EP0227778A1 - Pipe bending machine - Google Patents

Pipe bending machine

Info

Publication number
EP0227778A1
EP0227778A1 EP19860904262 EP86904262A EP0227778A1 EP 0227778 A1 EP0227778 A1 EP 0227778A1 EP 19860904262 EP19860904262 EP 19860904262 EP 86904262 A EP86904262 A EP 86904262A EP 0227778 A1 EP0227778 A1 EP 0227778A1
Authority
EP
European Patent Office
Prior art keywords
bending
pipes
die
pipe
machine
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.)
Pending
Application number
EP19860904262
Other languages
German (de)
French (fr)
Inventor
Alan Laycock
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.)
INTEGRATED PRODUCTION MACHINES Ltd
Original Assignee
INTEGRATED PRODUCTION MACHINES Ltd
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 INTEGRATED PRODUCTION MACHINES Ltd filed Critical INTEGRATED PRODUCTION MACHINES Ltd
Publication of EP0227778A1 publication Critical patent/EP0227778A1/en
Pending legal-status Critical Current

Links

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
    • 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

  • This invention relates to a pipe or tube bending machine, particularly but not solely to such a machine of the draw bending type.
  • a pipe bending machine having means for holding .two pipes simultaneously and means for performing a like bending operation on the two pipes simultaneously.
  • the machine is a draw bending machine and the two pipes are held and advanced parallel to each other into the bending head.
  • This bending head includes a bending die and a clamp for clamping the two pipes to that bending die: turning of the bending die serves to bend the two pipes whereafter the clamp is released to enable the bending die to be returned to its original position and the pipes to be advanced ready for the next bend to be made.
  • the pipes are arranged to be automatically rotated about their axes if that next bend is to be in a different plane from the previous bend, but they are rotated in opposite senses: thus this preferred embodiment of bending machine is particularly suited to forming "handed" pairs of pipes and the machine will operate with relati ⁇ vely little limitation or risk due to interference be- tween the portions of the two pipes which at any time are downstream of the bending head.
  • Figure 1 is a diagrammatic plan view of the example of pipe bending machine.
  • Figure 2 is a section on the line II-II of Figure 1, on an enlarged scale.
  • the machine comprises a horizontal machine bed 9 mounting a bending head 10 at its forward end.
  • This comprises a bending die 12 of generally cylindrical form and moun ⁇ ted for rotation about its axis, which is disposed verti ⁇ cally.
  • the bending die 12 is formed with two annular grooves 14 spaced apart from each other and being semi ⁇ circular in section.
  • the bending die 12 is provided with a short, flat-faced, tangential extension 12a which has two grooves forming tangential extensions of the grooves 14.
  • a clamp block 16 is provided to co-operate with the extension 12a_ and is formed with two semi ⁇ circular section grooves horizontally across its face, so that it can clamp two pipes 1, 2 against the bending die 12.
  • the clamp block 16 is mounted to an arm 18 for sliding movement by a hydraulic actuator 17 towards and away from the bending die extension 12a,: the arm 18 is mounted for * rotating about the axis of the bending die 12 so that it can be turned with the bending die during a bending operation.
  • T e mounting arrangement of the bending die 12 and clamp arm 18 are shown more specifically in Figure 2.
  • the bending die 12 is mounted to a spindle 40 which is jour- nalled to fixed projections 42 on the front end of the machine bed 9.
  • a sprocket wheel 44 is keyed to spindle 40 and a drive chain 45 is trained about this sprocket to transmit drive from a hydraulic or electric drive means 45a_ ( Figure 1) for turning the bending die 12 about its axis A-A.
  • the clamp arm 18 is generally U- shaped as shown and its two limbs are journalled about the spindle 40: its upper limb carries the clamp block 16 and its actuator 17, whilst its lower limb carries a sprocket 46, a chain 46_a being trained about this to transmit drive from a separate hydraulic or electric drive means 47 ( Figure 1), for turning the clamp arm around the spindle 40 (and hence around the axis A-A).
  • the bending head 10 further comprises a pressure die 20 mounted to the machine bed and having a flat surface formed with two semi-circular section grooves co-opera- ting with the grooves of the bending die.
