EP0129010B1 - Method of and device for extruding hollow sections - Google Patents

Method of and device for extruding hollow sections Download PDF

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Publication number
EP0129010B1
EP0129010B1 EP84103929A EP84103929A EP0129010B1 EP 0129010 B1 EP0129010 B1 EP 0129010B1 EP 84103929 A EP84103929 A EP 84103929A EP 84103929 A EP84103929 A EP 84103929A EP 0129010 B1 EP0129010 B1 EP 0129010B1
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EP
European Patent Office
Prior art keywords
die
extrusion
mandrel
recipient
hollow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84103929A
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German (de)
French (fr)
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EP0129010A3 (en
EP0129010A2 (en
Inventor
Rudolf Drach
Dieter Achenbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vereinigte Aluminium Werke AG
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Vereinigte Aluminium Werke AG
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Publication date
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Priority to AT84103929T priority Critical patent/ATE30860T1/en
Publication of EP0129010A2 publication Critical patent/EP0129010A2/en
Publication of EP0129010A3 publication Critical patent/EP0129010A3/en
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Publication of EP0129010B1 publication Critical patent/EP0129010B1/en
Expired legal-status Critical Current

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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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes
    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/21—Presses specially adapted for extruding metal
    • B21C23/217—Tube extrusion presses
    • 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
    • B21C25/00—Profiling tools for metal extruding

Definitions

  • the invention relates to a method and a device for the extrusion of hollow profiles, which have graduated cross sections on the outside over the length of the profile, an ingot with the press disk being introduced into a recipient and pressed over a movable mandrel by means of a hollow punch through a die.
  • DE-C-969 393, in particular FIGS. 1/2, contains a two-stage pressing process, namely compression of a cross-sectional enlargement with a “die” (5, 5 ') closed at the end and subsequent pressing out via the die (4).
  • a metal extrusion press for producing hollow profiles in particular made of aluminum, is equipped with a plurality of matrices that can be released one behind the other, which enable the pressing of offset profiles.
  • the mandrel is set down at its tip in the die area and is arranged to be longitudinally movable in the press ram.
  • a plurality of releasable matrices arranged one behind the other are provided, which are held and released by resistance bearings that can be moved obliquely outwards.
  • the object of the present invention is to avoid the disadvantages described and to develop a method and a device which enables simple, low-wear production of stepped hollow profiles of high dimensional accuracy.
  • the closure plate is moved transversely to the strand direction and replaced with a pressure plate with a profiled opening.
  • quench sensitive alloys in particular of the type AIMgSi, AIMgMn, AICuMg, AIZnMgCu can also be used.
  • a one-piece die is used in the tool package. This guarantees greater dimensional accuracy and tool stability.
  • a hollow bar is introduced into the recipient, which has a temperature gradient in the pressing direction.
  • the temperature gradient must be designed so that the actual pressing temperature is between 400 and 500 ° C when using aluminum materials.
  • the mandrel moves through the die into a central closed position of the closed pressure plate (closing plate) when the press begins.
  • the central locking position ensures that the outer contour of the hollow profile remains absolutely true to size.
  • the method according to the invention also enables the use of a one-part rotationally symmetrical die. This reduces tool costs and has a favorable influence on the strength curve within the die.
  • the matrix can be moved together with the recipient. This reduces tool movements and idle times in the workflow and increases the pressing speed.
  • a further development feature of the device according to the invention is that the mandrel has at least one mandrel shoulder in the pressing direction, which brings about a reduction in cross-section compared to the mandrel outlet diameter of 30 to 50%.
  • the mandrel shoulder With this design of the mandrel shoulder, any contours of a hollow profile can be produced with high degrees of deformation.
  • the die is centered in the tool holder or in the pressure ring. This is particularly important since the dimensional accuracy of the profiles is not guaranteed when changing tools without centering.
  • the method for extruding hollow profiles begins with an ingot, preferably a hollow ingot 1, being introduced into the recipient 3 with the pressing disk 2.
  • the insert tool consisting of an undivided die 4, is supported in the pressed position against a closed pressure plate (closing plate 5) and is fastened in a tool holder 6.
  • the tool package with the profiled pressure plate 7 is in the waiting position.
  • Fig. 2 the insertion of the mandrel into the die is now shown.
  • the mandrel 8 is centered in a center hole 9 of the closed pressure plate 5 and cannot move even at high, eccentrically acting pressures.
  • Fig. 3 shows the upsetting of the flange at the start of the pressing process.
  • the material to be pressed flows over the mandrel 8 and completely fills out the insert tool, the die 4, which is closed by the closure plate.
  • the pressures are absorbed by the pressure plate 7 and the pressure ring 10.
  • the tool change is shown in FIG. 4.
  • the recipient 3 moves back with the mandrel 8 and the die 4 in the direction of the spar 11 or in the direction of the cylinder holder.
  • the tool package with the profiled pressure plate 7 which was previously in the waiting position now travels transversely to the extrusion direction in the pressing position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

