EP0362698A2 - Machine pour le cintrage automatique de tubes et objets similaires - Google Patents

Machine pour le cintrage automatique de tubes et objets similaires Download PDF

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Publication number
EP0362698A2
EP0362698A2 EP89117976A EP89117976A EP0362698A2 EP 0362698 A2 EP0362698 A2 EP 0362698A2 EP 89117976 A EP89117976 A EP 89117976A EP 89117976 A EP89117976 A EP 89117976A EP 0362698 A2 EP0362698 A2 EP 0362698A2
Authority
EP
European Patent Office
Prior art keywords
machine
bending
carriage
operatively connected
tube
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.)
Withdrawn
Application number
EP89117976A
Other languages
German (de)
English (en)
Other versions
EP0362698A3 (fr
Inventor
Aldo Marelli
Alessandro Ferrari
Matteo Piccoli
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.)
BLM SpA
Original Assignee
BLM SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BLM SpA filed Critical BLM SpA
Publication of EP0362698A2 publication Critical patent/EP0362698A2/fr
Publication of EP0362698A3 publication Critical patent/EP0362698A3/fr
Withdrawn legal-status Critical Current

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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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved 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
    • 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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/10—Bending tubes using mandrels or the like by passing between rollers

Definitions

  • the above invention relates to a machine for the automatic bending of pipes and similar workpieces.
  • tube bending machines in various fields of technology, for example to produce chair frames, tube coils for holding liquids or gases, frame parts for the manufacture of bicycles and motor vehicles, exhaust systems for motor vehicles or other tube pieces with several bends which are suitable for the Manufacture of fuel lines for motor vehicles.
  • tube bending machines In order to bend such workpieces, tube bending machines are usually used which have a fixedly arranged tool which receive a groove corresponding to the diameter of the tube to be bent, and a bending head which has a radius corresponding to the bending to be carried out.
  • the tube In the well-known machines the tube is usually bent using a bending tool which can be pivoted about the axis of a fixed bending head. The extent of the bend to be made is determined by the angle of the pivoting movement.
  • Another disadvantage of the known bending machines is the fact that the speed at which the bending process can be carried out and thus the level of performance of the machine is very modest, the costs for the tools that have to be manufactured for each pipe diameter and for each bending radius are significant.
  • the disadvantage can also be ascertained that three-dimensional bending processes, in which the bending course runs in space, only with Difficulties or not feasible at all.
  • the object of the above invention is to avoid the disadvantages of the prior art and to provide an automatically operating bending machine with which it is possible to carry out bending processes with a fixed radius or bending processes with a variable radius automatically, at high speed and with improved efficiency, the bending process Bending curves can also be carried out with a very large radius and especially with a three-dimensional course in space.
  • a bending device 1 is arranged on the front of the machine.
  • the bending device 1 consists of several pairs of rollers 2, 3 which are provided for guiding the tube (T) during its advancing movement in the direction of the arrow (Y).
  • a further pair of rollers 4, 5 is provided in front of the pairs of rollers 2, 3, which serve to reliably guide the tube.
  • the rollers 4 and 5 represent the actual bending tools.
  • the bending rollers 4 and 5 are independent of one another and can be driven in the direction of the axis (X) transversely to the pipe to be bent. Furthermore, the bending rollers 4 and 5 are individually from a bending position in which a roller is located in the plane of the fixedly arranged roller pairs 2 and 3, into a lower level (as shown in FIGS. 1, 2, 3 and 4 with dashed lines) lowerable. By lowering a roller, the swiveling movement of the tube (T) can take place freely and unhindered during the bending process.
  • the corresponding devices are described in more detail below.
