US3724258A - Apparatus for bending elongate objects - Google Patents

Apparatus for bending elongate objects Download PDF

Info

Publication number
US3724258A
US3724258A US00121513A US3724258DA US3724258A US 3724258 A US3724258 A US 3724258A US 00121513 A US00121513 A US 00121513A US 3724258D A US3724258D A US 3724258DA US 3724258 A US3724258 A US 3724258A
Authority
US
United States
Prior art keywords
bending
base frame
guide
bending arm
heating
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
US00121513A
Other languages
English (en)
Inventor
M Hofstede
H Logman
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.)
Cojafex BV
Original Assignee
Cojafex BV
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
Priority claimed from NL707003580A external-priority patent/NL142607B/xx
Priority claimed from NL7100269A external-priority patent/NL153787B/xx
Application filed by Cojafex BV filed Critical Cojafex BV
Application granted granted Critical
Publication of US3724258A publication Critical patent/US3724258A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

  • Bending takes place in the narrow heated zone, and as in this zone the bending moment is consequential to the force exerted on the tube in longitudinal direction thereof, stretching at the outer side of the bend is decreased and upsetting at the inner side of the bend is increased, so that at the outer side of the bend the wall thickness is reduced to a lower extent than when no such longitudinal force should be exerted on the tube.
  • this object is reached by having the center of rotation of the bending arm and the guide means for the tube or the like arranged in the apparatus in such a manner that the said center and the heated zone of the tube have a certain freedom to move in relation to each other so as to change their distance to a certain amount, the said center remaining thereby substantially in the plane through the narrow heated zone.
  • This may be accomplished by having the center of rotation of the bending arm mounted in the machine not in a fixed manner, but in such a way that during a bending operation this center may move in a direction perpendicular or substantially perpendicular to the center line of the unbent portion of the tube or the like, the guide means for such unbent portion guiding this portion in a fixed track with regard to the base of the machine.
  • Another way of accomplishing the same result consists in having the center of rotation of the bending arm mounted in the machine base mounted in a fixed manner but mounting the guide means for the unbend portion of the tube or the like in such a way that the zone where heating is effected may move towards to or away from the center of rotation of the bending arm.
  • the plane of the narrow zone of heating should remain substantially passing through the center of the bending arm, notwithstanding movements of the tube or the like.
  • the desired mobility of either the center of rotation of the bending arm or of the heated zone of the elongated member may be accomplished in a number of ways. So in the case of a mobile bending arm center, the bending arm may for example be connected at its center of rotation pivotally to a rocking arm or coupling rod extending substantially parallel to the unbent portion of the elongate member, or to a slide movable substantially perpendicularly to the unbent portion of the elongate member.
  • resilient means may be provided to counteract to a certain extent the displacement of the bending arms center of rotation or the guiding means for the tube or other elongate object or member.
  • Such resilient means may be formed by springs or rubber blocks.
  • FIG. 1 shows a top view of a first example of a bending machine according to the invention.
  • FIG. 2 shows a detail thereof in modified form.
  • FIGS. 3 6 show in a very diagrammatic way how the principle on which the invention is based can be applied to bending machines, having a fixed center of rotation of the bending arm.
  • FIG. 7 shows a top view of an example of a bending machine according to the invention, constructed along the lines indicated in FIG. 6.
  • FIG. 1 shows a tube bending machine with a bending arm, the center of rotation which is movable.
  • the tube 1 to be bent is located in the machine, the base frame of which is indicated by the reference numeral 2, and is guided during its forward movement, caused by a force acting thereon in the direction of the arrow 3 (by means not shown in the drawing), by rollers 4 and 5, connected to the frame 2 and further guided by guiding means 6.
  • This latter means can comprise a collar piece, fixed to the tube and having rollers 7 running along guide faces 8 of the frame 2.
  • the forward end of the tube is fixed to the bending arm 10 in a rotation free manner, e.g. by means of a clamping device 9.
  • the bending arm is rotatably connected to a rocking arm or coupling rod 12 by means of a journal at 11, the rocking arm itself being pivotally connected to the frame 2 by means of a journal 13.
  • the tube is encircled by a heating device 14, adapted to heat at this place a narrow zone of the tube to a temperature required for the bending of the tube.
  • a heating device 14 adapted to heat at this place a narrow zone of the tube to a temperature required for the bending of the tube.
  • the heating device 14 is preferably of the electric inductor type but may be of different construction, e.g. adapted for heating by gas. Essential however is that only a narrow zone of the tube will be heated thereby.
