Multi-layer hard file for indexable insert

A multi-layer film for a indexable insert, comprising:

• a base layer deposited on a cemented carbide steel by physical vapor deposition in order to improve attachment force and align crystals of a surface 200,
• a multi-layer film of (Ti,Al)N, which is an intermediate layer, sequentially deposited to improve shock resistance and chipping resistance, and
• a top layer formed by alternately stacking an A-layer, a B-layer, a C-layer, and a D-layer, [composition equation 1]:
• the film composition ratio of the A,C-layers [Ti(1−x)Alx][C(1−y)Ny], 0.3≦x≦0.5, 0.5≦y≦1, [composition equation 2]:
• the film composition ratio of the B-layer [Ti(1−q)Alq][C(1−r)Nr], 0.6≦q≦0.8, 0.5≦r≦1, and [composition equation 3]:
• the film composition ratio of the D-layer [Al(1−(a+b))TiaMb]N;
• M[Si,Cr] 0.3≦b≦0.08,
• wherein the film composition of the base layer is implemented by the composition equation 1, the film structure of the intermediate layer is a multi-layer film formed by depositing A-layer/B-layer/C-layer having the composition equations 1 and 2, and the film structure of the top layer is formed by alternately stacking the A-layer, the B-layer, the C-layer, and the D-layer, which are implemented the composition equations 1, 2, and 3 and have different composition ratios, in the order of A/B/C/D layers or A/D/C/B layers.