METHOD FOR THE LOCAL DEFORMING OF ROUND TUBES INTO TUBES WITH FLAT SIDES, AND DIE FOR DOING THE SAME

摘要

The forming punch (18) comprises two planar surfaces (20, 22) interconnected by an edge (23), two portions of a cylinder which passes through the edge (23) and a curved surface centered on this edge. This punch (18) is inserted in the tube to the point of the tube to be deformed and then the tube is compressed between a V-shaped groove (34) in a die (36) and a curved groove (40) in a compression member (38). The punch (18) is thereafter withdrawn from the tube by axially sliding the punch out of the latter.