DRILLING BIT Russian patent published in 2020 - IPC E21B10/36 E21B10/54 C21B7/12 

FIELD: soil or rock drilling.

SUBSTANCE: invention relates to a drill bit for drilling, in particular percussion-rotary drilling, a hole, in particular a tap-hole of a melting furnace. Drill bit comprises drill head with at least one insert of solid material and housing for connection with drive element. Insert of solid material is inserted into formed in axial end surface of drilling head socket so that at least one upper cutting edge of insert from solid material protrudes beyond axial end surface. Seat comprises section of side wall and opposite said section of side wall – section of opposite side wall, between which insert is made of solid material. Sidewall section opposite the recess formed in solid material insert is provided with web, which is at least partially formed from welding material, by means of welding material, is permanently connected to closing by material and is connected to drilling head and enters said cavity for formation of connection with geometrical closure with insert from hard material.

EFFECT: technical result consists in providing heat-resistant mechanical connection inserts of solid material and drilling head drilling bit.

16 cl, 10 dwg