WO2020158393A1 - ストッパー等の製造方法 - Google Patents

ストッパー等の製造方法 Download PDF

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Publication number
WO2020158393A1
WO2020158393A1 PCT/JP2020/001079 JP2020001079W WO2020158393A1 WO 2020158393 A1 WO2020158393 A1 WO 2020158393A1 JP 2020001079 W JP2020001079 W JP 2020001079W WO 2020158393 A1 WO2020158393 A1 WO 2020158393A1
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WO
WIPO (PCT)
Prior art keywords
stopper
core
manufacturing
molded body
heat treatment
Prior art date
Application number
PCT/JP2020/001079
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
福永　新一
和久 香月
敏雄 加来
大樹 古川
Original Assignee
黒崎播磨株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 黒崎播磨株式会社 filed Critical 黒崎播磨株式会社
Publication of WO2020158393A1 publication Critical patent/WO2020158393A1/ja

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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
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B22D41/18—Stopper-rods therefor

Definitions

  • the present invention relates to a continuous casting nozzle such as a stopper or a dipping nozzle or an upper nozzle that controls a flow rate when the molten steel is discharged from a tundish into a mold in continuous casting of molten steel.
  • a continuous casting nozzle such as a stopper or a dipping nozzle or an upper nozzle that controls a flow rate when the molten steel is discharged from a tundish into a mold in continuous casting of molten steel.
  • stopper or nozzle for continuous casting is simply referred to as "stopper or the like”.
  • stoppers and the like have a gas blowing function for the purpose of floating inclusions in molten steel or preventing adhesion of inclusions to the inner wall of the nozzle or the like.
  • a porous graphite-containing carbon-bonded refractory having an air permeability of 500 to 5000 (cm 3 ) (cm)/(min) (cm 2 ) (kg/cm 2 ) at the tip of the stopper is disclosed.
  • a stopper for a gas blown tundish is disclosed.
  • Patent Document 2 a plurality of through pores having a diameter of 0.1 to 0.5 mm are radially arranged from the inner hole surface to the outer surface in the horizontal direction with respect to the axis of the tundish stopper.
  • a featured tundish stopper is disclosed.
  • Patent Document 3 also states that "when the raw material is put into the mold, the fixed combustible material is displaced, or if the combustible material is a thin fibrous material, it is bent and entangled to form a fixed position as a through hole. It is technically difficult to set the above-mentioned ".”, it is difficult to form a small-diameter through hole as shown in Patent Document 2 as designed and stably, If it is not formed as designed and stably, it may be difficult to stably obtain the intended gas bubble diameter and gas discharge amount, and the adhesion prevention function and the cleaning function may become insufficient.
  • Patent Document 3 in a rubber press device, a warp yarn made of a combustible yarn blanket (braided) woven fabric forms a through hole, and a weft yarn has a through hole in the axial direction.
  • the cylindrical through-hole forming bodies arranged in the circumferential direction are fixed to the tip of the core metal for molding, and then the mold is filled with a refractory kneaded clay, and then the mold is burned to make the combustible yarn.
  • a method for producing a gas-blowing-type stopper head is disclosed in which a cylindrical through-hole forming body of a blank (braided) woven fabric is burned down to form a fine through-hole for gas blowing.
  • Patent Document 3 Even by the method of Patent Document 3, it is difficult to completely prevent the deformation and displacement of the “warp made of the combustible yarn blanket (braided) fabric” at the time of molding. It is still difficult to manufacture through holes with high precision.
  • the problem to be solved by the present invention is to provide a method for manufacturing a gas discharge through hole with high accuracy.
  • the present invention is a method for manufacturing a stopper or the like described in 1 to 8 below.
  • a method for manufacturing a stopper or the like having a gas discharge through hole A step of manufacturing a core by installing a substance that disappears by heat treatment on a side surface of a columnar refractory body (hereinafter referred to as "primary body"), The core is placed in a molding frame for molding the stopper and the like, and secondary molding is performed by filling a kneaded clay for molding the stopper and the like around the core, or is separately manufactured around the core.
  • primary body a columnar refractory body
  • the secondary forming method is a method of pressurizing a kneaded material which is an aggregate of powder, Alternatively, the method for producing the stopper or the like according to 1 above, which is a method of pouring, spraying or thrusting muddy clay. 3.
  • the substance that disappears by the heat treatment is installed by projecting to the outside of the side surface of the primary molded body, or installed in a groove formed on the side surface of the primary molded body. 2.
  • the gas discharge through-holes are a plurality of pores, and in the step of manufacturing the core, a substance that disappears by the heat treatment is a plurality of filaments, and the filaments are circumferentially disposed on a side surface of the primary molded body. 4.
  • the method of disposing the filamentous material dispersedly at a plurality of circumferential positions on the side surface of the primary molded body is a method of adding an article in the form of a thread in advance, or a liquid material is applied in a filamentous shape and solidified.
  • the method for producing a stopper or the like as described in 4 above which is a method. 6.
  • the gas discharge through hole has a slit shape, and in the step of manufacturing the core, the substance that disappears by the heat treatment is a film-like material, and the film-like material is provided at a plurality of circumferential positions on the side surface of the primary molded body.
  • the method for producing a stopper or the like according to 1 above which is installed in a dispersed manner or installed on substantially the entire side surface of the primary molded body. 7.
  • FIG. 3 is an image view of one embodiment (a stopper and a nozzle for continuous casting) manufactured by the manufacturing method of the present invention as viewed in a vertical cross section.
  • FIG. 2 is an image view (plan view) of the nozzle shown in FIG. 1 viewed from above.
  • a thread as a substance that disappears by heat treatment is installed on the side surface of the primary molded body to form a plurality of pores, an image of the arrangement of the primary molded body and the thread (stopper in the distal direction). From the top view).
