Cutting blade having a plurality of different coatings on surfaces thereof

A cutting blade having a plurality of different coatings on surfaces of the cutting blade, comprising an upper surface, a lower surface, and a side surface connecting the upper surface and the lower surface;

• wherein the upper surface intersects the side surface to form at least one cutting edge unit;
• the cutting edge unit comprises a main cutting edge and a secondary cutting edge;
• the upper surface comprises at least one set of cutting planes;
• the cutting planes comprise a main cutting surface and a secondary cutting surface;
• the main cutting surface intersects the side surface to form the main cutting edge;
• the secondary cutting surface intersects the side surface to form the secondary cutting edge;
• a main coating is provided on the main cutting surface;
• a secondary coating is provided on the secondary cutting surface;
• and the main coating and the secondary coating are different from each other, wherein the main coating is a TiAlN coating;
• and the secondary coating is an Al2O3 coating.

A cutting blade having a plurality of different coatings on surfaces of the cutting blade, comprising an upper surface, a lower surface, and a side surface connecting the upper surface and the lower surface;

• wherein the upper surface intersects the side surface to form at least one cutting edge unit;
• the cutting edge unit comprises a main cutting edge and a secondary cutting edge;
• the upper surface comprises at least one set of cutting planes;
• the cutting planes comprise a main cutting surface and a secondary cutting surface;
• the main cutting surface intersects the side surface to form the main cutting edge;
• the secondary cutting surface intersects the side surface to form the secondary cutting edge;
• a main coating is provided on the main cutting surface;
• a secondary coating is provided on the secondary cutting surface;
• and the main coating and the secondary coating are different from each other, wherein the upper surface comprises two sets of the cutting planes;
• the main cutting surface in each set of the cutting planes has the main coating;
• the secondary cutting surface in each set of the cutting planes has the secondary coating;
• one cutting edge unit is provided between the main cutting surface and the secondary cutting surface in each set of the cutting planes;
• in both sets of the cutting planes, one cutting edge unit is provided between the main cutting surface in one set of the cutting planes and the secondary cutting surface in the other set of the cutting planes;
• wherein the four cutting edge units are formed in total, the main cutting edge is a continuous cutting edge, and the secondary cutting edge is an intermittent cutting edge.