US3687190A - Method of regulating the supply of molten metal to a casting cavity - Google Patents

Method of regulating the supply of molten metal to a casting cavity Download PDF

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Publication number
US3687190A
US3687190A US66045A US3687190DA US3687190A US 3687190 A US3687190 A US 3687190A US 66045 A US66045 A US 66045A US 3687190D A US3687190D A US 3687190DA US 3687190 A US3687190 A US 3687190A
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molten metal
outlet
supply
cavity
conduit
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Expired - Lifetime
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US66045A
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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
    • B22D11/064—Accessories therefor for supplying molten metal

Definitions

  • the present invention generally relates to continuous metal casting, and more particularly to a method for the continuous casting of metal rods and similar bodies. Still more particularly, the present invention relates to the self-repelation of the molten-metal feed in such a continuous casting method.
  • the problem is how to feed molten metal into the casting cavity in such a way as to prevent the overflow of metal, that is to avoid feeding molten metal at an excessively high rate, while at the same time assuring that the metal is fed at a rate adequate to fill the cavity so as to obtain the desired product.
  • the present invention thus has for its primary object to overcome the disadvantages known from the prior art and to provide for automatic regulation of the feed of additional molten metal into the casting cavity.
  • the present invention has as one above-enumerated purposes.
  • I utilize a continuous casting machine having a rotatable casting wheel and a metallic tape.
  • the casting wheel has an outwardly directed circumferential edge face provided with a circumferential groove and the metal tape extends partly around this edge face and covers this groove over a portion of arc to define therewith a cavity which is adapted to receive molten metal.
  • Cooling means is associated with the wheel for cooling and thereby solidifying the molten metal in the cavity.
  • Supply means is provided for molten metal, such supply means being associated with the wheel and in accordance with my invention being operative for discharging additional molten metal into the cavity below the level of molten metal already contained therein, and at a rate which is a function of the flow resistance opposed to such discharge by the molten metal contained in the cavity.
  • the feed or supply of molten metal is automatically self-regulated by making use of the relationship between the outlet or feeding nozzle in the casting cavity and the initial solidification environment of the metal already contained in the cavity.
  • FIG. 1 is a partly sectioned diagrammatic elevation of a machine capable of carrying out my invention
  • FIG. 2 is a detail view, in section, of a portion of FIG.
  • FIG. 3 is a section taken on the line IIIIII of FIG. 2;
  • FIG. 4 is a section taken on the line IV-IV of FIG. 2;
  • FIG. 5 is a section taken on the line VV of FIG. 2.
  • FIG. 1 The continuous casting machine illustrated in FIG. 1 is capable of carrying out my method and is drawn to facilitate its explanation; this machine corresponds substantially to the machine which is for instance disclosed in my US. Pat. No. 3,346,038 which contains a detailed description of such a machine.
  • the machine essentially comprises a frame which supports a continuous casting wheel 11 which is rotatable in the direction of the arrow 12 via a prime mover which is not illustrated.
  • the wheel 11 is provided along its periphery, or more specifically in its outwardly directed circumferential edge face with a groove or casting cavity 14 of generally polygonal cross-sectional configuration.
  • the cross-section of the groove 14 is mentioned by way of example only inasmuch as it does not constitute a part of the present invention.
  • the groove 14 is closed by a continuous metal tape 15 overlying the groove
  • Rotary pulley means of conventional type more specifically discussed in my aforementioned U.S. Pat. No. 3,346,038, are provided for driving the tape 15.
  • Such pulleys are identified with numerals 18 and 19 and are rotatable in the direction of the arrows 20. They are supported by a suitable support, generally identified with reference numeral 21.
  • the wheel 11 is cooled from inside and from outside by means of jets of cooling liquid 22 and 23. How this is accomplished is also described more fully in my aforementioned U.S. Patent, and forms no part of the present invention.
  • the tape 15 is deflected into tight engagement with the peripheral surface of the wheel 11 by a tape presser roller 24 provided at the point 16.
  • Molten metal is fed into the casting cavity constituted by the enclosed portion of the groove 14 and is conveyed by rotation of the wheel 11 and simultaneously cooled so that it solidifies and issues at the point 17, where the tape uncovers the groove, in form of a rod or wire 25.
  • Molten metal introduced into the casting cavity in the region of the inlet end 16 thereof will form a level 29 in the cavity.
  • the manner in which this solidification occurs is characteristic and is shown in FIG. 1 and more clearly still in FIG. 2. It will be seen that solidification begins in the areas of contact with the walls of the groove and the tape 15 so that the metal solidifies in direction inwardly away from the walls.
  • the molten metal 26, that is the supply of additional molten metal, is fed from a melting furnace (not shown) in a continuous flow to a crucible or supply vessel 27 and issues therefrom through an outlet duct 28 into the casting chamber so as to maintain the level 29 therein.
  • a melting furnace not shown
  • the body of molten metal in supply vessel 27 at any given moment will generally have an uppermost level above the level of the outlet of conduit 28.
  • the crucible 27 is fastened to a supporting arm 30 which is movable vertically along an upright guide 31.
  • the supporting arm 30 is provided with a projection which engages in a dove-tail-shaped groove 32 formed in the upright guide 31.
