US3529658A - Continuous casting wheel with improved cooling arrangement - Google Patents

Continuous casting wheel with improved cooling arrangement Download PDF

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Publication number
US3529658A
US3529658A US696312A US3529658DA US3529658A US 3529658 A US3529658 A US 3529658A US 696312 A US696312 A US 696312A US 3529658D A US3529658D A US 3529658DA US 3529658 A US3529658 A US 3529658A
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Prior art keywords
mould
wheel
cooling
ingot
continuous casting
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Expired - Lifetime
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US696312A
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English (en)
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Ilario Properzi
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    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels

Definitions

  • the casting wheel is a turning wheel provided with a flexibly mounted grooved periphery or mould, with a metal tape arrange to cover an arc portion of said groove and cooperating with a water jet cooling system designed to cool the walls of said groove and said tape. Molten metal is loaded into said groove at the beginning of the portion covered by said tape and leaves the latter in solid ingot or bar form.
  • the present invention relates to an improved grooved ring or casting mould peripherally carried by casting wheel in a continuous casting machine.
  • the continuous casting machine for producing continuous metal bars essentially comprises a turning wheel peripherally provided with a groove or casting mould of section equal to the section of the ingot to be cast. Said groove is covered along a certain portion of arc by a metal tape which closes the corresponding portion of groove to retain therein the metal which, entering the groove in liquid or molten state at the beginning of said closed portion, leaves the covered portion of said groove in the form of a solid continuous bar or ingot.
  • Unbalanced cooling of the molten metal will result in a defective ingot structure, the ingot being subject to crystallization malformations, segregations, cracks, surface roughness and brittleness etc. and these defects become more noticeable according to increase of the ingot section.
  • a continuous casting apparatus includes a disc-shaped inner flange concentrically sup- 3,529,658 Patented Sept. 22, 1970 ported at the end of a rotatable shaft, an annular casting wheel clamped to the front face of the inner flange by a spring loaded outer flange which is designed to allow the casting wheel to expand and contract with thermal changes.
  • the casting wheel is provided with a partially covered peripheral groove or mould adapted to receive the molten metal and a water jet arrangement is provided to cool the inner, the side and the covered portions of the mould.
  • An important object of the invention is that of providing a grooved mould which is mounted and formed in manner such as to be free to expand and contract according to the insertion of molten metal to be cast and its contraction due to the cooling, walls of the groove thus being arranged to remain in constant contact with the ingot to be cast during all stages of its formation.
  • a further object of the invention is that of providing a grooved ring or mould which expands automatically and elastically in an extremely short time by means of elastic connections of the edges of the groove with the rigid parts of the wheel.
  • a further object is that of producing ingots by wheel casting of the described type which are perfectly smooth, shiny and perfectly formed.
  • a continuous ingot casting apparatus with a rotable casting wheel, a continuous grooved mould peripherally provided on said wheel for receiving molten metal, a metal tape arranged to cover an arc portion of said grooved mould, one end of said are portion corresponding to the molten metal inlet point and the other end thereof corresponding to the outlet point of solid ingot, cooling means arranged for the cooling of said tape and the walls of said grooved mould, wherein according to the improvement said grooved mould has an M-like cross-section defining a central trough-like portion receiving the cast metal and two arms on both sides of the trough-like portion, said arms having one end connected with an upper portion of said trough-like portion of the mould and a free end portion spaced from said trough-like portion thereby defining between said trough-like portion and the respective arm an interspace on each side of said troughlike portion, clamp means rigid with said wheel being provided to clamp said free end portions of the mould in a point substantially distant from said one end
  • FIG. 1 is a front elevational view of a continuous casting machine, and shows the feeding system for the tape covered peripheral groove of the turning or casting wheel,
  • FIG. 2 shows a sectional view of the turning wheel of the casting machine of FIG. 1,
  • FIG. 3 shows a sectional view of the grooved ring or mould (full of molten metal) in phase of expansion at a point near to the filling level
  • FIG. 4 shows a section of the grooved ring of FIG. 3 with an ingot already in solid state in a low point of the turning wheel.
  • FIG. 1 shows an elevational view of a continuous casting machine with a turning wheel 1 in which a peripheral groove 2 is fed with molten metal through the nozzle 3 extending from a feeding crucible 4 which is fed by the normal known means (not shown).
  • the groove 2 and the tape 7 are cooled internally and externally, respectively, by a series of water jets 5 and 6 for the mould and for the tape respectively.
  • the tape 7 encloses an arcuate portion of the groove 2 from the point in which it is controlled by the roller 8 to the point in which the solid ingot 10 leaves the wheel.
