Title:
PIERCING METHOD IN PRESS PIERCING MILL
Document Type and Number:
Japanese Patent JPS53132453
Kind Code:
A
Abstract:
PURPOSE: To reduce the indenting force to the utmost, and also, to prevent the bulging at the inelt side, by piercing the billet while maintaining constant the indenting velocity for the billet from the backside, and besides, by controlling the circumferential velocity at the groove bottom of the rolling roll to the specified condition.
Inventors:
YAMADA TAKEO
HAYASHI CHIHIRO
HAYASHI CHIHIRO
Application Number:
JP4805777A
Publication Date:
November 18, 1978
Filing Date:
April 25, 1977
Export Citation:
Assignee:
SUMITOMO METAL IND
International Classes:
B21B17/00; B21B17/08; (IPC1-7): B21B17/00
Domestic Patent References:
| JPS5224970A | 1977-02-24 |