DRILL WITH INDEXABLE CUTTING PLATES AND DRILL BODY Russian patent published in 2013 - IPC B23B51/00 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in machining materials by drill with indexable cutting plates. Proposed drill comprises cutting plate seat formed at drill body end in direction of rotational axis and chip removal flute extending from drill body front end surface to read end surface in direction to rotational axis. Wall surface making chip removal flute comprises, at least, partially a smoothed surface with surface roughness not exceeding 0.5 mcm in terms of mean arithmetic deviation of profile Ra and includes first wall surface facing drill rotational direction and second wall surface crossing the first one. Cutting plate seat comprises central edge seat receiving cutting plate nearby rotational axis and outer peripheral edge seat receiving cutting plate at distance from rotational axis. Chip removal flute wall surface is composed partially of thinner wall part, thinner central edge and outer peripheral edge seat. Crossing part between first and second wall surfaces is rounded.

EFFECT: uniform removal of chips, higher durability of rill.

5 cl, 6 dwg