EP0106030A1 - Machine à cintrer avec mandrin - Google Patents

Machine à cintrer avec mandrin Download PDF

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Publication number
EP0106030A1
EP0106030A1 EP83106995A EP83106995A EP0106030A1 EP 0106030 A1 EP0106030 A1 EP 0106030A1 EP 83106995 A EP83106995 A EP 83106995A EP 83106995 A EP83106995 A EP 83106995A EP 0106030 A1 EP0106030 A1 EP 0106030A1
Authority
EP
European Patent Office
Prior art keywords
mandrel
piston
rod
mandrel rod
measuring
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
EP83106995A
Other languages
German (de)
English (en)
Other versions
EP0106030B1 (fr
Inventor
Rigobert Dipl.-Ing. Schwarze
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0106030A1 publication Critical patent/EP0106030A1/fr
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Publication of EP0106030B1 publication Critical patent/EP0106030B1/fr
Expired 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
    • 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

  • the invention relates to a pipe bending machine with a feed carriage having a clamping sleeve, a bending template with a clamping jaw and an adjacent slide rail and a bending mandrel arranged in the pipe to be bent in the vicinity of the bending template and fastened to the head end of a mandrel bar.
  • mandrel When bending pipes, a mandrel is often used so that the round inner cross-section is preserved or largely preserved during bending. Also for bending two nested tubes, such as e.g. described in DE-OS 27 32 046 by the applicant, mandrels are used.
  • Bending mandrels which come into effect in the area of the bending template and the slide rail, are fastened to a mandrel rod which has a smaller cross section than the bending mandrel.
  • the mandrel rod is attached to the piston of a piston cylinder assembly that advances the mandrel rod with the mandrel for bending and retracts after bending.
  • the pipes to be bent on a pipe bending machine which are pushed over the mandrel and the mandrel rod to load the pipe bending machine, do not always have the guarantee that they are straight.
  • individual pipes can be slightly curved, often as a result of damage during transport.
  • Pipes that are not straight or pipes with a part of the weld projecting inwards make it difficult to push the pipe over the mandrel. Since this sliding is done mechanically, it often happens that ver by bending or by a weld wrinkled inner tube cross-section when pushed over by striking the mandrel against the inwardly projecting tube wall as a result of the reduction in the tube cross-section, the mandrel rod is not only compressed, but in many cases is bent by the sprain so that it becomes unusable and must be replaced with another mandrel rod .
  • a tube provided with a reduced tube cross-section is displaced over the mandrel of the mandrel rod, but leads to such damage to the mandrel rod by bending that this only becomes noticeable when the tube is bent on the bending template, for example in the way that after the bending the retraction or before the bending the advancement of the mandrel over the mandrel bar is difficult or not feasible.
  • Damage to the mandrel or the mandrel rod or consequential damage to other parts of the pipe bending machine, for example the mandrel retraction or the like, is particularly serious in pipe bending machines that work automatically, for example in such a way that the loading for bending and the removal of the bent pipe from the pipe bending machine can be done fully automatically, as described for example in the application according to DE-OS 28 32 980 of the applicant.
  • pipe bending machines with automatic loading and automatic removal, even small deformations of the bending mandrel or its mandrel rod that go beyond a certain tolerance act to severely obstruct the program sequence.
  • the present invention is based on the object of ensuring in a pipe bending machine that the mandrel or the mandrel bar carrying it does not suffer any deformation beyond an adjustable tolerance limit.
  • a feed carriage having a clamping sleeve, a bending template with clamping jaw and an adjacent slide rail and a bending mandrel arranged in the pipe to be bent in the vicinity of the bending template, which is fastened to the head end of a mandrel rod, the rear end of the mandrel rod having a mandrel retraction in the shape of a Piston-cylinder arrangement
  • the mandrel rod is connected or provided with a measuring device which, when the mandrel rod is overstressed, actuates a switching element which switches off or eliminates the overstressing of the mandrel.
  • the proposal according to the invention ensures that when the mandrel rod is stressed beyond an adjustable amount, those measures are taken which eliminate further stress on the mandrel rod.
  • the measures to be carried out can be of many types, depending on the stress through which the mandrel or the mandrel rod carrying it has been overstressed. If, for example, the upper stress on the mandrel or the mandrel rod is carried out by pushing the tube to be bent over the mandrel, then the pushing is stopped with the effect that the excessive stress stops immediately. Then the pipe which is not suitable for bending is automatically removed from the bending machine by the device which it is in the bending machine has been introduced, removed or prepared by machine so that it can be removed from the bending machine by hand.
