| 摘要 |
<p>A fin pass molding apparatus having fin rolls arranged symmetrically with respect to a line center in a flow direction of a steel pipe to be molded, and a plurality of side rolls arranged in a plane perpendicular to this flow direction, at least one stand of fin rolls being mixed in a plurality of pairs of side rolls, a cluster mill comprising a lower roll and a plurality of pairs of side rolls mentioned above, and stands having a plurality of pairs of side rolls, the fin rolls provided in the cluster mill comprising fin rolls disposed on the work side and drive side, and a plurality of rolls which contact a steel pipe to be molded in arbitrary directions or in arbitrary positions in the circumferential direction of the same steel pipe, and which can mold fin passes, these rolls comprising a plurality of rolls arranged in a plane different from that of the flow direction of the steel pipe to be molded.</p> |
