Method and apparatus for continuous casting of metals
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0714161
(2000-11-17)
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우선권정보 |
JP-0207972 (2000-07-10); JP-0207973 (2000-07-10) |
발명자
/ 주소 |
- Yamane, Hiroshi
- Bessho, Nagayasu
- Miki, Yuji
- Takeuchi, Shuji
- Kirihara, Tadasu
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
4 인용 특허 :
5 |
초록
▼
During continuous casting of metals, a non-moving, vibrating magnetic field is applied to a molten metal in a casting mold to impose only vibration on the molten metal. This continuous casting method can produce a cast slab much less susceptible to flux entrainment, capture of bubbles and non-metal
During continuous casting of metals, a non-moving, vibrating magnetic field is applied to a molten metal in a casting mold to impose only vibration on the molten metal. This continuous casting method can produce a cast slab much less susceptible to flux entrainment, capture of bubbles and non-metal inclusions near the surface of the molten metal, and surface segregation. The magnetic field is preferably produced by arranging electromagnets in an opposing relation on both sides of the mold to lie side by side in the direction of longitudinal width of the mold, and supplying a single-phase AC current to each coil. The single-phase AC current preferably has frequency of 0.10 to 60 Hz. A static magnetic field can be applied intermittently in the direction of thickness of a cast slab. This technique can produce a cast slab substantially free from the flux entrainment and the surface segregation. Preferably, the static magnetic field is intermittently applied under setting of an on-time t1=0.10 to 30 seconds and an off-time t0=0.10 to 30 seconds. Also, the static magnetic field is preferably applied to the surface of the molten metal.
대표청구항
▼
During continuous casting of metals, a non-moving, vibrating magnetic field is applied to a molten metal in a casting mold to impose only vibration on the molten metal. This continuous casting method can produce a cast slab much less susceptible to flux entrainment, capture of bubbles and non-metal
During continuous casting of metals, a non-moving, vibrating magnetic field is applied to a molten metal in a casting mold to impose only vibration on the molten metal. This continuous casting method can produce a cast slab much less susceptible to flux entrainment, capture of bubbles and non-metal inclusions near the surface of the molten metal, and surface segregation. The magnetic field is preferably produced by arranging electromagnets in an opposing relation on both sides of the mold to lie side by side in the direction of longitudinal width of the mold, and supplying a single-phase AC current to each coil. The single-phase AC current preferably has frequency of 0.10 to 60 Hz. A static magnetic field can be applied intermittently in the direction of thickness of a cast slab. This technique can produce a cast slab substantially free from the flux entrainment and the surface segregation. Preferably, the static magnetic field is intermittently applied under setting of an on-time t1=0.10 to 30 seconds and an off-time t0=0.10 to 30 seconds. Also, the static magnetic field is preferably applied to the surface of the molten metal. ty of points using a temperature measurement device; estimating a flow pattern of the molten steel in the mold based on a distribution of the copper plate temperatures at individual measurement points; and determining a heat flux being transferred from the molten steel in the mold to a cooling water for the mold copper plate using the mold copper plate temperatures measured by the temperature measurement device, thickness of the mold copper plate, distance between a surface of the mold copper plate on the molten steel side and a tip of a temperature measurement element, temperature of the cooling water for the mold copper plate, thickness of a solidified shell, thickness of a mold powder layer, and temperature of the molten steel in the mold; deriving a convection heat transfer coefficient, corresponding to the heat flux, between the molten steel and a solidified shell; and determining flow speed of the molten steel along the solidified shell based on the thus derived convection heat transfer coefficient. 4. A method for estimating flow pattern of molten steel in continuous casting, comprising the steps of: continuously casting a molten steel injected into a mold through an immersion nozzle; measuring temperatures of a copper plate in width direction of the copper plate on longer side of the mold at a plurality of points using a temperature measurement device; and estimating a flow pattern of the molten steel in the mold based on a distribution of the copper plate temperatures at individual measurement points; the temperature measurement device for the mold copper plate comprising a plurality of temperature measurement elements which are buried in rear face of the mold copper plate for continuous casting, the temperature measurement elements being located in a distance range of from 10 to 135 mm from the level of molten steel in the mold to the direction of slab-drawing, a distance between a surface of the mold copper plate on the molten steel side and a tip of the temperature measurement element being 16 mm or less, while keeping not more than 200 mm of intervals of the temperature measurement elements in the mold width direction and allotting thereof over a range corresponding to a whole width of the slab. 5. A method for estimating flow pattern of molten steel in continuous casting comprising the steps of: continuously casting a molten steel injected into a mold through an immersion nozzle; measuring temperatures of a copper plate in width direction of the copper plate on longer side of the mold at a plurality of points using a temperature measurement device; and estimating a flow pattern of the molten steel in the mold based on a distribution of the copper plate temperatures at individual measurement points; the step of estimating the flow pattern comprising estimating a deflected flow of the molten steel in the mold based on the measured temperatures by comparing a maximum value and a position of the maximum value of the temperatures of mold copper plate at right half width with a maximum value and a position of the maximum value of the temperatures of mold copper plate at left half width of the mold to a center of the mold width. 6. A temperature measurement device for mold copper plate comprising: a plurality of temperature measurement elements buried in a rear face of a mold copper plate for continuous casting process; the temperature measurement elements being located in a distance range of from 10 to 135 mm from a level of molten steel in the mold to a direction of slab-drawing, a distance between a surface of the mold copper plate on a molten steel side and a tip of the temperature measurement element being 16 mm or less, while keeping not more than 200 mm of intervals of the temperature measurement elements in a mold width direction, and allotting thereof over a range corresponding to a whole width of the slab. 7. The temperature measurement device of claim 6, wherein the temperature mea
이 특허에 인용된 특허 (5)
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Kunstreich Siebo,FRX ; Nove Marie Claude,FRX, Apparatus for electromagnetically braking a molten metal in a continuous casting mold.
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Fujisaki Keisuke,JPX ; Wajima Kiyoshi,JPX ; Umetsu Kenji,JPX ; Sawada Kenzo,JPX ; Ueyama Takatsugu,JPX ; Toh Takehiko,JPX ; Okazawa Kensuke,JPX ; Okumura Yasushi,JPX, Continuous casting method and apparatus.
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Lari Robert J. (Aurora IL) Praeg Walter F. (Palos Park IL) Turner Larry R. (Naperville IL), Electromagnetic confinement and movement of thin sheets of molten metal.
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Nathenson Richard D., Electromagnetic flow control valve for a liquid metal.
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Nathenson Richard D., Electromagnetic flow control valve for a liquid metal with built-in flow measurement.
이 특허를 인용한 특허 (4)
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Pavlov, Evgeny; Ivanov, Dmitry; Gasanov, Pavel; Gulayev, Andrew, Method and apparatus for moving molten metal.
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Hur, Bo Young; Cho, Soon Hyung; Kim, Ki Bae; Bae, Seok Choun, Method and apparatus for the continuous production of foamed metals.
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Hur,Bo Young; Cho,Soon Hyung; Kim,Ki Bae; Bae,Seok Choun, Method and apparatus for the continuous production of foamed metals.
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Miki,Yuji; Takeuchi, legal representative,Yuko; Yamauchi,Akira; Takeuchi,Shuji, Method of continuous steel casting.
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