JP2008272804A - Dummy bar head for continuous casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dummy bar head for continuous casting, capable of preventing degradation of sealability against molten steel by suppressing thermal deformation. <P>SOLUTION: A dummy bar head for continuous casting, which is bonded by solidification to molten steel 11 poured into a casting mold 12, is drawn out together with the molten steel 11 to make a cast slab. On the upper part of a dummy bar head 21, which is arranged at the tip end of a dummy bar 13, head parts 32 are provided with slits 31 formed. The slits 31 absorb the thermal deformation at the head parts 32, which is caused by the molten steel 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a continuous casting dummy bar head used for pulling a cast piece from a mold during continuous casting.

  Generally, an iron mill or the like is provided with a continuous casting machine for continuously producing a slab obtained by casting molten steel. In this continuous casting machine, after inserting the dummy bar head provided at the tip of the dummy bar into the lower opening of the cylindrical mold having openings on the upper and lower sides, the molten steel is injected from the upper opening, and the dummy bar head The molten steel is solidified and bonded, and the molten steel is continuously drawn out from the mold through the dummy bar, whereby a slab having a uniform cross section such as a round shape or a square shape is manufactured. Then, after solidification has progressed to the inside of the manufactured slab, by cutting this slab into a predetermined length, it is possible to obtain a steel strip (slab or strip) as a material in a subsequent process such as rolling. it can.

  Such a conventional continuous casting machine is disclosed in Patent Document 1, for example.

JP-A-7-284889

  In recent years, in the steel strip production line, the steel strip to be manufactured has been made thinner due to the demand for weight reduction of the final product and the omission of the subsequent rolling process. The slab is also made thinner.

  However, if an attempt is made to produce a thin slab using the conventional continuous casting machine, the thickness of the dummy bar head is reduced as the slab becomes thinner, and its heat capacity is reduced, so that the high temperature injected into the mold is reduced. Due to the molten steel, the dummy bar head is easily deformed by heat. When manufacturing such a thin slab, thermal deformation in the longitudinal direction of the dummy bar head, that is, in the width direction of the slab increases, and as a result, a gap is formed between the mold and the dummy bar head. As a result, the sealing performance of the molten steel may be reduced.

  Accordingly, an object of the present invention is to provide a dummy bar head for continuous casting that can solve the above-described problems and can suppress thermal deformation and prevent deterioration of the sealing performance of molten steel.

The dummy bar head for continuous casting according to the first invention for solving the above-mentioned problems is
A continuous casting dummy bar head that solidifies and bonds with molten metal injected into a mold and draws the molten metal to produce a cast piece,
On the upper part of the dummy bar head, a divided part is formed that is divided so as to be orthogonal to the slab drawing direction,
A thermal deformation absorbing means for absorbing thermal deformation due to the molten metal in each of the divided portions is provided.

The dummy bar head for continuous casting according to the second invention for solving the above-mentioned problems is
A continuous casting dummy bar head that solidifies and bonds with molten metal injected into a mold and draws the molten metal to produce a cast piece,
The dummy bar head is composed of divided members divided so as to be arranged in the slab width direction,
A thermal deformation absorbing means for absorbing thermal deformation caused by molten metal in each of the divided members is provided.

The dummy bar head for continuous casting according to the third invention for solving the above-mentioned problems is
In the continuous casting dummy bar head according to the second invention,
A connecting means for connecting the divided members in the slab width direction;
The thermal deformation absorbing means is arranged coaxially with the connecting means.

A dummy bar head for continuous casting according to a fourth invention for solving the above-mentioned problems is as follows.
In the continuous casting dummy bar head according to the second invention,
A fixing means for fixing each of the divided members;
The thermal deformation absorbing means is arranged between the divided members and the fixing means.

