EP0221329B1 - Procédé et installation de trempe de produits recuits - Google Patents

Procédé et installation de trempe de produits recuits Download PDF

Info

Publication number
EP0221329B1
EP0221329B1 EP86113242A EP86113242A EP0221329B1 EP 0221329 B1 EP0221329 B1 EP 0221329B1 EP 86113242 A EP86113242 A EP 86113242A EP 86113242 A EP86113242 A EP 86113242A EP 0221329 B1 EP0221329 B1 EP 0221329B1
Authority
EP
European Patent Office
Prior art keywords
tank
quenching
bath container
container
quenching bath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86113242A
Other languages
German (de)
English (en)
Other versions
EP0221329A1 (fr
Inventor
Gerhard Dreizler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aichelin GmbH Germany
Original Assignee
Aichelin GmbH Germany
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aichelin GmbH Germany filed Critical Aichelin GmbH Germany
Priority to AT86113242T priority Critical patent/ATE44772T1/de
Publication of EP0221329A1 publication Critical patent/EP0221329A1/fr
Application granted granted Critical
Publication of EP0221329B1 publication Critical patent/EP0221329B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • 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
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • C21D1/64—Quenching devices for bath quenching with circulating liquids

Definitions

  • the invention relates to a device for quenching annealing material according to the preamble of claim 1.
  • a generic device is known from DE-A 1 583 343 and is used there in connection with a vacuum annealing furnace. This is connected via a lock to another container, which forms the quench bath container. From the quench bath tank, two pipes with a very different cross-section lead to the tank, a shut-off valve being arranged in the pipe with the large cross-section and the pump in the pipe with the small cross-section. With the help of the pump, the quenching medium can be conveyed from the quenching bath container into the tank when the valve is closed, in order to empty the quenching bath container before introducing the annealing material.
  • the shut-off valve is opened and the quenching medium can be returned to the quench bath container via the pipeline with the large cross-section, possibly with compressed air support.
  • the tank in which the quenching medium is temporarily stored is designed as a pressure container and, apart from the pipes through which the quenching medium flows, there are no further connections to the quenching bath container, which in turn is a vacuum vessel.
  • a device in which an annealing furnace is also fixedly arranged above the quench bath tank.
  • the annealing furnace of this known system is designed as a hood furnace and can only be loaded from below from the direction of the quench bath tank.
  • the quenching medium is first conveyed from the quenching bath container into a tank with the aid of a pump, so that the annealing material can be brought dry into the furnace through the quenching bath container. While the annealing material is being heated up to the quench bath temperature there, the quenching medium is conveyed back from the tank into the quenching bath tank with another pump, so that the heated annealing material can be quenched in the usual way by immersing it in the quenching medium. Since there is a lot of time available for pumping the quenching medium back into the quench bath tank, the other pump is only relatively weakly dimensioned and the connecting lines between the tank and the storage tank also have a small cross section.
  • a particularly space-saving arrangement results if the quench bath container is arranged in the tank itself.
  • the top of the tank contains an opening that is aligned with the fill opening of the quench bath tank.
  • the filling opening of the quenching bath container and / or the tank is assigned a slide which can be moved back and forth between two positions, by means of which the filling opening can be closed from the floods of the quenching bath container, while at the same time Pressure equalization as a result of the vapors generated in the tank and / or the quench bath container have a ventilation opening which directs the vapors to the outside in a controlled manner.
  • the pipeline advantageously opens below the lower limit of the annealing material introduced into the quench bath container.
  • the quenching medium is pumped out of the quenching bath tank, air can be sucked in and consequently the quenching medium cannot be mixed with air, because the mouth of the pipeline in the quenching bath tank remains flooded in all operating settings.
  • the quenching bath itself has considerable temperatures and, under certain circumstances, may have an aggressive long-term effect, it is not readily possible to submerge the drive device for the pump device.
  • sealing problems can be avoided if the pipeline in the tank has a vertically upwardly extending pipe section, the upper opening of which is below the operationally lowest level of the quenching medium in the tank, with a propeller in the vertical pipe section from its upper opening bearing output shaft of the drive device protrudes.
  • the drive device can thus be easily installed on the top of the tank in the extension of the pipe section without the risk that quenching medium can escape in liquid form in the area of the shaft seal.
  • the quenching process itself is not beneficial if the quenching medium is heavily permeated with air or foams in the tank.
  • foaming of the quenching medium could be caused by the pump drawing air from the quenching bath container after emptying the quenching bath container and swirling it with the quenching medium.