  • the tube With operative heating by 14 the tube is moved forward in the direction of the arrow 3, the force required for said movement being supplied e.g. by a motor driven screw spindle or a hydraulic cylinder. That end of the tube which is fixed at 9 to the bending arm can only move about the center of rotation l 1 of the bending arm 10, which causes at the place heated by 14 a bending with a radius equal to the distance between the center 11 and the center-line of the unbent portion of the tube. In order to prevent deformation in that part of the tube which just passed the heating device 14 the tube, particularly when it is a thin-walled tube, will if necessary be cooled directly beyond the heated zone, e.g. by spraying water thereon.
  • this phenomenon is made use of to effect of correction according to the invention now consists in measuring in an arbitrary way the displacement of the center of rotation 11; and shifting in dependence on the measured value the heating device until the center 11 again takes up its original position.
  • a sensing device responsive to a displacement of the said center of rotation may e.g. give a signal, that via a transmission (electric, pneumatic, etc.) causes a mechanism for shifting the heating device to operate.
  • FIG. 1 The machine diagrammatically shown in FIG. 1 is arranged for adaptation to different tube diameters and radius of bending by adjustment or exchange of the rollers 4,5 of the guide shoe 6, of the fixing member 9 and by change of the effective length of the bending arm 10.
  • An example of means to attain the latter is shown in FIG. 1 by the guide slots 15 and 16, in which slots the center of rotation 13 of the rocking arm 12 and the fixing member 9 can be set tight.
  • the machine can be arranged for bending tubes or other elongate objects in a helical shape by displacing during the bending process the center of rotation 13 gradually in a direction perpendicular to the plane of drawing in FIG. 1.
  • the movability of the center of rotation 11 can, as has already been said, be attained in other ways than by means of the rocking arm 12, e.g. by means of a slide movable along guides, by means of a straight motion mechanism, or as indicated in FIG. 2, by means of two or another member of flexible strips or blade springs 17.
  • Prevention of a permanent transverse force on the center'of rotation of the bending arm can, when a slide is provided'to which the arm is pivotally connected, also be attained by adjusting the position of the slide by means of a mechanism controlled by such a temporarily occuring force until said force will be annihilated or nearly so.
  • the force concerned may be determined at the center of rotation itself but also at roller 5.
  • FIGS. 3,4,5 and 6 is shown'in a very diagrammatic way how the principle on which the invention is based can be applied in bending machines in which (for a given bending radius) the center of rotation of the bending arm has a fixed position with regard to the base of the bending machine.
  • the reference numeral 101 indicates the stationary center of rotation of the bending arm 102, which at 108 is in a rotation free manner connected to tube 3 (or other elongate object) to be bent, e.g. by means of a clamping member.
  • the distance 101 108 is of course equal to the radius over which the object is to be bent; in these figures bending has taken place already over some length of the object. De facto the bending arm 102 and the bent portion of the tube constitute a rigid assembly,
  • the tube 103 (by which denomination any elongate object to be bent shall be indicated hereinafter) is guided over its unbent portion in a guide frame or support 104, with interposed guide rollers 106 and 107, transmitting transverse forces from the tube to the guide frame.
  • a longitudinal force is applied to the tube by means of a power device operating on the tube on one hand and on the guide frame on the other hand.
  • the power device is symbolically sketched as a spring 105, but in practice it may consist of a hydraulic or pneumatic cylinder, a motor driven screwspindle or screw rack or the like.
  • the tube is locally heated in the plane, indicated by a dotted line, passing or nearly passing through the center of rotation 101 of the bending arm. Driven forward by the longitudinally acting force the tube is bent over the radius r in the heated zone which gradually is displaced along the tube.
  • the guide frame 104 in order to attain the movability as mentioned above, is provided at its forward end with sideways extending guide rails or bars 110, adapted to move slidingly between guide rollers 111 with stationary axis.
  • the guide frame may bear rollers adapted to move between stationary rails, or guiding surfaces may be applied instead of rollers.
  • FIGS. 4,5 and 6 show in a diagrammatic way arrangements in which a sideways displacement as obtained with the arrangement of FIG. 3 is at least approximated.
  • the guide frame 104 has pivotally connected to it at the points 114, 115 respectively two short coupling rods or tie rods 112 and 113, the other ends of said rods being pivotally connected at 116, respectively 1 17 to stationary points.
  • the rear end of the guide frame is adapted to pivot about the fixed point 118.
  • the guide frame 104 has pivotally connected to it at 120 one tie rod, the other end of which is pivoting about a fixed point 122, whereas the rear end of the guide frame is provided with a slot 124 adapted to slide along a stationary pin or roller 123.
  • FIG. 7 shows more detailed a machine according to the principle of FIG. 6 as seen from above.
  • the numeral 125 indicates in diagrammatic way the base frame on which the various parts are mounted, such as the journal 101 constituting the center of rotation of the bending arm 102, and the pin 123, cooperating with the slot 124 of the guide frame 104.
