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31. 发明专利

JP2000312957A MOLTEN METAL SURFACE LEVEL CONTROLLING METHOD OF CONTINUOUS CASTING MACHINE 失效
公开(公告)号：JP2000312957A
公开(公告)日：2000-11-14
申请号：JP12115299
申请日：1999-04-28
申请人： SUMITOMO METAL IND
发明人： HANAZAKI KAZUHARU , MURAKAMI TOSHIHIKO , OKA MASAHIKO
IPC分类号： B22D11/16 , B22D11/18 , G05D9/12
摘要： PROBLEM TO BE SOLVED: To precisely restrain fluctuation of non-stationary bulging property molten metal surface by including a filter element which optionally attenuates a non-stationary bulging frequency during a feedback loop of a molten metal surface level controlling system and, constituting the filter element with a notch filter of specific transmission function. SOLUTION: This invention is referred to a molten metal surface level control in a casting die for a continuous casting machine wherein a filter element is made to be a notch filter whose transmission function can be expressed by a formula. In the formula, ωstands for a notch angle frequency, g stands for a notch ratio and Q stands for a band region constant. Ranging for a specific band specific among the molten metal surface level controlling system feedback loop, the notch filter is included for optionally attenuating a frequency element, a molten metal surface level signal of continuous casting is analyzed with frequency spectrum at actual time and frequencies and amplitude at the plural peak elements caused by non-stationary bulging are extracted. Based on them, the notch frequency, the notch ratio of the notch filter and the band region constant are set for setting a proportional gain of the molten metal surface level controller.

32. 发明专利

JP2000042702A METHOD FOR CHANGING THICKNESS OF CAST SLAB 失效
公开(公告)号：JP2000042702A
公开(公告)日：2000-02-15
申请号：JP21762098
申请日：1998-07-31
申请人： SUMITOMO METAL IND
发明人： HANAZAKI KAZUHARU , MURAKAMI TOSHIHIKO , OKA MASAHIKO , KUMAKURA SEIJI
IPC分类号： B22D11/128 , B22D11/20
摘要： PROBLEM TO BE SOLVED: To obtain a cast slab having a mold thickness with a short length of unstable part from the thin cast slab by controlling a casting speed so that the solidified point of the cast slab comes to the outlet side of roll segments for rolling reduction, quickly raising the position of the roll segments for rolling reduction and pressing a hydraulic cylinder of the rolling reduction reaction force to the raising direction so as to balance with the dead wt. of the roll segments for rolling reduction reaction force. SOLUTION: Liquid is quickly supplied into the lower part of the hydraulic cylinder 3 from a control valve 4 for rolling reduction point of the hydraulic cylinder 3 for executing the positioning of the rolling reduction of the roll segments 2 for rolling reduction to set the reaction force of the hydraulic cylinder 8 for rolling reduction reaction force of the roll segments 7 for rolling reduction reaction force to zero. Then, at the time of pressing the hydraulic cylinder 8 for rolling reduction reaction force into the rising direction so as to balance with the dead wt. of the roll segments 7 for rolling reduction reaction force, the cast slab returned back to the mold thickness can be passed through among the roll segments for rolling reduction reaction force. At the time of opening the roll segments in the state that the solidified point of the cast slab is at the outlet side of the roll segments 2 for rolling reduction, the cast slab is bulged with the static iron pressure at the non-solidified portion and returned back to the target thickness and kept to the mold thickness.