  • the pressue die 21 is movable towards and away from the bending die by a hydraulic actuator 21, and is mounted so that it will move lengthwise of the pipes during a bending operation.
  • a wiper die 22 may also be provided, fixed to the machine bed 9, and positioned opposite the pre ⁇ ssure die 20 and shaped at its foreward end to fit close against the bending. die 12.
  • the flat rear surface of the wiper die 22 is also provided with two semi-circular section grooves co-operating with the grooves of the pressure die 20.
  • the bending machine further comprises two pipe or tube holders mounted one above the other on a carriage 24: one only of these holders is shown at 26.
  • the carriage 24 is mounted for sliding movement along the length of the machine bed under the power of a motor 25 and v v ia a drive belt 25 ⁇ a.
  • Each pipe holder 26 comprises a cylindrical body through which, in use, the pipe ex ⁇ tends, and is provided with a collet 26a_ which can be applied to grip the pipe.
  • the two pipe holders are mounted so as to be rotatable about their axes and coup ⁇ led to a drive motor 27 on the carriage so that they will rotate through equal angles but in opposite direc ⁇ tions.
  • the machine also comprises two mandrels 28 carried at the ends of respective mandrel rods 30.
  • the mandrels are positioned in the pipes to support the latter inter ⁇ nally immediately upstream of the bend.
  • the mandrel rods are mounted by holders 31 (one shown) to the machine bed beyond the trailing ends of the pipes being processed.
  • the machine is controlled by a computer numerical-con ⁇ trol system 50.
  • the control serves to advance the carriage 24 to position the two pipes correc ⁇ tly, relative to the bending head, ready for the first bend to be made.
  • the pressure die 20 is advanced to press the pipes 1,2 against the bending die 12, and the clamping block 16 is advanced to clamp the two pipes 1,2 securely against the bending die 12.
  • the bend ⁇ ing die 12 and clamp arm 18 are turned together around the axis A-A of the bending die, and through the angle required.
  • the pressure die 20 slides forwardly in following the pipes 1,2.
  • the clamping block 16 is then retracted to free the pipes 1,2 from the bending die 12 and the clamp arm 18 is returned to its initial position.
  • the carriage 24 is next advanced an appropriate amount so as to position the pipes 1,2 correctly for the next bend.
  • the bending die 12 and pressure die 20 are return ⁇ ed to their initial positions. If the next bend in the pipes is to be effected in a different plane from the first bend, then the pipe holders 26 are turned through the appropriate angle (but in opposite direc ⁇ tions, as mentioned above). That next bend in the pipes 1,2 is then carried out in the same manner as explained above, and the whole sequence of steps is repeated for all the following bends which are to be'made in the pipes.
  • the drive means 47 not only serves to return the clamp arm 18 to its initial position also transmits drive to turn the clamp arm 18 in the required direction during the bending operation (drive from the separate drive means 45a. being transmitted to the bending die 12 itself). Instead however, drive may be transmitted only to the bending die (during the bending operation), the bending die itself turning the clamp arm during this phase.

Landscapes

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

Abstract

Une machine de cintrage de tuyaux sert à cintrer deux tuyaux simultanément et est particulièrement indiquée pour produire des paires de tuyaux à symétrie spéculaire. Des organes de maintien (26) supportent les tuyaux parallèlement l'un à l'autre et les font avancer simultanément dans une tête de cintrage. Cette tête de cintrage comprend une matrice de cintrage (12) et un dispositif (16) permettant de fixer les deux tuyaux contre sa surface. La matrice de cintrage est mise en rotation sur son axe pour exécuter le cintrage. Les organes de maintien (26) font tourner les deux tuyaux selon des angles égaux mais opposés afin de sélectionner le plan du prochain cintrage à exécuter.A pipe bending machine is used to bend two pipes simultaneously and is particularly suitable for producing pairs of pipes with specular symmetry. Holders (26) support the pipes parallel to each other and advance them simultaneously in a bending head. This bending head comprises a bending die (12) and a device (16) for fixing the two pipes against its surface. The bending die is rotated on its axis to perform the bending. The holding members (26) rotate the two pipes at equal but opposite angles in order to select the plane of the next bend to be executed.

