EP0589099A1 - Method of forming round tubes into profiled tubes with polygonal or other non-circular sections - Google Patents
Method of forming round tubes into profiled tubes with polygonal or other non-circular sections Download PDFInfo
- Publication number
- EP0589099A1 EP0589099A1 EP92250272A EP92250272A EP0589099A1 EP 0589099 A1 EP0589099 A1 EP 0589099A1 EP 92250272 A EP92250272 A EP 92250272A EP 92250272 A EP92250272 A EP 92250272A EP 0589099 A1 EP0589099 A1 EP 0589099A1
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- European Patent Office
- Prior art keywords
- tubes
- tube
- forming
- polygonal
- radial force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/155—Making tubes with non circular section
-
- 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
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
Definitions
- the invention relates to a method and a device for carrying out the method for forming round, in particular longitudinally welded tubes into profile tubes with polygonal or other cross sections deviating from the circular shape.
- Pipes with a polygonal cross-section in larger dimensions were previously created exclusively by folding processes, whereby a flat strip was welded together in complex and specially designed machines to the finished profile tube after appropriate folding.
- the present invention has for its object to find a method and an apparatus for performing the method for forming round tubes into profile tubes with polygonal or other cross-sections deviating from the circular shape, which allows the production of these profile tubes in a simple and reliable manner without a large investment in equipment is required. Rather, known plants and plant parts should be able to be used.
- a method is proposed according to the invention, characterized in that the radius of the tube wall changes in these areas by stepwise radial force acting on regions of the tube inner wall spaced from one another in the circumferential direction, and the tube wall at least between the areas by simultaneously enlarging the inner circumference of the tube the radial force is stretched.
- an inward radial force acts on the tube wall between the areas of radial force during stretching.
- a force for example by means of a roller, to the flank areas of the finished profile tube.
- the shaping of the tubes can take place both in the cold and in the warm state, in a special development of the invention it is also conceivable that the tubes are heated differently in some areas before and / or during the shaping. So it is conceivable that through targeted Heating the edges or the flanks of the profile tube to be created supports or hinders the forming of individual areas.
- the profiled tubes be subjected to a heat treatment after they have been formed and then subjected to the forming process a second time.
- the heat-treated tubes can be straightened, calibrated, or their material characteristics can be improved. It is also conceivable within the scope of the invention to deform only the end region of the otherwise circular tubes.
- a device for carrying out the method according to the invention is characterized by a known expander for pipes with a tool designed according to the inner cross section of the profile pipe.
- the great advantage of the method according to the invention is that it can be carried out on a conventional system for expanding pipes, as is usually followed by pipe welding systems, in order to straighten and calibrate the welded pipes. It is only necessary to replace the tools with those with a corresponding surface, and the existing system can be used to form round tubes, for example square tubes.
- the tool is provided with expansion segments, the effective working surface of which, over their length running in the axial direction of the tube, form a transition from the round inside diameter of the tube to the finished polygonal inside diameter of the profile tube. Since, as is known, the expansion of the tubes takes place step by step by moving the tube over the expander tool, it must be formed from round to, for example Square be provided for a transition that allows the expander to be inserted into the round tube and eliminates damage to the inner tube in the transition area.
- 4 denotes the tube into which the expander 5 can be inserted on one side.
- the spreading segments 3 By spreading the spreading segments 3 on corresponding surfaces of the wedges 2 by actuating a pull rod 1, they are placed against the inside of the pipe 4 to be formed and carry out the method according to the invention.
- the expansion segments 3 By spreading the expansion segments 3, the wall of the tube 4 is stretched and overstretched, so that the tube wall follows the circumferential profile of the expanded expander 5.
- the desired cross-sections can be set, it being advisable to carry out an oval pre-deformation of the tube in the case of tubes to be rectangularly shaped, in order to be able to insert the tool into the tube.
- the deformation of the tube can also be limited to the end regions.
- FIG. 2 shows schematically how a round tube 4 can be shaped into a square tube
- FIG. 3 shows the shaping of an oval preformed tube into a tube with a rectangular cross section
- FIG. 4 shows the deformation of the round tube 4 into a profile tube with a hexagonal cross section.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Durchführung des Verfahrens zum Umformen von runden, insbesondere längsnahtgeschweißten Rohren in Profilrohre mit polygonalen oder anderen von der Kreisform abweichenden Querschnitten.The invention relates to a method and a device for carrying out the method for forming round, in particular longitudinally welded tubes into profile tubes with polygonal or other cross sections deviating from the circular shape.
