EP0320408A1 - Steuerungsvorrichtung für die Reglette einer Rohrbiegemaschine - Google Patents

Steuerungsvorrichtung für die Reglette einer Rohrbiegemaschine Download PDF

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Publication number
EP0320408A1
EP0320408A1 EP88420394A EP88420394A EP0320408A1 EP 0320408 A1 EP0320408 A1 EP 0320408A1 EP 88420394 A EP88420394 A EP 88420394A EP 88420394 A EP88420394 A EP 88420394A EP 0320408 A1 EP0320408 A1 EP 0320408A1
Authority
EP
European Patent Office
Prior art keywords
strip
tube
cylinder
bending
control device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88420394A
Other languages
English (en)
French (fr)
Other versions
EP0320408B1 (de
Inventor
Jean Lafrasse
Jean-Paul Chastan
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.)
Eaton Leonard Picot SA
Original Assignee
Eaton Leonard Picot SA
PICOT
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 Eaton Leonard Picot SA, PICOT filed Critical Eaton Leonard Picot SA
Priority to AT88420394T priority Critical patent/ATE72151T1/de
Publication of EP0320408A1 publication Critical patent/EP0320408A1/de
Application granted granted Critical
Publication of EP0320408B1 publication Critical patent/EP0320408B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D7/02—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