  • the proposal according to the invention to provide the mandrel bar with a measuring device can be implemented particularly advantageously with the proviso that the mandrel bar is connected or provided with a measuring device at its rear end.
  • This measuring device can detect the axial stress on the mandrel rod and switch it off or eliminate it via a switching element.
  • This measuring device can also separately or additionally detect the torsional or torsional stress on the mandrel rod and switch it off or eliminate it via a switching element.
  • the signals resulting from an overstressing of the mandrel bar can be entered into the computer control of the pipe bending machine, so that in the program control in the event of an overstressing of the mandrel bar provided or necessary Measures are carried out, depending on the respective cause, so that in addition to avoiding damage to the mandrel rod, other consequential damages are also avoided.
  • the further solution according to the invention is particularly advantageous in that the rear end of the mandrel rod is mounted on a housing which is provided with at least one piston-cylinder arrangement for measuring the force exerted on the mandrel rod.
  • This solution thus includes the two measures that the housing of the measuring device carries the mandrel rod at the same time and the excessive stress emanating from the mandrel rod is transferred to a piston-cylinder arrangement, so that the measured value is recorded or determined hydraulically.
  • This solution to transfer the overstressing of the mandrel rod to the piston of a piston-cylinder arrangement, first has the advantage that the hydraulic fluid arranged in the cylinder, in conjunction with corresponding valves, allows a first damping to take place, so that the piston in the piston -Cylinder arrangement via an upper load on the mandrel rod also acts and can act as a shock absorber, so that if too much axial pressure is exerted on the mandrel rod when pushed over it, this is elastic due to the yielding of the mandrel rod or the piston in the cylinder space can be caught.
  • the pressure that can be set for the mandrel can also be measured by the pressure that can be set in the cylinder chamber rod corresponds to damage-free deformation in its elastic or plastic range.
  • the setting of the pressure can be regulated by pressure valves known in the art. Depending on the cross-section and / or the material properties and the length of the mandrel bar, the force is set, beyond which the measures for protecting the mandrel bar and other machine elements take place.
  • the piston consists of a front section which projects from the measuring housing and is connected to the mandrel rod and a rear section which projects into the cylinder space connected to the pressure source and a sensor is arranged on the piston, which cooperates with a switch arranged on the measuring housing.
  • the sensor on the piston protrudes particularly advantageously in the radial direction and interacts with a preferably contactless limit switch.
  • the above-described piston which carries the mandrel rod at the front and engages at its rear end in a cylinder chamber which determines the load, permits the further solution that an essentially radially projecting add-on element is present in the central region of the piston, which in two opposite sides Radial plane extending pistons are associated with cylinders.
  • This solution has the effect that the measuring housing, which measures and evaluates the axial thrust on the piston rod, at the same time also measures the measuring device for the torsional or torsional stress on the mandrel rod, and thus several stresses can be measured or recorded in one measuring housing.
  • the pistons are particularly advantageously designed with an enlarged diameter at their ends facing the assigned cylinder spaces, each cylinder space having two different diameters correspondingly stepped.
  • Another proposal according to the invention is that there is a single measuring pin on the piston for the axial movement and the rotary movement of the mandrel rod, which cooperates with only one contactless limit switch.
  • the contactless limit switch particularly advantageously has a surface lying in the radial plane of the piston and adjoining surfaces that extend obliquely thereto in the manner of a broken edge.
  • the measuring housing is provided on its side facing away from the mandrel rod with a holder for the piston rod of the mandrel retraction in the form of a cylinder connected to the piston rod.
  • FIG. 1 shows a pipe bending machine with the feed carriage 10, which can be pushed back and forth on one or more guide rails 11 on the upper side of the machine housing 12.
  • the feed carriage 10 has a tubular cylinder 13, in the interior of which there is a clamping sleeve 14, in which the tube 15 to be bent is clamped.
