METHOD OF PRODUCING BALL PINS Russian patent published in 2013 - IPC B21K1/46 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used for production of cup with flange parts. After cutting the billet, head is pre-upset, rod is pre-reduced and cone is formed at rod part adjoining cylinder part under head. Angle of cone being formed equals that of finished cone. Note here that in pre-reduction, conical section is formed by reduction to have length L_p≤d_in combine with upsetting of conical part with length L₀≤d_m where d_m is diameter of rod part adjoining ball head. Billet diameter d_bl is selected from the relationship d_bl=(0.8…0.95)d_m. At second position, second pre-upset of head and final reduction of rod are carried out along with cone forming. At third position, ball head if finally upset.

EFFECT: higher strength and quality.

1 dwg