  • the tube 103 here shown in a position in which bending has not yet been effected, is connected to the bending arm 102 104 the tube 103 is guided by guiderollers 106 of the guide frame, whereas at its rear end the tube is enclosed by a shoe or chuck 126 provided with rollers 7 for guiding the rear end of the tube within the frame 104.
  • the force for moving the tube in forward direction in the guide frame is supplied by a screw spindle 127, threaded in the rear end of the frame 104, and adapted to be rotated by means of e.g. an electromotor (not shown in the drawing).
  • an electromotor not shown in the drawing.
  • a tie rod 121 parallel to the frame is connected thereto by means of the pivot 120; the other end of the rod pivots at 122 about a point fixed with regard to the base frame 125.
  • the connection between the pivot 122 and the base frame 125 is brought about with the aid of both rods 128 and 129, the first adapted to pivot about a point 130 of the base frame, the latter about a point 131 of the base frame.
  • the point 130 is situated about halfway between the points 101 and 123, the point 131 in the neighborhood of point 101.
  • the rod 128 has a fixed length
  • the length of the rod 129 can be altered by means of a turnbuckle 132. The purpose thereof will be described later on.
  • the guide frame 104 supports a device 133 to heating the tube in the narrow zone, indicated by 109, transverse to the longitudinal axis of the unbent tube portion.
  • This device may comprise electrical apparatusfor feeding alternating current to an induction ring, 134 encircling the tube in the said zone.
  • Other heating appliances may be used provided the tube will be heated thereby in a narrow zone only.
  • the heating device may be combined with means for cooling the progressily moving tube in the zone which just had been heated.
  • the plane of the zone 109 and of the heating ring 134 passes or nearly passes through the center of rotation 101 of the bending arm, otherwise stated: the longitudinal axis of the unbent portion of the tube is substantially perpendicular to the line connecting zone by means of a clamping member 108 in a rotation free manner. Adjacent the forward end of the guide frame 109 and the center of rotation of the bending arm. This relation is essential to the proper operation "of the machine and should therefore remain when the radius over which a tube is to be bent is altered.
  • the effective length of the bending arm 102 as well as the position of the guide frame 104 with regard to the base frame is modified.
  • a modification of the length of the bending arm 102 is effected by displacing the clamping block 108 along the arm, the latter being provided with a slot 135, in which the block 108 can be fixed at the place desired.
  • a modification of the position of the guide frame, fitting the first-mentioned modification, is obtained by altering the length of the rod 129; thereby the rod 128 pivots about the center of rotation 30, whereas the slot 124'slides along the pin 123.
  • the location of the points and 123 and the length of the rod 128 are chosen such that with any selected bending radius the right angle between the longitudinal axis of the unbent tube portion and the line connecting 109 and 101 is practically maintained.
  • FIG. 7 can be modified in such a way that the pivot 120 and the slot 124 of the guide frame 104 are located in'the vertical plane through the center line of the unbent tube portion and the guide frame.
  • Another possible modification of the machine of FIG. 7 would be to mount the guide rollers 106 and the heating device 133, 134 not on the guide frame 104, but on a separate auxiliary support, slidably arranged in the guide frame and connected to the base frame 125 by means of rods similar to the rods 121 and 128 of FIG. 7.
  • the guide frame 104 need to be shifted lengthwise upon altering the bending radius, so that the shot-and-pin guiding means 123,124 at the rear end of the guide frame can be replaced by a pivot, such as the pivot 118 in FIG. 3.
  • an additional braking force can be applied to the bending arm; on the other hand it may prove desirable, e.g. with thin-walled tubes and very plastic materials, to apply to the bending arm an additional driving force;
  • an electric or hydraulic motor with driving as well as braking properties can be used.
  • Apparatus for bending elongate objects such as tubes, with a substantially constant bending radius comprising a base frame, guide means connected to said base frame for guiding the object to be bent, means for urging an object when placed within said guide means in a forward direction, heating means provided beyond the forward end of the guide means so as to encircle the object to be bent and adapted to heat such object in a narrow transverse zone thereof, a bending arm, pivotally arranged within the apparatus and having its pivot point situated in or nearly in the plane in which the heating means can effect heating of the elongate object and means for clamping the bending arm to the elongate object beyond the place of heating, said clamping means constituting the only connection between the bending arm and the object to be bent, the pivot point of the bending arm and the guide means for guiding the object to be bent being connected to the base frame in such a way that the said pivot point and the zone of heating of the object to be bent are adapted to move in relation to each other so as to change to a limited amount
