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1. 发明专利

JPH05212502A METHOD AND DEVICE FOR TWIN ROLL TYPE STRIP CONTINUOUS CASTING 失效
公开(公告)号：JPH05212502A
公开(公告)日：1993-08-24
申请号：JP1909192
申请日：1992-02-04
申请人： NIPPON STEEL CORP
发明人： MIYAZAWA KENICHI , MIZOGUCHI TOSHIAKI , UEJIMA YOSHIYUKI , HORI RYUICHI
IPC分类号： B22D11/06
摘要： PURPOSE:To secure the adhesion of a side weir and cooling rolls and prevent casting defect by using limiting plates having shrinkable both of side edges in a twin roll type continuous casting having the limiting plates whose tip parts come into contact with the outer peripheral surfaces of a pair of the cooling rolls and both sides come into contact with the side weirs. CONSTITUTION:At the time of forming a molten metal pouring basin part by pouring the molten metal into a continuously cast mold constituted by pressing the side weirs 3, 3 to both end surfaces 1A, 1A of one pair of the cooling rolls 1, 1 mutually arranged in horizontal and parallel directions, by using the limiting plates 4, 4 whose tip parts are brought into contact with the outer peripheral surfaces 1B, 1B of the cooling roll and both of side edges 6, 6 are brought into contact with the side weirs 3, 3 and the surface of the molten metal basin part and the outer peripheral surfaces 1B, 1B of the cooling rolls are separated. Then, the molten metal pouring basin part is constituted so as to use the limiting plates 4, 4 having shrinkable both side edges. Therefore, the casting can be executed without generating enclosing of the scum and the surface roughness of the cast strip caused by the waving of the molten metal.

2. 发明专利

JPH0751837A DEVICE FOR CONTROLLING POURING FLOW RATE OF MOLTEN METAL 失效
公开(公告)号：JPH0751837A
公开(公告)日：1995-02-28
申请号：JP19839593
申请日：1993-08-10
申请人： NIPPON STEEL CORP
发明人： TERADA TAKASHI , OMURA YASUMASA , KIMURA SEIICHI , HORI RYUICHI
IPC分类号： B22D11/10 , B22D41/18
摘要： PURPOSE:To restrain the stagnation of molten metal flow by straightening and to make the casting in a long time possible by making a radius of curvature in a contracting hole in a plugging structure and a radius of curvature in a diameter expanding part at the lower end of the contracting hole larger than the specific times the contracting hole diameter. CONSTITUTION:The molten metal S in a vessel 1 is poured after passing through the contracting hole 6 arranged in the plugging structure 5 at the lower end of the stopper 4 and a pipe 3. An opening area of the contracting hole 6 at the side surface of the plugging structure 5 is adjusted by reciprocating the stopper 4 in the vertical direction to control the pouring flow rate of the molten metal S. The contracting hole 6 is gradually curved according as the radius 8 of curvature having the size of >=2 times of this diameter and the flow of the molten metal S at this position is straightened and the stagnation is eliminated. Further, the cross sectional area at the outlet part of the contracting hole 6 is gradually enlarged according as the radius 9 having the size of >=2 times of the contracting hole diameter 7, and as the contracting hole has the structure connected with the hole 2 in the vertical direction of the pipe 3, the flow near the outlet of the contracting hole 6 is straightened and the stagnation is eliminated.

3. 发明专利

JPH06106310A NOZZLE FOR CASTING 失效
公开(公告)号：JPH06106310A
公开(公告)日：1994-04-19
申请号：JP26160292
申请日：1992-09-30
申请人： NIPPON STEEL CORP , KUROSAKI REFRACTORIES CO
发明人： HORI RYUICHI , MIHARA HIRONOBU , MIZUTA HIROAKI , MIWA MASUYUKI
IPC分类号： B22D11/10 , B22D11/16 , B22D41/50 , B22D41/58
摘要： PURPOSE:To reduce the developing rate of pin holes in a cast slab by providing at least one or mare of pressure measuring holes penetrating plural fine holes from the inner wall to the outer wall of a nozzle for casting in the measuring holes. CONSTITUTION:In packing material providing a base material 11 in an immersion nozzle and SUS-made socket metal tool 12 for connecting guiding pressure piping, the pressure measuring hole is arranged. As this material, coating material or heat resistant-mortar is used. A metal hoop 14 fixes the socket metal tool 12. Plural pieces of organic fibers 15 are arranged from the inner wall to the outer wall of the nozzle and eliminated at the time of preheating the immersion nozzle to become the fine pressure measuring holes. The material of a hot sealing material 16 is constituted of Al2O3, SiO2 and water glass. Therefore, by constituting the measuring hole with plural fine holes, the inner pressure in the nozzle can be measured in good precision and the always stable condition, and gas quantity mixed in the mold can be made to be the suitable quantity.

4. 发明专利

JPH04300050A BIROLL TYPE SHEET CASTING METHOD 失效
公开(公告)号：JPH04300050A
公开(公告)日：1992-10-23
申请号：JP6469591
申请日：1991-03-28
申请人： NIPPON STEEL CORP
发明人： HORI RYUICHI , UEJIMA YOSHIYUKI , MIZOGUCHI TOSHIAKI , MIYAZAWA KENICHI , SHIO KIYOMI
IPC分类号： B22D11/06
摘要： PURPOSE:To prevent the nozzle from being closed due to generation an oxide and a nitride caused by a reaction of O and N in the nozzle and a molten metal in the pouring nozzle, in biroll type sheet casting. CONSTITUTION:In the method for casting directly a sheet by pouring a molten metal to a biroll type casting machine through a pouring nozzle in which the inner nozzle is inserted into the outer nozzle 22, an atmosphere in the pouring nozzle is replaced with inert gas in advance, and when pouring of the molten metal is started to a biroll subsequently to the replacement, it is prevented that the nozzle is closed, and the quality and state of the sheet are not deteriorated.

5. 发明专利

JPH0699257A INTERNAL GAS PRESSURE CONTROL METHOD FOR NOZZLE FOR CASTING 失效
公开(公告)号：JPH0699257A
公开(公告)日：1994-04-12
申请号：JP25003792
申请日：1992-09-18
申请人： NIPPON STEEL CORP
发明人： HORI RYUICHI , MIHARA HIRONOBU , MIZUTA HIROAKI , OMURA YASUMASA
IPC分类号： B22D11/10 , B22D11/16 , G01L7/00
摘要： PURPOSE:To reduce a pin hole generating rate of cast slab by using the internal gas pressure control method of a nozzle for casting as to continuous casting of steel. CONSTITUTION:When a variation quantity from the steady state value of the nozzle internal pressure inside an immersion nozzle 4 of a tundish for continuous casting exceeds the base value, by reducing an upper nozzle 1 Ar flow quantity, an apparent specific gravity of molten metal is raised, it makes the nozzle internal pressure return to the steady state value, or by increasing an upper nozzle Ar flow quantity, an apparent specific gravity of molten metal is reduced, thus, it executes the control to make the nozzle internal pressure return to the steady state value.

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