EP0216132B1 - Method and apparatus for heating and cooling a work piece - Google Patents

Method and apparatus for heating and cooling a work piece 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
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EP
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Prior art keywords
cooling
separating
burner
fuel
outlet opening
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EP86111409A
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German (de)
French (fr)
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EP0216132A1 (en
Inventor
Klaus Dipl.-Ing. Schuhmacher
Erich Oligschläger
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Linde GmbH
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Linde GmbH
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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
    • C21D1/34—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)

Abstract

1. A process for the partial heating and subsequent recooling of work-pieces by burning a fuel above the work-piece and then, cooling by supplying a cooling medium to the work-piece, where the region of the fuel flame is screened from the zone supplied with coolant by a separating fluid introduced between these zones, with a burner device having supply line(s) (1) and outlet opening(s) (6) for fuel and oxygen, and with a cooling device having associated supply line(s) (2) and outlet opening(s) (7) for a cooling medium and with a separating device with associated supply line(s) (10) and outlet opening(s) (9) for a separating fluid, where the outlet opening(s) (9) of the separating device is/are arranged in the region between the outlet openings of the burner and those of the cooling device (6; 7) and in this way supply this zone with separating fluid, characterised in that the burner device, the cooling device and the separating device are combined to form one unit with a common head component (4), where the outlet openings of the individual devices (6, 7, 9) are arranged at such short distances from one another that the individual outlet jets contact each other when they have emerged from the outlet openings, although the burner flame and the cooling fluid jets are screened from one another by the separating fluid.

Description

Die Erfindung betrifft ein Verfahren zum partiellen Erwärmen und anschließenden Wiederabkühlen von Werkstücken durch Verbrennen eines Brennstoffs über dem Werkstück und anschließende Abkühlung durch Zuleitung eines Kühlmediums auf das Werkstück, wobei der Bereich der Brennstoffflamme vom mit Kühlmittel beaufschlagten Bereich durch ein zwischen diesen Bereichen eingeleitetes Trennfluid abgeschirmt wird, und bei dem mit einer Brennereinrichtung mit Zufuhrleitung(en) und Austrittsöffnung(en) für Brennstoff und Sauerstoff, sowie einer Kühleinrichtung mit zugehörigen Zuleitung(en) und Austrittsöffnung(en) für ein Kühlmedium und einer Trenneinrichtung mit zugehörigen Zuleitung(en) (10) und Austrittsöffnung(en) für ein Trennfluid gearbeitet wird, wobei die Austrittsöffnung(en) der Trenneinrichtung im Bereich zwischen den Austrittsöffnungen des Brenners und denen der Kühleinrichtung angeordnet werden und so diesen Bereich mit Trennfluid beaufschlagen. Ein partielles Wärmen von Werkstücken mit anschließendem Abkühlen erfolgt beispielsweise beim Oberflächen-Flammhärten oder beim Zonen-Wärmeverfahren. Dazu wird üblicherweise ein mit Brenngas und Sauerstoff betriebener Brenner eingesetzt. Zur Begrenzung der örtlichen Erwärmung wird nach der Flammenfront ein Kühlmedium, üblicherweise Wasser, auf das Werkstück geleitet. Durch den Einsatz eines Kühlmediums können jedoch die Brenngas-Sauerstoff-Flammen behindert werden, so daß Brennerstörungen und sogar Rückzündungen verursacht werden können.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. For this purpose, a burner operated with fuel gas and oxygen is usually used. To limit local heating, a cooling medium, usually water, is directed onto the workpiece after the flame front. However, the use of a cooling medium can obstruct the fuel gas-oxygen flames, so that burner faults and even reignitions can be caused.

Gegen äußere Störungen wie das Überschwappen des Kühlmediums sind langsam verbrennende Gase weniger empfindlich als beispielsweise Brenngase wie Acetylen. Langsam verbrennende Gase bewirken jedoch eine relativ große Wärmezone. Eine große Wärmezone ist jedoch von Nachteil, da es bei vielen Wärmeverfahren darauf ankommt, nur kleine Bereiche eines Werkstückes gezielt zu erwärmen.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, however, create a relatively large heating zone. However, a large heat zone is disadvantageous, since in many heating processes it is important to specifically heat only small areas of a workpiece.