  • the tube 15 is guided around a pivotally mounted bending template 16, which has a recess 17 corresponding to the tube radius.
  • the tube 15 is pressed against the bending template via a clamping jaw 18, the clamping jaw being actuated on a clamping device 19 via a hydraulic cylinder 20. Both are arranged on the swivel table 21, which is rotated in the indicated direction 22 of the arrow. 23 is a slide rail.
  • the mandrel 24, which is fastened to the front end of the mandrel rod 25, is present within the tube 15 in the region of the bending template and the slide rail.
  • the mandrel rod itself is mounted on a measuring housing 26, which is provided with a foot 27 on the rail 11 in the axial direction of the pipe to be bent back and forth.
  • the measuring housing 26 is attached to the piston rod 28 of the hydraulic cylinder 29.
  • Components 28 and 29 are also referred to as mandrel retraction. These are carried by the stand 30.
  • the tube bending machine described above also has guides in order to be able to move the slide 10 and the measuring housing 26 or the stand 30 transversely to the longitudinal extent of the tube to be bent, so that an adaptation to the bending radius is possible the template 16 is present.
  • Figures 3 to 5 show a particularly advantageous device for determining and evaluating an upper load on the mandrel or the mandrel bar.
  • the mandrel rod 25 is connected at its rear end to a mandrel sleeve 31.
  • the mandrel sleeve is thus a coupling element. It has a radial bore 32.
  • the sleeve overlaps a piston 33, which is also provided with a radial bore, so that the non-positive connection between the sleeve and piston 33 is provided by a bolt inserted into the two bores.
  • the piston 33 is initially supported in its central region 33b in the measuring housing section 26a. With its rear region 33c it engages in a cylinder space 34 which is arranged in the housing part 26b.
  • the cylinder chamber 34 is provided with a channel 35 so that an oil pressure adjustable pressure is available via a connection 36.
  • This adjustable oil pressure is carried out using means known per se, for example corresponding pressure valves.
  • the housing ring 26c, to which the piston rod 28 is fastened, is flanged to the housing 26b via screws 37, 37a. In order to ensure the displacement of the measuring housing, this is provided with a slide 38 which rests on the rail 11 (see also FIG. 1) and is provided with numerous lubrication channels 39 and 40 for simplified sliding movement.
  • the pin 43 In the zero position, in which no compressive force or no significant compressive force is exerted on the mandrel rod or all forces act in the plastic or elastic range, the pin 43 is assigned to the surface 45 at such a distance that a neutral position is present, ie the movement sequences for Pipe bending can be done.
  • the aforementioned bolt 42 is provided with a spacer ring 46 and carries a support roller 47, which is shown in particular in FIG. 5.
  • This support roller has two opposing surfaces 48 and 49, to which pistons 50 and 51 are assigned, the head surfaces 50a and 51a of which have an enlarged diameter.
  • the associated cylinder spaces 52 and 53 are stepped. This expansion of the diameter of the piston heads and the cylinder space causes the pistons to not be displaceable by a predetermined amount in the direction of the support roller 47, so that a gap to be maintained exactly between the head ends 48 and 49 of the support roller with the associated opposite head ends of the pistons 50 and 51 is preserved.
  • the cylinder spaces 52 and 53 are closed off from the outside by screwed-on covers 54 and 55. They have threaded ports 55 and 56 to allow connection to an oil pressure source.
  • the cylinder chambers are also provided with a set oil pressure. If a torsional force of such a strength is exerted on the bending mandrel or via this on the mandrel rod, for example when rotating the tube by clamping the mandrel on the inner wall of the tube, that a predetermined dimension is exceeded, then either depends on the direction of rotation Head surface 48 on the piston 50 or the head surface 49 on the piston 51. If the out exerted force overcomes the set back pressure, then the pin 43 is moved in the circumferential direction.
  • a movement by a small amount does not give any change, as can be seen from FIG. 4. From this it can be seen that the surface 45 has a certain length in the radial plane, which can also be changed by exchanging it for a differently dimensioned limit switch.
  • the contactless limit switch has tapered edge surfaces 57 and 58. As soon as the pin 33 leaves the region of the surface 45 due to the rotation of the piston 33 about its longitudinal axis, this likewise results in the triggering of a signal. In conjunction with measures stored in the control, this signal then leads to avoid further overloading of the mandrel bar.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP83106995A 1982-10-15 1983-07-16 Machine à cintrer avec mandrin Expired EP0106030B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3238264 1982-10-15
DE19823238264 DE3238264A1 (de) 1982-10-15 1982-10-15 Rohrbiegemaschine mit biegedorn

