US3602290A - Dummy bar for continuous casting - Google Patents

Dummy bar for continuous casting Download PDF

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Publication number
US3602290A
US3602290A US754808A US3602290DA US3602290A US 3602290 A US3602290 A US 3602290A US 754808 A US754808 A US 754808A US 3602290D A US3602290D A US 3602290DA US 3602290 A US3602290 A US 3602290A
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US
United States
Prior art keywords
head
dummy bar
mold cavity
notch
casting
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
US754808A
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English (en)
Inventor
George E Schmidt
Lyle J Johnson
Willi Simons
Walter Hess
Josef Bard
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.)
Schloemann AG
MCLOUTH STEEL CORP
Original Assignee
Schloemann AG
MCLOUTH STEEL CORP
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 Schloemann AG, MCLOUTH STEEL CORP filed Critical Schloemann AG
Application granted granted Critical
Publication of US3602290A publication Critical patent/US3602290A/en
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
    • B22D11/08—Accessories for starting the casting procedure
    • B22D11/081—Starter bars
    • B22D11/083—Starter bar head; Means for connecting or detaching starter bars and ingots

Definitions

  • means for removably connecting the head of the dummy bar to a casting being formed in the mold comprises a notch in one side of the dummy bar head.
  • the notch has a deeply indented portion and a less deeply indented portion between the deeply indented portion and the end of the head that is within the mold when the head is inserted in the mold to plug it.
  • the notch and adjacent wall of the mold form a hooklike cavity in which molten metal poured into the mold for the casting flows and solidifies for making the connection. Then when the dummy bar and the casting attached thereto are withdrawn from the mold, they are separated by moving the dummy bar sideways in a direction to unhook them.
  • the present invention relates to dummy bars which are used to removably plug ends of open ended mold cavities in the continuous casting of metal, such as steel.
  • the invention relates particularly to a dummy bar head which provides improved means for temporarily connecting the lead end of a continuous casting to a dummy bar at the start of casting.
  • molten metal is poured in the top of an open-ended mold cavity of a chill mold that cools and solidifies the periphery of the metal therein to form a casting which is withdrawn from the bottom or exit end of the mold cavity.
  • the exit end of the mold cavity is temporarily plugged by a dummy bar until sufiicient molten metal accumulates in the mold for the casting to form.
  • Connecting means is provided at the end of the dummy bar, which is within the mold cavity, for connecting the dummy bar to the casting being formed.
  • means for connecting the dummy bar to the casting customarily consists of a projection from the dummy bar head around which the metal solidifies. The projecting portion of the head then becomes firmly embedded in the casting.
  • One known arrangement consists in having the projection provided by a section of rail which has a base flange keyed in a groove across the dummy bar head.
  • the dummy bar is subsequently separated from the casting by moving the casting and dummy bar laterally apart to slide the base flange out of the groove.
  • the section of rail remains embedded in the casting and must be replaced by a new section to prepare the dummy bar for reuse, which takes time and wastes material.
  • this arrangement sometimes causes difficulty because the molten metal tends to become welded to the surface of the dummy bar head, as well as to the rail, so that extra time and effort is required to effect the separation.
  • the force that may have to be applied or the method that may have to be employed for the separation may damage the dummy bar.
  • the head which has a removable section of rail or other element to become embedded in the casting, is separably connected to the body of the dummy bar by a hooklike joint or other joint which is disconnectable by bending or shifting the dummy bar sideways relative to the casting.
  • the connecting element such as a section of rail
  • the connecting element is removed from the head, which may then be fitted with a new connecting element and reattached to the body of the dummy bar for reuse.
  • the head of course, cannot be severed from the casting until the casting has come to rest at the end of a casting run.
  • the of the dummy bar from its head and the head from the casting thus requires three individual steps so that the manner of separating the dummy for reuse is complicated and time consuming.
  • means for removably connecting the dummy bar to a continuous casting is provided by a notch in the side of the portion of the dummy bar head that is received in one end of the mold cavity.
  • the notch has a deeply indented portion and a less deeply indented portion whichis between the deeply indented portion and the end of the dummy bar head that is received in the mold cavity.
  • the notch thus forms a hooklike cavity with the adjacent wall of the mold cavity so that molten metal poured in the unplugged end of the mold cavity for the casting flows into the hooklike cavity and solidifies therein to make the connection by the interlocking hooks provided by the notch and the solidified metal
  • the dummy bar and the casting attached thereto are withdrawn from the mold cavity-by known withdrawal mechanism which engages the sides of the dummy bar and pulls the dummy bar and casting longitudinally from the mold cavity-they are subsequently disconnected by moving the dummy bar head sideways relative to the casting so that the said interlocking hooks disengage. This may be accomplished while the casting is moving along its path from the mold, and the dummy bar, which is then removed from the path of the casting, is ready for reuse.
