EP1809775A2 - Dispositif servant a refroidir des objets oblongs - Google Patents

Dispositif servant a refroidir des objets oblongs

Info

Publication number
EP1809775A2
EP1809775A2 EP05797187A EP05797187A EP1809775A2 EP 1809775 A2 EP1809775 A2 EP 1809775A2 EP 05797187 A EP05797187 A EP 05797187A EP 05797187 A EP05797187 A EP 05797187A EP 1809775 A2 EP1809775 A2 EP 1809775A2
Authority
EP
European Patent Office
Prior art keywords
gas
cooling
diameter
cladding tube
nozzles
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
EP05797187A
Other languages
German (de)
English (en)
Other versions
EP1809775B1 (fr
Inventor
Anders ASTRÖM
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.)
Linde GmbH
Original Assignee
Linde 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 Linde GmbH filed Critical Linde GmbH
Publication of EP1809775A2 publication Critical patent/EP1809775A2/fr
Application granted granted Critical
Publication of EP1809775B1 publication Critical patent/EP1809775B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races

Definitions

  • the invention relates to a device for cooling long objects according to the preamble of claim 1.
  • Long articles are understood to mean wires, tubes, rods, spring steels, plates and similar articles whose
  • Length expansion is much greater than the dimensions in width and / or in height. In making (casting or drawing) such "endless" articles or after the heat treatment, rapid quenching is often required to suitably transform microstructures.
  • the object of the invention is to propose a device with which long or endless objects can be gas-cooled reliably, quickly and economically. This object is achieved by a device with the features of claim 1. Embodiments of the invention are objects of dependent claims.
  • the device according to the invention has two differently dimensioned chambers or regions, wherein in the first chamber (nozzle region) a plurality of nozzles are provided, which blow cold gas jets onto the object to be cooled.
  • the second area (cladding tube) is relatively long and encloses the object to be cooled over a relatively long area.
  • the gap formed between the object to be cooled and the inner wall of the cladding tube flows through the cold gas which has been sprayed from the nozzles towards the object and thus either further cools the article as the article moves or cools it in the direction of the gas when the direction of movement of the object is against the gas direction.
  • the cross section of the cladding tube is adapted to the object to be cooled. If the object is round, the cladding tube is also cylindrical, rectangular in the case of rectangular bars. The cladding closely encloses the article so that the cooling gas is conducted close to the article.
  • the invention may be located on one side of the nozzle portion, a sealing region which rests relatively close to the object to be cooled and prevents refrigerant gas escaping in this direction. This has the advantage that the cooling gas flows only in the preferred direction.
  • the cladding tube has a smaller diameter than the nozzle area.
  • N 2 , H 2 , helium or N 2 H 2 mixtures, N 2 -helium mixtures, H 2 -helium mixtures or ternary mixtures of N 2 , H 2 and helium are advantageous.
  • the dimensions of the objects to be cooled can range from wires of about 1 mm in diameter to tubes of any diameter, that is from a few centimeters to a few meters in diameter.
  • Starting temperatures can be in the range of 400 to 1400 0 C, wherein the starting temperature depends on the alloy and the requirements of quenching.
  • the gas pressures during spraying can be between 0 and 10 bar.
  • the nozzles for discharging the gas jets are preferably oriented so as to blow in the radial direction on the object to be cooled, so that the entire circumference of the object is uniformly applied.
  • the preferred distance between the article to be cooled and the gas-carrying casing is chosen such that the gas velocity in the cladding tube gap is between one and ten meters per second (preferably between 3 and 6 m / s).
  • the direction of the gas can run both with the product direction and against the product direction. If such a plant is connected to a heating furnace or to a device for casting, drawing or producing the metal, this object will always move in one direction. The gas may then flow parallel thereto or in the opposite direction. The gas flow in is preferred
  • the gap between the cooling jacket and the object should not be so small that a considerable back pressure is created and the gas from flowing ⁇ prevents, so that a significant back pressure against the current flowing from the nozzle gas.
  • the gas volume should be controlled so that the gas leaving the unit is not unduly hot.
  • Turbulence generating units can be installed inside the pipe, which destroy the laminar flow, create turbulence and therefore lead to better cooling.
  • Product speed reaches the intended final temperature of the product. This is possible due to greater length if a lower end temperature is desired.
  • the figure shows schematically the object 2 to be cooled, in this case a rod or a tube, within the cooling device according to the invention.
  • the cooling device according to the invention comprises a nozzle region 2 and a cladding tube 6, which adjoins the nozzle region 4, in the nozzle region 4, the nozzles 8 are shown schematically.
  • a sealing region 10 connects, which rests relatively close to the object 2 and prevents leakage of the gas to the left.
  • swirling elements 12 which may also extend over the entire circumference of the cladding tube.
  • the object 2 to be cooled moves either from left to right or from right to left through the device according to the invention.
  • cold gas is blown through the nozzles 8 onto the object 2.
  • the object 2 cools strongly in the nozzle area 4.
  • the gas then flows through the gap between the article 2 and the cladding tube 6 to the right, where it further cools the article 2.
  • Preferred dimensions are:
  • the length of the cladding tube is 2 to 50, preferably 30 to 50 times as large as its diameter, so for example between 0.1 and 1 m.
  • the gaps between the object 2 and the cladding tube 6 are between 5 and 20 mm.
  • the nozzle diameters are eg 1, 2 mm.
  • the length of the nozzle area is a few centimeters to decimeters. For a good heat transfer coefficient, the following should apply:
  • d 0, 1 to 0.2 x H preferably: d 0, 18 H and

