EP1706228B1 - Hot flow forming and bending method, and device for carrying out said method - Google Patents

Hot flow forming and bending method, and device for carrying out said method Download PDF

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Publication number
EP1706228B1
EP1706228B1 EP05700800A EP05700800A EP1706228B1 EP 1706228 B1 EP1706228 B1 EP 1706228B1 EP 05700800 A EP05700800 A EP 05700800A EP 05700800 A EP05700800 A EP 05700800A EP 1706228 B1 EP1706228 B1 EP 1706228B1
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EP
European Patent Office
Prior art keywords
bending
roll
heated
rolls
profiled section
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EP05700800A
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German (de)
French (fr)
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EP1706228A1 (en
Inventor
Walter E. SPÄTH
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Klingelnberg AG
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Klingelnberg AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/10—Bending tubes using mandrels or the like by passing between rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
    • B21D9/03—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length and built-up from loose elements, e.g. series of balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand
    • B21D9/18—Auxiliary equipment, e.g. machines for filling tubes with sand for heating or cooling of bends

Definitions

  • the invention relates to a method for hot-flow forming and a device for carrying out this method according to the preamble of claims 1 and 11.
  • the bending takes place in the form of two- or even three-dimensional shapes.
  • profiles z. B. magnesium alloys or even in high-strength steels has been found that a pure cold-forming bending is not sufficient. Due to the high strength of the material to be reshaped and associated brittleness, the formability is not sufficient to reshape the profile satisfactorily. At certain degrees of deformation, the profile breaks, tears or is otherwise damaged, so that it has not previously been possible to bend such delicate profiles.
  • the invention is therefore based on the object to propose a novel method for bending deformation of thin-walled and sensitive, open, semi-open and closed profiles, which works reliable.
  • the invention is characterized by a method according to the technical teaching of claim 1.
  • rollers arranged in the bending roll zone are heated.
  • roller roll is used in the following description for at least one of these two roles. However, this is not literal to understand, because these roles functionally no longer exclusively a Auswalzaufgabe, but they also serve the shape of the profile in the bending roll zone. The actual bending of the profile takes place at a distance between the bending roller located at the rear in the inlet direction and at least one support roller arranged at a distance in the inlet direction at the front.
  • the invention is not limited to the heated arrangement of rolling rolls in the region of the bending roll zone.
  • additional rollers in particular the support roller arranged in the inlet direction in front of the bending-rolling zone, and the opposite counter-roller, which make it possible to support the profile to be bent with respect to the bending roller at the front in the inlet direction.
  • each roller carries an outer current-carrying jacket, which is electrically insulated inwardly by an insulating ring from an inner support, wherein the carrier is rotatably connected in a conventional manner with the shaft.
  • the opposite role is formed in the same way. If now a relatively high current of z. B. 1000 to 2000 amps to give a role, then there are a number of differently extending current paths that extend at least partially through the profile to be bent. Due to corresponding resistance heating, the profile is heated highly efficiently only in the bending roll zone. These rungs go - as stated - partly through the profile to be bent. However, some of the current paths also run inwards in the direction of a mandrel shaft held in the region of the bending-rolled zone, via the mandrel rod of which part of the current flows is likewise discharged to the outside. As a result, the resistance heating also takes place in the interior of the profile.
  • temperatures in the bending-rolled zone of approximately between 150 and 200 ° C. are generated.
  • temperatures in the range between 700 and 900 ° C are preferred.
  • This heating is preferably generated by said current flow resistance heating.
  • the invention is not limited thereto.
  • the invention can also provide that the opposed rolling rolls are equipped with known heating cartridges which preheat the rolling rolls.
  • the rolling rolls are heated by other heating means such.
  • other heating means such as liquid heating means, which are conducted into the interior of the rolling rolls, by hot air heating means which act directly on the rollers, by infrared or by inductive heating of the rolling rolls.
  • these rolling rolls can be heated by means of laser energy. All mentioned heating methods can also be combined with each other.
  • the invention is also not limited to the heating of the roller and the roller opposite this with respect to the bending roll zone.
  • vertical rollers perpendicular to the two rollers mentioned, so-called vertical rollers are additionally heated. All heating methods are used, as described above.
  • the said vertical rolling rolls attach themselves to the side wall of the profile to be bent, where they concentrate the heat into the profile to be bent into the side wall.
  • the invention is not limited to the heating of rolling rolls in the region of the bending roll zone, but it is provided in a development that the rollers lying in the inlet direction are heated. These are the support roller and the opposing roller opposite the support roller, which in turn both bear against the opposite walls of the profile.
  • the heating in this area corresponds to a preheating of the profile, which is then finally heated concentrated in the Biegewalzzone and heated. This significantly improves the transformation of sensitive profiles.
  • each heating station is designed as a radiant heater (IR heater).
  • IR heater radiant heater
  • other heating mechanisms such.
  • a mandrel shaft is preferably carried in the interior of the profile, which is fastened to a mandrel rod.
  • a link chain is arranged at the front end, which runs supportingly in the interior of the profile and extends out of the bending zone into the region of the bending roller so as to offer the bending roller a corresponding counter bearing.
  • the mandrel shaft is heated.
  • the heating is preferably carried out via the described Strom letikiung.
  • the slide carriage 9 is driven by drives 10 in the longitudinal direction of the machine bridge 1, so as to insert the profile 21 to be formed into the bending head 70.
  • a mandrel shaft 25 is arranged in the region of the bending roll zone 40, which preferably consists of several elements.
  • the mandrel shaft 25 forms a second support element 27, which prevents buckling or collapse of the profile in the region of the bending-rolled zone 40.
  • the bending of the profile to be reshaped is thus preferably effected by the action of the bending roller 13 on the profile 21 to be formed, whereby a corresponding back pressure is achieved by the spaced behind the support roller 17.
  • These vertical rollers is to additionally guide the profile in the area of the side wall and to prevent it from breaking out in this area.
  • the entire profile 21 rests on a support table 22 in order to prevent the profile from sinking.
  • this Stromhneloomung is to be regarded in the field of support roller 17 and the counter-roller 18 as preheating for the actual heating in the bending roll zone 40.
  • the bending roller 13 is also mounted on a sliding carriage 67, but the bending roller 13 is not heated.
  • each heated by current flow heating roller 11, 14, 17, 18, 15, 16, 19, 20 of an electrically conductive jacket 41 which is isolated via an electrically insulating insulating ring 43 of an optionally conductive support 42.
  • the respective carrier 42 is then rotatably connected respectively to the shaft 44.
  • the outlet-side end of the heating channel 30 is provided with a closure plate 39 in order to prevent impermissible escape of the heat developed therefrom from the heating channel 30.
  • the essential difference of the hot-flow forming process according to the invention for cold-flow bending is that during cold-flow forming, the bending rolls require a certain penetration depth into the material of the profile to be formed, in order to achieve a microstructure flow. This structure flow is achieved by a rolling effect and this by a specific Penetration depth of the profile cross section reached in the reshaped profile.
  • the novel hot-flow bending according to the invention because - as previously shown - the actual rolling rollers, namely the center roller 11 and the roller 14 make no actual Auswalzung the profile more, but only assume a support function and a power line.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • General Induction Heating (AREA)

Abstract

Disclosed is a method for hot flow forming and bending closed, half-open, and open profiled members. Said method uses a bending machine comprising at least two rollers (17, 18) which are disposed across from each other in the feeding direction of the bending profiled member and behind which at least one milling roller (14) and an opposite central roller (11) are arranged at an axial distance in the feeding direction, said at least one milling roller (14) and central roller (11) jointly embodying a roll bending zone for the profiled member that is to be shaped. At least one bending roller (13) which can be moved against and away from the profiled member that is to be bent is arranged at the discharge end. In order to be able to shape thin-walled and sensitive open, half-open, and closed profiled members, at least the rollers (11, 14) located in the roll bending zone are heated.