Definitions

  • the present invention relates to machines for bending tubes, and it relates, more particularly, to a control device for the strip of a machine for bending tubes.
  • the bending tool usually comprises: a rotary forming roller, of vertical axis, having at its periphery an annular groove and supporting a first jaw - a second jaw carried by a bending arm mounted pivoting around the vertical axis mentioned above, the second jaw cooperating with the first jaw to grip and drive the tube to be bent - a horizontal strip, parallel to the non-bent part of the tube, located behind the jaws and intended to be applied laterally against the tube to bend.
  • this part is clamped between the two jaws and driven forward by the rotation of the bending arm, so as to wind in the groove of the forming roller.
  • the angle of rotation of the arm determines the bending angle
  • the radius of the forming roller determines the radius of the elbow formed on the tube.
  • the strip is movable relative to the frame, transverse to the initial direction of the tube to be bent, so as to release this tube to allow its introduction, its advance and its withdrawal. In some machines, this strip can also be moved longitudinally to follow the advance of the tube during bending.
  • the bending tube is pinched, in its rectilinear part, by a clamping mandrel carried by a carriage movable in longitudinal direction.
  • the carriage controls the advance of the tube and ensures, in its stopped positions, the positioning of the tube relative to the bending tool, for the production of successive bends on this tube.
  • the strip constitutes by its presence an obstacle to the passage of the carriage, and it must then be retracted laterally. There is, however, no drawback because the tube is held by the clamp of the carriage in its part close to the bending tool.
  • the tube has a portion of considerable length which, when the strip deviates from it, is no longer supported by this strip, and is in door-to-door position. false.
  • mobile supports are provided in particular distributed over the length of the machine frame and controlled either mechanically by the advance of the carriage, or by pneumatic or other means; these supports, supporting the tube at several points, retract one after the other as the carriage advances.
  • Such a set of supports, with their control means, constitutes a complicated, expensive and not very rational device; in particular, the adjustment of the device is inconvenient because it requires intervention on each of the supports.
  • the present invention aims to avoid these drawbacks, by providing a tube support device which is simple, compact, rational and easy to use, the proposed device eliminating all the supports mentioned above, while solving the problem posed by the arrival of the carriage in interference with the strip.
  • the subject of the invention is a control device for a strip for a machine for bending tubes of the type considered here, which comprises, for controlling the movement of the strip during the operating cycle of the machine and transversely to the initial direction of the tube to be bent, on the one hand means for moving this strip motorized over a relatively large stroke, so as to completely release the tube from its clamping position and thus allow the free passage of the carriage , and on the other hand separate means from the preceding means, for moving said strip motorized over a relatively short stroke, so that the tube is released laterally but remains supported by part of the strip.
  • the strip itself provides support for the tube to be bent as long as the carriage remains away from the bending tool. It is only when the carriage interferes with the strip that the latter is spaced apart sufficiently to completely release the tube and allow the carriage to pass.
  • the means for motorized movement of the slide over a relatively large stroke are constituted by a first cylinder
  • the means for motorized movement of the slide over a relatively short stroke are constituted by a second cylinder, the two cylinders being mounted "in series" and being controlled one independently of the other.
  • the first cylinder with a relatively large stroke, connects the support of the strip, which is slidably mounted on guide means carried by the frame of the machine, with the piston of the second cylinder, with relatively stroke weak, whose body is fixed to the machine frame.
  • the second cylinder is actuated, the strip is thus moved over a short stroke through the first cylinder which, not being actuated, then simply plays the role of a transmission rod.
  • the device also advantageously comprises means for manual adjustment of the relative axial position of the first cylinder and of the piston of the second cylinder.
  • adjustment means may take the form of an adjustment screw, mounted to rotate freely in the piston of the second cylinder along the axis of the latter and linked to a flywheel or to a crank, the screw cooperating by its threading with a socket. tapped slidingly mounted in axial direction in the piston of the second cylinder but immobilized in rotation, and fixed to one end of the first cylinder.
  • the machine for bending tubes shown in the drawing and more particularly in Figures 1 to 3, comprises an elongated frame 1 which supports longitudinal guides along which a carriage 2 can be moved.
  • the carriage 2 comprises a clamping mandrel 3, suitable pinching the bending tube 4 while maintaining it along a horizontal axis 5; the carriage 2 allows not only the advancement of the tube 4 along the axis 5, but also the rotation of this tube 4 around said axis 5.
  • a bending tool which mainly comprises: a forming roller 6 of vertical axis 7, having at its periphery an annular groove 8 and supporting a first jaw 9 - a second jaw 10 carried by a bending arm 11 mounted pivoting about the vertical axis 7 - a strip 12 extending parallel to the axis 5 of the tube to be bent 4 and having a longitudinal groove 13.
  • the carriage 2 makes it possible to bring, to the level of the tool previously described, the part of the tube 4 which must be bent.
  • This part of the tube 4 is clamped between the two jaws 9 and 10, and the bending arm 11 is rotated about the vertical axis 7, at a predetermined angle, to wind the considered part of the tube 4 around the forming roller. 6, by engaging it in the annular groove 8 of the roller 6.
  • a motorized control device which moves the strip 12 in a horizontal plane, in a direction transverse to the initial direction of the tube to be bent 4, in other words in a direction perpendicular to the axis 5 of this tube 4.
  • the present invention relates, precisely, to the structure of this motorized control device for the strip 12, which appears in detail in FIG. 4.
  • the strip 12 is carried by a support 14, itself mounted on a movable horizontal slide 15 which slides on a fixed slide 16 mounted on the frame 1 of the machine, as indicated by an arrow 17.
  • the rod 21 of this first cylinder 17 is axially linked to the piston 22 of a second control cylinder 23, the body 24 of which is fixed to the frame 1 by means of a support 25.
  • the first cylinder 18, supplied with pressurized fluid at 26, has a relatively large stroke, which will be specified below by describing the operation of the machine.
  • the second cylinder 23 has a short stroke, for example of a few millimeters, which is designated by C and whose role will also be specified below.
  • This latter jack 23 is supplied with pressurized fluid in two places independently of the first jack 18, as indicated by the respective arrows 27 and 28, for controlling its two movements, namely the advance and the reverse on the stroke C.
  • the device shown in Figure 4 further comprises manual adjustment means, with an outer crank 29 secured to an adjustment screw 30, rotatably mounted in the piston 22 of the second cylinder 23, along the axis 19 of this cylinder.
  • the adjusting screw 30 has a smooth part mounted to rotate freely in the piston 22, but connected axially to this piston 22.
  • the thread of the screw 30 is screwed into a threaded sleeve 31, partially housed in a central recess of the piston 22.
  • the sleeve 31 is itself slidably mounted relative to the body 24 and to the piston 22 of the jack 23.
  • a key 32 prevents rotation of the bush 31 relative to the body 24 of the jack 23.
  • a connecting member such as a screw 33, secures the sleeve 31 with the outer end of the rod 21 of the first cylinder 18.
  • a handle 34 secured to a pressure screw 35, which can be pressed laterally on the adjusting screw 30 to block it in rotation.
  • the strip 12 is controlled as follows by the device described above:
  • the strip 12 is only slightly moved away from the tube 4 to allow the latter to advance between two successive bending operations.
  • the second cylinder 23 is actuated, and this cylinder 23 moves the slide 12 through the first cylinder 18 which then acts as a simple transmission rod. Due to the short stroke C of the second cylinder 23, the strip 12 releases the tube 4 while leaving it engaged partially in the longitudinal groove 13 of this strip 12, as shown in Figure 2 and the dashed line in Figure 4 (left). The tube 4 thus remains supported by a part of the strip 12, as indicated in A.
  • the carriage 2 When the carriage 2 reaches the vicinity of the bending tool and interferes with the strip 12, it is the first cylinder 18 which is actuated so as to transversely move the strip 12 over a large stroke, as illustrated in the figure 3. The carriage 2 with its mandrel 3 can then come up to the height of the bending tool, without encountering any obstacle.
  • the program controlling the movements of the machine automatically determines the intervention of the first cylinder 18 or of the second cylinder 23, as a function of the position of the carriage 2.
  • the adjustment means 29 to 35 make it possible to correct the position of the strip 12, relative to the tube 4, in particular to compensate for any differences in thickness of this strip 12.
  • the crank 29 By turning the crank 29 in one direction or the other, the sleeve 30 is moved relative to the piston 22 of the second cylinder 23, and it is thus possible to slightly shift the initial position of the first cylinder 18, of the support 14 and of the strip 12. It is understood that this adjustment has no influence on the stroke C of the second cylinder 23.
  • the invention is not limited to the only embodiment of this control device for a strip for bending machines which has been described above, for example ; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle.
  • the jacks 18 and 23 can be replaced by other motorized control means, ensuring the same functions vis-à-vis the strip in the operating cycle of the bending machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP88420394A 1987-12-02 1988-11-25 Steuerungsvorrichtung für die Reglette einer Rohrbiegemaschine Expired - Lifetime EP0320408B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88420394T ATE72151T1 (de) 1987-12-02 1988-11-25 Steuerungsvorrichtung fuer die reglette einer rohrbiegemaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8717184A FR2624039B1 (fr) 1987-12-02 1987-12-02 Dispositif de commande pour reglette de machine a cintrer les tubes
FR8717184 1987-12-02

