US3542115A - Continuous-casting method - Google Patents

Continuous-casting method Download PDF

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Publication number
US3542115A
US3542115A US693430A US3542115DA US3542115A US 3542115 A US3542115 A US 3542115A US 693430 A US693430 A US 693430A US 3542115D A US3542115D A US 3542115DA US 3542115 A US3542115 A US 3542115A
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United States
Prior art keywords
strand
mold
guide path
horizontal guide
along
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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
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US693430A
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English (en)
Inventor
Irving Rossi
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SMS Concast Inc
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Concast Inc
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Publication date
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Publication of US3542115A publication Critical patent/US3542115A/en
Assigned to SMS CONCAST INC. reassignment SMS CONCAST INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 08/08/1984 Assignors: CONCAST INCORPORATED
Assigned to SMS CONCAST INC. reassignment SMS CONCAST INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: CONCAST INCORPORATED
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal

Definitions

  • Patented Nov. 24, 1970 INVENTOR IRVING ROSSI r CONTINUOUS-CASTING METHOD cooled) which solidifies the periphery of the metal in the mold to form a strand having a solidified skin and a still molten core.
  • the strand emerges from the lower end of the mold and is further cooled to complete solidification after which it is worked and/or cut into desired lengths.
  • Additional molten metal is continuously poured in the upper-end'of the mold to replace the metal withdrawn in the strand during a casting run.
  • the mold is usually oscillated generally along its axis to facilitate mold release andto increase casting rate.
  • the strand emerges from the lower, exit, end of the mold in a downward direction. It is known to conduct the strand along a'curved guide path from the mold and then straighten the strand to travel in a horizontal path in order to reduce the height of the apparatus required, and to cut, or otherwise work, the strand in a horizontal position, which is more economical and convenient than a vertical position. It is also known to use a curved mold to cast the strand in a curve compatible with the curved path it follows from the mold, and the curved molds are customarily oscillated in an arc corresponding to the radius of curvature of the mold or the path.
  • the strand is withdrawn from the mold by withdrawal rolls engaging aportion of the strand which is completely or almost completely solidified, because it has been felt that considerable pressure must be applied to draw the strand out of the mold and to move it far enough along a curved guide path past a sequence of cooling devices for it to be solidified sufficiently so as not to be distorted by the pressure applied by the withdrawal rolls. It is therefore conventional practice to apply cooling devices,
  • the withdrawal rolls are thus customarily located along the first portion of the horizontal guide path orat the lower end of the curved guide path.
  • the casting speed is limited to the rate at which the strand can be sufficiently solidified to withstand the pressure of conventional withdrawal rolls, without being distorted by them, when the strand reaches the rolls.
  • the use of withdrawal rolls in the conventional manner applies tension to the newly formed portion of the strand which is only partially solidified. This tension is thus apt to break the strand or to produce undesired stresses and strains in it.
  • a further disadvantage of conventional methods and apparatus for withdrawing the strand from the mold isthat solidification of the strand has progressed so far when the su fficient'depending on the degree to which friction is reduced along the-guide path which conducts the strand down and away from the mold--to draw the strand out of the mold, with perhaps the application of some additional moving force.
  • Another object is to provide a method in which the strand is straightened onto a horizontal guide path without having to apply external straightening forces, which would tend to produce undesired stresses and strains in the strand.
  • Still another object is to provide a method which enables a strand to be cast at higher speeds than by conventional methods or with conventional apparatus.
  • a further object is to provide a casting method which can be performed with simpler, less expensive apparatus than conventional methods.
  • a control force suitably a pair of driven rolls, is applied to the strand close to the point at which it emerges from the mold, to assure the movement of the strand down a curved guide path to a horizontal guide'path.
  • the force necessary to remove the strand from the mold and conduct it down a curved guide path has been overestimated in the art. Consequently, the pressure of the control force on the strand may be much less than the pressure applied by conventional withdrawal rolls and can be applied to the strand, almost as soon as it emerges from the mold and while the skin around the molten core is relatively thin, without permanently damaging or appreciably distorting the strand.
  • the strand travelling down the curved guide path to the horizontal guide path is cooled to the extent necessary to keep the skin from being remelted by the core but not enough to solidify the'coreto an extent that the strand becomes rigid.
  • the strand reaches the horizontal guide path it is relatively limp and straightens out along the horizontal guide path by its own weight, after which it is further cooled to complete solidification. In this way the sue of expensive As shown, molten metal from a conventional source, in-
  • a dicated by the outlet 10 of a tundish is poured in the upper end of a conventional continuously cooled, open ended chill mold 11, in which the periphery of the metal iscooled to form a strand 12 having a solidified skin 12a and a molten core 12b.
  • the mold 11 may have either a straight or curved mold cavity and in either case may be oscillated as in known continuous casting apparatus.
  • the periphery of the metal forming the skin 12a of the strand in the mold, shrinks away from the walls of the mold.
  • the strand 12 then emerges from the lower, exit, end of the mold, which is suitably provided with guide rolls 13 at opposite edges to guide the strand out the end of the mold.
  • a control force suitably providedby a pair .of driven control rolls 14 hearing against opposite sides of the strand 12, is applied at a position close to the exit end of themold and between the exit end and the upper portion of a curved guide path 15 for the strand.
  • the force forwithdrawing the strand from the mold may be considerably less than heretofore believed necessary. Consequently, the control rolls 14 operate with a relatively. light pressure on the strand so as not to distort it, the portion of the strand at the control rolls 14 having a molten core 12b within the solidified skin.
  • the purpose of the control rolls 14 is twofold: one, toapply to the strand 12 whatever slight degree of force may be necessary to assist its movement out of the mold, and two, to ensure that the strand moves out of the mold 11 and down the curved guide path 15 uniformly at a desired rate. Cooling means, such as water sprays (not shown) may be applied to the surface of the strand 12 between the exit end of the mold and the control rolls 14.
  • the curved guide path 15 conducts the strand 12 from a point below the mold to a horizontal guide path 16.
  • the curved guide path may be formed in any suitable manner for supporting and guiding the strand and for permitting the portion of the strand travelling along it to be cooled to some extent.
  • the guide path 16 may be formed of a sequence of idler rolls with water sprays for cooling arranged between the rolls and at opposite sides of the strand in a known manner for cooling the strand, or by a single or seg-- mented chute having cooling means incorporated therein or having spaces or openings with cooling devices, such as sprays or cooled surfaces, arranged therein.
  • the horizontal guide path 16 may be similarly constituted, or may be formed in any other suitable or conventional manner for guiding, supporting and cooling the strand.
  • whatever means is applied to cool the portion of the strand travelling from the mold 11 along the curved guide path 15 to the horizontal guide path 16 is applied to a degree to keep the skin 12a from being remelted by the heat of the molten core 12b but not enough to increase the thickness of the solidified skin, and correspondingly reduce the dimensions of the molten core, to an extent that the strand becomes rigid.
  • a liquid core is maintained in the strand (by limited exterior cooling) down to a portion of the strand which is on the horizontal guide path 16.
  • the strand is maintained in sufficiently limp flexible condition to straighten out by its own weight as it moves onto the horizontal guide path 16, so that no additional, external straightening force is required.
  • the strand may travel a considerable distance along a horizontal guide path 16-to'carry the strand in contact with further cooling devices, through annealing or temperature equalizing chambers, through shaping rolls, and/or in contact with cleaning devices, to a cutting station, for exampleso that additional force may have to be applied to continue the movement of the strand.
  • additional force may have to be applied to continue the movement of the strand.
  • driven forwarding roll 17 engaging the strand 12 at a position along the horizontal guide path 16.
  • the forwarding roll 17 merely serves to continue the movement of the strand further downstream, the movement of the strand from the mold 11 to at least the first portion of the horizontal guide path 16 being produced by a combination of gravity and the force applied by the control rolls 14.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US693430A 1967-12-26 1967-12-26 Continuous-casting method Expired - Lifetime US3542115A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US69343067A 1967-12-26 1967-12-26

