| 摘要 |
<p>Displacement members (68,100,110,120,124) for use in forming a bit body o f an earth-boring rotary drill bit include a body having an exterior surface , at least a portion of which is configured to define at least one surface o f the bit body as the bit body is formed around the displacement member. In some embodiments, the body may be hollow and/or porous. Methods for forming eai-th-boring rotary drill, bits include positioning such a displacement mem ber in a mold (62,150) and forming a bit body around the displacement member in the mold. Additional methods include pressing a plurality of particles t o form a body, forming at least one recess in the body, positioning such a d isplacement member in the recess, and sintering the body to form a bit body.</p> |