  • FIG. 1 is a front view of a dummy bar head embodying the present invention:
  • FIG. 2 is a plan view of the dummy bar head of FIG. 1, showing it in operative position in the cavity of a continuous casting mold;
  • FIG. 3 in a plan view similar to FIG. 2, but illustrating an alternative form of a dummy bar head embodying the invention
  • FIG. 4 is a cross-sectional view along the line 4-4 of FIG. 1;
  • FIG. 5 is a cross-sectional view similar to FIG. 4, but illustrating alternative structure.
  • a dummy bar head 10 embodying the present invention is adapted to be removably received in, and to plug, the bottom end of a mold cavity 11 of a continuous-casting mold 12.
  • the cross-sectional configuration of the mold cavity 11 is illustrated as being rectangular, for casting steel slabs. Mold cavities and corresponding dummy bar heads of other configurations are, of course, used for casting other cross-sectional shapes, such as round, square, channel or I- beam, and it will be appreciated that the present invention is adapted for dummy bar heads of various cross-sectional configurations, the rectangular configuration being for illustrative purposes only.
  • the bottom portion of the dummy bar head 10 is provided with vertical slots 13 and horizontal bores 14 by which the dummy bar head is hinged to the body of a dummy bar (not shown) in a conventional manner.
  • the hinged joint is such as to permit deflection only in one direction-for example, by pivotally connecting the dummy bar and the dummy bar head 10 by a pivot pin through the lower bore, and by utilizing a pin through the upper bore 14 as a stop pin to be engaged by the upper end of the body of the dummy bar for preventing pivotal movement in one direction.
  • the cross-sectional configuration of the lower part 10a of the dummy bar head 10 conforms to the cross-sectional configuration of the bottom end of the mold cavity 11 so as to plug this end of the cavity.
  • the upper part 1011 of the dummy bar head 10, which extends up into the mold cavity 11, has a notch 15 in one side while its opposite side abuts the sidewall 16 of the mold cavity 11.
  • the notch 15 has a relatively deeply indented portion 15a and a less deeply indented portion 15b between the deeply indented portion 15a and the upper end 17 of the dummy bar head, so that it has a hooklike vertical cross section and leaves a ledge 18 across its upper end.
  • the notch 15 forms a hooklike cavity with the adjacent wall 19 of the mold cavity 11 so that molten metal poured into the upper end of the mold cavity for the casting flows down into the hooklike cavity and solidifies therein to connect the dummy bar head to the casting.
  • the deeply indented portion 15a of the notch 15 is defined by a bottom wall 20, upper and lower end walls 21 and 22, and, in the embodiment illustrated in FIGS. 1 and 2, by opposite sidewalls 23.
  • the notch 15 is open only through one side of the dummy bar head.
  • the notch 15 extends completely across one side of the dummy bar head so that the sides of the notch are open-to be blocked by the adjacent walls of the mold cavity when the dummy bar head is received therein.
  • the bottom wall 20 of the deeply indented notch portion 15a is shown as being substantially parallel to the outer wall of the dummy bar head behind it, but this parallelism is not necessary.
  • the lower end wall 22 illustrates such divergence; the upper end wall 21 is shown substantially parallel to the aforesaid horizontal plane.
  • the sidewalls 23 (FIG. 2) each diverge outward at the same angle, or, if the sidewalls 23 do not diverge, to have them parallel to each other.
  • the sidewalls are also preferably flat except for their outer marginal edges which may advantageously be rounded.
  • connection between the casting and the dummy bar head is also suitable stabilized by having at least one of the end walls 21 and 22 inclined from its outer ends toward its central portion.
  • the degree of inclination is approximately the same, and in the same direction, at opposite sides of the central portion, as illustrated by the inclination of upper end wall 21 in FIG. 1.
  • the outer portions of the upper end wall 21 are inclined downward from the central portion so that the vertical cross section of the relatively deeply indented portion 150 of the notch is greater at the center.
  • FIG. 5 illustrates a modification of the notch in which the upper end wall 21a is shown as being undercut to form a barb. This further assures a firm connection between the casting the dummy bar head until it is desired to separate them. The manner of effecting the separation is subsequently described in detail.
  • the upper end 17 of the dummy bar head may be horizontal, or it may be slanted, as shown, which reduces splashing as molten metal is poured into the mold cavity 11 and directs molten metal into the hooklike cavity formed by the notch 15.
  • an opening 25 is provided through the central portion of the ledge 18, which is between the less deeply indented portion 15b of the notch 15, and the upper end 17 of the dummy bar head 10, so as to provide an opening from the upper end 17 directly through to the relatively deeply indented portion 150 of the notch. This opening 25 assists in centering a stream of molten metal being poured into the mold cavity 11 and reduces splashing.
  • FIG. 3 illustrates another embodiment in which three openings 27 are provided through the ledge 17, one being at the central portion in the position occupied by the opening 25 in the embodiment shown in FIGS. 1 and 2.
  • the openings 25 and 27 also facilitate the complete filling of the hooklike cavity with the metal of the casting and provide reinforcing ribs in the portion of the casting between the portion in said cavity and the portion above the dummy bar head.
