EP1153146B1 - Continuous furnace comprising a device for quenching workpieces and quenching method - Google Patents

Continuous furnace comprising a device for quenching workpieces and quenching method Download PDF

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Publication number
EP1153146B1
EP1153146B1 EP00909114A EP00909114A EP1153146B1 EP 1153146 B1 EP1153146 B1 EP 1153146B1 EP 00909114 A EP00909114 A EP 00909114A EP 00909114 A EP00909114 A EP 00909114A EP 1153146 B1 EP1153146 B1 EP 1153146B1
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EP
European Patent Office
Prior art keywords
lock
quenching
workpieces
quenching chamber
continuous furnace
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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 - Lifetime
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EP00909114A
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German (de)
French (fr)
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EP1153146A1 (en
Inventor
Friedhelm Kuehn
Wolfgang Schalberger
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LOI Thermprocess GmbH
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LOI Thermprocess GmbH
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Priority claimed from DE19919738A external-priority patent/DE19919738A1/en
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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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • 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
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
    • 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
    • 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 continuous furnace with a device for quenching of workpieces, the device being connected to a lock Removal of the workpieces.
  • the invention further relates to a method for quenching workpieces.
  • the continuous furnace can be designed as a pusher furnace, roller hearth furnace or rotary hearth furnace his.
  • the workpieces are in transit through the Batch oven, on grates or the like. in the oven the workpieces are exposed to a reaction gas, here endogas.
  • FR-A-2617953 describes a continuous furnace with a device for quenching Workpieces, the device being connected to a lock for removing the workpieces connects, a quench chamber connects vertically to the lock and the lock is provided with a transport device that the workpieces between the lock and quenching chamber transported.
  • the workpieces can be quenched with a cooling gas.
  • the object of the invention is to provide a continuous furnace with a device for Quenching and developing a method of quenching such that an energy-saving and environmentally friendly quenching of workpieces is made possible.
  • the workpieces are quenched without the problems mentioned at the beginning have to put up with the use of liquid quenching agents. Above all, there is no need to clean the workpieces from adhering oil or salt or water additives, which causes environmental problems.
  • Quenching with cooling gas has the advantage that the delay of the quenched Workpieces are small and also uniform.
  • the quenching chamber has only one Has opening for loading and unloading.
  • the quenching chamber is preferably arranged above the lock. This enables an essential further development of the invention, which consists in that the transport device with at least one spindle or the like Device is moved vertically and that the transport device such is designed so that the opening between the lock and quenching chamber locked during quenching.
  • a transport floor for the horizontal transport of the workpieces the lock is provided with the quenching chamber closed. This training Allows an operator to quench the workpiece during quenching Unloading the continuous furnace is possible.
  • the transport floor is preferably at a fixed distance from the transport device arranged.
  • the quenching chamber is designed to be pressure-tight and with at least a circulation fan.
  • the solution to the problem is that Workpieces in the lock essentially vertically into a quenching chamber are transported in which the workpieces are under increased pressure from below 10 bar can be quenched by means of recirculated cooling gas and that after expiration during the quenching period, the workpieces are transported into and out of the lock this can be removed.
