its lower face, facing the raceway 11, and equipped with processing means suitable for the use of the furnace, such as electrical resistors 13, electrodes for ion bombardment, nozzles for injection of treatment gas, etc.
  • This tunnel 12 is also interrupted in a sector 14 of about 60 to 70 °, adjacent to the door 8 of the airlock 6, which serves as a transfer area.
  • the two openings of this tunnel can be closed respectively by two thermally insulating doors 15, 16, which can take at least two positions, namely, a retracted position in the central part 17 of the enclosure 1, position obtained by horizontal radial translation, and a slightly raised position, obtained by vertical translation.
  • the displacements of these doors are obtained by means of a system with pulley slides 19 and return cables 20 driven by a motor 21 situated outside the enclosure 1.
  • the lower part of the tunnel 12 is further closed by a rotating floor 22 consisting of a crown of thermally insulating material mounted on the raceway 11 by means of rollers 23 and driven in rotation by means of a motor 24 and a transmission system comprising a pinion 25 meshing with a ring gear 26 secured to the sole 22.
  • This sole 22 carries a series of radial support elements S 1 to 5 9 intended to carry the loads to be treated, at the rate of three support elements S per load.
  • the floor 22 is designed to carry 9 loads making between them an angular difference of 40 °.
  • the invention further provides a system cooling consisting of a coil 28, housed in the cylindrical volume 17 delimited by the tunnel 12 and connected to an external coolant circuit.
  • the charges thus introduced are then entrained by the floor 22 and circulate inside the tunnel 12 in a forward movement step by step.
  • the maximum duration of treatment of these charges corresponds to the time of passage of the charges inside the tunnel 12. In all cases, the return of the charges in the transfer zone takes place at the end of the final treatment phase .
  • the transfer device 10 which equips the airlock 6, comes to extract the charge which has just arrived in the transfer zone 14 and is still at the final treatment temperature, then immerses it in the quench tank 9. At the end of 'quenching operation, the load is extracted from the airlock 6 and the transfer device 10, can receive a new load.
  • the charge transfer zone 14 can correspond to the length of the charges to be treated. In this case there is provided between the loads a sufficient interval to allow the passage of the shutter doors 15 and 16.
  • the sole 22 can then be animated with a stepwise movement whose pitch corresponds to the angular difference between two charges.
  • the doors 15, 16 are controlled so as to close the end of the tunnel 12, at least during each of the stop periods of sole 22.
  • the sole comprises nine groups, each comprising three support elements S 1 to Sg, each of these groups being designed to support a load.
  • the distribution of these groups of support elements S is such that the loads are substantially contiguous and are angularly offset by 40 °.
  • the transfer area extends over approximately 70 ° with a central area of 40 ° in the axis of the airlock.
  • This transfer zone 14 therefore partially covers two groups of consecutive support elements S 4 and S 5 arranged symmetrically with respect to the axis of the airlock 6, as shown in FIG. 2.
  • the movement of the sole is no longer a simple step-by-step movement, but a pilgrim's step movement, comprising a movement of recoil of the sole 22 by 20 ° making it possible to bring a group of support elements S, loaded or not on the central area 30, and then a forward movement of 60 °, so that the result of these two movements corresponds to a forward movement of 40 °.
  • the doors 15 and 16 will be retracted in the case of the passage of a support group S, provided with a load, or simply lifted in the case of the passage of a support group S without load.
  • the invention is not limited to the embodiments described above.
  • access to the interior of the tunnel from the quenching tank could be effected either by means of the watertight door of the quenching tank and / or by a heat shield parallel to this door.
  • the internal wall of the tunnel will only be interrupted for a possible door (15 or 16) isolating the hot zone from the part which has just received the new load.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Tunnel Furnaces (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP83400814A 1982-04-27 1983-04-25 Four à sole tournante pour le traitement thermique, thermochimique ou électrothermique de métaux sous atmosphère raréfiée Expired EP0093060B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83400814T ATE21967T1 (de) 1982-04-27 1983-04-25 Drehherdofen zur thermischen, thermochemischen oder elektrothermischen behandlung von metallen in verduennter atmosphaere.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8207224 1982-04-27
FR8207224A FR2525751A1 (fr) 1982-04-27 1982-04-27 Four a sole tournante pour le traitement thermique, thermochimique ou electrothermique de metaux sous atmosphere rarefiee

Publications (2)

Publication Number Publication Date
EP0093060A1 EP0093060A1 (fr) 1983-11-02
EP0093060B1 true EP0093060B1 (fr) 1986-09-03

Family

ID=9273437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400814A Expired EP0093060B1 (fr) 1982-04-27 1983-04-25 Four à sole tournante pour le traitement thermique, thermochimique ou électrothermique de métaux sous atmosphère raréfiée

Country Status (4)

