FIELD: process engineering.
SUBSTANCE: invention relates to metal forming and may be used for production of hollow stepped parts. Preliminary and final two-sided piercing of billet is performed. Preliminary piercing is performed by piercer shaped to truncated cone. Piercer diameter ratio makes 8.0. For final piercing appropriate piercer is used with taper making 5°. Then, pierced billet is machined at appropriate tool.
EFFECT: lower costs.
2 dwg, 1 ex
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