  • the most wear on the dummy bar head 10 occurs in the notch 15, and another means of extending the service life of the upper part 10b of the dummy bar head 10 is to provide the notch 15 with a replaceable lining, indicated at 30 in FIG. 5, which may be formed of sheets of a metal which has appropriate thermal conductivity and resistance to thermal shock best adapted to withstand the repeated heating and cooling to which the surfaces of the dummy bar head are subjected.
  • the dummy bar head 10 At some point after the dummy bar head 10 has been drawn out of the mold cavity, and preferably after it has passed the withdrawal and straightening mechanism, it is separated from the casting by relative movement of the dummy bar head and casting apart at an angle to the longitudinal axes of the dummy bar head and casting. The angle is such that the hooklike portion of the casting formed by the notch 15 disengages therefrom.
  • This relative movement may suitably be applied by moving or bending the dummy bar head 10 to the side while a portion of the casting following the dummy bar head is in the straightening mechanism which thus serves as a counterhold for the casting.
  • the separation is suitably affected by moving the dummy bar head relatively to the left at right angles to the direction of travel of the dummy bar and casting (which travel downwardly in the direction of their longitudinal axes). If the notch 15 is barbed as illustrated in FIG. 5, the resultant separating movement would be up and to the left at an oblique angle rather than at right angles to the direction of travel. This latter separating movement may be accomplished by applying a combination of forcesone at right angles to the direction of travel and one opposite to the direction of travel-so that the resultant applied force is up and to the left as aforesaid.
  • the opposing force may be applied just before applying the force at right angles, or the withdrawal speed of the dummy bar may be reduced and this combination of forces then applied at one time.
  • the relative motion of the dummy bar to accomplish the separation may be provided by the operation of a storage device for the dummy bar.
  • a storage device for the dummy bar.
  • the separation is assisted by the shrinkage of the portion of the casting within the notch as the casting cools.
  • the separation may also be facilitated by applying release coatings of graphite or other material to the surfaces of the notch 15 or by covering these surfaces with layers of asbestos.
  • the dummy bar is removed from the path of movement of the casting by suitable means, such as the above-mentioned storage device.
  • suitable means such as the above-mentioned storage device.
  • the casting is then free to continue on its way and the dummy bar is in condition for use for a subsequent casting run.
  • a dummy bar having a head adapted for removably attaching the dummy bar to the end of a continuous metal casting formed in the open-ended mold cavity, said head comprising a lower part and an upper part, the lower part of said head having a cross-sectional configuration and dimension to removably fit in and plug an end of the mold cavity, the upper part of said head having a notch in one side, at least a portion of the wall of the head at the opposite side from the notch being adapted to abut the adjacent portion of the sidewall of the mold cavity when the head is in said end of the mold cavity for preventing molten metal in the mold cavity from penetrating between said adjacent wall portions of the head and mold cavity, said notch having a relatively deeply indented portion and a less deeply indented portion between the deeply indented portion and the end of the head that is within the mold cavity when the head is in said end thereof for forming a hooklike cavity into which molten metal poured into the mold cavity flows and solidifies for attaching
  • a dummy bar having a head adapted for removably attaching the dummy bar to the end of a continuous metal casting formed in the open ended mold cavity, said head comprising a lower part and an upper part, the lower part of said head having a cross-sectional configuration and dimension to removably fit in and plug an end of the mold cavity, the upper part of said head having a notch in one side, at least a portion of the wall of the head at the opposite side from the notch being adapted to abut the adjacent portion of the sidewall of the mold cavity when the head is in said end of the mold cavity for preventing molten metal in the mold cavity from penetrating between said adjacent wall portions of the head and mold cavity, said notch having a relatively deeply indented portion and a less deeply indented portion between the deeply indented portion and the end of the head that is within the mold cavity when the head is in said end thereof for forming a hooklike cavity into which molten metal poured into the mold cavity flows and solidifies for attaching the upper part
  • a dummy bar having a head adapted for removably attaching the dummy bar to the end of a continuous metal casting formed in the open-ended mold cavity, said head comprising a lower part and an upper part, the lower part of said head having a cross-sectional configuration and dimension to removably fit in and plug an end of the mold cavity, the upper part of said head having a notch in one side, at least a portion of the wall of the head at the opposite side from the notch being adapted to abut the adjacent portion of the sidewall of the mold cavity when the head is in said end of the mold cavity for preventing molten metal in the mold cavity from penetrating between said adjacent wall portions of the head and mold cavity, said notch having a relatively deeply indented portion and a less deeply indented portion between the deeply indented portion and the end of the head that is within the mold cavity when the head is in said end thereof for forming a hooklike cavity into which molten metal poured into the mold cavity flows and solidifies for attaching the upper