Es ist beispielsweise aus der deutschen Patentschrift 12 67 647 bekannt, runde Rohre in Rohre eckigen Querschnitts mittels Walzen umzuformen, die mit rechtwinklig zur Rohrachse liegenden Achsen das Rohr gleichzeitig an vier Seiten flachdrücken. Im Inneren des Rohres ist eine dornartige Abstützung vorgesehen, gegen die die Walzen die Rohrwand andrücken, wobei die Ecken des eckig gewalzten Querschnittes freigelassen werden. Zur Verbesserung dieser Lösung ist es auch aus diesem Stand der Technik bekannt, den Dorn durch eine innere Abstützung zu ersetzen, die aus frei drehbaren, in jeder Ecke des eckigen Querschnittes angreifenden, in einer Rohrquerschnittsebene angeordneten und sich an einer Dornstange abstützenden Rollen besteht. In beiden Fällen erfolgt die Verformung des Rohres ausschließlich von außen durch Einwirkung der Walzen auf die Rohrwand im Bereich der Flanken des fertigen Vierkantrohres.It is known, for example from German patent specification 12 67 647, to shape round tubes into square-section tubes by means of rollers, which at the same time flatten the tube on four sides with axes perpendicular to the tube axis. A mandrel-like support is provided in the interior of the tube, against which the rollers press the tube wall, the corners of the angularly rolled cross section being left free. To improve this solution, it is also known from this prior art to replace the mandrel with an inner support, which consists of freely rotatable, engaging in every corner of the angular cross section, arranged in a tube cross-sectional plane and on a mandrel rod supporting roles. In both cases, the tube is deformed exclusively from the outside by the action of the rollers on the tube wall in the area of the flanks of the finished square tube.
Des weiteren ist das Walzen von Vierkantrohren Kleinerer Abmessungen, beispielsweise in Streckreduzierwalzwerken mittels Universalgerüsten bekannt.Furthermore, the rolling of square tubes of smaller dimensions, for example in stretch-reducing rolling mills using universal stands, is known.
Rohre mit polygonalem Querschnitt in größeren Abmessungsbereichen. beispielsweise > 400 mm Kantenlänge, wurden bisher ausschließlich durch Abkantverfahren erstellt, wobei ein flaches Band nach entsprechendem Abkanten in aufwendigen und speziell dafür vorgesehen Maschinen zum fertigen Profilrohr zusammengeschweißt wurde.Pipes with a polygonal cross-section in larger dimensions. For example,> 400 mm edge length, were previously created exclusively by folding processes, whereby a flat strip was welded together in complex and specially designed machines to the finished profile tube after appropriate folding.
Sowohl das erstgenannte Verfahren, wie auch das Abkantverfahren ist äußerst anlagenintensiv und damit sehr teuer. Für das Herstellen von Profilrohren, die beispielsweise in großer Zahl im Stahlhochbau gebraucht werden, sind bisher komplette Neuanlagen erforderlich gewesen, die ausschließlich zum Erstellen derartiger Rohre ausgelegt sein mußten.Both the first-mentioned process and the folding process are extremely system-intensive and therefore very expensive. For the production of profile tubes, which are used for example in large numbers in steel structures, complete new systems have so far been required, which had to be designed exclusively for the production of such tubes.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Durchführung des Verfahrens zum Umformen von runden Rohren in Profilrohre mit polygonalen oder anderen von der kreisform abweichenden Querschnitten zu finden, das in einfacher und funktionssicherer Weise die Herstellung dieser Profilrohre gestattet, ohne daß ein großer Anlagenaufwand erforderlich wird. Vielmehr sollen bekannte Anlagen und Anlagenteile benutzt werden können.The present invention has for its object to find a method and an apparatus for performing the method for forming round tubes into profile tubes with polygonal or other cross-sections deviating from the circular shape, which allows the production of these profile tubes in a simple and reliable manner without a large investment in equipment is required. Rather, known plants and plant parts should be able to be used.