  • the tube (T) in Direction of the arrow (b) can be rotated, ie around its own longitudinal axis. This creates the possibility of performing both right-handed and left-handed bending processes using the same bending roller 4 or 5. Furthermore, it is possible to carry out three-dimensional bends, ie bends arranged in space, in order to produce a bend body bent in space.
  • the bending roller 4 is arranged after the guide rollers 2 and 3 in the working position, whereas the bending roller 5 (shown with a broken line) has been lowered into a plane which is below the bending plane of the machine.
  • Fig. 2 the bending process of the pipe piece, which is deformed with a radius (r) and a right-hand bend, is shown.
  • a controlled movement of the bending roller 4 in direction (X) takes place during the longitudinal advance of the tube (T) in direction (Y).
  • the tube (T) is rotated about its own longitudinal axis, as z. B. is represented by the arrow (b).
  • Fig. 3 can be seen that with further use of the bending roller 4 with further advance of the tube in the direction (Y) the next bending process with radius (r) is carried out right-handed, whereby the tube (T) is given a bend that leads to a tube with an S-shaped course.
  • the axes (Y, X) and (b) are advantageously under the direct control of an NC unit known for machine tools, as will be described in more detail below.
  • FIG. 5 shows the bending machine according to the invention in a top view.
  • the machine is identified as a whole by reference number 6
  • the machine 6 On the front, the machine 6 has the bending unit, which is identified overall by 1.
  • the roller pairs 2 and 3 are received by slides which are connected to piston-cylinder units 7 and 8, which ensure that the guide rollers 2, 3 are pressed against the wall of the tube (T) with considerable force. This ensures that the pipe is guided safely achieved.
  • the bending rollers 4 and 5 are received by slides, which are arranged displaceably in longitudinal guides 9.
  • the displacement takes place with the aid of piston-cylinder units which can be moved into a working position (solid lines) or into a rest position below the feed plane of the tube (shown with a broken line).
  • the receiving devices of the bending rollers 4 and 5 are operatively connected to a threaded spindle 11 via a slide 10.
  • the threaded spindle is advantageously designed (greater accuracy) as a ball screw.
  • This ball screw 11 is connected to a pulley 12 to which a belt 13 is operatively connected, advantageously a toothed belt, which is driven by a motor 14 (advantageously a controllable motor, e.g. a controllable direct current motor).
  • a controllable motor e.g. a controllable direct current motor
  • the controllable motor 14 and the encoder 15 are operatively connected to an NC device of the machine.
  • the machine 6 according to FIG. 5 has two parallel guides 16 and 17. These guides accommodate a carriage 18.
  • the carriage 18 has a head 19 for rotating the tube (T).
  • the head 19 will be described in more detail below.
  • the carriage 18 has a drive motor 20 which is equipped with a gear 21 which is operatively connected to a gear 22.
  • the gearwheel 22 meshes with a toothed rack 24 which extends parallel to the guide 17.
  • the gear wheel 22 is also operatively connected to an encoder or similar position indicator 23.
  • the encoder 23 is also connected to an NC device.
  • the carriage 18 can be moved in "overdrive” in order to move the head 19 into a desired working position.
  • a further controllable motor is provided between the guides 16 and 17, which is identified by 25.
  • the is also advantageous Motor 25 is operatively connected to an encoder 40 and is controlled via the NC device of the machine.
  • the motor 25 has a pulley 26 which, with the aid of a toothed belt 27, acts on a ball screw 28 which is operatively connected to the carriage 18.
  • the ball screw 28 is assigned a clutch with connecting jaws, clutch plates or clutch claws, and suitable control means are used , which ensure that when the motor 20 is driven to carry out the "rapid drive” of the carriage 18, coupling parts which are associated with the ball screw 28 are opened, thereby permitting free and rapid displacement of the carriage 18. If, on the other hand, the carriage 18 is to be driven via the motor 25 and the ball screw 28 (precision feed), the components 20, 21, 22 and 23 are out of operation, as a result of which an unobstructed movement can take place via the toothed rack 24.
  • a device 59 which serves as a pull-out device for an elastic core.