  • Hydrogen is preferably used as the cooling gas.
  • the cooling gas advantageously turns into Flushed gas storage.
  • the rotary hearth furnace system shown in FIGS. 1 and 2 is used for hardening Workpieces 1, here gear parts used.
  • the gear parts 1 are on Batch carriers 2 (see FIG. 2), here stacked on grates.
  • the furnace system points a rotary hearth furnace 3 in ring channel design, in which the workpieces 1 under a reaction gas, here endogas are heat treated.
  • an insulated oven door 4 is provided for loading and unloading.
  • a lock 5 adjoins the furnace door 4 in a gas-tight manner which, as shown in FIG. 2, has an exit door 6.
  • a quenching chamber 7 which as a pressure chamber a water-cooled outer jacket.
  • the lock is with one Transport device 8 provided.
  • the transport device 8 in the lock 5 can in elevator mode by means of several spindles 9 or similar devices be moved vertically under the quenching chamber 7.
  • the transport device is designed so that this pressure-tight an opening 12 between Lock 5 and quench chamber 7, for example via so-called finger pins, not shown.
  • the quenching chamber 7 is connected to a pump station 13 and a gas intermediate store 14 connected for a cooling gas.
  • a gas intermediate store 14 connected for a cooling gas.
  • a heat exchanger 15 shown in FIG. 2 cools the cooling gas, while it is being circulated.
  • the transport floor at a fixed distance from it 16 arranged, the one when the quenching chamber 7 is closed Transport of the workpieces on the batch carriers under the quenching chamber allows.
  • the spindles 9 or similar drives of the transport device 8 arranged in four places laterally in the lock space 5, so that the Lock can be passed by a batch carrier.
  • the spindles 9 are equipped with a radiation shield, not shown, as heat protection.
  • the furnace door 4 of the rotary hearth furnace 3 opened and a batch carrier 2, for. B. a rust of a known cross pusher on the transport device of the lock encountered.
  • the transport device 8 is at the same level as that Stove of the rotary hearth furnace. As soon as the cross bumper has passed through the oven door, except for a residual dimension that allows the cross bumper to return, be lowered. After the cross pusher has left the lock the transport device 8 moved vertically under the quenching chamber 7. The transport device 8 closes the quenching chamber 7 in a gas-tight manner.
  • the closed cold quenching chamber will by means of the pump station 13 with a cooling gas, preferably hydrogen or Nitrogen, flooded and the workpieces at a pressure of less than 10 bar, preferably 9.5 bar, quenched by recirculating cooling gas.
  • the hydrogen becomes exhausted the cooling time for pressure equalization at the furnace pressure in the gas buffer 14 flooded and cached.
  • the cooling gas can be stored to use it multiple times as a cooling gas to finally use it To use incineration.
  • the cooling gas could also be used for manufacturing be used by Endogas for the continuous furnace or from the gas buffer be removed for heating purposes.
  • the quenching chamber 7 flushed with the reaction gas, here endogas.
  • the transport device 8 lowered and the workpieces 1 from the quenching chamber 7 transported into the lock 5.
  • the transport floor is located itself in the position shown in dashed lines in FIG. 2.
  • the exit door 6 of the Lock 5 is in a known manner with a burning gas curtain Mistake. It can be opened so early that the Transport device 8 arrives in the extension level when the exit door 6 has reached its open position.
  • a Drive the known grate extractor (not shown) onto the transport device 8 and pull the grate 2 out of the lock.
  • the workpieces 1 are over an unloading storage path 17 fed to a tempering furnace, not shown which can be followed by a cooling section.
  • the exit door 6 becomes the Lock locked and the lock 5 flushed with endogas.
  • the gas can be flushed into the intermediate gas storage 14.
  • the purging process uses a Flush, not shown, rinsed out.
  • the workpieces quenched with cooling gas under pressure have only a small number Delays on, which are also uniform.
  • the workpieces are washed unnecessary.
  • the flushing volume is low due to the elevator principle.
  • the quenching chamber can also be located below the lock become.