Description

Gegenstand der Erfindung ist ein Verfahren zum Warmfließformbiegen und eine Vorrichtung zur Ausführung dieses Verfahrens nach dem Oberbegriff der Patentansprüche 1 und 11.The invention relates to a method for hot-flow forming and a device for carrying out this method according to the preamble of claims 1 and 11.

Aus älteren Anmeldungen des gleichen Anmelders ist bekannt, mit sogenannten Vier-Rollen-Biegemaschinen auch empfindliche und dünnwandige, geschlossene, halboffene und offene Profile zu biegen.From older applications of the same applicant is known to bend with so-called four-roller bending machines and sensitive and thin-walled, closed, semi-open and open profiles.

Die Biegung erfolgt in Form von zwei- oder auch von dreidimensionalen Formgebungen.The bending takes place in the form of two- or even three-dimensional shapes.

Bei der Umformung von Profilen z. B. aus Magnesiumleg ierungen oder auch bei hochfesten Stählen hat sich herausgestellt, dass ein reines Kalt-Umformbiegen nicht ausreicht. Durch die hohe Festigkeit des umzuformenden Materials und einer damit verbundenen Sprödigkeit bedingt, reicht die Umformfähigkeit nicht aus, das Profil zufriedenstellend umzuformen. Bei bestimmten Umformgraden bricht das Profil, reißt aus oder wird in anderer Weise beschädigt, so dass es bisher nicht möglich war, solche empfindlichen Profile zu biegen.When forming profiles z. B. magnesium alloys or even in high-strength steels has been found that a pure cold-forming bending is not sufficient. Due to the high strength of the material to be reshaped and associated brittleness, the formability is not sufficient to reshape the profile satisfactorily. At certain degrees of deformation, the profile breaks, tears or is otherwise damaged, so that it has not previously been possible to bend such delicate profiles.

Insbesondere bei dünnwandigen Profilen hat es sich herausgestellt, dass diese Profile zum Ausbeulen neigen und eine Umformung bisher nicht möglich war.Especially with thin-walled profiles, it has been found that these profiles tend to bulge and a conversion has not been possible.

Gemäß US-A-3 368 377 wird das zu biegende Rohr vor dem Biegevorgang durch eine Induktions-Heizvorrichtung erwärmt.According to US-A-3,368,377 the pipe to be bent is heated by an induction heater before the bending operation.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein neuartiges Verfahren zur Biegeumformung von dünnwandigen und empfindlichen, offenen, halboffenen und geschlossenen Profilen vorzuschlagen, welches betriebssicher arbeitet.The invention is therefore based on the object to propose a novel method for bending deformation of thin-walled and sensitive, open, semi-open and closed profiles, which works reliable.

Zur Lösung der gestellten Aufgabe ist die Erfindung durch ein Verfahren nach der technischen Lehre des Anspruches 1 gekennzeichnet.To solve the problem, the invention is characterized by a method according to the technical teaching of claim 1.

Wesentlich ist, dass mindestens die in der Biegewalzzone angeordneten Rollen beheizt sind.It is essential that at least the rollers arranged in the bending roll zone are heated.

In einer bevorzugten Ausgestaltung der Erfindung ist es vorgesehen, dass die dort angeordneten und einander gegenüberliegenden Rollen, die sich an den einander gegenüberliegenden Wänden des Profils anlegen, entsprechend beheizt sind.In a preferred embodiment of the invention, it is provided that the arranged there and opposing roles that create the opposite walls of the profile, are heated accordingly.

Zwar wird in der folgenden Beschreibung für mindestens eine dieser beiden Rollen der Begriff "Walzrolle" verwendet. Dies ist jedoch nicht wortgetreu zu verstehen, denn diese Rollen haben funktionell nicht mehr ausschließlich eine Auswalzaufgabe, sondern sie dienen zusätzlich der Formführung des Profils in der Biegewalzzone. Die eigentliche Biegung des Profils erfolgt im Abstand zwischen der in Einlaufrichtung hinten liegenden Biegerolle und mindestens einer im Abstand in Einlaufrichtung vorne angeordneten Stützrolle.Although the term "rolling roll" is used in the following description for at least one of these two roles. However, this is not literal to understand, because these roles functionally no longer exclusively a Auswalzaufgabe, but they also serve the shape of the profile in the bending roll zone. The actual bending of the profile takes place at a distance between the bending roller located at the rear in the inlet direction and at least one support roller arranged at a distance in the inlet direction at the front.

Die Erfindung ist jedoch nicht auf die beheizte Anordnung von Walzrollen im Bereich der Biegewalzzone beschränkt. Es können selbstverständlich auch zusätzlich weitere Rollen beheizt werden, insbesondere die in Einlaufrichtung vor der Biegewalzzone angeordneten Stützrolle und die gegenüberliegende Gegenrolle, welche eine Abstützung des zu biegenden Profils gegenüber der in Einlaufrichtung vorne liegenden Biegerolle ermöglichen.However, the invention is not limited to the heated arrangement of rolling rolls in the region of the bending roll zone. Of course, it is also possible to heat additional rollers, in particular the support roller arranged in the inlet direction in front of the bending-rolling zone, and the opposite counter-roller, which make it possible to support the profile to be bent with respect to the bending roller at the front in the inlet direction.

Für die Ausbildung der Beheizung gibt es ebenfalls verschiedene Ausführungsformen, die alle vom Erfindungsgegenstand der vorliegenden Erfindung umfasst sein sollen.There are also various embodiments for the formation of the heating, all of which are to be included in the subject matter of the present invention.

In einer ersten bevorzugten Ausgestaltung der Erfindung ist es vorgesehen, dass die in der Biegewalzzone einander gegenüberliegend angeordneten Walzrollen (nämlich die obere Walzrolle und die gegenüberliegende Mittelrolle) elektrisch leitfähig (hoch-stromführend) ausgebildet sind. Zu diesem Zweck trägt jede Walzrolle einen außenliegenden stromführenden Mantel, der radial einwärts durch einen Isolierring von einem inneren Träger elektrisch isoliert ist, wobei der Träger in an sich bekannter Weise drehfest mit der Welle verbunden ist.In a first preferred embodiment of the invention, it is provided that in the bending roll zone opposite each other arranged rolling rolls (namely, the upper roller and the opposite center roller) are electrically conductive (high-current carrying) are formed. For this purpose, each roller carries an outer current-carrying jacket, which is electrically insulated inwardly by an insulating ring from an inner support, wherein the carrier is rotatably connected in a conventional manner with the shaft.

