MULTIFACE ARTICLE UPSETTING DIE Russian patent published in 2011 - IPC B21J13/02 B21J5/08 B21K1/64 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in producing, for example, chamfered nuts. Die comprises body with two taper inserts press-fitted therein. One of said inserts has multiface bore. Second insert has nut face chamfer forming seat arranged at an angle. Said insert with nut face chamfer forming seat has cylindrical inserts press-fitted therein to have its outer surface jointed with aforesaid seat surface. Insert has lengthwise channels made on its outer surface to remove oil and dist from aforesaid joint.

EFFECT: higher hardness of die and quality of products, reduced consumption of tool steel.

2 dwg