EP1531186B1 - Apparatus and method for heat treatment of metallic work pieces - Google Patents
Apparatus and method for heat treatment of metallic work pieces Download PDFInfo
- Publication number
- EP1531186B1 EP1531186B1 EP03026214A EP03026214A EP1531186B1 EP 1531186 B1 EP1531186 B1 EP 1531186B1 EP 03026214 A EP03026214 A EP 03026214A EP 03026214 A EP03026214 A EP 03026214A EP 1531186 B1 EP1531186 B1 EP 1531186B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- furnace
- gas
- heat treatment
- work pieces
- 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 - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 title claims description 50
- 238000000034 method Methods 0.000 title claims description 27
- 238000010791 quenching Methods 0.000 claims abstract description 33
- 230000000171 quenching effect Effects 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract 2
- 239000007789 gas Substances 0.000 claims description 39
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 230000001681 protective effect Effects 0.000 claims description 20
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract 1
- 239000011261 inert gas Substances 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 239000003570 air Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003958 fumigation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- 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
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/0016—Chamber type furnaces
- F27B17/0083—Chamber type furnaces with means for circulating the atmosphere
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/04—Circulating atmospheres by mechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D2003/0085—Movement of the container or support of the charge in the furnace or in the charging facilities
- F27D2003/0091—Horizontally
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/12—Travelling or movable supports or containers for the charge
- F27D2003/124—Sleds; Transport supports
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/04—Circulating atmospheres by mechanical means
- F27D2007/045—Fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
- F27D2007/063—Special atmospheres, e.g. high pressure atmospheres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0012—Monitoring the composition of the atmosphere or of one of their components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0073—Seals
- F27D2099/0078—Means to minimize the leakage of the furnace atmosphere during charging or discharging
- F27D2099/008—Using an air-lock
Definitions
- the invention relates to a device in the form of an atmosphere furnace for heat treatment of metallic workpieces at high temperatures.
- the invention also relates to a method for heat treatment of metallic workpieces in such a furnace.
- Furnaces of the aforementioned type have hitherto been used in vertical construction as so-called shaft furnaces.
- a disadvantage of a shaft furnace is that after a heat treatment of the metallic workpieces they must be lifted by means of a lifting tool from the shaft furnace and implemented in a side of the shaft furnace quenching.
- This Umsetzvorganges occurs due to the contact of the heat-treated workpieces with the ambient air disadvantageously to an oxidation of the heat-treated workpieces, with the result of a Randentkohlung and a concomitant loss of quality.
- the bell-shaped hood ovens are arranged movably on rails and can be moved back and forth above appropriately designed quench baths. After a heat treatment of the workpieces in the oven, these can be moved together with the bell oven via a corresponding Abschreckbad, so that in contrast to the above-described multi-chamber oven a flexible deterrent is possible.
- the quenching takes place by the closest possible approach of the bell-hole opening to the upper opening of the quench bath, wherein to avoid unwanted oxidation of the heat-treated workpieces, the resulting narrow intermediate gap between quench bath on the one hand and bell oven opening on the other hand is purged with nitrogen.
- a completely gas-tight coupling to the Abschreckbad is not possible, so that a completely oxide-free heat treatment can not be achieved even when using a bell furnace system.
- a heat treatment system which has a plurality of treatment chambers and a transport chamber arranged for this purpose relatively movable.
- the transport chamber is used to implement workpieces and to transport from treatment chamber to treatment chamber.
- the US-A-5,624,255 proposed to drive both the treatment chambers and the transport chamber with overpressure, so that the atmosphere surrounding the treatment chamber or the transport chamber can not get into the gap between the processing chamber and the transport chamber coupled thereto.
- a device for transporting metallic workpieces is further from the US-2002/0146659 A1 known.
- the transport device described here consists of a transport chamber on the one hand and a carrying the transport chamber chassis on the other.
- the transport chamber has a loading and unloading opening, which can be closed by means of a door.
- the coupling of the transport chamber to a processing chamber takes place with the interposition of a preferably separately formed lock. This lock is intended to protect the workpieces from environmental influences when workpieces are transported between the treatment chamber on the one hand and the transport chamber on the other hand.
- a horizontal atmosphere furnace for heat treatment of metallic workpieces at high temperatures with a cylindrically shaped furnace chamber, wherein the furnace chamber in the Ofenschdung formed gas inlets and / or flaring, and the furnace chamber gas-tight closing furnace door, wherein the furnace door within a a gas-tight lockable lock-forming door latch is movably arranged, wherein the door box means for a gas-tight connection to a corresponding having trained counter module and wherein the door box has a gas discharge point.
- High temperatures in the context of the invention are temperatures of over 400 ° C up to 1050 ° C.
- the oven according to the invention is characterized in particular by its gas-tight final oven door on the one hand and the door box forming the lock on the other. Due to these components, the horizontally formed atmospheric furnace can be coupled gas-tight to, for example, designed as transport modules counter modules. Upon completion of the atmosphere surrounding the furnace, the workpieces subjected to a heat treatment can be removed from the furnace and transferred to the counter module. Since a complete seal between the furnace on the one hand and counter module on the other hand can be ensured by means of the door box, an unwanted oxidation of the heat-treated workpieces is safe to exclude.
- the construction according to the invention makes it possible to gas-tightly connect the oven designed as a horizontal atmospheric oven with a counter module designed as a transport module.
- the oven door is preferably arranged vertically movable in the door box.
- the door box forming the lock is sealed off in a gas-tight manner and provides a volume which can be determined in terms of size and which can be flooded with protective gas as required.
- the door box On the side facing away from the furnace chamber, the door box has means for a gas-tight connection of the door latch to a correspondingly formed counter module.
- a counter module is used for loading and unloading the furnace according to the invention, wherein due to the above-described training of the door box a gas-tight arrangement of furnace on the one hand and counter module on the other hand can be accomplished in a secure manner.
- the counter module is preferably thermally insulated and gas-tight, so that it can pass a heat-treated workpiece in the furnace according to the invention or receive an already heat-treated workpiece from the oven at the end of the atmosphere surrounding the furnace.
- the loading of the furnace according to the invention using a counter module can be carried out as described below:
- the furnace according to the invention also called box furnace is available with closed furnace door at process fumigation and working temperature for the treatment of heat treated workpieces.
- the loaded with the heat treated workpieces cold counter module couples to the furnace.
- corresponding clamping devices may be provided on the furnace, which prevent a relative displacement between the furnace and counter module after a coupling operation.
- the furnace and the counter module form a solid unit.
- the door of the counter module is opened, as a result of which a common chamber formed by lock and counter module interior is formed.
- the thus formed chamber is flooded with nitrogen for flushing, it being possible for it to be provided that either the door box of the furnace and / or the counter module has a corresponding inlet for the supply of nitrogen.
- the counter module may already be under nitrogen, so that then only the air from the lock chamber must be flushed out before the two doors are opened.
- the nitrogen is blown off via a drain, preferably formed on the door box of the furnace.
- the oven door of the oven can now be opened and the counter-module batch of workpieces to be treated are transferred into the oven chamber of the oven.
- a push-pull chain arranged on the counter module can be provided, under the use of which the transport device carrying the heat-treated workpieces can be displaced out of the counter module into the furnace chamber of the furnace.
- the counter module under temperature and protective gas couples to the furnace according to the invention.
- the air is flushed out of the lock chamber formed between the furnace and the counter module with inert gas.
- the oven door of the oven and the door of the counter module are opened and the heat-treated batch is transferred by means of the pressure train chain of the counter module out of the oven chamber in the counter module. Both the oven door and the door of the counter module are then closed.
- the counter module is decoupled from the furnace, the heat-treated and still under temperature workpieces can be transported by the counter module to a trained quenching module.
- the atmospheric furnace according to the invention can work with nitrogen or else with combustible or partly toxic gases. Under certain circumstances, therefore, the heat-treated batch can not be transported under furnace atmosphere. Rather, it is necessary to rinse the furnace atmosphere with an inert protective gas before a conversion of the charge from the oven into the transport module, wherein this protective gas can be removed via a corresponding furnace exhaust gas line with flaring. Accordingly, the air from the lock chamber formed by the door box of the furnace via an exhaust gas point in the door box with an inert gas is carried out before a batch conversion.
- the heat-treated batch can be safely transferred and completed at the end of the furnace surrounding atmosphere in the example designed as a transport module counter module and subsequently subjected to a quenching treatment.
- a quenching treatment In the case of a combustible furnace atmosphere, this is either already rinsed in the oven shortly before a workpiece attachment in the counter module or only in the counter module shortly before the implementation of the workpieces, for example, in a quenching chamber.
