US3742748A - Method and apparatus for producing an annular collar from a pipe in a hot state - Google Patents

Method and apparatus for producing an annular collar from a pipe in a hot state Download PDF

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Publication number
US3742748A
US3742748A US00154775A US3742748DA US3742748A US 3742748 A US3742748 A US 3742748A US 00154775 A US00154775 A US 00154775A US 3742748D A US3742748D A US 3742748DA US 3742748 A US3742748 A US 3742748A
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United States
Prior art keywords
rollers
pipe
outside
bending
tube
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Expired - Lifetime
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US00154775A
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English (en)
Inventor
K Ehm
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Mannesmann Demag AG
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Demag AG
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Publication date
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    • 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
    • B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/02—Winding-up or coiling
    • B21C47/04—Winding-up or coiling on or in reels or drums, without using a moving guide
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form

Definitions

  • ABSTRACT A method of producing an annular tubular collar from a tube or pipe in a hot state and without introducing transverse forces which tend to deform the crosssection of the tube and using pairs of opposed rollers, each pair including an inside roller arranged on the inside of the pipe bend and an outside roller arranged on the outside of the bend, comprises regulating the pe-' ripheral speed of the inside and outside rollers to produce a braking effect by the inside rollers on thetube.
  • the apparatus includes at least three pairs of oppose rollers between which the pipe to be bent is directed,
  • the inside rollers are made with a relatively small diameter compared to the outside rollers and in another/arrangement, the inside rollers have a larger diameter than the outside rollers.
  • the inside .rollers are driven at a peripheral speed so that they provide a braking action on the tube to effect an. imposition of a longitudinal force directed opposite to the direction of passage to enhance the bending of the pipe and to reduce transverse forces acting on the pipe which tends to distort its cross-section.
  • This invention relates in general to the apparatus and method for forming tubular elements or pipes and, in particular, to a new and useful apparatus and method for forming pipes into coils and in which the driving speed of interior and exterior rollers is regulated to reduce the transversely acting forces which tend to distort the pipe cross-section.
  • the present invention is an improvement over German Pat. application P 19 36 515.2 corresponding to U.S. Pat. Application Ser. No. 52,796, filed July 7, 1970, now abandoned.
  • the aforementioned patent describes a method of producing a coil of pipe from a pipe in a hot state. The method is preferably carried out following the production of the pipe in the hot state in which there is a stretch reduction.
  • the pipe is bent before the turns are laid with a bending radius which corresponds to the respective turn of the annular collar to be formed.
  • the same velocity is imparted to the pipe during the bending and the laying of the turn as the pipe had immediately before it was moved into association with the bending apparatus.
  • the arrangement for carrying out the method is characterized by a bending apparatus which has an adjustable bending radius. This bending apparatus comprises substantially three pairs of opposed rolls between which the pipe is bent and which form a so-called bending triangle or a plurality of such triangles.
  • the rear straight section of the pipe should be adjusted during the bending operation to an additional sliding force which is variable in size and uniform over the pipe cross-section and which acts in the longitudinal direction of the pipe as a pressure in the direction of the molded bending piece.
  • This invention provides an improved arrangement of the apparatus disclosed in the previously mentioned applications, so that the ovaling of the cross-section appearing during the bending is effectively prevented durconsideration that the transverse forces extended bying the production of the annular collar, or at least it is substantially reduced.
  • the invention starts from the the bending apparatus can be reduced if it is possible to produce the bending moment which is necessary for bending in any other way.
  • the method of the invention provides the production of a continuous coil from a pipe in a hot state where the pipe arrives preferably from a processing device arranged ahead of the bending operation and it is bent before the turn'is laid on the bending apparatus with a bending radius which corresponds to the radius of the collar to be formed.
  • the same velocity is imparted to the pipe during the bending and the laying of the turn which the pipe has immediately before'the bending as set forth in the patent mentioned previously. It is char acterized in that the longitudinal forces acting on the pipe during the bending which vary in size and direction over the pipe cross-section are so directed by the apparatus that a bending moment enhancing the desired bending of the pipe is exerted by them.
  • the application of these additional longitudinal forces on the pipe is effected by driving at least some of the bending and counter-rollers such that there is braking effect on the interior surface of the collar being formed during the bending which is produced different circumferential velocities.
  • the circumferential velocities of the 'rollers are arranged on the outside of the pipe bend is greater than that of the rollers arranged on the inside of the pipe bend.
  • the adjustment of the circumferential velocity is determined by the torque of the individual rollers which is to be transmitted and which is necessary for the application of the longitudinal forcesgln comparison to the known method wherein a rotatable molded bending piece is employed in which the longitudinal forces act on the end which is not to be bent and pushes the pipe into the device, it is possible with the invention to reduce the transverse forces for bending.
