EP0043335A1 - Apparatus for the continuous hot-forming of metallic pipe bends - Google Patents
Apparatus for the continuous hot-forming of metallic pipe bends Download PDFInfo
- Publication number
- EP0043335A1 EP0043335A1 EP81420095A EP81420095A EP0043335A1 EP 0043335 A1 EP0043335 A1 EP 0043335A1 EP 81420095 A EP81420095 A EP 81420095A EP 81420095 A EP81420095 A EP 81420095A EP 0043335 A1 EP0043335 A1 EP 0043335A1
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- European Patent Office
- Prior art keywords
- mandrel
- blanks
- ring
- rod
- diameter
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- 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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- 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
- B21D9/12—Bending tubes using mandrels or the like by pushing over a curved mandrel; by pushing through a curved die
Definitions
- the present invention relates to a device for continuously manufacturing hot tubular curves, in particular steel.
- metal curves are made from blanks or ferrules each consisting of a section of tube, the blanks being threaded in groups and pushed by a pushing means on a mandrel comprising a straight cylindrical rod extended at its end by a curved section.
- a heating means for example an electric inductor or a gas oven, being arranged substantially in the connection zone of the straight rod of the mandrel with the forming section.
- the blanks used are made of tubes manufactured in great length, then cut.
- the blanks threaded on the mandrel rod have variations in diameter and thickness with respect to the nominal dimensions, variations which result in play of varying importance between the internal diameter of the blank and the diameter of the mandrel rod. These clearances cause the blanks to appear on the rod, one behind the other, in a geometrically irregular manner, causing an irregularity in the conditions for transferring the thrust towards the part of the mandrel ensuring the forming.
- the object of the invention is precisely to provide a device making it possible to ensure good constant positioning of the blanks.
- the device according to the invention is essentially characterized by the fact that it comprises on the straight mandrel rod, upstream of the heating zone, a ring surrounding the mandrel rod and comprising at least one cylindrical seat whose diameter, greater the diameter of the mandrel rod is at least equal to the nominal internal diameter of the tubular blanks used.
- the ring can be produced in a single piece with the mandrel rod, preferably made by turning and attached around said rod.
- the cylindrical bearing surface of the ring is connected to the mandrel rod by frustoconical bearing surfaces.
- a cold plastic deformation is produced in the blanks pushed on the rod using a pusher means, around the ring which results in giving the blanks a constant internal diameter by compensating initial dimensional irregularities.
- the blanks which, after passing over the expansion ring, constitute a train of blanks in permanent compression between the forming-expansion zone of the mandrel and the expansion ring of the rod, are thus able to continue their journey towards the heating / forming zone of the mandrel while remaining perfectly aligned and centered on the rod.
- the diameter of the rod, in this part, between the expansion ring and the forming zone of the mandrel, can be different from that of the loose part of the rod, so as to reduce the play to a minimum and constant value .
- the presence of the ring according to the invention means that the blanks, advancing beyond said ring towards the heating and forming-expansion zone of the mandrel, are constantly kept pressed against each other by means of the sections d 'end and this, whether one exerts a push or not.
- This makes it possible, for example, to supply the machine with blanks, by stopping the thrust, without destroying the centering or the alignment of the blanks presenting themselves on heating.
- This maintenance in a centered position of the blanks, in the absence of thrust is due to the frictional forces on the ring and to the geometric constriction of the rod during the release of thrust, the whole allowing a sufficient tightening, the blanks between them for the hold in position.
- the length of the rod extending between the ring and the heating zone of the blanks is preferably long enough to avoid any noticeable thermal effect on the ring. This length therefore depends on the heating means used. Furthermore, the ring is arranged downstream of the pusher means
- the length of the cylindrical bearing surface of the ring is advantageously between approximately 0.5 and approximately 1.5 times the nominal diameter of the blanks used.
- the slope of the frustoconical bearing upstream is advantageously between approximately 7.5% and approximately 15% so as to facilitate the expansion of the metal in diameter and the slope of the frustoconical bearing downstream of the ring, that is to say -to say, in the direction of the heating device is advantageously between approximately 54 and approximately 7%.
- the mandrel comprises a straight cylindrical rod (1) of considerable length extended by a curved end portion of expansion and forming (2).