Die gegenüberliegende Rolle ist in gleicher Weise ausgebildet. Wird nun ein relativ hoher Strom von z. B. 1000 bis 2000 Ampere auf die eine Rolle aufgegeben, dann ergeben sich eine Reihe unterschiedlich verlaufender Strompfade, die sich mindestens teilweise durch das zu biegende Profil erstrecken. Aufgrund entsprechender Widerstandserwärmung wird das Profil hochwirksam lediglich in der Biegewalzzone gezielt erwärmt. Diese Strompfade gehen - wie ausgeführt - teilweise durch das zu biegenden Profil hindurch. Teilweise verlaufen die Strompfade jedoch auch nach innen in Richtung auf einen im Bereich der Biegewalzzone gehaltenen Dornschaft, über dessen Dornstange ebenfalls ein Teil der Stromflüsse nach außen abgeleitet wird. Dadurch erfolgt die Widerstandserwärmung auch im Innenraum des Profils.The opposite role is formed in the same way. If now a relatively high current of z. B. 1000 to 2000 amps to give a role, then there are a number of differently extending current paths that extend at least partially through the profile to be bent. Due to corresponding resistance heating, the profile is heated highly efficiently only in the bending roll zone. These rungs go - as stated - partly through the profile to be bent. However, some of the current paths also run inwards in the direction of a mandrel shaft held in the region of the bending-rolled zone, via the mandrel rod of which part of the current flows is likewise discharged to the outside. As a result, the resistance heating also takes place in the interior of the profile.

Ein weiterer Stromfluss erfolgt durch die einander gegenüberliegenden Rollen direkt unter elektrischer Zwischenschaltung des leitfähigen Profils, so dass lediglich die Biegewalzzone konzentriert und mit hohem Wirkungsgrad mit sehr hohen Temperaturen aufgeheizt wird.Another current flow takes place through the opposing rollers directly under electrical interposition of the conductive profile, so that only the bending roll zone is concentrated and heated with high efficiency at very high temperatures.

Bei der Umformung von dünnwandigem Magnesiumprofilen bzw. Magnesiumlegierungsprofilen werden hierbei Temperaturen in der Biegewalzzone von etwa zwischen 150 bis 200 °C erzeugt.In the forming of thin-walled magnesium profiles or magnesium alloy profiles, temperatures in the bending-rolled zone of approximately between 150 and 200 ° C. are generated.

Bei der Umformung von hochfesten Stahlblechprofilen werden hingegen Temperaturen im Bereich zwischen 700 und 900 °C bevorzugt.In the conversion of high-strength steel sheet profiles, however, temperatures in the range between 700 and 900 ° C are preferred.

Wichtig bei dieser Ausführungsform ist, dass konzentriert lediglich in der Biegewalzzone eine relativ hohe Erwärmung stattfindet. Diese Erwärmung wird bevorzugt durch die genannte Stromfluss-Widerstandsheizung erzeugt.Important in this embodiment is that concentrated only in the bending roll zone, a relatively high heating takes place. This heating is preferably generated by said current flow resistance heating.

Hierauf ist die Erfindung jedoch nicht beschränkt. Die Erfindung kann auch vorsehen, dass die einander gegenüberliegenden Walzrollen mit an sich bekannten Heizpatronen bestückt sind, welche die Walzrollen vorheizen.However, the invention is not limited thereto. The invention can also provide that the opposed rolling rolls are equipped with known heating cartridges which preheat the rolling rolls.

Ebenso ist es möglich, Heizwendeln in die einander gegenüberliegenden Walzrollen einzulegen, um diese ebenfalls über einen entsprechenden Stromfluss aufzuheizen.It is also possible to insert heating coils in the opposite rolling rollers, to heat them also via a corresponding current flow.

Neben der hier genannten Widerstandsstromflussheizung und der Beheizung mit einzelnen Heizelementen ist in einer Weiterbildung der Erfindung vorgesehen, dass die Walzrollen durch andere Heizmittel aufgeheizt werden, wie z. B. durch flüssige Heizmittel, die in den Innenraum der Walzrollen geleitet werden, durch Warmluftheizmittel, welche unmittelbar auf die Rollen wirken, durch Infrarot oder durch induktive Erwärmung der Walzrollen.In addition to the mentioned resistance current flow heating and heating with individual heating elements is provided in a further development of the invention that the rolling rolls are heated by other heating means such. B. by liquid heating means, which are conducted into the interior of the rolling rolls, by hot air heating means which act directly on the rollers, by infrared or by inductive heating of the rolling rolls.

Ebenso können diese Walzrollen mit Hilfe von Laser-Energie aufgeheizt werden. Alle genannten Heizverfahren können auch untereinander kombiniert werden.Likewise, these rolling rolls can be heated by means of laser energy. All mentioned heating methods can also be combined with each other.

Die Erfindung ist auch nicht auf die Aufheizung der Walzrolle und der dieser bezüglich der Biegewalzzone gegenüberliegenden Mittelrolle beschränkt.The invention is also not limited to the heating of the roller and the roller opposite this with respect to the bending roll zone.

In einer Weiterbildung der Erfindung ist es vorgesehen, dass auch senkrecht zu den beiden erwähnten Rollen vorgesehene, sogenannte Vertikalwalzrollen zusätzlich aufgeheizt sind. Es werden hierbei sämtliche Heizverfahren angewendet, wie sie vorstehend beschrieben wurden. Die genannten Vertikalwalzrollen legen sich an der Seitenwand des zu biegenden Profils an und führen dort konzentriert die Wärme in das zu biegende Profil in die Seitenwand ein.In a further development of the invention, it is provided that perpendicular to the two rollers mentioned, so-called vertical rollers are additionally heated. All heating methods are used, as described above. The said vertical rolling rolls attach themselves to the side wall of the profile to be bent, where they concentrate the heat into the profile to be bent into the side wall.

Insbesondere wenn die vorher erwähnte Stromflussheizung verwendet wird, ergeben sich auch Stromflusspfade, welche sich über die Vertikalwalzrollen erstrecken.In particular, when the aforementioned current flow heating is used, there are also current flow paths which extend over the vertical rolling rolls.

Die Erfindung ist nicht auf die Beheizung von Walzrollen im Bereich der Biegewalzzone beschränkt, sondern es ist in einer Weiterbildung vorgesehen, dass die in der Einlaufrichtung vorne liegenden Rollen beheizt sind. Es handelt sich hierbei um die Stützrolle und die der Stützrolle gegenüberliegende Gegenrolle, die sich wiederum beide an den einander gegenüberliegenden Wänden des Profils anlegen.The invention is not limited to the heating of rolling rolls in the region of the bending roll zone, but it is provided in a development that the rollers lying in the inlet direction are heated. These are the support roller and the opposing roller opposite the support roller, which in turn both bear against the opposite walls of the profile.

Auch diese beiden Rollen können über sämtliche vorbeschriebenen Heizmechanismen beheizt werden. Die Beheizung in diesem Bereich entspricht dann einer Vorwärmung des Profils, welches dann endgültig in der Biegewalzzone konzentriert aufgeheizt und erwärmt wird. Damit wird die Umformung auch empfindlicher Profile wesentlich verbessert.These two roles can be heated by all the above heating mechanisms. The heating in this area then corresponds to a preheating of the profile, which is then finally heated concentrated in the Biegewalzzone and heated. This significantly improves the transformation of sensitive profiles.