  • the drive power for the pump device could be reduced when the level in the quench bath tank falls below the lower level with the aid of a level sensor, so that the pump device is just able to prevent the quench medium from flowing back into the quench bath tank.
  • it is easier to use a calibratable bypass ver Provide a bond between the tank and the quench tank, which opens into the lower part of the quench tank.
  • This type of level adjustment has the advantage that there is no need for additional switches or other mechanical elements, which is a significant advantage particularly under the difficult thermal conditions of such quench baths.
  • the container cross section is advantageously adapted essentially to the cross section of the annealing material or the pallet carrying the annealing material.
  • this adaptation has the advantage that as much quenching medium as can be sprayed away is captured by the container wall even if the filler opening remains open.
  • a lifting device is to be arranged next to the bell furnace, which has a boom that can be moved up and down in the hardening bath container and can be brought into the appropriate position by means of a vertical guide, if the boom is up protruding stand, which receives the annealed material or the pallet carrying the annealed material, it is possible with appropriate dimensioning of the length of the stand to leave the boom in the raised position within the tank or the container while the stand through the filler opening protrudes upwards, so that no additional openings need to be contained for the boom itself, through which quenching medium can possibly escape.
  • the cross section of the quench bath container is adapted to the cross section of the pallet together with the extension extending therefrom in order to keep the volume of the hardening medium to be pumped as low as possible.
  • Fig. 1 shows a device 1 for quenching annealing material 2, which was previously heated outside the device 1 in a bell furnace 3 to the necessary conversion temperature.
  • the bell furnace 3 can be displaced above the device 1 by means of two rails 4 and 5 which run horizontally at a distance from one another and perpendicular to the plane of the drawing.
  • a carriage is attached to the bell furnace 3, the schematically indicated rollers 6, 7 and 8 running along the rails 4 and 5.
  • the device 1 for quenching the annealing material 2 contains a cuboid tank 9, which is essentially closed on all sides and has a bottom 11 and an upper cover 12 connected to the side walls of the tank 9.
  • a quenching bath container 13 which extends from the bottom 11 to just below the underside of the upper cover 12 and over the gap-shaped area 14 thus formed, freely with the interior of the Tanks 9 can communicate.
  • a further connection between the interior of the quench bath container 13 and the interior of the tank 9 is via a pipeline 14 which opens into the quench bath container 13 at 1.5 just above the floor 11 and has a section 16 that runs vertically upward.
  • a propeller 18 runs in the vertically upward section 16, the mouth 17 of which lies to the interior of the tank 9 a considerable distance below the upper edge of the quench bath container 13 extends vertically upward through the top cover 12.
  • the shaft 19 is the Output shaft of a drive device attached to the top of the cover 12 in the form of an electric motor 20, through which the pro-.
  • Peller 18 can optionally be set in revolutions in each of the two possible directions of rotation, so that, depending on the direction of rotation, the quenching medium flowing through the pipeline 14 can flow up or down in the vertical pipe section 16.
  • the mouth 17 remains submerged in all operating situations.
  • a calibratable bypass connection 21 which is also mounted in the wall of the container 13 near the bottom 11 and the opening width of which is shown by an adjustable slide (not shown) can change.
  • the upper cover 12 contains a filling opening 22 which is aligned with a corresponding area 23 of the quench bath container 13.
  • a slide 24 is mounted, which can be pivoted about a vertical axis 25 (FIG. 3); the storage of the slide 24 so that it is in each of its two end positions, i.e. is inside the tank 9 both when the filling opening is open and when it closes the filling opening 22.
  • the two end positions of the slide 24 are indicated schematically in FIG. 3 by 24 ′ and 24 ′′.
  • FIG. 2 shows the fill opening 22 closed by the slide 24. In FIG. 1, the slide 24 is pivoted away to the side and gives the fill opening 22 completely free.
  • the annealed material 2 is located on or in a workpiece carrier 26, which can be designed as a pallet or basket and can be conveyed by means of a lifting device 27 out of the muffle of the bell furnace 3, which is open at the bottom, into the quench bath container 13 or out of it.
  • the lifting device 27 has a vertically running guide rail 28 which extends vertically upwards from the top of the cover 12.
  • a slide 29 is guided on it in a longitudinally displaceable manner and carries a rod 31 which projects into the interior of the tank 9 through a corresponding opening in the cover 12.
  • a horizontally extending arm 32 is attached, which in turn carries at its free end a stand 33 which is set up at its upper end for receiving the workpiece carrier 26.
  • the slide 29 together with the rod 31 attached to it and the arm 32 and the stand 33 can be moved from the upper position shown in FIG. 1 into the lowered position or illustrated in FIG transfer back, the boom 32 constantly remaining below the cover 12 of the tank 9 due to the dimensions of the lifting device 27.
