WO1991003576A1 - Process and device for the intermediate heating of a forged piece - Google Patents

Process and device for the intermediate heating of a forged piece Download PDF

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Publication number
WO1991003576A1
WO1991003576A1 PCT/EP1990/001449 EP9001449W WO9103576A1 WO 1991003576 A1 WO1991003576 A1 WO 1991003576A1 EP 9001449 W EP9001449 W EP 9001449W WO 9103576 A1 WO9103576 A1 WO 9103576A1
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WO
WIPO (PCT)
Prior art keywords
intermediate heating
forging
manipulator
furnace
press
Prior art date
Application number
PCT/EP1990/001449
Other languages
German (de)
French (fr)
Inventor
Timothy Thexton
Original Assignee
Aga Ab
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 Aga Ab filed Critical Aga Ab
Publication of WO1991003576A1 publication Critical patent/WO1991003576A1/en

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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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J17/00—Forge furnaces

Definitions

  • the invention relates to a method and an arrangement for intermediate heating of a forging held in the forging press or in the hammer by a manipulator.
  • the workpieces are brought to the processing temperature in the deep furnace, pusher furnace or forging furnace.
  • the temperature inside the workpiece is retained due to the deformation work; however, the temperature of exposed external areas can drop so far that they are at risk of cracking. Intermediate heating is therefore necessary.
  • the forgings are transported back to the pusher furnace or forging furnace according to previous practice. Since these furnaces are large and heavy systems that are operated continuously and are usually not in the immediate vicinity of the forging presses or hammers, transport is necessary, which is both important Means of transport and the transport time is expensive and gives rise to heat loss and scaling. Only in the handicraft business when treating small workpieces can the forging hammer and the forging furnace be provided at such a short distance from one another that these disadvantages are negligible.
  • the invention relates O 91/03576 PCT / EP90 / 01449
  • the invention is based on the object of creating a method and an arrangement for the intermediate heating of large forgings held by a manipulator, which is less complex and lossy.
  • the solution according to the invention consists of two groups of features.
  • the first group of features relates to the fact that the forging remains in the manipulator during intermediate heating and transport, which holds it in the forging press or hammer. This eliminates the need to move the forgings and the need to use separate transport systems. This also has an impact on the construction costs of the intermediate heating furnace, since it does not have any heavy equipment to carry and, if necessary, Moving the forging is required. Rather, the workpiece is held in the intermediate heating furnace by the manipulator and even moved, if necessary, for the purpose of uniform heat distribution, for example rotated.
  • the second group of features relates to the intermediate heating furnace, which, thanks to the manipulator's continued holding of the forging, can be constructed very easily and practically only needs to consist of a burner suitably arranged in a battery. Not even an oven housing is required, although generally useful.
  • This allows the intermediate heating furnace to be arranged in the immediate vicinity of the press or hammer. It can also be designed to be mobile so that it can be used at different locations as required. Its light design also makes it possible to adapt its burner arrangement to the respective requirements, for example the forging receptacle
  • the level of invention is based on the one hand on the interlocking of the two different groups of features. Thanks to the continuous holding of the forging in the manipulator, the intermediate heating furnace can be made so light and adaptable that it can be arranged in the immediate vicinity of the press or hammer. Thanks to this lightweight construction, it is possible to provide it in addition to the otherwise available, stationary and continuously operated deep-forging and forging furnaces as well as possibly in larger numbers and to operate it discontinuously.