  • This core can be inserted into the tube (T), provided that special bending processes or technical features of the Rohres (T) require this.
  • the head 19 has a rotating device (movement b) for the rotation of the tube (T) about its longitudinal axis.
  • the head 19 is connected to a motor 29, advantageously a controllable motor, in particular a controllable direct current motor.
  • the shaft 32 which is operatively connected to the encoder 33, is driven via a pulley 30, which is connected to the motor 29 and a drive belt 31.
  • Both the motor 29 and the encoder 33 are operatively connected to the NC unit (not shown) of the machine.
  • the means for rotating the tube, which are arranged inside the head 19, will be described in more detail below.
  • the machine 6 can be seen in a front view.
  • a device 34 is provided, which is used to guide the power cables.
  • the carriage 18 is slidably mounted on parallel guides 16 and 17.
  • a roller set 35, 36 is provided under the carriage 18 to increase the stability between the carriage 18 and the guides 16, 17.
  • the rollers 35 and 36 are operatively connected to a T-shaped guide bar 37.
  • Fig. 7 can also the arrangement of the rack 24, the with the gear 20, which is driven by the motor 20, can be removed.
  • the gear wheel 22 or the shaft of the motor 20 are operatively connected to an encoder 21.
  • the arrangement of the motor 29 with the encoder 33 can also be seen in FIG. 7. 7 shows the arrangement of the ball screw 28 for driving the carriage 18. Furthermore, the drawing shows the arrangement of an opening in the head 19 for the exit of the tube T.
  • FIG. 8 shows the arrangement of the rack 24 with respect to the parallel guides 16 and 17 of the carriage 18 on the stand of the machine 6.
  • the carriage 18 can be moved along the sliding guides in "overdrive” with the aid of the toothed wheels 20, 22, 23 and the toothed rack 24.
  • the motor 25, as can be seen in FIG. 9, is arranged on the underside of the machine frame 6, it can be seen that the carriage 18 from its position shown in FIG. 8 is in rapid gear to the rear side of the machine 6 , where the device for pulling out the bending core 29 is provided, can be moved.
  • the tube (T) is detected with the aid of the tensioning device of the head 19 in order to be fed to the bending device 1.
  • the carriage 19 is advantageously equipped with the aforementioned ball or roller strips 41 and 42.
  • this In the interior, approximately in the middle of the car body 18, this has actuatable jaws 43. These jaws are also shown in Fig. 9 in a position 43 ', which corresponds to the actual working position of the car, i.e. in that position in which the carriage 18 and the head 19 'are connected by the jaws 43' to the ball screw 28.
  • the spindle 28 is driven by the controllable motor 25 and the exact position of the carriage 18 or the spindle 43 is determined with the aid of an encoder 40.
  • the signals from the encoder are continuously transmitted to the NC control unit of the machine. 9, the carriage 18 in an almost completely retracted position Position shown in which the clutch 43 is also in the working position (the clutch is installed in the carriage 18), according to FIG. 10, the carriage 18, the head 19 and the coupling 43 are maximally moved in the direction of the bending unit 1.
  • the ends of the spindle 28 are particularly advantageously received by strong ball bearings, which are identified by 44 and 45.
  • the arrangement of the motor 25, the belt 27 and the pulley 26, which is operatively connected to the spindle 28, can be seen again schematically in FIG. 10.
  • the carriage 18 is advantageously designed in the manner of an overturned U. This makes it possible to run over the unit 26, 27 without a disturbing obstacle if the feed movement takes place at high speed and with the aid of the gear means 20, 21, 22 and 23 and the rack 24.
  • FIG. 11 shows further details of the machine 6 in a front view similar to FIG. 7.
  • the head 19 has an opening 46 on its front for the exit of the tube (T).
  • the tube (T) is driven by the carriage 18 which is driven by the ball screw 28 which is surrounded by the clutch 43, the clutch shoes being operatively connected to actuators 47 and 48 which are hydraulically driven and ensure a positive connection between the ball screw 28 and the clutch 43, so as to create a precision feed.
  • the drive means 47, 48 are released from the clutch 43 for the operative connection with the ball screw 28 when the carriage 18 is to be driven at high speed with the aid of the motor 20.