  • the arm 32 moves vertically through the quench bath container 13, its cross section is adapted to the shape of the arm 32, as can be seen in FIG.
  • a ventilation opening 35 is provided in the tank 9 near its top cover 12, to which a ventilation pipe 36 is provided is connected in order to discharge the vapors generated from the tank 9 in a controlled manner.
  • the bell furnace 3 is loaded from below with the annealing material 2 arranged on the workpiece carrier 26, the workpiece carrier 26 being known and known per se For the sake of clarity, holding devices not shown are held in the interior of the muffle.
  • the bell furnace 3 is moved on the rails 4 and 6 via the device 1.
  • the quenching medium was pumped from the quench bath tank 13 into the tank 9 by starting the drive motor 20 until a level indicated by a broken line 37 is reached in the quench bath tank 13.
  • the level of the quenching medium in the tank 9 rises to a level indicated by a broken line 38.
  • the level 37 is still above the mouth 15, but below the lowered workpiece holder 26. This is achieved through the adjustable bypass opening 21, through which quenching medium can flow back from the tank 9 into the quench bath container 13.
  • the bypass opening 21 is set so that when the level 37 is reached, the amount of quenching medium flowing back through the bypass opening 21 is exactly as large as the amount of quenching medium which can be pumped out of the container 13 by means of the propeller 18 via the pipeline 14.
  • the lifting device 27 When the slide 24 is open, the lifting device 27 is brought into its upper end position, in which the stand 33 engages in the corresponding receiving device of the workpiece carrier 26 and moves it down from its holding devices in the muffle raises.
  • the workpiece carrier 26, together with the annealing material 2 arranged thereon is now lowered into the largely emptied quench bath container 13 until the position shown in FIG. 2 is finally reached.
  • the cold boom 32 is already immersed in the quenching medium in the quench bath container 13;
  • the hot workpiece holder 26 together with the annealing material 2 is still outside or above the water level 37 and it cannot lead to the generation of steam which could escape through the opening 22.
  • the slide 24 is transferred to the closed position in which the filling opening 22 is closed from below. In Fig. 3, this is the position 24 '.
  • the drive motor 21 is reversed, which up to now has constantly driven the propeller 18 in the sense of drawing off quenching medium from the quenching bath tank 13.
  • the propeller runs in pressure mode and accelerates the quenching medium from the tank 9 back into the quenching bath tank 13, so that the quenching medium in the quenching bath tank 13 rises from below and quenched the annealing material from below.
  • the quenching medium overflows into the tank 9 via the upper edge of the quenching bath container 13.
  • the vapors and liquid splashes generated during quenching remain trapped in the tank 9 or flow out in a controlled manner via the ventilation pipe 36. In any case, they cannot get into the interior of the bell furnace via the filling opening 22.
  • the drive motor which caused the propeller 18 to operate in the pressure mode is reversed, so that the propeller 18 now sucks the quenching medium out of the quenching bath container 13 again until the previously described equilibrium state is reached and the quenching medium reaches level 37 reached in the quench bath tank 13.
  • the resulting level 38 in the tank 9 is still below the upper edge of the quench bath container 13, which cannot flow into the quench bath container 13 in this way.
  • This operating phase ensures that the quenched annealing material 2 which is now quenched can still drip inside the quench bath container 13, so that as little quenching medium as possible is dragged along with the cold annealing material 2 when it is lifted out.
  • the slide 24 is first opened again; in FIG. 3 this is the position 24 ": Then the lifting device 27 is started in the sense of lifting the slide 29 until the workpiece carrier 26 together with the cold annealing material 2 emerges from the filling opening 22 and can be removed from the stand 33 .
  • the arrangement described significantly reduces the risk of fire when working with oil quenching baths, since the oil vapors generated during quenching can no longer get into the hot furnace interior when mixed with atmospheric oxygen, where they can ignite under unfavorable circumstances on the inner wall. Rather, the resulting oil vapors are released into the open in a controlled manner via the exhaust line 36, without being able to come together with other hot objects.
  • a final danger which can arise from the contact of oil vapors with the hot quenched parts which have not yet been quenched and at the same time access of atmospheric oxygen, can be prevented by filling the container 13 with protective gas or inert gas after the quenching medium has been lowered to level 37.
  • a pipeline 41 which opens into the quenching container 13 at 42.
  • the mouth 42 lies just above the level 37 in order to displace as much of the atmospheric oxygen as possible from the container 13.
  • the mouth 42 should not be submerged so that no foam is formed when the protective gas is supplied, which adversely affects the quenching process.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (13)