Description

PIPE BENDING MACHINE
FIELD OF THE INVENTION
This invention relates to a pipe or tube bending machine, particularly but not solely to such a machine of the draw bending type.
BACKGROUND AND SIM1ARY OF THE INVENTION
Hitherto pipe or tube bending machines have been arran¬ ged to handle a single pipe or tube at a- time. We have now devised a bending machine which is arranged to hand¬ le two pipes or tubes simultaneously.
In accordance with this invention, there is provided a pipe bending machine having means for holding .two pipes simultaneously and means for performing a like bending operation on the two pipes simultaneously.
In a preferred embodiment of this invention, the machine is a draw bending machine and the two pipes are held and advanced parallel to each other into the bending head. This bending head includes a bending die and a clamp for clamping the two pipes to that bending die: turning of the bending die serves to bend the two pipes whereafter the clamp is released to enable the bending die to be returned to its original position and the pipes to be advanced ready for the next bend to be made. The pipes are arranged to be automatically rotated about their axes if that next bend is to be in a different plane from the previous bend, but they are rotated in opposite senses: thus this preferred embodiment of bending machine is particularly suited to forming "handed" pairs of pipes and the machine will operate with relati¬ vely little limitation or risk due to interference be- tween the portions of the two pipes which at any time are downstream of the bending head.
BRIEF DESCRIPTION OF THE DRAWINGS
The preferred embodiment of this invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a diagrammatic plan view of the example of pipe bending machine; and
Figure 2 is a section on the line II-II of Figure 1, on an enlarged scale.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings, there is shown a pipe or tube bending machine of the draw bending type. The machine comprises a horizontal machine bed 9 mounting a bending head 10 at its forward end. This comprises a bending die 12 of generally cylindrical form and moun¬ ted for rotation about its axis, which is disposed verti¬ cally. The bending die 12 is formed with two annular grooves 14 spaced apart from each other and being semi¬ circular in section. The bending die 12 is provided with a short, flat-faced, tangential extension 12a which has two grooves forming tangential extensions of the grooves 14. A clamp block 16 is provided to co-operate with the extension 12a_ and is formed with two semi¬ circular section grooves horizontally across its face, so that it can clamp two pipes 1, 2 against the bending die 12. The clamp block 16 is mounted to an arm 18 for sliding movement by a hydraulic actuator 17 towards and away from the bending die extension 12a,: the arm 18 is mounted for* rotating about the axis of the bending die 12 so that it can be turned with the bending die during a bending operation.
T e mounting arrangement of the bending die 12 and clamp arm 18 are shown more specifically in Figure 2. The bending die 12 is mounted to a spindle 40 which is jour- nalled to fixed projections 42 on the front end of the machine bed 9. A sprocket wheel 44 is keyed to spindle 40 and a drive chain 45 is trained about this sprocket to transmit drive from a hydraulic or electric drive means 45a_ (Figure 1) for turning the bending die 12 about its axis A-A. The clamp arm 18 is generally U- shaped as shown and its two limbs are journalled about the spindle 40: its upper limb carries the clamp block 16 and its actuator 17, whilst its lower limb carries a sprocket 46, a chain 46_a being trained about this to transmit drive from a separate hydraulic or electric drive means 47 (Figure 1), for turning the clamp arm around the spindle 40 (and hence around the axis A-A).
