Patent ID: 8007929

Claim:
A surface coated cutting tool having, on a surface of a substrate, a hard coating layer including at least an aluminium oxide layer, the surface having a rake face on a main face thereof and a flank on a side face thereof, wherein, when a value calculated by the following equation (I) is a texture coefficient TC of an (HKL) plane of the aluminium oxide layer, a ratio of a texture coefficient TC R on the rake face to a texture coefficient TC F on the flank, TC F /TC R , is in a range of 0.3 to 0.95 TC = I ⁡ ( HKL ) / I O ⁡ ( HKL ) 1 / 6 ⁢ ⁢ ∑ [ I ⁡ ( hkl ) / I 0 ⁡ ( hkl ) ] ( I ) where, (HKL) plane is one selected from (012), (104), (110), (113), (024), and (116) planes; I(HKL) is a measured value of an X-ray diffraction peak on the (HKL) plane; I 0 (HKL) is a standard X-ray diffraction peak on the (HKL) plane of a JCPDS card number 10-173; and Σ[I(hkl)/I 0 (hkl)] is a sum of values of [Measured value of X-ray diffraction peak]/[Standard X-ray diffraction peak] on the (012), (104), (110), (113), (024), and (116) planes.