US Patent 7179022 Cutting tool coated with diamond

Patent 7179022 was granted and assigned to NGK SPARK PLUG CO on February, 2007 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

NGK SPARK PLUG CO

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

71790220

Patent Inventor Names

Takashi Okamura0

Satoshi Iio0

Date of Patent

February 20, 2007

Patent Application Number

102421410

Date Filed

September 12, 2002

Patent Primary Examiner

‌

Dana Ross

Patent abstract

A cutting tool coated with diamond in which diamond is coated as a film on a substrate having a step 15 to 500 μm in height in the vicinity of a cutting edge on the rake surface and/or the flank surface. Only the diamond film in the vicinity of the cutting edge can be polished first, without polishing the film of the diamond formed centrally of the rake surface and/or the flank surface. This enables the maximum effect (sharpening of the cutting edge and prevention of welding formation at cutting edge) to be realized with the necessary minimum polishing (with a decreased polishing removal), without setting special conditions and which is suited as a finishing tool.