| 摘要 |
PROBLEM TO BE SOLVED: To provide a small diameter drill for processing a printed circuit board for maintaining hole position accuracy and a hole inner wall grade of many processing holes by improving abrasion resistance and welding resistance. SOLUTION: This small diameter drill for processing the printed circuit board has a hard film in at least a part of a base material surface. A tip part of the base material is formed of cemented carbide. The hard film is composed of one or more layers composed of a compound selected from nitride, carbide, and carbonitride of periodic table IVa, Va, VIa group metal. The layers composed of the compound has a layer including chlorine. A blade diameter is set toϕ0.01 mm to 3.0 mm. COPYRIGHT: (C)2005,JPO&NCIPI
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