EP0216132B1 - Procédé et appareil pour le chauffage et le refroidissement d'une pièce à usiner - Google Patents

Procédé et appareil pour le chauffage et le refroidissement d'une pièce à usiner Download PDF

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Publication number
EP0216132B1
EP0216132B1 EP86111409A EP86111409A EP0216132B1 EP 0216132 B1 EP0216132 B1 EP 0216132B1 EP 86111409 A EP86111409 A EP 86111409A EP 86111409 A EP86111409 A EP 86111409A EP 0216132 B1 EP0216132 B1 EP 0216132B1
Authority
EP
European Patent Office
Prior art keywords
cooling
separating
burner
fuel
outlet opening
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
EP86111409A
Other languages
German (de)
English (en)
Other versions
EP0216132A1 (fr
Inventor
Klaus Dipl.-Ing. Schuhmacher
Erich Oligschläger
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
Priority to AT86111409T priority Critical patent/ATE55783T1/de
Publication of EP0216132A1 publication Critical patent/EP0216132A1/fr
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Publication of EP0216132B1 publication Critical patent/EP0216132B1/fr
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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames
    • 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
    • C21D1/06—Surface hardening
    • C21D1/08—Surface hardening with flames

Definitions

  • the invention relates to a method for partial heating and subsequent re-cooling of workpieces by burning a fuel over the workpiece and subsequent cooling by supplying a cooling medium to the workpiece, the area of the fuel flame being shielded from the area exposed to the coolant by a separating fluid introduced between these areas , and with a burner device with feed line (s) and outlet opening (s) for fuel and oxygen, as well as a cooling device with associated feed line (s) and outlet opening (s) for a cooling medium and a separation device with associated feed line (s) (10 ) and outlet opening (s) for a separating fluid, the outlet opening (s) of the separating device being arranged in the area between the outlet openings of the burner and those of the cooling device and thus applying separation fluid to this area.
  • Partial heating of workpieces with subsequent cooling takes place, for example, in surface flame hardening or in the zone heating process.
  • a burner operated with fuel gas and oxygen is usually used.
  • a cooling medium usually water, is directed onto the workpiece after the flame front.
  • a cooling medium can obstruct the fuel gas-oxygen flames, so that burner faults and even reignitions can be caused.
  • Slowly burning gases are less sensitive to external disturbances such as the spilling of the cooling medium than, for example, fuel gases such as acetylene.
  • Slowly burning gases create a relatively large heating zone.
  • a large heat zone is disadvantageous, since in many heating processes it is important to specifically heat only small areas of a workpiece.
  • the invention is therefore based on the object of specifying a method of the type mentioned at the outset which enables the smallest possible distance between the area of the fuel flame and the area of the cooling medium.
  • the associated devices namely the burner device, the cooling device and the separating device are combined to form a unit with a common head part, the outlet openings of the individual devices being arranged at such a short distance from one another that the individual exit jets follow one another Leaving the outlet openings touch, but the burner flame and the cooling fluid jets are still shielded from each other by the separating fluid.
  • the area of the fuel flame is therefore protected by a gas which is passed between the flame front and the area of the cooling medium (amorphous barrier).
  • a gaseous separating fluid means that only an extremely small distance between the area of the fuel flame and the area of the cooling medium has to be maintained. This is smaller compared to conventional processes. Nevertheless, the fuel flame is safely protected against exposure to the cooling medium (coolant splash). In this way, the heating zone can be kept very narrow. In contrast to the mechanical lock, there is no physical contact between the workpiece and the torch, so that wedging and handicaps are impossible.
  • Air can be used as the separation fluid.
  • a protective gas as the separating fluid.
  • these gases are, for example, inert gases, especially nitrogen.
  • a varying distance between the torch and the workpiece is compensated for by adapting the separation fluid pressure.
  • workpieces can be machined with greater tolerance.
  • the distance between the workpiece and the torch can fluctuate within relatively wide limits.
  • fuel gases such as acetylene, which burn quickly, can also be used. Since acetylene is a very fast-burning gas that burns with a low scattering flame, the heating zone can be kept extremely narrow according to the invention.
  • a device for carrying out the method according to the invention essentially consists of a unit with supply lines and outlet openings for fuel and oxygen and for a cooling medium. Another is according to the invention Provide supply line for a separation fluid, the outlet openings of which are to be arranged in the region between the outlet openings for fuel and oxygen and those for the cooling medium.
  • the distance between the outlet openings for fuel and oxygen on the one hand and the cooling medium on the other hand can be kept to a minimum.
  • a device for regulating the separation fluid pressure is arranged in the supply line for the separation fluid.
  • the method according to the invention can be used wherever it is important either to reduce the pollution of the flame exit bores or to limit the heat spread of the oxy-fuel flame.
  • the method according to the invention is preferably applied to zone heating of steel pipes to be bent. Pipes lose less stability when bent, the narrower the heating zone. An extremely low ovality is achieved with the method according to the invention.
  • FIG. 1 a device with mechanical separation by a slide 3 is shown schematically.
  • a workpiece 5 is heated by means of a burner head part 4 in a certain zone (partial heating).
  • Fuel and oxygen are fed to an outlet opening 6 and burned via a feed line 1.
  • a cooling medium is fed to the workpiece 5 via a further feed line 2.
  • the cooling medium exits the burner 4 via the outlet opening 7.
  • the area of the fuel flame 12 is separated from the area of the cooling medium 13 with a slide 3.
  • Slider 3 sits on the workpiece surface. This separating device is very susceptible because the torch is easily tilted towards the workpiece. In addition, the thermal load from the flame is high.
  • a mechanical separation by a deflection nose is shown schematically.
  • the cooling medium can run into the flame front.
  • the cooling medium is sucked in by the high flow velocity of the flame gases.
  • FIG. 3 A device according to the invention is shown schematically in FIG. 3 which, in addition to the outlet openings 7 and 6, has a further outlet opening 9 with an associated feed line 10 (separating device).
  • a gaseous separation fluid such as compressed air or an inert gas, e.g. Nitrogen, introduced into the space between the area of the fuel flame 12 and the area of the cooling medium 13, is acetylene, the cooling medium is water.
  • the gaseous separating fluid 11 Through the use of the gaseous separating fluid 11, the area of the fuel flame 12 is shielded reliably against splashes of coolant on the one hand, despite the short distance, while on the other hand the heating zone a is kept very narrow.