- a means for heating the blanks shown diagrammatically in the form of an inductor (3).
- the tubular blanks are threaded at the left end on the Figure 1 of the rod (1) and pushed using a conventional pusher means, not shown.
- an expansion ring for the blanks (4) being able to be produced integrally with the rod (1) or attached to it and comprising a cylindrical bearing surface (5) connecting to the rod (1) by frustoconical bearing surfaces (6) upstream and respectively (7) downstream.
- FIG. 2 illustrates a blank T threaded around the rod (1) and moved using a pusher means in the direction of the arrow (A), in the direction of the heating device (3) and of the forming area (2).
- the external diameter of the cylindrical section (5) being greater than the nominal internal diameter of the blanks (T) introduced, these being pushed are deformed cold on the ring (4) and continue their movement on the rod (1) having received an internal diameter as constant as possible, so that it can be precisely aligned and centered on the downstream part of the mandrel rod (1) avoiding any risk of jamming, creasing, tearing, entanglement and / or overlapping.
- the diameter of the mandrel rod (1) upstream and downstream of (4) is adjusted to the actual tolerances of the inside diameter of the blanks; thus, the diameter of the downstream part of the rod (1) will be greater than that of the upstream part of the rod (1) and the diameter of the downstream part will be calculated to have a minimum and regular clearance of the order of 5 to 10 / 10th of a mm on diameter, for example.
- the ring (4) is designed so as to allow the lubricant, which is inside the blanks (T) upstream of said ring, to pass downstream of (4) so that the blanks continue to be lubricated after passing over the ring.
- a preferred solution consists in cutting on the cylindrical part of (4) grooves (8), not parallel to the axis of the rod, but helical, for example, three or four in number.
- Such grooves (8) ensure continuity of the internal lubrication of the blanks, while avoiding any marking and / or deformation located on the inside of the blanks.
- an expansion ring is used, the cylindrical bearing of which has a diameter of 60 mm.
- the blanks have a length of 270 mm, the cylindrical bearing surface of the ring has a length of 55 mm, the frustoconical bearing upstream a length of 15 mm and a slope of 12.6% and the frustoconical bearing downstream a length of 15 mm and a slope of 6.6%:
- the diameter of the rod (1) upstream of the ring is 58; 1 mm and downstream of the ring is 59 mm.
- the length of the rod between the ring (4) and the inductor (3) is of the order of 1.5 m.
- a very high strength steel is used for the production of the expansion ring which is treated for example so as to reach a breaking load of the order of 2200 MPa.
- An advantageous embodiment consists in using an expansion ring which is threaded on an internal diameter.
- the mandrel then comprises a rod produced in two parts which are assembled end to end by screwing inside the expansion ring, which therefore plays the role of junction piece at the same time. It is thus easy to change the ring when it is worn.
Abstract
Description
La présente invention est relative à un dispositif de fabrication à chaud en continu de courbes tubulaires, en particulier, en acier. On fabrique traditionnellement des courbes métalliques à partir d'ébauches ou viroles constituées chacune d'un tronçon de tube, les ébauches étant enfilées par groupes et poussées par un moyen pousseur sur un mandrin comportant une tige cylindrique droite prolongée à son extrémité par un tronçon courbe de formage sur lequel sont réalisés une expansion et un cintrage de l'ébauche jusqu'à la forme de la courbe désirée, un moyen de chauffage, par exemple un inducteur électrique ou un four à gaz, étant disposé sensiblement dans la zone de raccordement de la tige droite du mandrin avec le tronçon de formage. Les ébauches utilisées sont constituées de tubes fabriqués en grande longueur, puis tronçonnés.The present invention relates to a device for continuously manufacturing hot tubular curves, in particular steel. Traditionally, metal curves are made from blanks or ferrules each consisting of a section of tube, the blanks being threaded in groups and pushed by a pushing means on a mandrel comprising a straight cylindrical rod extended at its end by a curved section. forming on which are carried out an expansion and a bending of the blank to the shape of the desired curve, a heating means, for example an electric inductor or a gas oven, being arranged substantially in the connection zone of the straight rod of the mandrel with the forming section. The blanks used are made of tubes manufactured in great length, then cut.