  According to the continuous casting dummy bar head according to the present invention, the dummy bar head has a divided structure, and includes the thermal deformation absorbing means for absorbing the thermal deformation caused by the molten metal in the divided dummy bar head, whereby the molten metal generated in the entire dummy bar head. Can be divided into small thermal deformations for each of the divided dummy bar heads. As a result, the small thermal deformation generated in the divided dummy bar head can be sufficiently absorbed by the thermal deformation absorbing means, so that the thermal deformation in the entire dummy bar head can be reduced. Therefore, since the gap generated between the mold and the dummy bar head can be suppressed, it is possible to prevent deterioration of the sealing performance of the molten metal.

  Hereinafter, the continuous casting dummy bar head according to the present invention will be described in detail with reference to the drawings. In addition, about the member which has the same structure and function in each Example, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 1 is a schematic configuration diagram of a continuous casting machine equipped with a dummy bar head according to the present invention, and FIG. 2 is a schematic diagram of a dummy bar head according to a first embodiment of the present invention, in which (a) is arranged in a mold. The plan view of the dummy bar head, (b) is a front view thereof, and (c) is a side view thereof.

  As shown in FIG. 1, the continuous casting machine 1 is provided with a cylindrical mold 12 having a rectangular cross section. A cooling circuit (not shown) that cools the casting mold 12 by circulating a cooling medium is provided inside the casting mold 12. A dummy bar head 21 provided at the tip of the dummy bar 13 is inserted into the lower opening of the mold 12. A seal member (not shown) that closes the gap between the mold 12 and the dummy bar head 21 is interposed between the inner wall of the lower opening of the mold 12 and the dummy bar head 21. Molten steel (molten metal) 11 is injected into the opening of the mold 12 whose upper surface is the pseudo bottom.

  Below the mold 12, a plurality of cooling means such as a cooling spray (not shown) and support rolls 14 are arranged in a circular arc shape at a predetermined interval. Thereby, a conveyance path for pulling out the dummy bar 13 is formed. A pair of upper and lower pinch rolls 15 are rotatably supported on the downstream side in the drawing direction of the conveyance path, and a driving device (not shown) is connected to the pinch roll 15. That is, by driving the driving device, the pinch roll 15 is rotationally driven, and the dummy bar 13 is pulled out.

  As shown in FIGS. 2 (a) to 2 (c), a slit (thermal deformation absorbing means) 31 extending in the thickness direction of the upper portion of the dummy bar head 21 has a predetermined cut amount, and A plurality (10 in FIG. 2) are formed at predetermined intervals in the width direction (longitudinal direction). Thus, by forming the slit 31, the upper portion of the dummy bar head 21 has a divided structure composed of a plurality (11 pieces in FIG. 2) of head portions (divided portions) 32. Further, an engaging member 33 protruding upward is provided on the upper surface of each head portion 32.

  Therefore, when the continuous casting machine 1 is operated, first, after the dummy bar head 21 of the dummy bar 13 is inserted into the lower opening of the mold 12, the mold having the upper surface of the dummy bar head 21 as the pseudo bottom from the upper opening. The molten steel 11 is injected into the 12 openings. When the bath surface of the molten steel 11 stored in the opening of the mold 12 reaches a predetermined height, the dummy bar head 21 is pulled out via the dummy bar 13 by the rotational drive of the pinch roll 15.

  At this time, the molten steel 11 to be stored is cooled by the inner wall of the mold 12 and solidified and coupled to the engaging member 33 of the dummy bar head 21, and the outside is covered with the solidified shell. By pulling out the dummy bar head 21 through the dummy bar 13 in this state, a slab having a cross-sectional shape substantially the same as the cross-sectional shape of the dummy bar head 21 is continuously manufactured.

  Next, the continuously drawn slab is further cooled by a cooling means such as a cooling spray as it is conveyed between the support rolls 14. Then, after solidification has progressed to the inside of the slab, this slab is cut into a predetermined length, thereby obtaining a steel strip (slab or strip) as a material in a subsequent process such as rolling.