The bending head 10 further comprises a pressure die 20 mounted to the machine bed and having a flat surface formed with two semi-circular section grooves co-opera- ting with the grooves of the bending die. The pressue die 21 is movable towards and away from the bending die by a hydraulic actuator 21, and is mounted so that it will move lengthwise of the pipes during a bending operation. A wiper die 22 may also be provided, fixed to the machine bed 9, and positioned opposite the pre¬ ssure die 20 and shaped at its foreward end to fit close against the bending. die 12. The flat rear surface of the wiper die 22 is also provided with two semi-circular section grooves co-operating with the grooves of the pressure die 20.
The bending machine further comprises two pipe or tube holders mounted one above the other on a carriage 24: one only of these holders is shown at 26. The carriage 24 is mounted for sliding movement along the length of the machine bed under the power of a motor 25 and vvia a drive belt 25<a. Each pipe holder 26 comprises a cylindrical body through which, in use, the pipe ex¬ tends, and is provided with a collet 26a_ which can be applied to grip the pipe. The two pipe holders are mounted so as to be rotatable about their axes and coup¬ led to a drive motor 27 on the carriage so that they will rotate through equal angles but in opposite direc¬ tions.
The machine also comprises two mandrels 28 carried at the ends of respective mandrel rods 30. The mandrels are positioned in the pipes to support the latter inter¬ nally immediately upstream of the bend. The mandrel rods are mounted by holders 31 (one shown) to the machine bed beyond the trailing ends of the pipes being processed.
The machine is controlled by a computer numerical-con¬ trol system 50. In use, with two pipes 1, 2 placed over the mandrels and mandrel rods and held in their pipe holders 26, then firstly the control serves to advance the carriage 24 to position the two pipes correc¬ tly, relative to the bending head, ready for the first bend to be made. Then the pressure die 20 is advanced to press the pipes 1,2 against the bending die 12, and the clamping block 16 is advanced to clamp the two pipes 1,2 securely against the bending die 12. Next the bend¬ ing die 12 and clamp arm 18 are turned together around the axis A-A of the bending die, and through the angle required. During this step, the pressure die 20 slides forwardly in following the pipes 1,2. The clamping block 16 is then retracted to free the pipes 1,2 from the bending die 12 and the clamp arm 18 is returned to its initial position.
The carriage 24 is next advanced an appropriate amount so as to position the pipes 1,2 correctly for the next bend. The bending die 12 and pressure die 20 are return¬ ed to their initial positions. If the next bend in the pipes is to be effected in a different plane from the first bend, then the pipe holders 26 are turned through the appropriate angle (but in opposite direc¬ tions, as mentioned above). That next bend in the pipes 1,2 is then carried out in the same manner as explained above, and the whole sequence of steps is repeated for all the following bends which are to be'made in the pipes.
In accordance with a preferred feature, the drive means 47 not only serves to return the clamp arm 18 to its initial position also transmits drive to turn the clamp arm 18 in the required direction during the bending operation (drive from the separate drive means 45a. being transmitted to the bending die 12 itself). Instead however, drive may be transmitted only to the bending die (during the bending operation), the bending die itself turning the clamp arm during this phase.
It will be appreciated that, because when the pipes. are rotated between successive bending operations, they are rotated through opposite directions, there are never¬ theless cases in which interference will occur between the portions of the two pipes which at any time are downstream of the bending head. Preferably however an off-line programming system may be provided for the machine, with its software so arranged that the system will determine and indicate when there would be any interference of the two pipes if processed on the machine according to the program being formulated. Although particularly suited for producing "handed" pairs of pipes, the machine may also be used" to produce two indi¬ vidual pipes simultaneously.