Publications (1)

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US3542115A true US3542115A (en) 1970-11-24

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US693430A Expired - Lifetime US3542115A (en) 1967-12-26 1967-12-26 Continuous-casting method

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US (1) US3542115A (enrdf_load_html_response)
AT (1) AT290039B (enrdf_load_html_response)
CH (1) CH473626A (enrdf_load_html_response)
FR (1) FR1595158A (enrdf_load_html_response)
GB (1) GB1189750A (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747667A (en) * 1971-10-18 1973-07-24 G Carle Apparatus for continuous casting of metal strip
JPS5038631A (enrdf_load_html_response) * 1973-08-08 1975-04-10
US3945424A (en) * 1974-01-03 1976-03-23 Irving Rossi Method of straightening a continuously cast strand

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3766962A (en) * 1971-02-01 1973-10-23 I Rossi Method of continuously casting a slab
GB1381977A (en) * 1971-02-11 1975-01-29 Rossi I Apparatus for the continuous casting of metal
JPS5219165B2 (enrdf_load_html_response) * 1972-05-20 1977-05-26
IN155878B (enrdf_load_html_response) * 1980-04-02 1985-03-23 Nippon Steel Corp
AT388522B (de) * 1987-12-21 1989-07-25 Voest Alpine Ind Anlagen Verfahren zum herstellen von stranggegossenen strangstuecken sowie anlage zur durchfuehrung des verfahrens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747667A (en) * 1971-10-18 1973-07-24 G Carle Apparatus for continuous casting of metal strip
JPS5038631A (enrdf_load_html_response) * 1973-08-08 1975-04-10
US3945424A (en) * 1974-01-03 1976-03-23 Irving Rossi Method of straightening a continuously cast strand

Also Published As

Publication number Publication date
GB1189750A (en) 1970-04-29
FR1595158A (enrdf_load_html_response) 1970-06-08
AT290039B (de) 1971-05-10
CH473626A (de) 1969-06-15

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Date Code Title Description
AS Assignment

Owner name: SMS CONCAST INC.

Free format text: CHANGE OF NAME;ASSIGNOR:CONCAST INCORPORATED;REEL/FRAME:004397/0366

Effective date: 19850312

AS Assignment

Owner name: SMS CONCAST INC.

Free format text: CHANGE OF NAME;ASSIGNOR:CONCAST INCORPORATED;REEL/FRAME:004387/0592

Effective date: 19840808