MODULAR DRILL Russian patent published in 2015 - IPC B23B51/02 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for boring. This drill comprises rod part with end side spinning about rotational axis and cutting part to spin about some axis or said rotational axis and coupled or made to be coupled with said rod part at its end side. Said rod part comprises at least one torque transfer element. The latter extends at end side and has at least one torque transfer surface to transfer torque from rod part to cutting part. Said transfer surface has at least one said area to intake said torque. Besides, it has at least one centring element for radial centring of said surface relative to rod part and is secured thereto by securing element.

EFFECT: better torque transfer, higher efficiency of drilling.

19 cl, 11 dwg