Engineers are forced to come up with better prognoses for forming processes. Therefore, it is important to provide a practical and efficient method to predict deformation behaviours. describe flow forming generally as an incremental forming process for tubes. One process modification, postulated by, is ball spinning. Similar to a ball bearing, the balls are controlled by a cage (Fig. 1). The diameter of the tube or rod is reduced by the rotating balls and is adjusted by the diameter of the leading ring.