EP0761334B1 - Machine à cintrer des tubes - Google Patents

Machine à cintrer des tubes Download PDF

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Publication number
EP0761334B1
EP0761334B1 EP96111430A EP96111430A EP0761334B1 EP 0761334 B1 EP0761334 B1 EP 0761334B1 EP 96111430 A EP96111430 A EP 96111430A EP 96111430 A EP96111430 A EP 96111430A EP 0761334 B1 EP0761334 B1 EP 0761334B1
Authority
EP
European Patent Office
Prior art keywords
piston
bending
bending machine
force
advance
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.)
Expired - Lifetime
Application number
EP96111430A
Other languages
German (de)
English (en)
Other versions
EP0761334A1 (fr
Inventor
Rigobert Dipl.-Ing. Schwarze
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Individual
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Individual
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7770990&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0761334(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of EP0761334A1 publication Critical patent/EP0761334A1/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
    • 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
    • B21D7/025—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member and pulling or pushing the ends of the work

Definitions

  • the invention relates to a strand bending machine and especially a pipe bending machine.
  • Strand bending machines including pipe bending machines belong, have a bending template against which the bending strand is pressed by a clamping jaw. By turning the bending template, the strand around the Bending template pulled around and thus bent. To the Holding the strand serves as a tensioning device the strand is clamped.
  • This jig is on a dolly, which during the Bending process tracked via a feed drive becomes.
  • a rotary motor is normally used as the feed drive used the one via a drive pinion drives rack connected to the dolly.
  • the feed drive serves essentially only here the positioning of the strand in relation to the bending template and holding and tracking the strand during the bending process.
  • a strand bending machine from which the generic term of Starting claim 1 is known from EP 0 661 115 A1.
  • This strand bending machine is the clamping device on one Dolly attached by a hydraulic Feed device is advanced.
  • the pressure in the Feed device is corresponding to one occurring on the pipe Stretch factor controlled.
  • a position sensor is also available Determination of the actual position of the trolley provided. It force control takes place, the calculated stretching factor represents the leader.
  • the invention has for its object a To create strand bending machine that improved Operation mode enabled.
  • the feed device for the Carriage carrying tensioning device from at least one Piston-cylinder unit, the pressure to apply a predetermined feed force is adjustable.
  • the Feed force by regulating the pressure of the piston-cylinder unit Either kept constant over the entire feed path or changed according to a specific program.
  • the feed device supports the bending process in such a way that it acts as a pressure device with a high reserve of power Push the strand material into the bend.
  • the force control can either be kept constant the feed force take place or depending from the feed position of the trolley or depending on the angle of rotation of the bending template.
  • the jig When making the last bow of the strand the jig can be close to the bending template be moved up while the slide rail is on the page is driven. The function of the slide rail is then immediately perceived by the tensioning device. Because the clamping device with regulated feed force is pressed, it becomes such a short one End section (without slide rail) with regulated Feed force bent.
  • the encoder is a position control of the transport vehicle possible.
  • a position control takes place For example, if the bending tools (bending template and jaw) are open to the pipe that goes into the Clamping device is used in the suitable for bending Bring position, or the pipe or the Strand within a bending sequence to produce the to position the next arc.
  • the Control circuit works the Control circuit as position controller with subordinate force limitation.
  • the bending tools are closed force control, in which the actual value of the feed force, one (constant or changeable over time) The target value is updated.
  • the piston-cylinder unit can reduce the pressures too measured on both sides of the piston.
  • Based on Piston geometry can be used to determine the feed force become.
  • the feed rate is determined by the displacement sensor derived.
  • the pipe bending machine has a machine bed 10, on which a transport carriage 11 along a guide 12 is horizontally movable in the longitudinal direction.
  • the dolly 11 carries a clamping device 13 for clamping of the pipe to be bent 14.
  • the jig 13 can be controlled by a rotary drive 13a its axis can be rotated around the tube 14 for the bending process to bring it into the correct rotary position.
  • the Dolly 11 can in addition to its movement along the guide 12 also in the transverse direction of the tube 14 adjusted horizontally and moved in the height direction become.
  • the tube 14 is moved by moving the feed carriage 11 laterally applied to the bending template 15 by one vertical axis is rotatable.
  • the bending template 15 has a bending groove 16 on its circumference, which approximately takes up half the circumference of the tube 14.
