Milling Forces of Compacted Graphite Iron (CGI) and Gray Iron (GI)

Abstract

Compacted graphite iron (CGI) has excellent comprehensive performance of strength, hardness, abrasion resistance, shock absorption and thermal conductivity as an ideal material for making engine parts. The material performance of CGI is compared with that of gray iron (GI) and spheroidal graphite Iron (SGI). Some research shows that the strong adhesion between the iron and the graphite forms semi-continuous chips when machining CGI which requires more energy than GI cutting, and there's no MnS layer on the cutting edge during CGI cutting. Thus, the cutting tool life of CGI is greatly reduced than GI. The experiment results indicate that the cutting forces of CGI milling are much higher than that of GI when the feed and the depth of cut increase.