A cutting tool (2)in particular a rotary toolis described, having a cutting edge (4) from which a rake face (6) and a clearance face (8) extend, characterized in that a groove (12) is introduced into the clearance face (8) in a region along the cutting edge (4) so that a part of the clearance face (8) is formed as a wear face (14) that extends between the groove (12) and the cutting edge (4) and is bounded by the groove (12) and the cutting edge (4). The groove (12) advantageously limits the wear of the cutting tool (2) in the region of the cutting edge (4) on the wear surface (14), so that overall the frictional forces that occur are kept small and the service life of the cutting tool (2) is extended. Furthermore, a cutting element for a cutting tool (2) as well as a method for manufacturing the cutting tool (2) are described.

The drill of the invention has: two cutting edges, each having a main cutting edge and a thinned cutting edge, wherein two relief surfaces formed symmetrically around rotation axis, first and second margin portions are formed, the first margin portions have a forward-end small-diameter portion with diameter smaller than the drill diameter, that is formed from the side of the drill forward-end toward the drill rearward-end, the second margin portions have a second forward-end small-diameter portion with diameter smaller than the first forward-end small-diameter portion, that is formed from the side of the drill forward-end toward the side of the drill rearward-end, the first forward-end small-diameter portion and the second forward-end small-diameter portion have inclination portions, the diameters of which gradually increase from the side of the drill forward-end toward the side of the drill rearward-end, and the inclination portions of the first forward-end small-diameter portion have relief surfaces.

Provide are a spade drill blade and a combined blade. The spade drill blade includes cutting surfaces, cutting grooves, rear cutting surfaces, secondary cutting surfaces, cutting edges, secondary edges, a chisel edge, and side edges. One or more micro strengthened stepping tables are integrally erected on the cutting surface and each intersect with the rear cutting surface to form a micro strengthened side cutting edge; and a protruding stepped cutting surface is integrally formed on an inner side of each micro strengthened stepping table and intersects with the rear cutting surface to form a stepped cutting edge. On a cutting surface of the combined blade, one or more micro strengthened stepping tables are integrally erected in an axial direction of a rotation center of the combined blade and each intersect with the rear cutting surface to form a micro strengthened side cutting edge.