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

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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

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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
    • 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
FR8505171 1985-04-04
FR8505171A FR2579912B1 (enrdf_load_stackoverflow) 1985-04-04 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 (enrdf_load_stackoverflow)
EP (1) EP0196653B1 (enrdf_load_stackoverflow)
AT (1) ATE44897T1 (enrdf_load_stackoverflow)
DE (1) DE3664574D1 (enrdf_load_stackoverflow)
FR (1) FR2579912B1 (enrdf_load_stackoverflow)
ZA (1) ZA862521B (enrdf_load_stackoverflow)

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.
DE3173625D1 (en) * 1980-08-05 1986-03-13 Stein Industrie Method and apparatus for bending a long metal object
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
DE3664574D1 (en) 1989-08-31
FR2579912A1 (enrdf_load_stackoverflow) 1986-10-10
FR2579912B1 (enrdf_load_stackoverflow) 1989-05-26
ATE44897T1 (de) 1989-08-15
US4686844A (en) 1987-08-18
ZA862521B (en) 1986-12-30
EP0196653A1 (fr) 1986-10-08

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