JP5462640B2 - Molten metal passing nozzle and manufacturing method thereof - Google Patents

Description

  The present invention relates to a molten metal passage nozzle such as an immersion nozzle that allows a molten metal (including molten steel) to pass therethrough and a method for manufacturing the same.

  A molten metal passage nozzle represented by an immersion nozzle is formed of a refractory material extending along the axial length direction, and has a cylindrical refractory layer having a molten metal passage hole along the axial length direction, and a refractory layer layer. And an iron skin covering the upper end (Patent Documents 1 and 2). Here, in the molten metal passage nozzle, the molten metal may be inserted into the refractory layer, and there has been a limit to extending the life.

JP 05-057410 A Japanese Patent Laid-Open No. 05-329592

  The present invention has been made in view of the above-described circumstances, and provides a molten metal passage nozzle that is advantageous for suppressing the insertion of a molten metal such as molten steel into the refractory layer and extending the life of the refractory layer, and a method for manufacturing the nozzle. The issue is to provide.

  (1) The molten metal passage nozzle according to the present invention is (i) a refractory layer that is formed of a refractory material extending along the axial length direction and has a tubular shape having a molten metal passage hole along the axial length direction; (Ii) In the molten metal passage nozzle comprising an iron skin covering the upper end of the refractory layer, (iii) the refractory portion covered by at least the iron skin of the refractory layer is accompanied by a temperature rise during use. It is characterized by being compressed in the axial length direction in the normal temperature region so that the amount of thermal expansion in the axial length direction can be increased. According to the molten metal passage nozzle according to the present invention, at least a portion of the refractory material covered by the iron skin in the refractory material layer is in a compressed state in the axial length direction in the normal temperature region. For this reason, when the molten metal passage nozzle is heated and heated from a normal temperature region to a high temperature during use, the amount of thermal expansion of the refractory layer in the axial length direction increases. For this reason, even when a gap occurs in the refractory layer, the amount of thermal expansion of the refractory layer is ensured satisfactorily, so that the generation of a gap in the refractory layer is suppressed. For this reason, the insertion of the molten metal into the refractory layer is suppressed, and the life of the molten metal passage nozzle can be extended.

  (2) The manufacturing method of the molten metal passage nozzle according to the present invention includes: (i) a refractory material that is formed of a refractory material that extends along the axial length direction and has a molten metal passage hole along the axial length direction. A step of preparing a material having a layer and an iron skin covering the upper end of the refractory layer, and (ii) heating to thermally expand the iron skin in the axial length direction by heating at least a part of the iron skin And (iii) the iron skin heated in the heating step is cooled and thermally contracted in the axial length direction, so that the refractory layer is covered with the iron shell portion that has been cooled and thermally contracted after heating. And a cooling step of compressing the refractory portion in the axial length direction in the normal temperature region so that the amount of thermal expansion in the axial length direction can be increased as the temperature rises during use. According to the manufacturing method according to the present invention, in the heating step, at least a part of the iron skin is heated to thermally expand the iron skin in the axial length direction. In the subsequent cooling process, the iron skin heated in the heating process is cooled and thermally contracted in the axial direction. Thereby, among the refractory layers, the refractory portion covered by the iron shell portion that has been cooled and thermally contracted after heating is compressed in the axial length direction. As a result, at least a portion of the refractory layer covered with the iron skin in the refractory layer is compressed in the axial length direction in the normal temperature region.

  For this reason, when the molten metal passage nozzle is heated from the normal temperature region to a high temperature and thermally expands in the axial length direction during use, the amount of thermal expansion in the axial length direction of the refractory portion covered with the iron shell increases. As a result, the amount of thermal expansion in the axial length direction of the refractory layer increases. For this reason, even when gaps and cracks occur in the refractory layer, the amount of thermal expansion in the axial direction of the refractory layer is ensured well, so the occurrence of gaps and cracks in the refractory layer is suppressed. Is done. For this reason, the insertion of the molten metal into the refractory layer is suppressed, and the life of the molten metal passage nozzle can be extended.

