Damage-free machining of hard brittle-materials under high hydrostatic pressure

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This project proposes machining under high hydrostatic pressure as a new damage-free machining method for hard-brittle materials. A special apparatus was designed to investigate effect of hydrostatic pressure on machinability of hard-brittle materials. The apparatus is constructed with a pressure vessel, a turntable and a cutting tool system equiped in the vessel, motors that drive the turntable and cutting tool installed outside of the vessel, a high pressure pump, and control systems. The apparatus was designed to stand for hydrostatic pressure of 500 MPa, whose pressure medium is turbine oil. A load cell that measures principal cutting force and tangential force under high hydrostatic pressure was developed so that machining status could be monitored from variation of cutting forces. The apparatus was desinged to conduct precision end-face turning test by using a diamond cutting tool under high hydrostatic pressure environment of 5OOMPa. Several performance evaluation tests were conducted on the apparatus, and it was verified that fundamental performance of the apparatus has satisfactory.