EP0196653B1 - Procédé de cintrage d'un tube métallique épais, et dispositif pour sa mise en oeuvre - Google Patents

Procédé de cintrage d'un tube métallique épais, et dispositif pour sa mise en oeuvre Download PDF

Info

Publication number
EP0196653B1
EP0196653B1 EP86104417A EP86104417A EP0196653B1 EP 0196653 B1 EP0196653 B1 EP 0196653B1 EP 86104417 A EP86104417 A EP 86104417A EP 86104417 A EP86104417 A EP 86104417A EP 0196653 B1 EP0196653 B1 EP 0196653B1
Authority
EP
European Patent Office
Prior art keywords
tube
periphery
zone
heated zone
temperature
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
EP86104417A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0196653A1 (fr
Inventor
Jacques Nicolas
Gilbert Degrande
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.)
Stein Industrie SA
Original Assignee
Stein Industrie SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stein Industrie SA filed Critical Stein Industrie SA
Priority to AT86104417T priority Critical patent/ATE44897T1/de
Publication of EP0196653A1 publication Critical patent/EP0196653A1/fr
Application granted granted Critical
Publication of EP0196653B1 publication Critical patent/EP0196653B1/fr
Expired 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
    • 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
    • B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
    • B21D7/162—Heating equipment

Definitions

  • the present invention relates to methods of bending a thick metal tube of constant cross section, by localized heating of a narrow zone around the periphery of this tube using a heating collar surrounding this zone, pushed on one end of the tube and maintenance of its other end by a pivoting arm, in which the temperature of the heated zone around the periphery of the tube is kept substantially constant a) according to a first variant, by detecting the temperature of the latter at at least two points of this perimeter, one of which is on the side of the center of curvature, and the other opposite to the first, and by increasing or decreasing the heat input at one or other of these points depending on whether the temperature is lower or higher at a setpoint corresponding to a uniform temperature around the heated zone, b) according to a second variant, by detecting the air gap separating the heating collar from the circumference of this zone, at at least two points of this periphery, one of which is on the side of the center of curvature, and the other opposite to the first, and by increasing or decreasing the heat input at one
  • the object of the present invention is to provide methods and devices for bending a thick metal tube which reduce the temperature gradient between the external and internal surfaces of the heated zone to a relatively low value, which ensures good control. metallurgical behavior of the tube to be bent, and correspondingly reduce the average coefficient of plasticity stress in this area, and which as a result ensure a greater hourly production of bent tube.
  • the methods according to the invention are characterized in that there is in the tube, inside the heated zone, an insulator to reduce the temperature gradient between the external and internal surfaces of the tube in the heated zone.
  • a first device for bending a thick metal tube of constant cross section by localized heating of a narrow zone around the periphery of this tube, comprising a heating collar surrounding this zone, pushing means on one end of the tube, a pivoting arm for holding its other end, means for keeping the temperature of the heated zone substantially constant around the periphery of the tube by detecting the temperature of the latter at at least two points of this periphery, including the one is on the side of the center of curvature, and the other opposite to the first, and by increasing or decreasing the heat input at one or other of these points depending on whether the temperature there is higher or lower than a set value corresponding to a uniform temperature around the heated zone, is characterized in that it comprises a cylindrical carriage with rollers for internal guidance of the tube, to which is connected downstream with respect to the direction of advance of the tube, a metal support ring covered with a layer of insulation and held by a fixed rod in a position such that the layer of insulation is at the heated zone of the tube.
  • a second device for bending a thick metal tube of constant cross section by localized heating of a narrow zone around the periphery of this tube, comprising a heating collar surrounding this zone, pushing means on one end of the tube, in a pivoting arm for holding its other end, means for keeping the temperature of the heated zone substantially constant around the periphery of the tube by detecting the air gap separating the heating collar from the periphery of this zone at least two points of this circumference, one of which is on the side of the center of curvature, and the other opposite to the first, and by increasing or decreasing the heat input at one or the other of these points depending on whether the air gap y is greater or less than a set value corresponding to a uniform air gap around the periphery of the heated zone, is also characterized in that it comprises a cylindrical carriage with rollers guiding the inner tube, to which is connected é downstream with respect to the direction of advance of the tube, a metal support ring covered with a layer of insulation and maintained by a fixed rod a
  • the invention applies more particularly to low-alloy steel tubes containing 2-2.5% by weight of chromium and 0.9-1.2% by weight of molybdenum, in particular those corresponding to the grade known as 10 CD 9.10 ( DIN 10 Cr Mo 9.10), whose metallurgical behavior and the plasticity stress coefficient varies with temperature.
  • the thick tube to be bent 1 undergoes a longitudinal thrust exerted by the shoe 2.
  • an arm 3 pivoting about an axis 4 and enclosing the tube in a jaw 5 ensures the bending of the tube, brought locally to a temperature raised by an inductive collar 6.
  • a diabolo 7 guides the tube externally upstream and near the zone heated by the heating collar.
  • a carriage 8 is held by a rod 9 connected to a fixed point 10 at a constant distance from this fixed point.
  • This carriage is provided with guide rollers 11, 12, 13. It is connected to this carriage on the side opposite to the rod a support ring 14 provided on its periphery with a layer 15 of calorific such as rock wool.
  • the distance D between the attachment point 10 of the rod 9 and the plane of symmetry of the heated zone (or of the thermal insulation) must be kept constant.
  • the support ring 14 is formed for example of four 90 ° sectors connecting to each other by means of cover sheets. On its cheeks 17, 18 secured by a spacer 19, flanges 20, 21 are fixed supporting the rollers 11, 12.
  • a bracket 22 carries a support rod for a flange 24 carrying the roller 13. The flange 24 is repelled by a helical spring 25 towards the internal wall of the tube.
  • the insulation 15 decreases the temperature gradient through the thickness of the tube, and ensures thus an average coefficient of plasticity stress of the tube greater than that which would be obtained in the absence of heat insulation. It therefore makes it possible to increase the speed of advance of the tube and the hourly production of bent tube, and correspondingly makes it possible to increase the capacity in diameter and thickness of the bendable tubes on the machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP86104417A 1985-04-04 1986-04-01 Procédé de cintrage d'un tube métallique épais, et dispositif pour sa mise en oeuvre Expired EP0196653B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86104417T ATE44897T1 (de) 1985-04-04 1986-04-01 Verfahren zum biegen eines dickwandigen rohres und vorrichtung zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8505171A FR2579912B1 (xx) 1985-04-04 1985-04-04
FR8505171 1985-04-04

