ANTI-VIBRATION RING DRILL CROWN Russian patent published in 2017 - IPC E21B10/48 E21B10/60 

FIELD: mining.

SUBSTANCE: anti-vibration drill crown comprises a housing with connecting thread, divided with main flushing ports in the sectors that on the end surface are provided with polycrystalline diamond inserts (PCD), having a negative rake angles in plan to the lateral inner and outer cutting surfaces and a negative rake angles to the downhole end surface, main flushing ports are oppositely angled, moreover, additional flushing ports formed along the entire height of the crown body in a helical line rightwards along the crown rotation are located counter-currently angle wise in the crown case in sectors. The height of the crown body depends on the helix lead of main and additional flushing ports, inside the additional flushing ports there are two or more calibrating PCD each of which represents a separate helix element and is fixed on the housing by soldering at a negative angle of minus 5° to minus 15° relative to the cutting surface. PCD at the crown end are arranged in different directions at an angle of 10° up to 15° to the direction of cutting.

EFFECT: reduced number of chips and damages of the polycrystalline diamond inserts on the crown body, increased drilling rate and reduced vibration.

7 dwg