DRILLING CROWN WITH REPLACEABLE CUTTING SECTION Russian patent published in 2017 - IPC B23B51/04 B28D1/14 E21B10/46 

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used in machining of openings in different materials. Drilling crown includes drill bit rod section with insertion joint first element, cutting section with insertion joint second element, which together with insertion joint first element forms insertion joint with insertion joint external element and insertion joint internal element. Cutting section has several fragments sections, made with part of annular section and, at least, one cutting segment. Each part of annular section forms insertion joint with insertion joint first element and made with possibility of connection to insertion joint first element by means of pin connection, including, at least, one drilled receiving hole and, at least, one pin element. Said, at least, one drilled receiving hole is made with same depth or deeper, than said, at least, one pin element.

EFFECT: enabling drilling crown cutting section fast replacement, reliable connection of sections, reducing manufacturing costs.

16 cl, 4 dwg