  • the projection of the supporting arm 30 is provided with a screwthreaded perforation (not illustrated) which cooperates with a screw-threaded shaft 33, the latter being provided at its top portion with an integral worm gear 34 which engages a horizontally positioned worm 35.
  • the latter is actuated by an electric motor 36 affixed to the shaft of the worm 35.
  • FIG. 1 shows that the crucible 27, which contains the molten metal 26 therein is provided with a manually operable adjusting device comprising a rod 37 which can be manually actuated via a lever 38.
  • the rod 37 is movable into and out of the inlet end of the duct 28 so as to increase or decrease the cross-sectional area of this inlet end and thereby throttle the flow of molten metal into the duct 28 to the extent desired.
  • the outlet end of the duct 28 is located, as evident from FIGS. 1 and 2, below the level 29 of the molten metal 26 contained in the cavity constituted by the groove 14 and the tape 15. Additional molten metal issuing from the outlet end of the conduit 28 follows the path indicated by the arrow 40 in FIG. 2, that is it must issue against the resistance offered to it by the molten metal forming the pool in the casting cavity, and it must rise upwardly in this pool in the direction indicated by the arrow 40.
  • the motor 36 is actuated whereby the crucible 27 and therefore the outlet of the conduit 28 are preset at a desired height which can be readily determined empirically.
  • conduit 28 conveys molten metal under pressure, the pressure in this case being that due to the upper metal part contained in supply vessel 27.
  • a further adjustment is effected, if necessary and desired, via the rod 37.
  • the flow of molten metal 26 from the crucible into the casting cavity will adjust itself automatically in accordance with the central concept of my invention as a function of the flow resistance offered by the mass or pool of molten metal confined within the conical wrapper 39 to the discharge of new molten metal from the outlet end of the conduit 28.
  • the method is based on the operation of a type of valve whose adjustable member is constituted by the pool of molten metal defined by the conical wrapper 39. It is clear that any need for movable components contacting the molten metal in the casting cavity is eliminated, and it is further clear that the regulatory action provided is proportional to the variation which is obtained in the filling level and that such variation will invariably elicit a prompt response in terms of changes in the inflow of additional molten metal. It is important to note that, if the filling level is lowered, the same is true also of the conical pool located within the solidified metal wrapper 39, so that the throttled outflow passageway or flow clearance is enlarged.
  • a raising of the filling level tends to raise the position of the solidified portion and results in automatic throttling of the outflow of additional molten metal from the conduit 28.
  • the diameter of the casting wheel may range between approximately 140 and 200 centimeters and the length of the portion of conduit 28 which is immersed in the cavity may reach a maximum of -25 centimeters so as to effect positioning of the outflow of the conduit 28 within the pool of molten metal bounded by the wrapper 39.
  • the most convenient throttling weight and flow can of course be obtained empirically in a simple manner and it will be obvious that the length of the immersed portion of the conduit 28 will constitute a function of the inside diameter of the conduit also. As the latter is increased, the length of the immersed portion is decreased if the same throttling of material fiow is to be maintained.
  • FIGS. 3 which are sections taken on the indicated section lines of FIG. 2, are self-explanatory and require no detailed discussion.
  • a method of regulating the supply of molten metal to a casting cavity comprising the steps of admitting molten metal at an upstream portion of a travelling casting cavity for solidification and withdrawal therefrom at a downstream portion, so that the molten metal is present in said cavity in the region of said upstream portion in a liquid and a solid phase an interface between which changes its position in dependence upon the rate of supply of molten metal into and the rate of withdrawal of solidified metal from said cavity; positioning an outlet for molten metal within said upstream portion of said cavity in said liquid phase proximal to said interface so as to define therewith a flow clearance having an efiective cross-section which increases and decreases in dependence upon the changes of position of said interface; and admitting additional molten metal into said cavity and liquid phase through said outlet and clearance, whereby the rate supply of such additional molten metal will vary with variations in said fiowpath cross-section, and accordingly in dependence upon said rates of supply and withdrawal.
  • outlet being the outlet of a conduit which communicates with a supply vessel adapted to contain a supply of molten metal, and the molten metal in said supply vessel having an uppermost level above the level of said outlet; and further comprising the step of varying the vertical distance from said uppermost level to said outlet.
  • outlet being the outlet of a conduit which communicates with a supply vessel adapted to contain a supply of molten metal, and the molten metal in said supply vessel having an uppermost level above the level of said outlet, and said liquid phase having an upper boundary surface spaced from said interface and above said outlet; and further comprising the step of varying the vertical distance from said uppermost level to said upper boundary surface.
  • outlet being the outlet of a conduit which communicates with a source of molten metal, said conduit having an effective cross-sectional area; and further comprising the step of varying the effective cross-sectional area of said conduit.
  • said interface comprising a conical surface defining a conical hollow filled with molten metal and projecting into said solid phase, and wherein the step of positioning said outlet proximal to said interface comprises positioning said outlet within said conical hollow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
US66045A 1967-03-15 1970-08-21 Method of regulating the supply of molten metal to a casting cavity Expired - Lifetime US3687190A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1377467 1967-03-15