33. 发明专利

JPH1110300A METHOD FOR SUPPLYING MOLTEN STEEL IN MOLD FOR CONTINUOUS CASTING MACHINE 失效
公开(公告)号：JPH1110300A
公开(公告)日：1999-01-19
申请号：JP16722397
申请日：1997-06-24
申请人： SUMITOMO METAL IND
发明人： OKA MASAHIKO , HANAZAKI KAZUHARU , KOIDE MASAKAZU , MURAKAMI TOSHIHIKO
IPC分类号： B22D11/18 , B22D11/10
摘要： PROBLEM TO BE SOLVED: To eliminate the error at the time of adjusting a stopper and to accuretely control the surface level of molten steel by changing over the hydraulic pressure in a cylinder for driving a stopper pressing the tip part of the stopper onto an upper nozzle to a lower pressure than that at the time of supplying the molten steel and returning back into the same hydraulic pressure as the pressure at the time of supplying the molten steel after zero-setting the stopper, at the time of zero-setting the stopper before starting the supply of the molten steel. SOLUTION: The stopper 1 for adjusting the molten steel supplying quantity is driven with the cylinder 4 for driving the stopper through a stopper arm 2 and a rod 3 to control the elevating/lowering position thereof. The hydraulic pressure of a pump line (P line) 6 to the cylinder 4 for driving the stopper is changed over into the low pressure or the high pressure with a pressure change-over valve 10. At the time of zero-setting, the cylinder 4 for driving the stopper is driven at the low pressure and the stopper is positioned with a guide valve driven with a stopping motor 5. After zero-setting, the pressure of the pump line (P line) 6 is changed over to the high pressure so as not to damage the response at the time of controlling.

34. 发明专利

JPH1110285A MOLD FOR CONTINUOUS CASTING AND CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH1110285A
公开(公告)日：1999-01-19
申请号：JP16453697
申请日：1997-06-20
申请人： SUMITOMO METAL IND
发明人： MURAKAMI TOSHIHIKO , KOIDE MASAKAZU , MIZUKAMI HIDEO , HANAZAKI KAZUHARU , OKA MASAHIKO
IPC分类号： B22D11/04 , B22D11/055
摘要： PROBLEM TO BE SOLVED: To enable heat extraction performance to be adjusted in a wide range by arranging a plurality of heat extraction adjusting holes toward the casting direction between water passages for cooling and an inner surface of a mold at the upper part of the mold, stopping the water flow into the heat extraction adjusting holes at the time of casting a middle carbon steel to make a hollow part and flowing the water into the heat extraction adjusting holes at the time of casting a low carbon steel. SOLUTION: A plurality of water passages 2 for cooling, is arranged in parallel with the casting direction in the whole periphery of the mold 1, at the back surface of the mold 1. A plurality of heat extraction adjusting holes 4 is arranged in parallel with the casting direction between the water passages 2 for cooking and the inner surface 3 of the mold. The heat extraction holes 4 are arranged in a distance Z1 to Z2 in the casting direction from the upper end of the mold 1 and a distance L from the inner surface 3 of the mold and at the position having a distance M from the perpendicular line lowered to the inner surface 3 of the mold from the water passages 2 for cooling. It is desirable that the diameter of cross section of the heat extraction adjusting hole 4 is 5-10 mm at Z1=50-70 mm, Z2=150-250 mm and L=50-70%×(the distance between the water passage 2 for cooling and the inner surface 3 of the mold).

35. 发明专利

JPH115145A INTEGRATED SOAK NOZZLE AND MANUFACTURING METHOD THEREOF 失效
公开(公告)号：JPH115145A
公开(公告)日：1999-01-12
申请号：JP11283798
申请日：1998-04-09
申请人： TOSHIBA CERAMICS CO , SUMITOMO METAL IND
发明人： MOCHIZUKI YOICHIRO , FUSHIMI TETSUO , HASEBE NOBUHIRO , HASHIO MORINORI , MURAKAMI TOSHIHIKO , HIRASHIRO TADASHI
IPC分类号： B22D41/56 , B22D11/10 , C09J11/04 , C09J161/06
摘要： PROBLEM TO BE SOLVED: To replace a nozzle without interrupting casting while realizing high accuracy, strength and a high anti-spalling characteristic by providing a nozzle wherein a plate member and a nozzle member are formed separately and followed by firing. Then, they are cemented each other with an organic glue. The nozzle member's flow channel is flat in a cross section. SOLUTION: The plate member 12 and the nozzle member 11 are formed and firing-processed separately, wherein at least one end of cross section of the nozzle member's flow channel for molten steel is made flat. The junction of both the members 11, 12 is cemented with an organic glue layer 16. The plate member 12 is composed of alumina-carbon or zirconia-carbon material, which has high strength and a good sliding characteristic. The nozzle member 11 is composed of alumina-graphite or zirconia-graphite material, which has a high anti-spalling characteristic. At the inner radius around the junction of the plate member 12 and the nozzle member 11, a ring 28 made of firebrick is fixed with mortar. At the outer radius of the plate member 12 and the nozzle member 11, an iron shell 19 is fixed with mortar to form an integrated soak nozzle.