Es ist auch bekannt, den Bereich der Brennstoff-Flammen vom Bereich des Kühlmediums durch Leitbleche, Trennwände oder Abweisnasen abzuschirmen. Die maßliche Abstimmung, d.h. der Abstand zwischen der mechanischen Sperre und dem Werkstück muß dabei innerhalb der Toleranzgrenzen gehalten werden. Die mechanische Trennung reicht normalerweise jedoch nicht aus, da der Abstand zwischen Werkstück und Brenner aufgrund von Maßschwankungen der Werkstücke nicht - wie erforderlich - konstant gehalten werden kann. Außerdem kann eine mechanische Trennung eine Relativbewegung zwischen Werkstück und Brenner behindern. Bei der Verwendung einer mechanischen Sperre muß zudem ebenfalls eine unerwünscht große Erwärmungszone in Kauf genommen werden.It is also known to shield the area of the fuel flames from the area of the cooling medium by baffles, partitions or deflection noses. The dimensional coordination, i.e. the distance between the mechanical lock and the workpiece must be kept within the tolerance limits. The mechanical separation is usually not sufficient, however, because the distance between the workpiece and the torch cannot be kept constant as required due to dimensional fluctuations in the workpiece. Mechanical separation can also hinder relative movement between the workpiece and the torch. When using a mechanical lock, an undesirably large heating zone must also be accepted.

Es ist weiterhin bekannt, einen großen Abstand zwischen Flammenfront und dem Bereich des Kühlmediums einzuhalten, wobei bei bestimmten Anwendungen, beispielsweise beim Einsatz eines brennbaren Kühlmediums, darüber hinaus vorgeschlagen wurde, zusätzlich zwischen Brenner und Abschreckbrause Inertgas einzudüsen (DE-PS 1 091 140). Auch bei dieser Verfahrensweise resultiert eine sehr breite Erwärmungszone.It is also known to maintain a large distance between the flame front and the area of the cooling medium, and in certain applications, for example when using a combustible cooling medium, it has also been proposed to additionally inject inert gas between the burner and the quenching shower (DE-PS 1 091 140). This procedure also results in a very wide heating zone.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art anzugeben, das einen möglichst geringen Abstand zwischen dem Bereich der Brennstoff-Flamme und dem Bereich des Kühlmediums ermöglicht.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.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die zugehörigen Einrichtungen, nämlich die Brennereinrichtung, die Kühleinrichtung und die Trenneinrichtung zu einer Einheit mit gemeinsamem Kopfteil zusammengefaßt werden, wobei die Austrittsöffnungen der einzelnen Einrichtungen mit derart geringem Abstand zueinander angeordnet werden, daß sich die einzelnen Austrittsstrahlen nach Verlassen der Austrittsöffnungen berühren, aber die Brennerflamme und die Kühlfluidstrahlen trotzdem durch das Trennfluid voneinander abgeschirmt werden.This object is achieved in that 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.

Es wird also der Bereich der Brennstoff-Flamme durch ein Gas, das zwischen die Flammenfront und den Bereich des Kühlmediums geleitet wird, geschützt (amorphe Sperre). Es hat sich erfindungsgemäß gezeigt, daß durch den Einsatz eines gasförmigen Trennfluids ein nur äußerst geringer Abstand zwischen dem Bereich der Brennstoff-Flamme und dem Bereich des Kühlmediums eingehalten werden muß. Dieser ist im Vergleich zu herkömmlichen Verfahren kleiner. Dennoch wird die Brennstoff-Flamme sicher vor einer Einwirkung des Kühlmediums (Kühlmittelspritzer) geschützt. Auf diese Weise kann die Erwärmungszone sehr schmal gehalten werden. Im Gegensatz zur mechanischen Sperre besteht kein körperlicher Kontakt zwischen Werkstück und Brenner, so daß ein Verkeilen und Behindem ausgeschlossen ist.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). It has been shown according to the invention that the use of 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.

Als Trennfluid kann Luft verwendet werden. Soll jedoch bei einer Wärmebehandlung eines Werkstückes der Einfluß von Sauerstoff aus der Umgebung möglichst ausgeschlossen werden, so ist die Verwendung eines Schutzgases als Trennfluid angezeigt. Dies sind beispielsweise inerte Gase, insbesondere Stickstoff.Air can be used as the separation fluid. However, if the influence of oxygen from the environment is to be excluded as far as possible during heat treatment of a workpiece, the use of a protective gas as the separating fluid is indicated. These are, for example, inert gases, especially nitrogen.

Nach einer weiteren Ausgestaltung der Erfindung ist es vorteilhaft, wenn ein variierender Abstand zwischen dem Brenner und dem Werkstück durch Anpassen des Trennfluiddruckes ausgeglichen wird. Auf diese Weise können Werkstücke mit größerer Toleranz bearbeitet werden. Der Abstand zwischen Werkstück und Brenner kann innerhalb relativ weiter Grenzen schwanken.According to a further embodiment of the invention, it is advantageous if a varying distance between the torch and the workpiece is compensated for by adapting the separation fluid pressure. In this way, workpieces can be machined with greater tolerance. The distance between the workpiece and the torch can fluctuate within relatively wide limits.