  According to the present invention, when the molten metal passage nozzle is used and heated to a high temperature state, the amount of thermal expansion of the refractory layer is good even when gaps or cracks occur in the refractory layer. Therefore, the generation of gaps and cracks in the refractory layer is suppressed. For this reason, due to the occurrence of gaps and cracks, insertion of the molten metal into the refractory layer is suppressed. Therefore, the lifetime of the molten metal passage nozzle can be extended.

FIG. 4 is a cross-sectional view of a molten metal passage nozzle according to the first embodiment. 4 is a cross-sectional view of a main refractory layer according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view of an iron skin having a secondary refractory layer according to the first embodiment. It is sectional drawing of the state which concerns on Embodiment 1 and was installed in the installation surface of the base in the state which turned upside down the iron skin which has a sub-refractory layer. It is sectional drawing which shows the manufacturing process which concerns on Embodiment 1 and inserts a main refractory layer in the iron skin turned upside down, and couple | bonds a ring body, a 1st iron skin, and a 2nd iron skin by welding. It is sectional drawing which concerns on Embodiment 2 and shows the manufacturing process which inserts a main refractory layer in the iron skin turned upside down, and couple | bonds a ring body, a 1st iron skin, and a 2nd iron skin by welding.

  According to a preferred embodiment of the present invention, the iron skin includes a first iron skin, a second iron skin disposed below the first iron skin, and the first iron skin and the second iron skin in the axial direction. And a ring body that connects the first iron skin and the second iron skin. In this case, the first iron skin is compressed in the axial length direction in the normal temperature region, and at least the refractory portion covered by the first iron skin of the refractory layer is in the axial length direction in the normal temperature region. In the compressed state. For this reason, when the molten metal passage nozzle is heated to a high temperature during use and thermally expands in the axial length direction, the amount of thermal expansion in the axial length direction of the refractory part covered with the iron shell increases, and as a result, the refractory layer The amount of thermal expansion in the axial length direction increases.

  According to a preferred embodiment of the present invention, the refractory layer includes a main refractory layer extending in the axial length direction and a secondary refractory layer provided on the upper side of the main refractory layer, and the iron skin is the main refractory layer. It covers the upper end of the material layer and the auxiliary refractory layer provided on the upper side. According to a preferred embodiment of the present invention, the iron skin includes a first iron skin that covers the refractory portion, a second iron skin that is disposed below the first iron skin and covers the refractory portion, and the axial length in the axial direction. A ring body provided between the first iron skin and the second iron skin and connecting the first iron skin and the second iron skin; In this case, the heating step is a step in which the first iron skin is heated and thermally expanded in the axial length direction while being assembled in a state where the first iron skin and the second iron skin are combined via the ring body. In the cooling step, the high-temperature first iron skin heated in the heating step is cooled and thermally contracted in the axial length direction. Thereby, among the refractory layers, the refractory portion covered by the iron core portion of the first iron skin that has been cooled and thermally shrunk after heating is compressed in the axial length direction.

(Embodiment 1)
Embodiments of the present invention will be described below. FIG. 1 shows the concept of the first embodiment. The molten metal passage nozzle can be used as an immersion nozzle immersed below the molten metal surface M1, and has a cylindrical shape formed of a refractory material and a metal (generally covering the top of the refractory material layer 1). Has a metal shell made of iron material) and an iron skin 4 that functions as a protective shell. The refractory is not particularly limited, and examples thereof include alumina, silica, and magnesia. As shown in FIG. 1, the refractory layer 1 is extended along the axial length direction of this, The cylindrical shape which has the molten metal passage hole 10 along the axial length direction (arrow P direction) in the center part. Eggplant. The refractory layer 1 includes a main refractory layer 11 extending in the axial length direction (arrow P direction) and having a hole 10a, and a sub-refractory layer 13 having a hole 10c provided above the main refractory layer 11. ing. The holes 10 a and 10 c communicate with each other to form a molten metal passage hole 10. The main refractory layer 11 and the sub refractory layer 13 are formed by assembling a plurality of regular bricks via mortar or the like, but may be castable depending on circumstances. The main refractory layer 11 inevitably has a plurality of fine pores in the manufacturing process. If the fine pores disappear due to compression, the main refractory layer 11 is densified.

