DRILLING THERMAL FRICTION BIT Russian patent published in 2011 - IPC E21B10/48 E21B7/14 

FIELD: mining.

SUBSTANCE: drilling bit for thermal friction drilling of mine rocks includes housing with waterways, friction elements softening by means of friction heat the surface layer of rock, and cutters protruding behind the plane of friction elements. Front edge of friction elements is covered with cutters, thus preventing the wetting of bottom-hole with flushing fluid before friction element; at that, cutters are made from heat-resistant hard or super hard tool material.

EFFECT: reduction of friction heat loss of cutting and friction elements, reduction of axial force at which heating of rocks of bottom-hole occurs prior to softening.

3 cl, 3 dwg