SURFACE PLANTED TYPE DIAMOND BIT CAPABLE OF ADJUSTING PROJECTION HEIGHT OF DIAMOND ABRASIVE GRAINS FROM MATRIX AND STRONGLY MAINTAINING INNER AND OUTER DIAMETERS

摘要

PROBLEM TO BE SOLVED: To secure a space for circulating cooling water for the purpose of cooling a bore hole and removing scraps by taking a large clearance between a matrix surface for holding the diamond of a surface planted type bit and a rock to be drilled.;SOLUTION: The matrix 20 for holding diamond abrasive grains 10 to be a blade tip is turned to a two-story structure in a height direction, a second floor layer comprises a pedestal sufficiently larger than a diamond particle, and the pedestal of the second floor layer projected from the matrix is constructed. Manufacturing is performed by an impregnation method, and a female die made of graphite is processed and configured. For the second floor layer part, a diamond implanting hole is processed and molded on the graphite die by a drill, an end mill or a ball end mill. At the center of the pedestal of the first stage for mounting the diamond, processing is performed to a depth corresponding to a diamond size further.;COPYRIGHT: (C)2012,JPO&INPIT