1. Dispositif de trempe brusque pour produits métallurgiques recuits dans un four, comprenant un bac (13) qui, recevant le milieu de trempe, comporte une ouverture, placée au-dessus, pour l'introduction du produit, un réservoir (9) qui est raccordé au bac (13) par une conduite tubulaire (14) ainsi qu'un dispositif de pompage (18, 19, 20) pour pomper le milieu de trempe du bac (13) au réservoir (9), caractérisé par le fait que le dispositif de pompage (18, 19, 20) peut être commuté en régime refoulement au sens d'un remplissage accéléré du bac de trempe (13).
2. Dispositif selon la revendication 1, caractérisé par le fait que le bac de trempe (13) est installé dans le réservoir (9).
3. Dispositif selon la revendication 2, caractérisé par le fait que le réservoir (9), dans son couvercle supérieur (12), comporte une ouverture de chargement (22) située dans l'alignement de l'ouverture de chargement du bac de trempe (13).
4. Dispositif selon la revendication 1 ou 3, caractérisé par le fait qu'à l'ouverture de chargement (22) du bac (13) et/ou du réservoir (9) est associé un obturateur (24) pouvant se déplacer alternativement entre deux positions et pouvant fermer l'ouverture de chargement (22) avant le remplissage du bac de trempe (13), et que le réservoir (9) et/ou le bac (13) comporte une ouverture d'aération (35).
5. Dispositif selon la revendication 1, caractérisé par le fait que la conduite tubulaire (14) débouche dans le bac de trempe (13) en dessous de la limite inférieure du produit recuit (2) introduit dans le bac (13).
6. Dispositif selon la revendication 1, caractérisé par le fait que la conduite tubulaire (14) dans le réservoir (9) comporte une section tubulaire (16) dirigée verticalement vers le haut et dont l'ouverture supérieure (17) se situe en dessous du niveau de fonctionnement le plus bas du milieu de trempe dans le réservoir (9), et que dans la section tubulaire (16), du côté de son ouverture supérieure (17), fait saillie un arbre de sortie (19) d'un dispositif d'entraînement (20) qui porte une hélice (18) et qui, avec l'hélice (18), forme le dispositif de pompage.
7. Dispositif selon la revendication 6, caractérisé par le fait que le dispositif d'entraînement (20) est fixé à l'extérieur du réservoir (9) sur son couvercle supérieur (12) et est formé par un moteur électrique.
8. Dispositif selon la revendication 1, caractérisé par le fait que le réservoir (9) et le bac de trempe (13) communique pour l'écoulement par une dérivation calibrée (21) qui passe le long du dispositif de pompage (18, 19, 21) et qui débouche au moins dans le bac de trempe (13) dans la zone inférieure constamment remplie de celui-ci.
9. Dispositif selon la revendication 1, caractérisé par le fait que la section transversale du bac de trempe (13) est sensiblement adaptée à la section transversale d'un support (26) portant le produit recuit (2).
10. Dispositif selon la revendication 1, caractérisé par le fait que pour abaisser le produit recuit (2) dans le bac de trempe (13) et pour le soulever en dehors du bac de trempe (13), il est prévu un dispositif de levage (27) muni d'une flèche (32) qui porte le produit recuit (2) ou le support (26) et qui peut se déplacer en hauteur au moyen d'un guidage vertical (28, 29, 31).
11. Dispositif selon la revendication 10, caractérisé par le fait que la flèche (32) porte un montant (33) qui fait saillie vers le haut et qui reçoit le produit recuit (2) ou un support (26) portant le produit recuit (2), et que le montant (33) est dimensionné de façon que la flèche (32) reste à l'intérieur du réservoir (9) ou du bac (13), même à la position soulevée, tandis que le montant (33) fait saillie vers le haut par l'ouverture de chargement (22).
12. Dispositif selon la revendication 10, caractérisé par le fait que la section transversale du bac de trempe (13) est adaptée à la section transversale du support (26) ainsi que de la flèche (32) partant de celui-ci.
13. Dispositif selon la revendication 1, caractérisé par le fait que, pour l'introduction de gaz protecteur, au bac (13) est raccordée une conduite (41) dont l'embouchure (42) dans le bac (13) se situe aussi près que possible au-dessus du niveau abaissé (37) du milieu de trempe.
EP86113242A 1985-10-31 1986-09-26 Procédé et installation de trempe de produits recuits Expired EP0221329B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113242T ATE44772T1 (de) 1985-10-31 1986-09-26 Verfahren und vorrichtung zum abschrecken von gluehgut.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3538754 1985-10-31
DE3538754A DE3538754C1 (de) 1985-10-31 1985-10-31 Verfahren und Vorrichtung zum Abschrecken von Gluehgut