Publications (2)

Publication Number Publication Date
EP0106030A1 true EP0106030A1 (fr) 1984-04-25
EP0106030B1 EP0106030B1 (fr) 1986-12-30

Family

ID=6175807

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106995A Expired EP0106030B1 (fr) 1982-10-15 1983-07-16 Machine à cintrer avec mandrin

Country Status (4)

Country Link
US (1) US4538436A (fr)
EP (1) EP0106030B1 (fr)
CA (1) CA1202871A (fr)
DE (2) DE3238264A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2737674A1 (fr) * 1995-08-08 1997-02-14 Eaton Leonard Sa Machine a cintrer les tubes avec dispositif de poussee
WO2011029594A3 (fr) * 2009-09-09 2011-07-14 Mewag Maschinenfabrik Ag Machine de pliage pour plier des pièces allongées notamment des tubes ou des profilés
DE102012009845A1 (de) 2012-05-16 2013-11-21 Zambelli Fertigungs Gmbh & Co. Kg Rohrstück aus Metallblech und Verfahren zu dessen Herstellung, Streck-Biegevorrichtung zur Herstellung eines Rohrbogens und Verfahren zur Herstellung eines Rohrbogens
EP2667073A1 (fr) 2012-05-21 2013-11-27 Zambelli Fertigungs GmbH & Co. KG Pièce de tuyau à base de tôles de métal et son procédé de fabrication, dispositif de traction et flexion pour fabrication d'un coude de tube et procédé de fabrication d'un coude de tube

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526811C1 (de) * 1985-07-26 1987-03-26 Roland Man Druckmasch Vorrichtung zum Biegen und Verwinden eines einen Laengsschlitz aufweisenden Rohrs
DE3719033C2 (de) * 1987-06-06 1995-09-14 Schwarze Rigobert Rohrbiegemaschine mit Biegedorn
AT390215B (de) * 1988-09-09 1990-04-10 Vaillant Gmbh Vorrichtung zum biegen von rohren
US5214950A (en) * 1989-07-05 1993-06-01 Grand Prix Silencers Bv Method and apparatus for bending a multiple tube
US5632176A (en) * 1995-10-06 1997-05-27 Pines Manufacturing Programmable pressure controlled mandrel extractor for tube bending machine
DE29600113U1 (de) * 1996-01-04 1996-02-22 Schwarze, Rigobert, Dipl.-Ing., 51109 Köln Rohrbiegemaschine mit Biegedorn
ITRM20070483A1 (it) * 2007-09-17 2009-03-18 Cml Int Spa Macchina curvatubi con anima avente una struttura portante particolarmente resistente alle sollecitazioni di loavorazione
USD821473S1 (en) * 2017-01-14 2018-06-26 The VOID, LCC Suiting station
US9937545B1 (en) 2017-05-16 2018-04-10 Kooima Company Mandrel support device for tube bending machine
CN108941288A (zh) * 2017-05-18 2018-12-07 张家港市伯勤机械厂 一种自动上下料弯管机
CN107755564A (zh) * 2017-11-07 2018-03-06 张家港百舸光电科技有限公司 一种弯管机自动移栽装置
CN213856495U (zh) * 2020-10-26 2021-08-03 璋全五金制品(昆山)有限公司 一种高强度钢管弯管模具芯棒

