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1. 发明专利

JPH03198951A METHOD AND APPARATUS FOR CONTINUOUSLY CASTING CAST STRIP 失效
公开(公告)号：JPH03198951A
公开(公告)日：1991-08-30
申请号：JP33651989
申请日：1989-12-27
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： FURUYA TAKASHI , TAKEUCHI HIDEMARO , MATSUMURA SHOGO , KASAMA AKIO , SASAKI KUNIMASA , YAMAMOTO KEIICHI
IPC分类号： B22D11/06
摘要： PURPOSE:To prevent the development of surface defect by blowing inert gas on surface of drums just before the surfaces of cooling drums shift to outer air shut-off area in pouring basin part at the time of producing a cast strip by forming the pouring basin part shut off from the outside air between one pair of the cooling drums. CONSTITUTION:Just before the cooling drums 3a, 3b shift to the outside air shut-off area 10 in the pouring basin part 4, the inert gas is blown against the above cooling drums 3a, 3b. The thin air layer on surface of the cooling drums 3a, 3b is shut off with the gas and further, air in dimples can be removed and atmosphere in a seal chamber 6 can be perfectly made to inert gas atmosphere. By this method, as the atmosphere in the pouring basin part can be made to more perfect non-oxidizing atmosphere, the oxidation on the molten metal surface is reduced and surface defect caused by involution of scum can be prevented and the cast strip having excellent quality can be produced.

2. 发明专利

JPH02307652A METHOD FOR CONTROLLING CROWN IN THIN CONTINUOUS CASTING 失效
公开(公告)号：JPH02307652A
公开(公告)日：1990-12-20
申请号：JP12734789
申请日：1989-05-20
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： FURUYA TAKASHI , TAKEUCHI HIDEMARO , MATSUMURA SHOGO , KASAMA AKIO , SASAKI KUNIMASA , YAMAMOTO KEIICHI
IPC分类号： B22D11/06
摘要： PURPOSE:To produce a thin cast billet having the objective projecting crown at good accuracy by measuring the profile of the thin cast billet sent out from drum gap and adjusting the flow rate of cooling water based on the measuring result. CONSTITUTION:The molten metal 4 poured in pouring basin part 3 is rapidly cooled and solidified on circumferential surfaces of the cooling drum 1a, 1b to make this the solidified shells and welded and integrated with the drum gap 5 and sent out as the thin cast billet 6. The thickness of the thin cast billet 6 is measured in the lateral direction to detect the profile of the thin cast billet 6. This detection result is inputted to a computing element 10, and by comparing with the reference information and operating, the flow rate of the cooling water corresponding to the crown rate of the thin cast billet 6 during production is calculated. By this calculated value, a flow rate adjusting value 13 disposed on the way of a water supplying pipe 12 for supplying the cooling water 11 is adjusted. The cooling water 11 having the flow rate adjusted in such a manner is guided into the cooling drums 1a, 1b to control the crown of the thin cast billet 6.

3. 发明专利

JPH03204147A COOLING DRUM FOR STRIP CONTINUOUS CASTING APPARATUS 失效
公开(公告)号：JPH03204147A
公开(公告)日：1991-09-05
申请号：JP33871089
申请日：1989-12-28
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： MATSUMURA SHOGO , KASAMA AKIO , NAKAYAMA MITSURU , YAMAMOTO KEIICHI , YAMANE TAKASHI
IPC分类号： B22D11/06
摘要： PURPOSE:To prevent the development of crack in a continuously cast strip by forming plural fine recessed parts on peripheral surface of drums with the specific periodic variation in longitudinal and transverse directions at the time of producing the strip metal by continuously casting molten metal with twin drum type. CONSTITUTION:The molten steel 4 in a tundish 5 is poured into a pouring basin 3 formed with two cooling rolls 1a, 1b through a pouring nozzle 2 and drawn as the continuously cast strip 7 with pinch rolls 8 by rotating the rolls 1a, 1b. In this case, plural recessed parts nondirectionally arranged in longitudinal, transverse and slant directions having round or oval shaped opening part of 5 - 100 mum depth and 0.1 - 1.2 mm diameter on the peripheral surface of cooling drums 1a, 1b are provided. The distribution rate of the recesses is varied periodically related to longitudinal direction and transverse direction of drum alone or both simultaneously, and the cycle W of the periodic variation of the recesses is set to 5 mm