  FIG. 2 shows the main refractory layer 11. As shown in FIG. 2, a large-diameter head portion 110 having an outer diameter larger than the outer diameter of the lower portion of the main refractory layer 11 is formed on the upper portion of the main refractory layer 11. The head portion 110 has a thick cylindrical shape, and has a conical ring-shaped widening inclined surface 112 that goes around the axis P1. As shown in FIG. 2, the expansion inclined surface 112 faces obliquely downward, and is inclined in a conical shape so as to move upward as it goes in the radially outward direction (arrow D1 direction). The main refractory layer 11 and the auxiliary refractory layer 13 are separated from each other in the manufacturing process. As shown in FIG. 1, a sliding nozzle device 100 </ b> A is provided on the upper side of the auxiliary refractory layer 13. The sliding nozzle device 100 </ b> A includes a slide plate 102 having a nozzle 101 for facing the molten metal passage hole 10 and a fixed plate 104 having a nozzle 103 capable of facing the upper portion of the molten metal passage hole 10. When the slide plate 102 moves in the arrow X direction (nozzle opening / closing direction), it is possible to switch between the passage of the molten metal in the nozzles 101 and 103 and the blocking of the molten metal. Therefore, the auxiliary refractory layer 13 is preferably formed of a refractory material that can slide the slide plate 102 satisfactorily. The sliding nozzle device 100A may be a two-sheet type or a three-sheet type. As shown in FIG. 1, the iron skin 4 covers the upper end portion of the main refractory layer 11 and the auxiliary refractory layer 13. Specifically, as shown in FIG. 1, the iron skin 4 includes a first iron skin 41 made of an upper metal (generally an iron material) that covers the auxiliary refractory layer 13, and a first iron skin 41. It has a cylindrical second iron skin 42 made of metal (generally iron material) and a ring body 43 made of metal (generally iron material) that goes around the axis P1. .

  As shown in FIG. 1 showing the time of use, the second iron skin 42 covers the outer periphery of the main refractory layer 11 on the lower side of the head 110 in the main refractory layer 11. The second iron skin 42 has an expanding inclined part 420 at the upper part thereof. The expansion inclined portion 420 has a ring shape that makes one turn around the axis P <b> 1 so as to cover the conical expansion inclined surface 112 of the head 110. In FIG. 1, the outer peripheral surface 420c of the expanding inclined portion 420 faces obliquely downward, and is inclined in a conical shape so as to move upward as it goes in the radially outward direction (arrow D1 direction).

  The ring body 43 has high rigidity and is provided coaxially between the first iron skin 41 and the second iron skin 42 in the axial length direction (arrow P direction). The lower end portion of the first iron skin 41, the upper end portion of the second iron skin 42, and the ring body 43 are connected by a welded portion 49. Therefore, the 1st iron skin 41, the 2nd iron skin 42, and the ring body 43 are integrated. The welded portion 49 may have a structure that makes one round in the circumferential direction, or may have a structure that is provided in the form of dots in the circumferential direction. In short, the first iron skin 41, the second iron skin 42, and the ring body 43 are integrated at the welded portion 49. As shown in FIG. 1, the ring body 43 has an engagement surface 43 m for mechanically engaging with an expanded inclined surface 112 that is an outer peripheral surface of the head portion 110 of the main refractory layer 11. In FIG. 1 showing the use state, the engagement surface 43m makes one round around the axis P1 and is inclined in a conical shape so as to move upward as it goes in the radially outward direction (arrow D1 direction). The engagement surface 43m of the ring body 43 enhances the supportability and suspension of the main refractory layer 11. Furthermore, the engaging surface 43m formed on the upper part of the second iron skin 42 fixed to the main refractory layer 11 has a conical shape, and the conical expanding inclined surface 112 of the head 110, the second 2 It mechanically engages with the expanding inclined portion 420 having the conical shape of the iron skin 42. For this reason, the ring body 43 can exhibit the function to align the main refractory layer 11 in the radial direction (arrow D1 direction).

