| 摘要 |
PROBLEM TO BE SOLVED: To carry out stable cutting work with a roughing end mill provided with a plurality number of torsional grooves on a tool main body and provided with an outer peripheral cutting edge a crest part and a trough part of which are made into a continuous wave form on an outer periphery of the tool main body on the rear side in the rotating direction from each of the torsional grooves. SOLUTION: A radius of curvature R1 on the tool head end side on the crest part of the outer peripheral cutting edge is made smaller than a radius of curvature R2 on the tool rear end side in the case when the outer peripheral cutting edge has a right edge torsional to the right, and the radius of curvature R1 on the tool head end side on the crest part of the outer peripheral cutting edge is made larger than the radius of curvature R2 on the too rear end side in the case when the outer peripheral cutting edge has the right edge torsional to the left on the roughing end mill provided with a plurality number of the torsional grooves 11 on the tool main body 10 and provided with the outer peripheral cutting edge 12 the crest part 12a and the trough part 12b of which are made into a continuous wave form on the outer periphery of the tool main body on the rear side in the rotating direction from each of the torsional grooves as well as provided with a plurality number of the torsional grooves on the tool main body. |
