METHOD FOR MAKING BALL-HEAD PINS Russian patent published in 2003 - IPC

Abstract RU 2212973 C1

FIELD: cold plastic metal working, possibly manufacture of parts such as ball-head pins. SUBSTANCE: method comprises steps of cutting off blank; first and second operations of upsetting head; finally reducing rod and finally upsetting ball head; simultaneously at preliminarily reducing rod and cone during first transition of upsetting operation, reducing underhead cylindrical portion whose diameter is equal to final diameter of underhead of ready part; selecting diameter of blank in range (1.05 - 1.1)dcyl, where dcyl - diameter of cylindrical portion of underhead of ready part. EFFECT: enhanced strength of tool, improved quality of ready parts. 1 dwg

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RU 2 212 973 C1

Authors

Zakirov D.M.

Valiev R.Sh.

Nurkaev I.B.

Dates

2003-09-27Published

2002-04-29Filed