4. 发明专利

JPH0377747A METHOD FOR CONTINUOUSLY CASTING CAST STRIP 失效
公开(公告)号：JPH0377747A
公开(公告)日：1991-04-03
申请号：JP21065389
申请日：1989-08-17
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： FURUYA TAKASHI , FUJII SUKENARI , TAKEUCHI HIDEMARO , MATSUMURA SHOGO , SASAKI KUNIMASA , YAMAMOTO KEIICHI
IPC分类号： B22D11/06
摘要： PURPOSE:To obtain a cast strip having excellent surface characteristic and quality by supplying mixed gas of absorbable gas and non-absorbable gas to the molten metal onto pouring basin part formed between one pair of rotating cooling drums and casting the cast strip. CONSTITUTION:The molten metal 8 is stored into the pouring basin part 7 from a tundish 1 through a pouring nozzle 2, and rapidly cooled and solidified with the rotating cooling drums 3, 4 to form the cast strip 8-1. By supplying the gas mixing Ar gas at suitable range of mixed ratio according with the cast strip thickness to N2 gas into a seal chamber 5 through a gas supplying pipe 5-1, the cast strip having uniform crystallized grains without any surface crack can be obtd.

5. 发明专利

JPH0366453A TWIN ROLL TYPE CONTINUOUS CASTING MACHINE 失效
公开(公告)号：JPH0366453A
公开(公告)日：1991-03-22
申请号：JP20022489
申请日：1989-08-03
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： FURUYA TAKASHI , TAKEUCHI HIDEMARO , NAKAJIMA HIROYUKI , MATSUMURA SHOGO , SASAKI KUNIMASA , YAMAMOTO KEIICHI
IPC分类号： B22D11/06
摘要： PURPOSE:To develop solidified shell having uniform thickness by separating molten metal surface part near rolls from the other molten metal surface and supplying gas being dissolvable to the molten metal or gas having thermal conductivity larger than that of air. CONSTITUTION:Sealing chamber 13 separating the whole range of surface 12 of molten metal 9 from the outer part, is arranged to demarcate the space 16. Further, in the inner part, a sealing covers 19, 20 demarcating space 18 by parting the molten metal surface part 12a near the rolls 2, 3 from the other surface part 12b, are arranged. A first gas of inert gas, such as Ar gas is sup plied into the space 16 through a pipe 17, and a second gas is supplied into the space 12a through pipes 23, 24. As the second gas, N2 gas, etc., being dissolv able to the molten metal or H2, Ne, He gas, etc., having thermal conductivity larger than that of the air, is introduced. Even if the gas is involved, as the uniform cooling is attained, the uniform thickness can be developed.

6. 发明专利

JPH0255643A METHOD AND NOZZLE FOR CONTINUOUSLY CASTING METAL STRIP 失效
公开(公告)号：JPH0255643A
公开(公告)日：1990-02-26
申请号：JP20313388
申请日：1988-08-17
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： FURUYA TAKASHI , TAKEUCHI HIDEMARO , MATSUMURA SHOGO , SASAKI KUNIMASA , YAMAMOTO KEIICHI
IPC分类号： B22D11/06 , B22D11/119
摘要： PURPOSE:To develop solidified shell having uniform thickness and to obtain a metal strip without having component segregation, surface flaw of lap, etc., and crack by pouring molten metal into pouring basin part formed with cooling drums and side weirs so as to come to uniform upward flow to width direction. CONSTITUTION:The molten metal discharged from discharging holes 14 in a nozzle 10 submerged into the pouring basin part 3 is collided to weirs 15a, 15b continuously arranged to axial direction of the cooling drums 1a, 1b and stirred and mixed between the side walls 11a, 11b and the weirs 15a, 15b to come to the uniform upward flow to the width direction. The molten metal is flowed along the molten metal surface and the cooling drums 1a, 1b in the pouring basin part 3 as showing with the arrow mark 5 and solidified. By this method, as the molten metal surface is not solidified because of coming to uniform molten metal temp. in the pouring basin part 3, the development of the surface flaw caused by enclosing the solidified material can be prevented. Further, as the solidified shell is uniformly developed to the width direction and the solidified shell having uniform thickness is press-welded and rolled between the cooling drums 1a, 1b, the metal strip 4 having excellent surface characteristic without component segregation and crack.