Publications (2)

Publication Number Publication Date
EP0221329A1 EP0221329A1 (fr) 1987-05-13
EP0221329B1 true EP0221329B1 (fr) 1989-07-19

Family

ID=6284927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113242A Expired EP0221329B1 (fr) 1985-10-31 1986-09-26 Procédé et installation de trempe de produits recuits

Country Status (3)

Country Link
EP (1) EP0221329B1 (fr)
AT (1) ATE44772T1 (fr)
DE (2) DE3538754C1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4415098C1 (de) * 1994-04-29 1995-09-07 Leybold Durferrit Gmbh Verfahren und Vorrichtung zum Abschrecken von Werkstücken mittels einer wässrigen Polymerlösung
EP2345747A1 (fr) * 2010-01-15 2011-07-20 Linde Aktiengesellschaft Procédé et dispositif pour la reduction du risque d'incendie et la suppression de fumée lors de la trempe en bain d'huile
CN107312914A (zh) * 2017-07-12 2017-11-03 中车大连机车车辆有限公司 新型淬火水槽搅拌装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH475357A (de) * 1966-12-20 1969-07-15 Balzers Patent Beteilig Ag Verfahren zum Abschrecken von Gegenständen, wobei diese zuerst unter Vakuum geglüht und dann in einer Abschreckflüssigkeit einer plötzlichen Temperaturabsenkung unterworfen werden
US3589696A (en) * 1968-03-04 1971-06-29 Hayes Inc C I High vacuum electric furnace with liquid quench apparatus
DE2211286C3 (de) * 1972-03-09 1975-04-24 Fa. J. Aichelin, 7015 Korntal Ofenanlage zur Wärmebehandlung von Stahl und Nichteisenmetallen mit einem unmittelbar unter der Ofenkammer angeordneten Abschreckbad
EP0070347A1 (fr) * 1981-07-17 1983-01-26 Michel Spérisen, Equipements industriels Installation de traitement thermique

Also Published As

Publication number Publication date
ATE44772T1 (de) 1989-08-15
DE3538754C1 (de) 1987-01-29
EP0221329A1 (fr) 1987-05-13
DE3664486D1 (en) 1989-08-24

