Method of producing seamless metal tube and punch for use...

Details Method of producing seamless metal tube and punch for use... Method of producing seamless metal tube and punch for use...

2010-03-29

2011-10-18

Ekiert, Teresa (Department: 3725)

Metal deforming

Process

Tube making or reshaping

C072S096000

Reexamination Certificate

active

08037732

ABSTRACT:
A hole30is formed in the center of the rear end face20of a round billet10. The hole30has a predetermined depth from the rear end face20and a plurality of grooves31are provided in the side surface thereof. Each groove31extends in the depth direction of the hole30. Piercing and rolling of the round billet10having the hole30is performed using a piercing mill having a plug. During piercing and rolling, the bottom surface of the hole30is broken through by the plug and a protrusion which is to be the starting point of burrs is formed, and the protrusion is absorbed by the groove31as the plug advances. Consequently, formation of burrs at the rear end of a hollow shell after piercing-rolling thereof can be suppressed.

REFERENCES:
patent: 1465073 (1923-08-01), Davis
patent: 4190887 (1980-02-01), Yoshiwara et al.
patent: 59-148102 (1984-10-01), None
patent: 62-199201 (1987-12-01), None
patent: 7-214112 (1995-08-01), None
patent: 7-214113 (1995-08-01), None
patent: 2001-219205 (2001-08-01), None

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