Zur Lösung der Aufgabe wird erfindungsgemäß ein Verfahren vorgeschlagen, daß dadurch gekennzeichnet ist, daß durch schrittweise radiale Krafteinwirkung auf in Umfangsrichtung voneinander beabstandete Bereiche der Rohrinnenwand der Radius der Rohrwand in diesen Bereichen verändert und durch gleichzeitige Vergrößerung des Innenumfanges des Rohres die Rohrwand mindestens zwischen den Bereichen der radialen Krafteinwirkung gestreckt wird.To achieve the object, a method is proposed according to the invention, characterized in that the radius of the tube wall changes in these areas by stepwise radial force acting on regions of the tube inner wall spaced from one another in the circumferential direction, and the tube wall at least between the areas by simultaneously enlarging the inner circumference of the tube the radial force is stretched.
In Anlehnung an das bekannte, herkömmliche Expandieren runder Rohre in solche mit ebenfalls runden vergrößertem Innenquerschnitt, wird ein Verfahren vorgeschlagen, welches durch Expandieren des runden Rohres in ein Profilrohr mit polygonalen oder anderen von der Kreisform abweichenden Querschnitten gekennzeichnet ist. Dabei werden die im Rohrradius gekrümmten Rohrwandungen zwischen den Kanten des fertigen Rohres im plastischen Zustand gedehnt, so daß der gewünschte Querschnitt erhalten wird.Based on the known, conventional expansion of round tubes into those with a round, enlarged inner cross section, a method is proposed which is characterized by expanding the round tube into a profile tube with polygonal or other cross sections deviating from the circular shape. The pipe walls curved in the pipe radius between the edges of the finished pipe are stretched in the plastic state, so that the desired cross section is obtained.
In einer Ausgestaltung der Erfindung ist vorgesehen, daß auf die Rohrwand zwischen den Bereichen der radialen Krafteinwirkung während des Streckens eine nach innen gerichtete Radialkraft einwirkt. Sollte es bei bestimmten Rohrabmessungen und Werkstoffen erforderlich sein, so kann durch diesen Vorschlag der Erfindung das Expandieren des runden Rohres dadurch unterstützt werden, daß von außen auf die Flankenbereiche des fertigen Profilrohres eine Kraft, beispielsweise mittels einer Walze aufgebracht wird.In one embodiment of the invention it is provided that an inward radial force acts on the tube wall between the areas of radial force during stretching. Should it be necessary with certain tube dimensions and materials, the expansion of the round tube can be supported by this proposal of the invention by applying a force, for example by means of a roller, to the flank areas of the finished profile tube.
Das Umformen der Rohre kann sowohl im kalten wie auch im warmen Zustand erfolgen, in einer besonderen Weiterbildung der Erfindung ist es auch denkbar, daß die Rohre vor und/oder während der Umformung bereichsweise unterschiedlich erwärmt werden. So ist es denkbar, daß durch gezielte Erwärmung der Kanten oder der Flanken des zu erstellenden Profilrohres die Umformung einzelner Bereiche unterstützt oder behindert wird.The shaping of the tubes can take place both in the cold and in the warm state, in a special development of the invention it is also conceivable that the tubes are heated differently in some areas before and / or during the shaping. So it is conceivable that through targeted Heating the edges or the flanks of the profile tube to be created supports or hinders the forming of individual areas.
In einer anderen Ausgestaltung der Erfindung wird vorgeschlagen, daß die Profilrohre nach ihrer Umformung einer Wärmebehandlung unterzogen und im Anschluß daran ein zweites Mal dem Umformverfahren unterzogen werden. Durch diese zweimalige Umformung nach dem erfindungsgemäßen Verfahren können die wärmebehandelten Rohre gerichtet, kalibriert, oder auch hinsichtlich ihrer Materialkennwerte verbessert werden. Es ist im Rahmen der Erfindung auch denkbar, nur den Endbereich der ansonsten kreisrund belassenen Rohre zu verformen.In another embodiment of the invention, it is proposed that the profiled tubes be subjected to a heat treatment after they have been formed and then subjected to the forming process a second time. By means of this double reshaping according to the method according to the invention, the heat-treated tubes can be straightened, calibrated, or their material characteristics can be improved. It is also conceivable within the scope of the invention to deform only the end region of the otherwise circular tubes.
Eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens ist gekennzeichnet durch einen an sich bekannten Expander für Rohre mit entsprechend dem Innenquerschnitt des Profilrohres gestalteten Werkzeug. Der große Vorteil des erfindungsgemäßen Verfahrens besteht darin, daß es auf einer herkömmlichen Anlage zum Expandieren von Rohren durchgeführt werden kann, wie sie gewöhnlich Rohrschweißanlagen nachgeschaltet sind, um die geschweißten Rohre zu richten und zu kalibrieren. Es bedarf lediglich des Austauschs der Werkzeuge durch solche mit entsprechender Oberfläche und die bestehende Anlage kann zum Umformen runder Rohre, beispielsweise zu Vierkantrohren, eingesetzt werden.A device for carrying out the method according to the invention is characterized by a known expander for pipes with a tool designed according to the inner cross section of the profile pipe. The great advantage of the method according to the invention is that it can be carried out on a conventional system for expanding pipes, as is usually followed by pipe welding systems, in order to straighten and calibrate the welded pipes. It is only necessary to replace the tools with those with a corresponding surface, and the existing system can be used to form round tubes, for example square tubes.
In einer Weiterbildung der Vorrichtung ist vorgesehen, daß das Werkzeug mit Spreizsegmenten versehen ist, deren wirksame Arbeitsoberfläche über ihre in Achsrichtung des Rohres verlaufenden Länge einen Übergang vom runden Innendurchmesser des Rohres zu dem fertigen polygonalen Innendurchmesser des Profilrohres bilden. Da bekanntlich das Expandieren der Rohre schrittweise durch Fortbewegung des Rohres über das Expanderwerkzeug erfolgt, muß beim Umformen von rund in beispielsweise Vierkant für einen Übergang gesorgt werden, der ein Einführen des Expanders in das runde Rohr ermöglicht und Beschädigungen am Innenrohr im Übergangsbereich ausschaltet.In a further development of the device it is provided that the tool is provided with expansion segments, the effective working surface of which, over their length running in the axial direction of the tube, form a transition from the round inside diameter of the tube to the finished polygonal inside diameter of the profile tube. Since, as is known, the expansion of the tubes takes place step by step by moving the tube over the expander tool, it must be formed from round to, for example Square be provided for a transition that allows the expander to be inserted into the round tube and eliminates damage to the inner tube in the transition area.
Mit dem vorgeschlagenen Verfahren und der entsprechenden Vorrichtung läßt sich eine Anlage zum Herstellen von Rohren mit polygonalen oder anderen von der Kreisform abweichenden Querschnitten schaffen, die mit äußerst geringem Aufwand ein Vierkantrohr herstellen kann und trotzdem vielseitig verwendbar auch zum Expandieren runder Rohre eingesetzt werden kann.With the proposed method and the corresponding device, a system for the production of pipes with polygonal or other cross-sections deviating from the circular shape can be created, which can produce a square pipe with extremely little effort and yet can be used in a versatile manner for expanding round pipes.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben. Es zeigt:
- Fig. 1
- einen Längsschnitt durch ein zu verformendes Rohr mit darin angeordnetem Umformwerkzeug (Expander),
- Fig. 2, 3 u. 4
- Beispiele der Formgebung des umzuformenden Rohres.
- Fig. 1
- a longitudinal section through a pipe to be deformed with a forming tool (expander) arranged therein,
- 2, 3 u. 4th
- Examples of the shape of the pipe to be formed.
In Figur 1 ist mit 4 das Rohr bezeichnet, in das der Expander 5 einseitig einführbar ist. Durch Spreizen der Spreizsegmente 3 auf entsprechenden Flächen der Keile 2 durch Betätigung einer Zugstange 1 werden diese an die Innenseite des umzuformenden Rohres 4 angelegt und führen das erfindungsgemäße Verfahren durch. Durch das Spreizen der Spreizsegmente 3 wird die Wandung des Rohres 4 gestreckt und überdehnt, so daß die Rohrwandung dem Umfangsprofil des gespreizten Expanders 5 folgt.In Figure 1, 4 denotes the tube into which the expander 5 can be inserted on one side. By spreading the spreading
Auf diese Weise lassen sich die gewünschten Querschnitte einstellen, wobei es sich empfiehlt, im Fall rechteckig zu verformender Rohre eine ovale Vorverformung des Rohres vorzunehmen, um das Werkzeug in das Rohr einführen zu können. Auch kann die Verformung des Rohres auf die Endbereiche beschränkt werden.In this way, the desired cross-sections can be set, it being advisable to carry out an oval pre-deformation of the tube in the case of tubes to be rectangularly shaped, in order to be able to insert the tool into the tube. The deformation of the tube can also be limited to the end regions.
