Machining, Measurement, and Control Laboratory

A Study on End Milling of Hardened Steel for Dies and Molds
- Tool Life Estimation and Its application for Trochoid Tool Path End Milling -

Yukitoshi Otsuka (Oita Industrial Research Institute)
Iwao Yamaji (Kyoto University)
Heisaburo Nakagawa (University of Shiga Prefecture)
Yoshiaki Kakino (Kyoto University)

This study deals with tool life estimation in end milling hardened steel considering the influence of concave contour cutting which appears especially in die/mold making, and its application for fixed cycles by end milling. Wear experiments revealed that the tool life became shorter with increasing cutting engagement angle even if initial cutting forces were controlled constant. Then a tool life estimation method with regarding of a total cut length was proposed and this method was applied for trochoid tool path end milling. It was shown that the obtained method was quite effective.