Holes machined with diamond (MBD) or cubic nitride (CBN) reamer have small dimensional dispersion, high geometric accuracy (up to 0.002 mm), and small surface roughness parameters (Rα 0.4 to 0.2). Long tool life (average 10,000 pieces per knife) and high productivity. At present, it has been widely used in the final processing of various precision holes in the main valve hole, machinery and instrumentation of hydraulic components, but
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