METHOD OF LONG-LENGTH BLANKS FORGING Russian patent published in 2008 - IPC B21J5/02 B21J13/02 

FIELD: metallurgy.

SUBSTANCE: forging is performed in several passes by means of an upper flat and a lower cut out strikers. The lower striker has an impression in a shape of a scalene triangle. During the first pass a blank by compression is shaped into a scalene triangle with an obtuse angle 100-105° and a lesser acute angle 29-34°. During the following passes the blank is placed in the same strikers with support of a lesser side of the triangle of its cross section on a bigger side of a scalene triangle of cross section of the impression of the lower striker.

EFFECT: risk of defect formation is excluded.

12 dwg, 6 ex