EP3031542A1 - Maschine zum biegen von rohrförmigen produkten und entsprechendes biegeverfahren - Google Patents

Maschine zum biegen von rohrförmigen produkten und entsprechendes biegeverfahren Download PDF

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Publication number
EP3031542A1
EP3031542A1 EP15201261.3A EP15201261A EP3031542A1 EP 3031542 A1 EP3031542 A1 EP 3031542A1 EP 15201261 A EP15201261 A EP 15201261A EP 3031542 A1 EP3031542 A1 EP 3031542A1
Authority
EP
European Patent Office
Prior art keywords
bending
tubular element
bend
machine
feed
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.)
Granted
Application number
EP15201261.3A
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English (en)
French (fr)
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EP3031542B1 (de
Inventor
Valdi Toniutti
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.)
SIMAT Srl
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SIMAT Srl
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Filing date
Publication date
Application filed by SIMAT Srl filed Critical SIMAT Srl
Publication of EP3031542A1 publication Critical patent/EP3031542A1/de
Application granted granted Critical
Publication of EP3031542B1 publication Critical patent/EP3031542B1/de
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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

Definitions

  • Embodiments of the present disclosure relate to a machine to bend tubular products, for example metal tubes to make fluid dynamic tubes, pipes, plants or other.
  • the machine according to the present disclosure allows to bend such tubular products in an automated way and feed them substantially continuously onto a bend core.
  • Embodiments of the present disclosure also relate to a bending method for the tubular elements.
  • continuous feed we mean a feed of the tubular product starting from a product in a roll or in a bar, but which in any case has a starting length higher in multiples than the length of the segment which is the finished product.
  • Machines are known for the automatic or substantially automated bending of tubular elements, which allow to make parts of pipes, plants, tubing, fluidic connections or other, according to different design bends.
  • the known bending machines for this type of product can be distinguished into substantially two groups, that is, bending machines with a core and bending machines without a core.
  • tubular elements are pre-cut to size into segments and then loaded onto the machine to feed them onto the core.
  • This type of known machine although it guarantees a high bending quality of large-size tubular elements with limited radiuses for each bending operation, needs different auxiliary equipment both for the preliminary cutting into segments and also for loading the segments onto the core, prior to the bending steps.
  • this type of known machine has a mainly manual use, with consequent operating delays, the need for specialized personnel and an increase in production costs.
  • Some types of known bending machines are also characterized by the formation of high quantities of waste caused by short rectilinear sections of the end of the bent tubes.
  • waste has two main reasons.
  • the traditional machines with core because of their operating conception, need the tube to be supported at one end, so that the section of tube which acts as a support causes waste to be eliminated at the end.
  • waste is caused because, starting from the segment in the bending step, the external material stretches and creates a deforming effect on the end of the cut tube, which obliges one section to be eliminated.
  • Coreless bending machines are applied in particular for bending tubular elements of reduced diameter with high radiuses, and fed from a roll.
  • a partial occlusion of the tubular element can occur at the bent point, with consequent lack of performance of the final product.
  • one purpose of the present disclosure is to produce a machine for bending tubular elements which allows an efficient bending both of tubular elements with an ample diameter with reduced radiuses of curvature, and tubular elements of a limited diameter with ample bending radiuses.
  • a further purpose of the present disclosure is to make a machine for bending tubular elements which is simple and economic, which allows great operating automation, which uses a bend core and can be fed substantially continuously.
  • Another purpose of the present disclosure is to perfect a method for bending tubular elements which overcomes the shortcomings of the state of the art.
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a machine for bending tubular elements comprises bending means provided with at least one bending arm able to act on an external surface of the tubular element in order to make a bend, and with a bend core able to be disposed inside the tubular element to contrast from the inside the action of the bending arm, and to conform, in a desired way, the bend of the tubular element.