  • the primary molded body and the groove when a plurality of pores are formed by installing a liquid substance as a substance that disappears by heat treatment in the groove formed on the side surface of the primary molded body Image of arrangement of (liquid substance) (plan view of stopper viewed from tip direction). In the same way as in Fig.
  • the stopper 10 is an integral molded product of a columnar (conical-conical) primary molded body 11 (a portion that becomes a core when the stopper 10 is manufactured) and a secondary molded body 12.
  • a plurality of fine holes 13 are provided as gas through holes at predetermined intervals in the direction.
  • One end (base end) of each pore 13 communicates with an inner hole 12a that is a gas introduction path inside the stopper 10 (secondary molded body 12), and the gas introduced through this inner hole 12a is It is discharged from the other end (tip) of the fine hole 13.
  • the nozzle 20 is also an integral molded product of a columnar primary molded body 21 (a portion that becomes a core when the nozzle 20 is manufactured) and a secondary molded body 22, and has a predetermined interval in the circumferential direction on the side surface of the primary molded body 21.
  • a plurality of fine holes 23 are provided as through holes for discharging gas.
  • One end (base end) of each pore 23 communicates with a gas pool 22a that is a gas introduction path inside the nozzle 20 (secondary molded body 22), and the gas introduced through this gas pool 22a is It is discharged from the other end (tip) of the fine hole 23.
  • the nozzle 20 has a nozzle hole 24 that can be fitted into the stopper 10, as shown in FIG.
  • the stopper or the like of the present embodiment is an integrally molded product of the primary molded product and the secondary molded product, and both the primary molded product and the secondary molded product are made of refractory material.
  • the composition can be adjusted according to individual operating conditions from the viewpoints of adhesion of inclusions during continuous casting, corrosion resistance, wear resistance and the like.
  • pressure molding such as CIP which is exposed to high pressure.
  • the molding method is a so-called amorphous refractory, in which the kneaded material, which is an aggregate of powder, is pressed, and the mud-shaped kneaded material is poured, blown, or pierced and then cured.
  • the molding method or the like can be arbitrarily selected.
  • a core made by placing a substance that disappears by heat treatment on the side surface of the primary molded body is placed in a molding frame for molding a stopper or the like, and a stopper is provided around the core. It is performed by filling the kneaded material for forming, etc.
  • “filling the kneaded material” means to press the kneaded material which is an aggregate of the powder, to pour in and blow the muddy kneaded material.
  • It is a general term for pushing.
  • composition of substances that disappear by heat treatment there is no limitation on the composition of substances that disappear by heat treatment, as long as they disappear at temperatures below the heat treatment temperature.
  • a thread or the like which is already solid at room temperature can be used.
  • a liquid substance is used by forming a groove 11a on the side surface of the primary molded body 11 and installing it in the groove 11a as shown in FIG.
  • a liquid material having hardness can be used.
  • each pore 13 is provided with the substance 16 that disappears by the heat treatment described above. It communicates with the gas flow path (gas pool for gas homogenization) formed in the part. That is, in FIG. 4, the yarn 14 is installed so that one end (base end) thereof communicates with a gas flow path (gas pool for gas homogenization) formed in a portion where the substance 16 that disappears by heat treatment is installed. ing. In FIG. 4, a core rod is attached to the inner hole 12a during molding.
  • the nozzle 20 (pore 23, gas pool 22a) shown in FIGS. 1 and 3 can also be manufactured by the same method as in FIG.
  • the horizontal cross-sectional shape (outer shape) of the columnar primary molded body there is no particular limitation on the horizontal cross-sectional shape (outer shape) of the columnar primary molded body, and it is possible to arbitrarily select a circle, an ellipse, a polygon, or the like.
  • the circular shape is most preferable, and in the case of the polygonal shape, it is preferable that the edge portion is a curved surface (with R).
  • the gas discharge through-hole has a plurality of pores, but the gas discharge through-hole may be a slit.
  • a substance that disappears by heat treatment is formed into a film-like material 17, and the film-like material 17 is dispersed and installed at a plurality of circumferential positions on the side surface of the primary molded body 11, or the primary molding is performed. It is installed on almost the entire side surface of the body 11.
  • the reason why it is installed in "substantially the whole" is that a joining portion is partially required between the side surface of the primary molded body 11 and the surrounding secondary molded body 12.
  • the size of these through holes for gas discharge can be arbitrarily set according to individual operating conditions, but preferably the pore diameter is 2 mm or less or the slit diameter.
  • the flow rate can be controlled with higher precision, and the proportion of small-diameter bubbles (generally less than 3 mm) that easily floats inclusions in the molten steel and does not easily cause defects in the steel is increased. be able to.
  • the integrally molded product including the core is manufactured by the secondary molding.
  • the core and the part excluding the core are manufactured separately, and both are made of a refractory bonding material such as mortar. It is also possible to make an integral molding including the core by joining the cores through the core.
  • Stopper 11 Primary Formed Body 11a Groove 12 Secondary Formed Body 12a Inner Hole (Gas Inlet Path) 13 Pores (through holes for gas discharge) 14 threads (substances that disappear by heat treatment) 15 Core 16 Substances that disappear by heat treatment (portion that becomes gas distribution channel (gas pool)) 17 Film-like substances (substances that disappear by heat treatment) 20 Nozzle 21 Primary Molded Body 22 Secondary Molded Body 22a Gas Pool 23 Pore (Through Hole for Gas Discharge) 24 nozzle holes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
PCT/JP2020/001079 2019-01-30 2020-01-15 ストッパー等の製造方法 WO2020158393A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019014518A JP7134108B2 (ja) 2019-01-30 2019-01-30 ストッパー等の製造方法
JP2019-014518 2019-01-30

