Method of manufacturing plug used to pierce and roll metal...

Details Method of manufacturing plug used to pierce and roll metal... Method of manufacturing plug used to pierce and roll metal...

2009-07-31

2011-11-29

Tolan, Edward (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

C072S342200, C072S364000

Reexamination Certificate

active

08065900

ABSTRACT:
A plug material having a prescribed shape is prepared, the prepared plug material is thermally treated in a heat treatment atmosphere that contains at least 1.0 vol. % oxygen at a heat treatment temperature of at least 950° C. and less than 1050° C. and thus a plug having an oxide scale layer30on the surface is manufactured. According to the manufacturing method, pores PO that extend along the surface SF of the plug material are formed under outer scale layer20in the oxide scale layer30, which allows cracks to be more easily propagated in the outer scale layer20. Therefore, the outer scale layer20is more easily peeled off than the conventional one.

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English Translation of claims in JP-60-86262, filed May 15, 1985, in name of Sumitomo Metal Industries, Ltd.

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