- the oven according to the invention is further distinguished by its simple structure. It consists essentially of a cylindrically shaped furnace chamber, are arranged within the rod for heating the furnace chamber atmosphere rod-shaped heating elements.
- the furnace chamber has at its end a gas circulation device, which is preferably designed in the form of a fan. The fan is driven for free access by a motor located outside the oven chamber.
- the purpose of the gas circulation device is, as part of a heat treatment process, to circulate the furnace atmosphere in the furnace chamber as needed. Depending on the rotational speed of the gas circulation device designed as a fan, it is optionally possible to influence the degree of gas circulation.
- Axially parallel to the longitudinal extent of the furnace chamber rod-shaped heating elements are provided within the furnace chamber, which are arranged like a drum turret with respect to the gas circulation. This type of arrangement of the heating elements ensures that a workpiece located within the furnace chamber or a batch of workpieces formed from a plurality of workpieces is uniformly heated. As a result, reproducible heat treatment processes can be carried out in a particularly simple manner.
- the workpieces to be heat treated are preferably brought into the oven chamber by means of a transport device movably arranged on rails in the longitudinal direction of the oven chamber. If the transport device has moved into its end position within the furnace chamber for the purpose of heat treatment, the workpieces arranged on the transport device are located within the treatment area enclosed by the drum turret-like heating elements. This type of embodiment allows a uniform heating on all sides of the arranged within the furnace chamber workpieces.
- the oven has only one door, which is disposed within a lock forming a door box, so that at the end of the atmosphere surrounding the furnace workpieces in the Furnace entered as well as this can be taken out.
- the furnace chamber has a cylindrical shape, which advantageously serves to uniformly heat the workpieces arranged inside the furnace.
- the preferably formed as a fan gas circulation device is enclosed by the drum turret-like heating elements, so that with respect to the heat-treated workpieces a uniform circulation of the furnace atmosphere can be performed.
- the oven according to the invention allows an optimized integration into a module park formed from a plurality of ovens, which can each be approached for the purpose of loading and / or unloading by a correspondingly designed counter module. It is characterized by its high flexibility in connection with other treatment chambers. Furthermore, the oven according to the invention is due to its relatively simple construction maintenance and repair friendly.
- the method described above advantageously allows an oxidation-free heat treatment, because the workpieces to be heat treated are kept under protective gas in the course of the entire process implementation. An undesirable oxidation of the workpieces can be safely prevented.
- the transport chamber can be used elsewhere, whereby a high flexibility of the entire heat treatment plant is achieved.
- the reaction of the heat-treated workpieces from the atmospheric chamber furnace into the quenching chamber is also carried out under protective gas.
- the entire process of heat treatment including the quenching process can thus be carried out in an advantageous manner with the completion of the atmosphere surrounding the plant.
- the entire heat treatment process is thus completely free of oxidation with simultaneous flexibility of the individual plant components.
- the heat-treated workpieces are converted from the atmosphere chamber furnace in the transport chamber, wherein in the case of using a combustible inert gas atmosphere in the atmospheric chamber furnace with a non-flammable inert gas either by flushing the atmosphere chamber furnace shortly before a transfer of the workpieces in the transport chamber or by purging the transport chamber after a transfer of the workpieces is removed in the transport chamber.
- This process step is particularly advantageous if a heat treatment of the workpieces in the atmospheric chamber furnace under combustible inert gas atmosphere was performed.
- FIGS. 1 and 2 show the furnace according to the invention according to a preferred embodiment. This is not restrictive and is only the example closer explanation of the operation. Same parts are in the FIGS. 1 and 2 identified with the same reference numerals.
- the furnace 1 is formed from a steel housing 3, which has a secure footing via suitably formed feet 4. Within the steel housing 3, the furnace chamber 2 is formed, which has a arranged on the inside of the steel housing 3 insulation 5 for the purpose of thermal insulation.
- a gas circulation device in the form of a fan 9 is arranged to circulate the furnace chamber atmosphere. Operates the fan 9 by a motor 10 which is arranged externally accessible outside the furnace chamber 2. Drive technology connected to the motor 10 and the fan 9 by a unspecified drive shaft.
- heating elements 8 are rod-shaped and extend in the longitudinal direction 20 of the furnace chamber 2. As in particular Fig. 2 can be removed, the total of six heating elements 8 with respect to the fan. 9 arranged like a drum revolver and thus form a in the Fig. 2 schematically illustrated treatment area 22.
- the heat-treated charge 11 is preferably arranged centrally within the treatment area 22 for carrying out a heat treatment.
- Advantage of this arrangement is that the individual workpieces of the charge 11 are uniformly applied to the heat generated by the heating elements 8, which allows the implementation of a reproducible heat treatment process.
- the batch 11 is carried by a transport device 21 which stands on rails 6, which in turn are supported on the frame 7.
- the transport device is preferably arranged to be movable in the longitudinal direction 20.
- the fan 9 opposite the frontal furnace chamber 2 is provided with a loading and unloading, which can be opened or closed by a gas-tight final furnace door 12 either.
- the oven door 12 is arranged inside a door lock 13 forming a lock, within which the oven door 12 is displaceable in the height direction of the door box 13.
- Fig. 1 shows the oven door 12 in a position closing the loading and unloading of the oven.
- the furnace chamber 2 preferably has a process gas supply 14 on the front side.
- a protective gas supply 15 may be provided, via which, for example, nitrogen can be introduced into the furnace chamber 2.
- measuring devices 17 can also be provided.
- the pressure equalizing flap preferably has an integrated tear film, so that a corresponding pressure equalization is automatically carried out at critical pressure ratios.
- the oven has a flaring device 16, over if necessary, in the furnace chamber 2 befindliches process gas can be flared.
- this can be coupled in a gas-tight manner to a counter module, for example in the form of a transport module, by means of the door box 13 forming a gas-tight lock.
- heated batches can be fed out of the oven into the counter module or out of the counter module into the oven without any oxidation.
- Operates the furnace according to the invention for example, using flammable or toxic gases, such as CO, so that it may be necessary for a batch reaction in the counter module to rinse the atmosphere oven with an inert inert gas before, the inert gas via a corresponding furnace gas line with flaring is dissipated. Accordingly, the air is previously flushed out of the lock chamber of the door box 13 via a delivery point 23 in the door box 13 with an inert gas.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Tunnel Furnaces (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung in Form eines Atmosphärenofens zur Wärmebehandlung metallischer Werkstücke bei hohen Temperaturen. Auch betrifft die Erfindung ein Verfahren zur Wärmebehandlung metallischer Werkstücke in einem solchen Ofen.The invention relates to a device in the form of an atmosphere furnace for heat treatment of metallic workpieces at high temperatures. The invention also relates to a method for heat treatment of metallic workpieces in such a furnace.
Öfen der vorgenannten Art fanden bisher in vertikaler Bauweise als sogenannte Schachtöfen Verwendung. Von Nachteil bei einem Schachtofen ist jedoch, daß nach einer Wärmebehandlung der metallischen Werkstücke diese mittels eines Hebewerkzeuges aus dem Schachtofen gehoben und in ein dem Schachtofen nebengeordnetes Abschreckbad umgesetzt werden müssen. Während dieses Umsetzvorganges kommt es infolge des Kontakts der wärmebehandelten Werkstücke mit der Umgebungsluft in nachteiliger Weise zu einer Oxidation der wärmebehandelten Werkstücke, und zwar mit der Folge einer Randentkohlung und eines hiermit einhergehenden Qualitätsverlustes.Furnaces of the aforementioned type have hitherto been used in vertical construction as so-called shaft furnaces. A disadvantage of a shaft furnace, however, is that after a heat treatment of the metallic workpieces they must be lifted by means of a lifting tool from the shaft furnace and implemented in a side of the shaft furnace quenching. During this Umsetzvorganges occurs due to the contact of the heat-treated workpieces with the ambient air disadvantageously to an oxidation of the heat-treated workpieces, with the result of a Randentkohlung and a concomitant loss of quality.
Zur Überwindung der vorbeschriebenen Nachteile sind aus dem Stand der Technik horizontale Mehrkammeröfen bekannt geworden, die über ein integriertes Abschreckbad verfügen, so daß sowohl der Wärmebehandlungsvorgang als auch die Abschreckung gleichermaßen unter Schutzgas durchgeführt werden kann. Von Nachteil bei einem solchen Mehrzweckkammerofen ist jedoch die direkte Zuordnung des Abschreckbades zum Ofen, womit die Anlage als solche hinsichtlich der Abschreckung in unterschiedlichen Medien sehr inflexibel ist. Auch der Nutzungsgrad des im Mehrzweckkammerofen integrierten Abschreckbades ist nur sehr gering und liegt zumeist bei nur 10 % bis 20 %, da die Zyklusdauer der Erwärmung und der Wärmebehandlung meist ein Mehrfaches der Zyklusdauer der Abschreckung beträgt.To overcome the disadvantages described above, horizontal multichamber furnaces have become known from the prior art, which have an integrated quench bath, so that both the heat treatment process and the quenching can be carried out equally under protective gas. The disadvantage of such a multi-purpose chamber furnace, however, is the direct assignment of the quench bath to the oven, so that the system as such is very inflexible with respect to the deterrence in different media. Also the degree of utilization of the quench bath integrated in the multi-purpose chamber furnace is only very low and is usually only 10% to 20%, since the cycle duration of the heating and the heat treatment is usually a multiple of the cycle duration of the quenching.
