US3415306A - Method of continuous casting without applying tension to the strand - Google Patents

Method of continuous casting without applying tension to the strand Download PDF

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Publication number
US3415306A
US3415306A US474279A US47427965A US3415306A US 3415306 A US3415306 A US 3415306A US 474279 A US474279 A US 474279A US 47427965 A US47427965 A US 47427965A US 3415306 A US3415306 A US 3415306A
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United States
Prior art keywords
mould
strand
casting
metal
nozzle
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Expired - Lifetime
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US474279A
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English (en)
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Olsson Erik Allan
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Individual
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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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • This invention discloses a method for the continuous casting of metal wherein a nozzle for supplying molten metal is telescopically received into one end of an openended water-cooled casting mould.
  • the casting mould is reciprocated in the direction of its length during the process of casting, and as the mould moves forward, i.e., in the direction of the travel of the metal being cast, the partly-solidified casting in the mould travels forwardly with the mould.
  • the previously-cast metal in the mould recedes from the nozzle, fresh metal enters the mould on this forward stroke. It immediately solidifies around the interior wall of the mould.
  • this solidified ring of fresh metal interposed between the end of the nozzle and the previously-cast metal prevents the metal in the mould from traveling back with the mould, thereby effecting relative movement between the mould and the casting.
  • Rollers may be used on the casting outside the mould to apply a regulated opposing force to the free forward travel of the casting.
  • a method to manufacture end products and semi-fabricated products directly from a melt by supplying melt to a mould open in both ends and simultaneously withdrawing the casting at least partly solidified within the mould which casting is further cooled in order to wholly solidify, is previously known under the name of continuous casting. Hitherto the casting of the melt has taken place from a pouring box above the mould opening whereby of course the supply of melt and the withdrawing velocity of the strand must be suited to each other so that the metal level in the mould does not fall below or rise above the desired height. Too great an amount of melt in relation to the withdrawing velocity has the effect that the melt flows out over the upper edge of the mould.
  • a clearance between the supply tube and the mould which allows for the lubrication of the mould wall, and for the escape of steam and/ or gas occurring at the contact of the melt with the lubricant, with a reciprocating mould, and when such a clearance space is provided, the molten metal enters the clearance space and immediately solidifies by contacting the mould wall and contracts about the end of the nozzle.
  • the solidified metal in the clearance space then resists movement with the mould as the mould moves forward, being firmly attached to the nozzle, thus stressing the already formed skin of the metal, causing it to rupture.
  • the present invention relates to a method to reduce the drawing otf risk of pulling off the initially formed skin where a reciprocating mould is used wherein the partly solidified strand within the reciprocating mould moves together when the mould moves forward, but it prevented from moving back with the mould in the opposite or backward direction in the travel cycle. This is accomplished by so operating the mould that the hot metal entering the mould on its forward stroke is solidified forming a solidring against the mould wall between the nozzle and the earlier partly solidified strand portion, which prevents the strand from moving with the mould as the mould moves backwards.
  • 1 designates a pouring box on which a casting nozzle 2 is mounted so that it extends into the inlet end 4 of the mould 3.
  • the mould 3 is reciprocated axially from the position shown in the drawing at the forward limit of its travel rearwardly to the dot-and-dash line position, so that the end of the nozzle 2 telescopes or extends at all times into the mould during the casting operation.
  • Reciprocation of the mould is a common expedient in continuous casting, and known mechanism (not shown) may be used for this purpose.
  • the molten metal in the pouring box 1 fills the cavity in the mould and solidifies against the wall of the mould 3.