  Here, as shown in FIG. 1, the first iron skin 41 includes a shallow wide-mouthed plate portion 410 having a cylindrical shape or a rectangular tube shape, and an extension extending in a cylindrical shape downward from the plate portion 410. And a cylindrical portion 430. The plate part 410 and the extended cylinder part 430 are integrated. The first iron skin 41 covers the head 110 which is the upper end of the main refractory layer 11 and the sub-refractory layer 13. The main refractory layer 11 and the sub refractory layer 13 are adjacent to each other through these boundary regions 15x. The surface 100s of the head 110 of the main refractory layer 11 and the surface 13s of the sub refractory layer 13 are formed so that no gap 15 is generated in the boundary region 15x between the main refractory layer 11 and the sub refractory layer 13. The thin refractory layer 115 (for example, a mortar layer or the like) having a high sealing property is intimately assembled. This is because the molten metal is inserted when the gap 15 is generated. The refractory layer 1 has a molten metal passage hole 10 through which the molten metal passes by gravity. The molten metal passage hole 10 has a vertical passage hole 10e extending in the axial direction and a horizontal passage hole 10d communicating with the lower portion of the vertical passage hole 10e and discharging the molten metal. The outer peripheral wall 119 of the main refractory layer 11 is preferably covered with the ceramic sheet 10x.

  Now, according to the present embodiment, the refractory portion covered by at least the iron skin 4 of the refractory layer 1 has an axial length in a normal temperature region (generally 0 ° C. to 40 ° C., 10 to 30 ° C.). Pressurized in the direction (arrow P direction) to be in a compressed state. Specifically, the refractory portion (head 110) covered by at least the first iron skin 41 in the main refractory layer 11 is compressed in the axial length direction (arrow P direction) in the normal temperature region. Yes. More specifically, the refractory portion (head portion 110) covered by at least the extending cylindrical portion 430 of the first iron skin 41 in the main refractory layer 11 has an axial length direction (arrow P direction) in the normal temperature region. ) In a compressed state and densified.

  Next, the manufacturing process will be described. As shown in FIG. 4, the cylindrical first iron skin 41 (material) in which the auxiliary refractory layer 13 is embedded is vertically inverted and installed on the horizontal installation surface 90 of the base 9. In this case, the auxiliary refractory layer 13 is placed on the installation surface 90 of the base 9. In this case, the cylindrical opening 41w of the first iron skin 41 is directed upward. As shown in FIG. 5, the main refractory layer 11 (material) having a cylindrical shape is directed downward, and the head portion 110 of the main refractory layer 11 is lowered from the cylindrical opening 41 w of the first iron skin 41 ( Inserted in the direction of arrow U), and between the outer peripheral wall surface 110c of the head portion 110 of the main refractory layer 11 and the inner peripheral wall surface 430c of the extended cylindrical portion 430 of the first iron skin 41, the loading material 48 (heat resistance) Binder material with heat resistance and sealing material with heat resistance). The loading material 48 may be a mortar material, a castable material, or a refractory powder material. In this case, the head 110 of the main refractory layer 11 and the auxiliary refractory layer 13 have a high sealing property so that no gap is generated in the boundary region 15x between the main refractory layer 11 and the auxiliary refractory layer 13. And intimate contact through a refractory layer 115 having heat resistance.