  • the tape 7 is maintained in constant tension by devices which act on the pulley 11.
  • the device 12 allows the lower point of the nozzle 3 to be adjusted below the filling level 13.
  • FIG. 2 shows a section of the casting wheel comprising a rotation shaft 14 which terminates with a sturdy flange 15.
  • a disc 16 is secured to said flange and forms the revolving part of the wheel, which is set in motion by a gear 17 actuated by a pinion 18 which is set in motion by a shaft 19 of a motor (not shown).
  • the cooling liquid comes from a tube 21 which, through a manifold 22 and tubes 23 and 24, feeds a manifold 25 intended to feed a series of jets 26.
  • FIG. 3 shows a section of the grooved ring full of liquid or molten metal in a point near the filling level.
  • Reference numeral 20 indicates the section of the ring secured to the disc 16 by means of a counter-ring 29.
  • Said counter-ring 29 (secured to the disc 16 by means of bolts 30) is provided with slits or apertures 31 through which jets of water may be sprayed onto the inner surface of the grooved ring 20.
  • Said grooved ring 20 is formed by said cavity that is that part of the walls which is in direct contact with the molten metal by the edges 32 and 33 on which the closure tape 7 is supported and by the edges 34 and 35 which are folded towards the centre of rotation so as to form the closure surface of the mould between the disc 16, the counter disc 29 and the ring members 36 and 37.
  • Reference numerals 38 and 39 indicate some locking bolts of the mould.
  • the desired expansion depends upon the thickness of the walls of the mould, the metal to be cast and is in ratio to the ingot section and the respective specific heats. Such expansion of the mould must therefore be obtained as a result of the heat given out as the metal passes from its liquid state temperature to its solid state temperature, that is to say its latent heat of fusion.
  • the latent heat of fusion of a metal is generally defined as the heat absorbed by 1 kg. of the metal during its passage from a solid at its fusion temperature to a liquid at the same temperature. This quantity of thermic energy is given out by the metal as it solidifies.
  • the latent heat of fusion is about 93 calories per kilogram.
  • a considerable amount of heat may thus be provided for the rapid expansion of the mould and this establishes a ratio between the ingot section and the thickness of the mould walls according to the desired expansion and the expansion rapidity.
  • the copper ensures a rapid heat transmission and it is assumed that the copper has an average specific heat of 0.1 calorie kilogram degree centigrade.
  • a segment of such an ingot of aluminium of 1 cm. thickness has a Weight of about gm. This segment will give out from the moulding temperature of about 700 C. to the solidification temperature of 658 C. a total of about 7 calories. But considering that it is desirable to obtain an expansion of the mould when a good deal of the metal still remains in liquid state it may be assumed that only 3 calories are available.
  • the hourly production of the machine depends upon the thermic energy which may be transferred to the cooling liquid through the walls of the mould. If these walls are thin, the required expansion is rapidly obtained.
  • the groove is thus such as to receive a greater quanity of metal and thus permits contact with the ingot throughout the cooling phase since when the ingot cools and shrinks a corresponding contraction of the cavity occurs.
  • the construction of the mould must also be such as to allow the rhythmic expansion and contraction in elastic manner and this occurs by means which will hereinafter be described to avoid permanent deformation of the mould.
  • This method of moulding produces an ingot which is perfectly formed and which has perfectly smooth surfaces. This is due to the intense heat exchange ensured by the uninterrupted contact between the ingot and the mould and the minimal thickness of the walls of the mould. This method also allows high productions to be obtained with rings of relatively small diameter which is extremely economically advantageous since the rings are the most expensive members of the process.
  • the resultant increase of volume of the groove is automatic and controlled because when the contraction of the mould occurs during the successive cooling phase such volume must return to its initial position.
  • FIG. 4 a solid ingot 42 may be seen in the mould which has returned to its initial position due to the ring members 36 and 37 which are fast with the rigid parts of the wheel.
  • a continuous ingot casting apparatus with a rotatable casting wheel, a continuous grooved mould peripherally provided on said wheel for receiving molten metal, a metal tape arranged to cover an arc portion of said grooved mould, one end of said are portion corresponding to the molten metal inlet point and the other end thereof corresponding to the outlet point of solid ingot, cooling means arranged for the cooling of said tape and the walls of said grooved mould, wherein, according to the improvement, said grooved mould has an M-like crosssection defining a central trough-like portion, receiving the cast metal and two arms on both sides of the troughlike portion, said arms having one end connected with an upper portion of said trough-like portion of the mould and a free end portion spaced from said trough-like portion thereby defining between said trough-like portion and the respective arm an interspace on each side of said trough-like portion, clamp means rigid with said wheel being provided to clamp said free end portions of the mould in a point substantially distant from said one end of said arms connected with

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US696312A 1967-10-21 1968-01-08 Continuous casting wheel with improved cooling arrangement Expired - Lifetime US3529658A (en)

