Cutting Performance Evaluation and Estimation of Tool Life by Simple ＆ Multiple Linear Regression Analysis of $Si_3N_4$ Ceramic Cutting Tools.

$Si_3N_4$계 세라믹 절삭공구의 절삭성능평가 및 회귀분석에 의한 공구수명 추정

Four kinds of $Si_3N_4$-based ceramic cutting tools with different sintering time were fabricated to investigante the effect of sintering time on the microstructure, mechanical properties, grain sizes and the cutting performance. An endeavor was also made to determine the relation among mechanical property, Brain size and tool life. $Si_3N_4$ home made cutting tool sintered for 1 hour under $1760^{\circ}$ temperature and 25MPa pressure showed the best cutting performance among selected ceramic tools during machining both Bray cast iron and heat treated SCM440. Multiple linear regression model was used to estimate the tool lift from mechanical property, grain size and showed good result. It was also shown that hardness imposed the biggest offect on tool life.