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Continuous Casting (AREA)
US754808A 1968-08-23 1968-08-23 Dummy bar for continuous casting Expired - Lifetime US3602290A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75480868A 1968-08-23 1968-08-23

Publications (1)

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US3602290A true US3602290A (en) 1971-08-31

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ID=25036429

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Application Number Title Priority Date Filing Date
US754808A Expired - Lifetime US3602290A (en) 1968-08-23 1968-08-23 Dummy bar for continuous casting

Country Status (6)

Country Link
US (1) US3602290A (fr)
AT (1) AT307646B (fr)
BE (1) BE737771A (fr)
FR (1) FR2017018B1 (fr)
GB (1) GB1251875A (fr)
SE (1) SE406162B (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717198A (en) * 1970-01-27 1973-02-20 Concast Ag Adjustable dummy bar head for continuous casting
US3921706A (en) * 1973-10-19 1975-11-25 Voest Ag Starter bar for use in continuous casting plants
US4332289A (en) * 1979-10-08 1982-06-01 Voest-Alpine Aktiengesellschaft Starter bar head to be used for casting metal in a continuous casting mould of a continuous casting plant
US4381030A (en) * 1980-01-25 1983-04-26 Concast Ag Dummy bar head for a steel continuous casting installation containing an open-ended mold
US4494059A (en) * 1970-06-08 1985-01-15 Kearns Robert W Structure for and method of surface conditioning sensing and indicating and motor speed control
US4940075A (en) * 1988-03-24 1990-07-10 Mannesmann Ag Start-up head for horizontally continuous casting
US20090223646A1 (en) * 2005-11-02 2009-09-10 Norio Yamamoto Apparatus for melting metal and method for manufacturing metal
CN105728677A (zh) * 2016-04-27 2016-07-06 中国重型机械研究院股份公司 一种超厚断面立式板坯连铸机引锭杆
WO2016178877A1 (fr) * 2015-05-04 2016-11-10 Retech Systems Llc Tête d'extracteur filetée conique
CN113102700A (zh) * 2021-03-09 2021-07-13 广东韶钢松山股份有限公司 一种方坯连铸引锭头

