Nippon Kokan Kabushiki Kaisha

Yushiro Chemical Industry Co., Ltd.

Masayuki Hatanaka

Shinji Akita

Akira Uemura

Tatsuharu Oda

Noboru Kanda

Kenzou Yokoyama

Ken-ichi Aoki

A lubricant for the production of seamless tubes comprising water-insoluble fine synthetic resin particles, fine gilsonite and graphite, in which about 30 parts by weight of water-insoluble fine synthetic resin particles, from about 15 to about 30 parts by weight of fine gilsonite particles and from about 40 to about 55 parts by weight of fine graphite powder are contained.

Lubricant for the production of seamless tubes

In an apparatus for changing the rolling mill rolls and/or disk shoes of a steel pipe rolling mill, the top and bottom rolls vertically movably mounted in the housing are individually placed on a supporting bed positioned below the bottom rolling roll and moved in and out of the mill by way of rails laid in the lower part of the housing, and each of the disk shoes is mounted on a supporting arm which is movable vertically and rotatable thereby making it possible to change the disk shoes even during the operation.

Steel pipe rolling mill

In a three-roll Assel mill capable of automatically and rapidly changing the rolls, rails are arranged on an inner housing mounted within each of a fixed housing and a rotary housing to be rotatable along the inner wall thereof, and cradles having rolls mounted therein are placed on the rails, whereby during roll changing the housing proper is shifted and the inner housings are rotated in such a manner that the rails provided on the inner housings are successively aligned with rails laid externally and the rolls are moved in or out of the rolling mill.

The present invention relates to an apparatus for changing the rolling-mill rolls and disk shoes of steel pipe rolling mills. The apparatus comprises mechanisms for raising and lowering a top and bottom cradle each holding a roll of a rolling mill and a carriage disposed below the bottom cradle and movable transversely, whereby the cradles are moved in and out of the rolling mill housing transversely by the carriage, and a plurality of holding devices each rotatable about a fixed shaft are selectively positioned opposite to a pair of chocks holding a pair of disk shoes for movement in parallel motion thereby changing the disk shoes.

Growing community of inventors

Yokohama, Japan

Masayuki Hatanaka