EP0284565B1 - Elektromagnetische Stranggiesskokille - Google Patents

Elektromagnetische Stranggiesskokille Download PDF

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Publication number
EP0284565B1
EP0284565B1 EP88810179A EP88810179A EP0284565B1 EP 0284565 B1 EP0284565 B1 EP 0284565B1 EP 88810179 A EP88810179 A EP 88810179A EP 88810179 A EP88810179 A EP 88810179A EP 0284565 B1 EP0284565 B1 EP 0284565B1
Authority
EP
European Patent Office
Prior art keywords
inductor
mold
mould
sides
narrow sides
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 - Lifetime
Application number
EP88810179A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0284565A1 (de
Inventor
Jean-Claude Weber
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
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 Alusuisse Lonza Services Ltd filed Critical Alusuisse Lonza Services Ltd
Priority to AT88810179T priority Critical patent/ATE56897T1/de
Publication of EP0284565A1 publication Critical patent/EP0284565A1/de
Application granted granted Critical
Publication of EP0284565B1 publication Critical patent/EP0284565B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/01—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces
    • B22D11/015—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces using magnetic field for conformation, i.e. the metal is not in contact with a mould

Definitions

  • the invention relates to an electromagnetic continuous casting mold for the vertical casting of rolled ingots with an essentially rectangular cross section with an inductor arranged on the four sides of the mold and an electromagnetic screen partially covering them.
  • a mold is known from EP A 0 109 357.
  • rolling ingot includes casting strands with essentially rectangular, i.e. Cross-sectional dimensions having broad or rolled sides and narrow sides understood.
  • heat is removed from the strand emerging from the mold by applying coolant to the surface of the strand directly below the mold.
  • the coolant initially only touches the start-up floor.
  • the indirect heat removal that occurs leads to a mild solidification of the liquid metal and to an even formation of the strand base.
  • the coolant hits the surface of the strand, which is associated with a sudden increase in heat dissipation from the strand.
  • the thermal stresses resulting from this temperature shock are greater than the tensile strength of the strand and lead to permanent deformation in the form of a convex curvature of the strand foot.
  • the cooling intensity can be reduced, for example, at least during the start-up process.
  • a coolant with gas dissolved in it is used, which forms an insulating film which reduces the heat flow when the coolant hits the surface of the strand.
  • a significant advantage of electromagnetic over conventional continuous casting molds lies in the more uniform formation of the strand surface, which is free from cold running, exudation, surface segregation and other near-surface defects, so that in most cases there is no need to mill the strand surface.
  • the electromagnetic force field generated by the inductor stimulates melt circulation in the liquid head of the strand.
  • This electromagnetic turbulence can, among other things, detach the oxide skin and consequently impair the solidification conditions and the melt quality in the area of the solidifying strand surface. This manifests itself, for example, in an accumulation of oxide inclusions, in longitudinal folds and in those surface defects which only appear in the form of surface slate, looper lines and the like in the processed material.
  • alloys with a strong tendency to oxidize such as e.g. B.
  • the inventor has set itself the goal of further developing an electromagnetic continuous casting mold of the type mentioned at the outset in such a way that the strands can be prevented from escaping during casting, while accepting a minimal melt circulation in the liquid head of the casting strand.
  • the screen is arranged or designed on the narrow sides of the mold in such a way that the electromagnetic force directed at the liquid head of the strand is greater on the narrow sides of the mold than on the broad sides thereof.
  • This measure increases the electromagnetic force directed towards the middle of the strand on the narrow sides of the mold, so that a certain strand root warping can be accepted without the risk of the strand running out on its narrow sides.
  • the casting process is therefore safer during the start-up process.
  • the melt circulation in the liquid head of the casting strand is only slightly increased.
  • the design of the mold according to the invention enables casting of large-sized rolled bars made of aluminum alloys with magnesium contents of 4% and more.
  • the vertical distance between the lower edge of the inductor and the lower edge of the screen is greater on the narrow sides of the mold than on the broad sides thereof.
  • the lower edges of the screen lie on the broad and narrow sides of the mold at the same height, the inductor being arranged higher on the broad sides of the mold than on its narrow sides.
  • the mere shift in the position of the inductor offers the part before that the line of incidence of the coolant usually determined by the inner surface of the electromagnetic screen on the strand circumference remains unchanged.
  • the inductor is arranged on the broad and narrow sides of the mold at the same height, the lower edges of the screen being higher on the narrow sides of the mold than on the broad sides thereof.
  • the difference between the vertical distance between the lower edge of the screen and the lower edge of the inductor on the broad sides compared to the vertical distance between the lower edge of the screen and the lower edge of the inductor on the narrow sides of the mold is preferably a maximum 70%, preferably 10 - 30%, of the vertical dimension of the inductor.
  • the screen has a different cross-section on the narrow sides of the mold or a different electrical conductivity than on the broad sides thereof.
  • inductor and electromagnetic shield naturally does not only relate to molds with a fixed casting cross-section, but is also particularly suitable for molds with a variable casting cross-section, i.e. for example for a mold with stationary side walls and sliding end walls, as is known for example from EP-A-0 109 357.
  • a mold 1 has a coolant box 2, to which a support body 4 made of electrically insulating material is fastened by means of screws 3.
  • This support body 4 is supported by a loop-shaped inductor 6, which is held by screws 5 and has a tubular cooling channel 7 on the back for receiving a coolant.
  • a downwardly tapering electromagnetic screen 9 made of an electrically conductive, non-ferromagnetic material is fastened by means of screws 8. Screen 9 and inductor 6 create a gap 10, from which coolant is passed from a coolant chamber 11 via a channel 12 to the surface of a casting strand (not shown in the figure).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Rehabilitation Tools (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Medicinal Preparation (AREA)
  • Confectionery (AREA)
EP88810179A 1987-03-23 1988-03-21 Elektromagnetische Stranggiesskokille Expired - Lifetime EP0284565B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810179T ATE56897T1 (de) 1987-03-23 1988-03-21 Elektromagnetische stranggiesskokille.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1095/87 1987-03-23
CH109587 1987-03-23