  • the amount of invention is based on thermal and thermal considerations.
  • the enormous energy requirement of the furnaces required in connection with the forging operation makes it necessary to operate them as economically as possible and to pay particular attention to the possibility of heat recovery (for example by recuperation, combustion air preheating, etc.).
  • they must be constructed in such a way that the workpieces find uniform temperature and heat transfer conditions on all sides so that they reach the required uniform temperature.
  • These two principles which have been regarded as indispensable by the prior art, are disregarded by the invention.
  • Neither a light, discontinuously switchable furnace can be operated economically by heat recovery.
  • the burners arranged around the workpiece receiving space at a short distance from the workpiece can still guarantee uniform heat transfer and temperature conditions. Rather, it must be expected that higher temperature and higher gas velocities with correspondingly higher heat transfer rates will prevail further outside, in closer proximity to the burners, than in areas of the workpiece receiving space located further inside.
  • the invention has surprisingly recognized that, contrary to the principles that have been valid up to now, the invention has considerable advantages.
  • the heat losses can be considerably reduced by eliminating longer transport times between the press or hammer and pusher furnace.
  • the scale losses are correspondingly lower.
  • the energy used during the operation of the intermediate heating furnace according to the invention is not as economical as in a pusher furnace; however, this disadvantage is due, on the one hand, to the avoidance of the transport heat losses, on the other hand to the strict concentration of the use of energy on the discontinuous intermediate heating periods and finally to the concentration of the pusher furnace operation on the initially continuously predictable heating of the forgings far balanced.
  • the unequal temperature and heat transfer ratios over the diameter of the forging piece holder of the intermediate heating furnace to be used according to the invention are to be regarded as an advantage, contrary to previous assumptions.
  • the supposed disadvantage of the furnace to be used according to the invention thus turns out to be an advantage because the heat emission conditions in the forging press or hammer are essentially inversely represented as heat absorption conditions in the furnace. It also makes it possible to work with higher burner temperatures than are permitted in a pusher furnace.
  • the invention is particularly suitable for forgings of compact cross-sectional shape, i.e. a cross-sectional shape whose dimensions measured in different directions do not differ significantly from one another.
  • Fig. 1 shows a longitudinal section through an intermediate heating furnace
  • Fig. 2 is an end view of the furnace.
  • the furnace housing 1 is closed on the circumference and on one end side and forms an opening 2 on the other end side, which leads to the forging-receiving space 3, the circumference of which is predefined by gas burners 4, which are preferably uniformly distributed and which are expediently External mixing burner is concerned, the flames 5 of which are directed onto the surface 6 of the forging 7, while this is held in the receptacle 3 by the magnetic pulley 8 and rotated for the purpose of more uniform heat distribution.
  • the burner arrangement and thus the dimension and shape of the forging receiving space can be changed as desired and in particular adapted to different forging shapes.
  • a closed housing can often be dispensed with.
  • the burners 4 can be adjusted, for example, in the direction of the arrow 9 to adapt to different diameters of the forging.
  • the forging 7 to be heated is brought to the intermediate heating furnace by means of the manipulator 8 and inserted approximately centrally in its forging-receiving space 3. Shortly before or after, the burners 4 are switched on. The workpiece is heated and removed again. The burners are switched off.