  Here, at the start of continuous casting, the hot molten steel comes into contact with the upper surface of the dummy bar head, and the dummy bar head is thermally deformed. In particular, when manufacturing a thin slab, thermal deformation in the longitudinal direction of the dummy bar head, that is, the slab width direction of the dummy bar head increases. As a result, a gap is generated between the mold and the dummy bar head, and the molten steel leaks from the side of the dummy bar head, which may reduce the sealing performance of the molten steel.

  However, a slit 31 is formed in the upper part of the dummy bar head 21, and since the head portion 32 is formed by being divided by the slit 31, each head portion 32 is thermally deformed individually, and the thermal deformation is caused by the slit. 31 is absorbed. Thereby, the clearance gap produced between the casting_mold | template 12 and the dummy bar head 21 is suppressed, and the fall of the sealing performance of the molten steel 11 is prevented.

  Therefore, according to the dummy bar head for continuous casting according to the present invention, the upper portion of the dummy bar head 21 has a divided structure, and the slit 31 that absorbs the thermal deformation caused by the molten steel 11 in the divided head portion 32 is formed. The large thermal deformation caused by the molten steel 11 generated in the entire 21 can be divided into small thermal deformations for each of the divided head portions 32. As a result, the thermal deformation generated in the divided head portion 32 can be sufficiently absorbed by the slit 31, so that the thermal deformation in the entire dummy bar head 21 can be reduced. Thereby, since the clearance gap which generate | occur | produces between the casting_mold | template 12 and the dummy bar head 21 can be suppressed, the fall of the sealing performance of the molten steel 11 can be prevented.

  3A and 3B are schematic views of a dummy bar head according to a second embodiment of the present invention, in which FIG. 3A is a plan view of the dummy bar head disposed in the mold, and FIG. 3B is a front view thereof.

  The dummy bar head 22 shown in FIGS. 3 (a) and 3 (b) is further provided with slits (thermal deformation absorbing means) 34 extending in the width direction in each head portion 32 of the dummy bar head 21 shown in FIG. A plurality (two in FIG. 3) are formed at predetermined intervals in the thickness direction. The slit 34 is formed to have the same cutting amount as the slit 31. Thus, by forming the slit 34, the head portion 32 has a divided structure composed of a plurality of (three in FIG. 3) head portions (divided portions) 35.

  Therefore, when the molten steel 11 comes into contact with the upper surface of the dummy bar head 22 at the start of continuous casting, not only the thermal deformation in the width direction of the head portion 32 is absorbed, but also the thickness of the head portion 32 (head portion 35). Thermal deformation in the direction is also absorbed. Thereby, the gap in the thickness direction generated between the mold 12 and the dummy bar head 22 is also suppressed, and the deterioration of the sealing performance of the molten steel 11 is further prevented.

  Therefore, according to the dummy bar head for continuous casting according to the present invention, a plurality of slits 31 extending in the thickness direction are formed on the upper portion of the dummy bar head 22 at a predetermined interval in the width direction, and further extended in the width direction. By forming a plurality of slits 34 to be provided at predetermined intervals in the thickness direction, large thermal deformation caused by the molten steel 11 generated in the entire dummy bar head 22 can be divided into small thermal deformations for each of the divided head portions 32 and 35. it can. As a result, the thermal deformation generated in the divided head portions 32 and 35 can be sufficiently absorbed by the slits 31 and 34, so that the thermal deformation in the entire dummy bar head 22 can be reduced. Thereby, since the clearance gap which generate | occur | produces between the casting_mold | template 12 and the dummy bar head 22 can be suppressed, the fall of the sealing performance of the molten steel 11 can further be prevented.

  4A and 4B are schematic views of a dummy bar head according to a third embodiment of the present invention. FIG. 4A is a plan view of the dummy bar head disposed in the mold, and FIG. 4B is a front view thereof.

  As shown in FIGS. 4A and 4B, a dummy bar head 23 provided at the tip of the dummy bar 13 is inserted into the lower opening of the mold 12. The dummy bar head 23 has a divided structure including a plurality (11 pieces in FIG. 4) of head members (divided members) 41. The head member 41 is a quadrangular column having a substantially square cross section, and is arranged so that its long side extends in the vertical direction (drawing direction).

