EP0038275B1 - Dispositif de coulée continue d'ébauches de tubes métalliques - Google Patents

Dispositif de coulée continue d'ébauches de tubes métalliques Download PDF

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Publication number
EP0038275B1
EP0038275B1 EP81420055A EP81420055A EP0038275B1 EP 0038275 B1 EP0038275 B1 EP 0038275B1 EP 81420055 A EP81420055 A EP 81420055A EP 81420055 A EP81420055 A EP 81420055A EP 0038275 B1 EP0038275 B1 EP 0038275B1
Authority
EP
European Patent Office
Prior art keywords
mould
blank
molten metal
axis
mold
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
EP81420055A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0038275A1 (fr
Inventor
Michel Mola
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.)
Creusot/loire-Vallourec (societe En Nom Collectif)
Original Assignee
Creusot/loire-Vallourec (societe En Nom Collectif)
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 Creusot/loire-Vallourec (societe En Nom Collectif) filed Critical Creusot/loire-Vallourec (societe En Nom Collectif)
Priority to AT81420055T priority Critical patent/ATE14277T1/de
Publication of EP0038275A1 publication Critical patent/EP0038275A1/fr
Application granted granted Critical
Publication of EP0038275B1 publication Critical patent/EP0038275B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14—Plants for continuous casting
    • B22D11/146—Plants for continuous casting for inclined casting

