公开(公告)号：EP0729798A4

公开(公告)日：1999-01-07

申请号：EP95929214

申请日：1995-08-23

申请人： NIPPON STEEL CORP ,  ASAI SHIGEO

发明人： ASAI SHIGEO ,  TOH TAKEHIKO ,  WAJIMA KIYOSHI ,  SAWADA KENZO ,  TAKEUCHI EIICHI ,  SASSA KENSUKE ,  LI TINGJU

IPC分类号： B22D11/115 ,  B22D11/10

CPC分类号： B22D11/115

摘要： A method of continuously casting a molten metal, capable of minimizing the unstability of initial solidification of a molten metal and stably attaining the improvement of the performance of being lubricated of a cast piece and the property of the surface thereof, and an apparatus for embodying the method. A method of continuously casting a molten metal, wherein a molten metal is poured into a mold, which is vibrated or not vibrated in a predetermined mode, with an alternating current supplied to an electromagnetic coil provided so as to surround a wall of the mold or an electromagnetic coil buried in a side wall thereof, continuous casting being carried out as an electromagnetic force is applied to the molten metal which is about to start being solidified, characterized in that the amplitude or waveform of the alternating current supplied to the molten metal is varied periodically; and an apparatus for embodying the method.

公开(公告)号：EP0972591A4

公开(公告)日：2004-11-03

申请号：EP98957226

申请日：1998-12-08

申请人： NIPPON STEEL CORP

发明人： SASAI KATSUHIRO ,  TAKEUCHI EIICHI ,  HARADA HIROSHI ,  HASEGAWA HAJIME ,  TOH TAKEHIKO ,  FUJISAKI KEISUKE

IPC分类号： B22D11/115 ,  B22D11/10

CPC分类号： B22D11/041 ,  B22D11/115 ,  B22D11/20 ,  Y10T428/12 ,  Y10T428/12458 ,  Y10T428/12472 ,  Y10T428/12576 ,  Y10T428/12958 ,  Y10T428/12965

摘要： A method and an apparatus for continuously casting a molten metal, adapted to apply to a molten metal vibration generated by a shifting magnetic field which improves an equiaxed crystal ratio, and which can further refine an equiaxed crystal, without causing a surface discontinuity ascribed to powder inclusion to occur; and a cast piece, characterized by a casting process for manufacturing a cast piece, comprising injecting a molten metal into a casting mold while applying an electromagnetic force from an electromagnetic coil, which is provided in the vicinity of the casting mold, to the molten metal, to solidify the same, wherein a shifting magnetic field generated by a magnetic coil provided in the vicinity of a molten metal pool in the casting mold is applied to the molten metal which is being withdrawn in the downward direction as it is completely solidified, or cool-solidified in the casting mold, to a degree within a range not exceeding an absolute value of a predetermined velocity of flow, by subject the molten metal to a high and low accelerations and combining direction vectors of the same direction of high and low accelerations or direction vectors of an opposite direction thereof, to vibrate the molten metal.

摘要翻译： 本发明提供了一种连续铸造方法，其中通过移动磁场对熔融金属进行振动，从而可以提高等轴晶体比，并且可以使等轴晶体细化而不产生由粉末捕获引起的表面缺陷 。 此外，本发明提供了一种应用连续铸造方法的装置。 此外，本发明提供了通过上述方法和装置制造的铸造板坯。 铸造熔融金属的方法包括以下步骤：将熔融金属浇注到模具中并将其固化在模具中，同时施加由布置在模具中的熔融金属池附近的电磁线圈产生的电磁力， 熔融金属; 并且通过由电磁线圈产生的移动磁场使熔融金属在模具中固化或者被从模具向下拉出而被冷却固化的熔融金属振动，使得熔融金属被高强度加速， 当相同方向或相反方向上的高加速度和低加速度的方向矢量彼此组合时，在不超过预定流速的范围内的低强度加速度。

公开(公告)号：EP0750958A4

公开(公告)日：1999-03-10

申请号：EP95905764

申请日：1995-01-12

申请人： NIPPON STEEL CORP

发明人： FUJISAKI KEISUKE ,  WAJIMA KIYOSHI ,  UMETSU KENJI ,  SAWADA KENZO ,  UEYAMA TAKATSUGU ,  TOH TAKEHIKO ,  OKAZAWA KENSUKE ,  OKUMURA YASUSHI

IPC分类号： B22D11/115 ,  B22D11/10

CPC分类号： B22D11/115

摘要： A method of and an apparatus for continuously casting slabs of a metal, such as steel which do not have defects, such as vertical cracks on a surface thereof, by uniformly turning a molten metal in a meniscus plane in a mold. In a meniscus plane, the electromagnetic agitating thrusts applied along two longer sides of the mold are directed contrariwise, and a thrust directed from an immersed nozzle toward the shorter sides of the mold is set larger than that directed from the shorter sides of the mold toward the immersed nozzle. A circuit connecting each coil of an electromagnetic agitation coil unit of a shafting magnetic field system and a three-phase power source together is point symmetric with respect to the immersed nozzle and relative to the two longer sides of the mold and is divided into two portions on each longer side of the mold, and the divided portions are parallel to each other and have different impedances.