Publications (2)

Publication Number Publication Date
EP0196653A1 EP0196653A1 (fr) 1986-10-08
EP0196653B1 true EP0196653B1 (fr) 1989-07-26

Family

ID=9317966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86104417A Expired EP0196653B1 (fr) 1985-04-04 1986-04-01 Procédé de cintrage d'un tube métallique épais, et dispositif pour sa mise en oeuvre

Country Status (6)

Country Link
US (1) US4686844A (xx)
EP (1) EP0196653B1 (xx)
AT (1) ATE44897T1 (xx)
DE (1) DE3664574D1 (xx)
FR (1) FR2579912B1 (xx)
ZA (1) ZA862521B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003797A1 (de) * 1990-02-08 1991-08-14 Schaefer Maschbau Wilhelm Vorrichtung zum biegen von rohren oder dergleichen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT390743B (de) * 1988-09-16 1990-06-25 Voest Alpine Stahl Donawitz Verfahren zur herstellung von windungslegerrohren
JP6205239B2 (ja) * 2013-10-31 2017-09-27 第一高周波工業株式会社 金属管の曲げ加工装置、蛇行管の製造方法及び蛇行管

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1891338A (en) * 1931-02-09 1932-12-20 Lester W Snell Method of and means for bending tubes
FR1095980A (fr) * 1953-02-19 1955-06-08 Babcock & Wilcox France Procédé et appareil pour le cintrage de tubes ou tuyaux
US3896649A (en) * 1974-03-04 1975-07-29 Rollmet Inc Method and apparatus for bending pipe
DE2555326C3 (de) * 1975-12-05 1978-10-19 Mannesmann Ag, 4000 Duesseldorf Vorrichtung zum Biegen von Großrohren
NL165667C (nl) * 1976-09-03 1981-05-15 Cojafex Werkwijze en inrichting voor het continu voortschrijdend buigen van langgerekte voorwerpen, zoals buizen.
EP0045470B1 (fr) * 1980-08-05 1986-01-29 STEIN INDUSTRIE Société anonyme dite: Procédé et dispositif de cintrage d'un élément métallique allongé
JPS5921434A (ja) * 1982-07-29 1984-02-03 Hitachi Ltd 金属管の曲げ加工法及びその装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003797A1 (de) * 1990-02-08 1991-08-14 Schaefer Maschbau Wilhelm Vorrichtung zum biegen von rohren oder dergleichen