Publications (1)

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US3687190A true US3687190A (en) 1972-08-29

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ID=11144641

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US66045A Expired - Lifetime US3687190A (en) 1967-03-15 1970-08-21 Method of regulating the supply of molten metal to a casting cavity

Country Status (8)

Country Link
US (1) US3687190A (de)
AT (1) AT278268B (de)
BE (1) BE709316A (de)
CH (1) CH470222A (de)
CS (1) CS165993B2 (de)
DE (1) DE1608077C2 (de)
NL (1) NL6800857A (de)
SE (1) SE333219B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903954A (en) * 1971-08-31 1975-09-09 Southwire Co Apparatus for pouring molten metal

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659948A (en) * 1950-01-21 1953-11-24 Properzi Ilario Machine for the continuous casting of metal rods
US2683294A (en) * 1949-05-28 1954-07-13 Aluminum Co Of America Metal transfer method and apparatus
US3326271A (en) * 1966-08-04 1967-06-20 Southwire Co Casting wheel with band positioning device
US3331431A (en) * 1966-04-06 1967-07-18 Sonthwire Company Vessel positioning apparatus
US3333629A (en) * 1966-07-18 1967-08-01 Southwire Co Casting wheel cooling apparatus
US3333624A (en) * 1966-06-20 1967-08-01 Southwire Co Casting wheel cooling method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140675B (de) * 1957-10-14 1962-12-06 Rheinstahl Eisenwerke Gelsenki Zufuehrungsgefaess zum selbsttaetigen Zufuehren des Giesswerkstoffes beim Stranggiessen
GB897803A (en) * 1959-11-25 1962-05-30 Ilario Properzi Improvements in or relating to apparatus for continuously casting metal rods

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683294A (en) * 1949-05-28 1954-07-13 Aluminum Co Of America Metal transfer method and apparatus
US2659948A (en) * 1950-01-21 1953-11-24 Properzi Ilario Machine for the continuous casting of metal rods
US3331431A (en) * 1966-04-06 1967-07-18 Sonthwire Company Vessel positioning apparatus
US3333624A (en) * 1966-06-20 1967-08-01 Southwire Co Casting wheel cooling method
US3333629A (en) * 1966-07-18 1967-08-01 Southwire Co Casting wheel cooling apparatus
US3326271A (en) * 1966-08-04 1967-06-20 Southwire Co Casting wheel with band positioning device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903954A (en) * 1971-08-31 1975-09-09 Southwire Co Apparatus for pouring molten metal

Also Published As

Publication number Publication date
NL6800857A (de) 1968-09-16
AT278268B (de) 1970-01-26
DE1608077C2 (de) 1973-01-04
SE333219B (sv) 1971-03-08
BE709316A (de) 1968-05-16
CS165993B2 (de) 1975-12-22
CH470222A (it) 1969-03-31
DE1608077B1 (de) 1972-05-31

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