7HUA L, ZHAO Z Z. The Extremum Parameters in Ring Rolling[J]. Journal of Materials Processing Technology, 1997,69(1 - 3) : 273 - 276.
8HAWKYARD J B, MOUSSA G. Studies of Profile Development and Roll Force in Profile Ring Rolling [C]. In: proc 3rd Int Conf On ROMP, Kyoto,Japan, 1984:267-278.
