Confined axial ring rolling (CARR) of cylindric parts with irregular sockets on inner wall

Cylindric parts with complex sections have extensive applications, but the deep cylindrical structure and intricate cross-sectional profile make it challenging to form these parts by traditional technologies such as profile ring rolling or forging. This study proposes an innovative process called Confined Axial Ring Rolling (CARR), charactered by exerting axial load on the revolution blank using a rotating conical roll to incrementally obtain the desired cross-section with the cooperation of die cavity. The CARR of an Al7075 cylindric part with irregular sockets on the inner wall was investigated by numerical simulation and physical experiment. The effects of main processing parameters on the filling of die cavity were examined. The results prove that CARR can precisely form cylindric parts with irregular sockets on the inner wall under low force. The die cavity filling is significantly influenced by the friction coefficient between the conical roll and the blank, as well as the feeding distance of the conical roll.