By co mparing friction coefficient determined with friction coeffi-cient between forged dies and workpi eces,a coating that is selected corr ectly can be employed to dry forming.

• 测出的摩擦因数数值与目前冷锻时模具与工件间的摩擦因数数值相比,可认为涂层选择适当后,完全可以进行干成形。