  • the machine according to embodiments described herein also comprises movement means able to move the tubular element in a linear manner, both in the first feed step toward the bending means and also during the bending steps.
  • the bending machine also comprises holding means selectively connected to the bend core in order to keep the latter in a condition of substantial suspension inside the tubular element.
  • the condition of suspension defined by the holding means is such that the movement means feed the tubular element toward the bending means in a direction and sense concordant with a work direction of the bending means on the tubular element.
  • the tubular element is worked head-wise, that is, starting from the same end as that with which the tubular element is fed.
  • the holding means are of the magnetic type, that is, they provide at least a magnetic element disposed on the perimeter around the zone where the tubular element is disposed in the operating condition.
  • magnetic element here and in the following description and claims, we mean any element suitable to exert a magnetic force of attraction on an element, which is also magnetic, magnetized or has magnetic means (in this case the bend core), therefore including permanent magnets, electromagnets, elements which can be magnetized and any other element suitable for the purpose.
  • the at least one magnetic element, or the plurality of magnetic elements, is/are disposed around the tubular element in order to generate a magnetic field which keeps the core in a condition of suspension inside the tubular element.
  • the position of the magnetic element or elements is lateral, that is, not interfering with the axis of feed of the tubular element, and this determines a considerable operating advantage, promoting the automation of the advance and feed movements of the tubular element toward the bending means.
  • the bending core is disposed axially in correspondence to the central zone of magnetic balance, thus staying in a condition of substantial suspension inside the space defined by the magnetic elements.
  • the tubular element is thus fed by the movement means in the direction of feed, inserting itself into the interspace defined between the magnetic elements and the bend core, without any interference by any possible supports of the bend core or the tubular element itself.
  • the tubular element is further fed by the movement means in the same direction and the same sense, in a manner coordinated with the drive of the bending means in order to carry out the bends required.
  • the magnetic elements can be conformed so as to command an axial recovery movement of the core after the bending steps.
  • the holding means comprise a first gripping member disposed in cooperation with a first end, or tail end, of the bend core, and able to maintain the bend core in the suspended condition during the feed steps of the tubular element in the direction of feed.
  • the holding means also comprise a second gripping member disposed in cooperation with a second end, or tail end, of the bend core, and able to maintain the bend core in the suspended condition during the bending steps of the tubular element.
  • the holding means are disposed and act laterally with respect to the position of the tubular element, so that there is no interference by the holding means with respect to the axis of feed of the tubular element.
  • the tubular element is initially fed head-wise by the movement means. Then the tubular element is cut or sheared in order to define a segment of desired length.
  • the segment is fed along the direction of feed so as to free the tail end of the bend core.
  • the second gripping member is activated and the first gripping member is de-activated, so that the movement means can feed the segment in the same direction and sense in order to bring it into cooperation with the bending means and carry out the bends required.
  • the suspended condition of the bend core is guaranteed at the rear by the second gripping member.
  • the bending occurs only on a segment coinciding with the dimension of the development of the portion to be bent, so as to facilitate the operations to move the segment, and to further improve the quality results of the bend carried out.
  • the holding means comprise a support member, for example made of flexible material, articulated meshes or other, which support and feed the core inside a tubular bar, from which a plurality of bent portions are made.
  • the core is moved by the movement means, axially to the tubular bar by a tail end of the latter, until the leading end is reached, and then positioned in cooperation with the bending arm of the bending means.
  • a first form of embodiment of a machine 10 used for the bending of tubular elements, or tubes 11 is shown.
  • the machine 10 comprises a bending member 12 and a movement member 13, in this case represented by an unwinding reel 23.
  • the movement of the tube 11, in a manner known in the state of the art, is achieved by means of a motorized roller-way or with other systems of an alternative type, such as a gripper, or similar means, not shown here in detail, which carry out both the first feed of the tubes 11 toward the bending member 12 and the advance of the tubes 11 during the work steps.
