Abstract
In recent years, many ceramics have been to developed for the uses. Some ceramics for mechanical or electronic parts are required to be cut as the green compact. The cutting of the green compact is decreased cracks on the machined surface. The purpose of the paper is to clarify the mechanism at cutting of green compact. The cutting mechanism is investigated and discussed from the results of the fracture test by a new type testing machine and of the cutting test by a lathe. In the cutting test, the radius of cutting edge were varied from 0.8mm to 4mm. A fracture model is proposed from AE(Acoustic Emission) signal caused by fracture and SEM image of fracture surface. The main results obtained are as follows; (1) AE signal shows there stages of fracturing the green compact. (2) The fracture energy is from 4 J/m2 to 7 J/m2. (3) A fracture model is available to clarify the cutting mechanism. (4) The tool with large side cutting edge angle is able to cut a work at high efficiency and to elongate the tool life.