Dans la pratique, il en résulte que les ébauches enfilées sur la tige de-mandrin présentent des variations en diamètre et en épaisseur par rapport aux cotes nominalês, variations qui se-traduisent par des jeux d'importance variable entre le diamètre intérieur de l'ébauche et le diamètre de la tige de mandrin. Ces jeux font que les ébauches se présentent sur la tige, les unes derrière les autres, de façon géométriquement irrégulière, entraînant une irrégularité des conditions de transfert de la poussée vers la partie du mandrin assurant le formage.In practice, it follows that the blanks threaded on the mandrel rod have variations in diameter and thickness with respect to the nominal dimensions, variations which result in play of varying importance between the internal diameter of the blank and the diameter of the mandrel rod. These clearances cause the blanks to appear on the rod, one behind the other, in a geometrically irregular manner, causing an irregularity in the conditions for transferring the thrust towards the part of the mandrel ensuring the forming.
Or, dans la pratique, pour un bon fonctionnement de l'installation et pour l'obtention de courbes tubulaires de qualités métallurgiques et dimensionnelles, aussi bonnes et constantes que possible, il est nécessaire que les ébauches soient parfaitement alignées et centrées par rapport à l'axe de la tige de mandrin en amont de la partie où s'effectuent le formage et le chauffage. Il importe, en particulier, que chaque section d'extrémité d'ébauche se juxtapose à la section correspondante de l'ébauche suivante ou précédente, avec laquelle elle est en contact.However, in practice, for proper operation of the installation and for obtaining tubular curves of metallurgical and dimensional qualities, as good and constant as possible, it is necessary that the blanks are perfectly aligned and centered with respect to the 'axis of the mandrel rod upstream of the part where the forming and heating takes place. It is particularly important that each blank end section is juxtaposed with the corresponding section of the next or previous blank, with which it is in contact.
Il faut notamment éviter la -superposition partielle des surfaces, qui peut, compte tenu des pressions de poussée exercées pour le procédé (pressions qui peuvent être de l'ordre de 200 MPa) entraîner des détériorations et même des enchevêtrements des ébauches sur deux extrémités successives en contact par poussée et, de toute façon, conduire à une pression répartie irrégulièrement sur la périphérie de la section de l'ébauche ou des ébauches en cours de chauffage et formage par expansion et cintrage.It is particularly necessary to avoid the partial superimposition of the surfaces, which can, taking into account the thrust pressures exerted for the process (pressures which can be of the order of 200 MPa), cause deterioration and even tangles of the blanks out of two. successive ends in contact by pushing and, in any case, leading to a pressure distributed irregularly over the periphery of the section of the blank or the blanks during heating and forming by expansion and bending.
L'invention a précisément pour but de fournir un dispositif permettant d'assurer un bon positionnement constant des ébauches.The object of the invention is precisely to provide a device making it possible to ensure good constant positioning of the blanks.
Le dispositif selon l'invention se caractérisé essentiellement par le fait qu'il comprend sur la tige droite de mandrin, en amont de la zone de chauffage, une bague entourant la tige de mandrin et comportant au moins une portée cylindrique dont le diamètre, supérieur au diamètre de la tige de mandrin, est au moins égal au diamètre intérieur nominal des ébauches tubulaires utilisées. La bague peut être réalisée d'un seul tenant avec la tige de mandrin du-de préférence être réalisée par décolletage et rapportée autour de ladite tige. De préférence, la portée cylindrique de la bague se raccorde à la tige de mandrin par des portées tronconiques.The device according to the invention is essentially characterized by the fact that it comprises on the straight mandrel rod, upstream of the heating zone, a ring surrounding the mandrel rod and comprising at least one cylindrical seat whose diameter, greater the diameter of the mandrel rod is at least equal to the nominal internal diameter of the tubular blanks used. The ring can be produced in a single piece with the mandrel rod, preferably made by turning and attached around said rod. Preferably, the cylindrical bearing surface of the ring is connected to the mandrel rod by frustoconical bearing surfaces.
Grâce à la bague selon l'invention, on réalise dans les ébauches poussées sur la tige à l'aide d'un moyen pousseur, autour de la bague, une déformation plastique à froid qui conduit à donner aux ébauches un diamètre intérieur constant en compensant les irrégularités dimensionnelles initiales.Thanks to the ring according to the invention, a cold plastic deformation is produced in the blanks pushed on the rod using a pusher means, around the ring which results in giving the blanks a constant internal diameter by compensating initial dimensional irregularities.