  • the machine 10 also comprises a holding member 15, the function of which will be described in detail hereafter.
  • the bending member 12 comprises a bend core 16 and a bending arm 17, which is mobile with respect to the bend core 16 in order to bend the tubes 11 fed.
  • the bend core 16 is disposed inside the tubes 11 so as to function as contrast, inside the tube 11, to the bending action exerted externally by the bending arm 17.
  • the bend core 16 comprises, in its turn, a polarized support bar 19, a contrasting ogive 20 and, in the case shown in the drawings, at least a bend-follower element 21 disposed articulated at the head of the contrasting ogive 20.
  • bend-follower element 21 There may be only one bend-follower element 21, as in the drawings, or of the multiple type, or it may not be there at all, if the type of bending and/or machine does not require it.
  • the bending arm 17 is of the substantially known type and is only shown schematized in the drawings.
  • the bending arm 17 acts externally to the tube 11 to be bent in order to confer on the latter, in coordination with the advance imparted by the movement member 13, the bending radius envisaged.
  • the bending arm 17 can be selectively positioned on different planes transverse to the direction F, in order to bend the tubes 11 on different planes.
  • the machine 10 also comprises a cutting tool 22, for example a milling cutter or other, in this case, disposed downstream of the holding member 15 and upstream of the bending member 12, which allows to cut to size one segment of tube 11, at the end of the bending steps.
  • a cutting tool 22 for example a milling cutter or other, in this case, disposed downstream of the holding member 15 and upstream of the bending member 12, which allows to cut to size one segment of tube 11, at the end of the bending steps.
  • the cutting tool 22 could also be disposed downstream of the bending member 12, or there could be one or more cutting members 22 upstream and one or more cutting tools downstream of the bending member 12.
  • the tube 11 is fed in the same direction of feed "F", and in the same sense, both in the feed step of the tube 11 to the bending member 12, and also during the bending steps.
  • the direction and sense of feed define a head-wise feed and a head-wise working of the tube 11.
  • the holding member 15 comprises at least a magnetic element 25; by this term we mean permanent magnets, electro-magnets or other similar or comparable element.
  • the magnetic element or elements 25 are disposed annularly around a zone in which the tube 11 is fed, in proximity to the bending member 12, defining an interspace between it and the bend core 16 in which the tube 11 can be inserted.
  • the permanent magnets 25 thus disposed define, with their magnetic fields, a median zone, axial to the direction of feed "F", of magnetic balance.
  • the bend core 16 is disposed with its support bar 19 in this median zone of magnetic balance.
  • the support bar 19, being polarized, remains substantially suspended in correspondence to this zone, also absorbing, among other things, the axial forces which they generate during bending.
  • the whole bend core 16 is maintained suspended by the action of the magnetic fields generated by the permanent magnet or magnets 25, so as to allow the feed in the direction "F" required, without risk of interference with possible structures for the support of the bend core 16 in its operating position.
  • the tube 11 is fed from a roll by the action of the unwinding reel 23 in the direction of feed "F", and directed head-wise toward the bending member 12.
  • the leading end of the tube 11 is made to pass inside the holding member in the interspace defined between the permanent magnet or magnets 25 and the bend core 16, so that the latter is disposed in suspension inside the tube 11.
  • the machine 110 comprises a bending member 12, a movement member 113, and a holding member 115, the latter two being of a different conformation than has so far been described.
  • the bending member 12 is the same as that described for the solution in figs. 1, 2 and 3 , and comprises the bend core 16 and the bending arm 17, for bending the tubes 11 fed.
  • the movement member 113 in this case, comprises a motorized unwinding reel 23 able to unwind from a roll the tube 11 to be bent, and a movement pincers 123 disposed downstream of the unwinding reel 23 and upstream of the bending member 12, with respect to the direction of feed "F".
  • the tube 11 is fed head-wise in the same direction of feed "F", and in the same sense, both by means of the unwinding reel 23 and also by means of the movement pincers 123.
  • the holding member 115 comprises a first gripping pincers 26 and a second gripping pincers 27 disposed in cooperation with the bend core 16, in order to keep it in a suspended condition, acting on one side of the tube 11.
