The invention discloses a
cutting blade for
processing soft metal materials. The
cutting blade comprises an upper surface, a lower surface, a pair of side faces and a blade body which is enclosed by a
conical surface for connecting the pair of side faces. The blade body is provided with a blade positioning hole, and the upper surface and the lower surface are connected through the pair of side faces and the
conical surface. The
conical surface and the upper surface are intersected into a main
cutting edge, and the two side faces and the upper surface are intersected into two side cutting edges which are respectively connected on two sides of the main cutting edge. The upper surface is sunk toward the lower surface to form a rake face, a concave curved surface for guiding chips and more than two
chip breakers in a shape of an elliptical lug boss. The
chip breakers are uniformly distributed in a
height increasing stepped shape from a position close to the main cutting edge to the blade positioning hole. The concave curved surface is connected between two adjacent
chip breakers; and the rake face extends toward the middle of the upper surface from the main cutting edge and two side cutting edges, and is connected with the concave curved surface. The cutting blade has the advantages of controlling shapes and flow directions of the chips, decreasing the contact between the chips and the upper surface of the blade, and reducing the cutting temperature.