US3593792A - Dummy bar for continuous casting - Google Patents

Dummy bar for continuous casting Download PDF

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Publication number
US3593792A
US3593792A US736095A US3593792DA US3593792A US 3593792 A US3593792 A US 3593792A US 736095 A US736095 A US 736095A US 3593792D A US3593792D A US 3593792DA US 3593792 A US3593792 A US 3593792A
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United States
Prior art keywords
dummy bar
casting
slot
insert
face
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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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US736095A
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English (en)
Inventor
Walter Hess
Horst Grothe
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Schloemann AG
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Schloemann AG
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Publication date
Application filed by Schloemann AG filed Critical Schloemann AG
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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
    • 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
    • B22D11/085—Means for storing or introducing the starter bars in the moulds

Definitions

  • the end face of the dummy bar which is to be ad- [54] DUMMY BAR FOR CONTINUOUS CASTING jacent to the casting is slanted at :an acute angle to the 5 Claims, 6 Drawing Figs dlrections m which the ad acent ends: are separated so as to slant outward toward a casting connected thereto, in the rela- U.S. five direction in which the dummy bar separates from the castl64/232 ing.
  • An insert is slidable in a first slot across the face of the l Int.
  • dummy bar in the relative direction in the dummy bar of Search 89 moves for the eparation and is normally therein a 283 shear pin arranged substantially at right angles to the Reerenm Cited directions of separation and is adapted to shear at a pressure exceeding a predetermined pressure applied for separating the UNITED STATES PATENTS dummy bar and casting.
  • the connection is made by a connect- 3,239,894 3/1966 Masters et al 164/274 ing member having one end adapted to be embedded in the 3,344,844 10/1967 Reinfeld et a1.
  • PATENTEB JULZO l9 Please note 1 OF 2 INVENTORS WALTER HESS HORST GROTHE L'GY aZWM ATTORHEYfi PATENTEU JUL20 nan SHEET 2 OF 2 HORST GRHE ATTORNEYS DUMMY BAR FOR CONTINUOUS CASTING
  • This invention is a dummy bar used in the continuous cast: ing of metal, such as steel.
  • The'invention relates particularly to improved means for connecting the lead end ofa continuously cast strand to a dummy bar at the start of casting, said means being adapted for subsequent disconnection in an improved manner.
  • molten metal is poured inthetopof an open-ended chill mold that cools and solidifies the periphery of metal the mold to form a cast strand which emerges from the bottom, exit end, of the mold into a chute; defined by a suitable guide and support means, which'conducts the strand away from the mold.
  • the casting is further cooled to solidify it completely; it is shaped or otherwise worked before or after complete solidifi cation and is eventually cut into suitable lengths.
  • the exit end of the mold is temporarily plugged by a dummy bar until sufficient molten metal accua mulates in the mold for a cast strand to form after which the dummy bar is withdrawn and down the chute in front of the casting.
  • the end of the dummy bar which plugs the mold can: ries a projecting T-headed member around which metal in the mold solidifies to attach the dummy. bar to thelead end of the' casting being formed.
  • additional molten metal is poured into the mold to replenish the metal withdrawn by the casting and to. maintain an appropriate level of metal in the mold for the cast-, ing to continue.
  • connection be capable of being released as simply and quickly as possible, and with a minimum of damage to either the cast. ing or the dummy bar.
  • Dummy bars are known in which the connection to the cast ing is provided by sections of rails, or other structural shapes' which have enlarged end portions joined by a relatively thin;
  • connection which is to be at the connection, with one enlarged endv slidably received in slots across the end of the dummy bar and the other end projecting outward to become embedded in the casting.
  • the connection is subsequently released for separating the dummy bar from the casting by pressure applied to: move the adjacent ends of the dummy bar and casting relative. ly apart in opposite directions approximately at right angles to: an axial line between the dummy bar and casting so that the: rail sections slide out of the endof theslot in the dummy bar.
  • the end of the casting is in intimate contact with the end of the dummy bar. Consequently, with known dummy bars, the sliding friction of the adjacent endswhen these ends are moved relatively apart in the aforesaid manner-is apt to cause sufficient drag for the casting to be bent or otherwise damaged. If, in addition, the molten metal has penetrated the slots in the dummy bar and solidified around the ends of the rail sections therein, the connection;
  • Another important object is to provide a connection in which, if the rail sections or other connecting elements are prevented from sliding out of the slots in the dummy bar-due to metal entering and solidifying in the slots, or for any other reason-supplemental connecting means are released by the application of slight additional pressure so as to enable the dummy bar and casting to separate without having to apply much greater additional pressure, or having to use extraordinary measures which would probably damage the casting and would also be likely to damage the dummy bar.
  • the end face of the dummy bar which is adjacent to the lead end of the casting when the dummy bar and casting are connected is a plane which is perpendicular to the longitudinal axis of the dummy bar and of the separation force applied to the dummy bar to cause the dummy bar to separate from the casting so that sliding friction of one end across the other is avoided.
