DIAMOND-COATED END MILL EXCELLING IN PEELING RESISTANCE AND WEAR RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a diamond-coated end mill exhibiting excellent peeling resistance and wear resistance while relaxing residual stress in a film, and suitable for cutting a hard-to-cut material such as CFRP (carbon fiber reinforced plastics).

SOLUTION: Crystal phase 1 regions with the half-power band width of peaks being 15 cm-1or less, and stress relaxed phase 2 regions with the half-power band width of peaks being 60-90 cm-1when measuring the half-power band width of peaks near 1,333 cm-1by making a Raman spectroscopic analysis of a diamond film surface along the axial direction of the end mill, are alternately formed in the axial direction of the film surface at least. Transition phase 6 regions with the half-power band width of peaks exceeding 15 cm-1and being less than 60 cm-1are formed in the length of 0.1-1.0 mm between the respective crystal phase 1 regions and stress relaxed phase 2 regions. Preferably, in a film cross section perpendicular to the axial direction, cross-sectional regions comprising crystal phases 1 with the half-power band width of peaks being 15 cm-1or less and cross-sectional regions comprising stress relaxed phases 2 with the half-power band width of peaks being 60-90 cm-1are alternately formed in the average film thickness of 0.1-2.0 μm in the film thickness direction of the film.

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