Different material of end mill
HSS: It is the largest tool material tonnage currently used. It has good wear resistance and is cheaper than cobalt or carbide end mills. Universal milling for non-ferrous and non-ferrous materials. The HSS tool is very robust and suitable for interrupted cutting and for the manufacture of complex shaped tools such as drills, reamers, taps, dies and gear cutters.
HSSCoM42: It consists of molybdenum HSS alloy with an additional 8% cobalt content. Its abrasion resistance is better, hardness and toughness are higher than HSS. Under severe cutting conditions, there is very little chipping or micro-cracking, making the tool 10% faster than HSS. This achieves a good material removal rate (MRR) and a good surface finish.
HSSCoPM: The powder metal (PM) utilizes the advantages of two materials, namely the toughness of cobalt, and the heat resistance and wear resistance of microcrystalline carbide tools. In these applications, it requires a higher MRR and is susceptible to vibrations such as rough operation. This is an effective method of replacing solid carbides.
Ceramics: Many grades of ceramics are used to make end mills. Ceramic grades have good wear and abrasion resistance, no conductivity, and excellent thermal properties. Ceramics are recommended for the machining of cast iron and nickel-base superalloys at intermediate cutting speeds.