  • the motor 20 acts on the gearwheel 22, whereby a movement of the carriage 18 via the operative connection with the rack 24 is possible.
  • the carriage 18 is additionally guided by profiled rollers 35 and 36, which are pretensioned under certain circumstances and are operatively connected to a T-shaped guide bar 37 which extends parallel to the guides 16 and 17.
  • the guides 16 and 17, as shown in FIG. 11, can be assigned laterally so-called ball strips 49 and 50, which promote the precise guidance and the precise movement of the carriage 18.
  • Collets 51 are provided in the interior of the head 19 and can be actuated hydraulically, pneumatically or mechanically.
  • the collets 51 have the task of clamping or releasing the tube T inside the head 19.
  • the head 19 has a rotatable tubular sleeve 52 inside, which is mounted using ball bearings 53.
  • a sleeve 54 is connected to a gear wheel 54, and a thread 55 with endless toothing is in operative connection with this gear wheel 54.
  • the threaded spindle 55 is operatively connected via a shaft 32 and a toothed belt 31 to a flange or a gear 30 of a controllable motor 29.
  • the motor 29 is controlled by the NC control device of the machine tool.
  • the shaft 32 is connected to an encoder 33.
  • This encoder 33 is also operatively connected to the NC device of the machine.
  • the right end of the machine tool 6 receives a device 59 for extracting any elastic bending cores that may be used, which can be inserted into the tube (T).
  • the device 59 is used to loosen the bending core (not shown), which was inserted into the tube (T) before carrying out the bending process and z. B. due to the deformation of the tube T, was jammed in this.
  • the unit 59 is firmly connected to the body of the machine 6 and consists essentially of a piston-cylinder unit 56 which acts on a pin 57 to move this pin 57 in the direction of arrow (e).
  • the pin 57 is connected to the core insert of the tube (T) and, when the core is to be pulled out of the tube (T), the piston-cylinder unit 56 is driven, which causes the core insert to be released inside the tube (T) . Subsequently, the core insert can be easily removed.
  • the carriage 18 With the aid of the motor 20, the carriage 18 is moved with the head 19 to the rear right end of the machine 6 in order to allow the pipe (T) which has been inserted into the head 19 to be drawn in. Subsequently, always with the aid of the motor 20, carriage 18 and head 19 are moved in such a controlled manner that the clutch shoes 43 are in the position 43 ', which corresponds to the working position according to FIG. 9. Subsequently, the drive of the motor 20 is interrupted and the clutch 43 is actuated and placed around the ball screw 28. Once the clutch 43 reaches the position 43 ', it is closed to create a precise positive connection between the ball screw 28 and the carriage 18. At the same time, the tube (T) is inside the head 19 with the aid of the collet 51 (FIG.
  • the feed movement of the tube (direction Y) is then carried out with the aid of the motor 25 and the ball screw 28.
  • the tube T is advanced in a highly precise manner in the direction of the bending device 1.
  • the motor 25 is controlled via the NC device of the machine with the aid of the encoder 40, which is operatively connected to the ball screw 28.
  • the bending process of the tube T which is moved forward by the head 19, is carried out by controlled drive (direction X) of the bending rollers 4 and 5 with the aid of the controllable direct current motor 14.
  • the displacement of the bending rollers 4, 5 via the controllable motor 14 is controlled by the encoder 15 (operatively connected to the shaft 11) and via the NC device of the machine.
  • the motor 29 is actuated.
  • the motor 29 actuates a shaft 32, which is operatively connected to an encoder 33.
  • the encoder 33 is also operatively connected to the NC device of the machine.
  • the shaft 32 as can be seen in FIG. 12, has an endless thread which is operatively connected to a gearwheel 54 which is connected to the sleeve-shaped component 52.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP89117976A 1988-09-30 1989-09-28 Machine pour le cintrage automatique de tubes et objets similaires Withdrawn EP0362698A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8822132A IT1227122B (it) 1988-09-30 1988-09-30 Macchina per curvare automaticamente tubi e materiali simili
IT2213288 1988-09-30

