EP0043750A1 - Apparatus for forming tubes of small diameter - Google Patents

Apparatus for forming tubes of small diameter Download PDF

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Publication number
EP0043750A1
EP0043750A1 EP19810401002 EP81401002A EP0043750A1 EP 0043750 A1 EP0043750 A1 EP 0043750A1 EP 19810401002 EP19810401002 EP 19810401002 EP 81401002 A EP81401002 A EP 81401002A EP 0043750 A1 EP0043750 A1 EP 0043750A1
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EP
European Patent Office
Prior art keywords
forming
roller
jaws
jaw
frame
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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.)
Ceased
Application number
EP19810401002
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German (de)
French (fr)
Inventor
Jean-Pierre Loizon
Jean Rousselin
Christian Souvant
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ETS Y JOUANEL SA
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ETS Y JOUANEL SA
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Publication date
Application filed by ETS Y JOUANEL SA filed Critical ETS Y JOUANEL SA
Publication of EP0043750A1 publication Critical patent/EP0043750A1/en
Ceased legal-status Critical Current

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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
    • B21D5/143—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers making use of a mandrel

Definitions

  • the present invention relates to a machine for forming small diameter pipes.
  • the invention applies more particularly to the forming of pipes by rolling.
  • the rolling diameter is of the order of three to four times the diameter of the forming roller which, of course, does not may fall below a minimum value of the order of 80 to 100 mm.
  • the minimum rolling diameter is between approximately 250 and 400 mm, which excludes the formation of small diameter pipes, in particular less than 100 mm.
  • the forming is carried out by a forming roller of small diameter strongly applied on a large roller coated with polyurethane. With this machine, tubes of diameter between 100 and 130 mm can be obtained.
  • the forming is carried out by three polyurethane rollers, also distributed in a triangle around a forming roller of small diameter, this machine making it possible to obtain tubes of good cylindricity but whose minimum rolling diameter is determined by the diameter of the polyurethane pressure rollers which come into mutual contact when descending into small diameters.
  • the drive is carried out by the lower rollers, the central roller being simply mounted floating.
  • the upper rollers are mounted on a sliding support and to move the central roller it is advisable act by pressing it by one of the upper rollers.
  • the object of the present invention is to provide a machine making it possible to form pipes of small diameter, in particular less than 100 mm, with perfect cylindricity, said machine having to be robust and of low production cost.
  • the machine for forming pipes of small diameter in particular by rolling, comprises a frame, a forming roller rotatably mounted on the frame, means for driving said roller in rotation, forming jaws arranged around the roller. former and means for moving said jaws relative to the roller, these two jaws being diametrically opposite with respect to the forming roller, one being mounted fixed and the other movable on the frame, the forming roller being pivotally mounted on the frame so as to be able to move away from the fixed jaw.
  • the movable jaw is carried by at least one support provided with actuating means and said support is pivotally mounted on the frame;
  • the movable jaw supports are levers carrying the jaw at one end and the actuation means are jacks connected to the other end of said levers;
  • the machine comprises adjustment slides in which the forming jaws are slidably mounted and means for adjusting the spacing of the jaws are associated with said slides;
  • each forming jaw is formed from a block rigid extending along the forming roller over substantially its entire length and each jaw has a V-groove opening towards the forming roller;
  • the forming roller is provided with means for hooking the edge of a sheet to be formed and these means comprise a longitudinal tangential slot, penetrating into the pressing roller.
  • the machine comprises a frame 1 on which is mounted a rotary forming roller 2 extending over the entire length of said frame and projecting laterally in overhang on one side thereof, said roller being articulated on the frame around a horizontal axis 4 and having its cantilevered end mounted in a fixed bearing 5 fixed at the end of an arm 3 extending in the extension of the roller 2.
  • the forming roller 2 essentially consists, conventionally, of a central forming mandrel 9 which extends along the frame 1 between a removable lateral bearing 10 situated on the right in FIG. 1 and a rotary sleeve 11 on the left in which the corresponding end of the mandrel is fitted and keyed, said sleeve 11 forming the part of the roller located in a cantilever articulated around the axis 4 and mounted in the fixed bearing 5 On this sleeve 11 is keyed a toothed wheel 12 which meshes with a complementary wheel 13 mounted on the output shaft of a geared motor group 14.
  • These toothed wheels 12 and 13 have a sufficient toothing module to allow the mandrel to be raised by more or less deep engagement of the teeth between them.
  • a slide 15 which extends over the entire width of said frame, and in which is slidably mounted upwards a so-called fixed jaw 16 movable vertically and resting horizontally at the end on two lower adjustment screws 17 and 18 crossing perpendicularly the table of the frame 1 and screwed into it.
  • the fixed jaw 16 extends under the forming mandrel 9 and directly above it while above said mandrel, and in a position diametrically opposite to that of the fixed jaw, extends a movable jaw upper 19 slidingly mounted at its two ends in vertical slides 20 and 21 supported vertically above the mandrel 9 by lever-shaped supports 22 articulated around horizontal axes 23 at the upper end of vertical uprights 24 fixed on the frame table 1.
  • the ends of the levers 22 opposite the slides with respect to the articulation axes 23 are articulated by means of horizontal axes 25 and yokes 26 at the upper end of actuator rods 27 and 28 for actuating the movable jaw oriented vertically and articulated at their base on the frame 1.
  • the movable jaw 19 is supported at its two ends, plumb with the mandrel 9, by vertical screws for adjusting the spacing of the jaws 29 and 30 which pass through the bottom of the slides 20 and 21 and are screwed therein.
  • the two fixed 16 and movable jaws 19 both have a longitudinal V-shaped groove, respectively 31 and 32, the inclined sides of which extend parallel to the mandrel which they envelop.
  • the opening angle of the V of the grooves of the two jaws is chosen between 90 and 120 ° but, of course, this choice is not imperative.
  • the mandrel 9 has a tangential slot 33 (FIG. 3) extending parallel to the axis of the mandrel over the entire length of the jaws 16 and 19.
  • a sheet previously cut to the dimensions of the pipe to be rolled is presented along the mandrel 2 of the machine and the front edge of said sheet is engaged in the tangential slot 33 of the mandrel.
  • the latter is then driven in rotation by the geared motor 14 via the two toothed wheels 12 and 13, and the sleeve 11 carrying with it the sheet which is forced to pass between said mandrel and the sides of the grooves in V 31 and 32 of the two jaws 16 and 19.
  • the rolling of the sheet between the mandrel 2 and the sides of the V-grooves of the two jaws 16 and 19 ensures the bending and winding of said sheet around the mandrel.
  • the bearing 10 is disassembled and opened to release the end of the mandrel 2 and the rod of the lateral jack 7 is retracted ensuring the lifting of the mandrel 2 above the fixed jaw 16 thus allowing disengagement by sliding the tube laterally from the side of the machine opposite to the gear motor 14 and to the jack 7.
  • the machine according to the invention makes it possible to produce tubes with a diameter of less than 100 mm with perfect cylindricity and a production rate higher than that obtained on currently known machines.
  • the system according to the invention also makes it possible to form a large number of tube diameters with the same mandrel.
  • a forming machine according to the invention can have a number of jaws greater than two or the groove formed in said jaws can have a section of shape different from a V such as for example a semi-circular shape.
  • actuating cylinders for opening and closing the jaws and the actuator for lifting the mandrel 2 can be replaced by any equivalent means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