  • Apparatus for bending elongate objects such as tubes, with a substantially constant bending radius comprising a base frame, longitudinally extending guide means fixedly connected to said base frame for guiding the object to be bent, means for urging an object when placed within said guide means in a forward direction, heating means provided beyond the forward end of the guide means so as to encircle the object to be bent and adapted to heat such object in a narrow transverse zone thereof, a bending arm, pivotally arranged within the apparatus, and having its pivot point situated in or nearly in the plane in which the heating means can effect heating of the elongate object, and means for clamping the bending arm to the elongate object beyond the place of heating, said clamping means constituting the only connection between the bending arm and the object to be bent, the pivot point of the bending arm being movably connected to the base frame in such a way that the said pivot point is adapted to move to a limited amount in a direction substantially perpendicular to the longitudinal axis of the guide means.
  • Apparatus for bending elongate objects such as tubes, with a substantially constant bending radius comprising a base frame, a longitudinally extending guide frame connected to said base frame for guiding the object to be bent, means for urging an object when placed within said guide frame in a forward direction, heating means provided adjacent the forward end of the guide frame so as to encircle the object to be bent and adapted to heat such object in a narrow transverse zone thereof, a bending arm, pivotally connected to the base frame and having its pivot point situated in or nearly in the plane in which the heating means can effect heating of the elongate object and means for clamping the bending arm to the elongate object beyond the place of heating, said clamping means constituting the only connection between the bending arm and the object to be bent, the guide frame for guiding the object to be bent being connected to the base frame in such a way that its forward end carrying the heating means is adapted to move to a limited amount towards to and away from the pivot point of the bending arm.
  • Apparatus according to claim 2 in which the bending arm is pivotally connected to a slide member adapted to slide along guide means in a direction perpendicular to the guide means for the unbent portion of the object to be bent.
  • Apparatus according to claim 3 in which and the forward end of the guide frame is provided with a straight motion mechanism allowing movement in a transverse direction 9. Apparatus according to claim 3 in which the forward end of the guide frame is connected to, the base frame by means of one or more coupling rods, each of said rods having one end pivotally connected to the base frame of the apparatus and the other end pivotally connected to the said end of the guide frame.
  • Apparatus according to claim 3 in which the effective length of the bending arm is adjustable and the position of the guide frame for the unbent portion of the elongate object with regard to the base frame is also adjustable to meet the adjustment of the bending arm length.
  • Apparatus according to claim 11 in which the pivot of the coupling rod for connecting it to the base frame, is arranged at the end of a second rod, the other end of which is pivotally connected to a point of the base frame situated about half way between the pivot point of the bending arm and the point where the rear end of the guide frame is connected to the base frame.
  • Apparatus according to claim 11 in which the pivot of the coupling rod for connecting it to the base frame, is arranged at the end of a second rod, the other end in which is pivotally connected to a point of the base frame situated about half way between the pivot point of the bending arm and the point where the rear end of the guide frame is connected to the base frame and in which a third rod of adjustable length is pivotally connected at one end to the end of the second rod near to its pivot with the coupling rod and at the other end with a point of the base frame near the pivot point of the bending arm.
  • Method of correcting deviations in the desired bending radius of a progressively forward driven elongate object comprising heating the object in a narrow ransverse zone by moving the ObJCCl'. through a heating means which encircles the object, clamping the object to a rotatable bending arm, determining during bending small deviation of the nominal distance between the center of rotation of said bending arm and the heating means, and slightly shifting the heating means in the longitudinal direction of the unbent part of the object in one or the other sense in dependence on such deviations.
  • Apparatus for carrying out the method of claim 14, comprising mechanical, electrical or optical sensing means for detecting a small displacement of the displaceable center of rotation of the bending arm with regard to the heating means and means for operationally connecting such sensing means to means for shifting the heating means along the elongate object.
  • Apparatus for carrying out the method of claim 14 comprising mechanical, electrical or optical sensing means for detecting a displacement of the displaceable guide means for the elongate object, which guide means carry the heating means, and means for operationally connecting such sensing means to means for shifting the heating means along the elongate object.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US00121513A 1970-03-12 1971-03-05 Apparatus for bending elongate objects Expired - Lifetime US3724258A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL707003580A NL142607B (nl) 1970-03-12 1970-03-12 Werkwijze en inrichting voor het continu voortschrijdend buigen van langgerekte voorwerpen, en met de werkwijze verkregen gebogen voorwerpen.
NL7100269A NL153787B (nl) 1971-01-08 1971-01-08 Werkwijze en inrichting voor het continu voortschrijdend buigen van langgerekte voorwerpen.