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  • 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)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

The invention relates to a continuous furnace comprising a device for quenching workpieces. The device adjoins a lock for the removal of the workpieces. A quenching chamber (7) adjoins the lock (5) vertically and is connected to a pump station (13) for a cooling gas. An opening (12) which can be closed so that it is gastight is located between the lock (5) and the quenching chamber (7). The lock (5) is provided with a conveying device (8) which conveys the workpieces (1) between the lock (5) and the quenching chamber (7). The invention provides an energy-saving and environmentally sound means of quenching workpieces and at the same time avoids the disadvantages of the quenching in liquid quenching means.

Description

Die Erfindung betrifft einen Durchlaufofen mit einer Einrichtung zum Abschrecken von Werkstücken, wobei sich die Einrichtung an eine Schleuse zur Entnahme der Werkstücke anschließt. Ferner betrifft die Erfindung ein Verfahren zum Abschrecken von Werkstücken.The invention relates to a continuous furnace with a device for quenching of workpieces, the device being connected to a lock Removal of the workpieces. The invention further relates to a method for quenching workpieces.

Der Durchlaufofen kann als Stoßofen, Rollenherdofen oder Drehherdofen ausgebildet sein. Die Werkstücke befinden sich während des Transports durch den Ofen auf Chargenträgern, und zwar auf Rosten oder ähnlichem. in dem Ofen sind die Werkstücke einem Reaktionsgas, hier Endogas, ausgesetzt.The continuous furnace can be designed as a pusher furnace, roller hearth furnace or rotary hearth furnace his. The workpieces are in transit through the Batch oven, on grates or the like. in the oven the workpieces are exposed to a reaction gas, here endogas.

Aus der Praxis ist bekannt, die Werkstücke nach dem Aufkohlen oder Carbonitrieren im Durchlaufofen in Wasser-, Öl- oder Salzbädem, die sich an den Ofen anschließen, abzuschrecken. Die Verwendung von flüssigen Abschreckmitteln ist problematisch, weil nach dem Abschrecken Reste von Öl-, Salz- oder Wasserzusätzen von den Werkstücken entfernt und entsorgt werden müssen. Dies kann Umweltprobleme zur Folge haben. Außerdem ist die Verwendung von Öl und Salz als Abschreckmittel sicherheitstechnisch problematisch. Des weiteren ist die Bandbreite der Vorzüge der Werkstücke, je nach Werkstückgeometrie, beim Abschrecken in flüssigen Abschreckmitteln sehr hoch.It is known from practice that the workpieces after carburizing or carbonitriding in a continuous furnace in water, oil or salt baths that adhere to the furnace connect to deter. The use of liquid quenchants is problematic because after quenching residues of oil, salt or water additives must be removed from the workpieces and disposed of. This can cause environmental problems. It also uses oil and salt as a deterrent is problematic in terms of safety. Furthermore is the range of advantages of the workpieces, depending on the workpiece geometry, very high when quenched in liquid quenching agents.

FR-A-2617953 beschreibt einen Durchlaufofen mit einer Einrichtung zum Abschrecken von Werkstücken, wobei sich die Einrichtung an eine Schleuse zur Entnahme der Werkstücke anschließt, sich vertikal an die Schleuse eine Abschreckkammer anschließt und die Schleuse mit einer Transportvorrichtung versehen ist, die die Werkstücke zwischen Schleuse und Abschreckkammer transportiert. Die Werkstücke können mit einem Kühlgas abgeschreckt werden.FR-A-2617953 describes a continuous furnace with a device for quenching Workpieces, the device being connected to a lock for removing the workpieces connects, a quench chamber connects vertically to the lock and the lock is provided with a transport device that the workpieces between the lock and quenching chamber transported. The workpieces can be quenched with a cooling gas.

Aufgabe der Erfindung ist es, einen Durchlaufofen mit einer Einrichtung zum Abschrecken und ein Verfahren zum Abschrecken so weiterzuentwickeln, daß ein energiesparendes und umweltschonendes Abschrecken von Werkstücken ermöglicht wird.The object of the invention is to provide a continuous furnace with a device for Quenching and developing a method of quenching such that an energy-saving and environmentally friendly quenching of workpieces is made possible.

Diese Aufgabe wird erfindungsgemäß durch die in den Ansprüchen 1 und 7 aufgeführten kennzeichnenden Merkmale gelöst.This object is achieved by those listed in claims 1 and 7 characteristic features solved.

Die Werkstücke werden abgeschreckt, ohne die eingangs genannten Probleme bei der Verwendung von flüssigen Abschreckmitteln in Kauf nehmen zu müssen. Vor allem entfällt das Reinigen der Werkstücke von anhaftendem Öl, Salz oder Wasserzusätzen, was Umweltprobleme zur Folge hat.The workpieces are quenched without the problems mentioned at the beginning have to put up with the use of liquid quenching agents. Above all, there is no need to clean the workpieces from adhering oil or salt or water additives, which causes environmental problems.

Das Abschrecken mit Kühlgas hat den Vorteil, daß die Verzüge der abgeschreckten Werkstücke gering und zudem einheitlich sind.Quenching with cooling gas has the advantage that the delay of the quenched Workpieces are small and also uniform.

