Increasing Punch Life in Cold Cup Extrusion with Active

A. M. Dmitriev, N. V. Korobova, and I. A. Yakubovskaya

Stankin Moscow State Technological University


Abstract—The stress at the end surface of the punch in the cold extrusion of a U-shaped hollow cylinder
(acup) is determined by modeling with regression equations. The results of such extrusion with active and reac-
tive friction at blank–matrix contact are compared. With active friction, the punch life is greater by a factor of

Keywords: cold extrusion, metal cups, stress, blank, modeling, resistance, punch life

DOI: 10.3103/S1068798X15120060

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