Definitions

  • the device which is the subject of the invention relates to the production by continuous casting of tube blanks. It relates most generally to blanks of metal tubes of all types, but more particularly applies to the manufacture of blanks of steel tubes of very different shades.
  • the device most often applies to the production of blanks of circular section.
  • French Patent No. 2,414,969 describes a process which makes it possible to obtain, by continuous casting, hollow metallic blanks having an excellent internal and external surface condition.
  • This process consists in introducing the liquid metal into a continuous casting mold of circular section, with a substantially vertical axis, the side wall of which is cooled, then in extracting the blank in the process of solidification at the bottom of the mold according to a curved path. so that, after having passed through a low point, this blank progressively rises to a level at least equal to that of the surface of the liquid metal in the mold, and is cut above this level.
  • the quality of the tube blank obtained results from the combined action of two sets of electromagnetic inductors.
  • a first set is distributed annularly around the axis of the mold in the casting area of the metal and at the start of solidification of the latter in contact with the wall of this mold.
  • This assembly is supplied with low frequency alternating current, so as to cause a rotation of the liquid metal in the mold in a manner known to those skilled in the art.
  • a second assembly is arranged around the blank in the zone where the latter, after passing through a low point, is reached by raising a level close to that of the liquid metal in the mold.
  • This second set of electromagnetic inductors is distributed annularly around the blank whose periphery is solidified, but which also has a large liquid area in the vicinity of the axis. It is supplied with alternating current at a much higher frequency than the first, so as to cause a rapid rotation of the liquid metal, which forms, in the still liquid axial zone of the blank, an elongated well of substantially parabolic section.
  • the blank being extracted continuously, we thus obtain, thanks to the rapid rotation of the still liquid metal against the internal wall, a solidification of this metal on this internal wall of the blank in an extremely regular manner which gives it an excellent surface finish and a very fine grain.
  • DE 1226250 shows the beginning of a continuous casting for solid bodies in which the mold is inclined relative to the vertical.
  • the surface of the liquid metal is shown perpendicular to the axis of the mold but we do not find in this DE 1226250 the description of the specific means which make it possible to arrive at such an orientation of the surface of the liquid metal, means which must compensate for the asymmetry of the forces exerted around the axis of the ingot mold on the liquid metal, forces which naturally tend to create a horizontal liquid surface.
  • EP 0008376 describes a continuous casting process with a vertical mold in which, by using electromagnetic fields applied to the liquid metal being solidified, a turbulent flow is created in the core of the liquid metal, with the aim of improve the solidification structure.
  • Such a method applied to a continuous casting whose mold would be inclined relative to the vertical, cannot generate a surface of stable liquid metal as described in DE 1226250.
  • the invention proposes to specify the means used to obtain, during the casting of the tube continuously, a front of liquid metal in the course of solidification which is symmetrical with respect to the axis of the tube, this so as to satisfy the requirements of vertical bulk and minimum curvature indicated above.
  • electromagnetic means for driving the liquid metal in rotation in the mold around the axis of said mold comprising inductor poles whose windings are supplied with low frequency polyphase current, and arranged around the axis of the mold, so as to creating a rotating field capable of rotating the liquid metal
  • the electromagnetic means comprising at least one inductor pole having an individual magnetomotor force different from the individual magnetomotive force of one or more other inductor poles in order to thus create an asymmetry with respect to the axis of the mold of the forces to which the liquid metal is subjected, and is characterized in that the asymmetry of the magnetomotor forces is obtained by increasing the individual magnetomotor force produced by at least one inductive pole in the upper zone with respect to the axis of the mold, relative to the individual magnetomotor force produced by at least one inductor pole in the area lower and in that the means for extracting and guiding the blank are arranged from the extraction opening of the mold along a curved trajectory, with concavity turned upwards, which has a low point
  • the frequency of the polyphase current supplying the electromagnetic means of the casting mold is advantageously between 4 and 12 Hz.
  • the means for introducing the liquid metal into the mold include a nozzle which is advantageously oriented so as to make an angle of about 30 to 60 ° relative to the axis of the mold and offset with respect to this axis so that the jet liquid metal coming out strikes the surface of the rotating liquid metal giving it an extra boost.
  • the frequency of the polyphase current supplying the second set of electromagnetic means can be between 50 and 300 Hz.
  • At least one inductor pole of the second set of electromagnetic means may be placed in the upper zone relative to the trajectory of the blank so to produce an individual magnetomotor force greater than the individual magnetomotor force produced by at least one inductor pole in the lower zone.
  • a mold (1) of circular cross section has an interior wall (2), for example of copper, behind which extends an annular space (3) in which, by means known per se, creating a circulation of water intended to cool the wall (2).
  • an interior wall (2) for example of copper
  • annular space (3) in which, by means known per se, creating a circulation of water intended to cool the wall (2).
  • a determined angular offset inductors (4) supplied by a low frequency current for example between 4 and 12 Hz.
  • the inductors are arranged at inside the mold in the space (3) and are thus themselves cooled by the water which circulates therein.
  • the mold is inclined so that its longitudinal axis forms with the horizontal an angle between about 30 ° and 60 °; in the case of the figure, this angle is approximately 45 °.
  • This mold is supplied with liquid metal from a distributor (5).
  • This metal for example steel, cools against the wall (2) of the mold and a circular section blank emerges at the bottom of the mold.
  • This blank is extracted continuously by means of guide rollers (9) along a curved path.
  • the installation also comprises, in a conventional manner, secondary cooling means by spraying with water, not shown, in the casting path, as well as means for extracting the blank and discharging it.
  • the electromagnetic fields created by the inductors cause the liquid metal inside the mold to rotate around the longitudinal axis with the formation of a meniscus (10).
  • the asymmetry which it is necessary to establish in the magnetomotor forces depends on many factors: inclination of the axis of the mold, internal dimensions of the mold, physical properties of the metal or of the liquid alloy which is poured, characteristics of the electromagnetic circuits used, nature and frequency of the currents.
  • FIG. 2 shows in more detail a casting mold similar to that of Figure 1.
  • This copper mold (14) has a double wall inside which a hollow space (15) is traversed by cooling water introduced in (16) and discharged in (17).
  • the longitudinal axis of this XY mold is inclined relative to the horizontal at an angle a equal to 45 °.
  • a nozzle (25) is crossed by a stream of liquid metal (26) coming from a distributor not shown.
  • This nozzle is substantially vertical as shown in Figure 2, and it is arranged so that the jet of liquid metal (27) strikes the surface (24) of the metal in rotation inside the mold at a point preferably offset by relative to the axis and chosen according to the direction of rotation imposed on the liquid metal by the rotating field, so as to give this metal an additional impulse.
  • the point of impact of the jet preferably strikes the liquid metal at a distance from the axis of the mold of between approximately half and three quarters of the radius.
  • the jet (27) of liquid metal strikes the surface of the metal in the area to the left of the axis and the rotating field is established so as to drive the liquid metal in the direction of the arrow.
  • the end (18) of the mold in the area below the axis, is extended to prevent liquid metal spills to the outside in the event of a break in the magnetic drive.
  • the upper pole (19) provides the greatest magnetomotive force and, moreover, as shown in the figures, it comprises, in the vicinity of the mold entrance, an additional winding (20) which increases the magnetomotive force in this area.
  • the lower pole (21) provides the weakest magnetomotor force, while the two lateral poles (22) and (23) each provide an average magnetomotive force intermediate between the two extremes.
  • the ratio between the maximum and minimum values of the magnetomotive force is generally adjusted between 2 and 10, depending on the operating conditions.
  • the adjustment of these magnetomotor forces is obtained in a manner known to those skilled in the art by varying in one or more poles, either the intensity of the current, or the number of turns traversed by the current, or even the direction of the current in a part of the turns.
  • the extraction and guiding means which comprise series of rollers such as (9) are arranged along a curved path with concavity turned upwards, and whose radius of curvature is generally 5 to 10 m so as to cancel the slope of descent of the blank, then to make it reach a constant slope of rise, near the average level of the surface of the molten metal in the mold, having an angle of approximately 5 to 25 ° relative to the horizontal.
  • the liquid metal feed speed, the extraction speed and the cooling conditions of the blank along its path are adjusted so that, when the blank reaches a level corresponding to that of the liquid metal in the mold, the section of the metal still liquid in the axial zone of the blank, has a diameter close to the diameter inside of the hollow blank that we want to obtain.
  • a second set of electromagnetic means (11) disposed around the trajectory of the blank creates a rotating field which causes the liquid metal to rotate rapidly inside the blank. with the formation of a kind of well (12).
  • a polyphase current with a frequency between 50 and 300 Hz is preferably used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
EP81420055A 1980-04-15 1981-04-14 Dispositif de coulée continue d'ébauches de tubes métalliques Expired EP0038275B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81420055T ATE14277T1 (de) 1980-04-15 1981-04-14 Vorrichtung zum stranggiessen von rohrluppen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8008402 1980-04-15
FR8008402A FR2480156A2 (fr) 1980-04-15 1980-04-15 Dispositif de coulee continue de metaux, notamment d'acier

