Ductile Mode Machining of Hard-Brittle Materials under High Hydrostatic Pressure(1st Report)

New Machining Device for Machining Tests under High Hydrostatic Pressure

Abstract

This paper introduces a new machining device that enables us machining tests of hand-brittle materials under high hydrostatic pressure, up to 400MPa. The new machining device consists of a pressure vessel in which a turntable and a tool stage mechanisms are installed. The device equips several sensors in the chamber. A load cell for cutting force measurement and position sensors of the tool stage were specially designed for use under high hydrostatic pressure. A pressure gage and a thermometer are placed near the cutting tool so that environment of the machining region can be monitored Sensitivity and accuracy of these sensors were tested, and it was shown that the sensors are available for machining test wider high hydrostatic pressure. A plate glass was use as a specimen for machining test wader high hydrostatic pressure. Machining defect and tangential cutting force were measured. Results show that hydrostatic pressure reduces machining defect, but increases cutting force.