  The head member 41 is formed with through holes 42 penetrating between the vertical walls, and each head member 41 is arranged so that the through holes 42 extend in the width direction of the dummy bar head 23. Then, the bolts 43 are passed through the through holes 42 and both ends of the bolts 43 are fastened by the nuts 44 so that the head members 41 are integrated to form the dummy bar head 23. Further, a disc spring (thermal deformation absorbing means) 45 is interposed between one nut 44 and the head member 41, and the disc spring 45 is adjacent to each other by a biasing force in the width direction of the dummy bar head 23. The head members 41 are arranged in close contact with each other. Furthermore, an engaging member 46 protruding upward is provided on the upper surface of each head member 41.

  Note that the through hole 42, the bolt 43, the nut 44, and the like constitute connection means.

  Therefore, when the continuous casting machine 1 is operated, first, after inserting the dummy bar head 23 of the dummy bar 13 into the lower opening of the mold 12, the mold having the upper surface of the dummy bar head 23 as the pseudo bottom from the upper opening. The molten steel 11 is injected into the 12 openings. When the bath surface of the molten steel 11 stored in the opening of the mold 12 reaches a predetermined height, the dummy bar head 23 is pulled out via the dummy bar 13 by the rotational drive of the pinch roll 15.

  At this time, the molten steel 11 to be stored is cooled by the inner wall of the mold 12 to solidify and bond to the engaging member 46 of the dummy bar head 23, and the outside is covered with the solidified shell. By pulling out the dummy bar head 23 through the dummy bar 13 in this state, a slab having a cross-sectional shape substantially the same as the cross-sectional shape of the dummy bar head 23 is continuously manufactured.

  Next, the continuously drawn slab is further cooled by a cooling means such as a cooling spray as it is conveyed between the support rolls 14. Then, after solidification has progressed to the inside of the slab, this slab is cut into a predetermined length, thereby obtaining a steel strip (slab or strip) as a material in a subsequent process such as rolling.

  Further, when the molten steel 11 comes into contact with the upper surface of the dummy bar head 23 at the start of continuous casting, each head member 41 is individually thermally deformed, and the heat deformation is absorbed by contraction of the disc spring 45. Thereby, the clearance gap produced between the casting_mold | template 12 and the dummy bar head 23 is suppressed, and the fall of the sealing performance of the molten steel 11 is prevented.

  Therefore, according to the dummy bar head for continuous casting according to the present invention, the entire dummy bar head 23 has a divided structure in which a plurality of head members 41 arranged in the width direction are connected using bolts 43 and nuts 44, By urging the head member 41 from the width direction by the spring 45, a large thermal deformation caused by the molten steel 11 generated in the entire dummy bar head 23 can be divided into small thermal deformations for each divided head member 41. As a result, the thermal deformation generated in the divided head member 41 can be sufficiently absorbed by the disc spring 45, so that the thermal deformation in the entire dummy bar head 23 can be reduced. Thereby, since the clearance gap which generate | occur | produces between the casting_mold | template 12 and the dummy bar head 23 can be suppressed, the fall of the sealing performance of the molten steel 11 can be prevented.

  5A and 5B are schematic views of a dummy bar head according to a fourth embodiment of the present invention, in which FIG. 5A is a plan view of the dummy bar head disposed in the mold, FIG. 5B is a front view thereof, and FIG. It is a side view.

  As shown in FIGS. 5A to 5C, a dummy bar head 24 provided at the tip of the dummy bar 13 is inserted into the lower opening of the mold 12. The dummy bar head 24 is formed with a dovetail groove 51 extending in the width direction (longitudinal direction) and a plurality of slits (thermal deformation absorbing means) 52 extending in the thickness direction at predetermined intervals in the width direction. (10 in FIG. 5) are formed.