1. A process for extrusion of hollow profiles, which show graduated cross sections along the profile length, whereas an ingot (1) with the extrusion die (2) is brought into a recipient (3) and is pressed over a mobile mandrel (8) by means of a hollow punch (12) through the die (4), characterized in that at the beginning of the extrusion, the mandrel (8) enters the closed ended die (4) ; that during the compression of the cross section enlargement, the hollow punch (12) allows the material to be extruded to flow over the mandrel (8) until the closed ended die (4) is completely filled ; that the recipient (3) with the mandrel (8) and the die (4) rebounds towards the drum holder, whereas a profiled pressure ring (10) in the direction of extrusion is positioned behind the die (4) into extrusion position and the cross section of the hollow profile is extruded by moving the hollow punch (12) ; that after the compression of the cross section enlargement and after moving of the recipient (3) with the die (4), the closing plate (5) is moved across the extrusion direction and is exchanged against a pressure plate (7) with profiled opening and, that the die (4) is in one part.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Strangpressen von Hohlprofilen, die aussen über die Profillänge abgestufte Querschnitte aufweisen, wobei ein Barren mit der Pressscheibe in einen Rezipienten eingebracht und über einen beweglichen Dorn mit Hilfe eines Hohlstempels durch eine Matrize gepresst wird.The invention relates to a method and a device for the extrusion of hollow profiles, which have graduated cross sections on the outside over the length of the profile, an ingot with the press disk being introduced into a recipient and pressed over a movable mandrel by means of a hollow punch through a die.

Die DE-C-969 393, insbesondere Figuren 1/2, beinhaltet einen zweistufigen Pressvorgang, nämlich Anstauchen einer Querschnittsvergrösserung mit endseitig verschlossener «Matrize» (5, 5') und anschliessendes Auspressen über die Matrize (4).DE-C-969 393, in particular FIGS. 1/2, contains a two-stage pressing process, namely compression of a cross-sectional enlargement with a “die” (5, 5 ') closed at the end and subsequent pressing out via the die (4).

Eine Metallstrangpresse zum Herstellen von Hohlprofilen, insbesondere aus Aluminium, ist nach DE-A-21 23 528 mit mehreren hintereinander lösbaren Matrizen ausgerüstet, die das Auspressen von abgesetzten Profilen ermöglichen. Zur Erzielung von innen abgesetzten Hohlprofilen ist der Dorn an seiner Spitze im Matrizenbereich abgesetzt und im Pressstempel längsbeweglich angeordnet. Um zugleich über die Profillänge aussen abgesetzte Hohlprofile herstellen zu können, sind mehrere hintereinander angeordnete lösbare Matrizen vorgesehen, die durch schräg nach aussen bewegliche Widerstandslager gehalten und freigegeben werden.According to DE-A-21 23 528, a metal extrusion press for producing hollow profiles, in particular made of aluminum, is equipped with a plurality of matrices that can be released one behind the other, which enable the pressing of offset profiles. In order to achieve recessed hollow profiles on the inside, the mandrel is set down at its tip in the die area and is arranged to be longitudinally movable in the press ram. In order at the same time to be able to produce hollow profiles that are set off from the outside over the length of the profile, a plurality of releasable matrices arranged one behind the other are provided, which are held and released by resistance bearings that can be moved obliquely outwards.

