Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1990-02-28
1991-07-16
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72209, B21B 2500
Patent
active
050314343
ABSTRACT:
A plug for manufacturing a seamless steel pipe is disclosed. The plug includes the surface layer made of molybdenum or molybdenum base alloy coming in contact with a workpiece to be drilled and the core covered with the surface layer. The surface of the core being in contact with the surface layer is formed uneven. According to the invention, the surface layer and the core are strongly joined together, and the life of the plug is elongated.
REFERENCES:
patent: 1963320 (1934-06-01), Wright
patent: 2392821 (1946-01-01), Kreag
patent: 4466265 (1984-08-01), Wessel
Patent Abstracts of Japan, vol. 12, No. 466, (M-722)(3313), Dec. 7, 1988; and JPA-63-192-504.
DE-C-489,432, (Rheinisch-Westfaelische Stahl-Und Walzwerke AG), 1/1930.
Hirakawa Tomoyuki
Kuwano Takeshi
Mihara Yutaka
Oikawa Tsuneo
Takase Akira
Larson Lowell A.
NKK Corporation
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