EP0129701B1 - Dispositif pour le refroidissement d'une charge, en particulier de pièces métalliques - Google Patents

Dispositif pour le refroidissement d'une charge, en particulier de pièces métalliques Download PDF

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Publication number
EP0129701B1
EP0129701B1 EP84105678A EP84105678A EP0129701B1 EP 0129701 B1 EP0129701 B1 EP 0129701B1 EP 84105678 A EP84105678 A EP 84105678A EP 84105678 A EP84105678 A EP 84105678A EP 0129701 B1 EP0129701 B1 EP 0129701B1
Authority
EP
European Patent Office
Prior art keywords
chamber
cooling
closed
cooling gas
housing
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
EP84105678A
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German (de)
English (en)
Other versions
EP0129701A1 (fr
Inventor
Peter Schmetz
Dieter Gierse
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.)
Schmetz GmbH and Co KG
Original Assignee
Schmetz GmbH and Co KG
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 Schmetz GmbH and Co KG filed Critical Schmetz GmbH and Co KG
Priority to AT84105678T priority Critical patent/ATE31553T1/de
Publication of EP0129701A1 publication Critical patent/EP0129701A1/fr
Application granted granted Critical
Publication of EP0129701B1 publication Critical patent/EP0129701B1/fr
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • 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
    • C21D1/84—Controlled slow cooling
    • 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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B5/16—Arrangements of air or gas supply 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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B5/16—Arrangements of air or gas supply devices
    • F27B2005/161—Gas inflow or outflow
    • F27B2005/162—Gas inflow or outflow through closable or non-closable openings of the chamber walls
    • 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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B5/16—Arrangements of air or gas supply devices
    • F27B2005/166—Means to circulate the atmosphere
    • F27B2005/169—Means to circulate the atmosphere the atmosphere being continuously renewed by exterior means

Definitions

  • the invention relates to a furnace system for cooling a batch, in particular of metallic workpieces, after heat treatment within a closed treatment chamber by blowing with a stream of cooling gas.
  • a furnace for carrying out a heat treatment of workpieces with a closed treatment chamber receiving the workpieces is known.
  • the chamber contains an inlet for introducing a substantially continuous flow of a gas which is active in the heat treatment and a connection for discharging a substantially constant gas flow from the chamber, with circulation devices being used to generate the gas flow.
  • spaces adjacent to the chamber are provided, each with an associated reciprocable piston.
  • At least two pistons can be arranged at right angles to one another. With the aid of these pistons, the gas in the chamber can be moved back and forth in a pulsating manner relative to the workpiece.
  • a suitable gas for carrying out a thermochemical process such as carburization, decarburization, reduction or nitriding is brought into contact with the surface of the workpiece.
  • the invention has for its object to provide a furnace system for cooling a batch after a heat treatment within a closed treatment chamber by blowing with a cooling gas, by means of which the thermal requirements during a cooling process can be better fulfilled than hitherto.
  • the flow of the cooling gas should be controllable within the treatment chamber in such a way that a largely uniform temperature distribution within the batch can be achieved if a desired cooling rate is maintained.
  • an electrical memory in the temperature control system which is used to store the control signals of an initial batch for a programmed control of repeat batches.
  • the advantages that can be achieved with the invention consist essentially in the fact that through the targeted use of the cooling gas flow in the treatment chamber in terms of intensity and / or direction, taking into account the conditions of the batch, cooling is carried out at a predetermined speed and the other largely uniform distribution of the temperature within the batch can be achieved.
  • Uniform temperature distribution means maintaining temperature differences within a specified range.
  • Such a cooling process can be carried out safely both within a treatment chamber in the form of a hollow cylinder and in the form of a hollow cube.
  • the inclusion of a temperature controller system on the basis of target-actual comparisons between the target values of the temperature specification and the measured actual values also offers the advantage of being able to carry out the entire cooling process automatically.
  • a vacuum chamber furnace which essentially consists of a double-walled cylindrical steel housing 1, which has a removable cover 2 on the underside, and a cylindrical treatment chamber located on the inside 3 with an upright cylinder axis and space on all sides to the inner wall of the steel housing 1. Loading takes place from the underside after removal of the cover 2.
  • the cover can just as well be arranged on the top of the steel housing.
  • partition walls 4 and 5 are arranged in the form of annular disks in the vicinity of the upper and lower ends of the treatment chamber. These dividing walls form a lower and an upper space 6 and 7 and a middle space in the intermediate space.
  • the middle room is divided by two partition walls 8 running in a common axial plane into two semicircular rooms 9, 10.
  • control valves for the inlet are designated E and for the outlet of the cooling gas with A, the affiliation to the respective space 6, 7, 9 or 10 being indicated by the additional digit.
  • the control valves are two-way valves that are actuated electromagnetically or in some other way.
  • FIG. 3 shows an oven system with a cubic treatment chamber 3 'inside a cylindrical steel housing 1', which is arranged with a horizontally extending cylinder axis.
  • the cover 2 ', with which the loading opening is closed, is located here on an end face of the steel housing 1'.
  • the steel housing 1 ' is shown on the left in cross section and on the right in longitudinal section.
  • the treatment chamber 3 'in the form of a cube has a length in the diagonals which corresponds approximately to the inside diameter of the cylindrical steel housing 1'.
  • partition walls 16, 17 are arranged in the form of circular sections. A total of six closed rooms are formed by these partition walls 16 and 17, namely a room 18 on the front sides and rooms 20, 21, 22 and 23 on the longitudinal walls of the treatment chamber 3 '.
  • the individual control valves are designated as in the furnace system according to FIG. 1 with the letters E and A with the addition of a number that corresponds to the reference number of the associated room.
  • FIG. 4 In the treatment chamber 3 'provided here in the form of a cube, eight different operating states are possible with regard to the guidance of the cooling gas in the interior of the treatment chamber 3'. These different operating states are shown in FIG. 4 in the same way as in FIG. 3 for the furnace system according to FIG. 1.
  • operating states 5 to 8 gas flows can be set which run in opposite directions perpendicular to the plane of the drawing. This is indicated by crosses or dots.
  • the table at the bottom shows the switching positions of the twelve control valves for all eight operating states.
  • the change in the intensity of the different flows of the cooling gas in the interior of the treatment chamber 3 or 3 ′ can be brought about in a simple manner by regulating the delivery rate of the blower device 14.