  • connection is made by one or more connecting members (such as sections of rails), each having one end slidable in a slot in the end face of the dummy bar and another end embedded'in the casting.
  • connecting members such as sections of rails
  • the ends of the connecting members which are slidable across the end face of the dummy bar are slidably received in slots in inserts, which in turn are slidable in slots in the end face of the dummy bar.
  • the respective slots extend substantially in the directions in which the adjacent ends of the dummy bar and casting separate and are open-ended to permit the connecting members to slide out of the ends of the slots in the inserts, or the inserts to slide out of the end of the slots in the end face of the dummy bar, whenpressure is applied to separate the dummy bar from'the casting.
  • the inserts are normally retained in the slots in the dummy bar by shear pins which the from the inserts into the walls of the slots in the dummy bar.
  • the shear pins are substantially at right angles to the relative directions in which the dummy bar andcasting separate and are adapted to shear at a pressure exceeding a predetermined pressure applied for separating the dummy bar from the casting.
  • FIG. 1 is a top plan view of the end ofa dummy bar embodying present invention
  • FIG. 2 is a side elevation of an insert which is normally supported in the end face of a dummy bar of the invention, but showing the insert apart therefrom and showing a connecting member in position in the insert;
  • FIG.' 3 is a vertical section along the line 3-3 of FIG. I;
  • FIG. 4 is a side elevation ofa portion of one type of continuous-casting apparatus showing the portion at which a dummy bar is separated from a casting;
  • FIG. 5 is a fragmentary side elevation of a section of another type of continuous-casting apparatus in which the casting undergoes bending after the dummy bar is separated therefrom, the portion shown being the section at which the dummy bar is separated;
  • FIG. 6 is a side elevation of a portion of still another type of continuous casting-apparatus in which the dummy bar and casting remain in vertical positions after being separated, said portion being the portion at which the separation is carried out.
  • a dummy bar is connected to the lead end 11 of a continuouscasting 12, by one or more connecting members 13.
  • Each connecting member 13 has enlarged ends 13a and 13b joined by a relatively thin web portion 13c and is suitably provided by a section of rail.
  • the ends 13a are slidably received in matching slots 14 in the end face 15 of the dummy bar 10 which is adjacent to the lead end 11 of the casting 12 for the connection; the opposite ends 13b are embedded in the casting.
  • the casting 12 is a broad slab for which a number of connecting members 13 are appropriately provided along the end face of the correspondingly dimensioned dummy bar.
  • the number and spacing of connecting members 13 provided depends upon the dimensions of the casting and dummy bar. In some cases one will be enough.
  • the slots 14 extend in the directions of relative movement of the casting and dummy bar so that, in the ideal situation, the ends 130 slide out the ends of the slots 14 to free the dummy bar.
  • the connecting members 13 remain embedded in the casting 12 and may subsequently be removed by cutting off the end of the casting.
  • the release of the dummy bar 10 from the casting 12 is conventionally facilitated by placing a sheet 18 of asbestos or the like and an overlaying sheet 19 of metal on the end face 15, which is at the connection, the sheets 19 and 18 being appropriately cut out and fitted around the connecting members 13.
  • the end face 15 of the dummy bar is slanted at an acute angle to the direction of the separation this direction force applied to the dummy bar, this direction being indicated by arrow 16.
  • each slot 14 in the end face 15 of the dummy bar 10 is in an insert 20 which is itself slidable in a slot 21 in the end face 15 of the dummy bar.
  • the slot 21 extends in the direction of relative movement of the casting and dummy bar and at least one end of the slot 21 (the bottom end) opens through the side of the dummy bar 10 to permit the insert 20 to slide out the end of the slot 21 to free the dummy bar 10 from the casting 12 if the end 13a of connecting member 13 sticks in slot 14 when the dummy bar and casting are moved relatively apart.
  • the inner portion of the slot 21 is enlarged (as best seen in FIG. 1) in comparison with a relatively narrower neck portion opening through the end face 15 of the dummy bar and has shoulders 22 between the neck and inner portion facing inward.
  • the shape of theinsert 20 corresponds to the shape of the slot 21 and has shoulders 23 to slidably engage shoulders 22 when the insert is in position in the slot 21.
  • the insert 20 is dimensioned to provide good clearance within the slot 21 so as to allow for thermal expansion and enable it to slide easily in slot 21.
  • the insert 20 is normally held in the slot by one or more shear pins 25 having their ends mounted respectively in the insert 20 and dummy bar 10 and extending substantially at right angles to the directions (arrows l6 and 17) in which the dummy bar 10 and casting 12 separate.
  • shear pins 25 are shown extending between the insert and dummy bar through the respective shoulders 22 and 23.
  • The'shear pins 25 are dimensioned to shear off, and free the insert to slide out of the slot 21, at a pressure in excess of the pressure normally required to slide the end 1311 of the connecting member 13 out of the slot 14 when the dummy bar 10 and casting 12 are moved relatively apart and when nothing such as metal in the slot 14 locking the end 13a thcreinobstructs the sliding of the end 13a.
  • the faces of the shoulders 22 and 23 are slanted oppositely from the slant of the end face 15 of the dummy bar 10. That is, the shoulders 22 and 23 slant at an acute angle to the directions ofseparation of the dummy bar and casting (indicated by arrows 16 and 17), but slant inward, away from the casting 12, in the relative direction in which the dummy bar separates from the casting (arrow 16).