  Next, as shown in FIG. 5, the ring body 43 is formed on the loading material 48, the conical ring-shaped widening inclined surface 112 of the head 110, and the conical ring-shaped widening inclined portion 420 of the second iron skin 42. The ring body 43 is mounted almost coaxially from above, with the engagement surface 43m facing downward so that the engagement surface 43m engages. The engagement surface 43m of the ring body 43 is inclined at an angle θ2 (reference) with respect to the axis P1. The angle θ2 can be, for example, in the range of 85 to 5 °, in the range of 80 to 10 °, in the range of 75 to 15 °, and in the range of 70 to 20 °. Here, the ring body 43 has high rigidity and forms an O-shaped ring shape or a C-shaped ring shape that makes one round around the axis P1, but may be a semi-ring shape. You may use a half ring body of 1/2 circumference as a set. Thereafter, in a normal temperature region (generally 0 to 30 ° C.), the lower surface 93d of the rod-shaped pressurizing body 93 is applied to the ring body 43 from the upper side toward the arrow U direction (downward) along the axial length direction. The posture of the main refractory layer 11 (which may be fired or non-fired) is stabilized. The head 110 and the auxiliary refractory layer of the main refractory layer 11 are prevented from generating a gap in the boundary region 15x between the main refractory layer 11 and the auxiliary refractory layer 13 by the strong pressure action of the pressurizing body 93. 13 is closely contacted through a refractory layer 115 (for example, mortar material) having high sealing performance. In this state, the extending cylinder part 430 of the first iron skin 4 is heated to a high temperature state by the heating element 8 arranged outside the extending cylinder part 430 of the first iron skin 4. Thereby, the extended cylinder part 430 of the 1st iron skin 4 is thermally expanded in an axial length direction (arrow P direction). The amount of thermal expansion is not particularly limited. If the axial length dimension of the extended cylinder part 430 before heating is L1, and the axial length dimension of the extended cylinder part 430 before heating is L2, L2 / Examples include L1 × 100 = 101 to 130, 102 to 120, 103 to 115, and 103 to 110. In the axial direction, it is possible to heat particularly the vicinity of the ring body 43 in the extended tube portion 430. Examples of the heating element 8 include a combustion flame burner (for example, acetylene burner flame), an electric heater, an induction heating coil, and the like. 200-1100 degreeC, 300-900 degreeC, 350-800 degreeC etc. are illustrated as a heating temperature of the extension cylinder part 430. FIG. The heating atmosphere may be an air atmosphere, a reducing atmosphere, or a reduced pressure atmosphere.

  As described above, with the extended cylindrical portion 430 of the first iron skin 4 heated to a high temperature state and thermally expanded in the axial length direction (arrow P direction), the first iron skin 4 and the second iron skin 4 The ring body 43 is integrally coupled with the welded portion 49 (see FIG. 1). As described above, the extending cylindrical portion 430 of the first iron skin 4 is restrained in a state of being thermally expanded in the axial length direction. The welded portion 49 may be formed in a ring shape around the axis line P1, or may be formed in a ring shape around the axis line P1. After that, when the iron skin 4 is cooled to the normal temperature region, the extended cylindrical portion 430 of the first iron skin 41 is thermally contracted in the axial length direction (arrow P direction). As a result, the refractory portion of the main refractory layer 11 that is close to the sub-refractory layer 13, that is, the head portion 110 and / or the loading material 48, along with the extended cylindrical portion 430 of the first iron skin 41, has an axial length. The heat shrinks in the direction (arrow P direction), and is finally compressed in the axial length direction (arrow P direction).

  Next, a description will be given regarding the use. As shown in FIG. 1, when the molten metal passage nozzle is used, the iron skin 4 is positioned above the refractory layer 1. When the molten metal passage nozzle is used, the lower portion of the molten metal passage nozzle is immersed in the molten metal (generally molten steel) or approaches the molten metal. Further, the high temperature molten metal passes through the molten metal passage hole 10. For this reason, the molten metal passage nozzle is heated to a high temperature under the influence of the temperature of the molten metal. Here, when the molten metal passage nozzle is heated to a high temperature and thermally expands in the axial length direction, as described above, the refractory portion (the head 110 and / or the head portion 110 and / or the refractory layer 1 covered with at least the iron shell 4). Alternatively, the loading material 48) is in a compressed state in the axial length direction (arrow P direction) in the normal temperature region. For this reason, when the main refractory layer 11 and / or the loading material 48 are heated and heated during use, the axial direction of the head 110 of the main refractory layer 11 and / or the loading material 48 (the direction of the arrow P) ) Increases in thermal expansion.

