US3796849A - Method and apparatus for heating and cooling moving tubes - Google Patents

Method and apparatus for heating and cooling moving tubes Download PDF

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Publication number
US3796849A
US3796849A US00323921A US3796849DA US3796849A US 3796849 A US3796849 A US 3796849A US 00323921 A US00323921 A US 00323921A US 3796849D A US3796849D A US 3796849DA US 3796849 A US3796849 A US 3796849A
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United States
Prior art keywords
inductor
sprinkler
tube
heater
carriage
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Expired - Lifetime
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US00323921A
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English (en)
Inventor
M Cuvelier
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Elphiac SA
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Elphiac SA
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Publication date
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Definitions

  • ABSTRACT A method and apparatus for heating and cooling a large diameter moving metal tube by progressively displacing it across a heating inductor, the induction current and the moving speed of the tube being adjusted so that the tube reaches its tempering temperature as it comes out of the inductor, and progressively cooling the tube rapidly at a predetermined distance from the outlet of the inductor, the distance being selected to enable a minimum tempering time to occur outside the inductor,
  • a method for heating horizontally moving tubes wherein the tubes to be heated are run through a heating inductor by means of an appropriate conveying means is well known.
  • the annealing operation may produce unacceptable deformation of the tube. This danger is all the more significant when as the wall thickness of the tube is small. It is an object of the pres ent invention to avoid this danger.
  • the method and apparatus in accordance with the present invention is characterized in that a tube work piece is supported horizontally by means of rollers located at opposite ends of the inductor and, simultaneously, between two center pins associated with upright extensions ofa carriage moving horizontally along a guiding path running under the inductor, in that the inductor current and the moving speed of the tube are adjusted so that the tube progressively reaches the tempering temperature of the metal of the tube when emerging from the inductor; in that a circular sprinkler, coaxial with the inductor, is set in the path of the tube at a predetermined distance from the inductor outlet; in that the heated tube is sprinkled with a refrigerating fluid by means of said sprinkler; and in that the distance between the inductor and the sprinkler is adjusted so that the sudden cooling of the tube occurs after a time sufficient for previously obtaining tempering of the matal outside the inductor.
  • FIGURE of the drawing shows, partially in section, a tube heating apparatus according to the invention.
  • the apparatus comprises two lateral frames I, linked by a table 2, and supporting conical rollers 3 so arranged as to provide a free space between the concial rollers of both lateral frames.
  • a heating inductor 4 is laid on the table 2 and connected to an AC. generator 5 provided with a conventional current adjusting means.
  • the current frequency is selected as a function of the desired penetration depth of the current induced in the metal of the tube. For tubes of l to 2 meters in diameter, this frequency is in the order of 52 to 60 Hz.
  • Under the inductor 4 there is provided a guide way, for instance a pair of horizontal rails 6, along which a carriage 7 is moved.
  • the carriage 7 includes upright members 7 which hold two center pins 8 and 9 which are about in line with the axis of the inductor 4 and lie at opposite ends of the inductor.
  • the rollers 3 do not interfere with the motion of the carriage 7 along the rails 6, in spite of the pins 8 and 9, since the roller spindles are fixed only to one side in one of the frames 1.
  • the carriage 7 is driven by a geared-down motor 10 equipped with speed adjusting means, for example, by means of a master screw 11.
  • a circular sprinkler 12, coaxial with the inductor 4, is mounted at a certain distance from the latter.
  • the sprinkler is connected to a pipe 13 and fed with a refrigerating fluid such as water,
  • valve 14 the inlet of which is controlled by valve 14.
  • the distance between the sprinkler l2 and the inductor 4 is adjustable by means of, for example, three screws 15.
  • the tube 16 to be heated is placed on the conveyor formed by the concial rollers 3 and is clamped between the center pins 8 and 9.
  • the carriage 7 is set in starting position and the generator 5 and the geareddown motor driving the master screw 11 are switched on.
  • the current in the inductor 4 and the speed of the tube are adjusted so that the tube 16 reaches the tempering temperature of the metal of the tube as the latter reaches the exit end of the inductor 4. Soon after, the tube 16 is suddenly cooled by the sprinkler 12.
  • the delay must be sufficient to enable sufficient time for obtaining tempering of the metal to take place, but must be as short as possible so as to restrict to a minimum length the hot area of the tube-where the metal strength is very weak, since deformation and warpage could easily occur.
  • the requried delay is set up by means of screws 15 which enable adjustment of the distance of the sprinkler from the exit end of the inductor. Depending upon the size of the tube and the metal in volved, the tempering time required is easily determined and will need to be determined for every different type of workpiece in any event.
  • Adjustment by screws 15 of the distance between the exit end of the inductor 4 and the sprinkler l2 achieves the desired time delay between the time that portion of the tube reaching tempering temperature emerges from the inductor and the time at which that portion is cooled by the sprinkler.
  • the center point 9 supporting the rear end of the tube 16 to be heated is provided with a sleeve 17, the diameter of which is the same as that of tube 16 and which extends coaxial therewith.
  • This sleeve may be made either ofinsulating material or of a metal such as copper.
  • the wall thickness of this sleeve 17 is preferably smaller than the one required for full depth penetration of the electric induced current.
  • the sleeve 17 may be cooled by water, particularly if it is made of a magnetic material such as steel. Water cooling is moreover used for all other parts of the apparatus which are susceptible of being inadvertently heated by any heat source.
  • the length of the sleeve 17 depends in part on the length of the ring of refrigerating fluid produced by the sprinkler 12.
  • the length of the sleeve 17 depends on the various operating parameters surrounding the heating and cooling of a particular tubular workpiece. The length will usually depend on the speed of travel of the carriage for a particular workpiece, and the normal time delay needed to shut off the flow of cooling fluid once the tubular workpiece has progressed through the sprinkler.
  • the sleeve is of sufflcient length to enable the stopping of the carriage and the shutting off of the cooling fluid before the free end of the sleeve passes completely through the sprinkler after the tube workpiece itself has been cooled.
  • a method for inductively heating and subsequently cooling a large diameter metallic tubular workpiece comprising:
  • Apparatus for heating and cooling large diameter metal tubes comprising:
  • annular inductor heating means for heating tubular workpieces horizontally and progressively advanced axially through said inductor, said inductor having a variable source of current supply;
  • roller conveyor means for supporting tubular workpieces advanced through said inductor, said roller conveyor means being located outside of and spaced from both ends of said inductor;
  • a carriage means axially movable horizontally beneath said inductor, said carriage including upwardly extending members, the inductor heater being located in an area between said members, and means for axially fixing the position of a tubular workpiece between said members;
  • variable speed drive means for said carriage e. variable speed drive means for said carriage
  • a sprinkler coaxially located adjacent the exit end of said inductor and adjustably mounted with respect to said heater whereby the distance between the exit of said heater and the sprinkler can be varied;
  • the inductor current supply, the carriage drive rate, and the distance between the exit end of the inductor and the sprinkler can be adjusted such that a metal tubular workpiece progressively advanced through said inductor by said carriage means reaches tempering temperature just as it reaches the exit end of the inductor and thereafter may be progressively rapidly cooled after a desired minimal time interval sufficient to achieve tempering of the tubular workpiece between the time it leaves the inductor heater and the time it is rapidly cooled.
  • roller conveyor in (c) comprises multiple, laterally spaced roller pairs between which said carriage upright extensions pass when the tubular workpiece supported thereby is advanced through the inductor and sprinkler.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
US00323921A 1972-01-14 1973-01-15 Method and apparatus for heating and cooling moving tubes Expired - Lifetime US3796849A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE778032A BE778032A (fr) 1972-01-14 1972-01-14 Procede de chauffage au defile de tubes et installation permettant de realiser ce procede.

