FIELD: process engineering.
SUBSTANCE: proposed two-fluted diamond-coated drill cross-like-front-edge-sharpened drill bit features rear angle varying from 10 to 20 degrees, front angle of sharpened edge varying from -5 to 10 degrees, transverse edge length smaller than 0.035 mm, and apex angle varying from 70 to 100 degrees.
EFFECT: higher quality of machining.
27 cl, 8 dwg, 2 tbl
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