  • a pivot arm 17 is mounted, which carries a jaw 18, which is from a piston-cylinder unit 19 pressed against the bending template 15 becomes.
  • the clamping jaw 18 also contains a bending groove to accommodate the other half of the pipe circumference.
  • the jaw 18 is first against the bending template 15 pressed and then bending template 15 and swivel arm 17 together about their axis rotated or swiveled, with the tube around the bending template is pulled around.
  • All control processes of the pipe bending machine are numerically controlled by the control device 22 and coordinated with each other. This does not only apply to the Sequence of movements of tube bending, but also for that Setting up the positions of the trolley 11, the Bending tools and the rotation and actuation of the Clamping device 13.
  • the feed device 23 for advancing the trolley 11 consists of a piston-cylinder unit 24 with a hydraulic cylinder 25 on its rear end is supported and from which the piston rod 26 is extended.
  • the piston-cylinder unit 24 is on cross rails 27 on the machine bed 10 out and by a (not shown) drive movable.
  • the guide 12 is fixed with the cylinder 25 connected.
  • the front end of the piston rod 26 is with the trolley 11 firmly connected, so that the trolley 11 according to the respective extension length the piston rod 26 is displaced along the guide 12 becomes.
  • Position sensor 29 12 length markings on the guide 28 attached, which is attached to the trolley 11 by a Position sensor 29 are recognized. This position sensor determines the respective longitudinal position of the Transport carriage 11 along the guide 12.
  • the bending template 15 is by a hydraulic drive device 31 from two piston-cylinder units operated in opposite directions via a chain drive (not shown) turned.
  • the feed cylinder 25 contains a piston 32 which is connected to the piston rod 26.
  • the room of the Feed cylinder 25 is divided by the piston 32 into the working chamber 25a and the return stroke chamber 25b.
  • the Working chamber 25a is with a line 40 and the Return stroke chamber 25b connected to a line 41.
  • the lines 40 are connected to a control valve 42, the three different positions A, B and C can take.
  • A connects the valve 42 lines 40 and 41 with a Switch valve 43, which with a pump 44 and a sump 45 is connected and between an open position and a locked position can be switched.
  • the Position B of valve 42 is used for fast feed and position C for the return stroke of the piston 32.
  • a pressure transducer 46 is connected to line 40, which generates a current signal that corresponds to the hydraulic Pressure in line 40 corresponds.
  • a pressure transducer 47 is connected, the one Current signal generated that the hydraulic pressure in the Line 41 corresponds.
  • the outputs of the two pressure transducers 46 and 47 are connected to a controller 48, to the control line 48a the control signal for the Differential valve 42 delivers.
  • the controller 48 calculates from the pressures in chambers 25a and 25b and the sizes of the two piston surfaces A1 and A2 the actual value Fi the feed force acting on the trolley 11.
  • the controller 48 is also provided with a setpoint generator 49 connected, which is a target value Fs of the feed force delivers to the controller 48.
  • This setpoint Fs the Feed force varies depending on, for example of the angle of rotation ⁇ of the bending template 10, the Position encoder 30 is supplied.
  • the setpoint generator 49 contains several curves that the target value Fs of the pressure force as a function of Specify the angle of rotation ⁇ of the bending template 10. To the Setpoint generator can be the desired curve to be selected.
  • the setpoint generator 49 delivers in Dependence on ⁇ the associated setpoint Fs, from which the actual value Fi is subtracted.
  • This regulator which is, for example, a PID controller, delivers via the Control line 48a a control signal to the controlled system, which here consists of the differential valve 42 and the piston-cylinder unit 24 exists.
  • the pressure P1 in the line 40 and the pressure P2 in the Line 41 are the respective converter 46 and 47th fed.
  • the output signal of the converter 46 is with multiplied by a value equal to the area A1 of the piston 38 corresponds.
  • the output signal of the converter 47 is multiplied by a value equal to the size of the area A2 of the piston 38 corresponds. This will make the products P1 x A1 and P2 x A2 formed. Any of these products is a measure of one of the two opposing forces interact with each other on the piston 38.
  • the the two products are subtracted from each other so that the actual value Fi of the feed force arises. This is actual is subtracted from the setpoint Fs to the control signal for the control units 48a.
  • the controller 48 also receives the position signal of the Position sensor 29, the position of the trolley 11 notes.
  • the controller 48 can operate in one mode "Position control” can be moved in the he the position of the trolley 11 to a predetermined Sets target value. For example, this is with open bending tools, when the pipe to carry out a bending process on the bending template 15 should be positioned. Then when the bending tools are closed, the controller 48 on the "Force control" operating mode switched, iri der der Pressure in the working chamber 25a of the feed cylinder is regulated so that the feed force is equal to that Target value is made.