  • first gripping pincers 26 is suitable to cooperate with a tail end of the support bar 19 of the bend core 16; while the second gripping pincers 27 is suitable to cooperate with the contrasting ogive 20 of the bend core 16.
  • the operating sequence of the two gripping pincers 26 and 27 will be described in detail hereafter.
  • the machine 110 in this case also comprises a cutting tool 122, for example a milling cutter or other, in this case disposed upstream of the first gripping pincers 26, and able to cut to size a segment of tube 11 before bending.
  • a cutting tool 122 for example a milling cutter or other, in this case disposed upstream of the first gripping pincers 26, and able to cut to size a segment of tube 11 before bending.
  • the tube 11 is initially unwound from a roll by the action of the unwinding reel 23, and moved in the direction of feed "F" by the feed member 113, and directed head-wise toward the bending member 12.
  • the bend core 16 is kept in a suspended condition by the action of the second gripping pincers 27.
  • the unwinding reel 23 stops the feed of the tube 11 and the cutting tool 122 cuts to size the segment of tube 11 to be bent.
  • the segment is associated to the movement pincers 123.
  • two cutting units can be provided, in which a first cuts one segment made from multiples of the product, and a second is positioned after the bending member 12 and cuts to size the bent tube.
  • the unwinding reel 23 partly recovers the tube 11, separating from the cut segment, and freeing a back section of the support bar 19 of the bend core 16.
  • the first gripping pincers 26 is brought into cooperation with this back section of the support bar 19, and subsequently the second gripping pincers 27 is discharged, releasing the contrasting ogive 20.
  • the bending machine according to the present disclosure is shown in its entirety with the reference number 210.
  • the machine 210 comprises a bending member 12, a movement member 213, and a holding member 215, the latter two having a conformation different from both the solutions so far described.
  • the bending member 12 is the same as that described for the previous solutions and comprises the bend core 16 and the bending arm 17.
  • the tube rather than being fed from a roll, is fed in bars 211 of a length substantially multiple to the length of the individual segments to be bent.
  • the movement member 213 comprises movement pincers 223 disposed in cooperation with a back end of the bar 211, in order to determine a movement thereof toward the bending member 12 in the direction of feed F.
  • the holding member 215 comprises a support bar 219 directly connected to the back part of the contrasting ogive 20 of the bend core 16.
  • the support bar 219 is made of flexible material, with articulated meshes or other, so as to be able to feed the contrasting ogive 20 from the back surface of the tubular bar 211, with a curvilinear path, and in any case guarantee sufficient rigidity in the operating position of the contrasting ogive 20.
  • the machine 210 in this case also comprises a cutting tool 222, for example a milling cutter or other, in this case disposed upstream of the bending arm 17, and able to cut to size a segment of tube 11 after bending.
  • a cutting tool 222 for example a milling cutter or other, in this case disposed upstream of the bending arm 17, and able to cut to size a segment of tube 11 after bending.
  • the tubular bar 211 is initially fed from a store and disposed in the direction of feed F. From here the movement pincers 223 feed the bar 211 head-wise toward the bending member 12.
  • the bend core 16 is inserted axially to the bar 211 from a back end of the latter, until it reaches the position of cooperation, inside the bar 211, with the bending arm 17.
  • the bar 211 is then progressively fed by the movement pincers 233 to carry out the desired bends.
  • the cutting tool 222 cuts the segment to size, in order to resume the bending cycle of a new section of the bar 211, always fed head-wise.
  • cutting tools 22, 122, 222 are disposed downstream of the bending member 12, or in another position with respect to the bending member 12, depending on the different operating conditions.
  • the support bar 19 is polarized by means of a magnetic core, or an electric current or other known polarization system, able to generate a magnetic field contrasting the action of the field generated by the permanent magnets 25, or by the electro-magnets.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP15201261.3A 2009-11-18 2010-11-17 Verfahren zum biegen von rohrförmigen produkten Active EP3031542B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITUD2009A000205A IT1396811B1 (it) 2009-11-18 2009-11-18 Macchina per la piegatura di prodotti tubolari e relativo procedimento di piegatura.
EP10805630.0A EP2501503B1 (de) 2009-11-18 2010-11-17 Maschine zum biegen von rohrförmigen produkten und rohrbiegeverfahren
PCT/IB2010/002931 WO2011061599A1 (en) 2009-11-18 2010-11-17 Machine for bending tubular products and tube bending method