Die Herstellung und Verwendung von mehreren hintereinander angeordneten lösbaren Matrizen ist kompliziert und aufwendig. Durch die Teilung der Matrizen können Massungenauigkeiten und ein vorzeitiger Verschleiss auftreten.The production and use of a plurality of releasable matrices arranged one behind the other is complicated and expensive. Due to the division of the matrices, dimensional inaccuracies and premature wear can occur.

Aufgabe der vorliegenden Erfindung ist es, die beschriebenen Nachteile zu vermeiden und ein Verfahren sowie eine Vorrichtung zu entwickeln, die eine einfache, verschleissarme Herstellung von abgestuften Hohlprofilen hoher Masshaltigkeit ermöglicht.The object of the present invention is to avoid the disadvantages described and to develop a method and a device which enables simple, low-wear production of stepped hollow profiles of high dimensional accuracy.

Die Aufgabe wird erfindungsgemäss durch die in den unabhängigen Patentansprüchen angegebenen Merkmale gelöst. Die besonderen Vorteile des erfindungsgemässen Verfahrens sind folgende:

  • 1. die ungeteilte Matrize ermöglicht sehr hohe Pressdrücke bei sehr hohen Werkzeugstandzeiten,
  • 2. Verringerung der Werkzeugbewegung und daher beschleunigte Pressgeschwindigkeit bzw. beschleunigter Ablauf des gesamten Pressvorgangs,
  • 3. durch den beschleunigten Ablauf wird es erst möglich, auch abschreckempfindliche Legierungen für ein solches Verfahren einzusetzen,
  • 4. Einhaltung hoher Massgenauigkeit,
  • 5. Herstellung gratfreier Profile,
  • 6. beliebige Aussenkontur,
  • 7. die Presstemperaturen liegen im Bereich von 400 bis 560 °C bei Verwendung von AI-Legierungen,
  • 8. Legierungen des Typs: Rein-AI, AlMgSi, AIMg, AIMgMn, AICuMg, AlznMgCu u.a. können verwendet werden.
According to the invention, the object is achieved by the features specified in the independent patent claims. The particular advantages of the method according to the invention are as follows:
  • 1. the undivided die enables very high pressing pressures with very long tool life,
  • 2. Reduction of the tool movement and therefore accelerated pressing speed or accelerated execution of the entire pressing process,
  • 3. the accelerated process makes it possible to use quench sensitive alloys for such a process,
  • 4. Compliance with high dimensional accuracy,
  • 5. Production of burr-free profiles,
  • 6. any outside contour,
  • 7. the pressing temperatures are in the range from 400 to 560 ° C. when using Al alloys,
  • 8. Alloys of the type: pure Al, AlMgSi, AIMg, AIMgMn, AICuMg, AlznMgCu and others can be used.

Nach dem Anstauchen der Querschnittsvergrösserung und nach dem Verfahren des Rezipienten mit der Matrize wird die Verschlussplatte quer zur Strangrichtung verfahren und gegen eine Druckplatte mit profiliertem Durchbruch ausgewechselt. Durch die Querverfahrbarkeit wird ein beschleunigter Ablauf des Pressverfahrens ermöglicht, so dass auch abschreckempfindliche Legierungen, insbesondere vom Typ AIMgSi, AIMgMn, AICuMg, AIZnMgCu eingesetzt werden können.After the cross-sectional enlargement has been compressed and the recipient has moved with the die, the closure plate is moved transversely to the strand direction and replaced with a pressure plate with a profiled opening. The traversability enables an accelerated execution of the pressing process, so that quench sensitive alloys, in particular of the type AIMgSi, AIMgMn, AICuMg, AIZnMgCu can also be used.

