Method and device for shaping by hammering a corrugated tube and the application thereof to tubes for the automobile industry

摘要

A shaping device for corrugating a tube includes at least one mandrel which is radially expansible and has a body associated with at least one relatively resilient arm which carries on its surface an impression whose profile corresponds to the profile of the corrugation to be obtained, and an axially movable locking member for causing the mandrel to move from a retracted position to an outer position in which the locking member immobilizes the mandrel, and hammers. The hammers, the tube and the mandrel-locking member are adapted to be subjected to relative rotations about their common longitudinal axis.