Durch die kontrollierte Anordnung von Strompfaden, die sich dadurch ergeben, dass sich die einander gegenüberliegenden Walzrollen in der Biegewalzzone elektrisch leitfähig an das Profil anlegen, ergeben sich genau definierte Strompfade, so dass es durch die Anlegung des Stromes möglich ist, die Temperatur in der Biegewalzzone auf +- 1°C genau zu regeln.The controlled arrangement of current paths, which result from the fact that the opposing rolling rolls in the bending roll zone create an electrically conductive effect on the profile, result in precisely defined current paths, so that it is possible by the application of the current, the temperature in the bending roll zone to be regulated precisely to + - 1 ° C.

Zur Regelung werden entsprechende Temperatursensoren an den einander gegenüberliegenden Walzrollen angeordnet, welche den Stromfluss durch die Anordnung regeln.To control appropriate temperature sensors are arranged on the opposite rollers, which regulate the flow of current through the arrangement.

In einer Weiterbildung der Erfindung ist es im Übrigen vorgesehen, dass auf der Einlaufseite des Profils, nämlich im Bereich der Maschinenbrücke eine weitere Vorwärmung stattfindet. Diese Vorwärmung kann aus einem Heizkanal bestehen, in dessen Innenraum eine Anzahl von mehreren hintereinander angeordneten Heizstationen angeordnet sind.In a further development of the invention, it is otherwise provided that further preheating takes place on the inlet side of the profile, namely in the region of the machine bridge. This preheating may consist of a heating channel, in the interior of which a number of several heating stations arranged one behind the other are arranged.

Diese Heizstationen können in beliebiger Weise eine vordefinierte Erwärmung des Profils erbringen.These heating stations can provide a predefined heating of the profile in any way.

Es wird hierbei jedoch bevorzugt, dass jede Heizstation als Strahlungsheizung (IR-Heizung) ausgebildet ist. Neben der Strahlungsheizung können jedoch auch noch andere Heizmechanismen verwendet werden, wie z. B. Induktionsheizungen und bevorzugt andere berührungslose Heizverfahren.However, it is hereby preferred that each heating station is designed as a radiant heater (IR heater). In addition to the radiant heating but also other heating mechanisms can be used, such. B. induction heaters and preferably other non-contact heating methods.

Mit der gegebenen technischen Lehre ergibt sich der Vorteil, dass auch sehr empfindliche Magnesium und Magnesiumlegierungen bzw. Aluminium-Magnesium-Legierungen auch bei dünnstwandigen Wandstärken erstmals sicher umgeformt werden können, ohne dass es zu einem Bruch oder einem Ausbeulen des Profils kommt.With the given technical teaching, there is the advantage that even very sensitive magnesium and magnesium alloys or aluminum-magnesium alloys can be safely transformed for the first time even with thinnest wall thicknesses, without any breakage or buckling of the profile.

Zur Abstützung des Profils von der Innenseite wird bevorzugt im Innenraum des Profils ein Dornschaft mitgeführt, der an einer Dornstange befestigt ist.To support the profile from the inside, a mandrel shaft is preferably carried in the interior of the profile, which is fastened to a mandrel rod.

Hierbei wird es bevorzugt, wenn am vorderen Ende eine Gliederkette angeordnet ist, die abstützend im Innenraum des Profils verläuft und aus der Biegezone heraus in den Bereich der Biegerolle hineinreicht, um so der Biegerolle ein entsprechendes Gegenlager zu bieten.In this case, it is preferred if a link chain is arranged at the front end, which runs supportingly in the interior of the profile and extends out of the bending zone into the region of the bending roller so as to offer the bending roller a corresponding counter bearing.

Damit wird eine Abstützung des Profils gegenüber der Biegerolle erreicht, so dass die Biegerolle nicht das Profil noch nachträglich deformieren kann.For a support of the profile relative to the bending roller is achieved, so that the bending roller can not deform the profile later.

Hier ist es in einer Weiterbildung der Erfindung vorgesehen, dass der Dornschaft beheizt ist. Wie bereits schon vorhin angegeben, erfolgt die Beheizung bevorzugt über die beschriebene Stromflussheizung.Here it is provided in a development of the invention that the mandrel shaft is heated. As already stated above, the heating is preferably carried out via the described Stromflussheizung.

Für die Beheizung des Dornschaftes können jedoch auch alle anderen vorher genannten Heizmechanismen einzeln und/oder in Kombination untereinander verwendet werden, insbesondere eine Strahlungsheizung, eine Flüssigkeitsheizung, eine Laserheizung und dergleichen mehr.For the heating of the mandrel shaft, however, all other previously mentioned heating mechanisms can be used individually and / or in combination with one another, in particular radiation heating, liquid heating, laser heating and the like.

Im Folgenden wird die Erfindung anhand von lediglich einen Ausführungsweg darstellenden Zeichnungen näher erläutert. Hierbei gehen aus den Zeichnungen und ihrer Beschreibung weitere Merkmale und Vorteile der Erfindung hervor.In the following the invention will be explained in more detail with reference to drawings showing only one embodiment. Here are the drawings and their description further features and advantages of the invention.

Es zeigen:

Figur 1:
schematisiert dargestellte perspektivische Ansicht einer Warmfließformbiegemaschine nach der Erfindung
Figur 2:
eine vergrößerte teilweise Darstellung des Biegekopfes im Schnitt
Figur 3:
die Darstellung der Warmfließformbiegemaschine nach Figur 1 mit weiteren Einzelheiten
Figur 4:
ein Schnitt gemäß der Linie IV-IV in Figur 3
Figur 5:
ein Schnitt gemäß der Linie V-V in Figur 3
Show it:
FIG. 1:
schematically illustrated perspective view of a hot-forming bending machine according to the invention
FIG. 2:
an enlarged partial view of the bending head in section
FIG. 3:
the representation of the hot-flow forming machine according to Figure 1 with further details
FIG. 4:
a section along the line IV-IV in Figure 3
FIG. 5:
a section along the line VV in Figure 3

In Figur 1 ist eine Maschinenbrücke 1 dargestellt, auf der eine Reihe von hintereinander angeordneten Führungsstationen 3, 4, 5 befestigt ist. An der hinteren Seite der Maschinenbrücke ist eine Dornhaltestation 2 für die Halterung von 2 Dornstangen 6, 7 angeordnet.In Figure 1, a machine bridge 1 is shown, on which a number of successively arranged guide stations 3, 4, 5 is attached. At the rear side of the machine bridge a mandrel holding station 2 for the support of 2 mandrel bars 6, 7 is arranged.

Die Führungsstationen 3, 4, 5 dienen sowohl zur Führung der Dornstangen 6, 7 als auch zur Führung eines nicht näher dargestellten, umzuformenden Profils 21.The guide stations 3, 4, 5 are used both for guiding the mandrel bars 6, 7 and for guiding a profile 21, which is not shown in detail, to be reshaped.

In nicht näher dargestellter Weise ist dieses Profil 21 in einem Einspannkopf 8 eingespannt, der mit einem Schubschlitten 9 verbunden ist.In a manner not shown, this profile 21 is clamped in a gripping head 8, which is connected to a sliding carriage 9.

Der Schubschlitten 9 wird über Antriebe 10 in Längsrichtung der Maschinenbrücke 1 angetrieben verfahren, um so das umzuformende Profil 21 in den Biegekopf 70 einzuschieben.The slide carriage 9 is driven by drives 10 in the longitudinal direction of the machine bridge 1, so as to insert the profile 21 to be formed into the bending head 70.