Abstract

Process and device for the intermediate heating of a forged piece (7) obtained in the press forge or under the hammer by a manipulator (8). To reduce transport times, heat losses and scaling, a light intermediate heating furnace (1) is provided near the press which has a gas burner (4) arranged around a workpiece receiving chamber (3) designed for brief burner operation. The forged piece (7) can, if necessary, be quickly taken to the intermediate heating furnace (1) in which it is held by the manipulator (8), and if necessary, rotated to achieve even heat distribution.

Description

Verfahren und Anordnung zum Zwischenwärmen eines Schmiedestücks Method and arrangement for intermediate heating of a forging
Die Erf indung betrifft ein Verfahren und eine Anordnung zum Zwischenwär¬ men eines in der Schmiedepresse oder im Hammer durch einen Manipulator gehaltenen Schmiedestücks.The invention relates to a method and an arrangement for intermediate heating of a forging held in the forging press or in the hammer by a manipulator.
Vor der Bearbeitung werden die Werkstücke im Tiefofen, Stoßofen oder Schmiedeofen auf d ie Bearbeitungstemperatur gebracht . Während der Bear ¬ beitung bleibt zwar d ie Temperatur im I nneren des Werkstücks aufgrund der Formänderungsarbeit erhalten; jedoch kann die Temperat ur exponierter Außenbereiche so weit absinken, daß diese von Rißbildung bedroht sind . Es ist deshalb Zwischenerwärmung erforderlich .Before processing, the workpieces are brought to the processing temperature in the deep furnace, pusher furnace or forging furnace. During processing, the temperature inside the workpiece is retained due to the deformation work; however, the temperature of exposed external areas can drop so far that they are at risk of cracking. Intermediate heating is therefore necessary.
Zur Zwischenerwärmung werden die Schmiedestücke nach bisheriger Praxis zum Stoßofen oder Schmiedeofen zurücktransport iert . Da es sich bei d iesen Öfen um große und schwere Anlagen handelt, die kont inuierlich bet rieben werden und in der Regel nicht in unmittelbarer Nähe der Schmiedepressen bzw. -hä mer vorhanden sind, ist ein Transport notwend ig, der sowohl hinsicht l ich der Transportmittel als auch der Transportzeit aufwend ig ist und Anlaß zu Wärmeverlust und Verzunderung gibt . Nur im Handwerksbe¬ t rieb bei der Behandlung kleiner Werkstücke können der Schmiedehammer und der Schmiedeofen in so geringer Entfernung voneinander vorgesehen werden, daß diese Nachteile nicht ins Gewicht fallen . Die Erfindung bezieht O 91/03576 PCT/EP90/01449For intermediate heating, the forgings are transported back to the pusher furnace or forging furnace according to previous practice. Since these furnaces are large and heavy systems that are operated continuously and are usually not in the immediate vicinity of the forging presses or hammers, transport is necessary, which is both important Means of transport and the transport time is expensive and gives rise to heat loss and scaling. Only in the handicraft business when treating small workpieces can the forging hammer and the forging furnace be provided at such a short distance from one another that these disadvantages are negligible. The invention relates O 91/03576 PCT / EP90 / 01449
- 2 -- 2 -
sich jedoch auf die Behandlung solcher Schmiedestücke, d ie mittels eines Manipulators in der Presse bzw. im Hammer gehalten sind und die also bet rächt l iche Größe aufweisen .However, the treatment of such forgings, which are held in the press or hammer by means of a manipulator and which are therefore of considerable size.
Der Erf indung l iegt die Aufgabe zugrunde, ein Verfahren und eine Anord ¬ nung zum Zwischenerwärmen großer, von einem Manipulator gehaltener Schmiedestücke zu schaffen, das weniger aufwendig und verlustreich ist .The invention is based on the object of creating a method and an arrangement for the intermediate heating of large forgings held by a manipulator, which is less complex and lossy.
Die erf indungsgemäße Lösung besteht nach dem Kennzeichen des Patentan ¬ spruchs aus zwei Merkmalsgruppen .According to the characterizing part of the patent claim, the solution according to the invention consists of two groups of features.
