Abstract
This paper proposes machining method under high hydrostatic pressure as a new damage-free machining method for hard brittle materials. For machining tests under-high hydrostatic pressure, a new machining device was developed. The device consists of a turntable and a tool stage inside a pressure vessel, and they are controlled by motors and a handle installed outside of the vessel. The device also consists of a load cells to measure cutting forces, and position sensors to detect tool position. Machinability of glass was examined by the device under 400MPa and 0MPa. Optical observation of the machined traces has revealed that hydrostatic pressure is efficient to minimize machining defect.
