| 摘要 |
FIELD: rock cutting equipment, particularly drilling bits for well drilling along with well purging with air and water-air mixtures. ^ SUBSTANCE: drilling bit comprises diamond-containing matrix, body with cavity filled with substance having thermal resistance lesser than that of diamonds, matrix and body material. The cavity is made as a number of vertical blind channels filled with fusible metal so that gaps equal to maximal thermal linear metal extension is created. The channels are separated from matrix with sealing plugs. ^ EFFECT: reduced drilling bit wear due to increased intensity of working drilling bit surface during well drilling. ^ 4 cl, 2 dwg |