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP10805630.0A Division-Into EP2501503B1 (de) 2009-11-18 2010-11-17 Maschine zum biegen von rohrförmigen produkten und rohrbiegeverfahren
EP10805630.0A Division EP2501503B1 (de) 2009-11-18 2010-11-17 Maschine zum biegen von rohrförmigen produkten und rohrbiegeverfahren

Publications (2)

Publication Number Publication Date
EP3031542A1 true EP3031542A1 (de) 2016-06-15
EP3031542B1 EP3031542B1 (de) 2022-12-28

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ID=42262342

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15201261.3A Active EP3031542B1 (de) 2009-11-18 2010-11-17 Verfahren zum biegen von rohrförmigen produkten
EP10805630.0A Active EP2501503B1 (de) 2009-11-18 2010-11-17 Maschine zum biegen von rohrförmigen produkten und rohrbiegeverfahren

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP10805630.0A Active EP2501503B1 (de) 2009-11-18 2010-11-17 Maschine zum biegen von rohrförmigen produkten und rohrbiegeverfahren

Country Status (5)

Country Link
US (1) US20120227456A1 (de)
EP (2) EP3031542B1 (de)
ES (1) ES2569374T3 (de)
IT (1) IT1396811B1 (de)
WO (1) WO2011061599A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103084448B (zh) * 2013-01-23 2016-01-20 上海开宝耐火材料有限公司 用于长钢管成形的小回转半径弯管机成形机构
ITUB20160975A1 (it) * 2016-02-23 2017-08-23 Simat S R L Macchina e procedimento per la piegatura di un prodotto tubolare
CN107755563B (zh) * 2017-12-18 2024-05-14 张家港兴宇机械制造有限公司 弯管机中的管件夹持机构
CN117621420B (zh) * 2023-12-04 2024-05-28 上海赋贝机电设备有限公司 一种尼龙管弯管机用磁悬浮芯棒输送装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH59706A (de) * 1912-11-09 1913-06-02 Ludwig Vogel Rohrbiegevorrichtung
US2996100A (en) * 1957-04-08 1961-08-15 Dravo Corp Method and apparatus for bending pipe to short radh with minimum thinning of the outer wall thickness at the bend
US3155139A (en) * 1961-09-25 1964-11-03 Baldwin Lima Hamilton Corp Mandrel apparatus for tube bending
NL7512602A (nl) * 1975-09-18 1977-03-22 Daiichi Koshuha Kogyo Kk Werkwijze en inrichting voor het continu buigen van gestrekte materialen.
US4085608A (en) * 1977-05-02 1978-04-25 Burr Oak Tool & Gauge Company Return elbow and crossover bender
WO2003045603A1 (en) * 2001-11-30 2003-06-05 M.E.P. Macchine Elettroniche Piegatrici Spa Bending machine for profiles such as reinforcement round pieces or similar
US20040011106A1 (en) * 2002-03-15 2004-01-22 Calsonic Kansei Corporation Pipe bending processing apparatus and pipe bending processing method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054402A (en) * 1976-03-01 1977-10-18 Aktiebolaget Tudor Apparatus for producing tubular sheath-like coverings for electrodes
US6155091A (en) * 1999-02-26 2000-12-05 Arvin Industries, Inc. Mandrel assembly for tube-bending apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH59706A (de) * 1912-11-09 1913-06-02 Ludwig Vogel Rohrbiegevorrichtung
US2996100A (en) * 1957-04-08 1961-08-15 Dravo Corp Method and apparatus for bending pipe to short radh with minimum thinning of the outer wall thickness at the bend
US3155139A (en) * 1961-09-25 1964-11-03 Baldwin Lima Hamilton Corp Mandrel apparatus for tube bending
NL7512602A (nl) * 1975-09-18 1977-03-22 Daiichi Koshuha Kogyo Kk Werkwijze en inrichting voor het continu buigen van gestrekte materialen.
US4085608A (en) * 1977-05-02 1978-04-25 Burr Oak Tool & Gauge Company Return elbow and crossover bender
WO2003045603A1 (en) * 2001-11-30 2003-06-05 M.E.P. Macchine Elettroniche Piegatrici Spa Bending machine for profiles such as reinforcement round pieces or similar
US20040011106A1 (en) * 2002-03-15 2004-01-22 Calsonic Kansei Corporation Pipe bending processing apparatus and pipe bending processing method

Also Published As

Publication number Publication date
ES2569374T3 (es) 2016-05-10
WO2011061599A1 (en) 2011-05-26
EP2501503A1 (de) 2012-09-26
ITUD20090205A1 (it) 2011-05-19
US20120227456A1 (en) 2012-09-13
IT1396811B1 (it) 2012-12-14
EP2501503B1 (de) 2016-01-27
EP3031542B1 (de) 2022-12-28

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