36. 发明专利

JPH0994635A METHOD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH0994635A
公开(公告)日：1997-04-08
申请号：JP25324295
申请日：1995-09-29
申请人： SUMITOMO METAL IND
发明人： MURAKAMI TOSHIHIKO , MATOBA YOSHIYUKI , KOIDE MASAKAZU , KAJIWARA KOJI , TAKATANI KOJI
IPC分类号： B22D11/00 , B22D11/04 , B22D11/055 , B22D11/059 , B22D11/22
摘要： PROBLEM TO BE SOLVED: To prevent the development of surface flaw on a cast slab and to improve a casting velocity by slowly cooling a mold, at the time of continuously casting particularly, a medium carbon steel. SOLUTION: The surface temp. of mold copper plates 1aa, 1ba within 200mm at the lower part from a meniscus is held to 350-550 deg.C. As the concrete means, the mold making thicker the thickness of the mold copper plates 1aa, 1ba within 200mm at the lower part from the meniscus than the thickness of the mold copper plates 1aa, 1ba at the other part, or the mold changing the material of the mold copper plates 1aa, 1ba within 200mm at the lower part from the meniscus to the material at the other part are used or the flowing velocity/temp. of mold cooling water supplied within 200mm at the lower part from the meniscus are changed to the flowing velocity/temp. of the mold cooling water at the other part.

37. 发明专利

JPH0890187A METHOD FOR CONTINUOUSLY CASTING THIN CAST SLAB AND APPARATUS THEREOF 失效
公开(公告)号：JPH0890187A
公开(公告)日：1996-04-09
申请号：JP17588595
申请日：1995-07-12
申请人： SUMITOMO METAL IND
发明人： TAKEUCHI ISAMU , YAMANAKA AKIHIRO , OKAMURA KAZUO , SHIMIZU HIROYASU , KANAZAWA TAKASHI , KUMAKURA SEIJI , KOIDE MASAKAZU , MURAKAMI TOSHIHIKO , WATABE TADAO
IPC分类号： B22D11/124 , B22D11/12 , B22D11/128 , B22D11/16 , B22D11/20
摘要： PURPOSE: To restrain the total accumulated strain to small and to produce a thin cast slab preventing the internal crack even in the case of unsolidified rolling reduction under high speed casting condition by applying the rolling reduction ratio with the rolling rolls at the upstream side at higher than the rolling reduction rate with the rolling rolls at the downstream side. CONSTITUTION: In a continuous casting apparatus, plural pairs of rolling rolls 51 -515 enabling the rolling reduction in each roll pair unit arranged in the interval from just below a mold to the perfect solidification are arranged. In the case of using Pk (k is No. of the rolling roll pair) for the rolling reduction rate per one pair of the rolling roll, the large rolling reduction rate P1 is given to the rolling roll pair 51 at the most upstream side in the continuous casting apparatus, and the rolling reduction rate Pk of the rolling roll pair 5k is gradually reduced. That is, the unsolidified rolling reduction is applied under condition of P1 >=P2 >=P3 ...>=P15 (wherein, it is excluded that all rolling reduction rates are equaled) and thus, the max. value of the total accumulated strain can be restrained to lower than the limited strain and the prevention of the internal crack can be achieved.