Da durch das erfindungsgemäße Verfahren Störungen von der Brennstoff-Flamme ferngehalten werden, können auch Brenngase wie Acetylen, die schnell verbrennen, eingesetzt werden. Da Acetylen ein sehr schnell verbrennendes Gas ist, das mit geringer Streuflamme verbrennt, kann erfindungsgemäß die Erwärmungszone äußerst schmal gehalten werden.Since disturbances are kept away from the fuel flame by the method according to the invention, 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.

Eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens besteht im wesentlichen aus einer Einheit mit Zufuhrleitungen und Austrittsöffnungen für Brennstoff und Sauerstoff sowie für ein Kühlmedium. Erfindungsgemäß ist eine weitere Zufuhrleitung für ein Trennfluid vorzusehen, deren Austrittsöffnungen im Bereich zwischen den Austrittsöffnungen für Brennstoff und Sauerstoff und denen für das Kühlmedium anzuordnen sind.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.

Durch den Einsatz eines gasförmigen Trennfluids kann der Abstand der Austrittsöffnungen für Brennstoff und Sauerstoff einerseits und das Kühlmedium andererseits minimal gehalten werden.By using a gaseous separating fluid, 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.

In einer bevorzugten Ausgestaltung ist in der Zufuhrleitung für das Trennfluid eine Vorrichtung zur Regelung des Trennfluiddruckes angeordnet.In a preferred embodiment, a device for regulating the separation fluid pressure is arranged in the supply line for the separation fluid.

Grundsätzlich kann das erfindungsgemäße Verfahren überall dort eingesetzt werden, wo es entweder auf die Verminderung der Verschmutzung der Flammenaustrittsbohrungen oder auf die Begrenzung der Wärmeausbreitung der Autogen-Flamme ankommt. Bevorzugt wird das erfindungsgemäße Verfahren jedoch auf das Zonenerwärmen von zu biegenden Stahlrohren angewendet. Rohre verlieren beim Biegen umso weniger an Stabilität, je schmaler die Erwärmungszone ist. Mit dem erfindungsgemäßen Verfahren wird eine äußerst geringe Ovalität erzielt.In principle, 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. However, 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.

Im folgenden soll anhand schematischer Skizzen ein Ausführungsbeispiel der Erfindung sowie der Stand der Technik geschildert werden. In den Figuren sind gleiche Teile mit denselben Bezugsziffern versehen.An exemplary embodiment of the invention and the prior art are to be described below with the aid of schematic sketches. In the figures, the same parts are provided with the same reference numbers.

Es zeigen:

  • Figur 1 eine Vorrichtung mit einer mechanischen Trennung zwischen dem Bereich der Brennstoff- Flamme und dem des Kühlmediums,
  • Figur 2 eine weitere Vorrichtung mit mechanischer Trennung,
  • Figur 3 eine erfindungsgemäße Vorrichtung zum Abschirmen des Bereiches der Brennstoff-Flamme vom Bereich des Kühlmediums mittels eines gasförmigen Trennfluids.
Show it:
  • 1 shows a device with a mechanical separation between the area of the fuel flame and that of the cooling medium,
  • FIG. 2 shows another device with mechanical separation,
  • Figure 3 shows an inventive device for shielding the area of the fuel flame from the area of the cooling medium by means of a gaseous separation fluid.

Die in den Figuren 1 und 2 dargestellten Vorrichtungen zählen zum bekannten Stand der Technik.The devices shown in Figures 1 and 2 belong to the known prior art.

In Figur 1 ist eine Vorrichtung mit mechanischer Trennung durch einen Schieber 3 schematisch dargestellt. Ein Werkstück 5 wird mittels eines Brenner-Kopfteils 4 in einer bestimmten Zone erwärmt (partielles Erwärmen). Über eine Zufuhrleitung 1 werden Brennstoff und Sauerstoff zu einer Austrittsöffnung 6 geleitet und verbrannt. Über eine weitere Zufuhrleitung 2 wird ein Kühlmedium zum Werkstück 5 geleitet. Das Kühlmedium tritt über Austrittsöffnung 7 aus dem Brenner 4 aus. Der Bereich der Brennstoff-Flamme 12 wird mit einem Schieber 3 vom Bereich des Kühlmediums 13 abgetrennt. Schieber 3 sitzt auf der Werkstückoberfläche auf. Diese Trennvorrichtung ist sehr anfällig, da der Brenner leicht gegenüber dem Werkstück verkantet. Zudem ist die thermische Belastung durch die Flamme hoch.In Figure 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.

