Kawasaki Steel Corporation

Kuraray Co., Ltd.

Takemi Yamamoto

Osamu Furukimi

Saiji Matsuoka

Masahiko Morita

Tsuguhiko Nakagawa

Toshio Fujimura

Arata Ueda

Ryoichi Morimoto

Ikuo Ueda

Jun-ichi Matsuno

Takashi Sekita

Kazuo Aso

Takesaburo Nishioka

Junichi Hasunuma

Naomichi Miyai

Hisashi Osanai

Ryosuke Yamaguchi

Taro Yahiro

Kiyozi Hashimoto

Tsuyoshi Shimatani

Steel having excellent workability and deep drawability is produced by an electric furnace-vacuum degassing process. The steel has a composition which comprises about:

Steel, steel sheet having excellent workability and method of producing

Non-oxidizing heating method and apparatus

The casting apparatus for a hollow steel ingot is constructed such that: at least three concentric pipes are provided in the central portion of an ordinary mold for a steel ingot; a core is formed by filling up a space formed between the first outer-most pipe having the largest diameter and the second pipe disposed inwardly of the first pipe with granular refractory material wherein zircon or chromite sand is bound by a binder such as an organic resin; a double pipe is disposed inwardly of said core and forming a gas flow course for cooling the core; and pouring gates formed through the stool for feeding molten steel at an intermediate portion between the inner wall of said mold and the core. The method for producing a hollow steel ingot by use of the casting apparatus as described above comprises: blowing the cooling gas from above into the third inner-most pipe having the least diameter, passing the gas through the second pipe from below and discharging it to above; cooling the molten steel fed into the mold and brought into contact with the outer surface of the first pipe by cooling the core through the inner wall of the second pipe; and controlling the cooling conditions for the core such as the thickness of the cylindrical refractory material of the core, the cross-sectional area of the cooling gas flow course and the thickness of the second pipe so that the finally solidifying position of the molten steel fed can be set at a position which is apart from the core side at a distance of 20 to 50% of the wall thickness of the hollow steel ingot to be formed.

Method of producing hollow steel ingot and apparatus therefor

This invention relates to an apparatus for conveying cops and bobbins for directly connecting a ring frame with a winder wherein one operation to feed those cops which are doffed onto the transport-bands on both the right and left sides of the ring frame to the subsequent process from one end of each of the transport-bands and the other operation to receive bobbins needed for the next doffing onto the transport-band are together simultaneously performed, with these two simultaneous operations being repeated. This invention has no provision of a random stock zone and the substantial function of bobbin stock is given to the transport-band, and the bobbin returned from the winder is adjusted in alignment thereof by the bobbin aligning device and conveyed by the bobbin stock conveyor and dropped onto the transport-band.

Apparatus for conveying cops and bobbins for directly connecting ring

Growing community of inventors

Okayama, Japan

Takemi Yamamoto