  According to this embodiment, in the unlikely event of use, a minute gap 15 is generated between the main refractory layer 11 and the auxiliary refractory layer 13 in the refractory layer 1. However, when the temperature of the molten metal passage nozzle is raised during use, the main refractory layer 11 and / or the amount of thermal expansion in the axial length direction (arrow P direction) of the loading material 48, particularly the main refractory layer 11 and The amount of thermal expansion of the part covered with the extended cylindrical part 430 of the cylindrical iron skin 4 cylindrical shape in the loaded material 48 is ensured satisfactorily. For this reason, generation | occurrence | production of the clearance gap 15 is suppressed in the boundary area 15x of the main refractory layer 11 and the sub refractory layer 13. FIG. Even if the gap 15 is formed, the gap width is suppressed. For this reason, it is possible to suppress the molten metal from being inserted between the main refractory layer 11 and the auxiliary refractory layer 13 and to extend the life of the molten metal passage nozzle.

  In particular, according to the present embodiment, when the molten metal passage nozzle is used, the main refractory layer 11 and the like are formed so that the gap 15 is generated in the boundary region 15x between the main refractory layer 11 and the auxiliary refractory layer 13. There is a risk of displacement. This is presumed to be the thermal expansion due to heating of the iron skin 4 and the influence of gravity acting on the main refractory layer 11. Even in such a case, with respect to the refractory portion (head 110 and / or loading material 48) covered by at least the cylindrical extending cylindrical portion 430 of the iron shell 4 in the refractory layer 1, In the normal temperature region, the pre-compression state has already been established in the axial direction (arrow P direction). For this reason, when heated and heated in use, the axial length direction (arrow P direction) of the main refractory layer 11 in the axial length direction (arrow P direction), particularly the head 110 that has been in a pre-compressed state. The amount of thermal expansion at increases. As a result, the occurrence of the gap 15 described above in the boundary region 15x between the main refractory layer 11 and the sub refractory layer 13 is suppressed. Even if the gap 15 is formed, the gap width is suppressed. As a result, even if the gap 15 is generated in the boundary region 15x between the main refractory layer 11 and the auxiliary refractory layer 13, the gap width can be reduced. For this reason, when the molten metal passage nozzle is used, the molten metal is suppressed from being inserted into the boundary region 15x between the main refractory layer 11 and the auxiliary refractory layer 13. Therefore, the deterioration resulting from the molten metal insertion in the boundary region 15x is suppressed. Therefore, the lifetime of the molten metal passage nozzle can be extended.

  The heating element 8 described above may be a member that induction heats the iron skin 4. In this case, when a high-frequency current is supplied to the heating element 8, the iron skin 4 is induction-heated by electromagnetic induction. The heating element 8 makes one or more turns around the axis P <b> 1 and heats the extended cylindrical portion 430 of the first iron skin 41. The high frequency current can be set as appropriate within a range of 1 kc to 200 kc, for example. Therefore, the iron skin 4 requires conductivity and magnetic permeability. The iron skin 4 may be an iron material. The heating atmosphere may be an air atmosphere or may be heated while blowing an inert gas such as argon gas or nitrogen gas. If induction heating is used, magnetic flux can be intensively transmitted through the iron skin 4 formed of an iron-based material having a higher magnetic permeability than the refractory portion, so that the thermal expansion of the refractory portion is suppressed. The iron skin 4 can be heated intensively, and it can contribute to the increase in thermal expansion of the extending cylinder part 40 of the iron skin 4.