Mit dem Ziel, die Abschreckungsflexibilität zu erhöhen, ist das sogenannte vertikale Glockenofensystem entwickelt worden. Bei diesem System sind die glockenförmig ausgebildeten Haubenöfen auf Schienen verfahrbar angeordnet und können oberhalb von entsprechend ausgebildeten Abschreckbädern hin- und hergefahren werden. Nach einer Wärmebehandlung der Werkstücke im Ofen können diese samt des Glockenofens über ein entsprechendes Abschreckbad verfahren werden, so daß im Unterschied zum vorbeschriebenen Mehrkammerofen eine flexible Abschreckung ermöglicht ist. Dabei erfolgt die Abschreckung durch ein möglichst nahes Annähern der Glockenofenöffnung an die obere Öffnung des Abschreckbades, wobei zur Vermeidung einer ungewollten Oxidation der wärmebehandelten Werkstücke der dabei entstehende schmale Zwischenspalt zwischen Abschreckbad einerseits und Glockenofenöffnung andererseits mit Stickstoff gespült wird. Eine völlig gasdichte Ankopplung an das Abschreckbad ist jedoch nicht möglich, so daß eine völlig oxidfreie Wärmebehandlung auch bei der Verwendung eines Glockenofensystems nicht erreicht werden kann.With the aim of increasing quenching flexibility, the so-called vertical baffle system has been developed. In this system, the bell-shaped hood ovens are arranged movably on rails and can be moved back and forth above appropriately designed quench baths. After a heat treatment of the workpieces in the oven, these can be moved together with the bell oven via a corresponding Abschreckbad, so that in contrast to the above-described multi-chamber oven a flexible deterrent is possible. In this case, the quenching takes place by the closest possible approach of the bell-hole opening to the upper opening of the quench bath, wherein to avoid unwanted oxidation of the heat-treated workpieces, the resulting narrow intermediate gap between quench bath on the one hand and bell oven opening on the other hand is purged with nitrogen. However, a completely gas-tight coupling to the Abschreckbad is not possible, so that a completely oxide-free heat treatment can not be achieved even when using a bell furnace system.
Aus der
Eine Vorrichtung zum Transportieren metallischer Werkstücke ist des weiteren aus der
Ausgehend vom vorgenannten Stand der Technik ist es Aufgabe der Erfindung, unter Vermeidung der vorgenannten Nachteile einen Ofen zur Wärmebehandlung metallischer Werkstücke bereitzustellen, der bei gleichzeitig einfachem Aufbau und Bedienkomfort autark, d. h. unabhängig von anderen Öfen, betreibbar und gasdicht an ein Gegenmodul ankoppelbar ist, so daß ein Be- und Entladen des Ofens unter Abschluß der den Ofen umgebenden Atmosphäre möglich ist, wobei auch ein Transport von wärmebehandelten Werkstücken unter einer sich von der Ofenatmosphäre unterscheidenden Atmosphäre möglich sein soll.Based on the aforementioned prior art, it is an object of the invention to provide a furnace for heat treatment of metallic workpieces while avoiding the aforementioned disadvantages, which is independently, ie independently of other furnaces, operable and gas-tight coupled to a counter module, so that a loading and unloading of the furnace is possible with the completion of the atmosphere surrounding the furnace, and a transport of heat-treated workpieces should be possible under an atmosphere different from the furnace atmosphere.
Gelöst wird diese Aufgabe durch einen horizontalen Atmosphärenofen zur Wärmebehandlung metallischer Werkstücke bei hohen Temperaturen, mit einer zylindrisch ausgebildeten Ofenkammer, wobei die Ofenkammer in der Ofenkammerwandung ausgebildete Gaseinlässe und/oder eine Abfackelungseinrichtung aufweist, und einer die Ofenkammer gasdicht verschließenden Ofentür, wobei die Ofentür innerhalb eines eine gasdicht verschließbare Schleuse bildenden Türkastens verfahrbar angeordnet ist, wobei der Türkasten Mittel für einen gasdichten Anschluß an ein korrespondierend ausgebildetes Gegenmodul aufweist und wobei der Türkasten eine Gasabgabestelle aufweist. This object is achieved by a horizontal atmosphere furnace for heat treatment of metallic workpieces at high temperatures, with a cylindrically shaped furnace chamber, wherein the furnace chamber in the Ofenkammerwandung formed gas inlets and / or flaring, and the furnace chamber gas-tight closing furnace door, wherein the furnace door within a a gas-tight lockable lock-forming door latch is movably arranged, wherein the door box means for a gas-tight connection to a corresponding having trained counter module and wherein the door box has a gas discharge point.
Hohe Temperaturen im Sinne der Erfindung sind Temperaturen von über 400°C bis zu 1.050°C.High temperatures in the context of the invention are temperatures of over 400 ° C up to 1050 ° C.
Der erfindungsgemäße Ofen zeichnet sich insbesondere durch seine gasdicht abschließende Ofentür einerseits und den die Schleuse bildenden Türkasten andererseits aus. Durch diese Bauelemente bedingt, kann der horizontal ausgebildete Atmosphärenofen gasdicht an beispielsweise als Transportmodule ausgebildete Gegenmodule angekoppelt werden. Unter Abschluß der den Ofen umgebenden Atmosphäre können so die einer Wärmebehandlung unterzogenen Werkstücke dem Ofen entnommen und in das Gegenmodul überführt werden. Da mittels des Türkastens eine vollständige Abdichtung zwischen Ofen einerseits und Gegenmodul andererseits sichergestellt werden kann, ist eine ungewollte Oxidation der wärmebehandelten Werkstücke sicher auszuschließen. Die erfindungsgemäße Ausbildung erlaubt es, den als horizontalen Atmosphärenofen ausgebildeten Ofen gasdicht mit einem als Transportmodul ausgebildeten Gegenmodul zu verkoppeln. Erreicht wird dadurch, daß ohne jegliche Oxidation erwärmte Werkstücke über das Transportmodul zu unterschiedlichen Abschreckmodulen transportiert und dort unter Schutzgas ohne Oxidation abgeschreckt werden können. Der Abschreckvorgang kann so vom Wärmebehandlungsvorgang im Ofen vollständig entkoppelt werden, so daß der erfindungsgemäße Ofen mit Blick auf unterschiedliche Abschreckmöglichkeiten in höchstem Maße flexibel ist.The oven according to the invention is characterized in particular by its gas-tight final oven door on the one hand and the door box forming the lock on the other. Due to these components, the horizontally formed atmospheric furnace can be coupled gas-tight to, for example, designed as transport modules counter modules. Upon completion of the atmosphere surrounding the furnace, the workpieces subjected to a heat treatment can be removed from the furnace and transferred to the counter module. Since a complete seal between the furnace on the one hand and counter module on the other hand can be ensured by means of the door box, an unwanted oxidation of the heat-treated workpieces is safe to exclude. The construction according to the invention makes it possible to gas-tightly connect the oven designed as a horizontal atmospheric oven with a counter module designed as a transport module. This is achieved by the fact that without any oxidation heated workpieces can be transported via the transport module to different quenching modules and quenched there under inert gas without oxidation. The quenching process can thus be completely decoupled from the heat treatment process in the oven, so that the oven according to the invention is highly flexible with regard to different quenching possibilities.
