ROTARY DRILLING CUTTER Russian patent published in 2005 - IPC

FIELD: rock cutting equipment, particularly cutters for drilling blast-holes, preferably used for anchoring means, in rock having rock-hardness ratio of 6-8.

SUBSTANCE: cutter has 26-28 mm diameter. Cutter comprises body with shank, two wings with hard alloy plate secured in each wing body. Plate comprises main cutting edge having ridge and is arranged in wing body groove. The groove is formed as a pocket. One pocket side facing outer wing surface, which touches well surface, has dimension equal to doubled dimension of that of another side facing inner wing surface. The plate is installed in the pocket so that negative cutting angle of not more than 29° is created. Outer wing body surface from cutting edge facing side opposite to cutter rotation direction has radius not exceeding cutter diameter along ascending screw generator.

EFFECT: increased reliability of plate connection, increased service life of the cutter, reduced drilling resistance.

4 dwg