Ceramic Inserts For Hard Turning

Flank wear also commonly appears in hard part turning and typically indicates a need to reduce speeds.

Ceramic inserts for hard turning.

Since hard parts are usually at the end of the part creation cycle there is a high amount of value in the part already. The life of cbn inserts typically is more predictable than that of ceramic inserts. Kyocera s ceramic inserts are designed to resist oxidation and maintain hardness at elevated temperatures. With a properly tuned hard turning process these inserts are second only to grinding in terms of holding diameter tolerances.

However the cbn pcbn and ceramic inserts can be expensive especially when compared with the relatively low costs of grinding wheels. Features of ceramic inserts. Predictability of tool life is extremely important in hard part turning said geisel. For many jobs in the 45 to 65 rc hardness range in which grinding was historically the process of choice hard turning and hard milling with ceramic insert cutters are finding increasing acceptance in shops.

For steels softer than approximately 55 hrc use ceramics or cemented carbide inserts. Superior heat resistance enables high speed machining aluminium oxide ceramic. Use optimized cbn grades for hard part. Ceramic is not as tough as cbn and it normally is not used when tolerances are tighter than 0 001 inch.

When hard turning with ceramic or cbn inserts crater wear will occur on optimized processes though if it occurs excessively there may be a need to reduce speeds or switch to an insert with a lower cbn content and better wear resistance. Cubic boron nitride cbn grades are the ultimate cutting tool material for hard part turning of case and induction hardened steels. Ceramic inserts are recommended for turning of carbon and alloy steels 38 64 rc or rough finish turning of cast iron.