EP0088995B1 - Rotary hearth furnace - Google Patents

Rotary hearth furnace Download PDF

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Publication number
EP0088995B1
EP0088995B1 EP83102289A EP83102289A EP0088995B1 EP 0088995 B1 EP0088995 B1 EP 0088995B1 EP 83102289 A EP83102289 A EP 83102289A EP 83102289 A EP83102289 A EP 83102289A EP 0088995 B1 EP0088995 B1 EP 0088995B1
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EP
European Patent Office
Prior art keywords
furnace
rotary hearth
door
exit door
exit
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
EP83102289A
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German (de)
French (fr)
Other versions
EP0088995A1 (en
Inventor
Horst Gillhaus
Wolfgang Faber
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.)
EON Ruhrgas AG
Original Assignee
Ruhrgas AG
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Filing date
Publication date
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Priority to AT83102289T priority Critical patent/ATE21167T1/en
Publication of EP0088995A1 publication Critical patent/EP0088995A1/en
Application granted granted Critical
Publication of EP0088995B1 publication Critical patent/EP0088995B1/en
Expired legal-status Critical Current

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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
    • 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
    • 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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • 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
    • F27B9/045—Furnaces with controlled atmosphere

Definitions

  • the invention relates to a rotary hearth furnace with a cylindrical or angular furnace space and a rotating furnace floor which is divided into individual cooker segments and with an inlet and outlet door, the width of which corresponds to the width of the cooker segments.
  • Such rotary hearth furnaces are known as heat treatment furnaces with cylindrical or angular furnace space and rotating floor.
  • the parts to be treated are placed on the slowly rotating furnace floor and move through the various heating zones.
  • the new batch then moves from the infeed step by step through the different batch locations to the picking position.
  • it first passes through the heating zone and then the zone for keeping the desired temperature constant.
  • the rotary hearth furnace therefore has an asymmetrical heating density along the circumference.
  • Double gas curtain devices are provided at the door openings to prevent air from entering.
  • the inner gas curtain is intended for inert gas operation, the outer gas curtain for gas air mixtures.
  • the gas curtains are automatically switched on via solenoid valves and ignited from the inside of the furnace or from an electrically monitored ignition lamp.
  • Such a rotary hearth furnace has proven itself in its form as a continuous furnace for heat treatment. It has also already been stated to operate the rotary hearth furnace as a batch furnace, which means that it can be fully loaded and after the entire contents of the furnace have been heated it is emptied again. However, this type of use as a batch furnace does not increase the scope of the rotary hearth furnace.
  • the object of the invention is therefore to operate a rotary hearth furnace and to provide it with additional devices in such a way that its field of application is considerably improved.
  • each exit door is connected to a further processing device (quenching bath, hardening press or the like), possibly with the interposition of a lock.
  • each exit door e.g. quench baths with different quenching temperatures, hardness press or the like.
  • the exit door is advantageously connected to the associated further processing device via a lock in order to avoid disturbances in the gas atmosphere.
  • the furnace shown in Figure 1 consists of the heat insulated furnace walls 1, which shield the interior of the furnace from the outside air.
  • An entrance door E and up to three exit doors A1, A2, A3 are provided in these insulating walls 1. All three possible exit doors are shown in this horizontal section.
  • Heating elements 2 are provided in the furnace interior delimited by the insulating walls 1.
  • the grids R1, R2, R3 and R4 are located on a turntable D which rotates about the axis X.
  • the turntable D is fed through the entrance door E with these grates and the batch to be treated, the turntable being rotated by a rotating unit which corresponds to the angle of a grate after each insertion of a grate. If the batch intended for the furnace is present in the furnace, the temperature is increased and the intended heat treatment can be carried out. Depending on the further treatment after the goods have been heated, the grates with the batch leave the oven via exit doors A1 or A2 or ⁇ A3.
  • Fig. 2 shows an embodiment of a rotary hearth furnace system with two quenching baths.
  • the furnace 10 is fed through the entrance door E, which is preceded by a lock S1.
  • the grids are provided on tracks 11 and 12 and can leave the furnace including the batch via the exit door A2 or A3.
  • Quench bath 17 is connected downstream of output A2 via lock S3, and quench bath 13 is connected downstream of output A3 via lock S4.
  • a warm salt bad and an oil bath can be used for the bath 13.
  • quenching baths of the same type can also be used, which differ in temperature.
  • the emptied grates may be fed to the washing machine 15 with a new batch. Finally, the grates pass the tempering furnace 16 with a new batch.
  • the exit door A1 is followed by a further bathroom 18 via a lock S2.
  • the bath 18 can be designed as a water bath. However, it can also be a salt hot bath or an oil hot bath which differs in temperature from baths 13 and 17, respectively.
  • the arrangement of the washing machine 15 and the starting furnace 16 corresponds to the statements in FIG. 2.
  • the exit door A2 is followed by a manipulator or robot 20.
  • This robot removes the heated objects and places them in a further processing device, e.g. B. a hardness press 21.
  • the exit door A3 is followed by a quench bath 13 via a lock.
  • the arrangement of the washing machine 15 and the starting furnace 16 also corresponds to the previous figures.
  • the invention shown in Figures 1 to 4 enables a universally applicable rotary hearth furnace.
  • the flexibility of an oven system can be increased considerably.
  • batches of different quality can be subjected to different heat treatments at short intervals.
  • the advantage of the rotary hearth furnace system can be seen in the lower investment costs.
  • a chamber furnace system with the same flexibility would require three furnaces.
  • it must be taken into account that such a rotary hearth batch furnace has the lowest energy consumption, since it can be used better and has little downtime like a chamber furnace system.