  According to the present embodiment, as shown in FIG. 5, the expanding inclined surface 112 of the head 110, the expanding inclined portion 420 of the second iron skin 42, and the engaging surface 43 m of the ring body 43 are each in the same direction. It is inclined like a conical ring. For this reason, if the pressurizing body 93 pressurizes the ring body 43 in the direction of the arrow U, an urging force F directed in the radial direction while being directed downward can be obtained by the principle of the wedge. Therefore, it is possible to contribute to bringing the surface 100s of the head 110 into close contact with the surface 13s of the auxiliary refractory layer 13 while normalizing the posture and radial position of the head 110 of the main refractory layer 11. . Therefore, it is possible to further contribute to reducing the gap 15 in the boundary region 15x between the head portion 110 of the main refractory layer 11 and the auxiliary refractory layer 13.

  Furthermore, when a compressive force is applied to the head portion 110 in the axial direction, an urging force F is generated in an oblique direction with respect to the axis P1 in the radially inward direction, so that the inner periphery 100i of the thick-walled cylindrical head portion 110i. A compressive force can be applied to the side, which can contribute to the compression of the entire head 111 in the axial length direction. Furthermore, the sealing performance on the inner circumference 100i side of the head 110 on the side into which the molten metal is inserted can be improved, and the entry of the molten metal from the inner circumference 100i of the head 110 is suppressed.

(Embodiment 2)
FIG. 6 shows the concept of the second embodiment. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. In the following, different parts will be mainly described. As shown in FIG. 6, the cylindrical first iron skin 41 in which the auxiliary refractory layer 13 is embedded is installed on the installation surface 90 of the base 9 while being inverted upside down. In this case, the auxiliary refractory layer 13 is placed on the installation surface 90 of the base 9. Then, as shown in FIG. 6, the main refractory layer 11 having a cylindrical shape is inserted downward (in the direction of arrow U) from the opening 41w of the first iron skin 41, and the outer peripheral wall surface of the main refractory layer 11 and the first 1 A loading material 48 (seal material) is interposed between the iron skin 4 and the iron skin 4. Further, the ring body 43 is placed on the loading material 48 and the spread inclined surface 112 of the second iron skin 4 from above. The ring body 43 has a ring shape that makes one round around the axis P1.

  Thereafter, in the normal temperature region, the lower surface of the C-shaped or rod-shaped pressurizing body 93B is strongly pressed by the ring body 43, so that the head 110, the loading material 48, and the extended cylindrical portion 430 are axially extended (arrow P direction). Pressurize and compress. Thus, in the normal temperature region, the first iron skin 4, the second iron skin 4, and the ring body 43 are integrally coupled by the welded portion 49 (see FIG. 1) in a state of being compressed and compressed. In this case, the refractory portion (head 110 and / or loading material 48) of the main refractory layer 11 that is close to the sub refractory layer 13 is pre-compressed in the axial direction (arrow P direction). ing.

  In particular, as shown in FIG. 6, since the expansion inclined surface 112 and the engaging surface 43 m are inclined, if the pressure body 93 </ b> B strongly presses the ring body 43 downward (in the direction of the arrow U), the principle of the wedge is used. An urging force F directed in the radial direction while being directed downward is obtained. For this reason, it becomes advantageous to press-compress the whole head 110 (the whole including the radial direction) surrounded by the first iron shell 41 in the main refractory layer 11 in the axial length direction (arrow P direction). . Furthermore, the urging force F can improve the sealing performance on the inner circumference 100i side of the head 110 where the molten metal is inserted. Therefore, when using the molten metal passage nozzle device as shown in FIG. 1, it is possible to further contribute to the reduction of the gap 15 in the boundary region 15 x between the main refractory layer 11 and the auxiliary refractory layer 13. The molten metal is suppressed from being inserted into the gap 15. This is because it is possible to expect thermal expansion of the head 110 and / or the loading material 48 so that the gap 15 disappears during use.