Die erste Merkmalsgruppe bezieht sich darauf , daß das Schmiedestück während des Zwischenwärmens und des Transports im Manipulator bleibt, der es in der Schmiedepresse bzw. im Hammer hält . Dadurch entfällt das Umsetzen des Schmiedestücks und die Notwendigkeit der Inanspruchnahme gesonderter Transportanlagen . Ferner hat dies Auswirkungen auf den Bauaufwand des Zwischenwärmofens, da dieser keine schweren Einrich ¬ tungen zum Tragen und ggf . Bewegen des Schmiedestücks benöt igt . Viel¬ mehr wird das Werkstück auch im Zwischenwärmofen vom Manipulator gehal ¬ ten und sogar nöt igenfalls zwecks gleichmäßiger Wärmeverteilung bewegt, beispielsweise gedreht .The first group of features relates to the fact that the forging remains in the manipulator during intermediate heating and transport, which holds it in the forging press or hammer. This eliminates the need to move the forgings and the need to use separate transport systems. This also has an impact on the construction costs of the intermediate heating furnace, since it does not have any heavy equipment to carry and, if necessary, Moving the forging is required. Rather, the workpiece is held in the intermediate heating furnace by the manipulator and even moved, if necessary, for the purpose of uniform heat distribution, for example rotated.
Die zweite Merkmαlsgruppe bezieht sich auf den Zwischenwärmeofen, der dank der fortdauernden Halterung des Schmiedestücks durch den Manipula¬ tor sehr leicht aufgebaut sein kann und prakt isch lediglich aus einer Batte¬ rie geeignet angeordneter Brenner zu bestehen braucht . Nicht einmal ein Ofengehäuse ist erforderlich, wenn auch im allgemeinen zweckmäßig . Dies gestattet es, den Zwischenwärmofen in unmittelbarer Nähe der Presse bzw. des Hammers anzuordnen. Er kann auch mobil ausgestaltet sein, um nach Bedarf an unterschiedlicher Stelle eingesezt werden zu können . Seine leichte Bauart macht es auch möglich, seine Brenneranordnung dem jewei - l igen Bedarf anzupassen, beispielsweise den Schmiedestück-Auf nahmeraumThe second group of features relates to the intermediate heating furnace, which, thanks to the manipulator's continued holding of the forging, can be constructed very easily and practically only needs to consist of a burner suitably arranged in a battery. Not even an oven housing is required, although generally useful. This allows the intermediate heating furnace to be arranged in the immediate vicinity of the press or hammer. It can also be designed to be mobile so that it can be used at different locations as required. Its light design also makes it possible to adapt its burner arrangement to the respective requirements, for example the forging receptacle
(also d ie den Umfang dieses Raums best immende Brenneranordnung ) einem durch das Werkstück vorgegebenen Durchmesser oder einer Werkstück länge anzupassen . Seine leichte Bauweise bringt es ferner mit sich, daß er nur geringe Wärmekapazität aufweist und daher für kurzfrist igen Betrieb geeig¬ net ist . Anders als die bislang zum Zwischenwärmen verwendeten Tief - und Schmiedeöfen ist er nicht für Dauerbetrieb vorgesehen; vielmehr wird er für jeden einzelnen Zwischenwärmvorgang erneut eingeschaltet und danach wieder abgeschaltet.(in other words, the burner arrangement that determines the circumference of this space) to a diameter or a workpiece length specified by the workpiece. Its light construction also means that it has only a small heat capacity and is therefore suitable for short-term operation. In contrast to the low and low temperatures previously used for intermediate heating Forging furnaces are not intended for continuous operation; rather, it is switched on again for each individual intermediate heating process and then switched off again.
Die Erfindungshöhe beruht zum einen auf der Verzahnung der beiden unterschiedlichen Merkmalsgruppen. Dank der fortdauernden Halterung des Schmiedestücks im Manipulator kann der Zwischenwärmofen so leicht und anpassungsfähig ausgebildet werden, daß er in unmittelbarer N he der Presse bzw. des Hammers angeordnet werden kann. Dank diesem leichten Aufbau ist es möglich, ihn neben den sonst vorhandenen, stationär und kontinuierlich betriebenen Tief- und Schmiedeöfen sowie ggf. in größerer Zahl vorzusehen und diskontinuierlich zu betreiben.The level of invention is based on the one hand on the interlocking of the two different groups of features. Thanks to the continuous holding of the forging in the manipulator, the intermediate heating furnace can be made so light and adaptable that it can be arranged in the immediate vicinity of the press or hammer. Thanks to this lightweight construction, it is possible to provide it in addition to the otherwise available, stationary and continuously operated deep-forging and forging furnaces as well as possibly in larger numbers and to operate it discontinuously.