Abstract

1. A rotary hearth furnace with a cylindrical or an angular furnace chamber and a rotary furnace floor divided into furnace sections and fitted with inlet and exit doors, the width of each such door corresponding with the width of each such furnace section characterized in that said furnace is provided with more than one exit door (A1, A2, A3) and that each such exit door is connected with a downstream treatment facility (13, 17, 18, 20) and in that a vestibule (S2, S3, S4) may be provided between each such exit door and each such downstream treatment facility.

Description

Die Erfindung bezieht sich auf einen Drehherdofen mit zylindrischem oder eckigem Ofenraum und sich drehendem Ofenboden, der in einzelne Herdsegmente aufgeteilt ist und mit Ein-und Auslaßtür, deren Breite mit der Breite der Herdsegmente korrespondieren.The invention relates to a rotary hearth furnace with a cylindrical or angular furnace space and a rotating furnace floor which is divided into individual cooker segments and with an inlet and outlet door, the width of which corresponds to the width of the cooker segments.

Derartige Drehherdöfen sind als Wärmebehandlungsöfen mit zylindrischem oder eckigem Ofenraum und rotierendem Boden bekannt. Die zu behandelnden Teile werden auf den sich langsam drehenden Ofenboden gelegt und wandern so durch die verschiedenen Beheizungszonen.Such rotary hearth furnaces are known as heat treatment furnaces with cylindrical or angular furnace space and rotating floor. The parts to be treated are placed on the slowly rotating furnace floor and move through the various heating zones.