The apparatus comprises a support stand (1) equipped with a transverse table supporting a fixed lower jaw (16) and a movable upper jaw (19) between which is rotatably mounted a split forming mandrel (9) driven in rotation by means of two gear wheels (12 and 13) and a gear motor set (14), the adjustment of the separation of the jaws (16 and 19) in relation to the mandrel (9) being ensured respectively by screws (17, 18 and 29, 30) while the jacks (27 and 28) ensure the opening and the closing of the said jaws. Application for forming tubes of diameter less than 100 mm. <IMAGE>

Description

La présente invention concerne une machine à former des tuyaux de faible diamètre.The present invention relates to a machine for forming small diameter pipes.

L'invention s'applique plus particulièrement au formage de tuyaux par roulage.The invention applies more particularly to the forming of pipes by rolling.

Actuellement, le formage de tuyaux par roulage s'effectue à l'aide de rouleaux formeurs soutenus à leurs extrémités sans possibilité de les renforcer dans leur partie médiane. Au cours du travail de roulage et compte tenu des efforts importants mis en jeu, les rouleaux de travail fléchissent et il est difficile d'obtenir des tuyaux parfaitement cylindriques surtout dans les petits diamètres .Currently, the forming of pipes by rolling is carried out using rollers supported at their ends without the possibility of strengthening them in their middle part. During the rolling work and taking into account the significant efforts involved, the working rollers flex and it is difficult to obtain perfectly cylindrical pipes, especially in small diameters.

Diverses solutions ont été déjà proposées pour résoudre ce problème de flambage des rouleaux formeurs et pour compenser la flexion de ceux-ci. Une première solution a consisté à leur donner une forme bombée mais ceci n'est qu'un pis-aller et les résultats obtenus sont loin d'être totalement satisfaisants.Various solutions have already been proposed to solve this problem of buckling of the forming rollers and to compensate for the bending of these. A first solution consisted in giving them a rounded shape but this is only a last resort and the results obtained are far from being completely satisfactory.