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2709201A1 (de) * 1976-06-03 1977-12-15 Homer L Eaton Verfahren und maschine zum kaltbiegen von insbesondere metallrohren
US4161110A (en) * 1977-04-28 1979-07-17 EVG Entwicklungs- und Verwertungs-Gesellschaft mbH. Automatic control device for a bending machine
DE3000873A1 (de) * 1979-01-12 1980-07-24 Eaton Leonard Corp Schlitten mit doppelmotorantrieb
DE3106416A1 (de) * 1980-02-22 1981-12-24 Hitachi, Ltd., Tokyo Rohrbiegevorrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2108746A (en) * 1934-03-24 1938-02-15 Erichsen Abraham Martinius Safety device for machine parts subject to high pressures
US2887914A (en) * 1956-10-19 1959-05-26 Mannesmann Meer Ag Mandrel-protecting device for coldpilger rolling mills
DE1950413A1 (de) * 1969-10-07 1971-04-15 Behr Thomson Dehnstoffregler Verfahren und Vorrichtung zur Sicherung von Werkzeugmaschinen
GB1308641A (en) * 1970-01-27 1973-02-21 Shoreham Precision Tools Ltd Presses
DE2732046A1 (de) * 1976-08-20 1979-02-01 Schwarze Rigobert Verfahren zum biegen zweier ineinander gesteckter rohre und vorrichtung zur durchfuehrung des verfahrens
GB1597121A (en) * 1978-01-16 1981-09-03 Secretary Industry Brit Fluidic device for measuring or applying a load
DE2832980C2 (de) * 1978-07-27 1984-11-08 Rigobert Dipl.-Ing. 5000 Köln Schwarze Beschickungsvorrichtung für eine Rohrbiegemaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2709201A1 (de) * 1976-06-03 1977-12-15 Homer L Eaton Verfahren und maschine zum kaltbiegen von insbesondere metallrohren
US4161110A (en) * 1977-04-28 1979-07-17 EVG Entwicklungs- und Verwertungs-Gesellschaft mbH. Automatic control device for a bending machine
DE3000873A1 (de) * 1979-01-12 1980-07-24 Eaton Leonard Corp Schlitten mit doppelmotorantrieb
DE3106416A1 (de) * 1980-02-22 1981-12-24 Hitachi, Ltd., Tokyo Rohrbiegevorrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2737674A1 (fr) * 1995-08-08 1997-02-14 Eaton Leonard Sa Machine a cintrer les tubes avec dispositif de poussee
WO2011029594A3 (fr) * 2009-09-09 2011-07-14 Mewag Maschinenfabrik Ag Machine de pliage pour plier des pièces allongées notamment des tubes ou des profilés
DE102012009845A1 (de) 2012-05-16 2013-11-21 Zambelli Fertigungs Gmbh & Co. Kg Rohrstück aus Metallblech und Verfahren zu dessen Herstellung, Streck-Biegevorrichtung zur Herstellung eines Rohrbogens und Verfahren zur Herstellung eines Rohrbogens
EP2667073A1 (fr) 2012-05-21 2013-11-27 Zambelli Fertigungs GmbH & Co. KG Pièce de tuyau à base de tôles de métal et son procédé de fabrication, dispositif de traction et flexion pour fabrication d'un coude de tube et procédé de fabrication d'un coude de tube

Also Published As

Publication number Publication date
DE3238264C2 (fr) 1990-09-06
DE3368537D1 (en) 1987-02-05
DE3238264A1 (de) 1984-04-19
US4538436A (en) 1985-09-03
EP0106030B1 (fr) 1986-12-30
CA1202871A (fr) 1986-04-08

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