Es wird eine einteilige Matrize im Werkzeugpaket verwendet. Dadurch kann eine grössere Masshaltigkeit und Werkzeugstandfestigkeit garantiert werden.A one-piece die is used in the tool package. This guarantees greater dimensional accuracy and tool stability.

Es ist vorteilhaft, dass ein Hohlbarren in den Rezipienten eingebracht wird, der ein Temperaturgefälle in Pressrichtung aufweist. Das Temperaturgefälle ist so auszubilden, dass die eingentliche Presstemperatur bei Verwendung von Aluminiumwerkstoffen zwischen 400 und 500 °C liegt.It is advantageous that a hollow bar is introduced into the recipient, which has a temperature gradient in the pressing direction. The temperature gradient must be designed so that the actual pressing temperature is between 400 and 500 ° C when using aluminum materials.

Es ist ferner besonders vorteilhaft, dass beim Pressbeginn der Dorn durch die Matrize in eine zentrische Verschlussstellung der geschlossenen Druckplatte (Verschlussplatte) einfährt. Die zentrische Verschlussstellung sorgt trotz hoher Pressdrücke dafür, dass die Aussenkontur des Hohlprofils absolut masshaltig bleibt.It is also particularly advantageous that the mandrel moves through the die into a central closed position of the closed pressure plate (closing plate) when the press begins. Despite the high pressing pressures, the central locking position ensures that the outer contour of the hollow profile remains absolutely true to size.

Das erfindungsgemässe Verfahren ermöglicht ferner die Verwendung einer einteiligen rotationssymetrischen Matrize. Dadurch werden die Werkzeugkosten herabgesetzt und der Festigkeitsverlauf innerhalb der Matrize günstig beeinflusst.The method according to the invention also enables the use of a one-part rotationally symmetrical die. This reduces tool costs and has a favorable influence on the strength curve within the die.

Es ist zweckmässig, dass die Matrize mit dem Rezipienten zusammen verfahrbar ist. Dadurch werden die Werkzeugbewegungen und die Nebenzeiten im Arbeitsablauf verringert und die Pressgeschwindigkeit erhöht.It is expedient that the matrix can be moved together with the recipient. This reduces tool movements and idle times in the workflow and increases the pressing speed.

Es ist ferner von besonderem Vorteil, dass in der Verschlussplatte eine Zentrierbohrung für den Dorn vorgesehen ist. Dadurch können Profile mit hoher Massgenauigkeit hergestellt werden, die eine gratfreie Oberfläche besitzen.It is also of particular advantage that a center hole for the mandrel is provided in the closure plate. This enables profiles with high dimensional accuracy to be produced that have a burr-free surface.

Ein Weiterbildungsmerkmal der erfindungsgemässen Vorrichtung ist es, dass der Dorn in Pressrichtung mindestens einen Dornabsatz aufweist, der eine Querschnittsverringerung gegenüber dem Dornausgangsdurchmesser von 30 bis 50% herbeiführt. Mit dieser Ausbildung des Dornabsatzes sind beliebige Konturen eines Hohlprofils bei hohen Umformgraden herstellbar.A further development feature of the device according to the invention is that the mandrel has at least one mandrel shoulder in the pressing direction, which brings about a reduction in cross-section compared to the mandrel outlet diameter of 30 to 50%. With this design of the mandrel shoulder, any contours of a hollow profile can be produced with high degrees of deformation.

