Increasing Punch Life in Cold Cup Extrusion with Active
Friction

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

Stankin Moscow State Technological University

e-mail: yakubovskaya1990@yandex.ru

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
1.5.

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

DOI: 10.3103/S1068798X15120060

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