Cemented Carbide Cutting Tool Comprising

A cemented carbide cutting tool made of a tungsten carbide-based alloy comprising:

A dispersing phase comprising tungsten carbide having an average particle diameter of 1 μm or less,a binding phase comprising Co and Cr,and ultra-fine particles comprising a Co alloy having a particle diameter of 100 nm or less,wherein the dispersing phase is 72 to 90 percent by area of a cross section of the cemented carbide cutting tool; the ultra-fine particles are dispersed inside the tungsten carbide; and the cemented carbide cutting tool contains 8 to 13 percent by weight of Co, 0.1 to 3 percent by weight of Cr, the balance being tungsten carbide and incidental impurities.

And more specifically, relates to a cemented carbide cutting tool having a sharp cutting edge and maintaining high cutting characteristics for long service life when used as an end mill having an intermittent cutting mode and when cutting is performed under heavy cutting conditions such as at high feed rate and high cutting depth.


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