| 摘要 |
A cutting member for rotary drill bits for deep-well drilling in ground formations consists of a carrier member (1) with a supporting surface (3) and a supporting member (4) of hard metal rigidly connected to this at its back and with a cutting layer (5) of polycrystalline synthetic diamond material. The supporting member (4) together with its cutting layer (5) is cut out of a circular cylindrical shaped body or made as a segment and together with its cutting layer occupies only a portion of the supporting surface (3) of the carrier member (1), the remaining supporting surface being occupied by a supplementary member (6) of hard metal or other high-strength substances. With regard to the cutting performance and effect, the same requirements are met as with a circular diamond cutting plate while at the same time considerable savings are achieved in valuable diamond material. |
