EP0106030B1 - Machine à cintrer avec mandrin - Google Patents

Machine à cintrer avec mandrin Download PDF

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Publication number
EP0106030B1
EP0106030B1 EP83106995A EP83106995A EP0106030B1 EP 0106030 B1 EP0106030 B1 EP 0106030B1 EP 83106995 A EP83106995 A EP 83106995A EP 83106995 A EP83106995 A EP 83106995A EP 0106030 B1 EP0106030 B1 EP 0106030B1
Authority
EP
European Patent Office
Prior art keywords
mandrel
piston
rod
bending
mandrel rod
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
Application number
EP83106995A
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German (de)
English (en)
Other versions
EP0106030A1 (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
Application granted granted Critical
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 according to the preamble of claim 1.
  • the invention is based on a prior art as it results from DE-A1-3106416.
  • deformations of the mandrel bar are measured in the axial direction and used to control the pipe bending machine.
  • 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 pipes, such as the z. B. described in DE-A-27 32 046 of 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.
  • 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 FIG Way that after the bending the retraction or before the bending pushing the mandrel over the mandrel bar is difficult or not feasible at all.
  • Damage to the mandrel or the mandrel rod or consequential damage to other parts of the tube bending machine, for example the mandrel retraction or the like, is particularly serious in tube bending machines which operate 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-A-28 32 980 of the applicant.
  • tube bending machines which operate 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-A-28 32 980 of the applicant.
  • even slight deformations of the bending mandrel or its mandrel rod that go beyond a certain tolerance act to severely impede 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.
  • 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 multiple types, depending on the stress caused by excessive stress on the mandrel or the mandrel rod carrying it. If, for example, the mandrel or the mandrel rod is overstressed by pushing the pipe to be bent over the mandrel, the pushing is stopped with the effect that the overstressing stops immediately. Then the pipe which is not suitable for bending is automatically removed from the bending machine by the device which has introduced it into the bending machine or is prepared by machine so that it can be removed from the bending machine by hand.
  • the signals resulting from 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 measures which are provided or necessary, depending on the respective cause, are carried out, in addition to avoiding damage to the mandrel rod, other consequential damage can also be avoided.
  • the solution that the rear end of the mandrel rod is mounted on a housing which is provided with a hydraulic piston-cylinder arrangement for measuring the force exerted on the mandrel rod thus includes the two measures that the housing of the measuring device also carries the mandrel rod and the overstress originating 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, has the advantage that a first damping can take place through the hydraulic fluid arranged in the cylinder in connection with corresponding valves, so that the piston in the piston -Cylinder arrangement overstressing the mandrel rod also acts and can act as a shock absorber, so that if too much axial pressure is exerted by a tube pushed over when pushed onto the mandrel rod, this becomes elastic due to the yielding of the mandrel rod or the piston in the cylinder space can be caught.
  • the pressure which can be set in the cylinder space can also be used to measure the force which corresponds to a deformation in the elastic or plastic region which is harmless for the mandrel rod.
  • 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 protrudes 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 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 on 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.
  • 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 back and forth in the axial direction of the pipe to be bent. is.
  • 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 pipe 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 pipe to be bent, so that it can be adapted to the bending radius the template 16 is present.
  • Figures 3 to 5 show a particularly advantageous device for determining and evaluating an overuse of the mandrel or the mandrel rod.
  • 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 space 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 a distance such that a neutral position is present, i. H. the movements for pipe bending are carried out.
  • the piston 33c overcomes the counterforce built up by the oil pressure in the cylinder space 34 the result that the piston 33 is pushed into the cylinder space 34 by such an amount, i. H.
  • This signal entered for example in the control, then triggers any measures that eliminate the axial overload on the mandrel bar.
  • the aforementioned bolt 42 is provided with a spacer ring 46 and carries a support roller 47, which emerges in particular from FIG. 5.
  • This support roller has two opposite 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 enlargement of the diameter of the piston heads and the cylinder space means that the pistons cannot be displaced 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 spaces 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 turning the tube by clamping the mandrel on the inner wall of the tube, that a predetermined amount exceeds, 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 force exerted overcomes the set counter pressure, 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.
  • the surface 45 has a certain length in the radial plane, which can also be changed by replacing it with a differently dimensioned limit switch.
  • the contactless limit switch has beveled edge surfaces 57 and 58. As soon as the pin 43 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)

Claims (11)

