EP0609492A1 - Support pour le traitement thermique partiel d'articles - Google Patents

Support pour le traitement thermique partiel d'articles Download PDF

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Publication number
EP0609492A1
EP0609492A1 EP93114885A EP93114885A EP0609492A1 EP 0609492 A1 EP0609492 A1 EP 0609492A1 EP 93114885 A EP93114885 A EP 93114885A EP 93114885 A EP93114885 A EP 93114885A EP 0609492 A1 EP0609492 A1 EP 0609492A1
Authority
EP
European Patent Office
Prior art keywords
holder according
base plate
radiation
radiation shield
lower layers
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
EP93114885A
Other languages
German (de)
English (en)
Other versions
EP0609492B1 (fr
Inventor
Wolfgang Peter
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
Application filed by Ipsen International GmbH filed Critical Ipsen International GmbH
Publication of EP0609492A1 publication Critical patent/EP0609492A1/fr
Application granted granted Critical
Publication of EP0609492B1 publication Critical patent/EP0609492B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0025—Supports; Baskets; Containers; Covers
    • 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
    • F27D5/00—Supports, screens, or the like for the charge within the furnace
    • F27D5/005—Supports specially adapted for holding elongated articles in an upright position, e.g. sparking plugs
    • 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
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/01—End parts (e.g. leading, trailing end)

