Cutting heads and rotating cutting tools with a leading edge with a radially extending front cutting edge provided with negative and positive angles of inclination

摘要

The cutting head rotatable about the first axis comprises a middle portion and a tip portion. The middle portion has a plurality of leading edges defining a cutting diameter, and the leading portion has a plurality of front surfaces with outer and inner cutting edges and an axially foremost leading point. The outer beveled surface adjacent each outer cutting edge has a positive outer bevel angle, and the inner beveled surface adjacent each inner cutting edge has a negative inner bevel angle. Each outer sloping surface is arranged on a head flute intersecting one of the leading edges and each inner sloping surface is arranged on a gash intersecting one of the head flutes. Each gash extends to a gash path end point located at a first distance axially rearward of the leading point, the first distance being greater than 30% of the cutting diameter.