Publications (1)

Publication Number Publication Date
US3724258A true US3724258A (en) 1973-04-03

Family

ID=26644525

Family Applications (1)

Application Number Title Priority Date Filing Date
US00121513A Expired - Lifetime US3724258A (en) 1970-03-12 1971-03-05 Apparatus for bending elongate objects

Country Status (9)

Country Link
US (1) US3724258A (fr)
BE (1) BE764100A (fr)
CA (1) CA953627A (fr)
CH (1) CH534552A (fr)
CS (1) CS201025B2 (fr)
DE (1) DE2112019C3 (fr)
DK (1) DK144554C (fr)
FR (1) FR2081883B1 (fr)
SE (1) SE381583B (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813914A (en) * 1973-01-24 1974-06-04 Greenlee Bros & Co Bending apparatus
US3835687A (en) * 1972-09-13 1974-09-17 Mitsubishi Heavy Ind Ltd Device for detecting a bend angle upon precisely bending a metallic pipe
US3878720A (en) * 1971-12-27 1975-04-22 Tools For Bending Inc Tube shaping apparatus for radius-bending, end-flaring and the like
US3924438A (en) * 1974-09-23 1975-12-09 Greenlee Bros & Co Hydraulic cable bender
US4022045A (en) * 1975-03-24 1977-05-10 Mannesmannrohen-Werke Ag Tube bending apparatus
DE2559694A1 (de) * 1974-07-23 1977-07-21 Daiichi Koshuha Kogyo Kk Verfahren und vorrichtung zum biegen von metallrohren unter verwendung eines verschiebbaren spannfutters
DE2532735C3 (de) 1974-07-23 1978-08-03 Daiichi Koshuha Kogyo K.K., Tokio Vorrichtung zum Warmbiegen von Metallrohren
USRE30639E (en) * 1976-09-03 1981-06-09 Cojafex B.V. Process and device for bending elongated articles
US4412442A (en) * 1979-09-21 1983-11-01 Dai-Ichi High Frequency Co., Ltd. Method for bending a metal pipe
US4414833A (en) * 1980-08-05 1983-11-15 Societe Anonyme Dite: Stein Industrie Method and apparatus for bending a long metal member
US4596128A (en) * 1984-07-26 1986-06-24 Cojafex Bv Method and apparatus for bending elongate workpieces, particularly pipes
US20100300169A1 (en) * 2007-05-08 2010-12-02 Aws Schaefer Technologie Gmbh Device and method for bending pipes
CN104874691A (zh) * 2015-05-07 2015-09-02 浙江利帆家具有限公司 一种弯管机的夹紧装置
RU2634815C1 (ru) * 2016-12-28 2017-11-03 Федеральное Государственное Унитарное Предприятие "Научно-Производственное Объединение "Техномаш" Способ изготовления волноводов сложной формы и устройство для осуществления способа
CN109483861A (zh) * 2018-12-29 2019-03-19 中山市德马汽车零部件有限公司 光导折弯设备和使用方法及具有其的汽车零配件生产线

