END MILL AND SCROLL FOR SCROLL COMPRESSOR

摘要

In an end mill, a peripheral cutting edge portion has a peripheral cutting edge formed in a spiral shape around an axis, a peripheral rake face formed on the front side of the peripheral cutting edge in the rotating direction and bordering thereon and a peripheral flank formed on the rear side of the peripheral cutting edge in the rotating direction and bordering thereon. The peripheral flank has a first peripheral flank formed in a position on the mill body tip side to have a first clearance angle and a second peripheral flank formed in a position on the mill body end side of the first peripheral flank and neighboring the first peripheral flank to have a second clearance angle. An average width value of the first peripheral flank in the rotating direction is greater than an average width value of the second peripheral flank in the rotating direction.

主权项

1. An end mill comprising:
a mill body to be rotated in a rotating direction around an axis; and a plurality of peripheral cutting edge portions twisted around the axis and formed on a circumference of a tip side of the mill body, the plurality of peripheral cutting edge portions each comprising a peripheral cutting edge formed into a spiral shape around the axis, a peripheral rake face on a front of the peripheral cutting edge in the rotating direction and bordering on the peripheral cutting edge, and a peripheral flank formed on a rear side of the peripheral cutting edge in the rotating direction and bordering on the peripheral cutting edge, the peripheral flank comprising a first peripheral flank extended from the tip side of the mill body to an end side of the mill body, and a second peripheral flank formed in an area of a rear side on the first peripheral flank in the rotating direction and formed in a position of a rotation phase being common to each of the peripheral cutting edge portions.