| 摘要 |
<p>DIAMOND IMPREGNATED BIT WITH AGGRESSIVE FACE PROFILE A drill bit (200) comprises a shank (220), a crown (21) defining a central axis (C) and having at least one fixed segment (235), each segment (235) being spaced from the central axis (C) of the crown (21) and comprising a cutting face (230) having a proximal portion and a distal portion, the proximal portion being secured to the shank (220), the 10 distal portion forming a distal surface; and a plurality of surface features (250) continuous with and extending distally away from the distal surface of the cutting face (230) of each segment (235). The plurality of surface features (250) and at least the distal portion of the cutting face (230) of each segment (235) are integrally formed of a selected matrix material (260), wherein each surface feature (250) of the drill bit (200) consists solely of 15 the selected matrix material (260), and wherein the matrix of the selected matrix material (260) is configured to erode to expose the abrasive particles (270) within the matrix. 240 , 250--' I I it4</p> |