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2546695C3 (de) * 1975-10-17 1987-04-16 Daiichi Koshuha Kogyo K.K., Tokio/Tokyo Vorrichtung zum kontinuierlichen Biegen von langgestreckten Werkstücken
DE2744420C2 (de) * 1977-10-03 1983-10-20 Ludwig 6120 Michelstadt Lang Maschine zum Biegen von Strangmaterial
DE3151236C2 (de) * 1981-12-22 1986-06-26 Mannesmann AG, 4000 Düsseldorf Vorrichtung zum kontinuierlich-fortschreitenden Biegen von Rohren
DE10246977B4 (de) * 2002-10-09 2007-06-28 Thyssenkrupp Steel Ag Vorrichtung zum 3D-Freiformbiegen von Profilen
RU2478014C1 (ru) * 2011-09-15 2013-03-27 Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (Минпромторг РФ) Способ изготовления спиралевидного многогранного змеевика теплообменника из толстостенных жаропрочных труб
CN113458281B (zh) * 2021-07-06 2023-01-13 深圳市豪锐科技有限公司 一种半导体集成加工用成型机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US785083A (en) * 1904-12-16 1905-03-21 Whitlock Coil Pipe Company Apparatus for bending pipe.
US799670A (en) * 1904-02-12 1905-09-19 Crane Co Tube-bending machine.
US1105914A (en) * 1909-09-03 1914-08-04 James Acton Miller Apparatus for bending pipes, rods, &c.
US2286893A (en) * 1937-08-23 1942-06-16 Pont A Mousson Fond Apparatus and method for bending pipes, bars, plates, and like pieces
US2812004A (en) * 1955-05-27 1957-11-05 Combustion Eng Separate yieldable pressure means on slide of pivoted type of pipe bender
US3287952A (en) * 1963-04-06 1966-11-29 Hilgers Maschinen Und Appbau A Bending machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US799670A (en) * 1904-02-12 1905-09-19 Crane Co Tube-bending machine.
US785083A (en) * 1904-12-16 1905-03-21 Whitlock Coil Pipe Company Apparatus for bending pipe.
US1105914A (en) * 1909-09-03 1914-08-04 James Acton Miller Apparatus for bending pipes, rods, &c.
US2286893A (en) * 1937-08-23 1942-06-16 Pont A Mousson Fond Apparatus and method for bending pipes, bars, plates, and like pieces
US2812004A (en) * 1955-05-27 1957-11-05 Combustion Eng Separate yieldable pressure means on slide of pivoted type of pipe bender
US3287952A (en) * 1963-04-06 1966-11-29 Hilgers Maschinen Und Appbau A Bending machine

Cited By (18)

