US20110302977A1 - Tube bending machine with an automatic loading system and method for automatic loading of tubes on the bending head of a tube bending machine - Google Patents

Tube bending machine with an automatic loading system and method for automatic loading of tubes on the bending head of a tube bending machine Download PDF

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Publication number
US20110302977A1
US20110302977A1 US13/154,024 US201113154024A US2011302977A1 US 20110302977 A1 US20110302977 A1 US 20110302977A1 US 201113154024 A US201113154024 A US 201113154024A US 2011302977 A1 US2011302977 A1 US 2011302977A1
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United States
Prior art keywords
tube
bending
carrying structure
bending head
head
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Abandoned
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US13/154,024
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English (en)
Inventor
Mauro Broggi
Paolo Bramati
Cesare Moscatelli
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BLM SpA
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BLM SpA
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Assigned to BLM S.P.A. reassignment BLM S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Bramati, Paolo, BROGGI, MAURO, Moscatelli, Cesare
Publication of US20110302977A1 publication Critical patent/US20110302977A1/en
Assigned to PETRA GROWTH FUND III, L.P. reassignment PETRA GROWTH FUND III, L.P. SECURITY AGREEMENT Assignors: PCUC ACQUISITION, LLC
Priority to US15/261,097 priority Critical patent/US9931685B2/en
Abandoned 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/006—Feeding elongated articles, such as tubes, bars, or profiles
    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/12—Bending rods, profiles, or tubes with programme control
    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends

Definitions

  • the present invention relates to a tube bending machine comprising a bending head and an automatic loading system arranged to load a tube to be bent on the bending head. According to a further aspect, the present invention relates to a method for automatic loading of tubes on the bending head of a tube bending machine.
  • tube used in the following description and claims is to be intended as referring also to any other elongated blank, such as a bar or a profiled section.
  • tube bending machine is to be intended as referring also to a machine arranged to bend any other elongated blank, such as a bar or a profiled section.
  • the control unit of the machine is able to determine, on the base of suitable geometrical parameters of the machine, of the tube and of the inclined plane, the exact point where to position a loading tool (which may be either the bending tool normally present on the bending head of the machine or a tool specially designed for this purpose) to take the tube from the inclined plane.
  • a loading tool which may be either the bending tool normally present on the bending head of the machine or a tool specially designed for this purpose
  • the tube is then made available to the bending head in an initial position, for instance the stop position at the bottom of the inclined plane defined by the aforesaid stop members, and is then moved by the bending head directly from this initial position to a final position where it can be clamped by a tube clamp or similar clamping member carried by the machine body.
  • the automatic loading systems for tube bending machines currently available work well with tubes of circular cross-section, but not so well with tubes of non-circular cross-section.
  • tubes of non-circular cross-section there is in fact the problem of properly orienting the tube relative to the loading tool in order to avoid damages to the tube resulting from the tube being clamped with a wrong orientation between the jaws of the loading tool or between the bending tool and the die.
  • the automatic loading systems currently available on the market require a specific loading tool which can be oriented manually or a specific loading fixture designed so as to have exactly the same angle as the one existing between the loading tool and the axis of the tube to be loaded, which obviously involves problems in terms of time and costs for setting and mounting.
  • the invention is based on the idea of providing a tube bending machine comprising:
  • the electronic control unit of the tube bending machine is able to define each time the path of the bending head in the transverse vertical plane and the rotation of the tube-carrying structure about its own axis of rotation, and hence to control the relating driving means accordingly, whereby with the bending head in the respective calculated initial position and with the tube-carrying structure in the respective calculated final position the tube carried by the tube-carrying structure is arranged in the free space of the clamping fixture of the bending head with the desired orientation relative to the clamping fixture and can therefore be correctly clamped by this latter.
  • the tube is not therefore directly moved by means of the bending head from the initial position to the final position on board of the machine, but is first moved by means of the tube-carrying structure from the initial position into an intermediate position (corresponding to the calculated final position of the tube-carrying structure and to the calculated initial position of the bending head) and then moved by means of the bending head from the intermediate position to the final position on board of the machine.
  • the intermediate position is established from time to time by the electronic control unit.
  • the tube can be automatically loaded either with tube bending machines able to perform both right-hand (i.e. in clockwise direction) and left-hand (i.e. in counter-clockwise direction) bending or with tube bending machines able to perform only one type of bending, i.e. only right-hand bending or only left-hand bending.
  • the clamping fixture is formed by the die and by the bending tool already present on the bending head. There is therefore no need to use an additional clamping fixture.
  • the two degrees of freedom of the bending head in the transverse vertical plane are a translational degree of freedom along a horizontal direction and a rotational degree of freedom about an axis perpendicular to the transverse vertical plane.
  • the tube-carrying structure is spaced from the bending head in a direction perpendicular to the transverse vertical plane, thereby allowing the bending head to move freely in that plane with no risk of collisions with said structure.
  • the tube-carrying structure is provided with a feeding device arranged to move the tube carried by the tube-carrying structure towards the bending head, so as to allow the bending head to take the tube carried by the tube-carrying structure when this latter is in the calculated final position.
  • FIG. 1 is a perspective view which shows a tube bending machine provided with an automatic loading system according to a preferred embodiment of the present invention
  • FIGS. 2 and 3 are front elevation views which show on an enlarged scale the tube bending machine of FIG. 1 in the intermediate position taken by the tube during the loading phase, in the case of left-hand bending and in the case of right-hand bending, respectively;
  • FIGS. 4 and 5 are front elevation views which show on a further enlarged scale the tube bending machine of FIG. 1 in the intermediate position taken by a tube of rectangular cross-section during the loading phase, in case of a so-called “upright bending”, i.e. a bending with the main axis of the rectangular cross-section of the tube parallel to the bending axis (axis of the die of the bending head) and in case of a so-called “laid down bending”, with the main axis of the rectangular cross-section of the tube perpendicular to the bending axis, respectively; and
  • FIG. 6 is a front elevation view which shows on an enlarged scale the tube-carrying structure of the tube bending machine of FIG. 1 in the initial position, with a tube of circular cross-section loaded thereon.
  • numeral 10 generally indicates a tube bending machine which in the present case is able to perform both right-hand bending and left-hand bending, but which could also be a tube bending machine able to perform only one of these two kinds of bending.
  • the tube bending machine 10 is substantially of per-se-known type. Therefore, it will not be described in detail with reference to all its the parts, but only those parts which are of some interest for the present invention will be cited and described.
  • the tube bending machine 10 basically comprises a body 12 , on which a tube clamp 13 is arranged, and a bending head 14 supported by the body 12 .
