| 摘要 |
Provided is an end mill, in which the fracture resistance of each cutting edge is improved to prolong the tool life. Further, by using the end mill, the generation of burrs in a workpiece can be prevented and then the cutting operation can be performed in a good condition. In the end mill, multiple spiral flutes (4) in a helical shape around an axis (O) are formed in a periphery of the top portion of an end mill body (1) which rotate on the axis (O), and cutting edges (5) are formed at peripheral side ridge portions of wall surfaces of the flutes (4) facing to the front side in the end mill rotating direction (T). The honing having a variable width in the direction of the axis (Q) is made along each peripheral cutting edge (5). |
