Designing method about parameters of impregnated diamond bit

A new method on rock drillability based on value A and B, and the method for determining A and B of rock are put forward in this paper. The value A is a data when rock grinds diamonds of bit in drilling, and the value B is a data when rock grinds matrix of bit in drilling. Value A is measured through cutting by diamond saws, and value B is related to the cementation, granularity, and component of mineral in rock. Evaluating the performance of bit can be expressed by the speed of diamond metabolism (u). The u of bit is related to value A, B, the load on bit (p) and the line rate of bit (v), that is u=A~wB~xp~yυ~z. The procedure for designing bit is to make sure the speed of diamond metabolism according to A, B, p and v. Those data are given about designing parameter of bit by the speed of diamond metabolism. The results show that the new method of rock drillability is good in reason, and it can be expressed the rock drillability in quantity. The u is ensured by A, B, p and v. And the parameters of bit are chosen by u. The drilling efficiency can be increased if u is enhanced, and the life of bit can be prolonged if u is reduced.