Publications (1)

Publication Number Publication Date
WO2020158393A1 true WO2020158393A1 (ja) 2020-08-06

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Application Number Title Priority Date Filing Date
PCT/JP2020/001079 WO2020158393A1 (ja) 2019-01-30 2020-01-15 ストッパー等の製造方法

Country Status (3)

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JP (1) JP7134108B2 (zh)
TW (1) TW202041301A (zh)
WO (1) WO2020158393A1 (zh)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006068798A (ja) * 2004-09-06 2006-03-16 Kurosaki Harima Corp 内孔体を有する連続鋳造用ノズル
JP2013184199A (ja) * 2012-03-08 2013-09-19 Kurosaki Harima Corp ガス注入機能を備えたノズル
JP2013220469A (ja) * 2012-04-19 2013-10-28 Nippon Steel & Sumitomo Metal Corp 注湯用ノズル

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006068798A (ja) * 2004-09-06 2006-03-16 Kurosaki Harima Corp 内孔体を有する連続鋳造用ノズル
JP2013184199A (ja) * 2012-03-08 2013-09-19 Kurosaki Harima Corp ガス注入機能を備えたノズル
JP2013220469A (ja) * 2012-04-19 2013-10-28 Nippon Steel & Sumitomo Metal Corp 注湯用ノズル

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JP7134108B2 (ja) 2022-09-09
JP2020121324A (ja) 2020-08-13
TW202041301A (zh) 2020-11-16

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