  The dovetail 51 has an upper opening 51a that opens to the upper surface of the dummy bar head 24, and a lower opening 51b that communicates with the lower portion of the upper opening 51a. The length (thickness) in the thickness direction of the dummy bar head 24 in the lower opening 51b is longer (thicker) than the length (thickness) in the upper opening 51a. The slit 52 is formed deeper than the bottom surface of the lower opening 51b of the dovetail 51. By forming the slit 52 in this way, the upper portion of the dummy bar head 24 is a plurality of (11 in FIG. 5) heads. It has a divided structure composed of parts (divided parts) 54.

  Therefore, when the continuous casting machine 1 is operated, first, the dummy bar head 24 of the dummy bar 13 is inserted into the lower opening of the mold 12, and then the mold having the upper surface of the dummy bar head 24 as the pseudo bottom from the upper opening. The molten steel 11 is injected into the 12 openings. When the bath surface of the molten steel 11 stored in the opening of the mold 12 reaches a predetermined height, the dummy bar head 24 is pulled out via the dummy bar 13 by the rotational drive of the pinch roll 15.

  At this time, the molten steel 11 to be stored is cooled by the inner wall of the mold 12, so that it solidifies and joins in the dovetail groove 51 of the dummy bar head 24, and the outside is covered with the solidified shell. By pulling out the dummy bar head 24 through the dummy bar 13 in this state, a slab having a cross-sectional shape substantially the same as the cross-sectional shape of the dummy bar head 24 is continuously manufactured.

  Next, the continuously drawn slab is further cooled by a cooling means such as a cooling spray as it is conveyed between the support rolls 14. Then, after solidification has progressed to the inside of the slab, this slab is cut into a predetermined length, thereby obtaining a steel strip (slab or strip) as a material in a subsequent process such as rolling.

  In addition, when the molten steel 11 comes into contact with the upper surface of the dummy bar head 24 at the start of continuous casting, since the head portion 54 is formed by being divided by the slit 52 at the upper portion of the dummy bar head 24, each head portion 54 is provided. Individual thermal deformations are absorbed by the slits 52. Thereby, the clearance gap produced between the casting_mold | template 12 and the dummy bar head 24 is suppressed, and the fall of the sealing performance of the molten steel 11 is prevented.

  Therefore, according to the dummy bar head for continuous casting according to the present invention, the upper portion of the dummy bar head 24 has a divided structure, and the slit 52 that absorbs the thermal deformation caused by the molten steel 11 in the divided head portion 54 is formed. The large thermal deformation caused by the molten steel 11 generated in the whole 24 can be divided into small thermal deformations for each divided head portion 54. As a result, the thermal deformation generated in the divided head portion 54 can be sufficiently absorbed by the slit 52, so that the thermal deformation in the entire dummy bar head 24 can be reduced. Thereby, since the clearance gap which generate | occur | produces between the casting_mold | template 12 and the dummy bar head 24 can be suppressed, the fall of the sealing performance of the molten steel 11 can be prevented.

  6A and 6B are schematic views of a dummy bar head according to a fifth embodiment of the present invention, wherein FIG. 6A is a plan view of the dummy bar head arranged in the mold, FIG. 6B is a front view thereof, and FIG. It is a figure which shows the removal structure from the slab in the dummy bar head which has this.

  The dummy bar head 25 shown in FIGS. 6A and 6B is further provided with slits (thermal deformation absorbing means) 53 extending in the width direction in the head portions 54 at both ends of the dummy bar head 24 shown in FIG. Is formed in the middle part in the thickness direction. The slit 53 is formed to have the same cutting amount as the slit 52. Thus, by forming the slits 53, the head portions 54 at both ends have a divided structure composed of a plurality (two in FIG. 6) of head portions (divided portions) 55. A plurality of slits 53 may be formed at predetermined intervals in the thickness direction.