Publications (2)

Publication Number Publication Date
EP0362698A2 true EP0362698A2 (fr) 1990-04-11
EP0362698A3 EP0362698A3 (fr) 1990-04-25

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ID=11191969

Family Applications (1)

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EP89117976A Withdrawn EP0362698A3 (fr) 1988-09-30 1989-09-28 Machine pour le cintrage automatique de tubes et objets similaires

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EP (1) EP0362698A3 (fr)
IT (1) IT1227122B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492211A1 (fr) * 1990-12-22 1992-07-01 Walter Späth Procédé de pliage de profilés creux en métal et dispositif pour l'exécution du procédé
EP0963800A2 (fr) * 1998-04-17 1999-12-15 Rasi Maschinenbau Und -Handels Gmbh Dispositif de pliage pour plier des courbures de pliage à faible rayon ou plus faible rayon indépendant de l'outil
DE19830962B4 (de) * 1998-07-10 2005-07-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zum Biegen stangenartiger Werkstücke
US7337642B2 (en) * 2005-06-13 2008-03-04 Shape Corporation Roll-former apparatus with rapid-adjust sweep box
US8333095B2 (en) 2009-09-21 2012-12-18 Shape Corp. Roll former with three-dimensional sweep unit

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1054775A (fr) * 1900-01-01
DE913961C (de) * 1941-06-04 1954-06-24 Bochumer Eisen Heintzmann Biege- und Richtmaschine fuer schwere Profileisen, Schienen u. dgl.
GB856254A (en) * 1956-03-14 1960-12-14 Bochumer Ges Fur Grubenausbau A new or improved method and apparatus for the production of supporting segments
DE1101912B (de) * 1956-07-16 1961-03-09 Peter Wirtz O H G Maschinen Fa Vorrichtung zum Herstellen von Rohrregistern
DE2039344A1 (de) * 1969-08-09 1971-02-18 Perkins Engines Ltd Rohrbiegemaschine
DE1752824A1 (de) * 1968-07-20 1971-04-08 Harten Geb Beers Gertrud Van Numerisch gesteuerte Rohrbiegemaschine
FR2157711A1 (fr) * 1971-10-27 1973-06-08 Automatisme & Technique
US3986381A (en) * 1975-05-05 1976-10-19 Vladimir Nikolaevich Shubin Bending head for a tube bending machine
US4080814A (en) * 1976-10-21 1978-03-28 Eaton-Leonard Corporation Set-up guide for bending machine
GB2165175A (en) * 1984-10-02 1986-04-09 Mauro Meliga Bending machine for pipes
WO1986004837A1 (fr) * 1985-02-20 1986-08-28 Th. Kieserling & Albrecht, Gmbh & Co. Dispositif de cintrage de fils coniques

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1054775A (fr) * 1900-01-01
DE913961C (de) * 1941-06-04 1954-06-24 Bochumer Eisen Heintzmann Biege- und Richtmaschine fuer schwere Profileisen, Schienen u. dgl.
GB856254A (en) * 1956-03-14 1960-12-14 Bochumer Ges Fur Grubenausbau A new or improved method and apparatus for the production of supporting segments
DE1101912B (de) * 1956-07-16 1961-03-09 Peter Wirtz O H G Maschinen Fa Vorrichtung zum Herstellen von Rohrregistern
DE1752824A1 (de) * 1968-07-20 1971-04-08 Harten Geb Beers Gertrud Van Numerisch gesteuerte Rohrbiegemaschine
DE2039344A1 (de) * 1969-08-09 1971-02-18 Perkins Engines Ltd Rohrbiegemaschine
FR2157711A1 (fr) * 1971-10-27 1973-06-08 Automatisme & Technique
US3986381A (en) * 1975-05-05 1976-10-19 Vladimir Nikolaevich Shubin Bending head for a tube bending machine
US4080814A (en) * 1976-10-21 1978-03-28 Eaton-Leonard Corporation Set-up guide for bending machine
GB2165175A (en) * 1984-10-02 1986-04-09 Mauro Meliga Bending machine for pipes
WO1986004837A1 (fr) * 1985-02-20 1986-08-28 Th. Kieserling & Albrecht, Gmbh & Co. Dispositif de cintrage de fils coniques

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
HANDBUCH DER FERTIGUNGSTECHNIK, Band 2/3, 1985, Umformen und Zerteilen, Seiten 1639-1642; Absatz 11.2.4., Numerisch gesteuerte Rohrbiegemaschinen *
TECHNISCHE RUNDSCHAU, 47 (1955.09.23) 40, Seite 19 und Poytechnisch Tijdschrift 11(1956.02.15) 7/8, Seite 173a *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492211A1 (fr) * 1990-12-22 1992-07-01 Walter Späth Procédé de pliage de profilés creux en métal et dispositif pour l'exécution du procédé
JPH04294827A (ja) * 1990-12-22 1992-10-19 Walter E Spath 中空成形物の曲げ方法及び該方法を実施するための装置
EP0963800A2 (fr) * 1998-04-17 1999-12-15 Rasi Maschinenbau Und -Handels Gmbh Dispositif de pliage pour plier des courbures de pliage à faible rayon ou plus faible rayon indépendant de l'outil
EP0963800A3 (fr) * 1998-04-17 2000-04-05 Rasi Maschinenbau Und -Handels Gmbh Dispositif de pliage pour plier des courbures de pliage à faible rayon ou plus faible rayon indépendant de l'outil
DE19830962B4 (de) * 1998-07-10 2005-07-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zum Biegen stangenartiger Werkstücke
US7337642B2 (en) * 2005-06-13 2008-03-04 Shape Corporation Roll-former apparatus with rapid-adjust sweep box
US7530249B2 (en) 2005-06-13 2009-05-12 Shape Corp. Method utilizing power adjusted sweep device
US8333095B2 (en) 2009-09-21 2012-12-18 Shape Corp. Roll former with three-dimensional sweep unit
US8333096B2 (en) 2009-09-21 2012-12-18 Shape Corp. Method of forming three-dimensional multi-plane beam
US8763437B2 (en) 2009-09-21 2014-07-01 Shape Corp. Roll former with three-dimensional sweep unit

Also Published As

Publication number Publication date
EP0362698A3 (fr) 1990-04-25
IT8822132A0 (it) 1988-09-30
IT1227122B (it) 1991-03-15

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