1. Machine à couder les tubes avec un chariot comportant une douille de serrage, un gabarit de cintrage avec des mâchoires de serrage ainsi qu'une glissière contiguë et un mandrin de cintrage disposé dans le tube à couder à proximité du gabarit de cintrage, le mandrin étant fixé sur l'extrémité de tête d'une tige de mandrin, l'extrémité arrière de la tige de mandrin étant munie d'un instrument de mesure (33, 34) qui détecte les sollicitations axiales de la tige de mandrin et commande le déplacement de la machine à couder les tubes, caractérisée en ce que l'instrument de mesure (33, 34) détecte en plus les sollicitations de rotation ou de torsion de la tige de mandrin (25) et que l'extrémité arrière de la tige de mandrin est munie d'une rétraction de mandrin ayant la forme d'un dispositif hydraulique piston- cylindre (28, 29), l'instrument de mesure étant constitué d'un boîtier de mesure (26) avec un dispositif hydraulique piston et cylindre (33, 34).
2. Dispositif selon la revendication 1, caractérisé en ce que le moyen d'ajustement pour la modification de la pression est disposé dans la chambre de cylindre (34).
3. Dispositif selon les revendications 1 ou 2, caractérisé en ce que le piston (33) est constitué par un tronçon partiel avant (33a), qui dépasse du boîtier de mesure (26) et qui est relié à la tige de mandrin (25) et par un tronçon partiel arrière (33c) qui pénètre dans la chambre de cylindre (34) raccordée à la source de pression, et que sur le piston (33) se trouve un détecteur (43) qui coopère avec un commutateur (44) monté sur le boîtier de mesure (26).
4. Dispositif selon la revendication 3, caractérisé en ce que le détecteur (43) s'écarte en direction radiale sur le piston (33) et coopère avec un interrupteur de fin de course (44), de préférence un interrupteur de fin de course sans contact.
5. Dispositif selon la revendication 2, caractérisé en ce que, dans la zone centrale (33b) du piston (33), se trouve un élément supplémentaire s'écartant essentiellement en direction radiale (42, 46, 47) auquel sont coordonnés les pistons (50, 51) s'étendant dans le plan radial sur deux faces opposées avec les cylindres (52, 53).
6. Dispositif selon la revendication 4, caractérisé en ce que la chambre de cylindre (34 et 52, 53) est munie d'une conduite d'huile pour une pression ajustable.
7. Dispositif selon la revendication 5, caractérisé en ce que les pistons (51, 52) sont conçus avec un diamètre agrandi à leurs extrémités tournées vers les chambres de cylindre (52, 53) et que les chambres de cylindre présentent deux différents diamètres, avec un gradin correspondant.
8. Dispositif selon la revendication 1 ou l'une quelconque des revendications 2 à 6, caractérisé en ce que, pour le déplacement axial et pour le déplacement rotatif, le piston 33 est coordonné à une tige unique (43), qui coopère avec un interrupteur de fin de course sans contact (44).
9. Dispositif selon la revendication 7, caractérisé en ce que l'interrupteur de fin de course sans contact (44) présente une face (45) s'étendant dans le plan radial du piston (33) et des faces (57 et 58) faisant suite à la précédente, dans un sens oblique par rapport à celle-ci, comme une arête interrompue.
10. Dispositif selon la revendication 1 caractérisé en ce que le boîtier de mesure (26) est muni, sur son côté opposé à la tige de mandrin (25), d'une fixation (26c) pour la tige de piston (28) de retrait hydraulique du mandrin (28, 29).
11. Dispositif selon la revendication 1 et une ou plusieurs des revendications 3 à 10, caractérisé en ce que le boîtier de mesure (26) est constitué par trois parties de boîtier (26a, 26b, 26c) divisées dans un plan radial, reliées par des vis (27), la première partie de boîtier recevant le piston (33) avec la tige de mesure (43), la deuxième partie de boîtier recevant la chambre de cylindre (34) et la troisième partie de boîtier recevant la tige de piston (28) du dispositif de retrait du mandrin (28, 29).
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
DE19823238264 DE3238264A1 (de) 1982-10-15 1982-10-15 Rohrbiegemaschine mit biegedorn
DE3238264 1982-10-15

Publications (2)

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

Families Citing this family (16)

* 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
FR2737674B1 (fr) * 1995-08-08 1997-12-05 Eaton Leonard Sa Machine a cintrer les tubes avec dispositif de poussee
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
CH701801A2 (de) * 2009-09-09 2011-03-15 Mewag Maschinenfabrik Ag Biegemaschine zum Biegen von länglichen Werkstücken, insbesondere von Rohren bzw. Profilen.
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
EP2667073B1 (fr) 2012-05-21 2017-11-08 Zambelli Fertigungs GmbH & Co. KG Pièce de tuyau à base de tôles de métal, son procédé de fabrication et procédé de fabrication d'un coude de tube
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

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US2887914A (en) * 1956-10-19 1959-05-26 Mannesmann Meer Ag Mandrel-protecting device for coldpilger rolling mills
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GB1308641A (en) * 1970-01-27 1973-02-21 Shoreham Precision Tools Ltd Presses
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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
US4206620A (en) * 1979-01-12 1980-06-10 Eaton-Leonard Corporation Dual motor carriage drive
JPS56119626A (en) * 1980-02-22 1981-09-19 Hitachi Ltd Pipe bending machine

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Publication number Priority date Publication date Assignee Title
DE2732046A1 (de) * 1976-08-20 1979-02-01 Schwarze Rigobert Verfahren zum biegen zweier ineinander gesteckter rohre und vorrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
DE3238264A1 (de) 1984-04-19
DE3368537D1 (en) 1987-02-05
EP0106030A1 (fr) 1984-04-25
US4538436A (en) 1985-09-03
CA1202871A (fr) 1986-04-08
DE3238264C2 (fr) 1990-09-06

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