Landscapes

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

Claims (6)

  1. Machine à cintrer des tubes avec
    un dispositif de serrage (13) maintenant la ligne de tubes à cintrer,
    un gabarit de cintrage (15) pouvant être entraíné en rotation,
    une mâchoire de serrage (18) appuyant la ligne de tubes contre le gabarit de cintrage (15),
    un chariot de transport (11) portant le dispositif de serrage (13),
    un transmetteur de position (29) pour la détermination de la position réelle du chariot de transport (11), et
    un dispositif d'avancement (23) entraínant le chariot de transport (11) et comprenant au moins une unité piston-cylindre (24) hydraulique, dont la pression peut être modifiée,
       caractérisée
    en ce que l'unité piston-cylindre (24) peut être exploitée dans un mode de réglage de force dans lequel sa pression peut être réglée pour appliquer une force d'avancement prédéfinie,
    en ce qu'il est prévu un mode de réglage de position dans lequel la position réelle du chariot de transport (11) est asservie à une position de consigne,
    et en ce que le mode d'exploitation du dispositif d'avancement (23) peut être choisi entre le mode de réglage de force et le mode de réglage de position.
  2. Machine à cintrer des tubes selon la revendication 1, caractérisée en ce qu'une limitation de la pression agissant sur l'unité piston-cylindre (24) intervient dans le mode de réglage de position.
  3. Machine à cintrer des tubes selon la revendication 1 ou 2, caractérisée en ce qu'un appareil (46, 47, 48) est prévu pour l'enregistrement de la valeur réelle (Fi) de la force d'avancement appliquée par l'unité piston-cylindre (24), et en ce qu'un régulateur (48) réajuste la valeur réelle (Fi) de la force d'avancement en fonction d'une valeur de consigne (Fs) fournie par un générateur de valeur de consigne (49).
  4. Machine à cintrer des tubes selon la revendication 3, caractérisée en ce que le générateur de valeur de consigne (49) définit la valeur de consigne (Fs) en fonction de l'angle de rotation (α) du gabarit de cintrage (15) ou en fonction de la position d'avancement du chariot de transport (11).
  5. Machine à cintrer des tubes selon la revendication 3, caractérisée en ce que l'appareil pour l'enregistrement de la valeur réelle (Fi) de la force d'avancement présente deux capteurs de pression (46, 47) qui enregistrent les pressions des deux côtés du piston (32) de l'unité piston-cylindre (24).
  6. Machine à cintrer des tubes selon l'une quelconque des revendications 3 à 5, caractérisée en ce que le régulateur (48) commande une soupape de réglage (42) à courbe caractéristique d'étranglement continue, qui fait varier les pressions des deux côtés du piston (32) en sens opposés l'une de l'autre.
EP96111430A 1995-09-01 1996-07-16 Machine à cintrer des tubes Expired - Lifetime EP0761334B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19532261A DE19532261A1 (de) 1995-09-01 1995-09-01 Strangbiegemaschine
DE19532261 1995-09-01