Es ist herstellungstechnisch vorteilhaft, daß die Abschreckkammer nur eine Öffnung zum Be- und Entladen aufweist.It is technically advantageous that the quenching chamber has only one Has opening for loading and unloading.

Vorzugsweise ist die Abschreckkammer oberhalb der Schleuse angeordnet. Dies ermöglicht eine wesentliche Weiterbildung der Erfindung, die darin besteht, daß die Transportvorrichtung mit mindestens einer Spindel oder ähnlichen Einrichtung vertikal bewegt wird und daß die Transportvorrichtung derart ausgebildet ist, daß diese die Öffnung zwischen Schleuse und Abschreckkammer während des Abschreckens verschließt.The quenching chamber is preferably arranged above the lock. This enables an essential further development of the invention, which consists in that the transport device with at least one spindle or the like Device is moved vertically and that the transport device such is designed so that the opening between the lock and quenching chamber locked during quenching.

Nach einem weiteren Merkmal der Erfindung ist unterhalb der Transportvorrichtung ein Transportboden zum horizontalen Transport der Werkstücke durch die Schleuse bei geschlossener Abschreckkammer vorgesehen. Diese Weiterbildung ermöglicht, daß während des Abschreckens der Werkstücke ein Beoder Entladen des Durchlaufofens möglich ist.According to a further feature of the invention is below the transport device a transport floor for the horizontal transport of the workpieces the lock is provided with the quenching chamber closed. This training Allows an operator to quench the workpiece during quenching Unloading the continuous furnace is possible.

Vorzugsweise ist der Transportboden in einem festen Abstand zur Transportvorrichtung angeordnet.The transport floor is preferably at a fixed distance from the transport device arranged.

Erfindungsgemäß ist die Abschreckkammer druckdicht ausgeführt und mit mindestens einem Umwälzventilator versehen.According to the quenching chamber is designed to be pressure-tight and with at least a circulation fan.

Verfahrenstechnisch besteht die Lösung der gestellten Aufgabe darin, daß die Werkstücke in der Schleuse im wesentlichen vertikal in eine Abschreckkammer transportiert werden, in der die Werkstücke unter erhöhtem Druck von unter 10 bar mittels rezirkuliertem Kühlgas abgeschreckt werden und daß nach Ablauf der Abschreckzeit die Werkstücke in die Schleuse transportiert und aus dieser entnommen werden. Technically, the solution to the problem is that Workpieces in the lock essentially vertically into a quenching chamber are transported in which the workpieces are under increased pressure from below 10 bar can be quenched by means of recirculated cooling gas and that after expiration during the quenching period, the workpieces are transported into and out of the lock this can be removed.

Vorzugsweise wird als Kühlgas Wasserstoff verwendet.Hydrogen is preferably used as the cooling gas.

Vorteilhafterweise wird nach Beendigung der Abschreckzeit das Kühlgas in ein Gaszwischenspeicher geflutet.After the quenching time has ended, the cooling gas advantageously turns into Flushed gas storage.

Erfindungsgemäß besteht dann die Möglichkeit, das Kühlgas aus dem Gaszwischenspeicher zu Beheizungszwecken oder zur Herstellung von Reaktionsgas zu verwenden.According to the invention, there is then the possibility of the cooling gas from the gas intermediate store for heating purposes or for the production of reaction gas to use.

Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispiels im Zusammenhang mit der Zeichnung näher erläutert.The invention is described below on the basis of a preferred exemplary embodiment explained in connection with the drawing.

Die Zeichnung zeigt in:

Fig. 1:
eine Draufsicht auf eine Drehherdofen-Anlage in Ringkanalbauweise;
Fig. 2:
einen seitlichen Teil-Schnitt durch den Drehherdofen mit der Einrichtung zum Abschrecken.
The drawing shows in:
Fig. 1:
a plan view of a rotary hearth furnace system in a ring channel design;
Fig. 2:
a partial partial section through the rotary hearth furnace with the device for quenching.