7. 发明专利

JPH0366454A METHOD FOR CONTINUOUSLY CASTING CAST STRIP 失效
公开(公告)号：JPH0366454A
公开(公告)日：1991-03-22
申请号：JP20022589
申请日：1989-08-03
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： FURUYA TAKASHI , TAKEUCHI HIDEMARO , KASAMA AKIO , MATSUMURA SHOGO , HAYASHI KANJI , YAMAMOTO KEIICHI
IPC分类号： B22D11/06
摘要： PURPOSE:To improve wettability in addition to slow cooling effect between molten metal and cooling drum by cleaning the drum surface with cleaning brush arranged to the cooling drum and applying drum coating agent with coating brush to form thin film. CONSTITUTION:The surfaces of cooling drums 3, 4 are cleaned with the cleaning brushes 9, 10 and successively, the thin film having

8. 发明专利

JPS645648A POURING NOZZLE FOR METAL STRIP CONTINUOUS CASTING APPARATUS 失效
公开(公告)号：JPS645648A
公开(公告)日：1989-01-10
申请号：JP16456887
申请日：1987-06-30
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： TANAKA SHIGENORI , MATSUMURA SHOGO , YAMANE ATSUMU , ITANI HIKOTARO
IPC分类号： B22D11/06
摘要： PURPOSE:To stabilize casting operation and to improve quality of a product by forming bottom face of a nozzle to slender rectangular shape and also arranging opening part in the side wall at short side of the nozzle body toward side weir in pouring basin. CONSTITUTION:The nozzle 8 is formed by double construction having an inner nozzle 9 and outer nozzle 10 and the shape of this bottom face is made to the slender rectangular shape corresponding to the molten metal surface in the pouring basin part. Next, the hole part 13 is formed at side face of the outer nozzle 10 facing the side weir 2a, 2b of the pouring basin part. The molten metal flowed down from the opening part 11 of the inner nozzle 9 penetrates porous refractory 12 in a large quantity of them and is poured into the pouring basin part 3. A part of the molten metal is poured into inner face of the side weirs 2a, 2b through the hole part 13. The molten metal under this over-heat condition prevents the development of solidified film at the side weir 2a, 2b and also restrains forming of casting fan. By this method, crack of the product and variation of the thickness are prevented and the casting operation is stabilized and the quality of the product is improved.

9. 发明专利

JPH0366452A TWIN ROLL TYPE CONTINUOUS CASTING MACHINE 失效
公开(公告)号：JPH0366452A
公开(公告)日：1991-03-22
申请号：JP20022389
申请日：1989-08-03
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： FURUYA TAKASHI , TAKEUCHI HIDEMARO , KASAMA AKIO , MATSUMURA SHOGO , YAMAMOTO KEIICHI , YAMANE TAKASHI
IPC分类号： B22D11/06
摘要： PURPOSE:To prevent involution of scum into solidified shell by separately submerging refractory parting plates extended to longitudinal direction of casting rolls into molten metal and arranging exothermic means to the parting plates. CONSTITUTION:Various kinds of oxides (scum) 19 are developed on the surface 9a of molten metal 9. The scum 19 is shifted toward intersectional lines A, B of the casting rolls 2, 3 and the surface 9a by molten metal flow developed with rotation of the casting rolls 2, 3, but the shift thereof is prevented with the parting plates 12, 13 and this is not involved into the solidified shells 10, 12. The parting plate is constituted with heating refractory material 15 integrally composed of exothermic means 14 and refractory casing 16, and the refractory casing 16 is changed at suitable interval. As the parting plate 12, 13 is held to high temp. with the exothermic means 14, the scum 19 is not solidified to stick. Surface characteristic of the cast strip can be improved.

10. 发明专利

JPH02284748A COOLING DRUM FOR CASTING THIN BILLET 失效
公开(公告)号：JPH02284748A
公开(公告)日：1990-11-22
申请号：JP10537089
申请日：1989-04-24
申请人： NIPPON STEEL CORP , MITSUBISHI HEAVY IND LTD
发明人： FURUYA TAKASHI , TAKEUCHI HIDEMARO , MATSUMURA SHOGO , KASAMA AKIO , SASAKI KUNIMASA , YAMAMOTO KEIICHI
IPC分类号： B22D11/06
摘要： PURPOSE:To produce a thin billet having excellent surface characteristic by packing recessed parts formed on peripheral surface of a cooling drum with refractory to form a smooth surface. CONSTITUTION:The plural recessed parts 2 are formed on the peripheral surface of the cooling drum 1, and at the time of bringing the peripheral surface of the cooling drum 1 into contact with the molten metal, the recessed parts 2 form independent air gaps, which are not mutually connected. Therefore, cooling condition of the solidified shell growing on the peripheral surface in the cooling drum 1 is released to avoid the concentration of stress in a part, which locally has low rigidity. The refractory 6 is packed into the recessed part 2 and the peripheral surface in the cooling drum 1 is smoothly finished. Therefore, the contacting condition between the peripheral surface in the drum 1 and the molten metal, is made to uniform to the drum axial direction and rotational direction and it is unnecessary to give the molten metal vibration. By this method, the molten metal surface in pouring basin part is held to still and the solidification of the molten metal 4 and the growth of the solidified shell are executed under the stable condition and the obtd. thin billet is prevented from the generation of traverse wrinkle.

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