Nippon Steel Sumitomo Metal Corporation

Yusaku Kobayashi

Hideki Uchida

Daisuke Hirota

Koichi Kondo

Yugo Matsui

Shinji Kamoto

Shunji Matsuzaki

A forging roll device includes, a pair of roll axes which are provided so that an axis center of each of the roll axes are parallel to each other and in which a die is attached to each of the roll axes; and a material holder/conveyer which conveys a held shaping target material between the pair of roll axes, wherein, each one of the pair of roll axes includes a plurality of die attaching surfaces positioned in a circumferential direction, and an outer circumferential surface between any of two of the plurality of die attaching surfaces in each one of the pair of roll axes is closer to a planar surface than a cylindrical surface with the axis center as the center.

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Tokyo, Japan

Yusaku Kobayashi