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The drilling rate can be expressed in terms of the frequency of contact of the bit tooth with the rock and the volume of rock fragmented by each blow it follows, therefore, that r fbvba 25 eng., 25 1968 293-314 rock breakage by crushing, blasting, and drilling 305 where fb blow frequency vb volume removed per blow.
We are an innovative enterprise integrating R & D, production, sales and after-sales service. We have more than 60 years of experience in the field of crushing, beneficiation, sand making and building materials. We serve customers in more than 160 countries around the world.