Durch die besondere Konstruktion des erfindungsgemässen Werkzeugpakets ist die Matrize im Werkzeughalter bzw. im Druckring zentrierbar gelagert. Dies ist besonders wichtig, da bei einem Werkzeugwechsel ohne Zentrierbarkeit keine Masshaltigkeit der Profile gewährleistet ist.Due to the special construction of the tool package according to the invention, the die is centered in the tool holder or in the pressure ring. This is particularly important since the dimensional accuracy of the profiles is not guaranteed when changing tools without centering.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispieles näher erläutert. Es zeigen:

  • Fig. 1 = Teilquerschnitt durch die Strang- und Rohrpresse nach der Einfügung des Hohlbarrens vor Pressbeginn,
  • Fig. 2 = Teilquerschnitt nach Fig. 1 nach Einfahren des Domes,
  • Fig. 3 = Teilquerschnitt der Strangpresse beim Anstauchen des Flansches,
  • Fig. 4 = Prinzipbild beim Wechseln der Druckplatte,
  • Fig. 5 = Teilansicht der Strangpresse beim Anpressen des Rohres.
The invention is explained in more detail below using an exemplary embodiment. Show it:
  • 1 = partial cross section through the extrusion and tube press after the hollow bar has been inserted before the start of the press,
  • 2 = partial cross-section according to FIG. 1 after retracting the dome,
  • 3 = partial cross section of the extrusion press when compressing the flange,
  • 4 = basic diagram when changing the pressure plate,
  • Fig. 5 = partial view of the extrusion press when pressing the pipe.

Das Verfahren zum Strangpressen von Hohlprofilen beginnt damit, dass ein Barren, vorzugsweise ein Hohlbarren 1, mit der Pressscheibe 2 in den Rezipienten 3 eingebracht wird. Das Einsatzwerkzeug, bestehend aus einer ungeteilten Matrize 4, stützt sich in Pressstellung gegen eine geschlossene Druckplatte (Verschlussplatte 5) ab und ist in einem Werkzeughalter 6 befestigt. Das Werkzeugpaket mit der profilierten Druckplatte 7 befindet sich in Warteposition.The method for extruding hollow profiles begins with an ingot, preferably a hollow ingot 1, being introduced into the recipient 3 with the pressing disk 2. The insert tool, consisting of an undivided die 4, is supported in the pressed position against a closed pressure plate (closing plate 5) and is fastened in a tool holder 6. The tool package with the profiled pressure plate 7 is in the waiting position.

In Fig. 2 ist nun das Einfahren des Dornes in die Matrize dargestellt. Dabei wird der Dorn 8 in eine Zentrierbohrung 9 der geschlossenen Druckplatte 5 zentriert und kann selbst bei hohen, exzentrisch wirkenden Pressdrücken nicht abwandern.In Fig. 2 the insertion of the mandrel into the die is now shown. The mandrel 8 is centered in a center hole 9 of the closed pressure plate 5 and cannot move even at high, eccentrically acting pressures.

Fig. 3 zeigt das Anstauchen des Flansches beim Beginn des Pressvorganges. Das zu verpressende Material fliesst über den Dorn 8 und füllt das durch die Verschlussplatte geschlossene Einsatzwerkzeug, die Matrize 4, vollständig aus. Die Pressdrücke werden durch die Druckplatte 7 und den Druckring 10 aufgenommen.Fig. 3 shows the upsetting of the flange at the start of the pressing process. The material to be pressed flows over the mandrel 8 and completely fills out the insert tool, the die 4, which is closed by the closure plate. The pressures are absorbed by the pressure plate 7 and the pressure ring 10.

In Fig. 4 ist der Werkzeugwechsel dargestellt. Der Rezipient 3 fährt mit dem Dorn 8 und der Matrize 4 zurück in Richtung Laufholm 11 bzw. in Richtung Zylinderhalter. Das vorher in Warteposition befindliche Werkzeugpaket mit der profilierten Druckplatte 7 fährt nun quer zur Strangpressrichtung in Pressposition.The tool change is shown in FIG. 4. The recipient 3 moves back with the mandrel 8 and the die 4 in the direction of the spar 11 or in the direction of the cylinder holder. The tool package with the profiled pressure plate 7 which was previously in the waiting position now travels transversely to the extrusion direction in the pressing position.

Fig. 5 zeigt das Auspressen des Rohres durch Vorfahren des Hohlstempels 12 im Rezipienten 3.5 shows the pressing out of the tube by advancing the hollow punch 12 in the recipient 3.