In Figur 2 ist schematisch angedeutet, wie ein rundes Rohr 4 in ein Vierkantrohr umformbar ist, Figur 3 zeigt die Umformung eines oval vorverformten Rohres in ein Rohr mit rechteckigem Querschnitt und Figur 4 die Verformung des runden Rohres 4 in ein Profilrohr mit sechseckigem Querschnitt.FIG. 2 shows schematically how a
Claims (9)
dadurch gekennzeichnet,
daß durch schrittweise radiale Krafteinwirkung auf in Umfangsrichtung voneinander beabstandete Bereiche der Rohrinnenwand der Radius der Rohrwand in diesen Bereich verändert und durch gleichzeitige Vergrößerung des Innenumfanges des Rohres die Rohrwand mindestens zwischen den Bereichen der radialen Krafteinwirkung gestreckt wird.Process for forming round, in particular longitudinally welded tubes into profile tubes with polygonal or other cross sections deviating from the circular shape,
characterized,
that the radius of the tube wall is changed in this area by gradual radial force acting on regions of the inner tube wall spaced from one another in the circumferential direction and the tube wall is stretched at least between the regions of the radial force effect by simultaneously increasing the inner circumference of the tube.
dadurch gekennzeichnet,
daß auf die Rohrwand zwischen den Bereichen der radialen Krafteinwirkung während des Streckens eine nach innen gerichtete Radialkraft einwirkt.Method according to claim 1,
characterized,
that an inward radial force acts on the tube wall between the areas of radial force during stretching.
dadurch gekennzeichnet,
daß die Umformung der Rohre im kalten Zustand erfolgt.The method of claim 1 or 2,
characterized,
that the forming of the pipes takes place in the cold state.
dadurch gekennzeichnet,
daß die Umformung der Rohre im warmen Zustand erfolgt.The method of claim 1 or 2,
characterized,
that the forming of the pipes takes place in the warm state.
dadurch gekennzeichnet,
daß die Rohre vor und/oder während der Umformung bereichsweise unterschiedlich erwärmt werden.Method according to claim 1, 2 or 4,
characterized,
that the tubes are heated differently in some areas before and / or during the forming.
dadurch gekennzeichnet,
daß die Profilrohre nach ihrer Umformung einer Wärmebehandlung unterzogen und im Anschluß daran ein zweites Mal dem Umformverfahren zugeführt werden.Method according to claims 1 to 5,
characterized,
that the profiled tubes are subjected to a heat treatment after they have been formed and are subsequently fed to the forming process a second time.
dadurch gekennzeichnet,
daß nur die Endbereiche des Rohrkörpers umgeformt werden.Method according to claims 1 to 6,
characterized,
that only the end regions of the tubular body are formed.
gekennzeichnet durch
einen ansich bekannten Expander (5) für Rohre mit entsprechend dem Innenquerschnitt des Profilrohres gestaltetem Werkzeug.Device for carrying out the method according to claim 1,
marked by
a known expander (5) for pipes with a tool designed according to the inner cross section of the profile pipe.