Der Vorteil dieser Drehherdöfen als Wärmebehandlungsofen liegt darin, daß für den Transport der Charge innerhalb des Ofens keine Übertragungselemente erforderlich sind. Die Charge ruht auf dem rotierenden Herdboden, der außen im Kalten gelagert ist und von einem außenliegenden Antrieb gedreht wird. Im allgemeinen werden Öfen mit einer besonderen Einlaßtür und einer besonderen Auslaßtür verwendet. Bei diesen Drehherdöfen ist zwischen Einlauf und Auslauf ein Leerplatz vorhanden, so daß der Ofenanfang vom Ofenende getrennt wird. Hierdurch treten die Nachteile nicht auf, die bei Verwendung nur einer Tür als Einlaß- und Auslaßtür auftreten, da hier die eingebrachte kalte Charge ohne Trennung neben eine fertig behandelte warme Charge plaziert wird. Im allgemeinen wird der Drehherdofen taktweise betrieben und es kann also nur immer dann eine Charge eingebracht werden, wenn vorher eine Charge entnommen wurde. Die neue Charge fährt dann vom Einlauf schrittweise über die verschiedenen Chargenplätze bis zur Entnahmeposition. Hierbei durchfährt sie zunächst die Aufheizzone und dann die Zone zur Konstanthaltung der gewünschten Temperatur. Der Drehherdofen besitzt also eine unsymmetrische Heizungsdichte am Umfang entlang. An den Türöffnungen sind doppelte Gasschleiereinrichtungen vorgesehen, die den Luftzutritt unterbinden. Der innere Gasschleier ist für Schutzgasbetrieb, der äußere Gasschleier für Gasluftgemische vorgesehen. Die Gasschleier werden automatisch über Magnetventile eingeschaltet und vom Ofeninneren bzw. von elektrisch überwachter Zündlunten aus gezündet.The advantage of these rotary hearth furnaces as heat treatment furnaces is that no transfer elements are required for the transport of the batch within the furnace. The batch rests on the rotating hearth, which is stored outside in the cold and is rotated by an external drive. Stoves with a special inlet door and a special outlet door are generally used. In these rotary hearth furnaces, there is an empty space between the inlet and the outlet, so that the beginning of the furnace is separated from the end of the furnace. This does not give rise to the disadvantages that occur when only one door is used as the inlet and outlet door, since the cold batch introduced is placed next to a finished, warm batch without separation. In general, the rotary hearth furnace is operated intermittently and a batch can only be introduced if a batch has been removed beforehand. The new batch then moves from the infeed step by step through the different batch locations to the picking position. Here, it first passes through the heating zone and then the zone for keeping the desired temperature constant. The rotary hearth furnace therefore has an asymmetrical heating density along the circumference. Double gas curtain devices are provided at the door openings to prevent air from entering. The inner gas curtain is intended for inert gas operation, the outer gas curtain for gas air mixtures. The gas curtains are automatically switched on via solenoid valves and ignited from the inside of the furnace or from an electrically monitored ignition lamp.

Ein derartiger Drehherdofen hat sich in seiner Form als Durchlaufofen zur Wärmebehandlung bewährt. Es ist auch schon angegeben worden, den Drehherdofen als Chargenofen zu betreiben, das heißt, er kann voll beladen werden und nach der Erwärmung des ganzen Ofeninhalts wird er wieder entleert. Diese Art der Verwendung als Chargenofen vergrößert jedoch den Anwendungsbereich des Drehherdofens nicht.Such a rotary hearth furnace has proven itself in its form as a continuous furnace for heat treatment. It has also already been stated to operate the rotary hearth furnace as a batch furnace, which means that it can be fully loaded and after the entire contents of the furnace have been heated it is emptied again. However, this type of use as a batch furnace does not increase the scope of the rotary hearth furnace.

Aufgabe der Erfindung ist es daher einen Drehherdofen derart zu betreiben und mit Zusatzeinrichtungen zu versehen, daß sein Anwendungsbereich erheblich verbessert wird.The object of the invention is therefore to operate a rotary hearth furnace and to provide it with additional devices in such a way that its field of application is considerably improved.

Die gestellte Aufgabe wird gemäß der Erfindung dadurch gelöst, daß mehr als eine Ausgangstür vorgesehen ist und jede Ausgangstür ggf. unter Zwischenschaltung einer Schleuse mit einer Weiterbehandlungseinrichtung (Abschreckbad, Härtepresse o. dgl.) verbunden ist.The object is achieved according to the invention in that more than one exit door is provided and each exit door is connected to a further processing device (quenching bath, hardening press or the like), possibly with the interposition of a lock.

Es ist besonders vorteilhaft, jeder Ausgangstür eine andere Weiterbehandlungseinrichtung (z. B. Abschreckbäder mit verschiedenen Abschreck- . temperaturen, Härtepresse o. dgl.) zuzuordnen. Die Ausgangstür ist vorteilhaft mit der zugeordneten Weiterbehandlungseinrichtung über eine Schleuse verbunden, um Störungen der Gasatmosphäre zu vermeiden.It is particularly advantageous to assign a different further treatment device to each exit door (e.g. quench baths with different quenching temperatures, hardness press or the like). The exit door is advantageously connected to the associated further processing device via a lock in order to avoid disturbances in the gas atmosphere.