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 Strip Materials And Filament Materials (AREA)

Abstract

L'invention concerne un dispositif servant à refroidir des objets oblongs (2), tels que des fils, des tuyaux ou des barres. Pour assurer un meilleur refroidissement, ce dispositif comprend : une zone à ajutages (4) dont le diamètre est supérieur à celui de l'objet (2), et qui comporte une pluralité d'ajutages (8) à travers lesquels un gaz de refroidissement est soufflé sur l'objet (2), et ; un tuyau enveloppant (6) dont le diamètre est inférieur ou égal à celui de la zone à ajutages (4).
EP05797187A 2004-11-11 2005-10-25 Dispositif servant a refroidir des objets oblongs Not-in-force EP1809775B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004054627A DE102004054627A1 (de) 2004-11-11 2004-11-11 Vorrichtung zum Kühlen von langen Gegenständen
PCT/EP2005/011447 WO2006050814A2 (fr) 2004-11-11 2005-10-25 Dispositif servant a refroidir des objets oblongs

Publications (2)

Publication Number Publication Date
EP1809775A2 true EP1809775A2 (fr) 2007-07-25
EP1809775B1 EP1809775B1 (fr) 2009-01-14

Family

ID=35355624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05797187A Not-in-force EP1809775B1 (fr) 2004-11-11 2005-10-25 Dispositif servant a refroidir des objets oblongs

Country Status (7)

Country Link
US (1) US7497984B2 (fr)
EP (1) EP1809775B1 (fr)
AT (1) ATE420979T1 (fr)
BR (1) BRPI0517300B1 (fr)
DE (2) DE102004054627A1 (fr)
ES (1) ES2321120T3 (fr)
WO (1) WO2006050814A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9290823B2 (en) 2010-02-23 2016-03-22 Air Products And Chemicals, Inc. Method of metal processing using cryogenic cooling
EP2933342A1 (fr) * 2014-04-15 2015-10-21 Böhler-Uddeholm Precision Strip GmbH Procédé et dispositif de fabrication d'une feuille d'acier avec une structure bainitique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675908A (en) * 1971-01-04 1972-07-11 Ajax Magnethermic Corp Quenching device
JPS5767134A (en) * 1980-10-09 1982-04-23 Nippon Steel Corp Method and installation for continuous annealing method of cold-rolled steel strip
DE3234863C2 (de) * 1982-09-21 1986-04-10 Messer Griesheim Gmbh, 6000 Frankfurt Verfahren und Vorrichtung zum Blankglühen von metallischen Werkstücken mit Stickstoff als Schutzgas
US6656413B2 (en) * 2001-06-21 2003-12-02 Can-Eng Furnaces Ltd Method and apparatus for quenching metal workpieces
FR2844809B1 (fr) * 2002-09-20 2007-06-29 Air Liquide Procede de refroidissement rapide de pieces par transfert convectif et radiatif

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006050814A3 *

Also Published As

Publication number Publication date
US20070289678A1 (en) 2007-12-20
DE502005006494D1 (de) 2009-03-05
US7497984B2 (en) 2009-03-03
EP1809775B1 (fr) 2009-01-14
DE102004054627A1 (de) 2006-05-18
WO2006050814A3 (fr) 2007-12-13
BRPI0517300B1 (pt) 2014-11-04
ES2321120T3 (es) 2009-06-02
WO2006050814A2 (fr) 2006-05-18
BRPI0517300A (pt) 2008-10-07
ATE420979T1 (de) 2009-01-15

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