38. 发明专利

JPH0847759A METHOD FOR CONTINUOUSLY CASTING WIDE AND THIN CAST SLAB 失效
公开(公告)号：JPH0847759A
公开(公告)日：1996-02-20
申请号：JP18608994
申请日：1994-08-08
申请人： SUMITOMO METAL IND
发明人： KOIDE MASAKAZU , KANAZAWA TAKASHI , MURAKAMI TOSHIHIKO , HIRASHIRO TADASHI , KUMAKURA SEIJI
IPC分类号： B22D11/10 , B22D11/128 , B22D11/20
摘要： PURPOSE:To provide a method for obtaining the aimed thickness of a cast slab while following the change of casting speed at the tip part and also, at the rear end part of the cast slab, in a positively executing method of the rolling reduction to the unsolidified part of the cast slab after the outlet side of a mold in order to produce the cast slab having thinner than the thickness at the outlet side of the mold in the continuous caster. CONSTITUTION:In the casting method with the rolling reduction to the unsolidified part, at the same time of passing a dummy bar head, the constant pressing force is applied to roll group at the time of starting the continuous casting. In the other hand, at the time of completing the continuous casting, the casting speed is lowered and also, the rolling reduction zone is shifted to the mold 3 side in order, and a seal cap 24 is inserted into the cast slab 5 in the interval when the rear end part of the cast slab is in the mold, or dummy shell 44 is inserted in the mold 3 to execute the rolling reduction together with the dummy shell 44 at the bottom part.

39. 发明专利

JPH04238656A METHOD FOR REUSING TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH04238656A
公开(公告)日：1992-08-26
申请号：JP1275291
申请日：1991-01-09
申请人： SUMITOMO METAL IND
发明人： KAJIWARA KOJI , MURAKAMI TOSHIHIKO
IPC分类号： B22D11/10
摘要： PURPOSE:To prevent oxidation of a little remained material and the development of flaw in a slab or a product by burning fuel gas for heating under the condition that the air used for burning is smaller in quantity than the theoretical air quantity at the time of melting and removing the remained steel and steel slag in order to reuse a tundish. CONSTITUTION:At the time of melting and removing the steel and the steel slag 13 remained in the tundish 7 by heating in order to reuse the tundish 7 after continuous casting, the quantity of air 3 enriching oxygen used for combustion of fuel gas 2 for heating is lessen than the theoretical air quantity required for perfect combustion thereof to burn the fuel gas 2. Therefore, the steel and the steel slag remained in the tundish 7 are quickly removed and also a small quantity of the remained material is not oxidized and the flaw in the slab or product caused by the remained oxide is not developed in the following charge and good quality in the product is obtd.

40. 发明专利

JPH03110049A BEARING DEVICE FOR DIVIDED ROLL FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH03110049A
公开(公告)日：1991-05-10
申请号：JP24858389
申请日：1989-09-25
申请人： SUMITOMO METAL IND
发明人： MURAKAMI TOSHIHIKO
IPC分类号： B22D11/128
摘要： PURPOSE:To improve the generation of roll deformation of roller apron, bulging of a cast slab between rolls and lowering of service life of roll bearing accomanying high velocity casting by forming intermediate bearing for adjacent rolls with T shape block to use this in common with both rolls. CONSTITUTION:The bearing device 9 works as bearing for the rollers 31a, 31b in the roller apron in continuous casting equipment. Further, the bearing device 9 is composed of the T-shape block 91 and the bearings 92. The block 91 supports end parts of the rolls 31a, 31b at right and left sides as rotatable through the bearings 92 and fixed to the roller apron body 32, and by setting the block shifting to each set of the rolls 31a, 31b related to width direction of the cast slab 7, the adverse effect of the bulging caused by arrangement of the bearing device 9 is reduced. Further, by the bearing device 9, deflection curve in connecting part of the rolls comes to continuous line. Therefore, the bulging between the rolls is effectively restrained and the service life of bearing can be drastically improved.

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