Mit Bezug auf die Längserstreckung des Ofens ist die Ofentür vorzugsweise senkrecht verfahrbar im Türkasten angeordnet. Der die Schleuse bildende Türkasten ist dabei seinerseits gasdicht abgeschlossen und stellt ein hinsichtlich der Größe bestimmbares Volumen zur Verfügung, das bedarfsgerecht mit Schutzgas geflutet werden kann. Auf der der Ofenkammer abgewandten Seite verfügt der Türkasten über Mittel für einen gasdichten Anschluß des Türkastens an ein korrespondierend ausgebildetes Gegenmodul. Ein solches Gegenmodul dient der Be- und Entladung des erfindungsgemäßen Ofens, wobei aufgrund der vorbeschriebenen Ausbildung des Türkastens eine gasdichte Anordnung von Ofen einerseits und Gegenmodul andererseits in sicherer Weise bewerkstelligt werden kann. Ebenso wie der Ofen ist das Gegenmodul vorzugsweise wärmeisoliert und gasdicht ausgebildet, so daß es unter Abschluß der die Ofenanlage umgebenden Atmosphäre ein wärmezubehandelndes Werkstück in den erfindungsgemäßen Ofen übergeben bzw. ein bereits wärmebehandeltes Werkstück aus dem Ofen empfangen kann.With respect to the longitudinal extent of the furnace, the oven door is preferably arranged vertically movable in the door box. In this case, the door box forming the lock is sealed off in a gas-tight manner and provides a volume which can be determined in terms of size and which can be flooded with protective gas as required. On the side facing away from the furnace chamber, the door box has means for a gas-tight connection of the door latch to a correspondingly formed counter module. Such a counter module is used for loading and unloading the furnace according to the invention, wherein due to the above-described training of the door box a gas-tight arrangement of furnace on the one hand and counter module on the other hand can be accomplished in a secure manner. As well as the furnace, the counter module is preferably thermally insulated and gas-tight, so that it can pass a heat-treated workpiece in the furnace according to the invention or receive an already heat-treated workpiece from the oven at the end of the atmosphere surrounding the furnace.
Das Beladen des erfindungsgemäßen Ofens unter Verwendung eines Gegenmoduls kann dabei wie nachfolgend beschrieben erfolgen: Der erfindungsgemäße Ofen, auch Boxofen genannt, steht mit geschlossener Ofentür bei Prozeßbegasung und unter Arbeitstemperatur für die Behandlung der wärmezubehandelnden Werkstücke bereit. Das mit den wärmezubehandelnden Werkstücken beladene kalte Gegenmodul koppelt an den Ofen an. Zu diesem Zweck können entsprechende Spanneinrichtungen am Ofen vorgesehen sein, die nach einem Koppelvorgang eine relative Verschiebung zwischen Ofen und Gegenmodul unterbinden. Infolge des Koppelvorgangs entsteht zwischen Ofentür einerseits und Gegenmodultür andererseits eine durch den Türkasten des Ofens ausgebildete Schleusenkammer. In dieser Stellung bilden der Ofen und das Gegenmodul eine feste Einheit. Im nachfolgenden wird die Türe des Gegenmoduls geöffnet, infolgedessen eine aus Schleuse und Gegenmodulinnenraum gebildete gemeinsame Kammer entsteht. Die so ausgebildete Kammer wird zwecks Spülung mit Stickstoff geflutet, wobei vorgesehen sein kann, daß entweder der Türkasten des Ofens und/oder das Gegenmodul über einen entsprechenden Einlaß zur Zuführung von Stickstoff verfügt. Ebenso kann auch das Gegenmodul bereits unter Stickstoff stehen, so daß dann nur die Luft aus der Schleusenkammer ausgespült werden muß, ehe die beiden Türen geöffnet werden. Während der Spülung wird der Stickstoff über einen vorzugsweise am Türkasten des Ofens ausgebildeten Ablaß abgeblasen. Im Anschluß daran kann nunmehr die Ofentür des Ofens geöffnet und die im Gegenmodul befindliche Charge an zu behandelnden Werkstücken in die Ofenkammer des Ofens überführt werden. Zu diesem Zweck kann eine am Gegenmodul angeordnete Druckzugkette vorgesehen sein, unter deren Verwendung die die wärmezubehandelnden Werkstücke tragende Transporteinrichtung aus dem Gegenmodul heraus in die Ofenkammer des Ofens verschoben werden kann. Sobald die wärmezubehandelnde Charge in die Ofenkammer des Ofens verbracht ist, werden sowohl die Ofentür des Ofens als auch die Tür des Gegenmoduls wieder geschlossen. Gegenmodul und Ofen können alsdann voneinander wieder entkoppelt werden und das Gegenmodul steht für weitere Transporte zur Verfügung. Innerhalb des Ofens findet nunmehr die thermochemische Behandlung der Charge statt.The loading of the furnace according to the invention using a counter module can be carried out as described below: The furnace according to the invention, also called box furnace is available with closed furnace door at process fumigation and working temperature for the treatment of heat treated workpieces. The loaded with the heat treated workpieces cold counter module couples to the furnace. For this purpose, corresponding clamping devices may be provided on the furnace, which prevent a relative displacement between the furnace and counter module after a coupling operation. As a result of the coupling process arises between the oven door on the one hand and counter module door on the other hand formed by the door box of the lock chamber. In this position, the furnace and the counter module form a solid unit. In the following, the door of the counter module is opened, as a result of which a common chamber formed by lock and counter module interior is formed. The thus formed chamber is flooded with nitrogen for flushing, it being possible for it to be provided that either the door box of the furnace and / or the counter module has a corresponding inlet for the supply of nitrogen. Likewise, the counter module may already be under nitrogen, so that then only the air from the lock chamber must be flushed out before the two doors are opened. During the flushing, the nitrogen is blown off via a drain, preferably formed on the door box of the furnace. Following this, the oven door of the oven can now be opened and the counter-module batch of workpieces to be treated are transferred into the oven chamber of the oven. For this purpose, a push-pull chain arranged on the counter module can be provided, under the use of which the transport device carrying the heat-treated workpieces can be displaced out of the counter module into the furnace chamber of the furnace. Once the heat-treated batch is placed in the furnace chamber of the furnace, both the oven door of the furnace as also the door of the counter module closed again. Counter module and oven can then be decoupled from each other again and the counter module is available for further transport. Within the furnace now takes place the thermochemical treatment of the batch.
Zur Entladung des erfindungsgemäßen Ofens wird die vorbeschriebene Reihenfolge in umgekehrter Weise durchgeführt: Das unter Temperatur und Schutzgas stehende Gegenmodul koppelt an den erfindungsgemäßen Ofen an. Zwecks Neutralisation wird die Luft aus der zwischen Ofen und Gegenmodul gebildeten Schleusenkammer mit Schutzgas ausgespült. Alsdann werden die Ofentür des Ofens und die Tür des Gegenmoduls geöffnet und die wärmebehandelte Charge wird mittels der Druckzugkette des Gegenmoduls aus der Ofenkammer hinaus in das Gegenmodul überführt. Sowohl die Ofentür als auch die Tür des Gegenmoduls werden alsdann geschlossen. Sobald das Gegenmodul vom Ofen entkoppelt ist, können die wärmebehandelten und noch unter Temperatur stehenden Werkstücke vom Gegenmodul zu einem korrespondierend ausgebildeten Abschreckmodul transportiert werden.For discharging the furnace according to the invention, the above-described sequence is carried out in the reverse manner: The counter module under temperature and protective gas couples to the furnace according to the invention. For the purpose of neutralization, the air is flushed out of the lock chamber formed between the furnace and the counter module with inert gas. Then, the oven door of the oven and the door of the counter module are opened and the heat-treated batch is transferred by means of the pressure train chain of the counter module out of the oven chamber in the counter module. Both the oven door and the door of the counter module are then closed. Once the counter module is decoupled from the furnace, the heat-treated and still under temperature workpieces can be transported by the counter module to a trained quenching module.
Der erfindungsgemäße Atmosphärenofen kann mit Stickstoff oder aber auch mit brennbaren oder zum Teil giftigen Gasen arbeiten. Unter Umständen kann daher die wärmebehandelte Charge nicht unter Ofenatmosphäre transportiert werden. Vielmehr ist es erforderlich, vor einer Umsetzung der Charge aus dem Ofen in das Transportmodul die Ofenatmosphäre mit einem inerten Schutzgas auszuspülen, wobei dieses Schutzgas über eine entsprechende Ofenabgasleitung mit Abfackelung abgeführt werden kann. Entsprechend wird auch vor einer Chargenumsetzung die Luft aus dem durch den Türkasten des Ofens gebildeten Schleusenraum über eine Abgasstelle im Türkasten mit einem Inertgas ausgeführt. Sobald der Ausspülvorgang erfolgreich abgeschlossen ist, kann die wärmebehandelte Charge gefahrlos und unter Abschluß der die Ofenanlage umgebenden Atmosphäre in das beispielsweise als Transportmodul ausgebildete Gegenmodul überführt und im nachfolgenden einer Abschreckbehandlung unterzogen werden. Im Falle einer brennbaren Ofenatmosphäre wird diese entweder bereits im Ofen kurz vor einer Werkstückansetzung in das Gegenmodul ausgespült oder aber erst im Gegenmodul kurz vor Umsetzung der Werkstücke beispielsweise in eine Abschreckkammer.The atmospheric furnace according to the invention can work with nitrogen or else with combustible or partly toxic gases. Under certain circumstances, therefore, the heat-treated batch can not be transported under furnace atmosphere. Rather, it is necessary to rinse the furnace atmosphere with an inert protective gas before a conversion of the charge from the oven into the transport module, wherein this protective gas can be removed via a corresponding furnace exhaust gas line with flaring. Accordingly, the air from the lock chamber formed by the door box of the furnace via an exhaust gas point in the door box with an inert gas is carried out before a batch conversion. Once the rinsing is completed successfully, the heat-treated batch can be safely transferred and completed at the end of the furnace surrounding atmosphere in the example designed as a transport module counter module and subsequently subjected to a quenching treatment. In the case of a combustible furnace atmosphere, this is either already rinsed in the oven shortly before a workpiece attachment in the counter module or only in the counter module shortly before the implementation of the workpieces, for example, in a quenching chamber.