  • rollers 5 which are positioned to engage the casting at a point sufficiently removed from the mold to prevent distortion of the casting are used to withdraw the casting from the mold, as is usual in the art, tension is applied to the newlyforming portion of the casting, tending to elongate it and reduce its diameter so that the casting contracts away from the mold walls and does not have adequate heat transfer contact therewith.
  • rollers were used to pull the casting from the mold, and when the mold was moving toward the rollers, the mold travel was adjusted to the same speed as the linear speed at which the rollers advanced the casting, so there was then no relative movement between the solidifying metal in the mold and the mold walls.
  • the rollers 5 are not used as withdrawing means, but the strand is fed forward a distance corresponding to the feeding movement or forward stroke of the mould because of the friction between the strand skin and the mould wall.
  • a volume of fresh melt enters and fills the mould at the opposite end to a corresponding height or volume.
  • the freshly introduced melt solidifies rapidly along the mould wall so that on the back stroke of the mould the strand is prevented from accompanying the mould because the freshly formed skin at the inlet end of the mould acts as a spacer or thrust ring between the earlier solidified metal and the nozzle.
  • the strand is pressed out from the mould as the mould retracts and tension stresses are thus completely avoided.
  • the advancing of the strand is obtained by means of the friction of the metal against the forwardly-traveling mould wall and the strand.
  • the resistance against the forward movement does not become too high and thus it may be advantageous that the strand slopes somewhat relatively to the horizontal plane as shown.
  • the forward movement can be secured by using a tapering mould.
  • the inlet end of the mould has a smaller area than that of the outlet end in that the mould walls at the inlet end are slightly inwardly curved but at the outlet end 7 the walls are straight or have the shape which corresponds to the desired finished product. Under all circumstances the mould will move the strand forwardly a distance corresponding to the length of stroke of the mould.
  • the rollers 5 provide a support for the casting but they do not serve in any manner to draw the casting out of the mold. They are idler rollers to support the casting, except that they may resist turning too freely in the direction of forward travel of the casting so that they may prevent over-travel of the casting when it is being pushed from the mold.
  • This pushing in the nature of an extruding force in the present invention, is generated by the fact that when the mold is moving in a direction toward the rolls, a space is being opened between the metal in the mold and the end of the nozzle into which fresh melted metal instantly flows from the nozzle. This fresh metal almost instantly solidifies around the interior of the mold forming a ring between the nozzle and the previously-solidified metal in the mold.
  • the rollers can be adjusted to resist the gravitational pullto a point where the maximum travel of the strand is no greater than the forward stroke of the mold.
  • other means can be used for providing resistance against the free forward travel of the strand, but in no case should the arrangement be such as to exert a tension on the emerging strand.
  • the method according to the present invention may, under certain circumstances, with advantage be combined with a vibration of the mould and/ or the strand in order to reduce the sticking tendency of the melt to the mould wall, to reduce the friction and to obtain a finer grain structure in the cast product.
  • the only partly solidified strand must solidify completely after leaving the mould which can take place in a manner known per se, e.g., by water spraying, the strand being sprayed through nozzles 8 and supported and led through the spraying zone in any suitable way, e.g., between rollers 9 or by having the strand passing between cooling jaws resting against the strand. Under certain circumstances it can be advantageous to move the strand through a bed of a granular material, e.g., foundry sand as with other casting processes.
  • the strand manufactured in the above stated way can be processed as continuously cast metal formed in other processes is processed, that is, bent and straightened in desired directions in a manner known per se, e.g., by using a progressive bending, by winding of the strand onto a reel or in a spiral.
  • the strand can also be cut off in desired lengths, e.g., by gas cutting or shearing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Ropes Or Cables (AREA)
  • Casting Devices For Molds (AREA)
  • Adornments (AREA)
US474279A 1964-07-23 1965-07-23 Method of continuous casting without applying tension to the strand Expired - Lifetime US3415306A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8982/64A SE303353B ( ) 1964-07-23 1964-07-23