  Therefore, when the molten steel 11 comes into contact with the upper surface of the dummy bar head 25 at the start of continuous casting, not only the thermal deformation in the width direction of the head portion 54 is absorbed but also the heat in the thickness direction of the head portions 55 at both ends. Deformation is also absorbed. Thereby, the gap in the thickness direction generated between the mold 12 and the dummy bar head 25 is also suppressed, and the deterioration of the sealing performance of the molten steel 11 is further prevented.

  Therefore, according to the dummy bar head for continuous casting according to the present invention, a plurality of slits 52 extending in the thickness direction are formed at an upper portion of the dummy bar head 25 at a predetermined interval in the width direction, and further extended in the width direction. By forming the slit 53 to be provided in the middle portion in the thickness direction, the large thermal deformation caused by the molten steel 11 generated in the entire dummy bar head 25 can be divided into small thermal deformations for each of the divided head portions 54 and 55. As a result, the thermal deformation generated in the divided head portions 54 and 55 can be sufficiently absorbed by the slits 52 and 53, so that the thermal deformation in the entire dummy bar head 25 can be reduced. Thereby, since the clearance gap which generate | occur | produces between the casting_mold | template 12 and the dummy bar head 25 can be suppressed, the fall of the sealing performance of the molten steel 11 can further be prevented.

  When the slab is pulled out using the dovetail groove 51 as in the dummy bar heads 24 and 25, as shown in FIG. 7, the dummy bar heads 24 and 25 are divided at intermediate portions in the thickness direction, and bolts 71 and nuts are separated. The divided half members 24a, 24b and 25a, 25b may be configured to be removable by fastening means such as 72. Thereby, after continuous casting, the dummy bar heads 24 and 25 and the slab can be easily separated by removing the bolt 71 and the nut 72. In addition, if the detachment structure is used as described above, the dummy bar heads 24 and 25 can be reused even if the dovetail groove 51 is provided.

  8A and 8B are schematic views of a dummy bar head according to a sixth embodiment of the present invention. FIG. 8A is a plan view of the dummy bar head disposed in the mold, FIG. 8B is a front view thereof, and FIG. It is an enlarged view of the width direction center part of the dummy bar head in (b).

  As shown in FIGS. 8A and 8B, a dummy bar head 26 provided at the tip of the dummy bar 13 is inserted into the lower opening of the mold 12. The dummy bar head 26 has a divided structure including a plurality (11 pieces in FIG. 8) of head members (divided members) 61. The head member 61 is a quadrangular prism having a substantially square cross section, and is arranged so that its long side extends in the vertical direction (drawing direction).

  The dummy bar head 26 is formed with dovetail grooves 62 extending in the width direction (longitudinal direction). That is, the dovetail grooves 62 are formed in series in the arranged head members 61. The dovetail groove 62 has an upper opening 62a that opens to the upper surface of the dummy bar head 26, and a lower opening 62b that communicates with the lower portion of the upper opening 62a. The length (thickness) in the thickness direction of the dummy bar head 26 in the lower opening 62b is formed longer (thicker) than the length (thickness) in the upper opening 62a.

  As shown in FIGS. 8B and 9, a fixing member 63 is provided below the arranged head members 61. The fixing member 63 is formed with attachment holes 64 that open to the lower surface thereof, corresponding to the head members 61. The mounting hole 64 corresponding to the head member 61 disposed in the center communicates with the bolt hole 65 opened on the upper surface of the fixing member 63, while the head member 61 disposed outside the central head member 61. A long hole (thermal deformation absorbing means) 66 that opens on the upper surface of the fixing member 63 communicates with the mounting hole 64 corresponding to. Then, the bolts 67 and 68 are fastened to the lower portions of the respective head members 61 through the bolt holes 65 and the long holes 66 of the fixing member 63, so that each head member 61 is integrated with the fixing member 63 to be a dummy bar head. 26 is configured.