dadurch gekennzeichnet,
daß das Werkzeug mit Spreizsegmenten (3) versehen ist, deren wirksame Arbeitsoberfläche über ihre in Achsrichtung des Rohres verlaufende Lange einen übergang vom runden Innendurchmesser des Rohres (4) zu dem fertigen polygonalen Innendurchmesser des Profilrohres bildet.Device according to claim 8,
characterized,
that the tool is provided with expansion segments (3) whose effective working surface forms a transition from the round inner diameter of the tube (4) to the finished polygonal inner diameter of the profile tube over its length running in the axial direction of the tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP92250272A EP0589099A1 (en) | 1992-09-24 | 1992-09-24 | Method of forming round tubes into profiled tubes with polygonal or other non-circular sections |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP92250272A EP0589099A1 (en) | 1992-09-24 | 1992-09-24 | Method of forming round tubes into profiled tubes with polygonal or other non-circular sections |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0589099A1 true EP0589099A1 (en) | 1994-03-30 |
Family
ID=8211205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92250272A Withdrawn EP0589099A1 (en) | 1992-09-24 | 1992-09-24 | Method of forming round tubes into profiled tubes with polygonal or other non-circular sections |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0589099A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012066268A (en) * | 2010-09-22 | 2012-04-05 | Yutaka Giken Co Ltd | Method and apparatus for forming deformed cylindrical body |
| WO2013075628A1 (en) * | 2011-11-24 | 2013-05-30 | 贵州安大航空锻造有限责任公司 | Method for hot bulge-forming high-temperature alloy rectangular ring-rolled workpiece into irregularly-shaped ring workpiece |
| CN114273458A (en) * | 2021-12-24 | 2022-04-05 | 武汉市博钛新材料科技有限公司 | High-frequency induction seamless special-shaped titanium welded pipe and production method thereof |
| DE102020213223A1 (en) | 2020-10-20 | 2022-04-21 | Sms Group Gmbh | Device for lubricating a mold and method for lubricating |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH407926A (en) * | 1962-01-26 | 1966-02-28 | Spiro Investment Sa | Method and apparatus for manufacturing a tube |
| DE1267647B (en) * | 1964-10-21 | 1968-05-09 | John Edvin Hjalmarsson | Device for the continuous deformation of round tubes into tubes with an angular cross-section |
| DE2363629A1 (en) * | 1973-12-20 | 1975-06-26 | Nokia Oy Ab | Pipe section shaper for rectangular cross section - has mandrel with longitudinal expansion beams with contact strips for corners |
| DE2837184A1 (en) * | 1978-08-25 | 1980-03-06 | Kabel Metallwerke Ghh | METHOD AND DEVICE FOR PRODUCING TUBES FOR HEAT EXCHANGERS |
| DE3030978A1 (en) * | 1980-08-16 | 1982-04-01 | B.S.L. (Bignier Schmid-Laurent), Ivry-sur-Seine | Rectangular-section tube formed from round tube - by pressure elements locally expanding latter in four radial directions |
-
1992
- 1992-09-24 EP EP92250272A patent/EP0589099A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH407926A (en) * | 1962-01-26 | 1966-02-28 | Spiro Investment Sa | Method and apparatus for manufacturing a tube |
| DE1267647B (en) * | 1964-10-21 | 1968-05-09 | John Edvin Hjalmarsson | Device for the continuous deformation of round tubes into tubes with an angular cross-section |
| DE2363629A1 (en) * | 1973-12-20 | 1975-06-26 | Nokia Oy Ab | Pipe section shaper for rectangular cross section - has mandrel with longitudinal expansion beams with contact strips for corners |
| DE2837184A1 (en) * | 1978-08-25 | 1980-03-06 | Kabel Metallwerke Ghh | METHOD AND DEVICE FOR PRODUCING TUBES FOR HEAT EXCHANGERS |
| DE3030978A1 (en) * | 1980-08-16 | 1982-04-01 | B.S.L. (Bignier Schmid-Laurent), Ivry-sur-Seine | Rectangular-section tube formed from round tube - by pressure elements locally expanding latter in four radial directions |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012066268A (en) * | 2010-09-22 | 2012-04-05 | Yutaka Giken Co Ltd | Method and apparatus for forming deformed cylindrical body |
| WO2013075628A1 (en) * | 2011-11-24 | 2013-05-30 | 贵州安大航空锻造有限责任公司 | Method for hot bulge-forming high-temperature alloy rectangular ring-rolled workpiece into irregularly-shaped ring workpiece |
| DE102020213223A1 (en) | 2020-10-20 | 2022-04-21 | Sms Group Gmbh | Device for lubricating a mold and method for lubricating |
| WO2022084113A1 (en) | 2020-10-20 | 2022-04-28 | Sms Group Gmbh | Device for lubricating a forming tool, and method for lubrication |
| CN114273458A (en) * | 2021-12-24 | 2022-04-05 | 武汉市博钛新材料科技有限公司 | High-frequency induction seamless special-shaped titanium welded pipe and production method thereof |
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