EP2203266B1 - Machine a plier les tuyaux pourvue d'un mandrin de pliage a structure portante particulierement resistante aux contraintes - Google Patents

Machine a plier les tuyaux pourvue d'un mandrin de pliage a structure portante particulierement resistante aux contraintes Download PDF

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Publication number
EP2203266B1
EP2203266B1 EP08834239.9A EP08834239A EP2203266B1 EP 2203266 B1 EP2203266 B1 EP 2203266B1 EP 08834239 A EP08834239 A EP 08834239A EP 2203266 B1 EP2203266 B1 EP 2203266B1
Authority
EP
European Patent Office
Prior art keywords
load bearing
bearing structure
bending
machine
pipe
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.)
Active
Application number
EP08834239.9A
Other languages
German (de)
English (en)
Other versions
EP2203266A2 (fr
Inventor
Alessandro Caporusso
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.)
CML International SpA
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CML International SpA
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Publication date
Application filed by CML International SpA filed Critical CML International SpA
Publication of EP2203266A2 publication Critical patent/EP2203266A2/fr
Application granted granted Critical
Publication of EP2203266B1 publication Critical patent/EP2203266B1/fr
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Classifications

    • 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
    • B21D9/05—Bending tubes using mandrels or the like co-operating with forming members
    • B21D9/07—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only
    • B21D9/073—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only with one swinging forming member
    • 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
    • B21D9/04—Bending tubes using mandrels or the like the mandrel being rigid
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/02—Bending by stretching or pulling over a die
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/22—Auxiliary equipment, e.g. positioning devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/16—Auxiliary equipment, e.g. machines for filling tubes with sand