Zum anderen beruht die Erfindungshöhe auf wärmetechnischen und wärme- wirtschαftlichen Überlegungen. Der enorme Energiebedarf der im Zusammen¬ hang mit dem Schmiedebetrieb notwendigen Öfen macht es erforderlich, sie so wärmewirtschaftlich wie möglich zu betreiben und insbesondere auf die Möglichkeit der Wärmerückgewinnung (beispielsweise durch Rekuperαt ion, Verbrennungsluftvorwärmung etc. ) zu achten. Ferner müssen sie so gebaut sein, daß die Werkstücke möglichst allseitig gleichmäßige Temperatur- und Wärmeübergangsbedingungen vorfinden, damit sie auf die erforderliche, gleichmäßige Temperatur kommen. Diese beiden Grundsätze, die von der bisherigen Technik als unabdingbar angesehen werden, werden von der Erfindung mißachtet. Weder läßt sich ein leichter, diskontinuierlich schalt - barer Ofen durch Wärmerückgewinnung wirtschaftlich betreiben. Noch können die rings um den Werkstückaufnahmeraum in geringem Abstand vom Werkstück angeordneten Brenner gleichmäßige Wärmeübergangs- und Tempe¬ raturverhältnisse garantieren. Vielmehr muß damit gerechnet werden, daß weiter außen, in größerer Nähe zu den Brennern, höhere Temperatur und höhere Gasgeschwindigkeiten mit entsprechend höheren Wärmeübergangs¬ zahlen herrschen als in weiter innen liegenden Bereichen des Werkstückauf¬ nahmeraums.On the other hand, the amount of invention is based on thermal and thermal considerations. The enormous energy requirement of the furnaces required in connection with the forging operation makes it necessary to operate them as economically as possible and to pay particular attention to the possibility of heat recovery (for example by recuperation, combustion air preheating, etc.). Furthermore, they must be constructed in such a way that the workpieces find uniform temperature and heat transfer conditions on all sides so that they reach the required uniform temperature. These two principles, which have been regarded as indispensable by the prior art, are disregarded by the invention. Neither a light, discontinuously switchable furnace can be operated economically by heat recovery. The burners arranged around the workpiece receiving space at a short distance from the workpiece can still guarantee uniform heat transfer and temperature conditions. Rather, it must be expected that higher temperature and higher gas velocities with correspondingly higher heat transfer rates will prevail further outside, in closer proximity to the burners, than in areas of the workpiece receiving space located further inside.
Jedoch hat die Erfindung überraschenderweise erkannt, daß die Erfindung entgegen den bisher gültigen Grundsätzen beträchtliche Vorteile mit sich bringt. Die Wärmeverluste können durch Wegfall längerer Trαnsportzeiten zwischen Presse bzw. Hammer und Stoßofen beträchtlich reduziert werden. Entsprechend geringer werden auch die Zunderverluste. Zwar erfolgt der Energieeinsatz während des Betriebs des erfindungsgemäßen Zwischenwärm- ofens nicht so wirtschaftlich wie in einem Stoßofen; jedoch ist dieser Nach¬ teil zum einen durch die Vermeidung der Transport -Wärmeverluste, zum anderen durch die strikte Konzentration des Energieeinsatzes auf die dis¬ kontinuierlichen Zwischenwärmperioden und schließlich durch die Konzentra¬ tion des Stoßofenbetriebs auf die besser kontinuierlich planbare, anfängliche Aufwärmung der Schmiedestücke bei weitem ausgeglichen.However, the invention has surprisingly recognized that, contrary to the principles that have been valid up to now, the invention has considerable advantages. The heat losses can be considerably reduced by eliminating longer transport times between the press or hammer and pusher furnace. The scale losses are correspondingly lower. The energy used during the operation of the intermediate heating furnace according to the invention is not as economical as in a pusher furnace; however, this disadvantage is due, on the one hand, to the avoidance of the transport heat losses, on the other hand to the strict concentration of the use of energy on the discontinuous intermediate heating periods and finally to the concentration of the pusher furnace operation on the initially continuously predictable heating of the forgings far balanced.
Was die Wärmeübertragung angeht, so sind die ungleichen Temperatur- und Wärmeübergangsverhältnisse über den Durchmesser des Schmiedestück-Auf - nαhmerαums des erfindungsgemäß zu verwendenden Zwischenwärmofens entgegen bisheriger Vermutung als Vorteil zu werten. Anders als bei der erstmaligen Aufwärmung des Schmiedestücks geht es nicht darum, möglichst gleichmäßige Temperαturverhältnisse überall zu schaffen, sondern diejenigen Bereiche des Schmiedestücks, die wegen besonders exponierter Lage stärker abgekühlt sind, stärker aufzuheizen. Diese stärker exponierten Bereiche des Schmiedestücks befinden sich weiter außen und somit in demjenigen Bereich, in welchem höhere Temperaturen und höhere Wärmeübergangszahlen zu erwarten sind. Der vermeintliche Nachteil des erfindungsgemäß zu ver¬ wendenden Ofens entpuppt sich damit als Vorteil, weil die Wärmeabgabebe¬ dingungen in der Schmiedepresse bzw. im Hammer im wesentlichen invers als Wärmeaufnahmebedingungen im Ofen abgebildet werden. Auch ist es dadurch möglich, mit höheren Brennertemperaturen zu arbeiten, als sie in einem Stoßofen zulässig sind.As far as heat transfer is concerned, the unequal