Die in Fig. 1 und 2 dargestellte Drehherdofen-Anlage wird zum Härten von Werkstücken 1, hier Getriebeteilen verwendet. Die Getriebeteile 1 sind auf Chargenträgern 2 (s. Fig. 2), hier auf Rosten gestapelt. Die Ofenanlage weist einen Drehherdofen 3 in Ringkanalbauweise auf, in dem die Werkstücke 1 unter einem Reaktionsgas, hier Endogas wärmebehandelt werden. An einer Stelle ist eine isolierte Ofentür 4 zum Be- und Entladen vorgesehen.The rotary hearth furnace system shown in FIGS. 1 and 2 is used for hardening Workpieces 1, here gear parts used. The gear parts 1 are on Batch carriers 2 (see FIG. 2), here stacked on grates. The furnace system points a rotary hearth furnace 3 in ring channel design, in which the workpieces 1 under a reaction gas, here endogas are heat treated. At one point an insulated oven door 4 is provided for loading and unloading.

An den Drehherdofen 3 schließt sich an die Ofentür 4 gasdicht eine Schleuse 5 an, die wie in Fig. 2 dargestellt, eine Ausgangstür 6 aufweist. Oberhalb der Schleuse 5 befindet sich eine Abschreckkammer 7, die als Druckkammer mit einem wassergekühlten Außenmantel ausgeführt ist. Die Schleuse ist mit einer Transportvorrichtung 8 versehen. Die Transportvorrichtung 8 in der Schleuse 5 kann in Elevator-Fahrweise mittels mehrerer Spindeln 9 oder ähnlicher Einrichtungen vertikal unter die Abschreckkkammer 7 gefahren werden. Die Transportvorrichtung ist so ausgebildet, daß diese druckdicht eine Öffnung 12 zwischen Schleuse 5 und Abschreckkammer 7 verschließen kann, beispielsweise über sogenannte nicht dargestellte Fingerpins.At the rotary hearth furnace 3, a lock 5 adjoins the furnace door 4 in a gas-tight manner which, as shown in FIG. 2, has an exit door 6. Above the Lock 5 is a quenching chamber 7, which as a pressure chamber a water-cooled outer jacket. The lock is with one Transport device 8 provided. The transport device 8 in the lock 5 can in elevator mode by means of several spindles 9 or similar devices be moved vertically under the quenching chamber 7. The transport device is designed so that this pressure-tight an opening 12 between Lock 5 and quench chamber 7, for example via so-called finger pins, not shown.

Die Abschreckkammer 7 ist an eine Pumpstation 13 und einen Gaszwischenspeicher 14 für ein Kühlgas angeschlossen. In der Abschreckkammer befinden sich mehrere Umwälzventilatoren 10, deren Achsen senkrecht oder parallel zur Achse der Abschreckkammer 7 angeordnet sind und die von Motoren 11 angetrieben werden. Ein in Fig. 2 dargestellter Wärmetauscher 15 kühlt das Kühlgas, während es umgewälzt wird.The quenching chamber 7 is connected to a pump station 13 and a gas intermediate store 14 connected for a cooling gas. Are in the quenching chamber several circulation fans 10, the axes of which are perpendicular or parallel to Axis of the quench chamber 7 are arranged and driven by motors 11 become. A heat exchanger 15 shown in FIG. 2 cools the cooling gas, while it is being circulated.

Unterhalb der Transportvorrichtung 8 ist in festem Abstand zu dieser ein Transportboden 16 angeordnet, der bei geschlossener Abschreckkammer 7 einen Transport der Werkstücke auf den Chargenträgern unter der Abschreckkammer ermöglicht. Hierfür sind die Spindeln 9 oder ähnliche Antriebe der Transportvorrichtung 8 an vier Stellen seitlich im Schleusenraum 5 angeordnet, so daß die Schleuse von einem Chargenträger passiert werden kann. Die Spindeln 9 sind mit einem nicht dargestellten Strahlungsschutzschirm als Wärmeschutz ausgerüstet.Below the transport device 8 is a transport floor at a fixed distance from it 16 arranged, the one when the quenching chamber 7 is closed Transport of the workpieces on the batch carriers under the quenching chamber allows. For this purpose, the spindles 9 or similar drives of the transport device 8 arranged in four places laterally in the lock space 5, so that the Lock can be passed by a batch carrier. The spindles 9 are equipped with a radiation shield, not shown, as heat protection.