  • FIGS. 4, 5 and 6 illustrate the operation of a dummy bar, which embodies this invention, in the portions of three different types of continuous-casting apparatus in which the dummy bar 10 is separated from the casting 12 by relative movement in opposite directions (arrows 16 and 17 in FIGS. 1 to 3).
  • the dummy bar 10 moves in a horizontal direction, passing through a bank of withdrawal and straightening rolls 30 and moving to the right until the junction between the dummy bar 10 and casting 12 is in a disconnecting mechanism 31 consisting of a pair of fixed rollers 32 for holding the lead end 11 of the casting 12, and an upwardly movable pressure cylinder 33 for lifting the (rear) end of the dummy bar 10 up so that the end face 15 of the dummy bar moves up and away from the lead end 11 of the casting.
  • a disconnecting mechanism 31 consisting of a pair of fixed rollers 32 for holding the lead end 11 of the casting 12, and an upwardly movable pressure cylinder 33 for lifting the (rear) end of the dummy bar 10 up so that the end face 15 of the dummy bar moves up and away from the lead end 11 of the casting.
  • the dummy bar 10-whose forward end is at an angle to the rearward end which is connected to a casting 12- is received in an elongated housing 34 which is normally arranged at an angle to intersect the path of the dummy bar.
  • the forward (right) end of the housing 34 is supported on a roller 35 and its rearward (right) end is moved up and down by a cable 36 passing over an idler pulley 37 and connected to a piston 38 which is moved up and down by a suitable pressure cylinder for raising and lowering the housing 34.
  • the end face 15 of the dummy bar is in position for a worker 39 on a platform 40 to insert a new connecting member 13 in the insert 20 in the end face 15 of the dummy bar (or otherwise condition the end face 15) to prepare the dummy bar for use in a subsequent casting run.
  • the dummy bar 10 is drawn into, and let out of, the housing 34 by a cable 41 attached to the lead end of the dummy bar and passing over an idler pulley 42, which is mounted on the forward end of the housing, and wound on a power-driven drum indicated at 43. After the dummy bar 10 has thus been lifted up in the housing 34, the casting I2 continues in a horizontal path, illustrated in dash lines.
  • the dummy bar 10 and casting 12 moves vertically down.
  • the dummy bar is held in a vertical path by a thrust block 45 and the lead end 11 of the casting 12 is moved to one side (to the left) by a laterally movable pressure roller 46.
  • the pressure roller 46 moves to the position shown in dashlines to deflect the casting into a curved pathshown by the dashline position of the casting 12-defined by the guide roller 43.
  • the thrust block 45 is carried on bracket 47 which is movable in a vertical path. As the dummy bar 10 moves down from the disconnecting point, the bracket 47 and thrust block 45 move down with it, to the lower position indicated in dashlines, in order to provide continuing vertical support for the dummy bar.
  • the dummy bar It), and casting 12 move vertically down between pairs ot'guide rollers 49 with the lowermost end of the dummy bar (and subsequently the lowermost end of the casting) supported on a carriage 50, which is movable vertically on rails 51 to guide and support the dummy bar (or casting) ina downward vertical path.
  • the dummy bar is disconnected by a laterally movable pressure roller 52, which is operated to move the upper end of the dummy bar to the leftin concert with a resiliently supported counter roller 53 in a support 54.
  • the dummy bar After the dummy bar is thus disconnected, it is moved down by the carriage 50 until it is in position to be grasped by a pair of gripping jaws 55 on a carriage 56 which is movable horizontally on a track indicated at 57.
  • the carriage 56 moves to the left to carry the dummy bar out of the vertical path of the casting 12.
  • the pressure roller 52 and counter roller 53 return to the right and'the downward movement of the casting I2 is continued.
  • the vertically movable carriage 50 is moved up to engage and support the lead end I] of the casting and is then moved down to support and guide the casting in a downward vertical path indicated in dashlines.
  • a dummy bar adapted to be connected in axial end to end relation to the lead end of a continuous casting and to be separated therefrom by moving the dummy bar and casting relatively in opposite directions approximately at right angles to an axial line through the connection from the dummy bar to the casting, the end face of the dummy bar, which is to be at the connection, being slanted at an acute angle to a plane which is perpendicular to the longitudinal axis of the dummy bar and to the direction of the separation force applied to the dummy bar to cause the dummy bar to separate from the castmg.
  • the dummy bar of claim I and in combination, an insert slidably received in a first slot in said face end of the dummy bar.
  • said slot extending across said face in the approximate directions in which the adjacent ends of the dummy bar and casting separate, the ends of the slot being open through the sides of the dummy bar for the insert to slide out, a shear pin having its ends mounted substantially at right angles to the directions of separation of the dummy bar and casting for attaching the insert in the slot, said shear pin being adapted under a pressure exceeding a predetermined pressure applied for separating the dummy bar and casting, a connecting member having one end adapted to be attached to a casting adjacent to said end face of the dummy bar and another end slidably received in a second slot in said insert for connecting the casting to the dummy bar, said second slot extending across the insert in the approximate relative directions in' which the dummy bar and castingse'parate, said second slot having an end open through one side of the insert for said other end of the connecting member
  • the dummy bar of claim 4 including more than one of said inserts in slots spaced along the length of the face end of the dummy bar with a shear pin and connecting member for each insert.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
US736095A 1967-06-14 1968-06-11 Dummy bar for continuous casting Expired - Lifetime US3593792A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESC040884 1967-06-14

