Apparatus for manufacturing wrinkled pipes

摘要

Herein disclosed is a wrinkled pipe manufacturing apparatus in which an elastic member is inserted into a pipe to be worked and is pushed from at least one side so that it may be radially bulged to form an annular bulge on the circumference of the pipe and in which a punch and a chuck disposed around the circumference of the pipe are axially moved relative to each other to form a wrinkle from the annular bulge. The apparatus comprises: first and second mandrels held over a bed to move freely in the axial directions along the upper face of the bed and adapted to bear the pipe on their circumferences; first drive means for driving the mandrels in the axial directions; an elastic member arranged in the pipe and between the leading end faces of the first and second mandrels; second drive means for moving a punch and a chuck; and guide means for guiding the chuck and the punch in the axial directions on a concentric plane of the axis.