  Here, the long hole 66 of the fixing member 63 has a long diameter in the same direction as the width direction of the dummy bar head 26. The length of the long diameter of each long hole 66 is formed to become gradually longer as it is arranged on the outer side than the bolt hole 65 arranged at the center. The bolt 68 corresponding to the head member 61 fixed to the outside is penetrated into the long hole 66 of the fixing member 63 via the disc spring 69, and the outer diameter of the disc spring 69 is set to the length of each long hole 66. It is formed larger than the major axis.

  The fixing member 63, the bolts 67 and 68, the disc spring 69, and the like constitute fixing means.

  Therefore, when the continuous casting machine 1 is operated, first, after inserting the dummy bar head 26 of the dummy bar 13 into the lower opening of the mold 12, the mold having the upper surface of the dummy bar head 26 as the pseudo bottom from the upper opening. The molten steel 11 is injected into the 12 openings. When the bath surface of the molten steel 11 stored in the opening of the mold 12 reaches a predetermined height, the dummy bar head 26 is pulled out via the dummy bar 13 by the rotational drive of the pinch roll 15.

  At this time, the molten steel 11 to be stored is cooled by the inner wall of the mold 12 and solidified and bonded in the dovetail groove 62 of the dummy bar head 26, and the outside is covered with the solidified shell. By pulling out the dummy bar head 26 through the dummy bar 13 in this state, a slab having a cross-sectional shape substantially the same as the cross-sectional shape of the dummy bar head 26 is continuously manufactured.

  Next, the continuously drawn slab is further cooled by a cooling means such as a cooling spray as it is conveyed between the support rolls 14. Then, after solidification has progressed to the inside of the slab, this slab is cut into a predetermined length, thereby obtaining a steel strip (slab or strip) as a material in a subsequent process such as rolling.

  When the molten steel 11 comes into contact with the upper surface of the dummy bar head 26 at the start of continuous casting, each head member 61 is individually thermally deformed. Here, the head member 61 fixed to the center by the bolt 67 is thermally deformed at the fixing position. On the other hand, the head member 61 fixed to the outer side by the bolt 68 is thermally deformed while moving outward in the width direction of the dummy bar head 26 due to the thermal deformation of the inner head member 61. Thereby, the clearance gap produced between the casting_mold | template 12 and the dummy bar head 26 is suppressed, and the fall of the sealing performance of the molten steel 11 is prevented.

  At this time, when the head member 61 fixed to the outside of the head member 61 moves (thermally deforms), the bolts 68 for fixing the head member 61 are tilted outward in the width direction of the dummy bar head 26 and slip between the head member 61. However, since the long hole 66 having a long diameter in the width direction is formed in the fixing member 63, the tilt of the bolt 68 and the slip between the head member 61 are allowed. Thereby, the thermal deformation of the head member 61 can be absorbed. Further, the movement amount of the head member 61 arranged on the outer side of the central head member 61 increases, but the longer diameter of the long hole 66 becomes gradually longer as the head member 61 is arranged on the outer side of the central head member 61. Since it is formed as described above, it is possible to cope with the movement.

  In the present embodiment, the head member 61 fixed via the bolt hole 65 is disposed at the center in the width direction of the dummy bar head 26, but the present invention is not limited to this position. That is, if the long diameter of the long hole 66 formed inside and outside the bolt hole 65 is gradually increased as the distance from the bolt hole 65 is increased, the head member 61 fixed through the bolt hole 65 is located at any position. You can fix it. Of course, the dummy bar head 26 is not divided into an odd number but can be applied to an even number.

  Therefore, according to the dummy bar head for continuous casting according to the present invention, the entire dummy bar head 26 is divided by fixing the lower ends of the plurality of head members 61 arranged in the width direction using bolts 67 and 68 to the fixing member 63. A large thermal deformation caused by the molten steel 11 generated in the entire dummy bar head 26 is obtained by fixing the head member 61 arranged outside the central head member 61 with a bolt 68 through the long hole 66 of the fixing member 63. Can be divided into small thermal deformations for each of the divided head members 61. As a result, the thermal deformation generated in the divided head member 61 can be sufficiently absorbed by the long hole 66 of the fixing member 63, so that the thermal deformation in the entire dummy bar head 26 can be reduced. Thereby, since the clearance gap which generate | occur | produces between the casting_mold | template 12 and the dummy bar head 26 can be suppressed, the fall of the sealing performance of the molten steel 11 can further be prevented.