Claims

WHAT IS CLAIMED IS;
1. A pipe bending machine, comprising means for hold¬ ing two pipes simultaneously, means spaced from the holding means and operable to engage the two pipes simult¬ aneously, and driving means for displacing the engaging means to perform a like bending operation on the two pipes simultaneously.
2. A pipe bending machine as claimed in claim 1, which is a draw bending machine, in which the holding means is operable to hold the two pipes parallel to each other, and means are provided for displacing the holding means lengthwise of the pipes to advance the two pipes into said engaging means.
3. A pipe bending machine as claimed in claim 2, in which said engaging means comprises a bending head which includes a bending die having an axis of rotation and a clamp for clamping the two pipes to the bending die and the driving means serves to turn the bending die on its axis to bend the two pipes.
4. A pipe bending machine as claimed in claim 3> in which the holding means comprises means for rotating the pipes about their axes to select the plane of bend, said rotating of the two pipes being in the opposite senses.
5. A pipe bending machine as claimed in claim 4, comprising a computer numerical control system.
6. A pipe bending machine of a draw bending type, comprising a bending head which includes a bending die of generally cylindrical form and a vertically disposed axis of rotation, the. bending die having a peripheral surface which is formed with two annular grooves spaced apart along the axis of the bending die and serving to receive two pipes, a clamp displaceable towards and away from the peripheral surface of the bending die for clamping and unclamping the two pipes against the bending die, holding means spaced from the bending head and provided with two holders for gripping the two pipes parallel to each other, means for displacing the holding means towards the bending head to advance the two pipes into the bending head, and drive means for turning the bending die about its axis to perfor a like bending operation on the two pipes simultaneously.
7. A pipe bending machine as claimed in claim 6, further comprising means for rotating the two pipe hold- ers through equal angles but in opposite senses.
EP19860904262 1985-06-28 1986-06-27 Pipe bending machine Pending EP0227778A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08516365A GB2177035A (en) 1985-06-28 1985-06-28 Pipe bending machine
GB8516365 1985-06-28

Publications (1)

Publication Number Publication Date
EP0227778A1 true EP0227778A1 (en) 1987-07-08

Family

ID=10581457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860904262 Pending EP0227778A1 (en) 1985-06-28 1986-06-27 Pipe bending machine

Country Status (3)

Country Link
EP (1) EP0227778A1 (en)
GB (1) GB2177035A (en)
WO (1) WO1987000097A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4732025A (en) * 1987-05-22 1988-03-22 Ap Industries, Inc. Precision bending apparatus and process
US5315852A (en) * 1993-07-02 1994-05-31 The Babcock & Wilcox Company Rotary draw bending apparatus and method
JP2002192236A (en) * 2000-12-25 2002-07-10 Nhk Spring Co Ltd Bender for long size material
CN109570290B (en) * 2018-10-25 2020-06-09 中国建筑第八工程局有限公司 Pipe machining platform for building construction and pipe bending equipment thereof
CN109158456B (en) * 2018-11-09 2024-05-03 湖北理工学院 Manual pipe bending machine convenient to operation

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB612321A (en) * 1945-01-09 1948-11-11 Lee Britton Green Improvements in or relating to bending machines
US2709473A (en) * 1947-08-18 1955-05-31 Doak Aircraft Co Inc Tube bending machine
GB755231A (en) * 1953-06-10 1956-08-22 Bundy Tubing Co Improvements in apparatus for bending tube
CH409590A (en) * 1959-07-30 1966-03-15 Baehler & Cie Ag Tube bending machine
US3821525A (en) * 1972-03-16 1974-06-28 Conrac Corp Method and apparatus for automatically compensated tube bending
DE2637454C2 (en) * 1976-08-20 1982-07-08 Robert Dipl.-Ing. 5000 Köln Schwarze Device for bending two nested tubes
US4085608A (en) * 1977-05-02 1978-04-25 Burr Oak Tool & Gauge Company Return elbow and crossover bender
FR2432900A1 (en) * 1978-08-11 1980-03-07 Scoiner S Coop Automated programmable tube bending machine - has clamping units acting with bending units and latter include clamping carriages
IT1137724B (en) * 1981-07-10 1986-09-10 Mec Montorfano Di Montorfano V BENDING UNIT FOR METAL PIPES AND WIRES AND START-UP PROCEDURE OF THE UNIT

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8700097A1 *

Also Published As

Publication number Publication date
GB2177035A (en) 1987-01-14
GB8516365D0 (en) 1985-07-31
WO1987000097A1 (en) 1987-01-15

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Inventor name: LAYCOCK, ALAN