Dans une machine à rouler connue dite "rou- leuse pyramidale", et qui comporte trois rouleaux disposés en forme de pyramide, le diamètre de roulage est de l'ordre de trois à quatre fois le diamètre du rouleau formeur qui, bien entendu, ne peut descendre en dessous d'une valeur minimum de l'ordre de 80 à 100 mm. Il en résulte que le diamètre minimum de roulage se situe entre environ 250 et 400 mm, ce qui exclut la formation de tuyaux de faible diamètre, inférieur notamment à 100 mm.In a known rolling machine known as a "pyramidal rolling machine", and which comprises three rollers arranged in the shape of a pyramid, the rolling diameter is of the order of three to four times the diameter of the forming roller which, of course, does not may fall below a minimum value of the order of 80 to 100 mm. As a result, the minimum rolling diameter is between approximately 250 and 400 mm, which excludes the formation of small diameter pipes, in particular less than 100 mm.

Avec les rouleuses planeuses connues actuellement on obtient de meilleurs résultats du fait que le diamètre minimum de roulage est compris entre 1/2 et 2 fois le diamètre du rouleau planeur. Avec ces machines, on arrive à descendre à des diamètres minimum de tubes compris entre 120 et 150 mm.With the currently known leveling rollers, better results are obtained because the minimum rolling diameter is between 1/2 and 2 times the diameter of the leveling roller. With these machines, we can get down to diameters minimum of tubes between 120 and 150 mm.

Selon une autre machine également connue, le formage est effectué par un rouleau formeur de petit diamètre fortement appliqué sur un gros rouleau enrobé de polyuréthane. Avec cette machine, on peut obtenir des tubes de diamètre compris entre 100 et 130 mm.According to another also known machine, the forming is carried out by a forming roller of small diameter strongly applied on a large roller coated with polyurethane. With this machine, tubes of diameter between 100 and 130 mm can be obtained.

Enfin, selon une dernière machine connue, le formage est effectué par trois rouleaux en polyuréthane, également répartis en triangle autour d'un rouleau formeur de petit diamètre, cette machine permettant d'obtenir des tubes de bonne cylindricité mais dont le diamètre minimum de roulage est déterminé par le diamètre des rouleaux presseurs en polyuréthane qui viennent en contact mutuel lorsqu'on descend dans les petits diamètres. On arrive néanmoins à obtenir des tubes parfaits dans des diamètres compris entre 80 et 100 mm, mais le prix de revient de la machine est fortement gonflé par la nécessité d'avoir trois rouleaux presseurs pouvant s'écarter.Finally, according to a last known machine, the forming is carried out by three polyurethane rollers, also distributed in a triangle around a forming roller of small diameter, this machine making it possible to obtain tubes of good cylindricity but whose minimum rolling diameter is determined by the diameter of the polyurethane pressure rollers which come into mutual contact when descending into small diameters. We nevertheless manage to obtain perfect tubes in diameters between 80 and 100 mm, but the cost price of the machine is greatly inflated by the need to have three pressure rollers that can deviate.

Ainsi, plus particulièrement, on connaît le brevet US.3.738 149 qui décrit un procédé et un appareil pour former des tuyaux.Thus, more particularly, US Pat. No. 3,738,149 is known which describes a method and an apparatus for forming pipes.

Dans ce brevet US, il est prévu deux rouleaux inférieurs et trois rouleaux supérieurs. Les rouleaux inférieurs sont fixés alors que le rouleau central de formage et les rouleaux supérieurs sont mobiles verticalement de façon indépendante.In this US patent, two lower rollers and three upper rollers are provided. The lower rollers are fixed while the central forming roller and the upper rollers are vertically movable independently.

Conformément à l'appareil décrit dans ce brevet US 3 738 149, l'entraînement est réalisé par les rouleaux inférieurs, le rouleau central étant simplement monté flottant. Les rouleaux supérieurs sont montés sur un support coulissant et pour déplacer le rouleau central il convient d'agir en le pressant par un des rouleaux supérieurs.In accordance with the apparatus described in this patent US Pat. No. 3,738,149, the drive is carried out by the lower rollers, the central roller being simply mounted floating. The upper rollers are mounted on a sliding support and to move the central roller it is advisable act by pressing it by one of the upper rollers.

Comme cela ressortira de la description détaillée ci-après, les moyens constitutifs de la machine selon la présente invention sont bien différents.As will become apparent from the detailed description below, the means constituting the machine according to the present invention are very different.

Le but de la présente invention est de proposer une machine permettant de former avec une cylindricité parfaite des tuyaux de petit diamètre, inférieur notamment à 100 mm, ladite machine devant être robuste et d'un faible coût de réalisation.The object of the present invention is to provide a machine making it possible to form pipes of small diameter, in particular less than 100 mm, with perfect cylindricity, said machine having to be robust and of low production cost.

