US3820766A - Vacuum furnace - Google Patents

Vacuum furnace Download PDF

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Publication number
US3820766A
US3820766A US00229903A US22990372A US3820766A US 3820766 A US3820766 A US 3820766A US 00229903 A US00229903 A US 00229903A US 22990372 A US22990372 A US 22990372A US 3820766 A US3820766 A US 3820766A
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US
United States
Prior art keywords
chamber
heating chamber
chilling
chambers
vacuum furnace
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
Application number
US00229903A
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English (en)
Inventor
F Limque
H Bertrand
I Bielefeldt
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.)
Ipsen International GmbH
Original Assignee
Ipsen International GmbH
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
Priority claimed from DE19712109507 external-priority patent/DE2109507C3/de
Application filed by Ipsen International GmbH filed Critical Ipsen International GmbH
Application granted granted Critical
Publication of US3820766A publication Critical patent/US3820766A/en
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

Definitions

  • Dost Attorney, Agent, or Firm-Walter Becker 57 ABSTRACT A vacuum furnace having an oil quenching chamber 'on one side and a gas chilling chamber on the other side of a heating chamber, while gate means are respectively interposed between the heating chamber and each of the two other chambers for selectively interrupting or permitting communication of the heating chamber with either one of the other two chambers, each of the three chambers being adapted selectively and individually to be evacuated.
  • the present invention relates to a vacuum furnace for heat treating operations which comprises a heating chamber adapted to be evacuated and a quenching or chilling chamber which is connected to the heating chamber by means of a door opening adapted to be closed in an air-tight manner.
  • Vacuum furnaces for the heat treatment of metallic objects for instance bright hardening, annealing, sintering, brazing or stress-free annealing, are known in various forms. Such furnaces are respectively provided with a device by means of which the objects heated in the heating chamber can be quenched or chilled by inert gas or oil 'at given temperature changing speeds. In the simplest instance, cold gas flows around the objects, the charge, in the heating chamber which gas is circulated through the heating chamber after a bottom or ceiling door or gate has been opened. The heating chamber is located within an evacuated pressure container.
  • the heretofore known vacuum furnaces equipped with an oil quenching or chilling device have an oil bath arranged within a common pressure container adjacent to or below the heating chamber. After the expiration of the heating period, the charge is lowered into the oil bath by means of a conveying device.
  • an object of the present invention to provide a vacuum furnace of the above mentioned general character which will make it possible to heat the heating chamber in a continuous manner and which will permit a more flexible treating process.
  • the vacuum furnace according to the present invention for heat treatment operations having a heating chamber adapted to be evacuated and a quenching or chilling chamber adapted to be connected to the heating chamber through a door opening which is adapted to be closed in an air-tight manner is characterized primarily in that the heating chamber is on two sides respectively connectable to a chilling or quenching chamber adapted to be evacuated and to be separated in an air-tight manner from the heating chamber, while one of the two chilling or quenching chambers is formed as an oil chilling chamber whereas the other one of the two chambers is formed as a gas chilling chamber.
  • each of the two chambers is adapted to be operated independently of the other chamber.
  • the oil quenching chamber, the heating chamber and the gas chilling chamber are, in conformity with a further feature of the invention, arranged horizontally one behind the other.
  • the vacuum furnace has a heating chamber 1 which is arranged in the central portion of the furnace and which has arranged on two opposite sides thereof a gas chilling chamber 2 and an oil quenching chamber 3 respectively. All three chambers 1, 2 and 3 communicate with each other through vacuum conduits 5 with vacuum pumps 4, valves not shown in detail being provided which make it possible that all three chambers 1, 2 and 3 can be evacuated independently of each other.
  • the oil quenching chamber 3, the heating chamber l and the gas chilling chamber 2 are arranged horizontally one behind the other. so that the gas chilling chamber 2 and the oil quenching chamber 3 can be charged from the side.
  • a conveyor carriage 7 is provided which is movable on rails 6.
  • the separation of the gas chilling chamber 2 or oil quenching chamber 3 from the heating chamber 1 is respectively effected by a lock gate 8 which is adapted by means of a lifting cylinder-piston system 9 to be pulled upwardly from its position shown in the drawing. in closed position, the lock gate 8 will by means of the elbow lever shown in the drawing be able to bring about an air pressure tight separation between the chambers 2 and 3 and the heating chamber 1.
  • the heating chamber 1 comprises a parallelepiped shaped insulating housing 11 which at both end faces is equipped with upwardly displaceable heating chamber doors 12 adapted to be actuated by a lifting cylinder-piston system 16.
  • a heating chamber 11 Within the insulating housing 11 there is provided a plurality of heating elements 13 which preferably are heated electrically and which are adapted to heat the charges resting on supporting rails 15. In order not to affect the clarity of the drawing, no charges have been shown which charges customarily are contained in so-called charging baskets.
  • the heating chamber 1 which consists primarily of the insulating housing 11 is located in a cylindrical pressure container 14 which at the end faces may be sealed relative to the above referred to lock gates 8.
  • Thegas chilling chamber 2 primarily comprises a pressure container 21 having a gas inlet 36 and provided with a front door 22 which is adapted to be closed in an air-tight manner.
  • a conveying device 23 by means of which a non-illustrated charging basket can be moved into the heating chamber 1 or out of the latter when the lock gate 8 and the heating chamber door 12 are open.
  • the gas chilling chamber 2 is provided with a non-illustrated gas conduit and with heat exchanging means likewise not illustrated which are intended for the inert gas adapted to be blown into the gas chilling chamber 2 for cooling the same.
  • the inert gas is adapted additionally to be circulated by means of a fan 24.
  • the oil quenching chamber 3 is equipped with a pressure container 31 having a gas inlet 36 and adapted to be closed by a front door 32. Below the container 31 there is furthermore arranged an oil container 33 the oil content of which is adapted to be circulated by an oil circulating device 34.
  • a conveying device 35 in the oil quenching chamber 3 makes it possible, in contrast to the conveying device 23 of the gas chilling chamber 2, to charge and discharge heating chamber 1 not only horizontally but also permits a vertical lowering of charging baskets into the oil container 33 for quenching the charge.
  • the heating chamber 1 By means of the above described vacuum furnace a continuous operation of the heating chamber 1 is possible when the charges are transported through the vacuum furnace in one direction. If, for instance, it is intended to carry out a quenching in oil, the heating chamber 1 is charged through the gasquenching chamber 2 which in such an instance acts merely as a lock. In this way the charge heated in the heating chamber 1 can be transported into the oil quenching chamber 3 in which it can be quenched while at the same time the heating chamber 1 is filled or charged from the gas chilling chamber 2. Inversely, also a continuous opera tion is possible when charging the heating chamber 1 from the oil quenching chamber 3 acting as lock in which instance the quenching is effected in the gas chilling chamber 2 which is cooled by blowing in inert gas.
  • the chilling or quenching in the chamber 2 may be effected slowly at a vacuum or may be accelerated by blowing in inert gas in which instance the inert gas is cooled to a desired extent by the heat exchangers in the chamber 2 and, if desired, may be circulated by the fan 24. In this way there is obtained the possibility of varying the intensity of the gas chilling.
  • the vacuum furnace according to the present invention will over heretofore known vacuum furnace types permit a considerably shorter charging sequence while at the same time allowing a continuous operation of the heating chamber.
  • This is due to the fact that through the quenching or chilling chambers adapted to be operated as locks and respectively arranged on both sides of the heating chamber it is possible during the quenching or chilling of a charge in one of the quenching or chilling chambers to move the next charge through the other quenching or chilling chamber into the heating chamber. If it is desired, for instance, to quench or chill the charges in the gas chilling chamber, the vacuum furnace is charged through the oil quenching chamber which under these circumstances is employed merely as lock.
  • the vacuum furnace according to the invention makes it also possible to quench or chill the heated chargesselectively by oil or gas while an alternating operation is possible.
  • a compact vacuum furnace is obtained which with a high output and relatively low energy costs makes possible different treatment methods.
  • a vacuum furnace for heat treating operations which includes: a heating chamber, two chilling chambers respectively arranged on opposite sides of said heating chamber for selective communication with each other, one of said chilling chambers being a gas chilling chamber and the other one of said chilling chambers being an oil quenching chamber, evacuating means operatively connectable to any one of said chambers for selectively evacuating the same, and gate means interposed between said heating chamber and said chilling chambers and operable selectively to interrupt and permit communication of said heating chamber with either one and with both of said chilling chambers.
  • a vacuum furnace in which said oil quenching chamber and said heating chamber and said gas chilling chamber are arranged horizontally one behind the other.
  • a vacuum furnace which includes charging means respectively associated with said oil quenching chamber and said gas chilling chamber and selectively movable into said heating chamber.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Tunnel Furnaces (AREA)
  • Furnace Details (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US00229903A 1971-03-01 1972-02-28 Vacuum furnace Expired - Lifetime US3820766A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712109507 DE2109507C3 (de) 1971-03-01 Vakuumofen