Similar Documents

Publication Publication Date Title
DE1473137C3 (de) Vorrichtung zum Mischen von flüssigen Medien
DE1508166C2 (de) Verfahren und Vorrichtung zum Fördern von Metallschmelzen, insbesondere Stahlschmelzen
DE1458092A1 (de) Giessvorrichtung,insbesondere fuer Aluminium-Kokillenguss
EP0221329B1 (fr) Procédé et installation de trempe de produits recuits
DE1040747B (de) Automatisch arbeitende Maschine zum Waschen, Fuellen und Zuschmelzen von Ampullen oder aehnlichen Behaeltern
DE2724477B2 (de) Verfahren und Vorrichtung zum Fördern von Flüssigkeit aus einem Behälter durch eine in die Flüssigkeit eintauchende Rohrleitung
EP0343413B1 (fr) Dispositif de nettoyage d'éléments de machines de traitement des matières plastiques sur lesquelles adhèrent des restes de matière plastique
DE1458812A1 (de) Vorrichtung zum Vakuumbehandeln von Schmelzen,insbesondere Stahlschmelzen,und Verfahren zu ihrem Betrieb
DE6807202U (de) Vorrichtung zum aetzen
EP1105234B1 (fr) Procede et dispositif pour le degazage continu de metaux en fusion
DE1583343C3 (fr)
EP1526207A2 (fr) Appareil de teinture sur ensouple
DE2211286B2 (de) Ofenanlage zur Wärmebehandlung von Stahl und Nichteisenmetallen mit einem unmittelbar unter der Ofenkammer angeordneten Abschreckbad
DE351057C (de) Hydraulische Kippvorrichtung fuer Kraftfahrzeuge
DE1579422C3 (de) Friteuse für große Einsatzmengen
DE3137050C2 (de) Entladungsbearbeitungsvorrichtung
DE1930432B2 (de) Entaschungseinrichtung fuer dampfkesselfeuerungen
DE570614C (de) Verfahren und Vorrichtungen zur Herstellung von Gusskoerpern, insbesondere Metallplatten und -bloecken, durch Einsaugen des Schmelzgutes in Kokillen
AT310214B (de) Vorrichtung zur Erzeugung eines Kreislaufes von schmelzflüssigen Metallen, insbesondere zu deren Durchlaufentgasung
DE1458812C (de) Vorrichtung zum kontinuierlichen Vakuumbehandeln von Metallschmelzen, ins besondere Stahlschmelzen, und Verfahren zu ihrem Betrieb
AT201388B (de) Apparat zum Reinigen und Entfetten von Werkstücken
DE2608032A1 (de) Vorrichtung zum entleeren von sammelbehaeltern fuer fluessigkeiten, insbesondere abwaesser
DE605761C (de) Druckloser UEberlaufheisswasserspeicher
DE2113287C3 (de) Absenk· und Transportvorrichtung für einen Mehrstationenvakuumofen zur Wärmebehandlung von metallischen Werkstücken
DE2058669A1 (de) Vakuumbehandlung von Metallschmelzen

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE FR GB IT SE

17P Request for examination filed

Effective date: 19870505

17Q First examination report despatched

Effective date: 19880504

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB IT SE

REF Corresponds to:

Ref document number: 44772

Country of ref document: AT

Date of ref document: 19890815

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

REF Corresponds to:

Ref document number: 3664486

Country of ref document: DE

Date of ref document: 19890824

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
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
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920811

Year of fee payment: 7

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

Ref country code: FR

Payment date: 19920817

Year of fee payment: 7

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

Ref country code: AT

Payment date: 19920824

Year of fee payment: 7

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

Ref country code: SE

Payment date: 19920918

Year of fee payment: 7

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

Ref country code: GB

Effective date: 19930926

Ref country code: AT

Effective date: 19930926

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

Ref country code: SE

Effective date: 19930927

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930926

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

Ref country code: FR

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

Effective date: 19940531

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

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

Ref country code: DE

Payment date: 19941104

Year of fee payment: 9

EUG Se: european patent has lapsed

Ref document number: 86113242.1

Effective date: 19940410

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

Ref country code: DE

Effective date: 19960601

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;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050926