Der erfindungsgemäße Ofen zeichnet sich des weiteren durch seinen einfachen Aufbau aus. Er besteht im wesentlichen aus einer zylindrisch ausgebildeten Ofenkammer, innerhalb der zur Aufheizung der Ofenkammeratmosphäre stabförmig ausgebildete Heizelemente angeordnet sind. Zur Umwälzung der Ofenkammeratmosphäre verfügt die Ofenkammer stirnseitig über eine Gasumwälzeinrichtung, die vorzugsweise in Form eines Ventilators ausgebildet ist. Der Ventilator wird zwecks freier Zugänglichkeit von einem außerhalb der Ofenkammer angeordneten Motor angetrieben. Zweck der Gasumwälzeinrichtung ist es, im Rahmen eines Wärmebehandlungsprozesses die in der Ofenkammer befindliche Ofenatmosphäre bedarfsgerecht umzuwälzen. Dabei kann je nach Drehgeschwindigkeit der als Ventilator ausgebildeten Gasumwälzeinrichtung wahlweise auf den Grad der Gasumwälzung Einfluß genommen werden.The oven according to the invention is further distinguished by its simple structure. It consists essentially of a cylindrically shaped furnace chamber, are arranged within the rod for heating the furnace chamber atmosphere rod-shaped heating elements. To circulate the furnace chamber atmosphere, the furnace chamber has at its end a gas circulation device, which is preferably designed in the form of a fan. The fan is driven for free access by a motor located outside the oven chamber. The purpose of the gas circulation device is, as part of a heat treatment process, to circulate the furnace atmosphere in the furnace chamber as needed. Depending on the rotational speed of the gas circulation device designed as a fan, it is optionally possible to influence the degree of gas circulation.
Achsparallel zur Längserstreckung der Ofenkammer sind innerhalb der Ofenkammer stabförmig ausgebildete Heizelemente vorgesehen, die in Bezug auf die Gasumwälzeinrichtung trommelrevolverartig angeordnet sind. Diese Art der Anordnung der Heizelemente stellt sicher, daß ein innerhalb der Ofenkammer befindliches Werkstück oder eine aus mehreren Werkstücken gebildete Werkstückcharge gleichmäßig erwärmt wird. Hierdurch lassen sich in besonders einfacher Weise reproduzierbare Wärmebehandlungsverfahren durchführen.Axially parallel to the longitudinal extent of the furnace chamber rod-shaped heating elements are provided within the furnace chamber, which are arranged like a drum turret with respect to the gas circulation. This type of arrangement of the heating elements ensures that a workpiece located within the furnace chamber or a batch of workpieces formed from a plurality of workpieces is uniformly heated. As a result, reproducible heat treatment processes can be carried out in a particularly simple manner.
Die wärmezubehandelnden Werkstücke werden vorzugsweise mittels einer auf Schienen in Längsrichtung der Ofenkammer bewegbar angeordneten Transporteinrichtung in die Ofenkammer verbracht. Ist die Transporteinrichtung zwecks Wärmebehandlung in ihre Endposition innerhalb der Ofenkammer verfahren, so befinden sich die auf der Transporteinrichtung angeordneten Werkstücke innerhalb des von den trommelrevolverartig angeordneten Heizelementen umschlossenen Behandlungsbereichs. Diese Art der Ausgestaltung ermöglicht eine allseitig gleichmäßige Erwärmung der innerhalb der Ofenkammer angeordneten Werkstücke.The workpieces to be heat treated are preferably brought into the oven chamber by means of a transport device movably arranged on rails in the longitudinal direction of the oven chamber. If the transport device has moved into its end position within the furnace chamber for the purpose of heat treatment, the workpieces arranged on the transport device are located within the treatment area enclosed by the drum turret-like heating elements. This type of embodiment allows a uniform heating on all sides of the arranged within the furnace chamber workpieces.
Die Vorteile des erfindungsgemäßen Ofens ergeben sich insbesondere durch seinen einfachen Aufbau. Für die Be- und Entladung verfügt der Ofen über nur eine Tür, die innerhalb eines eine Schleuse bildenden Türkastens angeordnet ist, so daß unter Abschluß der den Ofen umgebenden Atmosphäre Werkstücke in den Ofen hineingegeben als auch diesem herausgenommen werden können. Die Ofenkammer weist eine zylindrische Form auf, die in vorteilhafterweise der gleichmäßigen Wärmebehandlung der innerhalb des Ofens angeordneten Werkstücke dient. Die vorzugsweise als Ventilator ausgebildete Gasumwälzungseinrichtung wird von den trommelrevolverartig angeordneten Heizelementen umschlossen, so daß in Bezug auf die wärmezubehandelnden Werkstücke eine gleichmäßige Umwälzung der Ofenatmosphäre durchgeführt werden kann. Darüber hinaus gestattet der erfindungsgemäße Ofen eine optimierte Einbindung in einen aus mehreren Öfen gebildeten Modulpark, die jeweils zwecks Be- und/oder Entladung von einem korrespondierend ausgebildeten Gegenmodul angefahren werden können. Er zeichnet sich insofern durch seine hohe Flexibilität in Verbindung mit anderen Behandlungskammern aus. Ferner ist der erfindungsgemäße Ofen aufgrund seines vergleichsweise einfachen Aufbaus wartungs- und reparaturfreundlich.The advantages of the furnace according to the invention arise in particular by its simple structure. For loading and unloading, the oven has only one door, which is disposed within a lock forming a door box, so that at the end of the atmosphere surrounding the furnace workpieces in the Furnace entered as well as this can be taken out. The furnace chamber has a cylindrical shape, which advantageously serves to uniformly heat the workpieces arranged inside the furnace. The preferably formed as a fan gas circulation device is enclosed by the drum turret-like heating elements, so that with respect to the heat-treated workpieces a uniform circulation of the furnace atmosphere can be performed. In addition, the oven according to the invention allows an optimized integration into a module park formed from a plurality of ovens, which can each be approached for the purpose of loading and / or unloading by a correspondingly designed counter module. It is characterized by its high flexibility in connection with other treatment chambers. Furthermore, the oven according to the invention is due to its relatively simple construction maintenance and repair friendly.
Verfahrensseitig wird mit der Erfindung vorgeschlagen ein Verfahren zur Wärmebehandlung metallischer Werkstücke in einem horizontalen Atmosphärenkammerofen, bei dem die wärmezubehandelnden Werkstücke dem Atmosphärenkammerofen mittels einer gegenüber dem Atmosphärenkammerofen relativ verfahrbar angeordneten Transportkammer zugeführt werden, wobei
- in einem ersten Schritt die unter Schutzgas stehende Transportkammer an den Türkasten des Atmosphärenkammerofens gasdicht angekoppelt wird,
- in einem zweiten Schritt der vom Türkasten umschlossene Volumenraum sowie die Transportkammer mit Schutzgas gespült werden,
- in einem dritten Schritt die wärmezubehandelnden Werkstücke unter Schutzgasatmosphäre aus der Transportkammer in den Atmosphärenkammerofen umgesetzt werden und
- schließlich in einem vierten Schritt die in den Atmosphärenkammerofen umgesetzten Werkstücke unter Schutzgas wärmebehandelt werden.
- in a first step, the under inert gas transport chamber is coupled gas-tight to the door box of the atmosphere chamber furnace,
- in a second step, the volume space enclosed by the door box and the transport chamber are purged with protective gas,
- in a third step, the heat-treated workpieces are reacted under a protective gas atmosphere from the transport chamber in the atmosphere chamber furnace and
- Finally, in a fourth step, the converted into the atmosphere chamber furnace workpieces are heat treated under inert gas.