Im folgenden wird das erfindungsgemäße Verfahren zum Abschrecken erläutert:The quenching method according to the invention is explained below:

Nach Abschluß der Wärmebehandlung in dem Drehherdofen 3 wird die Ofentür 4 des Drehherdofens 3 geöffnet und ein Chargenträger 2, z. B. ein Rost von einem an sich bekannten Querstoßer auf die Transportvorrichtung der Schleuse gestoßen. Die Transportvorrichtung 8 befindet sich auf gleichem Niveau wie der Herd des Drehherdofens. Sobald der Querstoßer die Ofentür durchfahren hat, kann diese bis auf ein Restmaß, das die Rückfahrt des Querstoßers zuläßt, abgesenkt werden. Nachdem der Querstoßer die Schleuse verlassen hat, wird die Transportvorrichtung 8 vertikal unter die Abschreckkammer 7 gefahren. Dabei verschließt die Transportvorrichtung 8 die Abschreckkammer 7 gasdicht. Während des Transportes der Werkstücke befindet sich in der Abschreckkammer, ebenso wie in der Schleuse, das im Durchlaufofen eingesetzte Reaktionsgas. Die geschlossene kalte Abschreckkammer wird mittels der Pumpstation 13 mit einem Kühlgas, vorzugsweise Wasserstoff oder Stickstoff, geflutet und die Werkstücke bei einem Druck von unter 10 bar, vorzugsweise 9,5 bar, mittels rezirkulierendem Kühlgas abgeschreckt.After completion of the heat treatment in the rotary hearth furnace 3, the furnace door 4 of the rotary hearth furnace 3 opened and a batch carrier 2, for. B. a rust of a known cross pusher on the transport device of the lock encountered. The transport device 8 is at the same level as that Stove of the rotary hearth furnace. As soon as the cross bumper has passed through the oven door, except for a residual dimension that allows the cross bumper to return, be lowered. After the cross pusher has left the lock the transport device 8 moved vertically under the quenching chamber 7. The transport device 8 closes the quenching chamber 7 in a gas-tight manner. During the transport of the work pieces is in the Quenching chamber, just like in the lock, that in the continuous furnace Reaction gas used. The closed cold quenching chamber will by means of the pump station 13 with a cooling gas, preferably hydrogen or Nitrogen, flooded and the workpieces at a pressure of less than 10 bar, preferably 9.5 bar, quenched by recirculating cooling gas.

Wenn als Kühlgas Wasserstoff verwendet wird, wird der Wasserstoff nach Ablauf der Kühlzeit beim Druckausgleich auf Ofendruck in den Gaszwischenspeicher 14 geflutet und zwischengespeichert. Das Kühlgas kann gespeichert werden, um es mehrfach als Kühlgas zu verwenden, um es abschließend zu Verbrennungszwecken zu nutzen. Das Kühlgas könnte auch zur Herstellung von Endogas für den Durchlaufofen benutzt werden oder aus dem Gaszwischenspeicher zu Beheizungszwecken entnommen werden.If hydrogen is used as the cooling gas, the hydrogen becomes exhausted the cooling time for pressure equalization at the furnace pressure in the gas buffer 14 flooded and cached. The cooling gas can be stored to use it multiple times as a cooling gas to finally use it To use incineration. The cooling gas could also be used for manufacturing be used by Endogas for the continuous furnace or from the gas buffer be removed for heating purposes.

