Metal deforming – By use of roller or roller-like tool-element – With tool inside hollow work
Reexamination Certificate
2007-01-23
2007-01-23
Suhol, Dmitry (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
With tool inside hollow work
C072S466200
Reexamination Certificate
active
11291869
ABSTRACT:
By employing a Cr-plated mandrel bar for producing hot seamless tubes according to the present invention wherein centerline average roughness Ra in axial and circumferential directions as well as maximum depth Rv in axial and circumferential directions is specified and further maximum height Rp in axial and circumferential is specified, surface defects such as seizure unlikely generate in an elongation-rolling process by a mandrel mill so that the service life can be dramatically extended, thereby the remarkable reduction of tool cost can be achieved. Moreover, it contributes greatly to improve the inner surface quality of hot seamless tubes to be rolled by a mandrel mill rolling process. Also, the manufacturing method by the present invention makes it possible to efficiently manufacture Cr-plated mandrel bar for producing hot seamless tubes.
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Anraku Toshiro
Hori Hirofumi
Iida Sumio
Imamura Masami
Clark & Brody
Suhol Dmitry
Sumitomo Metal Industries Ltd.
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