| 摘要 |
An elongate drill component (20; 120) for percussive drilling comprising a female threaded end (21) having an outer diameter (Dot), a male threaded end (22), a central section (27) between said ends having an outer diameter (Doc) and wherein the outer diameter of the female threaded end is larger than the outer diameter of the central section. A through-going flushing channel comprising a central flushing channel (28;128) having a diameter (Dic) and thread flushing channels (29;129) having a diameter (Dit). The ratio of an elastic section modulus of a threaded joint (31) measured when the female threaded end is connected to the male threaded end of an identical component to an elastic section modulus of the central section (27), St/Sc, is more than 1.5 and in that a ratio of the diameter of the central flushing channel to the outer diameter of the central section, Dic/ Doc is between 0.45 and 0.95. |