Aus den Figuren 2 und 3 gehen weitere Einzelheiten hervor.From Figures 2 and 3 show more details.

Die Figur 3 zeigt, dass es in einer Ausführungsform wesentlich ist, dass dem umzuformenden Profil 21 ein Heizkanal 30 zugeordnet ist.FIG. 3 shows that, in one embodiment, it is essential that a heating channel 30 is assigned to the profile 21 to be formed.

Dieser Heizkanal besteht aus einer Reihe von hintereinander angeordneten Heizstationen 31, 32, 33, von denen jede Heizstation mehrere Strahler 34, 35 aufweist.This heating channel consists of a series of successively arranged heating stations 31, 32, 33, each of which heating station has a plurality of radiators 34, 35.

Ferner sind in dem Heizkanal 30 noch Führungsrollen 37 angeordnet, welche pendelnd gelagert sind und mit Hilfe von Federelementen 38 gegen das umzuformende Profil 21 angestellt werden.Further, in the heating channel 30 still guide rollers 37 are arranged, which are mounted oscillating and are employed by means of spring elements 38 against the profile 21 to be formed.

Der Schnitt durch den Halbkanal 30 ist in Figur 4 dargestellt. Dort sind die einzelnen, vorher erwähnten Teile im Schnitt gezeichnet.The section through the half-channel 30 is shown in FIG. There, the individual, previously mentioned parts are drawn in section.

Anstatt von 2 Dornstangen 6, 7 - wie in Figur 1 dargestellt - wird hier nur eine einzige Dornstange 6 verwendet.Instead of 2 mandrel bars 6, 7 - as shown in Figure 1 - only a single mandrel 6 is used here.

Anhand der Figuren 2 und 3 wird nun der erfindungsgemäße neue Biegekopf 70 näher erläutert.With reference to Figures 2 and 3, the novel bending head 70 according to the invention will now be explained in more detail.

Er besteht im Wesentlichen aus einer Mittelrolle 11, die auf einer Drehachse 12 drehbar gelagert ist und beispielsweise in Pfeilrichtung 29 drehend angetrieben ist.It consists essentially of a center roller 11, which is rotatably mounted on a rotation axis 12 and is driven to rotate in the direction of arrow 29, for example.

Der Mittelrolle 11 liegt - dem biegenden Profil gegenüber - eine Walzrolle 14 gegenüber, so dass durch diese beiden Walzrollen 11, 14 eine Biegewalzzone 40 für das umzuformende Profil 21, 21' definiert wird.The center roller 11 is - opposite the bending profile - a rolling roller 14, so that by these two rolling rollers 11, 14 a bending roll zone 40 for the reshaped profile 21, 21 'is defined.

So kann die Walzrolle 14 angetrieben sein und zusätzlich arbeitet der Schubschlitten 9 in Richtung der Längsachse des Profils 21, um dieses durch die Biegewalzzone 40 hindurchzuschieben.Thus, the rolling roller 14 may be driven and in addition the thrust slide 9 operates in the direction of the longitudinal axis of the profile 21 in order to push it through the bending roll zone 40.

Im Innenraum des Hohlprofils ist hierbei im Bereich der Biegewalzzone 40 ein Dornschaft 25 angeordnet, der bevorzugt aus mehreren Elementen besteht.In the interior of the hollow profile in this case a mandrel shaft 25 is arranged in the region of the bending roll zone 40, which preferably consists of several elements.

Das hintere Ende des Dornschaftes 25 wird durch ein erstes Stützelement 26 gebildet, welches im Zwischenraum zwischen einer Stützrolle 17 und einer die dem gegenüberliegenden Gegenrolle 18 angeordnet ist.The rear end of the mandrel shaft 25 is formed by a first support member 26 which is arranged in the intermediate space between a support roller 17 and one which is the opposite counter-roller 18.

Im Bereich der Biegewalzzone 40 bildet der Dornschaft 25 ein zweites Stützelement 27 aus, welches ein Einbeulen oder ein Einbruch des Profils im Bereich der Biegewalzzone 40 verhindert.In the region of the bending-rolled zone 40, the mandrel shaft 25 forms a second support element 27, which prevents buckling or collapse of the profile in the region of the bending-rolled zone 40.

Im Bereich nach vorne ist der Dornschaft 25 mit einer Gliederkette 28 verbunden, die aus einzelnen, gelenkig miteinander verbundenen Gliedern besteht, die sich an der Innenwand des Hohlprofils anlegen, wobei die Gliederkette 28 bis in den Bereich der Biegerolle 13 führt.In the area to the front of the mandrel shaft 25 is connected to a link chain 28, which consists of individual, hingedly interconnected links which rest against the inner wall of the hollow profile, wherein the link chain 28 leads into the region of the bending roller 13.

Die Biegerolle 13 ist verschwenkbar ausgebildet und kann in beliebiger Weise auf das zu biegende Profil 21' zugestellt werden, um so eine definierte Biegung zu erreichen.The bending roller 13 is formed pivotable and can be delivered in any way to the profile to be bent 21 ', so as to achieve a defined bend.

Die Biegung des umzuformenden Profils erfolgt also bevorzugt durch die Einwirkung der Biegerolle 13 auf das umzuformende Profil 21, wodurch ein entsprechender Gegendruck von der im Abstand dahinter angeordneten Stützrolle 17 erreicht wird.The bending of the profile to be reshaped is thus preferably effected by the action of the bending roller 13 on the profile 21 to be formed, whereby a corresponding back pressure is achieved by the spaced behind the support roller 17.

Die Umformung (ein Warmfließformbiegen) erfolgt jedoch im Bereich der Biegewalzzone 40.However, the forming (a hot-flow forming bending) takes place in the region of the bending-rolled zone 40.

Die Figur 5 zeigt, dass im Bereich der Biegewalzzone 40 noch weitere Walzrollen angeordnet werden können, welche sich an die obere und untere Seitenwand des Profils anlegen. Die Vertikalwalzrollen 15, 16 sind in Figur 5 dargestellt.FIG. 5 shows that in the region of the bending-rolled zone 40, further rolling rolls can be arranged, which rest against the upper and lower side walls of the profile. The vertical rollers 15, 16 are shown in FIG.

Sinn dieser Vertikalwalzrollen ist, noch zusätzlich das Profil im Bereich der Seitenwand zu führen und ein Ausbrechen in diesem Bereich zu verhindern.The purpose of these vertical rollers is to additionally guide the profile in the area of the side wall and to prevent it from breaking out in this area.

Es ist im Übrigen nicht näher dargestellt, dass auch im Bereich der Stütz- und der Gegenrolle 17, 18 wiederum in senkrechter Ebene hierzu weitere Vertikalwalzrollen 19, 20 angeordnet sein können, so wie dies in Figur 2 angedeutet ist.Incidentally, it is not shown in detail that in the area of the supporting and counter rollers 17, 18, vertical rollers 19, 20 can again be arranged in a vertical plane, as indicated in FIG.

Das gesamte Profil 21 liegt im Übrigen auf einem Auflagetisch 22 auf, um ein Herabsinken des Profils zu verhindern.Incidentally, the entire profile 21 rests on a support table 22 in order to prevent the profile from sinking.

Der Biegekopf weist im Übrigen einen Boden 23 und einen oberen Deckel 24 auf.The bending head has, moreover, a bottom 23 and an upper lid 24.