Publications (2)

Publication Number Publication Date
EP0284565A1 EP0284565A1 (de) 1988-09-28
EP0284565B1 true EP0284565B1 (de) 1990-09-26

Family

ID=4202353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810179A Expired - Lifetime EP0284565B1 (de) 1987-03-23 1988-03-21 Elektromagnetische Stranggiesskokille

Country Status (10)

Country Link
US (1) US4796689A (no)
EP (1) EP0284565B1 (no)
JP (1) JPS63252644A (no)
AT (1) ATE56897T1 (no)
AU (1) AU607748B2 (no)
CA (1) CA1315521C (no)
DE (1) DE3860676D1 (no)
ES (1) ES2018356B3 (no)
NO (1) NO168460C (no)
ZA (1) ZA881861B (no)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3041192A (en) * 1992-01-30 1993-08-05 Alusuisse-Lonza Services Ltd Electromagnetic continuous chill casting mould

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH625441A5 (no) * 1977-12-05 1981-09-30 Alusuisse
DE2914246C2 (de) * 1979-03-07 1981-11-12 Schweizerische Aluminium AG, 3965 Chippis Elektromagnetische Stranggießkokille
US4321959A (en) * 1979-07-11 1982-03-30 Olin Corporation Electromagnetic casting shape control by differential screening and inductor contouring
US4512386A (en) * 1982-11-12 1985-04-23 Swiss Aluminium Ltd. Adjustable mold for electromagnetic casting
US4544016A (en) * 1983-04-21 1985-10-01 Yetselev Zinovy N Continuous casting process and apparatus

Also Published As

Publication number Publication date
ZA881861B (en) 1988-09-05
DE3860676D1 (de) 1990-10-31
ES2018356B3 (es) 1991-04-01
JPS63252644A (ja) 1988-10-19
ATE56897T1 (de) 1990-10-15
AU607748B2 (en) 1991-03-14
EP0284565A1 (de) 1988-09-28
CA1315521C (en) 1993-04-06
NO881235L (no) 1988-09-26
US4796689A (en) 1989-01-10
AU1351388A (en) 1988-09-22
NO168460B (no) 1991-11-18
NO881235D0 (no) 1988-03-21
NO168460C (no) 1992-02-26

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