摘要:
A bit exchangeable drill includes a detachable cutting head (2) at the tip of a drill body (1), and the cutting head (2) includes a cutting edge (4) extending linearly from a rotation center to a radial outer end in axial end view, and a helical flute (5). At a rake face (9) continuous with the cutting edge (4), a thinning face (10) inclined relative to the rotation axis (CL) and rendering an axial rake angle of the cutting edge negative is formed entirely from a radial inner end to a radial outer end of the cutting edge.
摘要:
According to one embodiment, a drilling machine includes a drilling structure and a travelling machine. The drilling structure drills an object to be drilled composed of at least one structural object on a platy part. The travelling machine positions the drilling structure in a travelling direction of the travelling machine by travelling in a longitudinal direction of the at least one structural object using the at least one structural object as a guide.