Claims (9)

1. A process for extrusion of hollow profiles, which show graduated cross sections along the profile length, whereas an ingot (1) with the extrusion die (2) is brought into a recipient (3) and is pressed over a mobile mandrel (8) by means of a hollow punch (12) through the die (4), characterized in that at the beginning of the extrusion, the mandrel (8) enters the closed ended die (4); that during the compression of the cross section enlargement, the hollow punch (12) allows the material to be extruded to flow over the mandrel (8) until the closed ended die (4) is completely filled; that the recipient (3) with the mandrel (8) and the die (4) rebounds twoards the drum holder, whereas a profiled pressure ring (10) in the direction of extrusion is positioned behind the die (4) into extrusion position and the cross section of the hollow profile is extruded by moving the hollow punch (12); that after the compression of the cross section enlargement and after moving of the recipient (3) with the die (4), the closing plate (5) is moved across the extrusion direction and is exchanged against a pressure plate (7) with profiled opening and, that the die (4) is in one part.
2. A process according to claim 1, characterized in that a hollow ingot (1) is brought into the recipient (3) which shows a temperature gradient in the direction of extrusion.
3. A process according to one of the preceding claims, characterized in that while using ingots of aluminium alloys, the temperature of extrusion lies between 400 and 500 °C.
4. A process according to one of the preceding claims, characterized in that at the beginning of the extrusion, the mandrel (8) enters through the die (4) into centerable locking position of the closed pressure plate (closing plate 5).
5. A device for execution of the process according to one of the preceding claims, consisting of an extruder with press cylinder, an extrusion die, and a recipient (3), a mobile mandrel (8), and at least one die (4), characterized by placing a tool pack (14), consisting of a closing plate (5) and a pressure ring (10), between the die (4) and the counter pressure support (15), the tool pack (14) being displaceable crosswise to the extrusion direction, characterized further by using a one-part dynamically balanced die (4); characterized further by having an additional tool pack transferable into the position of the aforementioned tool pack (14) by shifting the latter crosswise out of the direction of the extrusion line and transferring the former crosswise into the extrusion line.
6. A device according to claim 5, characterized by having the die (4) movable jointly with the recipient (3).
7. A device according to claims 5 and 6, characterized by having a centering bore hole for the mandrel (8).
8. A device according to claims 5 to 7, characterized by the mandrel (8) having at least one extension (13) in the extrusion direction.
9. A device according to claims 5 to 8, characterized by the die (4) positioned centerably in the tool holder (6) or in the pressure ring (10).
EP84103929A 1983-06-18 1984-04-09 Method of and device for extruding hollow sections Expired EP0129010B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84103929T ATE30860T1 (en) 1983-06-18 1984-04-09 METHOD AND DEVICE FOR EXPRESSING HOLLOW PROFILES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3321957 1983-06-18
DE19833321957 DE3321957A1 (en) 1983-06-18 1983-06-18 METHOD AND DEVICE FOR EXTRUDING HOLLOW PROFILES

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EP0129010A2 EP0129010A2 (en) 1984-12-27
EP0129010A3 EP0129010A3 (en) 1985-07-10
EP0129010B1 true EP0129010B1 (en) 1987-11-19

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EP84103929A Expired EP0129010B1 (en) 1983-06-18 1984-04-09 Method of and device for extruding hollow sections

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AT (1) ATE30860T1 (en)
DE (1) DE3321957A1 (en)

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CN109332411B (en) * 2018-11-17 2023-09-15 太原科技大学 Tube extrusion forming device for continuous and repeated extrusion of nonferrous metal

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RU2509617C1 (en) * 2012-08-02 2014-03-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВПО МГТУ "СТАНКИН") Method of making hollow-profile metal articles

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DE3321957A1 (en) 1984-12-20
EP0129010A3 (en) 1985-07-10
EP0129010A2 (en) 1984-12-27
ATE30860T1 (en) 1987-12-15

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