Country Link
EP (1) EP0093060B1 (enrdf_load_stackoverflow)
AT (1) ATE21967T1 (enrdf_load_stackoverflow)
DE (1) DE3365808D1 (enrdf_load_stackoverflow)
FR (1) FR2525751A1 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4634375A (en) * 1985-03-11 1987-01-06 Hailey Robert W Heating and handling system for metal consolidation process
SE452359C (sv) * 1985-04-30 1994-04-11 Kvaerner Generator Ab Anordning för styrning av värmeövergångstalet vid en CFB-panna
DE102007048041A1 (de) * 2007-10-05 2009-04-09 Loi Thermprocess Gmbh Drehherdofen
DE102008000056A1 (de) * 2008-01-14 2009-07-23 Loi Thermprocess Gmbh Vorrichtung und Verfahren zum Be- und Entladen eines Wärmebehandlungsofens
DE102008020449A1 (de) * 2008-04-01 2009-10-15 Manfred Husslein Industrieofen sowie Verfahren zum Betrieb eines Industrieofens
CN101644532B (zh) * 2009-06-26 2011-05-04 中冶长天国际工程有限责任公司 一种回转窑窑头旋转门
CN104864721B (zh) * 2014-10-17 2017-05-31 安阳强基精密制造产业园股份有限公司 工业窑炉
CN110514017B (zh) * 2019-08-28 2024-05-17 大同新成新材料股份有限公司 一种碳碳复合材料的防氧化涂层热处理设备及其方法
CN112985052A (zh) * 2021-04-09 2021-06-18 江西科技学院 一种隧道式连续烧结炉及其烧结方法
CN113549974B (zh) * 2021-09-22 2021-12-07 南通铭朗建筑机械有限公司 建筑机械配件加工的局部氧化镀膜处理装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1321463A (fr) * 1962-02-05 1963-03-22 Heurtey Sa Four de réchauffage et de traitements thermiques de produits métalliques et notamment de lingots
FR1483242A (fr) * 1966-06-13 1967-06-02 Toyo Kogyo Company Ltd Four pour traitement thermique
US3718324A (en) * 1971-11-12 1973-02-27 Hayes Inc C I Vacuum furnace and work cart for use therein
GB2026663B (en) * 1978-07-26 1982-09-02 Hayes Inc C Continuous heat treating vacuum furnace

Also Published As

Publication number Publication date
FR2525751A1 (fr) 1983-10-28
FR2525751B1 (enrdf_load_stackoverflow) 1984-08-17
EP0093060A1 (fr) 1983-11-02
DE3365808D1 (en) 1986-10-09
ATE21967T1 (de) 1986-09-15

Similar Documents

Publication Publication Date Title
EP0093060B1 (fr) Four à sole tournante pour le traitement thermique, thermochimique ou électrothermique de métaux sous atmosphère raréfiée
EP0995805B9 (fr) Installation pour le traitement thermique d'une charge de pièce métalliques
EP0334433B1 (fr) Reacteur d'épitaxie à planétaire
EP0236639B1 (fr) Installation flexible automatisée de traitement thermochimique rapide
FR2604378A1 (fr) Appareillage de fonderie pour la fabrication de pieces metalliques moulees a structure orientee
FR2537260A1 (fr) Four multicellulaire pour le traitement thermique, thermochimique ou electrothermique de metaux sous atmosphere rarefiee
FR2502180A1 (fr) Four pour le traitement thermique partiel de la zone de travail de forets et outils analogues
EP0533615B1 (fr) Installation pour le traitement thermique de charges successives
EP0388333A1 (fr) Dispositif pour l'exécution de traitements thermiques enchainés en continu sous vide
FR2568360A1 (fr) Four a sole tournante de structure annulaire pour traitement thermique de pieces
EP0309354B1 (fr) Installation automatique de traitement thermochimique rapide
EP0040565B1 (fr) Appareil électrique de cuisson par application séquentielle d'infrarouges et de micro-ondes
EP0785402B1 (fr) Installation pour le traitement thermique d'une charge de pièces métalliques
FR2719893A1 (fr) Dispositif de chargement d'un four spatial automatique.
EP0209408A1 (fr) Installation de traitements thermochimiques à températures et atmosphères différentes, notamment pour l'industrie automobile
EP1130323A1 (fr) Foyer multifunctionnel
EP1080235B1 (fr) Procede de reduction d'oxydes metalliques et dispositif pour la mise en oeuvre du procede
FR2503853A1 (fr) Four industriel
EP0747493A2 (fr) Installation de traitement thermique
FR2487492A1 (fr) Four pour traitement thermique ou thermochimique en continu de metaux
US4938458A (en) Continuous ion-carburizing and quenching system
FR2698683A1 (fr) Dispositif de chargement de four spatial automatique.
FR2487491A1 (fr) Four a passage sous vide pour le traitement thermique ou thermochimique en continu de metaux
FR2689225A1 (fr) Four pour traitement sous vide ou sous atmosphère gazeuse et pour trempe sous pression.
EP0477117B1 (fr) Dispositif modulaire flexible de traitements thermiques

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

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

17P Request for examination filed

Effective date: 19840328

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

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

REF Corresponds to:

Ref document number: 21967

Country of ref document: AT

Date of ref document: 19860915

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3365808

Country of ref document: DE

Date of ref document: 19861009

ITF It: translation for a ep patent filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19910328

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19910329

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19910403

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19910409

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910417

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19910425

Year of fee payment: 9

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19910430

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19910610

Year of fee payment: 9

EPTA Lu: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19920425

Ref country code: GB

Effective date: 19920425

Ref country code: AT

Effective date: 19920425

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19920426

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19920430

Ref country code: CH

Effective date: 19920430

Ref country code: BE

Effective date: 19920430

BERE Be: lapsed

Owner name: LE TRAITEMENT SOUS VIDE

Effective date: 19920430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19921101

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930101

EUG Se: european patent has lapsed

Ref document number: 83400814.6

Effective date: 19921108