Definitions

  • the invention relates to a holder for partial heat treatment of tools having a clamping area and a work area, in particular drills, in furnaces, in particular vacuum chamber furnaces with pressurized gas quenching, the tools standing up on a base plate being guided by a perforated base plate and the base plate toward the furnace chamber with a radiation shield is provided.
  • a receptacle for heat treatment tools is known, which is provided on the side facing the furnace chamber with a radiation shield.
  • the base plate which is provided with holes for receiving the tools, is equipped with an insulating plate towards the furnace chamber, which is intended to reduce the heat transfer to the base plate.
  • a radiation screen is applied to the insulating plate, which has a low heat emission value, ie reflects the heat radiation.
  • the invention has for its object to provide a holder for partial heat treatment of tools in ovens, which allows a transition zone on the workpiece as small as possible and leads the workpieces sufficiently in the base plate while maintaining good thermal insulation.
  • the surface of the radiation screen has a high emission factor for heat radiation and that the radiation screen is arranged directly on the base plate.
  • the radiation shield is constructed in multiple layers in such a way that an uppermost layer facing the furnace chamber has the highest possible emission factor for thermal radiation, and the lower layers have the lowest possible emission factor for thermal radiation.
  • the lower layers having a low heat emission factor reflect the incident heat radiation, so that the base plate is optimally insulated from the furnace chamber by the different emission or reflection factors of the individual layers of the radiation shield.
  • the surface of the radiation shield facing the furnace chamber has a heat emission factor of 0.8 to 1.0, preferably 0.9.
  • Polished metal surfaces, graphite or carbon fiber reinforced graphite (CFC), for example, have proven to be suitable materials for the surface of the radiation shield facing the furnace chamber.
  • the layer thickness of the surface of the radiation shield is preferably between 0.5 and 2.5 mm. This small layer thickness of the surface of the radiation shield limits the amount of energy to be absorbed. The minimum thickness is limited by the mechanical properties of the materials, since these have to be resistant to the mechanical forces in the gas flow in the cooling phase.
  • graphite and CFC in particular have proven themselves due to their long service life.
  • graphite and CFC are characterized by low abrasion, which prevents contamination of the furnace interior with detached particles.
  • the heat emission factors of the lower layers of the multilayer radiation shield are preferably between 0.03 and 0.3.
  • thin metal sheets or metal foils with a layer thickness of 0.03 to 0.5 mm are used for the lower layers of the radiation shield. Since the lower layers consist of very thin sheets or foils, it is all the more important that the top layer has a high resistance to the gas flow, since this layer also serves as a protective layer for the thin lower layers.
  • insulating gaps or insulating layers can be arranged between the individual layers. While the insulating layers consist of ceramic, for example, the insulating gaps are simple distances between the layers, which are created, for example, by a wavy application of the individual layers to one another.
  • the material of the individual layers of the radiation shield is to be selected so that this material has a saturation vapor pressure which is lower than the working pressure of the furnace, since vapor deposits on the surfaces of the layers can have a severe impact on their emission or reflection properties.
  • the individual layers can consist of different materials.
  • a different material for each layer it is possible to use the emission or reflection properties of different materials at a desired location.
  • Nickel and nickel alloys such as, for example, have been used as materials Chromium-nickel and copper-nickel alloys (Monel) have proven to be suitable because they have a low saturation vapor pressure and a low heat emission factor.
  • the radiation shield consists of an upper layer and three lower layers.
  • the design with a three-layer underlayer has proven to be sufficient if the materials are well coordinated with one another with their emission and reflection factors.
  • Such a combination of materials results, for example, from the use of layers of nickel, copper and aluminum.
  • the base plate is largely shielded from heat radiation by the three-layer underlayer, which means that the workpieces only have a short transition zone, since the radiation shield consists of only a few and, in addition, very thin layers.
  • the hole dimension of the radiation shield for receiving the workpieces has a larger diameter than the hole dimension of the base plate.
  • the base plate arranged under the base plate is arranged to be adjustable in height in order to workpieces of different lengths to be able to set the transition zone between the hardened work area and the unhardened clamping area at the desired location.
  • furnace chamber 1 shows a furnace chamber 1 of a vacuum chamber furnace, which is provided with insulation 2 on the outside and is heated on the inside via heating elements 3.
  • a holder 4 for receiving workpieces 5 which are to be subjected to a partial heat treatment in the furnace chamber 1.
  • the holder 4 for receiving the workpieces 5 consists of a base frame 6, a base plate 7 and a base plate 9 provided with holes 8.
  • the workpieces 5 are inserted into the holder 4 in such a way that they have a clamping area 10 on the base plate 7 which is not to be hardened rising from the bore 8 of the base plate 9 and project into the heatable furnace chamber 1 with their work area 11 to be hardened.
  • the base plate 9 In order to isolate the base plate 9 from the furnace chamber 1, the base plate 9 has a radiation shield 12 on the side facing the furnace chamber 1, the surface 13 of which is thus obtained is that it first absorbs the incident heat radiation and then emits it back to the furnace chamber 1, which enables a homogeneous temperature distribution in the furnace chamber 1.
  • FIG. 2 shows an enlarged cross section through the base plate 9 with a radiation screen 12 arranged thereon.
  • the radiation screen is constructed in multiple layers. Under the layer 14 with the surface 13 having the large heat emission factor, three further layers 15 are arranged, each with a very small heat emission factor.
  • the individual layers 15 are separated from one another by insulating gaps 16, which are produced by wavy laying of the layers 15. In this case, the individual layers 15 lie on one another only at individual contact points 17, so that no heat conduction can take place between the individual layers 15.
  • fastening elements 18 are provided which connect the radiation shield 12 to the base plate 9.
  • the heating elements 3 heat the furnace chamber 1 to the operating temperature of approximately 1,200 °.
  • the base plate 9 of the holder 4, which guides the workpiece 5 does not heat up too much, so that the base plate 9 guided clamping area 10 is not heated up to the transition temperature.
  • the base plate 9 is provided on the furnace chamber side with a radiation screen 12. The radiation screen 12 prevents excessive heating of the base plate 9 and thus the clamping area 10 of the workpiece 5 guided in the base plate 9.
  • the base plate 7 is arranged in the base frame 6 of the holder 4 so as to be adjustable in height.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP93114885A 1993-01-30 1993-09-16 Support pour le traitement thermique partiel d'articles Expired - Lifetime EP0609492B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9301293U 1993-01-30
DE9301293U DE9301293U1 (de) 1993-01-30 1993-01-30 Halterung zur partiellen Wärmebehandlung von Werkzeugen

