Hitachi, Ltd.

Toru Nakayama

Michimasa Takagi

Kinpei Okano

Seishi Watahiki

Takashi Norikura

Seiichi Kurita

In a cluster type split housing type rolling mill, the plate thickness control capability is improved by maintaining maximum mill rigidity. An upper inner housing supporting an upper group of rolls is supported at two points in a rolling pass direction at upper outer housing sections. A lower inner housing supporting a lower group of rolls is supported at a single point in the rolling pass direction at lower outer housing sections. The upper and lower housings have different levels of vertical rigidity.

Cluster type multistage rolling mill

In a tandem rolling mill facility and a rolling method using the tandem rolling mill facility, stable rolling is performed with suppressing deflection of working rolls and without fluctuation of working roll bearing boxes. Axes of working rolls are offset toward a side opposite to a side of larger tension between tensions acting on a rolled material at an inlet side and an outlet side with respect to axes of intermediate rolls, and a hydraulic cylinder for pushing a working roll bearing box toward the same side as the offset direction is contained in a block.

Tandem rolling mill facility and rolling method using the same

A vertical type antifriction bearing device which includes an antifriction bearing using balls or rollers as rolling members. This bearing device features that, during operation, the level of lubricating oil is maintained below the antifriction bearing allowing the feed of lubricating oil to the antifriction bearing in a suitable amount, and that during the stoppage of operation, the level of the lubricating oil is raised above the antifriction bearing, whereby during the stoppage of operation the antifriction bearing is shielded from atmosphere or moisture to prevent the corrosion thereof and, during the operation, the agitation loss caused by the lubricating oil is minimized.

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Hitachi, Japan

Toru Nakayama