Also Published As

Publication number Publication date
US4686844A (en) 1987-08-18
FR2579912B1 (xx) 1989-05-26
EP0196653A1 (fr) 1986-10-08
DE3664574D1 (en) 1989-08-31
FR2579912A1 (xx) 1986-10-10
ZA862521B (en) 1986-12-30
ATE44897T1 (de) 1989-08-15

Similar Documents

Publication Publication Date Title
EP0196653B1 (fr) Procédé de cintrage d'un tube métallique épais, et dispositif pour sa mise en oeuvre
US4177661A (en) Method and apparatus for bending large pipes
CH375807A (fr) Procédé de soudage d'un organe de forme allongée sur une surface courbe et appareil pour sa mise en oeuvre
FR2628093A1 (fr) Four prechauffe pour recipients en verre destines a recevoir des etiquettes thermoretractables
EP0293417B1 (fr) Fibre optique revetue d'un manchon metallique
EP0045470B1 (fr) Procédé et dispositif de cintrage d'un élément métallique allongé
EP0548231A1 (fr) Procede pour reparer ou restaurer sur place un tron on d'une canalisation ou d'une enceinte destinee a contenir ou contenant un fluide sous pressions, et dispositif pour la mise en uvre de ce procede.
EP0578589B1 (fr) Dispositif de chauffage d'un fil en mouvement
FR2512481A1 (fr) Dispositif de supportage tangentiel d'un reservoir horizontal d'epaisseur faible par rapport a son diametre
EP0650789A1 (fr) Cylindre de coulée d'une installation de coulée continue sur un ou entre deux cylindres
EP1002665A1 (fr) Roue de sécurité, procédé de fabrication d'une telle roue et bogie équipé d'une telle roue
FR2501845A1 (fr) Procede et appareil d'admission continue d'une matiere carbonee en morceaux dans une cuve
EP0527068A1 (fr) Rouleau de support ou d'entraînement de produits plats notamment pour installation de traitemant en continu
BE845136R (fr) Support utilisable dans une tuyauterie de transport souterrain de fluides caloporteurs
EP0522921B1 (fr) Rouleau de support et/ou d'entraînement de produits plats, comportant un capteur
EP0376814B1 (fr) Dispositif déflecteur d'une bande d'acier chaude et recouverte d'un revêtement fragile
EP0348266B1 (fr) Détection d'une feuille de verre
FR2704167A1 (fr) Procédé et dispositif pour isoler de l'atmosphère une tête de soudage.
EP0051539B1 (fr) Renforcement des rouleaux dans une installation transportant du verre à haute température
FR2663573A1 (fr) Busette de coulee d'un metal liquide dans une lingotiere de coulee continue.
FR2458346A1 (fr) Procede de fabrication de tubes a ailettes helicoidales soudees et dispositif pour sa mise en oeuvre
EP0083291A2 (fr) Procédé et dispositif de recuit continu de fils métalliques
BE840761A (fr) Procede et dispositif pour la mesure de temperature superficielle d'uncorps, notamment d'un lingot de metal
BE1004076A7 (fr) Procede et dispositif pour supporter un produit metallique coule en continu.
FR2598945A1 (fr) Dispositif de cintrage d'un element metallique allonge

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19870407

17Q First examination report despatched

Effective date: 19880601

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 44897

Country of ref document: AT

Date of ref document: 19890815

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3664574

Country of ref document: DE

Date of ref document: 19890831

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19910117

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19910118

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19910124

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19910131

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910227

Year of fee payment: 6

Ref country code: DE

Payment date: 19910227

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19910429

Year of fee payment: 6

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19910430

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19920401

Ref country code: AT

Effective date: 19920401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19920402

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19920430

Ref country code: CH

Effective date: 19920430

Ref country code: BE

Effective date: 19920430

BERE Be: lapsed

Owner name: STEIN INDUSTRIE

Effective date: 19920430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19921101

GBPC Gb: european patent ceased through non-payment of renewal fee
NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19921230

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930101

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 86104417.0

Effective date: 19921108

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050401