  In each of the above-described embodiments, the widths of the slits 31, 34, 52, and 53 are formed so that the molten steel 11 does not enter, and for example, 0.2 mm or less is desirable. Further, the divided widths of the divided head portions 32 and 54 are formed so that thermal deformation does not increase, and for example, 30 mm or less is desirable. The continuous casting dummy bar according to the present invention is applied to a mold type continuous casting machine. However, the present invention is not limited to this. For example, the continuous casting dummy bar may be applied to a belt type or twin drum type continuous casting machine. Absent.

  The present invention can be applied to a piston member for extruding a high-temperature fluid stored in a cylindrical member to the outside of the cylinder.

It is a schematic block diagram of the continuous casting machine provided with the dummy bar head which concerns on this invention. It is the schematic of the dummy bar head based on 1st Example of this invention, Comprising: (a) is a top view of the dummy bar head arrange | positioned in a casting_mold | template, (b) is the front view, (c) is the side view. is there. It is the schematic of the dummy bar head concerning 2nd Example of this invention, Comprising: (a) is a top view of the dummy bar head arrange | positioned in a casting_mold | template, (b) is the front view. It is the schematic of the dummy bar head based on 3rd Example of this invention, Comprising: (a) is a top view of the dummy bar head arrange | positioned in a casting_mold | template, (b) is the front view. It is the schematic of the dummy bar head based on 4th Example of this invention, Comprising: (a) is a top view of the dummy bar head arrange | positioned in a casting_mold | template, (b) is the front view, (c) is the side view. is there. It is the schematic of the dummy bar head based on 5th Example of this invention, (a) is a top view of the dummy bar head arrange | positioned in a casting_mold | template, (b) is the front view. It is a figure which shows the removal structure from the slab in the dummy bar head which has a dovetail. It is the schematic of the dummy bar head based on 6th Example of this invention, Comprising: (a) is a top view of the dummy bar head arrange | positioned in a casting_mold | template, (b) is the front view. It is an enlarged view of the width direction center part of the dummy bar head in FIG.8 (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Continuous casting machine 11 Molten steel 12 Mold 13 Dummy bar 14 Support roll 15 Pinch roll 21-26 Dummy bar head 31,34,52,53 Slit 32,35,54,55 Head part 33,46 Engagement member 41,61 Head member 42 Through hole 43, 67, 68 Bolt 44 Nut 45, 69 Disc spring 51, 62 Dovetail groove 63 Fixing member 64 Mounting hole 65 Bolt hole 66 Long hole 71 Bolt 72 Nut

Claims (4)

A continuous casting dummy bar head that solidifies and bonds with molten metal injected into a mold and draws the molten metal to produce a cast piece,
On the upper part of the dummy bar head, a divided part is formed that is divided so as to be orthogonal to the drawing direction of the slab
A continuous casting dummy bar head comprising thermal deformation absorbing means for absorbing thermal deformation caused by molten metal in each of the divided portions. A continuous casting dummy bar head that solidifies and bonds with molten metal injected into a mold and draws the molten metal to produce a cast piece,
The dummy bar head is composed of divided members divided so as to be arranged in the width direction of the slab,
A dummy bar head for continuous casting, comprising thermal deformation absorbing means for absorbing thermal deformation due to molten metal in each of the divided members. The dummy bar head for continuous casting according to claim 2,
A connecting means for connecting the divided members in the width direction of the slab,
The dummy bar head for continuous casting, wherein the thermal deformation absorbing means is arranged coaxially with the connecting means. The dummy bar head for continuous casting according to claim 2,
A fixing means for fixing each of the divided members;
The continuous deformation dummy bar head, wherein the thermal deformation absorbing means is disposed between the divided members and the fixing means.

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