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  • 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)
  • Gas Burners (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Claims (3)

1. Procédé pour le chauffage partiel et le refroidissement consécutif de pièces à usiner par combustion d'un combustible au-dessus de la pièce dont on effectue ensuite le refroidissement par amenée d'un agent de refroidissement, procédé dans lequel la zone de la flamme produite par le combustible est séparée de la zone de refroidissement à l'aide d'une fluide de séparation injecté entre ces deux zones, ce procédé consistant à employer un système de brûleurs pourvu de conduite(s) d'amenée (1) et d'orifice(s) de sortie (6) pour le combustible et l'oxygène, un système de refroidissement pourvu de conduite(s) d'amenée (2) et d'orifice(s) de sortie (7) pour un agent de refroidissement ainsi qu'un dispositif de séparation pourvu de conduite(s) d'amenée (10) et d'orifice(s) de sortie (9) pour un fluide de séparation, ce ou ces orifice(s) de sortie (9) du dispositif de séparation est/sont disposé(s) dans la zone disposée entre les orifices de sortie du brûleur et ceux du système de refroidissement (6 et 7) pour projeter ainsi dans cette zone un fluide de séparation, ce procédé étant caractérisé en ce que le système de brûleurs, le système de refroidissement et le dispositif de refroidissement sont regroupés en une seule unité comportant une partie de tête (4) commune et en ce que les orifices de sortie des divers dispositifs (6, 7, 9) sont disposés de façon à présenter une faible distance entre eux, de telle sorte que les différents jets de sortie quittant les orifices de sortie soient d'adjacents, la flamme du brûleur et les jets du fluide de refroidissement étant ainsi séparés ou isolés l'une de l'autre par le fluide de séparation.
2. Procédé selon la revendication 1, caractérisé en ce que, dans la conduite d'amenée (10) au dispositif de séparation, la pression est réglée de manière à compenser des distances variables par rapport à la pièce.
3. Application du procédé au chauffage de zones de tubes d'acier à plier.
EP86111409A 1985-08-26 1986-08-18 Procédé et appareil pour le chauffage et le refroidissement d'une pièce à usiner Expired - Lifetime EP0216132B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111409T ATE55783T1 (de) 1985-08-26 1986-08-18 Verfahren und vorrichtung zum waermen und kuehlen eines werkstueckes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3530435 1985-08-26
DE19853530435 DE3530435A1 (de) 1985-08-26 1985-08-26 Verfahren und vorrichtung zum waermen und kuehlen eines werkstueckes

Publications (2)

Publication Number Publication Date
EP0216132A1 EP0216132A1 (fr) 1987-04-01
EP0216132B1 true EP0216132B1 (fr) 1990-08-22

Family

ID=6279371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111409A Expired - Lifetime EP0216132B1 (fr) 1985-08-26 1986-08-18 Procédé et appareil pour le chauffage et le refroidissement d'une pièce à usiner

Country Status (3)

Country Link
EP (1) EP0216132B1 (fr)
AT (1) ATE55783T1 (fr)
DE (2) DE3530435A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10136196A1 (de) * 2001-07-25 2003-02-06 Koenig & Bauer Ag Verfahren und Einrichtung zum Oberflächenhärten

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE666833A (fr) * 1964-07-13 1965-11-03

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE634807C (de) * 1933-02-22 1936-09-03 Francesco Mangiameli Verfahren zum Abschreckhaerten der Oberflaeche bzw. der inneren Flaeche von zylindrischen Voll- bzw. Hohlkoerpern aus Stahl
DE857838C (de) * 1940-08-13 1952-12-01 Deutsche Edelstahlwerke Ag Heizleiter fuer elektro-induktives Aufheizen von Werkstuecken
US2367969A (en) * 1942-04-09 1945-01-23 Air Reduction Flame hardening
US2482945A (en) * 1946-09-25 1949-09-27 Air Reduction Method of flame hardening

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE666833A (fr) * 1964-07-13 1965-11-03

Also Published As

Publication number Publication date
DE3673590D1 (de) 1990-09-27
DE3530435A1 (de) 1987-02-26
EP0216132A1 (fr) 1987-04-01
ATE55783T1 (de) 1990-09-15

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