Definitions

  • the present invention relates to a pipe bending machine with bending mandrel having a load bearing structure which is particularly resistant to working stresses.
  • US 2007/017269 A1 discloses a prior art pipe bending machine according to the preamble of claim 1.
  • the machine workbench is subjected substantially to bending stresses as a result of the force applied by the bending die over the machine workbench.
  • These bending stresses that propagate at an end of the machine structure from the bending die to the pipe to be bent and, in turn, from the latter to the mandrel and the mandrel rod, and again to the machine workbench through the extractor, in its end opposite to the end in which the mandrel rod is restrained, determine repeated elastic deformations on the workbench that cause warping of the structure.
  • the bending stresses become particularly heavy, especially in dependence on a material, a diameter and a thickness of the pipe to be bent, the elastic deformations become so high that they are no longer allowable if one wants to achieve a good quality of work and product.
  • This invention aims to overcome these drawbacks.
  • an object of the present invention is to manufacture a structure for a pipe bending machine with bending mandrel that is not subjected to bending stresses, when a pipe to be bent is subjected to a traction force by a bending head die.
  • a pipe bending machine with bending mandrel having a load bearing structure which is particularly resistant to working stresses, in which an extractor is fixed in a rear portion of the pipe bending machine and mandrel rod extends with its longitudinal axis, from the extractor beyond a front portion of the machine, where a bending head which is provided with a die stresses a pipe to be bent, which is inserted in a mandrel, by a traction resultant force that is transmitted along the mandrel rod to the extractor that counteracts with a resultant restraining reaction, the pipe bending machine comprising a load bearing structure having a profile such that it contains inside the longitudinal axis of the mandrel rod, in such a way that the load bearing structure is subjected mainly to compression stresses.
  • the above mentioned pipe bending machine is particularly advantageous as said machine, since it is not subjected to bending stresses, does not undergo in its load bearing structure deformations that worsen its working way and damage its product. Since it is the same load bearing structure that balances the tangential force applied to the die, the pipe bending machine discharges substantially only its load on a floor, thereby it needs no anchoring to the soil to prevent its deformation and increase its statics.
  • FIG. 1 and 2 a first embodiment of a load bearing structure of a pipe bending machine with bending mandrel according to the present invention is shown in a perspective view and in a schematic longitudinal cross section, respectively, is shown.
  • a first embodiment of load bearing structure which is prismatic or box-shaped, is designed as 1.
  • an extractor is generally indicated as 2
  • a front end has a front frame 3.
  • the bearing structure 1 is sustained rear and in front on supporting elements 4 and 5 respectively.
  • the front supporting element 5 projects forward with a step 6, on which a bending head 7 rests.
  • the bending head 7 is provided with a die 8 that is equipped with a clamping mechanism 9.
  • the clamping mechanism 9 is the subject-matter of another patent application of the same Applicant.
  • the bending head 7 is slidingly mounted on the step 6 by means of guides 10 that are horizontally located on the same step.
  • the bending head 7 contacts an abutment member 11 which is fixed to the front frame 3 of the load bearing structure 1.
  • the abutment member 11 makes a transversal sliding coupling between the load bearing structure 1 and the bending head 7.
  • a bending mandrel 12, which is mounted on an end of a mandrel rod 13, is not further described as it is the subject-matter of a previous patent application of the same Applicant.
  • a pipe T to be bent is positioned on the bending mandrel 12.
  • the pipe T is sustained on a mandrel holder 14 of a known kind, which is shown in Figure 1 but is not represented in Figures 2 and 3 for clarity sake.
  • the extractor 2 is best shown in Figure 4 , that is an enlarged detail of the left-hand end of the machine.
  • the extractor 2 is of a known kind and then not further described.
  • the extractor is not cantilevered on the workbench, like in the existing bending machines, but according to the invention the extractor is located in a through manner in an anchoring plate 15.
  • the anchoring plate 15 of the extractor 2, which is suitably strengthened by a stiffening rib 16, is fixed to a rear frame 17 as a rear portion of the load bearing structure 1, in such a way that a restraining force, which is exercised by the extractor 2 against the traction force applied by the die 8, is discharged only on the load bearing structure 1.
  • the load bearing structure 1 has the rear frame 17 that surrounds the extractor 2 at least in large part but preferably totally.
  • the rear portion of the load bearing structure is configured as a frame like the front frame 3.
  • the load bearing structure 1 of the pipe bending machine with bending mandrel is prismatic or box-shaped.
  • the load bearing structure 1 has side walls 18, 19, 20, 21. Lifting sleeves, indicated as 22, are shown.
  • openings to enter the load bearing structure 1 are generally designed as 23.
  • the load bearing structure 1 As seen below, some parts of the load bearing structure 1, for example, which are related to the side walls, can be removed. However, all the co-operating parts of the load bearing structure are supposed to be subjected to compression in order to oppose the traction force applied by the die in a pipe bending operation. In other words, the resultant of the traction forces applied by the bending head and the resultant of the restraining forces exercised by the extractor 2, which have an axis g of the mandrel rod 13 as a direction of application, pass inside a profile being defined by the front frame 3 and the rear frame 17 of the load bearing structure 1, as the profile of the load bearing structure 1 contains inside the mandrel rod 13.
  • the load bearing structure 1 has a geometrical cross section having a centre somewhat far from the axis g of the mandrel rod where the existing forces are transmitted.
  • Figure 5 is a transversal cross section of the load bearing structure 1, in its first box-shaped embodiment.
  • the transversal cross section is substantially rectangular, and it can be pointed out that the geometrical centre of the cross section, i.e. the centre C, is not coincident with a point G that represents the intersection point of the axis g of the mandrel rod 13 in the cross section in exam.
  • the moment of inertia of the resistant cross section can be modified, for example applying a strengthening plate 24 in order to make the centre of inertia coincident with the intersection point G of the axis g of the mandrel rod 13.
  • a second embodiment of a load bearing structure which is particularly resistant to the working stresses is shown in a perspective view which is longitudinally cross-sectioned by a vertical symmetry plane passing through the axis g.
  • the load bearing structure in the second embodiment is round tubular and is indicated as 25, and has a front frame 3 and rear frame 17 like in the first embodiment. If the extractor 2 is positioned centrally inside the load bearing structure, the load bearing structure reacts in such a way to balance, above all, the stress applied on the pipe to be bent as the force applied on the pipe by means of bending head is discharged on the round tubular structure through the vertical rest of the bending head 7 on the front frame 3.
  • a third embodiment of a load bearing structure according to the present invention is shown in a perspective view which is longitudinally cross-sectioned by a vertical symmetry plane passing through the axis g.
  • the load bearing structure of the third embodiment is generally reticular and is indicated as 26, and has a front frame 3 and rear frame 17 like in the first embodiment. If the extractor 2 is positioned centrally inside the load bearing structure, the load bearing structure reacts in such a way to balance, above all, the stress applied on the pipe to be bent as the force applied on the pipe by means of bending head is discharged on the reticular structure through the vertical rest of the bending head 7 on the front frame 3.
  • the resistant parts of the reticular structure that are substantially beams indicated generally as 27, which are positioned in the corners of the structure, form a framework, and walls can be not present.
  • An wall portion 28 can act as the straightening plate 24, which is described in the first embodiment and shown in Figure 5 .
  • Reinforcements and stiffening ribs for the beams 27 are desirable in order to obtain a uniform reaction of the load bearing structure 26, which is shown more in detail in the general perspective view in Figure 8 , where the pipe bending machine with bending mandrel is not represented for clarity sake.
  • the load bearing structure according to the invention can have solid side walls, as in the first and second embodiment, or non continuous, when it has a framework and reticular side walls, as in the third embodiment.
  • the load bearing structure would also have a different polygonal transversal cross section. If the cross section is round, it can be circular or oval.
  • the load bearing structure has a transversal cross section having a momentum of inertia such that the traction force applied by means of the die has a direction passing through the centre of inertia of the transversal cross section.
  • a further advantage is given by the fact that the bending head is slidable mounted in said front end on guides horizontally positioned on a step resting on the soil transversally to the longitudinal direction, the bending head being in contact with an abutment member in the front end of the load bearing structure, the abutment member making a sliding coupling with the front end of the load bearing structure. In such a way, useless flexing stresses to the load bearing structure near the bending head are avoided.
  • the advantages of the load bearing structure according to the present invention are even more. It should be understood that, thanks to an optimum use of the metal material that works to compression, the load bearing structure of the described kind allows the manufacturing costs of a pipe bending machine to be reduced, as a minor quantity of material is requested with respect to the existing pipe bending machine.
  • a further advantage is represented by the fact that the load bearing structure according to the invention is more able to undergo changes in its length if relevant extension pipes have to be worked. In fact, in the bending machine with bending mandrel of the prior art, if the length of the workbench is increased, also the deformations being caused by the flexion in the working process are increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Claims (7)