  • the invention provides an arrangement which is characterized by inside and outside rollers which in respect to the collar being 7 formed, act on the pipe so that there is a braking effect arrangement, the rollers arranged outside the bend have a larger radius than those arranged inside the bend of the pipe and all of the rollers are driven jointly to result in different circumferential velocities in order to produce the desired bending moment which is'applied by the frictional drag forces by the slower speed of theinside rollers.
  • rollers on the inside of the pipe bend With certain geometric ratios of the pipe, it was found advantageous to provide the rollers on the inside of the pipe bend with a very large diameter so that the pipe is supported over a great length during the bending. It is therefore suggested that the'rollers inside the bend be provided with a larger diameter than the rollers outside the bend. For this case, when the rollers are used which have the diameter inside the bend as outside, the rollers are driven individually or in groups with variable speed gears.
  • an object of the invention to provide an improved method of bending pipe which includes engagingthe pipe both along the inside of the bend and the outside of the bend by opposing pairs of rollers which are driven'at circumferential speeds such that the rollers act on the pipe without producing transverse forces which adversely effect the cross-section of the pipe being formed.
  • a further object of the invention is to provide an apparatus for bending pipe which includes a plurality of sets of opposed rollers with the ones arranged on the inside of the bend being driven at a slower peripheral speed than the ones on the outside of the bend in order to counteract the setting up of transverse forces.
  • a further object of the invention is to provide a device for bending pipe which is simple in design, rugged in construction and economical to manufacture.
  • FIG. I is a partial section through a bending apparatus constructed in accordance with the invention.
  • FIG/2 is a view similar to FIG. 1 but showing inside bending rollers of larger diameter than the outside bending rollers;
  • FIG. 3 is a section taken along the line IIIlII of FIG. 2.
  • the invention embodied therein comprises a bending apparatus, generally designated 10, for bending a tube or pipe 1 into a coil after is emerges from the stretch-reducing rolling mill and is still in a hot condition.
  • the bending apparatus 10 comprises a plurality of pairs, for example, three pairs of opposed rolls, each pair including an inside roll 5 and an outside roll 4.
  • the bent pipe which emerges from the bending apparatus is fed to a reel pot (not shown) in which the pipe turns are laid to form a continuous coil.
  • the pipe 1 can be considered in the bending range an a beam on two supports with an individual force arranged between them.
  • the bending moment is effected by the individual forces applied by the central inside roller 5 on the pipe 1 in connection with the supporting forces of the outer rollers 4. These forces which are perpendicular to the pipe axis produce so-called transverse forces in the pipe and can also deform the circular cross-section of the pipe.
  • the inside rollers and the outside rollers are operated such as to introduce longitudinal forces into the pipe by the action of friction between the pipe and the rollers.
  • the longitudinal forces are produced by braking the rollers 5 on the inside of the bend in comparison to the movement forces produced by the outside rollers 4.
  • the braking force is a longitudinal force directed opposite to the direction of pipe passage and produces tensile forces outside the bend which are directed in the direction of the passage of the pipe.
  • the circumferential velocities of the inside rollers 5 which are arranged inside the pipe is reduced more than corresponds to the effective longitudinal velocity of the pipe 1 in the pressure zone 3 so that they have a braking effect on the pipe 1.
  • the circumferential velocities of the outside rollers 4 which are arranged outside the pipe bend and which engage the pipe 1 in a tension zone 2 are correspondingly increased.
  • the adjustment of the circumferential velocities of the inside rollers and the outside rollers 4 is effected by taking into account the respective roller diameters and the rotational speed, or when the speed is to be kept at a constant rotational speed, by employing different diameters for the inside rollers 5 and the outside rollers 4.
  • the inside rollers 5 have a smaller diameter than the outside rollers 4 so that when these rollers are driven at the same speed, there is a retarding effect on the inside of the bend causing a frictional force to act in the longitudinal direction on the pipe 1.
  • the inside rollers 5' are of a large diameter than the outside rollers 4', and they must be driven either individually or in groups at variable speeds in order to accomplish the frictional impartation of force at the inside of the bend as in the previous case.
  • the speed is controlled in accordance with the torque which is measured on the individual rollers or the measured on the individual rollers or the measured current consumption of the driving motors may give an indication of this.
  • a device for producing an annular tubular collar from a tube in a hot state comprising a plurality of pairs of opposed inside and outside rollers arranged to define a bending path therebetween through which the pipe is adapted to pass, and means for driving at least one pair of said rollers to drive the inside rollers at a different peripheral speed than the outside rollers.
  • a device according to claim 4, wherein said drive means drives said inside rollers at a speed to produce a braking effect by'said inside rollers on the pipe.
  • a device including means for driving the inside rollers at a different speed from said outside rollers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US00154775A 1970-07-03 1971-06-21 Method and apparatus for producing an annular collar from a pipe in a hot state Expired - Lifetime US3742748A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702032937 DE2032937A1 (de) 1970-07-03 1970-07-03 Verfahren zum Herstellen eines Ringbundes aus einem Rohr sowie eine Vorrichtung zum Ausüben des Verfahrens