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149582A (en) * 1977-07-28 1979-04-17 Concast Incorporated Dummy bar head for continuous casting and method of starting a continuously cast strand

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB763970A (fr) *
DD43554A (fr) *
DE674136C (de) * 1935-10-24 1939-04-05 Duerener Metallwerke A G Kokille zum ununterbrochenen Giessen dichter Bloecke
US2176990A (en) * 1937-08-18 1939-10-24 Chase Brass & Copper Co Apparatus for continuously casting metals
US3239894A (en) * 1963-03-06 1966-03-15 United States Steel Corp Starter-bar head with make-and-break joint
US3372731A (en) * 1964-08-29 1968-03-12 Schloemann Ag Method of withdrawing the strand from a continuous casting machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB763970A (fr) *
DD43554A (fr) *
DE674136C (de) * 1935-10-24 1939-04-05 Duerener Metallwerke A G Kokille zum ununterbrochenen Giessen dichter Bloecke
US2176990A (en) * 1937-08-18 1939-10-24 Chase Brass & Copper Co Apparatus for continuously casting metals
US3239894A (en) * 1963-03-06 1966-03-15 United States Steel Corp Starter-bar head with make-and-break joint
US3372731A (en) * 1964-08-29 1968-03-12 Schloemann Ag Method of withdrawing the strand from a continuous casting machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717198A (en) * 1970-01-27 1973-02-20 Concast Ag Adjustable dummy bar head for continuous casting
US4494059A (en) * 1970-06-08 1985-01-15 Kearns Robert W Structure for and method of surface conditioning sensing and indicating and motor speed control
US3921706A (en) * 1973-10-19 1975-11-25 Voest Ag Starter bar for use in continuous casting plants
US4332289A (en) * 1979-10-08 1982-06-01 Voest-Alpine Aktiengesellschaft Starter bar head to be used for casting metal in a continuous casting mould of a continuous casting plant
US4381030A (en) * 1980-01-25 1983-04-26 Concast Ag Dummy bar head for a steel continuous casting installation containing an open-ended mold
US4940075A (en) * 1988-03-24 1990-07-10 Mannesmann Ag Start-up head for horizontally continuous casting
US20090223646A1 (en) * 2005-11-02 2009-09-10 Norio Yamamoto Apparatus for melting metal and method for manufacturing metal
WO2016178877A1 (fr) * 2015-05-04 2016-11-10 Retech Systems Llc Tête d'extracteur filetée conique
US9968995B2 (en) 2015-05-04 2018-05-15 Retech Systems Llc Tapered threaded puller head
CN105728677A (zh) * 2016-04-27 2016-07-06 中国重型机械研究院股份公司 一种超厚断面立式板坯连铸机引锭杆
CN113102700A (zh) * 2021-03-09 2021-07-13 广东韶钢松山股份有限公司 一种方坯连铸引锭头

Also Published As

Publication number Publication date
BE737771A (fr) 1970-02-02
SE406162B (sv) 1979-01-29
FR2017018A1 (fr) 1970-05-15
FR2017018B1 (fr) 1974-05-03
GB1251875A (fr) 1971-11-03
AT307646B (de) 1973-05-25
DE1942596B2 (de) 1975-12-11
DE1942596A1 (de) 1970-04-30

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