  1. Cintreuse avec mandrin de cintrage ayant une structure de support de charge qui est particulièrement résistante aux contraintes d'usinage, dans laquelle un extracteur (2) est fixé sur une partie arrière de la cintreuse, et une tige de mandrin (13) s'étend avec son axe longitudinal (g), à partir de l'extracteur au-delà d'une partie avant de la machine, où une tête de cintrage (7) qui est prévue avec une matrice (8) contraint un tuyau (T) à cintrer, ledit tuyau étant inséré dans un mandrin (12), par une force résultante de traction qui est transmise le long de la tige de mandrin (13) à l'extracteur (2) qui réagit avec une réaction résultante de retenue, caractérisée en ce que la cintreuse comprend une structure de support de charge (1 ; 25 ; 26) ayant un profilé de sorte que la structure contient dans son propre intérieur, l'axe longitudinal (g) de la tige de mandrin (13), de sorte que la structure de support de charge est principalement soumise aux contraintes de compression, ladite structure de support de charge ayant une section transversale avec un moment d'inertie de sorte que la force de traction appliquée au moyen de la matrice (8) a une direction passant par le centre d'inertie de la section transversale.
  2. Machine selon la revendication 1, caractérisée en ce que ladite structure de support de charge (1) est prismatique.
  3. Machine selon la revendication 1, caractérisée en ce que ladite structure de support de charge (25) a une section transversale ronde.
  4. Machine selon la revendication 1, caractérisée en ce que ladite structure de support de charge (26) est une structure réticulaire.
  5. Machine selon la revendication 1, caractérisée en ce que ladite structure de support de charge (1 ; 25 ; 26) s'appuie sur un plancher par des éléments de support avant et arrière (4, 5).
  6. Machine selon la revendication 1, caractérisée en ce que ladite tête de cintrage (7) est montée de manière coulissante dans ladite extrémité avant sur des guides (10, 10) positionnés horizontalement sur une marche (6) reposant au sol transversalement par rapport à la direction longitudinale de la machine, la tête de cintrage (7) étant en contact avec un élément de butée (11) dans la partie avant de la structure de support de charge (1 ; 25 ; 26).
  7. Machine selon la revendication 6, caractérisée en ce que l'élément de butée (11) forme un couplage coulissant transversal.
EP08834239.9A 2007-09-17 2008-09-15 Machine a plier les tuyaux pourvue d'un mandrin de pliage a structure portante particulierement resistante aux contraintes Active EP2203266B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000483A ITRM20070483A1 (it) 2007-09-17 2007-09-17 Macchina curvatubi con anima avente una struttura portante particolarmente resistente alle sollecitazioni di loavorazione
PCT/IT2008/000590 WO2009040859A2 (fr) 2007-09-17 2008-09-15 Machine a plier les tuyaux pourvue d'un mandrin de pliage a structure portante particulierement resistante aux contraintes

Publications (2)

Publication Number Publication Date
EP2203266A2 EP2203266A2 (fr) 2010-07-07
EP2203266B1 true EP2203266B1 (fr) 2019-05-08

Family

ID=40316559

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08834239.9A Active EP2203266B1 (fr) 2007-09-17 2008-09-15 Machine a plier les tuyaux pourvue d'un mandrin de pliage a structure portante particulierement resistante aux contraintes

Country Status (12)