In Figur 2 ist eine mechanische Trennung durch eine Abweisnase schematisch dargestellt. Abhängig von der Werkstücktoleranz kann das Kühlmedium in die Flammenfront laufen. Zum Teil wird das Kühlmedium durch die hohe Strömungsgeschwindigkeit der Flammengase angesaugt.In Figure 2, a mechanical separation by a deflection nose is shown schematically. Depending on the workpiece tolerance, the cooling medium can run into the flame front. In part, the cooling medium is sucked in by the high flow velocity of the flame gases.

Die beiden in den Figuren 1 und 2 dargestellten. Vorrichtungen haben den Nachteil gemeinsam, daß die Erwärmungszone a sehr breit ist.The two shown in Figures 1 and 2. Devices have the disadvantage in common that the heating zone a is very wide.

In Figur 3 ist eine erfindungsgemäße Vorrichtung schematisch dargestellt, die zusätzlich zu den Austrittsöffnungen 7 und 6 eine weitere Austrittsöffnung 9 mit zugehöriger Zuleitung 10 besitzt (Trenneinrichtung). Über die Zuleitung 10 wird ein gasförmiges Trennfluid wie Druckluft oder ein inertes Gas, z.B. Stickstoff, in den Raum zwischen den Bereich der Brennstoffflamme 12 und dem Bereich des Kühlmediums 13 eingeleitet Brennstoff ist Acetylen, Kühlmedium ist Wasser. Durch den Einsatz des gasförmigen Trennfluids 11 wird einerseits - trotz geringem Abstand - der Bereich der Brenn--stoff-Flamme 12 sicher gegen Kühlmediumspritzer abgeschirmt, während andererseits die Erwärmungszone a sehr schmal gehalten wird.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. 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.

Claims (3)

1. A process for the partial heating and subsequent recooling of work-pieces by burning a fuel above the work-piece and then, cooling by supplying a cooling medium to the work-piece, where the region of the fuel flame is screened from the zone supplied with coolant by a separating fluid introduced between these zones,
with a burner device having supply line(s) (1) and outlet opening(s) (6) for fuel and oxygen, and with a cooling device having associated supply line(s) (2) and outlet opening(s) (7) for a cooling medium and with a separating device with associated supply line(s) (10) and outlet opening(s) (9) for a separating fluid,
where the outlet opening(s) (9) of the separating device is/are arranged in the region between the outlet openings of the burner and those of the cooling device (6; 7) and in this way supply this zone with separating fluid, characterised in that the burner device, the cooling device and the separating device are combined to form one unit with a common head component (4), where the outlet openings of the individual devices (6, 7, 9) are arranged at such short distances from one another that the individual outlet jets contact each other when they have emerged from the outlet openings, although the burner flame and the cooling fluid jets are screened from one another by the separating fluid.
2. A process as claimed in Claim 1, characterised in that in the supply line (10) to the separating device, the separating fluid pressure is regulated in such manner that varying distances to the work-piece are compensated.
3. Application of the process to the zone heating of steel pipes which are to be bent.
EP86111409A 1985-08-26 1986-08-18 Method and apparatus for heating and cooling a work piece Expired - Lifetime EP0216132B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111409T ATE55783T1 (en) 1985-08-26 1986-08-18 METHOD AND DEVICE FOR HEATING AND COOLING A WORKPIECE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3530435 1985-08-26
DE19853530435 DE3530435A1 (en) 1985-08-26 1985-08-26 METHOD AND DEVICE FOR HEATING AND COOLING A WORKPIECE

Publications (2)

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EP0216132A1 EP0216132A1 (en) 1987-04-01
EP0216132B1 true EP0216132B1 (en) 1990-08-22

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EP86111409A Expired - Lifetime EP0216132B1 (en) 1985-08-26 1986-08-18 Method and apparatus for heating and cooling a work piece

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EP (1) EP0216132B1 (en)
AT (1) ATE55783T1 (en)
DE (2) DE3530435A1 (en)

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Publication number Priority date Publication date Assignee Title
DE10136196A1 (en) * 2001-07-25 2003-02-06 Koenig & Bauer Ag Process for surface hardening steel workpieces used for radial cams comprises heating workpiece using gas-oxygen flame in the region of the surface, cooling using an oil emulsion after heating, and blowing air through flame and oil emulsion

Citations (1)

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

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
DE634807C (en) * 1933-02-22 1936-09-03 Francesco Mangiameli Process for the quenching of the surface or the inner surface of cylindrical solid or hollow bodies made of steel
DE857838C (en) * 1940-08-13 1952-12-01 Deutsche Edelstahlwerke Ag Heating conductor for electro-inductive heating of workpieces
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 (en) * 1964-07-13 1965-11-03

Also Published As

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ATE55783T1 (en) 1990-09-15
DE3673590D1 (en) 1990-09-27
EP0216132A1 (en) 1987-04-01
DE3530435A1 (en) 1987-02-26

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