DRILL BODY Russian patent published in 1999 - IPC

FIELD: working of metal materials. SUBSTANCE: body has cylindrical tubular part which has cylindrical cavity at one end and drilling head at the other end. Drilling head is provided with chip space coupled to one or two channels for chips and containing one or several cutting plates made of hard alloy and soldered in seats. Body is of one-piece design. Chip space is shaped as truncated con e. Cone base surface is directed towards operating end of drilling head. Chip space is coupled to the cylindrical cavity at end opposite to chip channels. As a result, hazard of chip jamming is avoided, and internal unevenness in which chips may be accumulated thus causing jamming is removed. EFFECT: higher efficiency. 5 cl, 9 dwg