Method and apparatus for making metallic, non-rotationally symmetric rings

摘要

In a method of making a metallic, non-rotationally symmetric ring with substantially constant wall thickness about its circumference, in particular a cam ring, from a circular ring, a circular ring is mechanically machined on both inner and outer sides with an edge-shortening form element and then intermittently fed by a transport belt to an area between two continuously closing and opening die members. The transport belt is hereby positioned with its upper strand below the die members. After closing the die members, the circular ring is shaped through cold forming to a non-rotationally symmetric shape whereby the die members continue to maintain the closed position momentarily before being opened for removal of the non-rotationally symmetric ring from the area between the die members.