TWO PIECE MOLD USED IN MANUFACTURE OF PDC DRILL BITS AND METHOD OF USING SAME

摘要

A graphite core mold having its own cavity is pressed into a cavity of a graphite shell mold. The core cavity is filled with tungsten carbide, mixed with a nickel alloy, heated and then cooled to thereby provide a carbide matrix body. After milling the carbide matrix body to thereby provide a carbide bit body, the intact shell mold is removed and then used again.