Publications (1)

Publication Number Publication Date
US3415306A true US3415306A (en) 1968-12-10

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Family Applications (1)

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US474279A Expired - Lifetime US3415306A (en) 1964-07-23 1965-07-23 Method of continuous casting without applying tension to the strand

Country Status (11)

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US (1) US3415306A ( )
AT (1) AT289310B ( )
BE (1) BE667324A ( )
DE (1) DE1483615A1 ( )
DK (1) DK112816B ( )
ES (1) ES315628A1 ( )
FI (2) FI45522C ( )
GB (1) GB1108167A ( )
LU (1) LU49151A1 ( )
NO (1) NO116380B ( )
SE (1) SE303353B ( )

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706336A (en) * 1970-01-30 1972-12-19 Technica Guss Gmbh Device for horizontal continuous casting of plates
US3709285A (en) * 1970-09-16 1973-01-09 Olsson E Ag Method and apparatus for guiding a continuous casting strand
US3857437A (en) * 1973-03-22 1974-12-31 Technicon Instr Method and apparatus for continuously casting metals
US4355679A (en) * 1978-02-18 1982-10-26 British Aluminum Company Limited Casting metals
US4453589A (en) * 1981-05-22 1984-06-12 Voest-Alpine Aktiengesellschaft Arrangement for continuously casting a metal strand
US5542466A (en) * 1994-03-28 1996-08-06 Didier-Werke Ag Method and device for the casting of molten material to nearly final intended dimensions by commencing solidification of molten material in a casting nozzle passage while moving the solidifying material through the passage by ultrasonic vibrations
US5799722A (en) * 1995-03-02 1998-09-01 Buziashvili; Boris Method and apparatus for continuous metal casting
US6523601B1 (en) 2001-08-31 2003-02-25 Shlomo Hury Method and apparatus for improving internal quality of continuously cast steel sections

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1208060B (it) * 1981-01-27 1989-06-06 Danieli Off Mecc Dispositivo di partenza nellemacchine per colata continua.
AT373178B (de) * 1982-04-20 1983-12-27 Voest Alpine Ag Horizontalstranggiessanlage zum kontinuierlichen giessen eines stranges mit brammenquerschnitts- format

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1088171A (en) * 1913-01-30 1914-02-24 Adam Helmer Pehrson Manufacture of bar and tube shaped articles from molten metal.
US2740177A (en) * 1953-07-21 1956-04-03 American Smelting Refining Continuous metal casting process
US2891294A (en) * 1955-07-28 1959-06-23 Thyssen Huette Ag Process and apparatus for casting elongated slender lengths of metal
US3045299A (en) * 1959-11-17 1962-07-24 Steigerwald Karl Heinz Reciprocating mold using a vacuum and pressure assist
GB908902A (en) * 1960-02-24 1962-10-24 United Steel Companies Ltd Improvements relating to nozzles for continuously casting metals
US3290734A (en) * 1963-05-25 1966-12-13 Alfred J Wertli Apparatus for horizontal, continuous metal casting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1088171A (en) * 1913-01-30 1914-02-24 Adam Helmer Pehrson Manufacture of bar and tube shaped articles from molten metal.
US2740177A (en) * 1953-07-21 1956-04-03 American Smelting Refining Continuous metal casting process
US2891294A (en) * 1955-07-28 1959-06-23 Thyssen Huette Ag Process and apparatus for casting elongated slender lengths of metal
US3045299A (en) * 1959-11-17 1962-07-24 Steigerwald Karl Heinz Reciprocating mold using a vacuum and pressure assist
GB908902A (en) * 1960-02-24 1962-10-24 United Steel Companies Ltd Improvements relating to nozzles for continuously casting metals
US3290734A (en) * 1963-05-25 1966-12-13 Alfred J Wertli Apparatus for horizontal, continuous metal casting

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3706336A (en) * 1970-01-30 1972-12-19 Technica Guss Gmbh Device for horizontal continuous casting of plates
US3709285A (en) * 1970-09-16 1973-01-09 Olsson E Ag Method and apparatus for guiding a continuous casting strand
US3857437A (en) * 1973-03-22 1974-12-31 Technicon Instr Method and apparatus for continuously casting metals
US4355679A (en) * 1978-02-18 1982-10-26 British Aluminum Company Limited Casting metals
US4453589A (en) * 1981-05-22 1984-06-12 Voest-Alpine Aktiengesellschaft Arrangement for continuously casting a metal strand
US5542466A (en) * 1994-03-28 1996-08-06 Didier-Werke Ag Method and device for the casting of molten material to nearly final intended dimensions by commencing solidification of molten material in a casting nozzle passage while moving the solidifying material through the passage by ultrasonic vibrations
US5799722A (en) * 1995-03-02 1998-09-01 Buziashvili; Boris Method and apparatus for continuous metal casting
US6523601B1 (en) 2001-08-31 2003-02-25 Shlomo Hury Method and apparatus for improving internal quality of continuously cast steel sections

Also Published As

Publication number Publication date
DK112816B (da) 1969-01-20
BE667324A ( ) 1965-11-16
NO116380B ( ) 1969-03-17
LU49151A1 ( ) 1965-09-23
SE303353B ( ) 1968-08-26
DE1483615A1 (de) 1970-02-19
ES315628A1 (es) 1965-12-01
FI45522B ( ) 1972-04-04
AT289310B (de) 1971-04-13
GB1108167A (en) 1968-04-03
FI45522C (fi) 1972-07-10

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