FINISHING END MILL

• Main Authors: TAKAHASHI NAOSUKE, ARAKI KIBO, OISHI MASANORI
• Format: Patent
• Language: English
• Published: 02.10.2014
• Subjects: MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; MILLING; PERFORMING OPERATIONS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a finishing end mill capable of effectively restraining generation of a cutter mark, by improving processing surface roughness more than conventional processing surface.SOLUTION: The finishing end mill comprises a blade part 4 having an outer peripheral blade 11 formed by projecting outside in the radial direction from a core thickness circumferential surface 6 and a bottom blade 16 formed on a tip surface, and the bottom blade 16 comprises a bottom blade flank 14 for forming a bottom second primary cutting edge 12 and a bottom second secondary cutting edge 13 inward in the radial direction from the adjacent side of the outer peripheral edge 11, and assuming a concave angle of the bottom second primary cutting edge 12 as α and a concave angle of the bottom second secondary cutting edge 13 as , the angles are set so as to become α< , and at least one of a corner edge 7 of a boundary part with the outer peripheral blade of the bottom second primary cutting edge 12 and a radius edge 8 of a boundary part between a rake face 19 of the bottom blade second flank 14 and the bottom second primary cutting edge 12, is formed as a round surface R on a circular arc having predetermined curvature.