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The drill bit is formed by a steel body
(1) and a working layer
(2) wherein the working layer
(3) comprises the chemical vapor phase deposition diamond film
(4) and hard matrix material
(5) The diamond film
(6) is distributed in the working layer
(7) according to the required form. Molding ways of the drill bit comprise one-step forming and mosaic block type two-step forming. The one-step forming relates to the sintering type hot-press diamond drill bit, and the mosaic block type two-step forming relates to the drill bit formed by firstly sintering impregnated diamond segments and then welding the sintering impregnated diamond segments on the milled steel body. The drill bit can enhance abrasive resistance, reduces cutting adhesion, ensures the roughness and effective exposure of the bottom surface of the drill bit, and has effective gauge protection, thus improving the cutting efficiency and prolonging the service life of the tool. Compared with the common diamond drill bit, the drill bit impregnated with the diamond film has the characteristics of long service life, high drilling efficiency, long working distance, low energy consumption, strong anti-sticking rock dust capacity, etc.
