EP0312909A1 - Four à chambre à vide - Google Patents

Four à chambre à vide Download PDF

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Publication number
EP0312909A1
EP0312909A1 EP88116992A EP88116992A EP0312909A1 EP 0312909 A1 EP0312909 A1 EP 0312909A1 EP 88116992 A EP88116992 A EP 88116992A EP 88116992 A EP88116992 A EP 88116992A EP 0312909 A1 EP0312909 A1 EP 0312909A1
Authority
EP
European Patent Office
Prior art keywords
gas
workpieces
heating chamber
vacuum chamber
slots
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.)
Granted
Application number
EP88116992A
Other languages
German (de)
English (en)
Other versions
EP0312909B1 (fr
Inventor
Ulrich Wingens
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT88116992T priority Critical patent/ATE67521T1/de
Publication of EP0312909A1 publication Critical patent/EP0312909A1/fr
Application granted granted Critical
Publication of EP0312909B1 publication Critical patent/EP0312909B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C21D1/773—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
    • C21D1/74—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
    • 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
    • F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special 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

Definitions

  • the invention relates to a vacuum chamber furnace for the heat treatment of metallic workpieces, consisting of an essentially cylindrical housing which contains a heating chamber insulated from the housing wall, in the interior of which a support device for receiving the workpieces to be treated is arranged and the walls of which are diametrically opposed to one another with heating elements opposite sides are provided with gas inlet openings in the form of nozzles and gas outlet openings in the form of slots which extend over the axial length of the heating chamber, the gas inlet openings and the gas outlet openings being connected to a gas circulation system which has a blower for the gas circulation and a heat exchanger for the gas cooling .
  • the invention proposes proceeding from a vacuum chamber furnace of the type mentioned above, that the gas inlet openings opposite one another can be acted upon with gas at the same time, that the carrying devices hold the workpieces to be treated in the area in which the gas flows generated by the gas inlet openings collide with one another and that the gas outlet openings are arranged in the wall areas adjacent to this area.
  • the workpieces are cooled from above and below simultaneously and uniformly.
  • the vortices that form in the impact zone of the gas flows directed against one another ensure intensive mixing and swirling of the gases in the area of the workpieces to be treated, so that a largely homogeneous cooling zone is formed.
  • the gas outlet openings in the form of slots arranged laterally next to the impact zone result in a pressure gradient directed from the impact zone to both sides, through which the cooling gas heated on the workpieces flows out laterally.
  • a preferred embodiment of the invention provides that the nozzles forming the gas inlet openings are aligned with the workpieces received by the carrier device. This ensures that the inflowing cooling gas first comes into contact with the workpieces in the impact zone before it flows into the slots serving as gas outlet openings.
  • the slots serving as gas outlet openings in the interior of the heating chamber are of cover plates against radiation heat covered, which are arranged at a distance from the respective opening cross-section of the slots. These cover plates prevent radiation heat from escaping. However, do not hinder the escape of the cooling gas.
  • Control devices can be assigned to the gas circulation system, with which the amount of gas passed through can be controlled. This makes it possible to precisely adapt the amount of gas to the respective need.
  • the heating chamber also expediently has an approximately elliptical cross section, the workpieces being held by the carrying device in the plane in which the longer ellipse axis runs.
  • This design of the heating chamber results in a particularly favorable use of space in the volume of the heating chamber without the cooling uniformity suffering.
  • the substantially cylindrical housing of the vacuum chamber furnace is designated by the reference number 1.
  • This housing 1 is mounted on feet 2 and provided on one end with a tightly closing door 3 (see FIG. 2).
  • the housing 1 is provided with a blower 4 and a heat exchanger 5, which are components of the gas circulation described in more detail below.
  • a heating chamber Arranged in the interior of the housing 1 is a heating chamber which is approximately elliptical in cross section and is thermally insulated from the walls of the housing 1. On the inside of the walls of the heating chamber 6, heating rods 8 are attached by means of suitable holders 7, which extend over the axial length of the heating chamber 6.
  • 6 gas outlet openings in the form of nozzles 9 are provided on the ceiling and on the bottom of the heating chamber, which are simultaneously acted upon by cooling gas via gas supply lines 10 and generate gas flows directed towards the center plane of the heating chamber.
  • the workpieces 11 to be treated are arranged in the interior of the heating chamber and are carried by a suitable carrying device 12, which can be designed, for example, as a grid pallet.
  • a suitable carrying device 12 which can be designed, for example, as a grid pallet.
  • cover plates 14 against radiant heat which are arranged at a distance from the respective opening cross section of the slot 13.
  • the slots 13 serving as gas outlet openings are connected to the suction side of the fan 4 via gas return channels 15 and the heat exchanger 5.
  • the pressure side of the blower 4 is connected to the nozzles 9 via the gas supply lines 10.
  • the gas circulation system consisting of the blower 4, the gas supply lines 5, the nozzles 9, the slots 13, the gas return lines 15 and the heat exchanger 5 is also at suitable locations Provide control and regulation procedures, by means of which the circulated gas quantity can be adapted to the requirements. These control and regulating elements are not shown in the drawing.
  • the workpieces to be treated are arranged where the gas flows generated by the opposing nozzles 9 collide with one another.
  • the gas flows colliding with one another produce a largely homogeneous cooling zone around the workpieces 11 through intensive swirling, which guarantees a uniform cooling of the workpieces 11 on all surfaces that come into contact with the cooling gas.
  • the impact area lies horizontally in the middle of the heating chamber.
  • this impact area can of course also be arranged differently in the interior of the heating chamber 6, for example in the vertical plane. It is only essential that the gas flows generated by the nozzles are directed in opposite directions, that the workpieces to be treated are arranged in the impact area and that the gas discharge openings designed as slots are located in the walls of the heating chamber adjacent to the impact area.
EP88116992A 1987-10-17 1988-10-13 Four à chambre à vide Expired - Lifetime EP0312909B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88116992T ATE67521T1 (de) 1987-10-17 1988-10-13 Vakuum-kammerofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3735186A DE3735186C1 (de) 1987-10-17 1987-10-17 Vakuum-Kammerofen
DE3735186 1987-10-17

