B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
80/13
B21B 17/04 (2006.01) B21B 17/08 (2006.01)
Patent
CA 1036394
Abstract of the Disclosure Press roll piercing method which comprises applying pressing force to a polygonal metal billet in its axial direction while guiding the billet by means of a guide to advance, rolling corner portions of the billet to a certain degree with a pair of rolling rolls having semicircular grooves disposed in the vertical direction prior to the contacting of a plug on the center of the front end surface of the billet, and successively piercing the billet by means of the plug while the billet is rolled the tip portion of which is retained in the pass center line by the rolling rolls.
257137
Kawaharada Minoru
Yanagimoto Samon
Yoshiwara Seishiro
LandOfFree
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