Die Figuren zeigen schematische Ausführungsbeispiele der Erfindung.The figures show schematic embodiments of the invention.

Es zeigen :

  • Figur 1 einen horizontalen Schnitt durch einen Drehherdofen gemäß der Erfindung,
  • Figur 2 eine Drehherdofenanlage mit zwei Abschreckbädern,
  • Figur 3 eine Drehherdofenanlage mit drei Abschreckbädern,
  • Figur 4 eine Drehherdofenanlage mit zwei Ausgangstüren, wobei einer Ausgangstür ein Abschreckbad und der anderen ein Roboter zur Entnahme der Chargenteile zugeordnet ist.
Show it :
  • FIG. 1 shows a horizontal section through a rotary hearth furnace according to the invention,
  • FIG. 2 shows a rotary hearth furnace system with two quenching baths,
  • FIG. 3 shows a rotary hearth furnace system with three quenching baths,
  • FIG. 4 shows a rotary hearth furnace system with two exit doors, one exit door being assigned a quench bath and the other a robot for removing the batch parts.

Der in Figur 1 dargestellte Ofen besteht aus den gegen Wärme isolierten Ofenwänden 1, die den Ofeninnenraum gegenüber der Außenluft abschirmen. In diesen lsolierwänden 1 sind eine Eingangstür E und bis zu drei Ausgangstüren A1, A2, A3 vorgesehen. In diesem horizontalen Schnitt sind alle drei möglichen Ausgangstüren dargestellt. In dem von den Isolierwänden 1 begrenzten Ofeninnenraum sind Heizelemente 2 vorgesehen. Auf einem Drehteller D, der sich um die Achse X dreht, befinden sich die Roste R1, R2, R3 und R4. Der Drehteller D wird durch die Eingangstür E mit diesen Rosten und der zu behandelnden Charge beschickt, wobei nach jedem Einbringen eines Rostes der Drehteller um eine Dreheinheit, die dem Winkel eines Rostes entspricht, gedreht wird. Ist die für den Ofen vorgesehene Charge im Ofen vorhanden, so wird die Temperatur erhöht und die vorgesehene Wärmebehandlung kann durchgeführt werden. Je nach der weiteren Behandlung nach der Erwärmung des Gutes verlassen die Roste mit der Charge über die Ausgangsstüren A1 oder A2 oder ` A3 den Ofen.The furnace shown in Figure 1 consists of the heat insulated furnace walls 1, which shield the interior of the furnace from the outside air. An entrance door E and up to three exit doors A1, A2, A3 are provided in these insulating walls 1. All three possible exit doors are shown in this horizontal section. Heating elements 2 are provided in the furnace interior delimited by the insulating walls 1. The grids R1, R2, R3 and R4 are located on a turntable D which rotates about the axis X. The turntable D is fed through the entrance door E with these grates and the batch to be treated, the turntable being rotated by a rotating unit which corresponds to the angle of a grate after each insertion of a grate. If the batch intended for the furnace is present in the furnace, the temperature is increased and the intended heat treatment can be carried out. Depending on the further treatment after the goods have been heated, the grates with the batch leave the oven via exit doors A1 or A2 or `A3.