* 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
US3835687A (en) * 1972-09-13 1974-09-17 Mitsubishi Heavy Ind Ltd Device for detecting a bend angle upon precisely bending a metallic pipe
US3813914A (en) * 1973-01-24 1974-06-04 Greenlee Bros & Co Bending apparatus
DE2559694A1 (de) * 1974-07-23 1977-07-21 Daiichi Koshuha Kogyo Kk Verfahren und vorrichtung zum biegen von metallrohren unter verwendung eines verschiebbaren spannfutters
DE2532735C3 (de) 1974-07-23 1978-08-03 Daiichi Koshuha Kogyo K.K., Tokio Vorrichtung zum Warmbiegen von Metallrohren
US3924438A (en) * 1974-09-23 1975-12-09 Greenlee Bros & Co Hydraulic cable bender
US4022045A (en) * 1975-03-24 1977-05-10 Mannesmannrohen-Werke Ag Tube bending apparatus
USRE30639E (en) * 1976-09-03 1981-06-09 Cojafex B.V. Process and device for bending elongated articles
US4412442A (en) * 1979-09-21 1983-11-01 Dai-Ichi High Frequency Co., Ltd. Method for bending a metal pipe
EP0025929B1 (fr) * 1979-09-21 1984-05-30 Dai-Ichi High Frequency Co., Ltd Procédé pour cintrer un tube métallique
US4414833A (en) * 1980-08-05 1983-11-15 Societe Anonyme Dite: Stein Industrie Method and apparatus for bending a long metal member
US4596128A (en) * 1984-07-26 1986-06-24 Cojafex Bv Method and apparatus for bending elongate workpieces, particularly pipes
US20100300169A1 (en) * 2007-05-08 2010-12-02 Aws Schaefer Technologie Gmbh Device and method for bending pipes
CN101678426B (zh) * 2007-05-08 2011-12-28 Aws舍费尔技术有限公司 用于使管道弯曲的装置及方法
CN104874691A (zh) * 2015-05-07 2015-09-02 浙江利帆家具有限公司 一种弯管机的夹紧装置
RU2634815C1 (ru) * 2016-12-28 2017-11-03 Федеральное Государственное Унитарное Предприятие "Научно-Производственное Объединение "Техномаш" Способ изготовления волноводов сложной формы и устройство для осуществления способа
CN109483861A (zh) * 2018-12-29 2019-03-19 中山市德马汽车零部件有限公司 光导折弯设备和使用方法及具有其的汽车零配件生产线
CN109483861B (zh) * 2018-12-29 2023-08-18 中山市德马汽车零部件有限公司 光导折弯设备和使用方法及具有其的汽车零配件生产线

Also Published As

Publication number Publication date
BE764100A (fr) 1971-08-02
DK144554B (da) 1982-03-29
DE2112019B2 (de) 1974-06-20
CS201025B2 (en) 1980-10-31
SE381583B (sv) 1975-12-15
DK144554C (da) 1982-09-20
CH534552A (fr) 1973-03-15
DE2112019C3 (de) 1975-02-06
FR2081883A1 (fr) 1971-12-10
CA953627A (en) 1974-08-27
FR2081883B1 (fr) 1974-04-05
DE2112019A1 (de) 1971-09-30

Similar Documents

Publication Publication Date Title
US3724258A (en) Apparatus for bending elongate objects
US4062216A (en) Metal bending methods and apparatus
US4195506A (en) Method and apparatus for bending elongated materials
EP0065953B1 (fr) Dispositif de fabrication d'un tube metallique
US20100089114A1 (en) Apparatus for bending plates with rolls
JP6041632B2 (ja) 金属板の曲げ加工方法およびその装置
CN101626850B (zh) 用于弯曲待形成为有缝管的板材的边缘带的方法和弯曲压力机
US3287952A (en) Bending machine
US4056960A (en) Means and method for bending elongated materials incorporating two arms
CA1072335A (fr) Methode et mecanisme de cintrage de feuilles a l'etat plastique
US3685330A (en) Method of and apparatus for helically coiling pipe
US4187406A (en) Machine for welding seams in automotive wheel rim blanks
US2316049A (en) Machine for bending pipes and the like
US4646550A (en) Coil bending machine with floating spreaders
US3282076A (en) Brakes for forming plate or sheet workpieces
US5156859A (en) Apparatus for bending a laminated plastic sheet
CN108480510A (zh) 一种扁管自动弯折机
JP3035025B2 (ja) 型材曲げ機
US3452570A (en) Cold tube bending with outer bend wall thickness control
CN110722023A (zh) 钢管矫直设备及钢管矫直方法
GB1344387A (en) Apparatus and method for bending elongated objects
KR19990002703A (ko) 알루미늄 측면판(Profile)의 절곡장치 및 절곡방법
CN118080616A (zh) 无缝钢管的矫直设备
CN216369674U (zh) 一种稳定性高且便于调节角度的手动弯管机
US2024279A (en) Vulcanizing device

Legal Events

Date Code Title Description
PS Patent suit(s) filed