Das vorbeschriebene Verfahren ermöglicht in vorteilhafter Weise eine oxidationsfreie Wärmebehandlung, denn werden die wärmezubehandelnden Werkstücke im Zuge der gesamten Verfahrensdurchführung unter Schutzgas gehalten. Eine unerwünschte Oxidaton der Werkstücke kann so sicher unterbunden werden.The method described above advantageously allows an oxidation-free heat treatment, because the workpieces to be heat treated are kept under protective gas in the course of the entire process implementation. An undesirable oxidation of the workpieces can be safely prevented.
Nach einer Übergabe der wärmezubehandelnden Werkstücke aus der Transportkammer in den Atmosphärenkammerofen kann die Transportkammer anderweitig eingesetzt werden, wodurch eine hohe Flexibilität der gesamten Wärmebehandlungsanlage erzielt wird.After a transfer of the heat-treated workpieces from the transport chamber in the atmosphere chamber furnace, the transport chamber can be used elsewhere, whereby a high flexibility of the entire heat treatment plant is achieved.
Nach Abschluß der Wärmebehandlung können die Werkstücke zum Zwecke der Abschreckung in eine Abschreckkammer überführt werden. Mit der Erfindung vorgeschlagen wird in diesem Zusammenhang ein Verfahren, das dadurch gekennzeichnet ist, daß die Werkstücke nach Abschluß einer Wärmebehandlung mittels der Transportkammer einer Abschreckkammer zugeführt werden, wobei
- in einem ersten Schritt die wärmebehandelten Werkstücke unter Schutzgas aus dem Atmosphärenkammerofen in die an den Atmosphärenkammerofen gasdicht angekoppelte Transportkammer umgesetzt werden,
- in einem zweiten Schritt die Transportkammer und der Atmosphärenkammerofen gasdicht verschlossen werden,
- in einem dritten Schritt der vom Türkasten gebi!dete Volumenraum und die Transportkammer mit Stickstoffgas gespült wird,
- in einem vierten Schritt die Transportkammer vom Atmosphärenkammerofen abgekoppelt wird,
- in einem fünften Schritt die Transportkammer zur Abschreckkammer verfahren und gasdicht an die Abschreckkammer angekoppelt wird,
- in einem sechsten Schritt die Luft aus dem vom Türkasten gebildeten Volumenraum zwischen Transportkammer und Abschreckkammer mit Stickstoffgas ausgespült wird,
- in einem siebten Schritt die Werkstücke unter Schutzgas aus der Transportkammer in die Abschreckkammer nach einem Öffnen der Türen beider Kammern umgesetzt werden und
- schließlich in einem achten Schritt die in die Abschreckkammer umgesetzten Werkstücke nach einem Schließen der Türen der beiden Kammern abgeschreckt werden.
- in a first step, the heat-treated workpieces are reacted under protective gas from the atmospheric chamber furnace into the transport chamber gas-tightly coupled to the atmospheric chamber furnace,
- in a second step, the transport chamber and the atmospheric chamber furnace are sealed gas-tight,
- in a third step, the volume space bounded by the door box and the transport chamber are purged with nitrogen gas,
- in a fourth step, the transport chamber is decoupled from the atmospheric chamber furnace,
- in a fifth step, the transport chamber is moved to the quenching chamber and coupled gas-tight to the quenching chamber,
- in a sixth step, the air is flushed out of the volume space formed by the door box between the transport chamber and quenching chamber with nitrogen gas,
- in a seventh step, the workpieces are reacted under protective gas from the transport chamber into the quenching chamber after opening the doors of both chambers and
- Finally, in an eighth step, the converted into the quenching chamber workpieces are quenched after closing the doors of the two chambers.
Gemäß vorbeschriebenem Verfahren erfolgt auch die Umsetzung der wärmebehandelten Werkstücke aus dem Atmosphärenkammerofen in die Abschreckkammer unter Schutzgas. Der gesamte Vorgang der Wärmebehandlung einschließlich des Abschreckvorganges kann somit in vorteilhafter Weise unter Abschluß der die Anlage umgebenden Atmosphäre durchgeführt werden. Der gesamte Wärmebehandlungsprozeß erfolgt damit bei gleichzeitiger Flexibilität der einzelnen Anlagenkomponenten völlig oxidationsfrei.According to the above-described method, the reaction of the heat-treated workpieces from the atmospheric chamber furnace into the quenching chamber is also carried out under protective gas. The entire process of heat treatment including the quenching process can thus be carried out in an advantageous manner with the completion of the atmosphere surrounding the plant. The entire heat treatment process is thus completely free of oxidation with simultaneous flexibility of the individual plant components.
Gemäß einem weiteren Verfahrensmerkmal wird mit der Erfindung vorgeschlagen, daß nach Abschluß der Wärmebehandlung die wärmebehandelten Werkstücke aus dem Atmosphärenkammerofen in die Transportkammer umgesetzt werden, wobei im Fall des Einsatzes einer brennbaren Schutzgasatmosphäre im Atmosphärenkammerofen diese mit einem nicht brennbaren Schutzgas entweder durch Spülung des Atmosphärenkammerofens kurz vor einem Umsetzen der Werkstücke in die Transportkammer oder durch Spülung der Transportkammer nach einem Umsetzen der Werkstücke in die Transportkammer entfernt wird. Dieser Verfahrensschritt ist insbesondere dann von Vorteil, wenn eine Wärmebehandlung der Werkstücke im Atmosphärenkammerofen unter brennbarer Schutzgasatmosphäre durchgeführt wurde. Durch eine Spülung des Atmosphärenkammerofens bzw. der Transportkammer mit einem beispielsweise inerten Schutzgas kann so die brennbare Schutzgasatmosphäre aus dem Atmosphärenkammerofen bzw. der Transportkammer ausgespült werden. Entsprechend muß nach jedem Ankoppelvorgang der Schleusenraum (Türkasten) zwischen beiden Kammern von Luft freigespült werden (mit Stickstoff) genau wie vor jedem Abkoppelvorgang vom Atmosphärenkammerofen die brennbare Ofenatmosphäre aus dem Schleusenraum (Türkasten) durch Spülen mit Stickstoff entfernt werden muß.According to a further feature of the method is proposed with the invention that after completion of the heat treatment, the heat-treated workpieces are converted from the atmosphere chamber furnace in the transport chamber, wherein in the case of using a combustible inert gas atmosphere in the atmospheric chamber furnace with a non-flammable inert gas either by flushing the atmosphere chamber furnace shortly before a transfer of the workpieces in the transport chamber or by purging the transport chamber after a transfer of the workpieces is removed in the transport chamber. This process step is particularly advantageous if a heat treatment of the workpieces in the atmospheric chamber furnace under combustible inert gas atmosphere was performed. By flushing the atmosphere chamber furnace or the transport chamber with an inert inert gas, for example, so that the combustible protective gas atmosphere can be flushed out of the atmosphere chamber furnace or the transport chamber. Accordingly, the lock space (door box) must after each Ankoppelvorgang between two chambers of air are flushed (with nitrogen) just as before each Abkoppelvorgang from the atmospheric chamber furnace, the combustible furnace atmosphere from the lock chamber (door box) must be removed by purging with nitrogen.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der Beschreibung anhand der nachfolgenden Figuren. Dabei zeigen:
- Fig. 1:
- schematisch in geschnittener Seitenansicht den erfindungsgemäßen Ofen gemäß einer bevorzugten Ausführungsform und
- Fig. 2:
- den erfindungsgemäßen Ofen in einer geschnittenen Ansicht gemäß der Schnittlinie II-II in
Fig. 1 .
