Multilayer Insert Coating Enhances Steel Machining

Kyocera Corp. has developed a durable coating technology and base material for its indexable cutting tool inserts. The CA025P CVD coated carbide grade is designed for durability and resistance against wear, fracturing and chipping.

The company’s new cutting tool series features this multilayer CVD coating with a layer using a thick film of aluminum oxide for high heat resistance. Cemented carbide is used as a base material to promote fracture resistance, long-term performance and longer tool life. During the cutting process, the surface structure of the coating resists welding and chipping of the insert.

The cutting tools accommodate a range of machining applications from roughing to finishing with the availability of four chipbreaker styles: PG, GS, PQ and PP. The PG chipbreaker is for interrupted medium to roughing-type machining, providing good chip control and a tough cutting edge for stability. The GS chipbreaker, for continuous machining, offers low resistance with complex land. The PQ chipbreaker, for finishing to medium cutting, prevents chip clogging and lowers cutting resistance during high-feed machining. The PP chipbreaker, for finishing, prevents chip clogging and chip recutting at higher feed rates and small depths of cut. The tools are designed to reduce the frequency of insert replacements and to improve production yield.