Selon l'invention, la machine à former des tuyaux de faible diamètre, notamment par roulage, comporte un bâti, un rouleau formeur monté rotatif sur le bâti, des moyens d'entraînement en rotation dudit rouleau, des mâchoires de formage disposées autour du rouleau formeur et des moyens pour déplacer lesdites mâchoires par rapport au rouleau, ces deux mâchoires étant diamétralement opposées par rapport au rouleau formeur, l'une étant montée fixe et l'autre mobile sur le bâti, le rouleau formeur étant monté à pivot sur le bâti de manière à pouvoir s'écarter de la mâchoire fixe.According to the invention, the machine for forming pipes of small diameter, in particular by rolling, comprises a frame, a forming roller rotatably mounted on the frame, means for driving said roller in rotation, forming jaws arranged around the roller. former and means for moving said jaws relative to the roller, these two jaws being diametrically opposite with respect to the forming roller, one being mounted fixed and the other movable on the frame, the forming roller being pivotally mounted on the frame so as to be able to move away from the fixed jaw.

Conformément à d'autres caractéristiques de la machine selon la présente invention : la mâchoire mobile est portée par au moins un support muni de moyens d'actionnement et ledit support est monté à pivot sur le bâti ; les supports de mâchoire mobile sont des leviers portant la mâchoire à une extrémité et les moyens d'actionnement sont des vérins reliés à l'autre extrémité desdits leviers ; la machine comporte des glissières de réglage dans lesquelles les mâchoires de formage sont montées coulissantes et des moyens de réglage de l'écartement des mâchoires sont associés auxdites glissières; chaque mâchoire de formage est formée d'un bloc rigide s'étendant le long du rouleau-formeur sur sensiblement toute sa longueur et chaque mâchoire comporte une rainure en V s'ouvrant vers le rouleau formeur ; le rouleau formeur est pourvu dé moyens d'accrochage du bord d'une tôle à former et ces moyens comprennent une fente tangentielle longitudinale, pénétrant dans le rouleau presseur.According to other characteristics of the machine according to the present invention: the movable jaw is carried by at least one support provided with actuating means and said support is pivotally mounted on the frame; the movable jaw supports are levers carrying the jaw at one end and the actuation means are jacks connected to the other end of said levers; the machine comprises adjustment slides in which the forming jaws are slidably mounted and means for adjusting the spacing of the jaws are associated with said slides; each forming jaw is formed from a block rigid extending along the forming roller over substantially its entire length and each jaw has a V-groove opening towards the forming roller; the forming roller is provided with means for hooking the edge of a sheet to be formed and these means comprise a longitudinal tangential slot, penetrating into the pressing roller.

L'invention va maintenant être décrite plus en détail en se référant à un mode de réalisation particulier, cité à titre d'exemple non limitatif et représenté sur les dessins annexés, dans lesquels :

  • Fig. 1 représente une vue de face de la machine à former les tuyaux selon l'invention.
  • Fig. 2 représente une vue de côté de la machine de la figure 1, et
  • Fig. 3 représente une coupe de la machine selon la ligne III-III de la figure 1.
The invention will now be described in more detail with reference to a particular embodiment, cited by way of non-limiting example and shown in the accompanying drawings, in which:
  • Fig. 1 shows a front view of the pipe forming machine according to the invention.
  • Fig. 2 represents a side view of the machine of FIG. 1, and
  • Fig. 3 represents a section of the machine along line III-III of FIG. 1.

Telle que représentée sur la fig. l, la machine selon l'invention comporte un bâti 1 sur lequel est monté un rouleau formeur rotatif 2 s'étendant sur toute la longueur dudit bâti et dépassant latéralement en porte-à-faux d'un côté de celui-ci, ledit rouleau étant articulé sur le bâti autour d'un axe horizontal 4 et ayant son extrémité en porte-à-faux montée dans un palier fixe 5 fixé en bout d'un bras 3 s'étendant dans le prolongement du rouleau 2.As shown in fig. l, the machine according to the invention comprises a frame 1 on which is mounted a rotary forming roller 2 extending over the entire length of said frame and projecting laterally in overhang on one side thereof, said roller being articulated on the frame around a horizontal axis 4 and having its cantilevered end mounted in a fixed bearing 5 fixed at the end of an arm 3 extending in the extension of the roller 2.

L'autre extrémité du bras 3 fixé au palier 5 est articulée sur une pièce de liaison 6 elle-même articulée à l'extrémité de la tige verticale d'un vérin de manoeuvre 7 dont le corps est également articulé à sa base sur un socle fixe 8.The other end of the arm 3 fixed to the bearing 5 is articulated on a connecting piece 6 itself articulated at the end of the vertical rod of an actuating cylinder 7, the body of which is also articulated at its base on a base fixed 8.

