wear stage and replacement principles of diamond drill bits, христов li qiang foreign geological exploration technology 1991 no. 05 online read articles download. abstract in a mining area, a mining area is used to drill into a complicated and hard and crushed formation. since the launch of the december 1974, the two production drilling has been completed, and 328 devices are started. fund 772. diamond consumption is significantly reduced, in which the equipment of the geological bureau of hubei province is most significant. in 1977, the average of the drill bit life of the province was analyzed for the wear of hundreds of drills on the hubei three teams. it is not normal to wear and deformation. reason.
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