Applications Claiming Priority (1)

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IT2187567 1967-10-21

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US3529658A true US3529658A (en) 1970-09-22

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US696312A Expired - Lifetime US3529658A (en) 1967-10-21 1968-01-08 Continuous casting wheel with improved cooling arrangement

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US (1) US3529658A (de)
AT (1) AT292219B (de)
BE (1) BE722500A (de)
CH (1) CH470923A (de)
DE (1) DE1783041B1 (de)
FR (1) FR1587139A (de)
GB (1) GB1215853A (de)
NL (1) NL6813300A (de)
SE (1) SE329697B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596705A (en) * 1970-01-28 1971-08-03 Southwire Co Long band life wheel-band casting machine
US3667537A (en) * 1968-12-30 1972-06-06 Spidem Ste Nle Cooling device for a continuous-casting wheel
US3746072A (en) * 1971-01-20 1973-07-17 Southwire Co Method of pouring molten metal
US3903954A (en) * 1971-08-31 1975-09-09 Southwire Co Apparatus for pouring molten metal
US3916984A (en) * 1971-03-29 1975-11-04 Ilario Properzi Cooling device for continuous casting machines
US4008753A (en) * 1973-10-22 1977-02-22 Giulio Properzi Continuous casting machine of the wheel and band type
US4957155A (en) * 1988-08-04 1990-09-18 Zdenek Trnka Cooling system for continuous casting machines
US20030102105A1 (en) * 2001-12-04 2003-06-05 Giulio Properzi Apparatus for producing ingots of nonferrous metals by continuous casting
CN105328148A (zh) * 2015-12-15 2016-02-17 德阳九鼎智远知识产权运营有限公司 可维护的结晶轮装配结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785428A (en) * 1972-03-02 1974-01-15 Hazelett Strip Casting Corp Wheel-belt continuous casting machine
US3818972A (en) * 1972-10-05 1974-06-25 Southwire Co Cast bar draft angle
FR2412370A1 (fr) * 1977-12-22 1979-07-20 Pechiney Aluminium Anneau pour roue de machine de coulee

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749584A (en) * 1952-01-22 1956-06-12 Nichols Wire & Aluminum Co Continuous casting apparatus
US2865067A (en) * 1957-02-06 1958-12-23 Properzi Ilario Continuous casting machine
US3346038A (en) * 1963-07-13 1967-10-10 Properzi Ilario Continuous casting wheel, with improved cooling device
US3416594A (en) * 1965-02-02 1968-12-17 Alusuisse Rotary continuous casting machine having resiliently movable sidewalls

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749584A (en) * 1952-01-22 1956-06-12 Nichols Wire & Aluminum Co Continuous casting apparatus
US2865067A (en) * 1957-02-06 1958-12-23 Properzi Ilario Continuous casting machine
US3346038A (en) * 1963-07-13 1967-10-10 Properzi Ilario Continuous casting wheel, with improved cooling device
US3416594A (en) * 1965-02-02 1968-12-17 Alusuisse Rotary continuous casting machine having resiliently movable sidewalls

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3667537A (en) * 1968-12-30 1972-06-06 Spidem Ste Nle Cooling device for a continuous-casting wheel
US3596705A (en) * 1970-01-28 1971-08-03 Southwire Co Long band life wheel-band casting machine
US3746072A (en) * 1971-01-20 1973-07-17 Southwire Co Method of pouring molten metal
US3916984A (en) * 1971-03-29 1975-11-04 Ilario Properzi Cooling device for continuous casting machines
US3903954A (en) * 1971-08-31 1975-09-09 Southwire Co Apparatus for pouring molten metal
US4008753A (en) * 1973-10-22 1977-02-22 Giulio Properzi Continuous casting machine of the wheel and band type
US4957155A (en) * 1988-08-04 1990-09-18 Zdenek Trnka Cooling system for continuous casting machines
US20030102105A1 (en) * 2001-12-04 2003-06-05 Giulio Properzi Apparatus for producing ingots of nonferrous metals by continuous casting
US20050022960A1 (en) * 2001-12-04 2005-02-03 Giulio Properzi Method for producing ingots of nonferrous metals by continuous casting
CN105328148A (zh) * 2015-12-15 2016-02-17 德阳九鼎智远知识产权运营有限公司 可维护的结晶轮装配结构

Also Published As

Publication number Publication date
BE722500A (de) 1969-04-01
DE1783041B1 (de) 1971-04-15
SE329697B (de) 1970-10-19
FR1587139A (de) 1970-03-13
GB1215853A (en) 1970-12-16
CH470923A (de) 1969-04-15
AT292219B (de) 1971-08-25
NL6813300A (de) 1969-04-23

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