FIELD: rotary drilling, particularly to make roof bolting holes in rock having 6-8 rock-hardness ratio.
SUBSTANCE: cutter comprises body with stem, two wings with hard-alloy plates fixed in wing grooves and central liquid supply channel. The plates have cutting edges oriented in cutter rotation direction. Hard-alloy plates are fastened to wing bodies by means of cylindrical fixers passing through hard-alloy plates so that fixer axes are transversal to plates. Cylindrical sharpened pins made of hard-alloy material are inserted in the orifice and abut upon fixer end. The pins are oriented in direction opposite to cutter rotation. Central liquid supply channel is connected to liquid transfer grooves through channels diverging from the central liquid-supply channel. The liquid transfer grooves are formed in surface of hard-alloy plate contact with wing body.
EFFECT: increased reliability of hard-alloy plate fixation and extended service life of cutter.
5 dwg
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SU1305296A1 |
