| 摘要 |
<p>A drill bit for well or deep drilling comprises a steel connection member (1) with a threaded plug (2), for connecting to a drilling string or other rotary drive, and a head (3). Cutting members (11) are mounted on strip- shaped vanes (10) which are inserted in recesses in the head (3) and welded or soldered thereto (as at 12). The vanes (10) comprise a lower portion (13) of steel to which a base member (18) of a matrix-binding agent composition is sintered. The cutting members (11) are mounted on the base member (18). Since the vanes (10) and the connection member (1) are made separately, the connection member (1) is not subjected to a high temperature sintering process and may be made in one piece of a high quality steel. <IMAGE></p> |
