The design method for a non-homogeneous diamond bit matrix is given ac
cording to the rule that the matrix must be suited to the rock formati
on to be drilled. The non-homogeneous matrix can extend the bit to sui
t the objects to be drilled and self-adjust the exposure of the diamon
d in the bit during the drilling process. (C) 1998 Elsevier Science S.
A. All rights reserved.