Fig. 2 zeigt eine Ausführung einer Drehherdofenanlage mit zwei Abschreckbädern. Der Ofen 10 wird über die Eingangstür E, der eine Schleuse S1 vorgeschaltet ist, beschickt. Die Roste sind auf den Bahnen 11 und 12 bereitgestellt und können einschließlich der Charge den Ofen über die Ausgangstür A2 oder A3 verlassen. Dem Ausgang A2 ist über die Schleuse S3 das Abschreckbad 17 nachgeschaltet, und dem Ausgang A3 ist über die Schleuse S4 das Abschreckbad 13 nachgeschaltet. Für das Bad 17 kann bsw. ein Salzwarmbad und für das Bad 13 ein Ölbad verwendet werden. Es können jedoch auch Abschreckbäder gleicher Art benutzt werden, die- sich in der Temperatur unterscheiden. Die entleerten Roste werden ggf. mit einer neuen Charge der Waschmaschine 15 zugeführt. Abschließend passieren die Roste mit einer neuen Charge den Anlaßofen 16. Über die Transportbahnen 12 und 11 gelangen die Roste einschließlich der auf ihnen befindlichen Charge zur Eingangstür E.Fig. 2 shows an embodiment of a rotary hearth furnace system with two quenching baths. The furnace 10 is fed through the entrance door E, which is preceded by a lock S1. The grids are provided on tracks 11 and 12 and can leave the furnace including the batch via the exit door A2 or A3. Quench bath 17 is connected downstream of output A2 via lock S3, and quench bath 13 is connected downstream of output A3 via lock S4. For the bathroom 17 bsw. a warm salt bad and an oil bath can be used for the bath 13. However, quenching baths of the same type can also be used, which differ in temperature. The emptied grates may be fed to the washing machine 15 with a new batch. Finally, the grates pass the tempering furnace 16 with a new batch. The grids, including the batch located on them, reach the entrance door E via the conveyor tracks 12 and 11.

In Fig. 3 ist der Ausgangstür A1 ein weiteres Bad 18 über eine Schleuse S2 nachgeschaltet. Das Bad 18 kann als Wasserbad ausgebildet sein. Es kann sich jedoch auch um ein Salzwarmbad oder ein Ölwarmbad handeln, das sich von den Bädern 13 bzw. 17 in der Temperatur unterscheidet. Die Anordnung der Waschmaschine 15 und des Anlaßofens 16 entspricht den Ausführungen in Figur 2.In Fig. 3, the exit door A1 is followed by a further bathroom 18 via a lock S2. The bath 18 can be designed as a water bath. However, it can also be a salt hot bath or an oil hot bath which differs in temperature from baths 13 and 17, respectively. The arrangement of the washing machine 15 and the starting furnace 16 corresponds to the statements in FIG. 2.

Die Fig. 4 zeigt eine andere Ausführungsform ; hier ist der Ausgangstür A2 ein Manipulator bzw. Roboter 20 nachgeschaltet. Dieser Roboter entnimmt die erwärmten Gegenstände und legt sie in eine Weiterverarbeitungseinrichtung, z. B. eine Härtepresse 21 ein. Der Ausgangstür A3 ist wie in den vorhergehenden Figuren ein Abschreckbad 13 über eine Schleuse nachgeschaltet. Die Anordnung der Waschmaschine 15 und des Anlaßofens 16 entspricht ebenfalls den vorhergehenden Figuren.4 shows another embodiment; here, the exit door A2 is followed by a manipulator or robot 20. This robot removes the heated objects and places them in a further processing device, e.g. B. a hardness press 21. As in the previous figures, the exit door A3 is followed by a quench bath 13 via a lock. The arrangement of the washing machine 15 and the starting furnace 16 also corresponds to the previous figures.

Die in den Figuren 1 bis 4 dargestellte Erfindung ermöglicht einen universal einsetzbaren Drehherdofen. Durch den Anbau von mehreren Abschreckbädern an einen derartigen Ofen kann die Flexibilität einer Ofenanlage erheblich vergrößert werden. Für viele Härtereien können in kurzen Abständen Chargen verschiedenster Qualität verschiedenen Wärmebehandlungen unterzogen werden. Der Vorteil der Drehherdofenanlage ist in den geringeren Investitionskosten zu sehen. Ein Kammerofensystem mit der gleichen Flexibilität würde drei Öfen erfordern. Außerdem muß berücksichtigt werden, daß ein derartiger Drehherdchargenofen den geringsten Energieverbrauch besitzt, da er besser genutzt werden kann und nur wenig Stillstandzeiten hat wie eine Kammerofenanlage.The invention shown in Figures 1 to 4 enables a universally applicable rotary hearth furnace. By installing several quenching baths on such an oven, the flexibility of an oven system can be increased considerably. For many hardening shops, batches of different quality can be subjected to different heat treatments at short intervals. The advantage of the rotary hearth furnace system can be seen in the lower investment costs. A chamber furnace system with the same flexibility would require three furnaces. In addition, it must be taken into account that such a rotary hearth batch furnace has the lowest energy consumption, since it can be used better and has little downtime like a chamber furnace system.