(Others) The present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications within a range not departing from the gist. Although the ring body, the first iron skin, and the second iron skin are joined by the welded portion, the present invention is not limited to this, and may be joined by a bolt or a nut. You may combine with a rivet. The expanding inclined surface 112 and the engaging surface 43m may be along a direction perpendicular to the axis P1. The main refractory layer 11 and the sub refractory layer 13 are manufactured separately from each other and then assembled. The refractory portion corresponding to the main refractory layer 11 and the refractory portion corresponding to the sub refractory layer 13 are assembled. And may be integrally formed. The following technical idea can also be grasped from the description of this specification.
A refractory layer that is formed of a refractory material extending along the axial length direction and has a tubular refractory layer having a molten metal passage hole along the axial length direction, and an iron skin that covers the upper end of the refractory material layer. In the molten metal passage nozzle, the molten metal passage nozzle, wherein at least a portion of the refractory layer covered with the iron shell in the refractory layer is compressed in the axial length direction in a normal temperature region.

  1 is a refractory layer, 10 is a molten metal vent hole, 11 is a main refractory layer, 13 is a secondary refractory layer, 110 is a head, 112 is an expanded inclined surface, 15 is a gap, 15x is a boundary region, 4 is iron Leather, 41 is the first iron skin, 42 is the second iron skin, 43 is the ring body, 430 is the extension cylinder, 48 is the loading material, 8 is the heating element, 9 is the base, 90 is the installation surface, 93 is Each of the pressure bodies is shown.

Claims (5)

A refractory layer that is formed of a refractory extending along the axial length direction and has a tubular shape having a molten metal passage hole along the axial length direction, and an iron skin that covers an upper end portion of the refractory layer. In the molten metal passage nozzle,
Of the refractory layer, at least a portion of the refractory covered by the iron skin is compressed in the axial length direction in a normal temperature region so that the amount of thermal expansion in the axial length direction can be increased as the temperature rises during use. A molten metal passage nozzle characterized by being in a state. The iron skin according to claim 1, wherein the iron skin includes a first iron skin, a second iron skin disposed below the first iron skin, and the first iron skin and the second iron skin in the axial length direction. A ring body provided between the first iron skin and the second iron skin,
The first iron skin is in a compressed state in the axial length direction in a normal temperature region, and at least a portion of the refractory layer covered with the first iron skin of the refractory layer is heated with an increase in temperature. A molten metal passage nozzle characterized by being compressed in the axial length direction in a normal temperature region so as to increase the amount of thermal expansion in the long direction.   3. The refractory layer according to claim 1, wherein the refractory layer includes a main refractory layer extending in an axial length direction and a sub refractory layer provided on the upper side of the main refractory layer, A molten metal passage nozzle that covers an upper end portion of a main refractory layer and the auxiliary refractory layer. A material having a cylindrical refractory layer formed of a refractory extending along the axial length direction and having a molten metal passage hole along the axial length direction and an iron skin covering the upper end of the refractory layer. A process to prepare;
A heating step of thermally expanding the iron skin in the axial length direction by heating at least a part of the iron skin;
Of the refractory layer, the refractory covered with the heat-shrinked and cooled iron skin portion of the refractory layer by cooling the iron shell heated in the heating step and causing heat shrinkage in the axial length direction. A method for producing a molten metal passing nozzle, comprising: a cooling step in which the portion is compressed in the axial length direction in a normal temperature region so that the amount of thermal expansion in the axial length direction can be increased as the temperature rises. 5. The iron skin according to claim 4, wherein the iron skin includes a first iron skin covering the refractory part, a second iron skin disposed below the first iron skin and covering the refractory part, and the first iron skin in the axial direction. A ring body provided between the iron skin and the second iron skin and connecting the first iron skin and the second iron skin;
The heating step is a step in which the first iron skin is heated and thermally expanded in the axial length direction while being assembled in a state where the first iron skin and the second iron skin are combined through the ring body. Yes,
In the cooling step, the first iron shell heated in the heating step is cooled and thermally contracted in the axial length direction, thereby cooling the first refractory layer after being heated and thermally contracted. The refractory part covered by the iron skin part of the iron skin is a process of making it compressed in the axial length direction so that the amount of thermal expansion in the axial length direction can be increased as the temperature rises during use. A method for producing a molten metal passage nozzle.

Images