Wichtig ist nun die elektrische Stromflussheizung im Bereich der Biegewalzzone 40, wie sie anhand der Figur 2 näher dargestellt ist.Now important is the electric current heating in the region of the bending roll zone 40, as shown in more detail with reference to FIG 2.

Zunächst ist erkennbar, dass die obere Walzrolle 14 auf einem Schubschlitten 65 drehbar gelagert ist, der in Richtung auf das zu biegende Profil zu und wegstellbar ausgebildet ist.
An diesem Schubschlitten 25 wird nun der eine Pol einer Stromflussquelle angelegt, während der andere Pol der Stromflussquelle elektrisch leitfähig mit der gegenüberliegenden Mittelrolle 11 verbunden wird.First, it can be seen that the upper roller 14 is rotatably mounted on a sliding carriage 65, which is formed in the direction of the profile to be bent and wegstellbar.
At this slide carriage 25, the one pole of a current flow source is now applied, while the other pole of the current flow source is electrically conductively connected to the opposite center roller 11.

Es kommt daher zur Ausbildung der Strompfade 55-64, die in der Zeichnung mit den Strompfaden A1 bis A10 im Einzelnen eingetragen sind.It therefore comes to the formation of the current paths 55-64, which are entered in the drawing with the current paths A1 to A10 in detail.

Beispielsweise erstreckt sich der Strompfad A1 von der Mittelrolle 11 über den elektrisch leitfähigen Mantel 41 auf die Oberfläche des Profils 21 und wird dort in Form des Strompfades 62 (A8) umgeleitet und fließt über das Profil ab.For example, the current path A1 extends from the central roller 11 via the electrically conductive jacket 41 on the surface of the profile 21 and is redirected there in the form of the current path 62 (A8) and flows over the profile.

Der Strompfad A3 geht in den Strompfad A4 über. Der Strompfad A5 geht in den Strompfad A6 über. Der Strompfad A7 geht in den Strompfad A8 über. Der Strompfad A9 geht in den Strompfad A10 über.The current path A3 merges into the current path A4. The current path A5 goes into the current path A6. The current path A7 merges into the current path A8. The current path A9 goes into the current path A10.

Alle Strompfade sind miteinander vernetzt und elektrisch leitfähig miteinander verbunden.All current paths are networked together and electrically connected with each other.

Durch die Einleitung eines relativ großen Stromes, der über den elektrisch leitfähigen Mantel 41 der Walzrolle 14 auf das elektrisch leitfähige Profil 21 fließt, und von diesem Profil auf den elektrisch leitfähigen Mantel 41 der Mittelrolle 11 ergeben sich konzentrierte hoch energiereiche Heizzonen im Bereich der Biegewalzzone 40, so dass das empfindliche Profil konzentriert nur im Bereich dieser Umformzone aufgeheizt wird.The introduction of a relatively large current which flows via the electrically conductive jacket 41 of the rolling roller 14 onto the electrically conductive profile 21 and from this profile onto the electrically conductive jacket 41 of the center roller 11 results in concentrated high-energy heating zones in the region of the bending roll zone 40 , so that the sensitive profile is concentrated heated only in the area of this forming zone.

Es ist noch dargestellt, dass die gleichen Heizmechanismen mit den Strompfaden auch im Bereich der senkrecht hierzu angeordneten Vertikalwalzrollen 15, 16 angeordnet sein können.It is also shown that the same heating mechanisms with the current paths can also be arranged in the region of the vertical rolling rollers 15, 16 arranged perpendicular thereto.

Ebenso ist dargestellt, dass auch der Dornschaft 25 elektrisch leitfähig ausgebildet ist, wobei die Stützelemente 26, 27 ebenfalls elektrisch leitfähig sind und der Strom dann schließlich über die Dornstange 6 nach hinten abgeleitet wird.It is also shown that the mandrel shaft 25 is formed electrically conductive, wherein the support members 26, 27 are also electrically conductive and the current is then finally discharged via the mandrel 6 to the rear.

Die Figur 2 zeigt im Übrigen, dass auch die Stützrolle 17 und die Gegenrolle 18 in der gleichen Weise elektrisch beheizt sind, wobei ein entsprechender Stromfluss über den Schubschlitten 66 eingeleitet wird und der Gegenpol beispielsweise elektrisch leitfähig mit dem Mantel der Gegenrolle 18 verbunden ist.The figure 2 shows, moreover, that the support roller 17 and the counter-roller 18 are electrically heated in the same manner, wherein a corresponding current flow is introduced via the thrust slide 66 and the opposite pole, for example, electrically connected to the mantle of the counter-roller 18.

Es ergeben sich dann die Strompfade 45-54 mit den in der Zeichnung eingetragenen Bezeichnungen B1 bis B10.This results in the current paths 45-54 with the designations B1 to B10 entered in the drawing.

Auch hier kommt es zu einer vielfältigen Verzweigung der Strompfade, wobei diese Stromflussbeheizung im Bereich der Stützrolle 17 und der Gegenrolle 18 als Vorwärmung für die eigentliche Beheizung in der Biegewalzzone 40 anzusehen ist.Again, there is a manifold branching of the current paths, this Stromflussbeheizung is to be regarded in the field of support roller 17 and the counter-roller 18 as preheating for the actual heating in the bending roll zone 40.

Auch hier kann es vorgesehen sein, dass senkrecht hierzu verlaufende Vertikalwalzrollen 19, 20 angeordnet sind, die in der gleichen Weise beheizt sein können.Again, it may be provided that perpendicular thereto vertical rolling rollers 19, 20 are arranged, which may be heated in the same manner.

Die Biegerolle 13 ist im Übrigen auch auf einem Schubschlitten 67 gelagert, wobei jedoch die Biegerolle 13 nicht beheizt ist.Incidentally, the bending roller 13 is also mounted on a sliding carriage 67, but the bending roller 13 is not heated.

Wie bereits schon eingangs erwähnt, besteht jede durch Stromflussheizung beheizte Rolle 11, 14, 17, 18, 15, 16, 19, 20 aus einem elektrisch leitfähigen Mantel 41, der über einen elektrisch isolierenden Isolierring 43 von einem gegebenenfalls leitfähigen Träger 42 isoliert ist. Der jeweilige Träger 42 ist dann jeweils mit der Welle 44 drehfest verbunden.As already mentioned above, each heated by current flow heating roller 11, 14, 17, 18, 15, 16, 19, 20 of an electrically conductive jacket 41, which is isolated via an electrically insulating insulating ring 43 of an optionally conductive support 42. The respective carrier 42 is then rotatably connected respectively to the shaft 44.

Zur Figur 3 wird noch angemerkt, dass das auslaufseitige Ende des Heizkanals 30 mit einer Abschlussplatte 39 versehen ist, um eine unzulässige Entweichung der dort entwickelten Wärme aus dem Heizkanal 30 zu verhindern.3, it is also noted that the outlet-side end of the heating channel 30 is provided with a closure plate 39 in order to prevent impermissible escape of the heat developed therefrom from the heating channel 30.

Der gesamten Heizeinrichtung ist ein entsprechend dimensionierter Transformator zugeordnet, der die entsprechenden Stromleistungen zur Verfügung stellt.The entire heater is associated with a correspondingly sized transformer, which provides the corresponding power outputs available.