Nach dem Druckausgleich auf Ofendruck, und zwar um 3 mbar, wird die Abschreckkammer 7 mit dem Reaktionsgas, hier Endogas, gespült. Danach wird die Transportvorrichtung 8 abgesenkt und dabei die Werkstücke 1 aus der Abschreckkammer 7 in die Schleuse 5 transportiert. Der Transportboden befindet sich in der in Fig. 2 gestrichelt dargestellten Position. Die Ausgangstür 6 der Schleuse 5 ist in an sich bekannter Art und Weise mit einem brennenden Gasschleier versehen. Sie kann so frühzeitig geöffnet werden, daß zeitgleich die Transportvorrichtung 8 in der Ausfahrebene ankommt, wenn die Ausgangstür 6 ihre geöffnete Stellung erreicht hat. Zu diesem Zeitpunkt kann außerdem ein nicht dargestellter bekannter Rostauszieher auf die Transportvorrichtung 8 fahren und den Rost 2 aus der Schleuse ziehen. Die Werkstücke 1 werden über eine Entladespeicherbahn 17 einem nicht dargestellten Anlaßofen zugeführt, an den sich eine Kühlstrecke anschließen kann.After pressure equalization at furnace pressure, namely by 3 mbar, the quenching chamber 7 flushed with the reaction gas, here endogas. After that the transport device 8 lowered and the workpieces 1 from the quenching chamber 7 transported into the lock 5. The transport floor is located itself in the position shown in dashed lines in FIG. 2. The exit door 6 of the Lock 5 is in a known manner with a burning gas curtain Mistake. It can be opened so early that the Transport device 8 arrives in the extension level when the exit door 6 has reached its open position. At this point, a Drive the known grate extractor (not shown) onto the transport device 8 and pull the grate 2 out of the lock. The workpieces 1 are over an unloading storage path 17 fed to a tempering furnace, not shown which can be followed by a cooling section.

Nach Ausfahrt des Rostes 2 aus der Schleuse 5 wird die Ausgangstür 6 der Schleuse verschlossen und die Schleuse 5 mit Endogas gespült. Das Gas kann in den Gaszwischenspeicher 14 gespült werden.After the grate 2 exits the lock 5, the exit door 6 becomes the Lock locked and the lock 5 flushed with endogas. The gas can be flushed into the intermediate gas storage 14.

Wird Stickstoff als Kühlmedium eingesetzt, wird beim Spülvorgang über eine nicht dargestellte Fackel ausgespült.If nitrogen is used as the cooling medium, the purging process uses a Flush, not shown, rinsed out.

Die mit Kühlgas unter Druck abgeschreckten Werkstücke weisen nur geringe Verzüge auf, die zudem einheitlich sind. Ein Nachwaschen der Werkstücke ist nicht notwendig. Bedingt durch das Elevator-Prinzip ist das Spülvolumen gering. Bei geöffneter Schleusenausgangstür befindet sich nur das bisher im Ofen eingesetzte Reaktionsgas in der Schleuse.The workpieces quenched with cooling gas under pressure have only a small number Delays on, which are also uniform. The workpieces are washed unnecessary. The flushing volume is low due to the elevator principle. When the lock exit door is open, only the one that was previously in the oven Reaction gas used in the lock.

Besonders vorteilhaft ist, daß ein Entladen und Belanden des Durchlaufofens bei geschlossener Abschreckkammer möglich ist.It is particularly advantageous that unloading and loading the continuous furnace is possible with the quenching chamber closed.

Im Rahmen der Erfindung sind ohne weiteres Abwandlungsmöglichkeiten gegeben. So kann die Abschreckkammer auch unterhalb der Schleuse angeordnet werden.Within the scope of the invention, modification options are readily available. The quenching chamber can also be located below the lock become.

Claims (10)

