The grain of cutting drill bit, in particular in the masonry work and rock, and the drill bit relates to such a cutting block

摘要

Block for a drill which can be used for drilling of the masonry work and of the stone and the type comprising conventionally a point defined by the intersection of a first and a second surface, and also the front surfaces and of the flank placed on opposite sides of the tip to to define two corners respectively located at the intersection of the front edges of said surfaces, at least one of the front edges, considering the direction of rotation of the drill bit, said ring is chamfered along the intersection of the front surfaces and of the flank 43, 44 of a create of the double intersections 46, 47, 52, 53, adjacent to the part most advanced of the block 1. / p & & p & the time of life and the efficiency of the block of the section are improved.