Außerdem ist möglich, einen bestehenden Drehherdofen noch nachträglich in einfachster Weise zu erweitern.It is also possible to easily expand an existing rotary hearth furnace later.

Claims (3)

1. A rotary hearth furnace with a cylindrical or an angular furnace chamber and a rotary furnace floor divided into furnace sections and fitted with inlet and exit doors, the width of each such door corresponding with the width of each such furnace section characterized in that said furnace is provided with more than one exit door (A1, A2, A3) and that each such exit door is connected with a downstream treatment facility (13, 17, 18, 20) and in that a vestibule (S2, S3, S4) may be provided between each such exit door and each such downstream treatment facility.
2. A rotary hearth furnace according to claim 1, characterized in that a different treatment facility (13, 17, 18, 20) such as a quench bath at a specific temperature or a quenching press is connected with each such exit door (A1, A2, A3).
3. A rotary hearth furnace according to any of claims 1 or 2, characterized in that each such exit door (A1, A2, A3) and the associated downstream treatment facility (13, 17, 18, 20) are interconnected by a vestibule (S2, S3, S4).
EP83102289A 1982-03-13 1983-03-09 Rotary hearth furnace Expired EP0088995B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83102289T ATE21167T1 (en) 1982-03-13 1983-03-09 ROTARY FURNACE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823209245 DE3209245A1 (en) 1982-03-13 1982-03-13 TURNING OVENS
DE3209245 1982-03-13

Publications (2)

Publication Number Publication Date
EP0088995A1 EP0088995A1 (en) 1983-09-21
EP0088995B1 true EP0088995B1 (en) 1986-07-30

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ID=6158206

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EP83102289A Expired EP0088995B1 (en) 1982-03-13 1983-03-09 Rotary hearth furnace

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AT (1) ATE21167T1 (en)
DE (1) DE3209245A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3435376C2 (en) * 1984-09-27 1996-09-12 Loi Ipsen Holding Gmbh Process for heat treatment of workpieces
US4763880A (en) * 1987-04-03 1988-08-16 Holcroft/Loftus Inc. Rotary hearth multi-chamber, multi-purpose furnace system
DE4316841A1 (en) * 1993-05-19 1994-11-24 Aichelin Gmbh Device for the heat treatment of metallic workpieces
DE29505496U1 (en) * 1995-03-31 1995-06-01 Ipsen Ind Int Gmbh Device for the heat treatment of metallic workpieces under vacuum
DE19514289B4 (en) * 1995-04-24 2006-09-21 Loi Thermprocess Gmbh Furnace plant for heat treatment of workpieces
DE10310739A1 (en) * 2002-03-27 2003-10-09 Loi Thermprocess Gmbh Device for heat treating workpieces has an opening for charging/discharging in the outer wall of a rotary furnace in a last treatment zone
ATE504792T1 (en) * 2003-11-19 2011-04-15 Loi Thermprocess Gmbh SYSTEM AND METHOD FOR HEAT TREATING VARIOUS WORKPIECES
DE102012019653A1 (en) * 2012-10-08 2014-04-10 Ipsen International Gmbh Gas-tight protective gas-blast industrial furnace, in particular chamber furnace, pusher furnace, rotary hearth furnace or ring hearth furnace

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1013380A (en) * 1950-03-01 1952-07-28 Rotary circular furnace for heating metal in ingots, billets, etc.
FR1483242A (en) * 1966-06-13 1967-06-02 Toyo Kogyo Company Ltd Heat treatment furnace
FR1560499A (en) * 1967-02-15 1969-03-21

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ATE21167T1 (en) 1986-08-15
EP0088995A1 (en) 1983-09-21
DE3209245C2 (en) 1988-01-28
DE3209245A1 (en) 1983-09-15

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