Country Link
US (1) US20100206036A1 (fr)
EP (1) EP2203266B1 (fr)
JP (1) JP5438006B2 (fr)
KR (1) KR101562506B1 (fr)
CN (1) CN101801557B (fr)
BR (1) BRPI0816937B1 (fr)
CA (1) CA2699595C (fr)
ES (1) ES2741531T3 (fr)
IT (1) ITRM20070483A1 (fr)
MX (1) MX2010002919A (fr)
RU (1) RU2438819C1 (fr)
WO (1) WO2009040859A2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRM20130259A1 (it) * 2013-05-02 2014-11-03 Cml Int Spa Macchina curvatrice del tipo a matrice e contromatrice per curvare a destra e a sinistra un pezzo allungato
US9297219B2 (en) * 2014-03-15 2016-03-29 Dmar Engineering, Inc. Umbilical buckling testing
JP1525573S (fr) * 2014-11-26 2017-05-22
JP1525571S (fr) * 2014-11-26 2017-05-22
JP1527322S (fr) * 2014-11-26 2017-06-05
JP1525574S (fr) * 2014-11-26 2017-05-22
JP1525570S (fr) * 2014-11-26 2017-05-22
KR101580190B1 (ko) * 2014-12-12 2015-12-24 삼성스텐레스상공(주) 곡관 제조장치
CN108941288A (zh) * 2017-05-18 2018-12-07 张家港市伯勤机械厂 一种自动上下料弯管机
CN111922149B (zh) * 2020-09-03 2024-04-16 济南迈科管道科技有限公司 一种制备标准大半径钢管弯管产品的设备

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US2488896A (en) * 1946-06-14 1949-11-22 Charles J Bertolini Dual pivoted bender for simultaneously bending two parallel lengths of metal tubing
JPH0234690B2 (ja) * 1982-03-19 1990-08-06 Daiichi Koshuha Kogyo Kk Oshimageshikireikankanmagesochi
DE3238264A1 (de) * 1982-10-15 1984-04-19 Rigobert Dipl.-Ing. 5000 Köln Schwarze Rohrbiegemaschine mit biegedorn
US4765168A (en) * 1987-07-27 1988-08-23 Tools For Bending, Inc. Method and apparatus for bending tubing
US5339670A (en) * 1993-05-24 1994-08-23 Anthony Granelli Apparatus and method for bending tubing
US5823031A (en) * 1996-11-20 1998-10-20 Tools For Bending, Inc. Method and apparatus for bulge forming and bending tubes
DE19717472A1 (de) * 1997-04-25 1998-10-29 Suban Ag Verfahren und Vorrichtung zum Profilbiegen mit modularen Biegestationen
DE50100461D1 (de) * 2001-01-30 2003-09-11 Blm Spa Maschine zum Biegen von strangförmigem Material, wie Rohren, Stangen, Profilen oder Metalldraht
FR2833868B1 (fr) * 2001-12-20 2004-03-05 Silfax Machine a cintrer les tubes et son dispositif de cintrage a gauche et/ou a droite
FR2839907B1 (fr) 2002-05-24 2004-12-24 Silfax Machine a cintrer et son dispositif d'entrainement et de retenue d'un tube
EP1380362B1 (fr) * 2002-07-13 2008-03-26 Trumpf Werkzeugmaschinen GmbH + Co. KG Machine de cintrage de tubes avec alimentation de tubes et recul de mandrin
US7021102B2 (en) * 2003-03-15 2006-04-04 Trumpf Rohrtechnik Gmbh + Co. Kg Bending machine with bending tools on opposite sides of a tool platen
WO2005023448A1 (fr) * 2003-09-03 2005-03-17 Honda Motor Co., Ltd. Dispositif et procede de flechissement d'une matiere pour conduite
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Also Published As

Publication number Publication date
ITRM20070483A1 (it) 2009-03-18
RU2010115339A (ru) 2011-10-27
EP2203266A2 (fr) 2010-07-07
JP2010538838A (ja) 2010-12-16
WO2009040859A2 (fr) 2009-04-02
US20100206036A1 (en) 2010-08-19
RU2438819C1 (ru) 2012-01-10
CN101801557B (zh) 2012-11-14
JP5438006B2 (ja) 2014-03-12
CA2699595A1 (fr) 2009-04-02
MX2010002919A (es) 2010-05-27
CA2699595C (fr) 2016-07-12
BRPI0816937A2 (pt) 2011-08-30
KR101562506B1 (ko) 2015-10-22
BRPI0816937B1 (pt) 2019-09-24
ES2741531T3 (es) 2020-02-11
CN101801557A (zh) 2010-08-11
KR20100068280A (ko) 2010-06-22
WO2009040859A3 (fr) 2009-10-15

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