  1. Continuous furnace with a device for quenching workpieces, said device adjoining a lock (5) to remove said workpieces which is vertically adjoined by a quenching chamber (7) which is connected to a pump station (13) for a cooling gas, wherein the lock is provided with a transport device (8) which transports the workpieces (1) between the lock (5) and the quenching chamber (7),
    characterised in that an opening (12) which can be sealed gas-tight is located between the lock (5) and the quenching chamber (7) and that the transport device (8) is designed so that it seals the opening (12) between the lock (5) and the quenching chamber (7).
  2. Continuous furnace according to claim 1,
    characterised in that the quenching chamber (7) is arranged above the lock (5).
  3. Continuous furnace according to claim 1 or 2,
    characterised in that the transport device (8) is moved vertically with at least one spindle (9) or similar device.
  4. Continuous furnace according to any one of claims 1 through 3,
    characterised in that, below the transport device (8), a transport floor (16) is provided for the horizontal transport of the workpieces (1) through the lock (5) when the quenching chamber (7) is closed.
  5. Continuous furnace according to claim 4,
    characterised in that the transport floor (16) is arranged at a fixed distance to the transport device (8).
  6. Continuous furnace according to either of claims 1 or 5,
    characterised in that the quenching chamber (7) is pressure-tight and provided with at least one circulating fan (10).
  7. A method for quenching workpieces which are heat-treated in a continuous furnace under a reaction gas and which are transferred from the continuous furnace into a lock to which a quenching chamber for quenching the work pieces under a gas adjoins, the workpieces in the lock (5) being transported substantially vertically into a cold quenching chamber (7) by means of a transport device (8),
    characterised in that,
    during the transportation of the workpieces from the lock (5) into the quenching chamber (7) by means of the transport device (8), the quenching chamber (7) is sealed, that the sealed quenching chamber is flooded with cooling gas and that the workpieces are quenched at elevated pressure of less than 10 bar by means of recirculated cooling gas, the quenching chamber (7) being, after completion of the quenching time, rinsed with the reaction gas used in the continuous furnace and that the workpieces are transported into the lock (5) and removed therefrom.
  8. Method according to claim 7,
    characterised in that hydrogen is used as the cooling gas.
  9. Method according to claim 8,
    characterised in that, after completion of the quenching time, the cooling gas is flooded into a gas intermediate storage facility (14).
  10. Method according to claim 7 or 8,
    characterised in that the cooling gas from the gas intermediate storage facility (14) is used for heating purposes or for producing the reaction gas.
EP00909114A 1999-01-29 2000-01-28 Continuous furnace comprising a device for quenching workpieces and quenching method Expired - Lifetime EP1153146B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19903659 1999-01-29
DE19903659 1999-01-29
DE19919738 1999-04-30
DE19919738A DE19919738A1 (en) 1999-01-29 1999-04-30 Continuous furnace with a device for quenching workpieces and quenching processes
PCT/EP2000/000654 WO2000044945A1 (en) 1999-01-29 2000-01-28 Continuous furnace comprising a device for quenching workpieces and quenching method

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EP1153146A1 EP1153146A1 (en) 2001-11-14
EP1153146B1 true EP1153146B1 (en) 2002-08-07

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EP (1) EP1153146B1 (en)
AT (1) ATE221923T1 (en)
WO (1) WO2000044945A1 (en)

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Publication number Priority date Publication date Assignee Title
CN107058687B (en) * 2017-04-10 2018-09-14 遵义顺峰汽车零部件制造有限公司 Heat-treatment part cooling device
CN112458250A (en) * 2020-11-07 2021-03-09 常德市金晟科技有限公司 Quenching equipment for machining convenient to use
CN113430340A (en) * 2021-06-07 2021-09-24 合肥科晶材料技术有限公司 System capable of realizing material quenching experiment in air

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1181169A (en) * 1967-11-10 1970-02-11 Ass Elect Ind Improvements relating to Furnaces
FR2617953B2 (en) * 1982-04-27 1989-11-03 Innovatique Sa ROTATING SOLE FOR THERMAL, THERMOCHEMICAL OR ELECTROTHERMAL TREATMENT OF METALS UNDER RAREFIED OR CONTROLLED ATMOSPHERE
DE3819803C1 (en) * 1988-06-10 1989-12-14 Ulrich 5810 Witten De Wingens
DE3831910C2 (en) * 1988-09-20 1995-08-24 Schmetz Gmbh Pull-through furnace for long products
JP3640687B2 (en) * 1994-09-05 2005-04-20 Ｎｔｎ株式会社 Method and apparatus for quenching flattened parts
DE29717714U1 (en) * 1997-10-07 1997-11-13 Ipsen Ind Int Gmbh Device for quenching batches of metallic workpieces with a fluid, in particular gaseous medium at a predetermined quenching pressure

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WO2000044945A1 (en) 2000-08-03
EP1153146A1 (en) 2001-11-14
ATE221923T1 (en) 2002-08-15

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