  • the bending head 14 is movable with at least two degrees of freedom in a transverse vertical plane, that is to say, in a vertical plane perpendicular to the tube feed direction (or longitudinal direction).
  • the bending head 14 is rotatably supported by the body 12 about an axis of rotation X 1 parallel to the above-mentioned longitudinal direction (i.e. an axis perpendicular to the transverse vertical plane).
  • the body 12 is slidably supported by a base 16 of the tube bending machine 10 so as to translate along a horizontal direction Y perpendicular to the axis of rotation X 1 (i.e. a direction laying in the transverse vertical plane).
  • the two degrees of freedom of the bending head 14 are the rotation of the bending head 14 about the axis of rotation X 1 and the translation of the body 12 , and of the bending head 14 therewith, in the direction Y. It is however clear that other kinds of movement of the bending head 14 able to provide at least two degrees of freedom in the transverse vertical plane can be conceived. For instance, the bending head 14 could be moved in two perpendicular directions laying in the transverse vertical plane.
  • a bending arm 18 is rotatably mounted on the bending head 14 about an axis of rotation Z perpendicular to the axis of rotation X 1 .
  • the bending arm 18 carries, on diametrically opposite sides of the axis of rotation X 1 , a first bending fixture 20 arranged to perform right-hand bending and a second bending fixture 22 arranged to perform left-hand bending.
  • Each bending fixture 20 , 22 comprises a die 24 which is rotatable about the same axis of rotation as that of the bending arm 18 (axis of rotation Z) and a tool 26 which is slidably mounted on the bending arm 18 along a direction passing through this axis and perpendicular thereto so as to be movable between an open position (or loading/unloading position), in which a tube T to be worked can be inserted into the space between the die 24 and the tool 26 or a worked tube T can be ejected from that space, and a closed position (or working position), in which a tube T to be worked is clamped by the tool 26 against the die 24 .
  • the die 24 and the tool 26 of the bending fixture are used as clamping fixture for loading the tube on the bending head, but the invention can clearly be applied equally well to the case of a tube bending machine the bending head of which is provided with an additional clamping fixture, which is separate from the bending fixture and comprises for instance a pair of clamping jaws movable with respect to each other between an open position, in which they define a free space for insertion of a tube, and a closed position, in which they clamp the tube previously inserted into that space.
  • the tube bending machine 10 is also provided with first driving means arranged to move the above-mentioned parts of the machine, and therefore to move in particular the bending head 14 in the transverse vertical plane by controlling both the rotation of the bending head 14 about the axis of rotation X 1 and the translation of the body 12 along the direction Y, as well as with an electronic control unit arranged to control said first driving means according to suitable programmable operating logics.
  • first driving means and the electronic control unit are of per-se-known type and will not therefore be described in further detail.
  • the tube bending machine 10 further comprises a loading device, generally indicated 28 .
  • the loading device 28 is arranged on a side of the machine, with respect to a vertical plane passing through the axis of the tube clamp 13 (tube feed direction).
  • the loading device 28 is arranged on the left-hand side of the tube bending machine 10 (with respect to the tube feed direction), but could also be arranged on the opposite side of the machine.
  • the loading device 28 is advantageously spaced from the bending head 14 in the longitudinal direction, i.e. in a direction perpendicular to the transverse vertical plane, so as to avoid the risk of contact of the bending head against the loading device during its movement in the transverse vertical plane.
  • the loading device 28 comprises a support frame 30 and an inclined plane 32 supported by the support frame 30 and having an inclination such as to allow a tube T placed thereon to move down by gravity close to the bending head 14 of the tube bending machine 10 .
  • the loading device 28 is provided with stop members 34 for stopping the tube T at the bottom of the inclined plane 32 .
  • the tube bending machine 10 further comprises a tube-carrying structure 36 arranged to receive each time a tube T from the loading device 28 (in the illustrated example, arranged to receive each time a tube T at the bottom of the inclined plane 32 ) and to move it towards the bending head 14 of the tube bending machine 10 by causing it to rotate about an axis of rotation X 2 perpendicular to the transverse vertical plane (hence, in the present case, an axis of rotation parallel to the axis of rotation X 1 of the bending head 14 ), so as to place it in a position such that it can be taken by the bending head 14 .
  • a tube-carrying structure 36 arranged to receive each time a tube T from the loading device 28 (in the illustrated example, arranged to receive each time a tube T at the bottom of the inclined plane 32 ) and to move it towards the bending head 14 of the tube bending machine 10 by causing it to rotate about an axis of rotation X 2 perpendicular to the transverse vertical plane (
  • the tube-carrying structure 36 consists of at least two arms or levers rotatably supported by the support frame 30 about the axis of rotation X 2 .
  • Each arm has, in a free end portion thereof (i.e. in a portion opposite to the portion in which the arm is hinged to the support frame 30 ), a seat 38 adapted to receive a tube T and a locking member (not shown as it is of per-se-known type) movable between an open position, in which the tube T can be inserted into the seat 38 and drawn out from it, and a closed position, in which the tube is locked inside the seat.
  • the seat 38 is defined for instance by a pair of straight sides arranged at a right angle.
  • the tube-carrying structure 36 is preferably provided with a cylinder 40 ( FIG. 1 ) arranged to urge the tube T in the longitudinal direction towards the bending head 14 so as to allow clamping of the tube by the clamping fixture carried by the bending head.
  • a cylinder any other kind of linear actuating device adapted to cause the tube T to move towards the bending head 14 might of course be used.
  • the loading device 28 provided with the inclined plane 32 might also be replaced by any other kind of device adapted to put each time a tube T to be bent on the tube-carrying structure 36 .
  • the loading device might even be omitted, in which case the operation of putting the tube to be bent on the tube-carrying structure would be performed manually by an operator.