Comme représenté sur les fig. 1 et 3, le rouleau formeur 2 se compose essentiellement, de manière classique, d'un mandrin de formage central 9 qui s'étend le long du bâti 1 entre un palier latéral démontable 10 situé à droite sur la fig. 1 et un manchon rotatif 11 de gauche dans lequel l'extrémité correspondante du mandrin est emmanchée et clavetée, ledit manchon 11 formant la partie du rouleau située en porte-à-faux articulée autour de l'axe 4 et montée dans le palier fixe 5. Sur ce manchon 11 est clavetée une roue dentée 12 qui engrène avec une roue complémentaire 13 montée sur l'arbre de sortie d'un groupe moto-réducteur 14.As shown in fig. 1 and 3, the forming roller 2 essentially consists, conventionally, of a central forming mandrel 9 which extends along the frame 1 between a removable lateral bearing 10 situated on the right in FIG. 1 and a rotary sleeve 11 on the left in which the corresponding end of the mandrel is fitted and keyed, said sleeve 11 forming the part of the roller located in a cantilever articulated around the axis 4 and mounted in the fixed bearing 5 On this sleeve 11 is keyed a toothed wheel 12 which meshes with a complementary wheel 13 mounted on the output shaft of a geared motor group 14.

Ces roues dentées 12 et 13 ont un module de denture suffisant pour permettre de relever le mandrin par engrènement plus ou moins profond des dentures entre elles.These toothed wheels 12 and 13 have a sufficient toothing module to allow the mandrel to be raised by more or less deep engagement of the teeth between them.

Sur la table transversale du bâti 1 est fixée une glissière 15 qui s'étend sur toute la largeur dudit bâti, et dans laquelle est montée coulissante vers le haut une mâchoire dite fixe 16 déplaçable verticalement et reposant horizontalement en bout sur deux vis inférieures de réglage 17 et 18 traversant perpendiculairement la table du bâti 1 et vissées dans celle-ci.On the transverse table of the frame 1 is fixed a slide 15 which extends over the entire width of said frame, and in which is slidably mounted upwards a so-called fixed jaw 16 movable vertically and resting horizontally at the end on two lower adjustment screws 17 and 18 crossing perpendicularly the table of the frame 1 and screwed into it.

La mâchoire fixe 16 s'étend sous le mandrin de formage 9 et à l'aplomb de celui-ci tandis qu'au-dessus dudit mandrin, et dans une position diamétralement opposée à celle de la mâchoire fixe, s'étend une mâchoire mobile supérieure 19 montée coulissante à ses deux extrémités dans des glissières verticales 20 et 21 supportées à l'aplomb du mandrin 9 par des supports en forme de levier 22 articulés autour d'axes horizontaux 23 à l'extrémité supérieure de montants verticaux 24 fixés sur la table du bâti 1.The fixed jaw 16 extends under the forming mandrel 9 and directly above it while above said mandrel, and in a position diametrically opposite to that of the fixed jaw, extends a movable jaw upper 19 slidingly mounted at its two ends in vertical slides 20 and 21 supported vertically above the mandrel 9 by lever-shaped supports 22 articulated around horizontal axes 23 at the upper end of vertical uprights 24 fixed on the frame table 1.

Les extrémités des leviers 22 opposés aux glissières par rapport aux axes d'articulation 23 sont articulées au moyen d'axes horizontaux 25 et de chapes 26 à l'extrémité supérieure de tiges de vérin 27 et 28 d'actionnement de la mâchoire mobile orientées verticalement et articulées à leur base sur le bâti 1. La mâchoire mobile 19 est supportée à ses deux extrémités, à l'aplomb du mandrin 9,par des vis verticales de réglage de l'écartement des mâchoires 29 et 30 qui traversent le fond des glissières 20 et 21 et sont vissées dans celles-ci.The ends of the levers 22 opposite the slides with respect to the articulation axes 23 are articulated by means of horizontal axes 25 and yokes 26 at the upper end of actuator rods 27 and 28 for actuating the movable jaw oriented vertically and articulated at their base on the frame 1. The movable jaw 19 is supported at its two ends, plumb with the mandrel 9, by vertical screws for adjusting the spacing of the jaws 29 and 30 which pass through the bottom of the slides 20 and 21 and are screwed therein.

Sur leur côté dirigé vers le mandrin de formage 9 les deux mâchoires fixe 16 et mobile 19 comportent toutes deux une rainure longitudinale en V, respectivement 31 et 32, dont les flancs inclinés s'étendent parallèlement au mandrin qu'ils enveloppent.On their side directed towards the forming mandrel 9 the two fixed 16 and movable jaws 19 both have a longitudinal V-shaped groove, respectively 31 and 32, the inclined sides of which extend parallel to the mandrel which they envelop.

