Yang Zhan1, Tang Fengling2
(1. Faculty of Mechanical and Electronic Engineering, China University of Geosciences, 430074
2. Faculty of Engineering, China University of Geosciences, 430074)
Abstract In order to solve the problem of low efficiency and short service life of hot pressed diamond bit in drilling hard and compact formation, internal relations between diamond exposure of hot pressed bit and rock abrasiveness were analyzed in this paper. Research on matrix performances of hot pressed diamond bit was firstly carried out. Through some experiments and theoretical analyses, steel-bonded carbide impregnated diamond bit was trial-manufactured by hot pressing method and great progress was made to overcome the difficulties of drilling hard and compact formation. Field examinations of steel-bonded carbide bits in drilling hard and compact formation indicated the penetration rate had increased to 1.18m/h from 0.5m/h and the service life had increased to 21.31m from 10m in average compared to WC-based diamond bit. The result showed steel-bonded carbide is a kind of matrix material with excellent properties and the hot-pressed steel-bonded carbide diamond bit has good performances for drilling hard and compact formation.
Keywords steel-bonded carbide; hot-pressed; diamond bit