temperature and heat transfer ratios over the diameter of the forging piece holder of the intermediate heating furnace to be used according to the invention are to be regarded as an advantage, contrary to previous assumptions. In contrast to the initial warming up of the forging, it is not a question of creating as uniform a temperature as possible everywhere, but rather of heating up those areas of the forging that have cooled more due to the particularly exposed position. These more exposed areas of the forging are located further outside and therefore in the area in which higher temperatures and higher heat transfer coefficients can be expected. The supposed disadvantage of the furnace to be used according to the invention thus turns out to be an advantage because the heat emission conditions in the forging press or hammer are essentially inversely represented as heat absorption conditions in the furnace. It also makes it possible to work with higher burner temperatures than are permitted in a pusher furnace.
Die Erfindung eignet sich vornehmlich für Schmiedestücke von kompakter Querschnittsgestalt, d.h. von einer Ouerschnittsform, deren in unter¬ schiedlicher Richtung gemessene Abmessungen nicht wesentlich voneinander abweichen. Dies gilt vornehmlich für Kreisquerschnitte aber auch für poly¬ gonale Querschnitte, beispielsweise Rechteckquerschnitte mit nahe bei 1 liegendem Seitenlängenverhältnis. Diese Verhältnis sollte über 0,5, besser noch über 0,8 sein.The invention is particularly suitable for forgings of compact cross-sectional shape, i.e. a cross-sectional shape whose dimensions measured in different directions do not differ significantly from one another. This applies primarily to circular cross sections but also to polygonal cross sections, for example rectangular cross sections with an aspect ratio close to 1. This ratio should be above 0.5, better still above 0.8.
Die Erfindung wird um folgenden unter Bezugnahme auf die Zeichnung erläutert. In schemαtischer Darstellung veranschaulichen: Fig. 1 einen Längsschnitt durch einen Zwischenwärmofen mitThe invention is explained by the following with reference to the drawing. To illustrate in a schematic representation: Fig. 1 shows a longitudinal section through an intermediate heating furnace
Mαnipulαtorzαnge und Werkstück und Fig. 2 eine Stirnαnsicht des Ofens.Mαnipulαtorzαnge and workpiece and Fig. 2 is an end view of the furnace.
Das Ofengehäuse 1 ist am Umfang und einer Stirnseite geschlossen und bildet an der anderen Stirnseite eine Öffnung 2, die zu dem Schmiede¬ stück-Aufnahmeraum 3 führt, dessen Umfang von vorzugsweise gleichmäßig verteilten Gasbrennern 4 vorgegeben sind, bei denen es sich zweckmäßiger¬ weise um αußenmischende Brenner handelt, deren Flammen 5 auf die Ober¬ fläche 6 des Schmiedestücks 7 gerichtet sind, während dies von der Mαni¬ pulαtorzαnge 8 in dem Aufnαhmerαum 3 gehalten und zwecks gleichmäßigerer Wärmeverteilung gedreht wird. Die Brennerαnordnung und damit die Abmes¬ sung und Form des Schmiedestück-Aufnahmeraums kann beliebig geändert werden und insbesondere an unterschiedliche Schmiedestück formen angepaßt werden. Auf ein geschlossenes Gehäuse kann oftmals verzichtet werden. Die Brenner 4 können beispielsweise im Sinne des Pfeils 9 zur Anpassung an unterschiedliche Durchmesser des Schmiedestücks verstellt werden.The furnace housing 1 is closed on the circumference and on one end side and forms an opening 2 on the other end side, which leads to the forging-receiving space 3, the circumference of which is predefined by gas burners 4, which are preferably uniformly distributed and which are expediently External mixing burner is concerned, the flames 5 of which are directed onto the surface 6 of the forging 7, while this is held in the receptacle 3 by the magnetic pulley 8 and rotated for the purpose of more uniform heat distribution. The burner arrangement and thus the dimension and shape of the forging receiving space can be changed as desired and in particular adapted to different forging shapes. A closed housing can often be dispensed with. The burners 4 can be adjusted, for example, in the direction of the arrow 9 to adapt to different diameters of the forging.
Das zu erwärmende Schmiedestück 7 wird mittels des Manipulators 8 zum Zwischenwärmofen gebracht und in dessen Schmiedestück-Aufnahmeraum 3 etwa zentrische eingeschoben. Kurz davor oder danach werden die Brenner 4 eingeschaltet. Das Werkstück wird aufgeheizt und wieder entnommen. Die Brenner werden abgeschaltet. The forging 7 to be heated is brought to the intermediate heating furnace by means of the manipulator 8 and inserted approximately centrally in its forging-receiving space 3. Shortly before or after, the burners 4 are switched on. The workpiece is heated and removed again. The burners are switched off.