De préférence, l'angle d'ouverture du V des rainures des deux mâchoires est choisi entre 90 et 120° mais, bien entendu, ce choix n'est pas impératif.Preferably, the opening angle of the V of the grooves of the two jaws is chosen between 90 and 120 ° but, of course, this choice is not imperative.

Le mandrin 9 comporte une fente 33 tangentielle (fig. 3) s'étendant parallèlement à l'axe du mandrin sur toute la longueur des mâchoires 16 et 19.The mandrel 9 has a tangential slot 33 (FIG. 3) extending parallel to the axis of the mandrel over the entire length of the jaws 16 and 19.

La machine à former les tuyaux décrite précédemment fonctionne de la façon suivante :

  • la tige du vérin 7 est mise en extension, ce qui provoque le relèvement du bras 3 et par conséquent l'abaissement du mandrin 2 dans la rainure en V de la mâchoire fixe 16. Les tiges des vérins 27 et 28 sont mises ensuite simultanément en extension de manière à faire basculer les leviers 22 autour de leurs axes horizontaux 23 et rapprocher ensuite la mâchoire supérieure mobile 19 du mandrin de formage 2 dont la partie supérieure vient se loger à l'intérieur de la rainure en V de ladite mâchoire mobile, un interstice correspondant à l'épaisseur de la tôle à rouler étant laissé entre le mandrin et les deux mâchoires 16 et 19. On referme le palier 10 et la machine est alors prête à fonctionner.
The pipe forming machine described above operates as follows:
  • the rod of the jack 7 is put in extension, which causes the raising of the arm 3 and consequently the lowering of the mandrel 2 in the V-groove of the fixed jaw 16. The rods of the jacks 27 and 28 are then put simultaneously in extension so as to tilt the levers 22 around their horizontal axes 23 and then bring the movable upper jaw 19 closer to the forming mandrel 2, the upper part of which is housed inside the V-groove of said movable jaw, a gap corresponding to the thickness of the sheet to be rolled being left between the mandrel and the two jaws 16 and 19. The bearing 10 is closed and the machine is then ready to operate.

Une tôle préalablement coupée aux dimensions du tuyau à rouler est présentée le long du mandrin 2 de la machine et le bord avant de ladite tôle est engagé dans la fente tangentielle 33 du mandrin. Ce dernier est ensuite entraîné en rotation par le moto-réducteur 14 par l'intermédiaire des deux roues dentées en prise 12 et 13, et le manchon 11 entraînant avec lui la tôle qui est contrainte à passer entre ledit mandrin et les flancs des rainures en V 31 et 32 des deux mâchoires 16 et 19. Le laminage de la tôle entre le mandrin 2 et les flancs des rainures en V des deux mâchoires 16 et 19 assure le cambrage et l'enroulement de ladite tôle autour du mandrin. Après deux tours de ce dernier, le tuyau est formé avec recouvrement des bords de la tôle et la rotation est interrompue tandis que, simultanément, les tiges des deux vérins d'actionnement 27 et 28 sont rétractées, provoquant le basculement vers l'arrière des deux leviers 22 et le soulèvement de la mâchoire mobile 19.A sheet previously cut to the dimensions of the pipe to be rolled is presented along the mandrel 2 of the machine and the front edge of said sheet is engaged in the tangential slot 33 of the mandrel. The latter is then driven in rotation by the geared motor 14 via the two toothed wheels 12 and 13, and the sleeve 11 carrying with it the sheet which is forced to pass between said mandrel and the sides of the grooves in V 31 and 32 of the two jaws 16 and 19. The rolling of the sheet between the mandrel 2 and the sides of the V-grooves of the two jaws 16 and 19 ensures the bending and winding of said sheet around the mandrel. After two turns of the latter, the pipe is formed with overlapping of the edges of the sheet and the rotation is interrupted while, simultaneously, the rods of the two actuating cylinders 27 and 28 are retracted, causing the rearward tilting of the two levers 22 and the lifting of the movable jaw 19.

Le palier 10 est démonté et ouvert pour dégager l'extrémité du mandrin 2 et la tige du vérin latéral 7 est rétractée assurant le soulèvement du mandrin 2 au-dessus de la mâchoire fixe 16 permettant ainsi le dégagement par coulissement du tube latéralement du côté de la machine opposé au moto-réducteur 14 et au vérin 7.The bearing 10 is disassembled and opened to release the end of the mandrel 2 and the rod of the lateral jack 7 is retracted ensuring the lifting of the mandrel 2 above the fixed jaw 16 thus allowing disengagement by sliding the tube laterally from the side of the machine opposite to the gear motor 14 and to the jack 7.