Publications (1)

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US3742748A true US3742748A (en) 1973-07-03

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US00154775A Expired - Lifetime US3742748A (en) 1970-07-03 1971-06-21 Method and apparatus for producing an annular collar from a pipe in a hot state

Country Status (3)

Country Link
US (1) US3742748A (de)
JP (1) JPS512074B1 (de)
DE (1) DE2032937A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4844145A (en) * 1987-11-03 1989-07-04 Steel Metallurgical Consultants, Inc. Bending of continuously cast steel with corrugated rolls to impart compressive stresses
US4974540A (en) * 1988-12-30 1990-12-04 Fabrique De Fer De Maubeuge Device for deflecting a hot steel strip covered with a fragile coating
US5431035A (en) * 1993-03-10 1995-07-11 Sheen; Reen Y. Hydraulic pipe bender of large dimension
US5802719A (en) * 1994-03-14 1998-09-08 Oec Medical Systems, Inc. One piece C-arm for X-ray diagnostic equipment
US20100263424A1 (en) * 2009-04-21 2010-10-21 Fairmount Technologies Llc Stretch Roll Forming
US20110180735A1 (en) * 2007-08-02 2011-07-28 Andreas Stranz Device for supplying a fluid for explosion forming
CN103394566A (zh) * 2013-08-19 2013-11-20 济钢集团有限公司 一种可调式弯管装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US928073A (en) * 1908-08-21 1909-07-13 Philadelphia Pipe Bending Company Method of coiling pipe.
US2327706A (en) * 1941-05-09 1943-08-24 Johns Manville Method of curving material
US3036622A (en) * 1958-02-28 1962-05-29 Gifford L Hitz Process of bending metal by wave formation
US3566654A (en) * 1968-02-20 1971-03-02 Republic Steel Corp Coiling apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US928073A (en) * 1908-08-21 1909-07-13 Philadelphia Pipe Bending Company Method of coiling pipe.
US2327706A (en) * 1941-05-09 1943-08-24 Johns Manville Method of curving material
US3036622A (en) * 1958-02-28 1962-05-29 Gifford L Hitz Process of bending metal by wave formation
US3566654A (en) * 1968-02-20 1971-03-02 Republic Steel Corp Coiling apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4844145A (en) * 1987-11-03 1989-07-04 Steel Metallurgical Consultants, Inc. Bending of continuously cast steel with corrugated rolls to impart compressive stresses
US4974540A (en) * 1988-12-30 1990-12-04 Fabrique De Fer De Maubeuge Device for deflecting a hot steel strip covered with a fragile coating
US5431035A (en) * 1993-03-10 1995-07-11 Sheen; Reen Y. Hydraulic pipe bender of large dimension
US5802719A (en) * 1994-03-14 1998-09-08 Oec Medical Systems, Inc. One piece C-arm for X-ray diagnostic equipment
US20110180735A1 (en) * 2007-08-02 2011-07-28 Andreas Stranz Device for supplying a fluid for explosion forming
US20100263424A1 (en) * 2009-04-21 2010-10-21 Fairmount Technologies Llc Stretch Roll Forming
US9221088B2 (en) * 2009-04-21 2015-12-29 Fairmont Technologies, Llc Stretch roll forming
CN103394566A (zh) * 2013-08-19 2013-11-20 济钢集团有限公司 一种可调式弯管装置

Also Published As

Publication number Publication date
SU396864A3 (de) 1973-08-29
DE2032937A1 (de) 1972-02-03
JPS512074B1 (de) 1976-01-22

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