公开(公告)号：EP0760480A4

公开(公告)日：1997-06-18

申请号：EP96906022

申请日：1996-03-14

申请人： NIPPON STEEL CORP

发明人： UMEZAWA KAZUSHIGE ,  SUZUKI TOKIO ,  CHIBA KOICHI ,  UEMORI RYUJI ,  TOH TAKEHIKO ,  KONDO HIROYUKI ,  FUCHIGAMI KATSUHIRO ,  TAKEUCHI EIICHI ,  WAKOH MASAMITSU ,  ONO AKIHIRO

IPC分类号： G01N33/20

CPC分类号： G01N33/206 ,  G01N33/20 ,  Y10T436/20 ,  Y10T436/25375

摘要： In order to rapidly and inexpensively evaluate cleanliness of a metal with a good representativeness when an amount, composition and the like of non-metallic inclusion particles existent in a metal and leading to defective products are to be evaluated based on samples picket up during the manufacture of the metal, an amount of non-metallic inclusion is identified by levitation melting metallic pieces for a predetermined period of time by means of a cold crucible levitation melting device, discharging non-metallic inclusion particles existent in the metal to a melting body surface, and measuring or analyzing amounts of elements, which constitute the non-metallic inclusion particles, by subjecting a curved and non-flat surface of a sample after solidification to direct analysis, which is performed based on a fluorescent X-ray analyzing method using an energy dispersion type spectrometer, and other chemical or physical measurement.

公开(公告)号：EP0774314A4

公开(公告)日：1999-08-18

申请号：EP96907730

申请日：1996-03-29

申请人： NIPPON STEEL CORP

发明人： UMEZAWA KAZUSHIGE ,  TOH TAKEHIKO ,  TANAKA MAKOTO ,  TAKEUCHI EIICHI ,  INOMOTO TAKEO

IPC分类号： B22D11/16

CPC分类号： B22D11/16

摘要： A mathematical model and a means for rapidly analyzing non-metallic inclusion in steel by means of, e.g., a cold crucible method are combined to simulatingly calculate the behavior of the non-metallic inclusion and thereby to predict the quality of a cast article on-line. Further, continuous casting process variables are controlled to suppress the amount of non-metallic inclusion in the cast piece to a minimum.

摘要翻译： 通过例如冷坩埚方法快速分析钢中的非金属夹杂物的数学模型和方法被组合以模拟非金属夹杂物的行为，从而预测铸造件的质量， 线。 此外，控制连续铸造工艺变量以将铸件中的非金属夹杂物的量抑制到最小。

公开(公告)号：EP0707909A4

公开(公告)日：1997-10-29

申请号：EP94910564

申请日：1994-03-29

申请人： NIPPON STEEL CORP

发明人： HARADA HIROSHI ,  TAKEUCHI EIICHI ,  TOH TAKEHIKO ,  ISHII TAKANOBU

IPC分类号： B22D11/11 ,  B22D11/115 ,  B22D11/10 ,  B22D11/18

CPC分类号： B22D11/115

摘要： This invention relates to a method of controlling a flow in a casting mold in a DC magnetic field, in which the casting of steel is done continuously as a flow of molten steel discharged from a nozzle is controlled by applying a DC magnetic field having substantially uniform magnetic flux density distribution in the entire widthwise direction of a casting mold to the casting mold in the direction of the thickness thereof, characterized in that the meniscus velocity of flow on the surface of the molten steel in the casting mold is controlled within a range of 0.20 - 0.40 m/sec by regulating an ejection angle of the nozzle, position of the magnetic field and a magnetic flux density. When the meniscus velocity of flow is increased greatly, a control operation is carried out in accordance with the following equation (1): Vp/Vo = 1 + alpha 1{1-exp(- beta 1.H )} by dashing an ejection flow from the nozzle directly against a shorter wall of the casting mold, and, when the meniscus velocity of flow is increased or reduced, a control operation is carried out in accordance with the following equation (2): Vp/Vo = 1 + alpha 2{sin( beta 2.H)exp(- gamma .H)} by dashing an ejection flow from the nozzle against a shorter wall of the casting mold after passing it through a magnetic field zone. In equations (1) and (2) H = 185.8.B .D.T/(D+T)V.

摘要翻译： 本发明涉及一种在直流磁场中控制铸模中的流动的方法，其中钢的铸造是通过施加基本上均匀的直流磁场来控制的，因为从喷嘴排出的钢水流被控制 在铸模的厚度方向上铸模的整个横向方向上的磁通密度分布，其特征在于，铸模中钢水表面上的弯液面速度被控制在 通过调节喷嘴的喷射角度，磁场位置和磁通密度来确定0.20-0.40m / sec。 当流量的弯液面速度大大增加时，根据以下等式（1）进行控制操作：Vp / Vo = 1 +α1a1-exp（-β1H2）ü通过冲击 喷嘴直接喷射到铸模的较短壁上，当流动的弯液面速度增加或减小时，根据下列等式（2）执行控制操作：Vp / Vo = 1 + 通过在通过磁场区域之后将来自喷嘴的喷射流喷射到铸模的较短壁上，从而将α2α（β.H）exp（-γ.H）ü。 在等式（1）和（2）中，H = 185.8B <2> .D.T /（D + T）V。