Publications (1)

Publication Number Publication Date
US3796849A true US3796849A (en) 1974-03-12

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US00323921A Expired - Lifetime US3796849A (en) 1972-01-14 1973-01-15 Method and apparatus for heating and cooling moving tubes

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US (1) US3796849A (fr)
BE (1) BE778032A (fr)
CA (1) CA974601A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2350402A1 (fr) * 1976-05-08 1977-12-02 Aeg Elotherm Gmbh Traitement thermique de tubes d'acier a paroi epaisse
FR2379609A1 (fr) * 1977-02-08 1978-09-01 Nippon Kokan Kk Procede et appareil pour traiter thermiquement des pieces metalliques
US4142713A (en) * 1974-11-26 1979-03-06 Nippon Steel Corporation Method of heat-treatment of welded pipe and apparatus therefor
FR2510139A1 (fr) * 1981-07-24 1983-01-28 Nippon Kokan Kk Appareil de rechauffage des extremites de tubes en acier a refoulements exterieurs
US5027634A (en) * 1990-02-28 1991-07-02 Granco-Clark, Inc. Solutionizing taper quench
US5075529A (en) * 1988-10-17 1991-12-24 Takeshi Hirose Electromagnetic syringe needle disposer
US20080203139A1 (en) * 2001-06-29 2008-08-28 Mccrink Edward J Method for controlling weld metal microstructure using localized controlled cooling of seam-welded joints

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142713A (en) * 1974-11-26 1979-03-06 Nippon Steel Corporation Method of heat-treatment of welded pipe and apparatus therefor
FR2350402A1 (fr) * 1976-05-08 1977-12-02 Aeg Elotherm Gmbh Traitement thermique de tubes d'acier a paroi epaisse
FR2379609A1 (fr) * 1977-02-08 1978-09-01 Nippon Kokan Kk Procede et appareil pour traiter thermiquement des pieces metalliques
FR2510139A1 (fr) * 1981-07-24 1983-01-28 Nippon Kokan Kk Appareil de rechauffage des extremites de tubes en acier a refoulements exterieurs
US5075529A (en) * 1988-10-17 1991-12-24 Takeshi Hirose Electromagnetic syringe needle disposer
US5027634A (en) * 1990-02-28 1991-07-02 Granco-Clark, Inc. Solutionizing taper quench
US20080203139A1 (en) * 2001-06-29 2008-08-28 Mccrink Edward J Method for controlling weld metal microstructure using localized controlled cooling of seam-welded joints
US7540402B2 (en) 2001-06-29 2009-06-02 Kva, Inc. Method for controlling weld metal microstructure using localized controlled cooling of seam-welded joints

Also Published As

Publication number Publication date
CA974601A (en) 1975-09-16
BE778032A (fr) 1972-07-14

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