Publications (2)

Publication Number Publication Date
EP0761334A1 EP0761334A1 (fr) 1997-03-12
EP0761334B1 true EP0761334B1 (fr) 2000-10-18

Family

ID=7770990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96111430A Expired - Lifetime EP0761334B1 (fr) 1995-09-01 1996-07-16 Machine à cintrer des tubes

Country Status (4)

Country Link
US (1) US5678441A (fr)
EP (1) EP0761334B1 (fr)
CA (1) CA2184460C (fr)
DE (2) DE19532261A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2826889B1 (fr) * 2001-07-06 2003-10-03 Silfax Chariot pour machine a cintrer les tubes
US7032423B2 (en) * 2003-02-28 2006-04-25 Cml International S.P.A. Hydraulic circuit for linearly driving a machine-tool slider in both directions
US8689599B2 (en) * 2003-08-28 2014-04-08 Timberline Tool, L.L.C. Clamp and repair tool
US7765841B2 (en) * 2006-02-16 2010-08-03 Oes, Inc. Quality analysis of tube bending processes including mandrel fault detection
USD667469S1 (en) * 2012-04-02 2012-09-18 Greenlee Textron Inc. Portable bending table
CN103272899A (zh) * 2013-06-20 2013-09-04 张家港市明华机械制造有限公司 一种弯管机
US10150154B2 (en) 2013-11-14 2018-12-11 Robert Kyle Hughes, JR. Tube bending machine with reversible clamp assembly
USD755861S1 (en) * 2014-08-15 2016-05-10 Trumpf Gmbh + Co. Kg Bending machine
JP1539124S (fr) * 2014-08-15 2015-11-30
CN108326092B (zh) * 2018-01-26 2019-04-26 重庆安布伦斯科技有限公司 一种用于担架管材的弯曲方法
CN113814303B (zh) * 2021-09-24 2023-06-02 津上精密机床（浙江）有限公司 一种校直折弯设备
DE102023101205A1 (de) 2023-01-18 2024-01-04 Thyssenkrupp Ag Rohrbiegemaschine

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2257368A1 (de) * 1972-11-23 1974-06-12 Schwarze Rigobert Verfahren und vorrichtung zum betrieb einer rohrbiegemaschine
DE2304838C2 (de) * 1973-02-01 1982-08-19 Deutsche Babcock Ag, 4200 Oberhausen Rohrbiegevorrichtung
JPS58205620A (ja) * 1982-05-26 1983-11-30 Hitachi Ltd パイプ曲げ加工装置
US4970885A (en) * 1989-06-12 1990-11-20 Vickers, Incorporated Tube bending apparatus
US4959984A (en) * 1989-08-17 1990-10-02 Ap Parts Manufacturing Company Precision bending apparatus
DE4129478A1 (de) * 1991-09-05 1993-03-11 Schwarze Rigobert Verfahren zur steuerung einer rohrbiegemaschine
US5426965A (en) * 1993-05-25 1995-06-27 Eaton Leonard, Inc. Carriage boost drive
US5343725A (en) * 1993-07-07 1994-09-06 Eagle Precision Technologies Inc. Tube bending apparatus and method
US5481891A (en) * 1993-12-20 1996-01-09 Eagle Precision Technologies Inc. Tube bending apparatus and method

Also Published As

Publication number Publication date
CA2184460A1 (fr) 1997-03-02
US5678441A (en) 1997-10-21
DE59606010D1 (de) 2000-11-23
DE19532261A1 (de) 1997-03-06
CA2184460C (fr) 2007-08-07
EP0761334A1 (fr) 1997-03-12

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