Abstract
In recent years, many glass ceramics with various kinds of properties have appeared on the market. These ceramics are used for a few mechanical and electronic parts. Glass ceramics consisting of fiuor-phlogopite can be machined with tight tolerance using conventional metalworking equipment and tools. The purpose of this paper is to study the shape of drill edge and to find the mechanism of chipping on drill key hole in cutting with high efficiency. The chipping size was discussed upon both examination in drilling and analysis with the finite element method. The tests of drilling mica-ceramics were performed with twist drill of high speed steel by milling.
The main results obtained are as follow: (1) Cutting of high speed and feed had an important effect on chipping size of drill key hole. (2) The tip angle of 90°on drill resulted in small chipping size. (3) The worn tool increased chipping on machining surface. (4) A large thrust in drillingincreased chipping of exit side on hole.
