DIAMOND DRILLING BIT Russian patent published in 2016 - IPC E21B10/54 

FIELD: drilling of soil or rock.

SUBSTANCE: invention relates to drilling equipment and can be used in production of drilling bits with a cutting structure in the form of polycrystalline diamond elements intended for wells construction. Diamond drilling bit includes a body with a connection thread, blades equipped with rock-destructing and protective cutters PDC, separated by an inter-blade space with holes for hard-alloy nozzles and passage of flushing liquid, covered with pad-weld and sputter of hard-face wear-resistant protective coating of high strength. On the surface of the bit body there is a coating in form of a substrate layer made by sputtering, on which there is deposited a wear-resistant protective coating. Hardness of the sputtered substrate layer is less than the hardness of the built-up protective hard-alloy coating, but higher than the hardness of the material of the bit body, while the thickness of the sputtered substrate layer constitutes 0.3÷0.8 mm.

EFFECT: technical result consists in improvement of reliability of bits body, increased strength and performance of bits.

1 cl, 4 dwg