Les ébauches qui, après passage sur la bague d'expansion, constituent un train d'ébauches en compression permanente entre la zone de formage-expansion du mandrin et la bague d'expansion de la tige, sont ainsi en mesure de poursuivre leur trajet vers la zone de chauffage/ formage du mandrin en restant parfaitement alignées et centrées sur la tige.The blanks which, after passing over the expansion ring, constitute a train of blanks in permanent compression between the forming-expansion zone of the mandrel and the expansion ring of the rod, are thus able to continue their journey towards the heating / forming zone of the mandrel while remaining perfectly aligned and centered on the rod.
Le diamètre de la tige, dans cette partie, entre la bague d'expansion et la zone de formage du mandrin, peut être différent"'de celui de la partie amohtde la tige, de façon à réduire le jeu à une valeur minimale et constante.The diameter of the rod, in this part, between the expansion ring and the forming zone of the mandrel, can be different from that of the loose part of the rod, so as to reduce the play to a minimum and constant value .
La présence de la bague selon l'invention fait que les ébauches, avançant au-delà de ladite bague vers la zone de chauffage et de formage-expansion du mandrin, sont constamment maintenues pressées les unes contre les autres par l'intermédiaire des sections d'extrémité et ceci, que'l'on exerce une poussée ou non. Cela permet, par exemple, d'alimenter en ébauches la machine, en arrêtant la poussée, sans détruire le centrage ni l'alignement des ébauches se présentant au chauffage. Ce maintien en position centrée des ébauches, en l'absence de poussée, est dû aux forces de frottement sur la bague et au rétreint géométrique de la tige lors du relâchement de poussée, le tout permettant un serrage suffisant,des ébauches entre elles pour les maintenir en position.The presence of the ring according to the invention means that the blanks, advancing beyond said ring towards the heating and forming-expansion zone of the mandrel, are constantly kept pressed against each other by means of the sections d 'end and this, whether one exerts a push or not. This makes it possible, for example, to supply the machine with blanks, by stopping the thrust, without destroying the centering or the alignment of the blanks presenting themselves on heating. This maintenance in a centered position of the blanks, in the absence of thrust, is due to the frictional forces on the ring and to the geometric constriction of the rod during the release of thrust, the whole allowing a sufficient tightening, the blanks between them for the hold in position.
On s'arrange toujours pour que la longueur de la tige s'étendant entre le bague et la zone de chauffage des ébauches, soit de préférence suffisamment longue pour éviter tout effet thermique notable sur la bague. Cette longueur est donc fonction des moyens de chauffage utilisés. Par ailleurs, la bague est disposée en aval du moyen pousseurIt is always arranged that the length of the rod extending between the ring and the heating zone of the blanks is preferably long enough to avoid any noticeable thermal effect on the ring. This length therefore depends on the heating means used. Furthermore, the ring is arranged downstream of the pusher means
le plus près possible de l'extrémité de ce moyen dans sa position la plus avancée.as close as possible to the end of this means in its most advanced position.
La longueur de la portée cylindrique de la bague est avantageusement comprise entre environ 0,5 et environ 1,5 fois le diamètre nominal des ébauches utilisées. La pente de la portée tronconique en amont est avantageusement comprise entre environ 7,5% et environ 15% de façon à faciliter l'expansion du métal en diamètre et la pente de la portée tronconique en aval de la bague, c'est-à-dire, en direction du dispositif de chauffage est avantageusement comprise entre environ 54 et environ 7%.The length of the cylindrical bearing surface of the ring is advantageously between approximately 0.5 and approximately 1.5 times the nominal diameter of the blanks used. The slope of the frustoconical bearing upstream is advantageously between approximately 7.5% and approximately 15% so as to facilitate the expansion of the metal in diameter and the slope of the frustoconical bearing downstream of the ring, that is to say -to say, in the direction of the heating device is advantageously between approximately 54 and approximately 7%.