- Fig. 1:
- schematically in a sectional side view of the furnace according to the invention according to a preferred embodiment and
- Fig. 2:
- the furnace according to the invention in a sectional view along the section line II-II in
Fig. 1 ,
Die
Gebildet ist der Ofen 1 aus einem Stahlgehäuse 3, das für einen sicheren Stand über entsprechend ausgebildete Füße 4 verfügt. Innerhalb des Stahlgehäuses 3 ist die Ofenkammer 2 ausgebildet, die zwecks Wärmeisolierung über eine an der Innenseite des Stahlgehäuses 3 angeordnete Isolierung 5 verfügt.The furnace 1 is formed from a
Innerhalb der Ofenkammer 2 ist zur Umwälzung der Ofenkammeratmosphäre eine Gasumwälzeinrichtung in Form eines Ventilators 9 angeordnet. Betrieben wird der Ventilator 9 durch einen Motor 10, der von außen zugänglich außerhalb der Ofenkammer 2 angeordnet ist. Antriebstechnisch verbunden sind der Motor 10 und der Ventilator 9 durch eine nicht näher bezeichnete Antriebswelle.Within the
Zur Wärmebehandlung einer innerhalb der Ofenkammer 2 angeordneten Charge 11 dienen die innerhalb der Ofenkammer 2 ausgebildeten Heizelemente 8. Die Heizelemente 8 sind stabförmig ausgebildet und erstrecken sich in Längsrichtung 20 der Ofenkammer 2. Wie insbesondere
Die wärmezubehandelnde Charge 11 wird zur Durchführung einer Wärmebehandlung vorzugsweise mittig innerhalb des Behandlungsbereiches 22 angeordnet. Vorteil dieser Anordnung ist, daß die einzelnen Werkstücke der Charge 11 gleichmäßig mit der durch die Heizelemente 8 erzeugten Wärme beaufschlagt werden, was die Durchführung eines reproduzierbaren Wärmebehandlungsprozesses ermöglicht.The heat-treated
Getragen wird die Charge 11 von einer Transporteinrichtung 21, die auf Schienen 6 steht, die sich wiederum auf dem Gestell 7 abstützen. Die Transporteinrichtung ist vorzugsweise in Längsrichtung 20 verfahrbar angeordnet.The
Die dem Ventilator 9 gegenüberliegende stirnseitige Ofenkammer 2 ist mit einer Be- und Entladungsöffnung versehen, die durch ein gasdicht abschließende Ofentür 12 wahlweise geöffnet oder verschlossen werden kann. Die Ofentür 12 ist dabei innerhalb eines eine Schleuse bildenden Türkastens 13 angeordnet, innerhalb welchem die Ofentür 12 in Höhenrichtung des Türkastens 13 verschiebbar ist.
Zur Schaffung einer wahlweise gewünschten Ofenatmosphäre weist die Ofenkammer 2 vorzugsweise stirnseitig eine Prozeßgaszuführung 14 auf. Darüber hinaus kann eine Schutzgaszuführung 15 vorgesehen sein, über die beispielsweise Stickstoff in die Ofenkammer 2 eingebracht werden kann. Zur Überprüfung der in der Ofenkammer 2 eingestellten Ofenatmosphäre können zudem Meßgeräte 17 vorgesehen sein.In order to create an optionally desired furnace atmosphere, the
Im Falle einer Überdrucksituation innerhalb der Ofenkammer 2 kann diese durch die nur schematisch dargestellte Öffnung 18, die mit einer Druckausgleichsklappe 19 verschlossen ist, bedarfsgerecht entspannt werden. Die Druckausgleichsklappe verfügt vorzugsweise über eine integrierte Reißfolie, so daß bei kritischen Überdruckverhältnissen ein entsprechender Druckausgleich selbsttätig vorgenommen wird. Auch verfügt der Ofen über eine Abfackeleinrichtung 16, über die bedarfsweise in der Ofenkammer 2 befindliches Prozeßgas abgefackelt werden kann.In the case of an overpressure situation within the
Von besonderem Vorteil ist bei dem erfindungsgemäßen Ofen, daß dieser mittels des eine gasdichte Schleuse bildenden Türkastens 13 gasdicht an ein Gegenmodul, beispielsweise in Form eines Transportmoduls angekoppelt werden kann. Unter Abschluß der den Ofen umgebenden Atmosphäre können so ohne jegliche Oxidation erwärmte Chargen aus dem Ofen heraus in das Gegenmodul bzw. aus dem Gegenmodul heraus in den Ofen hineingegeben werden. Betrieben wird der erfindungsgemäße Ofen beispielsweise unter Verwendung brennbarer oder auch giftiger Gase, wie zum Beispiel CO, so daß es für eine Chargenumsetzung in das Gegenmodul erforderlich sein kann, den Atmosphärenofen mit einem inerten Schutzgas zuvor auszuspülen, wobei das Schutzgas über eine entsprechende Ofengasleitung mit Abfackelung abgeführt wird. Dementsprechend wird auch vorher die Luft aus dem Schleusenraum des Türkastens 13 über eine Abgabestelle 23 im Türkasten 13 mit einem Inertgas ausgespült.It is particularly advantageous in the oven according to the invention that this can be coupled in a gas-tight manner to a counter module, for example in the form of a transport module, by means of the
- 11
- Ofenoven
- 22
- Ofenkammerfurnace chamber
- 33
- Stahlgehäusesteel case
- 44
- Fußfoot
- 55
- Isolierunginsulation
- 66
- Schienerail
- 77
- Gestellframe
- 88th
- Heizelementheating element
- 99
- Ventilatorfan
- 1010
- Motorengine
- 1111
- Chargecharge
- 1212
- Ofentüroven door
- 1313
- Türkastendoor box
- 1414
- ProzeßgaszuführungProcess gas supply
- 1515
- SchutzgaszuführungProtective gas supply
- 1616
- Abfackelungseinrichtungburn-off
- 1717
- Meßgerätgauge
- 1818
- Öffnungopening
- 1919
- DruckausgleichsklappePressure equalization valve
- 2020
- Längsrichtunglongitudinal direction
- 2121
- Transporteinrichtungtransport means
- 2222
- Behandlungsbereichtreatment area
- 2323
- Abgabestelledelivery point
Claims (10)
- Horizontal atmosphere furnace for heat treatment of metallic work pieces (11) at high temperatures, comprising a cylindrically formed furnace chamber (2) which includes gas inlets (14, 15) formed in the furnace chamber wall and/or a flare installation (16), and a furnace door (12) for sealing the furnace chamber (2) in a gas-tight fashion, wherein said furnace door (12) is arranged for displacement inside a door box (13) forming a sluice which can be closed in a gas-tight fashion, wherein said door box (13) includes means for gas-tight connection to a correspondingly formed counter module, and wherein said door box (13) includes a gas discharge position (23).
- Horizontal atmosphere furnace according to claim 1, characterized in that the furnace door (12) can be displaced vertically with respect to the longitudinal direction (20) of the furnace chamber (2).
- Horizontal atmosphere furnace according to one of the claims 1 or 2, characterized in that a heat treatment at temperatures of 400°C to 1050°C can be conducted.
- Horizontal atmosphere furnace, characterized by a gas circulation device (9) which is arranged inside the furnace chamber (2).
- Horizontal atmosphere furnace according to one of the preceding claims, characterized by several bar-shaped heating elements (8) which extend in the longitudinal direction (20) of the furnace chamber (2) and are arranged in the fashion of a horizontal-axis turret.
- Horizontal atmosphere furnace according to one of the preceding claims, characterized in that the gas circulation device (9) is a motor-driven fan, wherein the driving unit (10) for the fan is arranged externally of the furnace chamber (2) for being accessed from outside.
- Horizontal atmosphere furnace according to one of the preceding claims, characterized in that inside the furnace chamber (2) a transportation device (21) for receiving work pieces (11) to be subjected to heat treatment is arranged for displacement on rails (6) in the longitudinal direction (20) of the furnace chamber (2).
- Method for heat treatment of metallic work pieces in a horizontal atmosphere furnace, in which method the work pieces to be subjected to heat treatment are supplied to the atmosphere furnace by means of a transportation chamber which is arranged for displacement relative to the atmosphere furnace, wherein- in a first step the transportation chamber which is under protective gas is coupled in a gas-tight fashion to the door box of the atmosphere furnace,- in a second step the volume space enclosed by the door box as well as the transportation chamber are washed by protective gas,- in a third step the work pieces to be subjected to heat treatment are transferred from the transportation chamber into the atmosphere furnace and finally- in a fourth step the work pieces which have been transferred into the atmosphere chamber furnace are subjected to heat treatment under protective gas.
- Method according to claim 8, characterized in that after the termination of a heat treatment the work pieces are supplied to a quenching chamber by means of the transportation chamber, wherein- in a first step the heat-treated work pieces are transferred under protective gas from the atmosphere furnace into the transportation chamber which is coupled in a gas-tight fashion to the atmosphere furnace,- in a second step the transportation chamber and the atmosphere furnace are sealed in a gas-tight fashion,- in a third step the volume space formed by the door box as well as the transportation chamber are washed by nitrogen gas,- in a fourth step the transportation chamber is uncoupled from the atmosphere furnace,- in a fifth step the transportation chamber is moved to the quenching chamber and coupled in a gas-tight fashion to the quenching chamber,- in a sixth step the air is washed out from the volume space formed by the door box between the transportation chamber and the quenching chamber using nitrogen gas,- in a seventh step the work pieces, after opening the doors of both chambers, are transferred under protective gas from the transportation chamber into the quenching chamber and finally- in an eighth step, after closing the doors of both chambers, the work pieces which have been transferred into the quenching chamber are quenched.
