END MILL, METHOD OF MANUFACTURING END MILL, AND METHOD OF REPOLISHING END MILL

摘要

PROBLEM TO BE SOLVED: To provide an end mill having high rigidity and capable of being recycled an increased number of times by making polishing in the vicinity of its tip easy and labor saving, as well as a manufacturing method and a repolishing method therefor.SOLUTION: Provided are an end mill (100) having a gash groove (30), a cutting edge (33), and a flank (32) provided at in a tip vicinal part (10) of a rod-like member (90) of a shank diameter φ, as well as a manufacturing method and a repolishing method therefor. The gash groove (30) forms a groove in a bottom blade (31), and is continuously ground so as to be inclined in a direction to reach an outer peripheral surface (92) over a groove length H, with a torsion angle θ toward a base end (2) from the tip (1) of the rod-like member (90). The groove length H is 1.6 times or less of the shank diameter φ, and the gash groove (30) also serves as a chip discharge groove in an outer peripheral blade.SELECTED DRAWING: Figure 2