Claims

91/03576 PCT/EP90/01449- έ -Patentansprüche 91/03576 PCT / EP90 / 01449- έ patent claims
1 . Verfahren und Anordnung zum Zwischenwärmen eines in der Schmiedepresse oder im Hammer durch einen Manipulator gehaltenen Schmiedestücks, dadurch gekennzeichnet, daß das Schmiedestücks mittels des Manipulators einem nahe der Presse oder dem Hammer vorgesehenen, mit rings um einen Schmiedestück-Aufnahmeraum angeordneten Gasbrennern ausgerüsteten und für kurzf rist igen Brennerbet rieb ausgebildeten Zwischenwärmofen leichter Bauart zugeführt, darin gehalten und ggf . darin bewegt wird .1 . Method and arrangement for intermediate heating of a forging piece held in the forging press or in the hammer by a manipulator, characterized in that the forging piece by means of the manipulator is provided with a gas burner provided close to the press or the hammer and equipped with gas burners arranged around a forging piece and for short time The burner bed rubbed trained intermediate heating furnace of light design, held in it and if necessary. is moved in it.
2. Zwischenwärmofen zur Verwendung nach Anspruch 1 , dadurch gekennzeichnet , daß er mit außenmischenden Brennern ausgerüstet ist . 2. intermediate heating furnace for use according to claim 1, characterized in that it is equipped with external mixing burners.
PCT/EP1990/001449 1989-09-07 1990-08-30 Process and device for the intermediate heating of a forged piece WO1991003576A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893929754 DE3929754A1 (en) 1989-09-07 1989-09-07 METHOD AND ARRANGEMENT FOR INTERMEDIATE WARMING OF A FORGING PIECE
DEP3929754.3 1989-09-07

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102717023A (en) * 2012-06-28 2012-10-10 江苏金源锻造股份有限公司 Natural gas heating furnace
CN107838362A (en) * 2017-11-10 2018-03-27 苏州昆仑重型装备制造有限公司 Mould mends warm resistance furnace

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1061294A (en) * 1951-08-13 1954-04-12 United States Steel Corp Method of heating steel ingots for forging or extrusion
FR1125979A (en) * 1955-05-06 1956-11-12 Heating ramp
FR74242E (en) * 1958-10-03 1960-11-07 Forge furnace
US3334879A (en) * 1964-01-16 1967-08-08 Sievert App R Ab Combination furnace and forge
JPS58174526A (en) * 1982-04-06 1983-10-13 Daido Steel Co Ltd Apparatus for heating end part of billet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1061294A (en) * 1951-08-13 1954-04-12 United States Steel Corp Method of heating steel ingots for forging or extrusion
FR1125979A (en) * 1955-05-06 1956-11-12 Heating ramp
FR74242E (en) * 1958-10-03 1960-11-07 Forge furnace
US3334879A (en) * 1964-01-16 1967-08-08 Sievert App R Ab Combination furnace and forge
JPS58174526A (en) * 1982-04-06 1983-10-13 Daido Steel Co Ltd Apparatus for heating end part of billet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 8, No. 7 (C-204) (1444), 12. January 1984, & JP, A, 58174526 (Daido Tokushuko K.K.) 13. Oktober 1983 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102717023A (en) * 2012-06-28 2012-10-10 江苏金源锻造股份有限公司 Natural gas heating furnace
CN107838362A (en) * 2017-11-10 2018-03-27 苏州昆仑重型装备制造有限公司 Mould mends warm resistance furnace

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