Publications (2)

Publication Number Publication Date
EP0609492A1 true EP0609492A1 (fr) 1994-08-10
EP0609492B1 EP0609492B1 (fr) 1998-08-26

Family

ID=6888792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93114885A Expired - Lifetime EP0609492B1 (fr) 1993-01-30 1993-09-16 Support pour le traitement thermique partiel d'articles

Country Status (4)

Country Link
US (1) US5417567A (fr)
EP (1) EP0609492B1 (fr)
AT (1) ATE170227T1 (fr)
DE (2) DE9301293U1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19747257C2 (de) * 1997-10-25 2001-04-26 Geesthacht Gkss Forschung Vorrichtung zur Kapselung von Rohlingen aus metallischen Hochtemperatur-Legierungen
WO2003012158A1 (fr) * 2001-08-03 2003-02-13 Mcgill University Procede ameliore de durcissement par vieillissement d'un superalliage
DE10356679A1 (de) 2003-11-28 2005-07-21 Rolls-Royce Deutschland Ltd & Co Kg Verfahren und Vorrichtung zur Beschichtung oder Wärmebehandlung von BLISK-Scheiben für Fluggasturbinen
CN1322148C (zh) * 2004-12-16 2007-06-20 上海汽车股份有限公司 高压气体淬火料架
US9097463B2 (en) * 2010-02-23 2015-08-04 Ngk Insulators, Ltd. Housing for heating and use method of the same, heating jig and use method of the same, and operation method of heating device
JP6500873B2 (ja) * 2016-10-21 2019-04-17 トヨタ自動車株式会社 真空断熱構造体

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3558113A (en) * 1968-01-05 1971-01-26 Schwarzkopf Dev Co Radiation shields for furnaces
GB1471430A (en) * 1974-11-14 1977-04-27 Kortvelyessy L High-temperature heat insulation shield
GB2095383A (en) * 1981-03-21 1982-09-29 Ipsen Ind Int Gmbh Heat-treatment furnace
EP0422353A2 (fr) * 1989-10-12 1991-04-17 Ipsen Industries International Gesellschaft Mit Beschränkter Haftung Four pour le traitement thermique partiel d'outils

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE390759B (sv) * 1975-05-27 1977-01-17 Asea Ab Cylinderformad langstreckt ugn for behandling av material vid hog temperatur i en gasatmosfer under hogt tryck
SE426663B (sv) * 1979-12-05 1983-02-07 Asea Ab Vertikal ugn for isostatisk varmpressning med vermeisolering
US4512737A (en) * 1983-05-23 1985-04-23 Vacuum Furnace Systems Corporation Hot zone arrangement for use in a vacuum furnace
JPH04227470A (ja) * 1990-06-05 1992-08-17 Arthur Pfeiffer Vakuumtech Wetzlar Gmbh 熱処理装置における閉塞装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3558113A (en) * 1968-01-05 1971-01-26 Schwarzkopf Dev Co Radiation shields for furnaces
GB1471430A (en) * 1974-11-14 1977-04-27 Kortvelyessy L High-temperature heat insulation shield
GB2095383A (en) * 1981-03-21 1982-09-29 Ipsen Ind Int Gmbh Heat-treatment furnace
EP0422353A2 (fr) * 1989-10-12 1991-04-17 Ipsen Industries International Gesellschaft Mit Beschränkter Haftung Four pour le traitement thermique partiel d'outils
DE3934103A1 (de) * 1989-10-12 1991-04-25 Ipsen Ind Int Gmbh Ofen zur partiellen waermebehandlung von werkzeugen

Also Published As

Publication number Publication date
DE59308929D1 (de) 1998-10-01
ATE170227T1 (de) 1998-09-15
DE9301293U1 (de) 1993-03-11
EP0609492B1 (fr) 1998-08-26
US5417567A (en) 1995-05-23

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