Claims (3)

1. Installation de four destinée au refroidissement d'une charge, notamment d'une charge composée de pièces métalliques d'usinage, après un traitement thermique, à l'intérieur d'une chambre de traitement fermée, par insufflation d'un courant gazeux de refroidissement, lequel peut être produit dans la chambre dans différentes directions à l'aide d'un dispositif de soufflante, dans lequel la chambre présente la forme d'un cylindre creux ayant les caractéristiques suivantes :
la chambre (3) est disposée concentriquement avec l'axe du cylindre vertical dans un logement (1) cylindrique fermé avec une chambre intermédiaire universelle,
dans la zone annulaire située entre la chambre (3) et le logement (1) sont disposées à angle droit par rapport aux parois de la chambre (3) et du logement (1) des parois de séparation (4,5,8) d'une part à proximité de l'extrémité supérieure et inférieure de la chambre 3 et d'autre part dans un plan axial entre la paroi de séparation inférieure et supérieure (4, 5) de sorte qu'au-dessus et en dessous de la chambre 3 sont respectivement formées une chambre fermée ou isolée (6, 7) et autour de la chambre 3 deux chambres fermées ou isolées (9,10),
dans les parois de la chambre 3 sont pratiquées plusieurs ouvertures de passage de gaz (11) qui sont soit obturables, soit laissent passer les gaz tout en étant toutefois étanches au rayonnement thermique,
dans la paroi du logement, au niveau de chacune des quatre zones intermédiaires (6, 9 et 10) sont respectivement disposés des raccords de conduite pour l'introduction ou l'évacuation du gaz de refroidissement.
à chaque zone intermédiaire (6, 7, 9 et 10) est respectivement relié un raccord par l'intermédiaire d'une tuyauterie de liaison et d'une soupape de commande sur le côté pression et le deuxième raccordement est relié au côté aspiration du dispositif de soufflante (14) pour le gaz de refroidissement par l'intermédiaire d'une tuyauterie de liaison avec une soupape de commande et un système de régulation de température sur la base de comparaisons de valeurs nominales et de valeurs réelles entre les valeurs nominales prédéterminées et les valeurs réelles mesurées de température servant à l'actionnement des soupapes commande et des éléments d'obturation des orifices de passage de gaz (11).
2. Installation de four destinée au refroidissement d'une charge, notamment d'une charge composée de pièces métalliques d'usinage, après un traitement thermique, à l'intérieur d'une chambre de traitement fermée, par insufflation d'un courant de gaz de refroidissement, lequel peut être produit dans la chambre dans différentes directions à l'aide d'un dispositif de soufflante, dans lequel la chambre présente la forme d'un cube creux, avec les caractéristiques suivantes :
la chambre (3') est située dans un logement cylindrique fermé (1') avec un axe de cylindre horizontal, à distance des parois frontales du logement (1'),
au niveau de chacune des quatre parois s'étendant en direction de l'axe du cylindre du logement (1') de la chambre (3'), à proximité des extrémités des parois, sont agencées les parois de séparation (16, 17) reliant la zone intermédiaire de sorte qu'entre chaque paroi de chambre et la paroi intérieure du logement (1') sont formées des zones (18, 19, 20, 21, 22 et 23) isolées entre elles,
dans les parois de la chambre (3') sont pratiquées plusieurs ouvertures de passage de gaz (11'). lesquelles sont soit obturables, soit laissent passer les gaz tout en empêchant toutefois le rayonnement thermique,
dans la paroi du récipient, au niveau de chacune des six zones intermédiaires (18. 19, 20, 21, 22 et 23), sont agencés respectivement deux raccords de conduite pour l'introduction ou l'évacuation du gaz de refroidissement,
à chaque zone intermédiaire (18, 19, 20, 21. 22 et 23) sont respectivement reliés un raccord par l'intermédiaire d'une tuyauterie de liaison et une soupape de commande sur le côté pression et le deuxième raccordement par l'intermédiaire d'une tuyauterie de liaison et une soupape de commande sur le côté aspiration du dispositif de , soufflante (14) pour le gaz de refroidissement et,
un système de régulation de température sur la base de comparaison de valeurs nominales et de valeurs réelles entre les valeurs nominales prédéterminées et les valeurs réelles de température mesurées pour l'actionnement des soupapes de commande et des éléments d'obturation des orifices de passage de gaz (11').
3. Installation de four selon la revendication 1 ou 2, caractérisée en ce qu'il est prévu une mémoire électrique destinée à mémoriser des signaux de commande d'une première charge pour une commande programmée de charges répétitives.
EP84105678A 1983-06-22 1984-05-18 Dispositif pour le refroidissement d'une charge, en particulier de pièces métalliques Expired EP0129701B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84105678T ATE31553T1 (de) 1983-06-22 1984-05-18 Ofenanlage zur kuehlung einer charge, insbesondere aus metallischen werkstuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3322386 1983-06-22
DE19833322386 DE3322386A1 (de) 1983-06-22 1983-06-22 Verfahren zur kuehlung einer charge nach einer waermebehandlung und ofenanlage zur durchfuehrung des verfahrens