Dans le but de mieux faire comprendre l'invention, on va maintenant décrire à titre d'exemple, en aucune manière limitatif, un mode de réalisation en se référant au dessin annexé, dans lequel :
- - la figure 1 représente schématiquement le dispositif selon l'invention,
- - la figure 2 illustre de façon agrandie la bague et la tige de mandrin sur laquelle sont enfilées les ébauches.
- FIG. 1 diagrammatically represents the device according to the invention,
- - Figure 2 illustrates in an enlarged manner the ring and the mandrel rod on which are threaded the blanks.
Le mandrin comporte une tige (1) cylindrique droite de longueur importante prolongée par une partie d'extrémité courbe d'expansion et de formage (2).The mandrel comprises a straight cylindrical rod (1) of considerable length extended by a curved end portion of expansion and forming (2).
A l'extrémité de la tige de mandrin (1) est prévu un moyen de chauffage des ébauches, schématisé sous la forme d'un inducteur (3). Les ébauches tubulaires sont enfilées à l'extrémité de gauche sur la figure 1 de la tige (1) et poussées à l'aide d'un moyen pousseur conventionnel, non représenté.At the end of the mandrel rod (1) is provided a means for heating the blanks, shown diagrammatically in the form of an inductor (3). The tubular blanks are threaded at the left end on the Figure 1 of the rod (1) and pushed using a conventional pusher means, not shown.
Selon l'invention, il est prévu sur la tige (1) une bague d'expansion des ébauches (4), ladite bague pouvant être réalisée d'un seul tenant avec la tige (1) ou rapportée sur celle-ci et comprenant une portée cylindrique (5) se raccordant à la tige (1) par des portées tronconiques (6) en amont et respectivement (7) en aval.According to the invention, there is provided on the rod (1) an expansion ring for the blanks (4), said ring being able to be produced integrally with the rod (1) or attached to it and comprising a cylindrical bearing surface (5) connecting to the rod (1) by frustoconical bearing surfaces (6) upstream and respectively (7) downstream.
Les proportions dans la figure ont été largement exagérées, en particulier, au niveau de la bague (4), pour rendre bien visible cet élément de l'invention.The proportions in the figure have been greatly exaggerated, in particular, at the level of the ring (4), to make this element of the invention clearly visible.
On a illustré sur la figure 2 une ébauche T enfilée autour-de la tige (1) et déplacée à l'aide d'un moyen pousseur dans le sens de la flèche (A), en direction du dispositif de chauffage (3) et de la zone de formage (2).FIG. 2 illustrates a blank T threaded around the rod (1) and moved using a pusher means in the direction of the arrow (A), in the direction of the heating device (3) and of the forming area (2).
Le diamètre extérieur du tronçon cylindrique (5) étant supérieur au diamètre intérieur nominal des ébauches (T) introduites, celles-ci en étant poussées se déforment à froid sur la bague (4) et continuent leur déplacement sur la tige (1) en ayant reçu un diamètre intérieur aussi constant que possible, de manière à pouvoir être précisément alignées et centrées sur la partie aval de la tige (1) de mandrin évitant tout risque de coincement, pli, déchirement, enchevêtrement et/ou chevauchement.The external diameter of the cylindrical section (5) being greater than the nominal internal diameter of the blanks (T) introduced, these being pushed are deformed cold on the ring (4) and continue their movement on the rod (1) having received an internal diameter as constant as possible, so that it can be precisely aligned and centered on the downstream part of the mandrel rod (1) avoiding any risk of jamming, creasing, tearing, entanglement and / or overlapping.
Il en résulte alors des conditions de poussée, de répartition de pression et de déformation à chaud, régulières assurant une constance des qualités métallurgiques et dimensionnelles des courbes fabriquées. Le fait de déformer une ébauche, dont les dimensions ont été préalablement standardisées, ne peut avoir qu'un effet favorable sur la qualité des produits obtenus.This then results in conditions of thrust, pressure distribution and hot deformation, regular ensuring consistency of the metallurgical and dimensional qualities of the manufactured curves. The deformation of a blank, the dimensions of which have been previously standardized, can only have a favorable effect on the quality of the products obtained.
