Surface coated cutting tool with excellent chipping resistance
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United States of America Patent
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Jun 24, 2014
Grant Date -
Oct 25, 2012
app pub date -
Nov 1, 2010
filing date -
Oct 30, 2009
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Abstract
Provided is a surface coated cutting tool in which a hard coating layer exhibits excellent chipping resistance in high-speed intermittent cutting processes. In the surface coated cutting tool having the hard coating layer including a lower layer (Ti compound layer) and an upper layer (Al2O3 layer) formed by vapor-deposition on the surface of the cutting tool body constituted by a WC-based cemented carbide or TiCN-based cermet, the ratio b/a of the number a of crystal grains in the Ti compound layer present in the interface to which the lower layer and the upper layer are adjacent to the number b of crystal grains in the Al2O3 layer is 4≦b/a≦20, and, furthermore, the average grain diameter of crystal grains in the Ti compound layer immediately below the Al2O3 layer is 0.5 μm or less.
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