DIAMOND THIN-WALL BIT Russian patent published in 2011 - IPC B23B51/04 B28D1/14 

FIELD: process engineering.

SUBSTANCE: proposed bit comprises tubular body with annular grooves made on bit inner and outer surface to form body thinner section, and working section made up of galvanic diamond-containing layers applied on said body. Body thinner section wall thickness is selected proceeding from b₁=(2.5÷4.0) (a₁+a₂), where b₁ is thinner section wall thickness; a₁ and a₂, are galvanic diamond-containing layer thickness of outer and inner surfaces, respectively, while wall thickness b of body section without groves is selected from condition b=(1.2-3.0)b₁. Note here that diamond-containing layer thickness in axial direction exceeds groove length.

EFFECT: higher hardness and longer life.

2 cl, 1 dwg