Le diamètre de la tige (1) de mandrin en amont et en aval de (4) est ajusté aux tolérances réelles du diamètre intérieur des ébauches ; ainsi, le diamètre de la partie aval de la tige (1) sera supérieur à celui de la partie amont de la tige (1) et on calculera le diamètre de la partie aval pour avoir un jeu minimal et régulier de l'ordre de 5 à 10/10ème de mm sur diamètre, par exemple.The diameter of the mandrel rod (1) upstream and downstream of (4) is adjusted to the actual tolerances of the inside diameter of the blanks; thus, the diameter of the downstream part of the rod (1) will be greater than that of the upstream part of the rod (1) and the diameter of the downstream part will be calculated to have a minimum and regular clearance of the order of 5 to 10 / 10th of a mm on diameter, for example.
Par ailleurs, la bague (4) est conçue de façon à permettre au lubrifiant, qui se trouve à l'intérieur des ébauches (T) en amont de ladite bague, de passer en aval de (4) pour que les ébauches continuent à être lubrifiées après leur passage sur la bague.Furthermore, the ring (4) is designed so as to allow the lubricant, which is inside the blanks (T) upstream of said ring, to pass downstream of (4) so that the blanks continue to be lubricated after passing over the ring.
A cet effet, une solution préférentielle consiste à tailler sur la partie cylindrique de (4) des saignées (8), non parallèles à l'axe de la tige, mais hélicoïdales, par exemple, au nombre de trois ou quatre. De telles saignées (8) permettent d'assurer la continuité de la lubrification interne des ébauches, tout en évitant tout marquage et/ou déformation localisé sur l'intérieur des ébauches.To this end, a preferred solution consists in cutting on the cylindrical part of (4) grooves (8), not parallel to the axis of the rod, but helical, for example, three or four in number. Such grooves (8) ensure continuity of the internal lubrication of the blanks, while avoiding any marking and / or deformation located on the inside of the blanks.
Dans un exemple particulier de réalisation, pour fabriquer des courbes à partir d'ébauches présentant un diamètre extérieur de 66 millimètres et une épaisseur de 3,2 millimètres, c'est-à-dire, présentant un diamètre intérieur nominal de 59,6 millimètres, on utilise une bague d'expansion dont la portée cylindrique présente un diamètre de 60 mm. Les ébauches présentent une longueur de 270 mm, la portée cylindrique de la bague présente une longueur de 55 mm, la portée tronconique en amont une longueur de 15 mm et une pente de 12,6 % et la portée tronconique en aval une longueur de 15 mm et une pente de 6,6%: Le diamètre de la tige (1) en amont de la bague est de 58;1 mm et en aval de la bague est de 59 mm. La longueur de la tige entre la bague (4) et l'inducteur (3) est de l'ordre de 1,5 m. Comme il a été expliqué, tout flottement des ébauches dans cette zone est évité, même en l'absence de poussée.In a particular embodiment, to make curves from blanks having an outside diameter of 66 millimeters and a thickness of 3.2 millimeters, that is to say, having a nominal inside diameter of 59.6 millimeters , an expansion ring is used, the cylindrical bearing of which has a diameter of 60 mm. The blanks have a length of 270 mm, the cylindrical bearing surface of the ring has a length of 55 mm, the frustoconical bearing upstream a length of 15 mm and a slope of 12.6% and the frustoconical bearing downstream a length of 15 mm and a slope of 6.6%: The diameter of the rod (1) upstream of the ring is 58; 1 mm and downstream of the ring is 59 mm. The length of the rod between the ring (4) and the inductor (3) is of the order of 1.5 m. As explained, any floating of the blanks in this area is avoided, even in the absence of thrust.
On utilise de préférence pour la réalisation de la bague d'expansion un acier à très haute résistance qui est traité par exemple de façon à atteindre une charge de rupture de l'ordre de 2200 MPa.Preferably, a very high strength steel is used for the production of the expansion ring which is treated for example so as to reach a breaking load of the order of 2200 MPa.
On préfère en général utiliser pour le mandrin un acier de caractéristiques mécaniques moins élevées.It is generally preferred to use steel with lower mechanical characteristics for the mandrel.