- Method according to claim 9, characterized in that prior to transferring the work pieces into the transportation chamber the atmosphere furnace is washed by protective gas.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50311015T DE50311015D1 (en) | 2003-11-14 | 2003-11-14 | Apparatus and method for heat treatment of metallic workpieces |
AT03026214T ATE419398T1 (en) | 2003-11-14 | 2003-11-14 | DEVICE AND METHOD FOR THE HEAT TREATMENT OF METAL WORKPIECES |
EP03026214A EP1531186B1 (en) | 2003-11-14 | 2003-11-14 | Apparatus and method for heat treatment of metallic work pieces |
US10/579,218 US20080023892A1 (en) | 2003-11-14 | 2004-09-11 | Device and Method for Heat Treating, in Particular, Metallic Workpieces |
PCT/EP2004/010176 WO2005052197A1 (en) | 2003-11-14 | 2004-09-11 | Device and method for heat treating, in particular, metallic workpieces |
RU2006120538/02A RU2327746C2 (en) | 2003-11-14 | 2004-09-11 | Method and device for thermal treatment, of metal items treatment in particular |
CNA2004800331920A CN1878878A (en) | 2003-11-14 | 2004-09-11 | Apparatus and method for heat treatment of metallic work pieces |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03026214A EP1531186B1 (en) | 2003-11-14 | 2003-11-14 | Apparatus and method for heat treatment of metallic work pieces |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1531186A1 EP1531186A1 (en) | 2005-05-18 |
EP1531186B1 true EP1531186B1 (en) | 2008-12-31 |
Family
ID=34429370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03026214A Expired - Lifetime EP1531186B1 (en) | 2003-11-14 | 2003-11-14 | Apparatus and method for heat treatment of metallic work pieces |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080023892A1 (en) |
EP (1) | EP1531186B1 (en) |
CN (1) | CN1878878A (en) |
AT (1) | ATE419398T1 (en) |
DE (1) | DE50311015D1 (en) |
RU (1) | RU2327746C2 (en) |
WO (1) | WO2005052197A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102192652A (en) * | 2010-03-08 | 2011-09-21 | 台技工业设备股份有限公司 | Heating device and heating system |
US20130078591A1 (en) * | 2011-09-22 | 2013-03-28 | Chia Hao Chang | Anti-scald protection apparatus for air heater |
EP2607503B1 (en) * | 2011-12-22 | 2016-10-12 | Ipsen, Inc. | Quenching chamber with an integral access door |
CN102676774A (en) * | 2012-05-31 | 2012-09-19 | 无锡宇吉科技有限公司 | Furnace door frame sealing structure of car-type heat treating furnace |
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 |
CN105018715B (en) * | 2015-08-24 | 2017-03-08 | 武汉富瑞能源科技有限公司 | Horizontal bell furnace |
JP2020041737A (en) * | 2018-09-10 | 2020-03-19 | 光洋サーモシステム株式会社 | Heat treatment device |
CN112129803A (en) * | 2019-06-24 | 2020-12-25 | 上海宝信软件股份有限公司 | Process cavity structure of strip steel heat treatment process simulation experiment device |
DE102019006940A1 (en) * | 2019-10-05 | 2021-05-06 | Daniel Haug | Device for delaying metal dusting at the cold-warm transitions in heat treatment systems which are operated with carbon-containing atmospheres in the process interior. |
CN111850282A (en) * | 2020-07-23 | 2020-10-30 | 艾亦特工业炉(太仓)有限公司 | Horizontal cylindrical furnace |
CN111663026A (en) * | 2020-07-29 | 2020-09-15 | 赣州市合安科技有限公司 | Hot air circulation heat treatment furnace |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3399875A (en) * | 1966-04-21 | 1968-09-03 | Alco Standard Corp | Heat treating furnace |
JPH06174377A (en) * | 1992-12-04 | 1994-06-24 | Komatsu Ltd | Multipurpose controlled atmosphere heat treatment equipment |
FR2782156B1 (en) * | 1998-08-05 | 2001-01-19 | Fours Ind B M I Baudasse Marti | DEVICE FOR CONVEYING A LOAD BETWEEN SEVERAL VACUUM ENCLOSURES AND VACUUM PROCESSING UNIT PROVIDED WITH SUCH A DEVICE |
EP1229137B1 (en) * | 2001-01-26 | 2006-08-09 | Ipsen International GmbH | Installation and process for the transport of metallic workpieces and installation for the heat treatment of metallic workpieces |
JP2003294368A (en) * | 2002-03-29 | 2003-10-15 | Tdk Corp | Heat treatment device and heat treatment method |
-
2003
- 2003-11-14 EP EP03026214A patent/EP1531186B1/en not_active Expired - Lifetime
- 2003-11-14 DE DE50311015T patent/DE50311015D1/en not_active Expired - Lifetime
- 2003-11-14 AT AT03026214T patent/ATE419398T1/en active
-
2004
- 2004-09-11 US US10/579,218 patent/US20080023892A1/en not_active Abandoned
- 2004-09-11 WO PCT/EP2004/010176 patent/WO2005052197A1/en active Application Filing
- 2004-09-11 RU RU2006120538/02A patent/RU2327746C2/en not_active IP Right Cessation
- 2004-09-11 CN CNA2004800331920A patent/CN1878878A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
RU2006120538A (en) | 2007-12-20 |
EP1531186A1 (en) | 2005-05-18 |
CN1878878A (en) | 2006-12-13 |
RU2327746C2 (en) | 2008-06-27 |
DE50311015D1 (en) | 2009-02-12 |
WO2005052197A1 (en) | 2005-06-09 |
US20080023892A1 (en) | 2008-01-31 |
ATE419398T1 (en) | 2009-01-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1531186B1 (en) | Apparatus and method for heat treatment of metallic work pieces | |
EP0151700B1 (en) | Industrial furnace, especially a multiple chamber vacuum furnace, for heat treating batches of metal workpieces | |
EP0422353A2 (en) | Furnace for the partial thermic treatment of tools | |
EP0621904B1 (en) | Device for heat-treating metal workpieces | |
EP2717008A2 (en) | Gas-tight industrial furnace supplied with protecting gas, in particular chamber furnace, pusher type furnace or ring hearth furnace | |
EP1229137B1 (en) | Installation and process for the transport of metallic workpieces and installation for the heat treatment of metallic workpieces | |
DE10310739A1 (en) | Device for heat treating workpieces has an opening for charging/discharging in the outer wall of a rotary furnace in a last treatment zone | |
WO2022218829A1 (en) | Method for the heat treatment of metal workpieces | |
DE2051743A1 (en) | Case hardening plant | |
EP1767660B1 (en) | Method of operating a single chamber vacuum furnace for hydrogen quenching | |
WO2016124309A1 (en) | Method, furnace installation and system for the hot stamping of workpieces | |
EP2685193A1 (en) | Method and rotary hearth furnace for heat treating workpieces | |
DE19919738A1 (en) | Continuous furnace with a device for quenching workpieces and quenching processes | |
EP0829554B1 (en) | Low pressure carburising device with a plurality of sequentially arranged chambers | |
WO1989012111A1 (en) | Heat-treatment process for metallic workpieces | |
DE19628383A1 (en) | Furnace for heat treatment of batches of metal workpieces - with a heating chamber which can be isolated from the pressure and suction chambers of the cooling gas fan | |
EP1153146B1 (en) | Continuous furnace comprising a device for quenching workpieces and quenching method | |
EP1006202A2 (en) | Process and device for heat treating workpieces | |
DE19514289A1 (en) | Heat treatment process in two differing furnaces | |
EP0716152A1 (en) | Process for heat treating workpieces | |
WO2002036835A1 (en) | Heat-treatment furnace having a deep-cooling system | |
DE3242418A1 (en) | Device for chemical and thermal processing of workpieces of metallic materials in a controlled atmosphere | |
DE2628605C3 (en) | Single chamber tempering furnace | |
DE60012529T2 (en) | Heat treatment plant for loads of metallic workpieces | |
DE3031660A1 (en) | Multipurpose furnace plant having handling trolley - on track alongside furnace quenching annealing and other units |
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 |
|
17P | Request for examination filed |
Effective date: 20040529 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK |
|
AKX | Designation fees paid |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH Ref country code: CH Ref legal event code: EP |
|
REF | Corresponds to: |
Ref document number: 50311015 Country of ref document: DE Date of ref document: 20090212 Kind code of ref document: P |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: GERMAN |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090411 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FD4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090601 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 |
|
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 |
Effective date: 20091001 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090331 |
|
BERE | Be: lapsed |
Owner name: IPSEN INTERNATIONAL G.M.B.H. Effective date: 20091130 |
|
EUG | Se: european patent has lapsed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20091114 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20100730 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090401 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091114 |
|
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: 20091114 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091115 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20090701 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20081231 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20141119 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20141120 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20141127 Year of fee payment: 12 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 50311015 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MM01 Ref document number: 419398 Country of ref document: AT Kind code of ref document: T Effective date: 20151114 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20151114 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20151114 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20160601 |