DIAMOND REAMER Russian patent published in 2000 - IPC

FIELD: metal working, namely processes for finish working of precision openings of articles such as holes of slide valves in housings of hydraulic units. SUBSTANCE: reamer includes body in the form of cylinder with rows of diamond blocks placed onto surface of cylinder. Each row includes several blocks that differ one from another by grain size and length. Grain size and length of each subsequent block in row is less than grain, size and length of previous block by 30-70%. Working surfaces of last blocks of row are cylindrical, working surfaces of all previous blocks are cone with angle of common generatrix equal to 1-10. EFFECT: enhanced efficiency, high quality of working, increased useful life of reamer. 4 dwg