(57) A method of rolling transverse ribbed tubes consists in that the rib (11) after forming
is deflected in the direction of rolling parabolically, the external tube (4) is pressed
down to the core tube (5), and deflecting the rib (11) and pressing down the external
tube (4) to the core tube (5) is carried out during one revolution of the tube, and
afterwards the rib is straightened.
A set of toots for rolling transverse ribbed tubes has three tools provided with roll-formed
disks (6, 7, 8, 9), supporting and straightening, whereby the second - in the direction
of rolling - part of the profile of supporting disks is concave, preferably parabolically,
and the last - in the direction of rolling - tool is provided with a supporting disk
of the outer diameter bigger by from 0.1 to 0.8 mm from the outer diameter of the
other supporting disks.
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