Publications (2)

Publication Number Publication Date
EP0038275A1 EP0038275A1 (fr) 1981-10-21
EP0038275B1 true EP0038275B1 (fr) 1985-07-17

Family

ID=9240890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81420055A Expired EP0038275B1 (fr) 1980-04-15 1981-04-14 Dispositif de coulée continue d'ébauches de tubes métalliques

Country Status (6)

Country Link
EP (1) EP0038275B1 (enrdf_load_stackoverflow)
JP (1) JPS57500465A (enrdf_load_stackoverflow)
AT (1) ATE14277T1 (enrdf_load_stackoverflow)
DE (1) DE3171375D1 (enrdf_load_stackoverflow)
FR (1) FR2480156A2 (enrdf_load_stackoverflow)
WO (1) WO1981002990A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58173059A (ja) * 1982-03-03 1983-10-11 Unitika Ltd 金属細線の製造方法
US4566526A (en) * 1982-09-27 1986-01-28 Concast, Incorporated Method and apparatus for semi-horizontal continuous casting
SE464619B (sv) * 1985-09-13 1991-05-27 Olsson Ag Erik Saett och anlaeggning foer straenggjutning med horisontell eller lutande kokill
EP0306751B1 (en) * 1987-09-07 1994-06-29 DANIELI & C. OFFICINE MECCANICHE S.p.A. Casting method for a continuous casting machine of a reduced height and consequential immersed teeming nozzle

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1226250B (de) * 1952-09-06 1966-10-06 Ver Leichtmetallwerke Gmbh Stranggiessverfahren
US3391725A (en) * 1966-01-13 1968-07-09 Concast Inc Process and apparatus for cooling and supporting a continuous casting strand
FR2414969A1 (fr) * 1978-01-23 1979-08-17 Creusot Loire Procede de coulee continue de metaux, notamment d'acier, dispositif pour la mise en oeuvre et ebauche metallique creuse obtenue par ce procede

Also Published As

Publication number Publication date
DE3171375D1 (en) 1985-08-22
FR2480156A2 (fr) 1981-10-16
WO1981002990A1 (fr) 1981-10-29
ATE14277T1 (de) 1985-08-15
FR2480156B2 (enrdf_load_stackoverflow) 1982-04-23
EP0038275A1 (fr) 1981-10-21
JPS57500465A (enrdf_load_stackoverflow) 1982-03-18

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