SURFACE COATED CUTTING TOOL WITH HARD COATING LAYER EXHIBITING SUPERIOR RESISTANCE AGAINST PEELING AND CHIPPING IN HIGH SPEED CUTTING OF SOFT HARD-TO-CUT MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool with a hard coating layer exhibiting a superior resistance against peeling and chipping in high speed cutting of a soft hard-to-cut material.

SOLUTION: The cutting tool constituted by coating the outermost surface of a tool base body comprising tungsten carbide base cemented carbide or titanium carbide nitride base cermet with a titanium boride layer with an average layer thickness of 0.5 to 5 ηm, the titanium boride layer is constituted as a complex tissue of a crystalline particles tissue having a plurality of average particle sizes, the complex tissue is constituted of secondary crystalline particles having an average particle size of 40 to 70 nm comprising the aggregate of primary crystalline particles having an average particle size of 10 to 15 nm and tertiary crystalline particles having an average particle side of 300 to 600 nm comprising the aggregate of the secondary crystalline particles.

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