  • Second driving means are associated to the tube-carrying structure 36 and are arranged to cause the tube-carrying structure to rotate about the axis of rotation X 2 between an initial position, in which the tube-carrying structure is able to receive a tube T, and a final position, and to move the locking members of the tube-carrying structure between the above-mentioned open and closed positions.
  • the second driving means (associated to the tube-carrying structure 36 ), beyond the first driving means (associated to the body 12 and to the bending head 14 of the tube bending machine 10 ), are controlled by the electronic control unit of the tube bending machine.
  • the electronic control unit of the tube bending machine 10 is arranged to calculate, on the base of suitable geometrical parameters of the machine itself, of the tube-carrying structure 36 , of the loading device 28 (if any) and of the tube T to be worked, the final position of the tube-carrying structure 36 and an initial position of the bending head 14 in the transverse vertical plane such that with the tube-carrying structure 36 in said final position and with the bending head 14 in said initial position the tube T carried by the tube-carrying structure 36 is placed in the free space defined by the clamping fixture of the bending head 14 (in the illustrated embodiment, the free space existing between the tool 26 and the die 24 ), with the clamping fixture in the open position, and can then be locked by the clamping fixture to be taken by
  • the movements of the bending head 14 and of the tube-carrying structure 36 are calculated by the electronic control unit of the tube bending machine 10 so as to ensure that the tube T is positioned in the free space defined by the clamping fixture (free space between the die 24 and the tool 26 ) with the desired orientation, and can then be clamped between these two components of the clamping fixture with no risk of being damaged.
  • the expression “desired orientation” is to be intended, in view of the present invention, as referring to an orientation of the tube-carrying structure 36 (and hence of the tube T carried by it) relative to the bending head 14 in the transverse vertical plane such that the profile of the cross-section of the tube T forms a given angle with the profiles of the contact surfaces of the two components of the clamping fixture (the die 24 and the tool 26 , in case of use of the bending fixture as clamping fixture, or the clamping jaws, in case of use of an additional clamping fixture).
  • the electronic control unit suitably controls the first and second driving means in order to obtain the desired movements.
  • the movement of the bending head 14 and the movement of the tube-carrying structure 36 can take place either in sequence (first the movement of the bending head 14 and then the movement of the tube-carrying structure 36 or vice versa) or at least partially simultaneously.
  • FIGS. 2 and 3 show how the invention allows to load a tube T on the bending head 14 of the tube bending machine 10 both in the right-hand bending configuration, in which case the tube T is put down between the die 24 and the tool 26 of the first bending fixture 20 ( FIG. 3 ), and in the left-hand bending configuration, in which case the tube T is put down between the die 24 and the tool 26 of the second bending fixture 22 ( FIG. 2 ).
  • FIGS. 2 and 3 show how the invention allows to load a tube T on the bending head 14 of the tube bending machine 10 both in the right-hand bending configuration, in which case the tube T is put down between the die 24 and the tool 26 of the first bending fixture 20 ( FIG. 3 ), and in the left-hand bending configuration, in which case the tube T is put down between the die 24 and the tool 26 of the second bending fixture 22 ( FIG. 2 ).
  • FIGS. 1 show how the invention allows to load a tube T on the bending head 14 of the tube bending machine 10 both in
  • FIG. 6 shows the use of the tube-carrying structure 36 for loading a tube T having a circular cross-section, and in particular the arrangement of the tube in abutment against the two perpendicular straight sides of the seat 38 of each of the arms of the tube-carrying structure.
  • the tube-carrying structure 36 is shown in FIG. 6 in the initial position in which it is arranged in such a manner that the seats 38 face towards the inclined plane 32 of the loading device 28 and the tube T can therefore slide down by gravity in the seats 38 upon release of the stop members 34 which lock the tube T at the bottom of the inclined plane.
  • the second driving means cause the tube-carrying structure 36 to rotate by a given angle, which is suitably calculated by the electronic control unit of the tube bending machine 10 , until the tube reaches the respective final position (for instance the position shown in FIGS. 2 to 4 ), calculated in such a manner that the tube T is placed between the die 24 and the tool 26 of the bending head 14 and can therefore be clamped there between.
  • the invention advantageously allows to take into account the orientation of holes, welding beads or other workings which may be present on the tube.
  • the loading of the tube comprises therefore a first step in which the tube is moved, by rotation of the tube-carrying structure about its own axis of rotation from the respective initial position to the respective final position calculated by the electronic control unit, from the respective initial position (for instance the stop position at the bottom of the inclined plane, if any) to a respective intermediate position, and a second step in which the tube is moved by means of the bending head from the respective intermediate position to a respective final position to be clamped by the tube clamp.
  • the tube to be bent can be positioned on the bending head of the tube bending machine with the desired orientation with no need to add a special tool or loading fixture.
  • the invention allows to load automatically a tube both on a machine able to perform both types of bending, i.e. right-hand bending and left-hand bending, and on a machine able to perform only one type of bending.
  • the tube can be loaded automatically to be bent both in the “upright bending” configuration and in the “laid down bending” configuration, also with no need of a special tool or loading fixture.
  • the invention allows to take into account automatically, by calculating in advance the movements of the tube-carrying structure and of the bending head, possible changes in the geometrical parameters of the bending head, of the tube-carrying structure and/or of the tube to be loaded, as well as possible changes in the orientation of holes or welding beads present on the tube to be loaded.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
US13/154,024 2010-06-10 2011-06-06 Tube bending machine with an automatic loading system and method for automatic loading of tubes on the bending head of a tube bending machine Abandoned US20110302977A1 (en)