Publications (2)

Publication Number Publication Date
EP0320408A1 true EP0320408A1 (de) 1989-06-14
EP0320408B1 EP0320408B1 (de) 1992-01-29

Family

ID=9357697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420394A Expired - Lifetime EP0320408B1 (de) 1987-12-02 1988-11-25 Steuerungsvorrichtung für die Reglette einer Rohrbiegemaschine

Country Status (5)

Country Link
US (1) US4938048A (de)
EP (1) EP0320408B1 (de)
AT (1) ATE72151T1 (de)
DE (1) DE3868251D1 (de)
FR (1) FR2624039B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108435463A (zh) * 2018-03-28 2018-08-24 无锡裕力机械有限公司 喷水管折动器导正机构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878720A (en) * 1971-12-27 1975-04-22 Tools For Bending Inc Tube shaping apparatus for radius-bending, end-flaring and the like
US4063441A (en) * 1975-09-19 1977-12-20 Eaton-Leonard Corporation Apparatus for bending tubes
GB2098895A (en) * 1981-05-21 1982-12-01 Pressbend Ltd Pipe bending apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3287952A (en) * 1963-04-06 1966-11-29 Hilgers Maschinen Und Appbau A Bending machine
US3410125A (en) * 1967-02-02 1968-11-12 Pines Engineering Co Inc Tubular stock bending machine
US3553990A (en) * 1968-04-23 1971-01-12 Pines Engineering Co Inc Tube bender pressure die interference control
DE2709201A1 (de) * 1976-06-03 1977-12-15 Homer L Eaton Verfahren und maschine zum kaltbiegen von insbesondere metallrohren
US4126030A (en) * 1977-10-03 1978-11-21 Eaton-Leonard Corporation Retractable pressure die

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878720A (en) * 1971-12-27 1975-04-22 Tools For Bending Inc Tube shaping apparatus for radius-bending, end-flaring and the like
US4063441A (en) * 1975-09-19 1977-12-20 Eaton-Leonard Corporation Apparatus for bending tubes
GB2098895A (en) * 1981-05-21 1982-12-01 Pressbend Ltd Pipe bending apparatus

Also Published As

Publication number Publication date
US4938048A (en) 1990-07-03
FR2624039A1 (fr) 1989-06-09
EP0320408B1 (de) 1992-01-29
DE3868251D1 (de) 1992-03-12
FR2624039B1 (fr) 1993-07-02
ATE72151T1 (de) 1992-02-15

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