Publications (2)

Publication Number Publication Date
EP0312909A1 true EP0312909A1 (fr) 1989-04-26
EP0312909B1 EP0312909B1 (fr) 1991-09-18

Family

ID=6338534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116992A Expired - Lifetime EP0312909B1 (fr) 1987-10-17 1988-10-13 Four à chambre à vide

Country Status (4)

Country Link
US (1) US4909732A (fr)
EP (1) EP0312909B1 (fr)
AT (1) ATE67521T1 (fr)
DE (1) DE3735186C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11971216B1 (en) 2021-12-23 2024-04-30 Rolls-Royce High Temperature Composites, Inc. Retort with loading window

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3818471A1 (de) * 1988-05-31 1989-12-21 Ipsen Ind Int Gmbh Ofen zur waermebehandlung von eisen- und stahlteilen
DE3819803C1 (fr) * 1988-06-10 1989-12-14 Ulrich 5810 Witten De Wingens
DE4014630A1 (de) * 1990-05-08 1991-11-14 Dieter Uschkoreit Industrieofen zur waermebehandlung metallischer werkstuecke
US5391077A (en) * 1993-12-23 1995-02-21 Kerr-Mcgee Corporation Drum oven
US5934871A (en) * 1997-07-24 1999-08-10 Murphy; Donald G. Method and apparatus for supplying a anti-oxidizing gas to and simultaneously cooling a shaft and a fan in a heat treatment chamber

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3565410A (en) * 1968-09-06 1971-02-23 Midland Ross Corp Vacuum furnace
DE2620111A1 (de) * 1975-05-12 1976-11-25 Oliver Machinery Co Vorrichtung zum erhitzen von langgestreckten formstuecken, wie metallbarren
GB2032082A (en) * 1978-09-13 1980-04-30 Degussa A vacuum furnace comprising a gas cooling system
DE3215509A1 (de) * 1982-04-26 1983-10-27 Schmetz Industrieofenbau und Vakuum-Hartlöttechnik KG, 5750 Menden Vakuum-kammerofen
GB2152199A (en) * 1983-12-23 1985-07-31 Ipsen Ind Int Gmbh Industrial furnace
DE3736502C1 (de) * 1987-10-28 1988-06-09 Degussa Vakuumofen zur Waermebehandlung metallischer Werkstuecke

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516012A (en) * 1981-06-22 1985-05-07 G. S. Blodgett Co., Inc. Dual flow heating apparatus
US4490110A (en) * 1983-05-20 1984-12-25 Jones William R Plenum arrangement
US4493641A (en) * 1984-01-09 1985-01-15 Gladd Industries, Inc. Bake oven with manifold
US4560348A (en) * 1984-05-24 1985-12-24 Abar Ipsen Industries Gas nozzle for a heat treating furnace
US4596526A (en) * 1985-03-04 1986-06-24 Worthington Industries, Inc. Batch coil annealing furnace and method
US4789333A (en) * 1987-12-02 1988-12-06 Gas Research Institute Convective heat transfer within an industrial heat treating furnace
US4787844A (en) * 1987-12-02 1988-11-29 Gas Research Institute Seal arrangement for high temperature furnace applications

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3565410A (en) * 1968-09-06 1971-02-23 Midland Ross Corp Vacuum furnace
DE2620111A1 (de) * 1975-05-12 1976-11-25 Oliver Machinery Co Vorrichtung zum erhitzen von langgestreckten formstuecken, wie metallbarren
GB2032082A (en) * 1978-09-13 1980-04-30 Degussa A vacuum furnace comprising a gas cooling system
DE3215509A1 (de) * 1982-04-26 1983-10-27 Schmetz Industrieofenbau und Vakuum-Hartlöttechnik KG, 5750 Menden Vakuum-kammerofen
GB2152199A (en) * 1983-12-23 1985-07-31 Ipsen Ind Int Gmbh Industrial furnace
DE3736502C1 (de) * 1987-10-28 1988-06-09 Degussa Vakuumofen zur Waermebehandlung metallischer Werkstuecke

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11971216B1 (en) 2021-12-23 2024-04-30 Rolls-Royce High Temperature Composites, Inc. Retort with loading window

Also Published As

Publication number Publication date
EP0312909B1 (fr) 1991-09-18
US4909732A (en) 1990-03-20
DE3735186C1 (de) 1988-09-15
ATE67521T1 (de) 1991-10-15

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