END MILL AND METHOD FOR MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To securely prevent damage to a cutting edge to which especially a large cutting load is applied in an end mill having a part with different intervals in the circumferential direction of the cutting edges. SOLUTION: Cutting edges 5 are formed at side ridges at the outer circumferential side of a wall surface directed to the end mill rotating direction T of a plurality of chip discharge grooves 4 formed at the outer circumference of the tip of the end mill body 1 to be rotated around an axis O. Outer circumferential flanks 7 are formed on the rear side in the end mill rotating direction T of the cutting edges 5 to intersect the chip discharge grooves 4 of the cutting edges 5 adjacent to the rear side in the end mill rotating direction T of the cutting edges 5. At least one cutting edge 5A of the cutting edges 5 allows an interval a+B in a circumferential direction with the cutting edge 5B adjacent to the end mill rotating direction T side to be larger than the other cutting edges 5B and allows the width (A) in the circumferential direction of the outer circumferential flank 7A continuous with at least one cutting edge 5A to be larger than the other cutting edges 5B in at least a part along the direction of the axial line O. COPYRIGHT: (C)2010,JPO&INPIT