Excellent surface coating drill in wear resistance and chip discharge performance .

摘要

PROBLEM TO BE SOLVED: To provide a surface-coated drill, in which a hard coating layer demonstrates excellent wear resistance and chip discharging property even in machining conditions of high-feed and dry deep-hole drilling.;SOLUTION: In the surface-coated drill, a layer as an orientation control layer consisting of a composition of Ti_1-aAl_aN{a=0-0.5} exists on the top surface of a drill base body directly or via an intermediate layer. In the area up to a length five times of the drill diameter D from the tip of the drill along the longitudinal direction of the drill body in a flute groove of the drill, when an orientation coefficient is set as TC_hkl(x), the value of TC₁₁₁(x) is gradually decreased in a range of 3TC₁₁₁(x)0.5 at the distance of x times of the drill diameter D from the tip of the drill. Furthermore, TC₂₀₀ is 1.5 times or more of TC₁₁₁ at the lowest place of the TC₁₁₁.;COPYRIGHT: (C)2012,JPO&INPIT