Method for making chime structure for blow molded hollow member

摘要

The invention sets out a method and apparatus of forming a chime projecting radially outwardly of a blow molded hollow member. The chime is formed immediately after the blow molding of the hollow member by forming a radially outwardly projecting channel-shaped part in the side wall of the hollow member. The surfaces of the channel-shaped part are moved toward each other to form a welded connection at the radially inner end of the channel-shaped part. The movement of the channel-shaped part to form the chime is effected by telescoping slides which move axially at different stroke speeds and at different stroke lengths. The radially inwardly most disposed slide moves farthest and faster so as to produce a rolling movement of the channel-shaped part as the chime is formed. The resulting chime is integrally formed from the material of the hollow member and includes at least an outer wall extending circumferentially around the hollow member and a side wall to which the outer wall is welded at its inner radial end.