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Application Number Priority Date Filing Date Title
US15/261,097 US9931685B2 (en) 2010-06-10 2016-09-09 Tube bending machine with an automatic loading system and method for automatic loading of tubes on the bending head of a tube bending machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2010A000491A IT1401361B1 (it) 2010-06-10 2010-06-10 Macchina curvatubi con sistema di caricamento automatico e metodo per il caricamento automatico di tubi sulla testa di curvatura di una macchina curvatubi.
ITTO2010A000491 2010-06-10

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US15/261,097 Active US9931685B2 (en) 2010-06-10 2016-09-09 Tube bending machine with an automatic loading system and method for automatic loading of tubes on the bending head of a tube bending machine

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US (2) US20110302977A1 (it)
EP (1) EP2397242B1 (it)
JP (1) JP5876230B2 (it)
KR (1) KR101849308B1 (it)
CN (1) CN102363172B (it)
BR (1) BRPI1103004B1 (it)
CA (1) CA2742070C (it)
ES (1) ES2581284T3 (it)
HU (1) HUE028696T2 (it)
IT (1) IT1401361B1 (it)
MX (1) MX2011006149A (it)
PL (1) PL2397242T3 (it)
TW (1) TWI606875B (it)

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US9815107B1 (en) * 2016-10-13 2017-11-14 Armo Tool Ltd. Tube handling machine and method
TWI762237B (zh) * 2021-03-12 2022-04-21 喬陞機器股份有限公司 管件上料機

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CN102814366A (zh) * 2012-05-29 2012-12-12 苏州固信自动化科技有限公司 一种数控两头式多轴联动弯曲机的工作方法
CN103042080B (zh) * 2013-01-21 2014-09-17 丹阳荣嘉精密机械有限公司 五轴联动全自动数控弯管机
IT201800010409A1 (it) * 2018-11-16 2020-05-16 Cml Int S P A Macchina per curvare un pezzo allungato senza formazione di grinze
JP7181268B2 (ja) * 2020-11-16 2022-11-30 フタバ産業株式会社 曲管の製造装置、及び曲管の製造方法

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US4311031A (en) * 1978-07-27 1982-01-19 Rigobert Schwarze Pipe bending machine
US4388039A (en) * 1979-10-30 1983-06-14 Rigobert Schwarze Tube feeding device
US6434993B1 (en) * 2001-01-30 2002-08-20 Blm S.P.A. Bending machine for bending threadlike material such as tubes, rods profiles or metal wire
US6694794B2 (en) * 2001-10-02 2004-02-24 Fabbrica Macchine Curvatubi Crippa Agostino S.P.A. Draw-bending machine
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US9815107B1 (en) * 2016-10-13 2017-11-14 Armo Tool Ltd. Tube handling machine and method
TWI762237B (zh) * 2021-03-12 2022-04-21 喬陞機器股份有限公司 管件上料機

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US20160375481A1 (en) 2016-12-29
EP2397242A1 (en) 2011-12-21
BRPI1103004B1 (pt) 2020-04-07
TWI606875B (zh) 2017-12-01
ITTO20100491A1 (it) 2011-12-11
JP2011255421A (ja) 2011-12-22
TW201206587A (en) 2012-02-16
KR101849308B1 (ko) 2018-04-16
ES2581284T3 (es) 2016-09-05
IT1401361B1 (it) 2013-07-18
BRPI1103004A2 (pt) 2014-08-12
HUE028696T2 (hu) 2017-01-30
MX2011006149A (es) 2011-12-09
CA2742070A1 (en) 2011-12-10
CA2742070C (en) 2018-06-19
CN102363172B (zh) 2015-12-16
JP5876230B2 (ja) 2016-03-02
US9931685B2 (en) 2018-04-03
KR20110135336A (ko) 2011-12-16
PL2397242T3 (pl) 2016-09-30
CN102363172A (zh) 2012-02-29
EP2397242B1 (en) 2016-04-06

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