FIELD: mining.
SUBSTANCE: invention refers to drilling bit for percussion hard rock drilling. The drilling bit contains a case and a head part determining lengthwise central axis. The head part consists of a front surface having exterior part of the surface and interior part of the surface located radially inwards from the exterior part of the surface. The interior part of the surface is partially sunk by means of a groove relative to the exterior part of the surface. Multitude of channels for fluid medium passes through the head part and conjugates with the groove for supply of washing medium to the groove. The interior part of the surface contains an upraised part carrying multitude of insertions. Imaginary circumference crosses centers of channels for fluid medium and also crosses even number of insertions.
EFFECT: extended operation life and efficient rock removal.
9 cl, 4 dwg
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