Publications (1)

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US3593792A true US3593792A (en) 1971-07-20

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US736095A Expired - Lifetime US3593792A (en) 1967-06-14 1968-06-11 Dummy bar for continuous casting

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US (1) US3593792A (de)
AT (1) AT285079B (de)
CH (1) CH475050A (de)
DE (1) DE1558313A1 (de)
FR (1) FR1574993A (de)
GB (1) GB1195152A (de)
SE (1) SE343773B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823763A (en) * 1972-10-19 1974-07-16 United States Steel Corp Ramp-type apparatus for disconnecting and storing a flexible starter bar
US4098322A (en) * 1976-04-30 1978-07-04 Vereinigte Osterreichische Eisen- Und Stahlwerke - Alpine Montan Aktiengesellschaft Starter bar to be used 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
US4623016A (en) * 1981-05-20 1986-11-18 Danieli & C. Officine Meccaniche S.P.A. Device for parking the dummy bar upstream from the extraction and straightening group

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2759660B2 (de) * 1977-03-31 1981-07-16 Mannesmann Demag Ag, 4100 Duisburg Stranggießvorrichtung mit einer Anfahrstrang-Aufnahme für einen kurzen Anfahrstrang
DE2714338C3 (de) 1977-03-31 1984-08-02 Mannesmann AG, 4000 Düsseldorf Anfahrstrang-Transportvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA710250A (en) * 1965-05-25 George C. Geisen, Jr. Connector with severable elements for continuous-casting starter-bar sections
US3239894A (en) * 1963-03-06 1966-03-15 United States Steel Corp Starter-bar head with make-and-break joint
US3344844A (en) * 1964-08-10 1967-10-03 Koppers Co Inc Apparatus for handling a curved continuous casting starting bar
US3372731A (en) * 1964-08-29 1968-03-12 Schloemann Ag Method of withdrawing the strand from a continuous casting machine
US3464482A (en) * 1965-07-23 1969-09-02 United Eng Foundry Co Continuous casting

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA710250A (en) * 1965-05-25 George C. Geisen, Jr. Connector with severable elements for continuous-casting starter-bar sections
US3239894A (en) * 1963-03-06 1966-03-15 United States Steel Corp Starter-bar head with make-and-break joint
US3344844A (en) * 1964-08-10 1967-10-03 Koppers Co Inc Apparatus for handling a curved continuous casting starting bar
US3372731A (en) * 1964-08-29 1968-03-12 Schloemann Ag Method of withdrawing the strand from a continuous casting machine
US3464482A (en) * 1965-07-23 1969-09-02 United Eng Foundry Co Continuous casting

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823763A (en) * 1972-10-19 1974-07-16 United States Steel Corp Ramp-type apparatus for disconnecting and storing a flexible starter bar
US4098322A (en) * 1976-04-30 1978-07-04 Vereinigte Osterreichische Eisen- Und Stahlwerke - Alpine Montan Aktiengesellschaft Starter bar to be used 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
US4623016A (en) * 1981-05-20 1986-11-18 Danieli & C. Officine Meccaniche S.P.A. Device for parking the dummy bar upstream from the extraction and straightening group

Also Published As

Publication number Publication date
FR1574993A (de) 1969-07-18
DE1558313A1 (de) 1970-07-23
AT285079B (de) 1970-10-12
GB1195152A (en) 1970-06-17
SE343773B (de) 1972-03-20
CH475050A (de) 1969-07-15

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