Der wesentliche Unterschied des erfindungsgemäßen Warmfließformbiegeverfahrens zum Kaltfließformbiegen liegt darin, dass beim Kaltfließformbiegen die Biegerollen eine gewisse Eindringtiefe in das Material des umzuformenden Profils benötigt wird, um einen Gefügefluss zu erreichen. Dieser Gefügefluss wird durch einen Walzeffekt erzielt und dieser durch eine bestimmte Eindringtiefe des Profilquerschnitts in das umzuformende Profil erreicht. Hier liegt ein wesentlicher Unterschied zu dem neuartigen erfindungsgemäßen Warmfließformbiegen, weil - wie vorher dargestellt - die eigentlichen Walzrollen, nämlich die Mittelrolle 11 und die Walzrolle 14 keine eigentliche Auswalzung des Profils mehr vornehmen, sondern lediglich eine Stützfunktion und eine Stromleitung übernehmen.The essential difference of the hot-flow forming process according to the invention for cold-flow bending is that during cold-flow forming, the bending rolls require a certain penetration depth into the material of the profile to be formed, in order to achieve a microstructure flow. This structure flow is achieved by a rolling effect and this by a specific Penetration depth of the profile cross section reached in the reshaped profile. Here is a significant difference to the novel hot-flow bending according to the invention, because - as previously shown - the actual rolling rollers, namely the center roller 11 and the roller 14 make no actual Auswalzung the profile more, but only assume a support function and a power line.

Aufgrund der Widerstandserwärmung in der Walzbiegezone 40 wird eine Erwärmung im Gefüge des umzuformenden Profils erzeugt, um das Gefüge biegefähig zu machen. Ein entsprechendes Magnesiumprofil wäre bei Raumtemperaturen nicht umformbar. Hier wird die vorher erwähnte verdrehte Erwärmung in der Biegewalzzone ermöglicht, um das Gefüge der Magnesiumlegierung fließfähig zu machen und eine Umformung im Bereich zwischen der Biegerolle 13 und der im Abstand davon angeordneten Stützrolle 17 zu ermög lichen.Due to the resistance heating in the rolling bending zone 40, a heating in the structure of the profile to be formed is generated in order to make the structure bendable. A corresponding magnesium profile would not be deformable at room temperatures. Here, the aforementioned twisted heating in the bending roll zone is made possible to make the structure of the magnesium alloy flowable and a union in the region between the bending roller 13 and the spaced therefrom support roller 17 made union.

Auf ein hochfestes Stahlmaterial bezogen bedeutet dies, dass dieses hochfeste Stahlmaterial in der Biegewalzzone im Temperaturbereich zwischen 700 bis 1000 °C aufgeheizt werden muss, um ebenfalls einen Gefügefluss in der Biegewalzzone zu ermöglichen und hierdurch erstmals die Umformung dieses Profils zu erreichen.Based on a high-strength steel material, this means that this high-strength steel material in the bending roll zone in the temperature range between 700 to 1000 ° C must be heated to also allow a microstructure flow in the bending roll zone and thereby achieve the first time the transformation of this profile.

Zeichnungslegendedrawing Legend

11
Maschinenbrückemachines bridge
22
DornhaltestationDorn holding station
33
Führungsstationtransfer station
44
Führungsstationtransfer station
55
Führungsstationtransfer station
66
Dornstangemandrel
77
Dornstangemandrel
88th
Einspannkopfchuck
99
SchubschlittenTraverse frame
1010
Antriebdrive
1111
MittelrolleCentral role
1212
Drehachseaxis of rotation
1313
Biegerolle 13' 13"Bending roller 13 '13 "
1414
Walzrolleroller
1515
VertikalwalzrolleVertical roller
1616
VertikalwalzrolleVertical roller
1717
Stützrollesupporting role
1818
Gegenrollecounter-roller
1919
VertikalwalzrolleVertical roller
2020
VertikalwalzrolleVertical roller
2121
Profil 21'Profile 21 '
2222
Auflagetischsupport table
2323
Boden (Biegekopf)Bottom (bending head)
2424
Deckelcover
2525
Dornschaftspike shaft
2626
Stützelement (hinten)Support element (rear)
2727
Stützelement (vorne)Support element (front)
2828
Gliederkettelink chain
2929
Pfeilrichtungarrow
3030
Heizkanalheating duct
3131
Heizstationheating station
3232
Heizstationheating station
3333
Heizstationheating station
3434
Strahler (oben)Spotlight (above)
3535
Strahler (seitlich)Spotlight (side)
3636
Führung (Schubschlitten 9)Guide (slide carriage 9)
3737
Führungsrolleleadership
3838
Federelementspring element
3939
AbschlussplatteEnd plate
4040
BiegewalzzoneRoll-bending zone
4141
Mantelcoat
4242
Trägercarrier
4343
Isolierunginsulation
4444
Wellewave
4545
Strompfad B1Rung B1
4646
Strompfad B2Rung B2
4747
Strompfad B3Rung B3
4848
Strompfad B4Rung B4
4949
Strompfad B5Rung B5
5050
Strompfad B6Rung B6
5151
Strompfad B7Rung B7
5252
Strompfad B8Rung B8
5353
Strompfad B9Rung B9
5454
Strompfad B10Rung B10
5555
Strompfad A1Rung A1
5656
Strompfad A2Current path A2
5757
Strompfad A3Rung path A3
5858
Strompfad A4Rung path A4
5959
Strompfad A5Rung A5
6060
Strompfad A6Rung A6
6161
Strompfad A7Rung A7
6262
Strompfad A8Rung A8
6363
Strompfad A9Rung A9
6464
Strompfad A10Rung A10
6565
SchubschlittenTraverse frame
6666
SchubschlittenTraverse frame
6767
SchubschlittenTraverse frame
6868
6969
7070
Biegekopfbending head

Claims (17)