Le mandrin 2 étant libéré du tube qui vient d'être formé, la tige de vérin 7 est à nouveau mise en extension, provoquant l'abaissement du mandrin 2 à l'intérieur de la rainure en V de la mâchoire inférieure fixe 16,et la mâchoire supérieure mobile 19 vient à nouveau coiffer la partie supérieure du mandrin sous l'action des deux vérins d'actionnement 27 et 28 qui font basculer vers l'avant les leviers 22. Après que le palier 10 est refermé, la machine est à nouveau prête à fonctionner et le cycle de formage peut recommencer.The mandrel 2 being released from the tube which has just been formed, the actuator rod 7 is again extended, causing the mandrel 2 to be lowered inside the V-groove of the fixed lower jaw 16, and the movable upper jaw 19 again covers the upper part of the mandrel under the action of the two actuating cylinders 27 and 28 which tilt the levers 22 forward. After the bearing 10 is closed, the machine is again ready to operate and the forming cycle can start again.

Le fait pour la tôle d'être comprimée le long de quatre génératrices parallèles diamétralement opposées deux à deux sur le mandrin 2 permet d'avoir des tubes de diamètre pratiquement constant avec des tolérances d'exécution très serrées.The fact that the sheet is compressed along four diametrically opposite parallel generators two by two on the mandrel 2 makes it possible to have tubes of practically constant diameter with very tight execution tolerances.

La machine selon l'invention permet de réaliser des tubes de diamètre inférieur à 100 mm avec une cylindricité parfaite et une cadence de production supérieure à celle obtenue sur les machines connues actuellement.The machine according to the invention makes it possible to produce tubes with a diameter of less than 100 mm with perfect cylindricity and a production rate higher than that obtained on currently known machines.

Le système selon l'invention permet, en outre, de former avec un même mandrin un grand nombre de diamètres de tube.The system according to the invention also makes it possible to form a large number of tube diameters with the same mandrel.

Bien entendu, la portée de l'invention n'est pas limitée au seul mode de réalisation décrit ci- dessus mais elle couvre également toute variante qui ne différerait que par des détails.Of course, the scope of the invention is not limited to the single embodiment described above, but it also covers any variant which would differ only in details.

C'est ainsi, que par exemple, une machine à former selon l'invention peut comporter un nombre de mâchoires supérieur à deux ou encore la rainure formée dans lesdites mâchoires peut avoir une section de forme différente d'un V telle que par exemple une forme semi-circulaire.Thus, for example, a forming machine according to the invention can have a number of jaws greater than two or the groove formed in said jaws can have a section of shape different from a V such as for example a semi-circular shape.

En outre, les vérins d'actionnement de l'ouverture et de la fermeture des mâchoires ainsi que le vérin servant à soulever le mandrin 2 peuvent être remplacés par un moyen équivalent quelconque.In addition, the actuating cylinders for opening and closing the jaws and the actuator for lifting the mandrel 2 can be replaced by any equivalent means.

Claims (6)

1. Machine à former des tuyaux de faible diamètre notamment par roulage, ladite machine comportant un bâti (1), un rouleau formeur monté rotatif sur le bâti et des moyens d'entraînement en rotation dudit rouleau, des mâchoires de formage (16, 19) disposées autour du rouleau formeur (2), et des moyens pour déplacer lesdites mâchoires par rapport au rouleau, ces deux mâchoires étant diamétralement opposées par rapport au rouleau formeur, l'une étant montée fixe (16) et l'autre mobile (19) sur le bâti (1), caractérisée en ce que le rouleau formeur (2) est monté à pivot sur le bâti de manière à pouvoir s'écarter de la mâchoire fixe.1. Machine for forming small diameter pipes, in particular by rolling, said machine comprising a frame (1), a forming roller rotatably mounted on the frame and means for driving said roller in rotation, forming jaws (16, 19 ) arranged around the forming roller (2), and means for moving said jaws relative to the roller, these two jaws being diametrically opposite with respect to the forming roller, one being fixedly mounted (16) and the other movable (19 ) on the frame (1), characterized in that the forming roller (2) is pivotally mounted on the frame so as to be able to move away from the fixed jaw. 2. Machine selon la revendication 1, dans laquelle la mâchoire mobile est portée par au moins un support (22) muni de moyens d'actionnement, caractérisée en ce que ledit support (22) est monté à pivot sur le bâti.2. Machine according to claim 1, wherein the movable jaw is carried by at least one support (22) provided with actuating means, characterized in that said support (22) is pivotally mounted on the frame. 3. Machineselon la revendication 2, caractérisée en ce que les supports de mâchoire mobile sont des leviers (22) portant la mâchoire à une extrémité et en ce que les moyens d'actionnement sont des vérins (27,28) reliés à l'autre extrémité desdits leviers.3. Machines according to claim 2, characterized in that the movable jaw supports are levers (22) carrying the jaw at one end and in that the actuating means are jacks (27,28) connected to the other end of said levers. 4. Machine selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'elle comporte des glissières de réglage (15, 21), dans lesquelles les mâchoires de formage (16, 19) sont montées coulissantes et en ce que des moyens de réglage de l'écartement des mâchoires sont associés auxdites glissières.4. Machine according to any one of claims 1 to 3, characterized in that it comprises adjustment slides (15, 21), in which the forming jaws (16, 19) are mounted sliding and in that means for adjusting the spacing of the jaws are associated with said slides. 5. Machine selon l'une quelconque des revendications 1 à 4, dans laquelle chaque mâchoire de formage est formée d'un bloc rigide s'étendant le long du rouleau formeur sur sensiblement toute sa longueur, caractérisée en ce que chaque mâchoire comporte une rainure en V (31, 32) s'ouvrant vers le rouleau formeur.5. Machine according to any one of claims 1 to 4, wherein each forming jaw is formed of a rigid block extending along the forming roller over substantially all of its length, characterized in that each jaw has a V-groove (31, 32) opening towards the forming roller. 6. Machine selon l'une quelconque des revendications 1 à 5 et dans laquelle le rouleau formeur est pourvu de moyens d'accrochage du bord d'une tôle à former, caractérisée en ce que ces moyens comprennent une fente tangentielle longitudinale, pénétrant dans le rouleau presseur.6. Machine according to any one of claims 1 to 5 and in which the forming roller is provided with means for hooking the edge of a sheet to be formed, characterized in that these means comprise a longitudinal tangential slot, penetrating into the pressure roller.
EP19810401002 1980-06-26 1981-06-22 Apparatus for forming tubes of small diameter Ceased EP0043750A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8014277 1980-06-26
FR8014277A FR2485407A1 (en) 1980-06-26 1980-06-26 MACHINE FOR FORMING LOW DIAMETER PIPES

