MATRIX FOR UPSETTING OF POLYHEDRAL PARTS Russian patent published in 2020 - IPC B21J13/02 B21K1/68 

FIELD: technological processes.

SUBSTANCE: invention relates to metal forming and can be used in production of polyhedral parts nut type. Upsetting matrix comprises a body, into which a conical insert with a polyhedral hole is pressed, and a cylindrical insert with a place for formation of a chamfer on the butt end of the nut, which is pressed into the band. Cylindrical insert with longitudinal grooves for removal of oil and contaminants is pressed into cylindrical insert. Band is pressed into the body and conical along the butt end with angle 1…3° between the cone generatrix and conical insert end face. On the cylindrical insert end and on the butt end and along the side surface of the bandage there are grooves for removal of oil and contaminants from the chamfering point on the nut end face.

EFFECT: result is higher cyclic resistance of matrix and quality of obtained articles.

1 cl, 2 dwg