Material selection and coating technology for rough machining milling cutters

Seven Roughing Milling Cutter Materials Choices

Roughing milling cutter materials must combine edge toughness, compressive strength, wear resistance, and thermal stability. Coarse chip loads and interrupted engagement can damage a grade that is too brittle, while a grade that is too soft may wear rapidly. Fine-grain and ultrafine-grain carbide are common choices because binder content and grain size can be adjusted for the application.

Seven selection factors are carbide grade, cobalt content, grain size, coating chemistry, coating adhesion, workpiece hardness, and cutting conditions. TiAlN or AlTiN-type coatings can improve hot hardness and oxidation resistance, while other coatings may reduce friction or resist abrasion. The coating must bond well and preserve the serrated roughing geometry instead of rounding critical edges.

Choose roughing milling cutter materials by workpiece alloy, hardness, abrasiveness, machine rigidity, coolant, cutting speed, feed, and radial engagement. Monitor chips, sound, vibration, temperature, flank wear, chipping, and finish during trials. A capable cutting tool supplier can match substrate and coating. General coated cutting tool principles also help compare adhesion, thermal behavior, friction, and practical tool life.