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EP0043750A1 true EP0043750A1 (en) 1982-01-13

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EP19810401002 Ceased EP0043750A1 (en) 1980-06-26 1981-06-22 Apparatus for forming tubes of small diameter

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EP (1) EP0043750A1 (en)
FR (1) FR2485407A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110711803A (en) * 2019-10-14 2020-01-21 湖北精工钢结构有限公司 Backing plate edge rolling frock
CN110834038A (en) * 2019-11-19 2020-02-25 雷朋电气集团有限公司 Bus processing machine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1634661A (en) * 1925-03-06 1927-07-05 Sachs Gmbh R Contrivance for rolling zinc and other sheet-metal hollow ware
US1645239A (en) * 1924-08-28 1927-10-11 Hume Walter Reginald Apparatus for the manufacture of pipes and the like from metal sheets or plates
FR711546A (en) * 1931-02-18 1931-09-11 Pont A Mousson Fond Improvements to machines for the manufacture of tubes
DE584593C (en) * 1931-07-18 1933-09-21 E H Hugo Junkers Dr Ing Device for the production of cylindrical hollow bodies u. Like. From sheet metal strips
US1968455A (en) * 1932-06-30 1934-07-31 Jones Lloyd Method and apparatus for forming pipe
FR2097182A7 (en) * 1970-07-04 1972-03-03 Ferranti Albino Sheet metal cylinders - bending of long lengths
US3738149A (en) * 1971-10-01 1973-06-12 B Archer Pipe forming apparatus and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1645239A (en) * 1924-08-28 1927-10-11 Hume Walter Reginald Apparatus for the manufacture of pipes and the like from metal sheets or plates
US1634661A (en) * 1925-03-06 1927-07-05 Sachs Gmbh R Contrivance for rolling zinc and other sheet-metal hollow ware
FR711546A (en) * 1931-02-18 1931-09-11 Pont A Mousson Fond Improvements to machines for the manufacture of tubes
DE584593C (en) * 1931-07-18 1933-09-21 E H Hugo Junkers Dr Ing Device for the production of cylindrical hollow bodies u. Like. From sheet metal strips
US1968455A (en) * 1932-06-30 1934-07-31 Jones Lloyd Method and apparatus for forming pipe
FR2097182A7 (en) * 1970-07-04 1972-03-03 Ferranti Albino Sheet metal cylinders - bending of long lengths
US3738149A (en) * 1971-10-01 1973-06-12 B Archer Pipe forming apparatus and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110711803A (en) * 2019-10-14 2020-01-21 湖北精工钢结构有限公司 Backing plate edge rolling frock
CN110834038A (en) * 2019-11-19 2020-02-25 雷朋电气集团有限公司 Bus processing machine
CN110834038B (en) * 2019-11-19 2024-04-16 雷朋电气集团有限公司 Bus processing machine

Also Published As

Publication number Publication date
FR2485407A1 (en) 1981-12-31
FR2485407B1 (en) 1983-11-18

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