Publications (2)

Publication Number Publication Date
EP0129701A1 EP0129701A1 (fr) 1985-01-02
EP0129701B1 true EP0129701B1 (fr) 1987-12-23

Family

ID=6202034

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105678A Expired EP0129701B1 (fr) 1983-06-22 1984-05-18 Dispositif pour le refroidissement d'une charge, en particulier de pièces métalliques

Country Status (4)

Country Link
US (2) US4634103A (fr)
EP (1) EP0129701B1 (fr)
AT (1) ATE31553T1 (fr)
DE (1) DE3322386A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000201A1 (de) 2009-01-14 2010-07-15 Robert Bosch Gmbh Chargiergestell sowie Abschreckvorrichtung mit Chargiergestell

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US5121903A (en) * 1991-03-11 1992-06-16 Vacuum Furnace Systems Corporation Quenching arrangement for a furnace
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DE4208485C2 (de) * 1992-03-17 1997-09-04 Wuenning Joachim Verfahren und Vorrichtung zum Abschrecken metallischer Werkstücke
US5358030A (en) * 1992-05-08 1994-10-25 Fmc Corporation Method for managing retort over-pressure during pressure cooling
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DE59309658D1 (de) * 1993-04-21 1999-07-22 Ipsen Ind Int Gmbh Flexible adaptive Abschreckung
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US9995481B2 (en) 2011-12-20 2018-06-12 Eclipse, Inc. Method and apparatus for a dual mode burner yielding low NOx emission
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000201A1 (de) 2009-01-14 2010-07-15 Robert Bosch Gmbh Chargiergestell sowie Abschreckvorrichtung mit Chargiergestell
DE102009000201B4 (de) 2009-01-14 2018-06-21 Robert Bosch Gmbh Chargiergestell sowie Abschreckvorrichtung mit Chargiergestell

Also Published As

Publication number Publication date
EP0129701A1 (fr) 1985-01-02
DE3322386A1 (de) 1985-01-10
US4713124A (en) 1987-12-15
US4634103A (en) 1987-01-06
DE3322386C2 (fr) 1991-02-14
ATE31553T1 (de) 1988-01-15

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