Un mode de réalisation avantageux, consiste à utiliser une bague d'expansion qui est filetée sur scndiamètre intérieur. Le mandrin comporte alors une tige réalisée en deux parties qu'on assemble bout à bout par vissage à l'intérieur de la bague d'expansion, qui joue donc en même temps le rôle de pièce de jonction. Il est ainsi facile de changer la bague lorsqu'elle est usée.An advantageous embodiment consists in using an expansion ring which is threaded on an internal diameter. The mandrel then comprises a rod produced in two parts which are assembled end to end by screwing inside the expansion ring, which therefore plays the role of junction piece at the same time. It is thus easy to change the ring when it is worn.
Bien que l'invention ait été décrite en liaison avec un mode de réalisation particulier, il est bien évident qu'elle n'y est nullement limitée et qu'on peut lui apporter de nombreuses variantes et modifications, sans pour autant sortir ni de son cadre, ni de son aspect.Although the invention has been described in connection with a particular embodiment, it is obvious that it is in no way limited thereto and that it can be brought to numerous variants and modifications, without however departing from or frame, or its appearance.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT81420095T ATE5952T1 (en) | 1980-06-27 | 1981-06-26 | DEVICE FOR CONTINUOUS HOT FORMING OF METALLIC PIPE BENDS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8014362A FR2485409A1 (en) | 1980-06-27 | 1980-06-27 | DEVICE FOR CONTINUOUS HOT MANUFACTURE OF TUBULAR METAL CURVES |
| FR8014362 | 1980-06-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0043335A1 true EP0043335A1 (en) | 1982-01-06 |
| EP0043335B1 EP0043335B1 (en) | 1984-01-25 |
Family
ID=9243604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81420095A Expired EP0043335B1 (en) | 1980-06-27 | 1981-06-26 | Apparatus for the continuous hot-forming of metallic pipe bends |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0043335B1 (en) |
| AT (1) | ATE5952T1 (en) |
| DE (1) | DE3162026D1 (en) |
| FR (1) | FR2485409A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116586527A (en) * | 2023-07-18 | 2023-08-15 | 盐山亚汇管业有限公司 | Elbow pushing device and process convenient for feeding |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE583550C (en) * | 1931-03-28 | 1933-09-05 | Rohrbogenwerk G M B H | Process for the production of elbows |
| DE573890C (en) * | 1931-04-25 | 1933-10-10 | Rohrbogenwerk G M B H | Process for the production of pipe bends or the like. |
| US2105075A (en) * | 1935-10-08 | 1938-01-11 | Tube Turns Inc | Method and apparatus for making pipe bends |
| DE658010C (en) * | 1935-01-29 | 1938-03-19 | Mannesmann Ag | Method for bending pipe bends or the like with straight legs |
| DE1056905B (en) * | 1957-10-23 | 1959-05-06 | Kocks Gmbh Friedrich | Method of bending pipes |
-
1980
- 1980-06-27 FR FR8014362A patent/FR2485409A1/en active Granted
-
1981
- 1981-06-26 EP EP81420095A patent/EP0043335B1/en not_active Expired
- 1981-06-26 DE DE8181420095T patent/DE3162026D1/en not_active Expired
- 1981-06-26 AT AT81420095T patent/ATE5952T1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE583550C (en) * | 1931-03-28 | 1933-09-05 | Rohrbogenwerk G M B H | Process for the production of elbows |
| DE573890C (en) * | 1931-04-25 | 1933-10-10 | Rohrbogenwerk G M B H | Process for the production of pipe bends or the like. |
| DE658010C (en) * | 1935-01-29 | 1938-03-19 | Mannesmann Ag | Method for bending pipe bends or the like with straight legs |
| US2105075A (en) * | 1935-10-08 | 1938-01-11 | Tube Turns Inc | Method and apparatus for making pipe bends |
| DE1056905B (en) * | 1957-10-23 | 1959-05-06 | Kocks Gmbh Friedrich | Method of bending pipes |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116586527A (en) * | 2023-07-18 | 2023-08-15 | 盐山亚汇管业有限公司 | Elbow pushing device and process convenient for feeding |
| CN116586527B (en) * | 2023-07-18 | 2023-09-05 | 盐山亚汇管业有限公司 | Elbow pushing device and process convenient for feeding |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3162026D1 (en) | 1984-03-01 |
| FR2485409B1 (en) | 1982-08-20 |
| FR2485409A1 (en) | 1981-12-31 |
| ATE5952T1 (en) | 1984-02-15 |
| EP0043335B1 (en) | 1984-01-25 |
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