Publications (1)

Publication Number Publication Date
US3820766A true US3820766A (en) 1974-06-28

Family

ID=5800095

Family Applications (1)

Application Number Title Priority Date Filing Date
US00229903A Expired - Lifetime US3820766A (en) 1971-03-01 1972-02-28 Vacuum furnace

Country Status (7)

Country Link
US (1) US3820766A (it)
DD (1) DD96258A5 (it)
ES (1) ES400166A1 (it)
FR (1) FR2128409B1 (it)
GB (1) GB1328041A (it)
IT (1) IT948001B (it)
SE (1) SE375797B (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643401A (en) * 1985-08-28 1987-02-17 Mg Industries Apparatus for cooling a vacuum furnace
CN100497665C (zh) * 2006-05-08 2009-06-10 杭州金舟电炉有限公司 一种真空室软密封装置
CN103898293A (zh) * 2013-12-25 2014-07-02 吴江亿泰真空设备科技有限公司 一种防腐抽真空机排污干式净化的监控操作真空炉
US20230219156A1 (en) * 2019-11-15 2023-07-13 General Electric Company Braze joints for a component and methods of forming the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7639482U1 (de) * 1976-12-17 1977-03-24 Ipsen Industries International Gmbh, 4190 Kleve Schutzgas-anlassofen mit vakuumspuelung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1590606A (it) * 1968-05-29 1970-04-20

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4643401A (en) * 1985-08-28 1987-02-17 Mg Industries Apparatus for cooling a vacuum furnace
CN100497665C (zh) * 2006-05-08 2009-06-10 杭州金舟电炉有限公司 一种真空室软密封装置
CN103898293A (zh) * 2013-12-25 2014-07-02 吴江亿泰真空设备科技有限公司 一种防腐抽真空机排污干式净化的监控操作真空炉
US20230219156A1 (en) * 2019-11-15 2023-07-13 General Electric Company Braze joints for a component and methods of forming the same

Also Published As

Publication number Publication date
DD96258A5 (it) 1973-03-12
SE375797B (it) 1975-04-28
FR2128409A1 (it) 1972-10-20
DE2109507A1 (de) 1972-09-21
IT948001B (it) 1973-05-30
ES400166A1 (es) 1974-12-16
FR2128409B1 (it) 1976-07-09
DE2109507B2 (de) 1973-06-14
GB1328041A (en) 1973-08-22

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