  1. Process for the hot flow-form bending of thin-walled closed, half-open or open profiled sections with a bending machine comprising a bending head consisting of at least two rolls (17, 18) which are arranged opposite one another in the feed direction of the profiled section (21, 21') to be bent, and at an axial distance behind which in the feed direction at least one milling roll (14) and one opposing middle roll (11) are arranged which together constitute a roll-bending zone (40) for the profiled section (21, 21') to be worked, at least one bending roll (13) that can be traversed towards and away from the profiled section to be bent being arranged on the discharge side, characterized in that at least the rolls (11, 14) arranged in the roll-bending zone (40) are heated.
  2. Process according to Claim 1, characterized in that other rolls of the bending machine are heated too.
  3. Process according to Claim 1 or Claim 2, characterized in that the support roll (17) arranged before the roll-bending zone in the feed direction and the opposing counter-roll (18), which enable the profiled section to be supported against the bending roll forward-located in the feed direction, are heated.
  4. Process according to Claim [sic] according to any one of Claims 1 to 3, characterized in that the milling rolls arranged opposite one another in the roll-bending zone are electrically conducting and are energized by a high current which passes through the profiled section (21, 21') to be worked, at least in the region of the roll-bending zone.
  5. Process according to any one of Claims 1 to 4, characterized in that in the roll-bending zone, the applied current is also conducted to the inside of the profiled section to be worked, on a mandrel shank arranged in the interior.
  6. Process according to any one of Claims 1 to 5, characterized in that the rolls are heated by a liquid heating medium.
  7. Process according to any one of Claims 1 to 6, characterized in that the rolls are heated up by electrically heated cartridge heaters and/or heater coils.
  8. Process according to any one of Claims 1 to 7, characterized in that the rolls are heated up by radiation heating and/or by induction heating.
  9. Process according to any one of Claims 1 to 8, characterized in that other, vertical, milling rolls arranged perpendicularly to the heated rolls and arranged in the roll-bending zone, are heated too.
  10. Process according to any one of Claims 1 to 8, characterized in that pre-heating takes place on the feed side of the profiled section, namely in the region of the machine bridge.
  11. Bending machine for carrying out the process according to any one of Claims 1 to 10, for the hot flow-form bending of thin-walled closed, half-open or open profiled sections with a bending head consisting of at least two rolls (17, 18) which are arranged opposite one another in the feed direction of the profiled section (21, 21') to be bent, and at an axial distance behind which in the feed direction at least one milling roll (14) and one opposing middle roll (11) are arranged which together constitute a roll-bending zone (40) for the profiled section (21, 21') to be worked, at least one bending roll (13) that can be traversed towards and away from the profiled section to be bent being arranged on the discharge side, characterized in that at least the rolls (11, 14) arranged in the roll-bending zone (40) are heatable.
  12. Bending machine according to Claim 11, characterized in that, during operation, the profiled section (21, 21') to be worked is additionally propelled through the roll-bending zone (40).
  13. Bending machine according to either of Claims 11 and 12, characterized in that a mandrel shank is provided, the mandrel shank (25) being heated in the region of the roll-bending zone (40) and constituting a support element (27) for the interior of the profiled section.
  14. Bending machine according to Claim 13, characterized in that a link chain (28) consisting of individual articulated links that bear on the inner wall of the hollow profiled section is attached to the forward end of the mandrel shank (25), the said link chain (28) leading as far as the region of the bending roll (13).
  15. Bending machine according to any one of Claims 11 to 14, characterized in that vertical milling rolls (15, 16) that bear on the upper and lower side walls of the profiled section are arranged in the region of the roll-bending zone (40).
  16. Bending machine according to Claim 15, characterized in that the vertical milling rolls (15, 16) are heated too.
  17. Bending machine according to any one of Claims 11 to 16, characterized in that, during operation, a current flows through the electrically conducting shell (41) of the milling roll (14) and through the electrically conducting profiled section (21) to be worked, and is led therefrom to the electrically conducting shell (41) of the middle roll (11).
EP05700800A 2004-01-24 2005-01-11 Hot flow forming and bending method, and device for carrying out said method Not-in-force EP1706228B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004003682A DE102004003682A1 (en) 2004-01-24 2004-01-24 Method for hot-flow forming and a device for carrying out the method
PCT/EP2005/000162 WO2005070581A1 (en) 2004-01-24 2005-01-11 Hot flow forming and bending method, and device for carrying out said method

Publications (2)

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EP1706228A1 EP1706228A1 (en) 2006-10-04
EP1706228B1 true EP1706228B1 (en) 2007-07-25

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EP05700800A Not-in-force EP1706228B1 (en) 2004-01-24 2005-01-11 Hot flow forming and bending method, and device for carrying out said method

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EP (1) EP1706228B1 (en)
JP (1) JP2007518571A (en)
KR (1) KR20060126790A (en)
CN (1) CN1909991A (en)
AT (1) ATE367875T1 (en)
CA (1) CA2553738A1 (en)
DE (2) DE102004003682A1 (en)
MX (1) MXPA06008166A (en)
RU (1) RU2006130467A (en)
WO (1) WO2005070581A1 (en)

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DE102007028649A1 (en) 2007-06-21 2008-12-24 Koukal, Anton Method for bending spatial semi-finished product of plastic ductile material, involves bending semi-finished product within radially extending area by repetitive stretching under plastic flowability in space
DE102007043805A1 (en) * 2007-09-13 2009-03-19 Patentgesellschaft Maranatha Method and device for bending or linearly rolling profiles with axleless mini roll rollers
DE102008006293A1 (en) * 2008-01-28 2009-07-30 Patentgesellschaft Maranatha Method and device for bending round tubes and profiles
JP2013081988A (en) * 2011-10-11 2013-05-09 Fuji Seiko Kk Method for bending magnesium-based pipe
CN102941256A (en) * 2012-09-29 2013-02-27 安徽省宁国市晨光汽车零部件有限公司 Pipe bender
CN103331345B (en) * 2013-07-10 2015-04-08 西北工业大学 Stretch-bending forming device with insulated stretching head and forming method thereof
CN103752666B (en) * 2014-01-08 2015-09-30 哈尔滨理工大学 The tubing press shaping die method of flexible chain ball plug
CN103878213B (en) * 2014-03-03 2016-10-05 昆明天彪机电有限责任公司 Stainless steel carries pipe bend shaped device
CN104646962B (en) * 2015-01-08 2017-06-27 舟山市奥博管业有限公司 The preparation method of oil return pipe of supercharger
KR101648174B1 (en) * 2015-06-29 2016-08-12 (유)성문 helix pipe bending apparatus
CN106391777A (en) * 2016-10-19 2017-02-15 中安安轩安全产业发展有限公司 Guardrail bending device suitable for site construction
CN108305348A (en) * 2017-12-25 2018-07-20 重庆达德机械制造有限公司 A kind of multifunctional pipe bending machine
KR102101133B1 (en) * 2019-12-27 2020-04-14 문원호 Bending apparatus for mesh plate for fence
CN113617903B (en) * 2021-06-15 2022-06-10 浙江大学 Hot bending forming device suitable for multi-size rectangular pipes
CN113182404B (en) * 2021-07-01 2021-09-03 江苏晶杰光电科技有限公司 Bending device for thin-wall metal pipe
CN113560826B (en) * 2021-08-13 2022-09-09 燕山大学 Welded pipe forming method for comprehensively controlling springback through warm forming and light overbending
CN113941629B (en) * 2021-10-09 2024-04-16 上海航天精密机械研究所 Laser-assisted roll bending forming method for difficult-to-deform profile

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US3368377A (en) * 1965-09-17 1968-02-13 Hirayama Atsuo Methods of bending electrically conductive long materials such as bar, rod, and pipe, and means therefor
DE2546695B2 (en) * 1975-10-17 1979-10-31 Daiichi Koshuha Kogyo K.K., Tokio Device for the continuous bending of elongated workpieces
IT8453880V0 (en) * 1984-10-02 1984-10-02 Mauro Meliga BENDING MACHINE FOR PROFILED AND SIMILAR TUBES
JP2736629B2 (en) * 1995-11-24 1998-04-02 矢崎化工株式会社 Cold bending method of ribbed resin-coated steel pipe and bent ribbed resin-coated steel pipe
FR2770794B1 (en) * 1997-11-07 2000-01-21 Silfax DEVICE FOR HEATING A SHAPING TOOL

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CN1909991A (en) 2007-02-07
WO2005070581A1 (en) 2005-08-04
ATE367875T1 (en) 2007-08-15
EP1706228A1 (en) 2006-10-04
KR20060126790A (en) 2006-12-08
MXPA06008166A (en) 2007-01-30
RU2006130467A (en) 2008-02-27
DE102004003682A1 (en) 2005-08-11
DE502005001095D1 (en) 2007-09-06
CA2553738A1 (en) 2005-08-04
JP2007518571A (en) 2007-07-12

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