Ceramic end mills from Sandvik Coromant take the heat in HRSA machining

Sandvik Coromant is releasing two series of ceramic end mills for optimised performance in nickel-based alloys. The latest brazed ceramic CoroMill 316 and ceramic CoroMill Plura end mills offer a more productive method for shoulder and face roughing in ISO S materials than standard carbide milling cutters, says the company.

“The ceramic substrate of the latest CoroMill 316 and CoroMill Plura end mills allows for a different cutting process than traditional solid carbide tools,” explains Tiziana Pro, global product manager solid end mills at Sandvik Coromant. “Our CC6060 grade is purpose-designed for the superior machining of nickel alloys, and is supported by negative geometry that provides a tough cutting edge.”

In fact, six-flute geometry is said to deliver highly productive side milling operations, while four-flute geometry boosts face milling in both the CoroMill 316 and CoroMill Plura versions. Choice between the two depends on machine conditions and application. Those seeking solutions to difficult-to-reach applications, or looking for extra flexibility courtesy of the exchangeable-head system, should opt for CoroMill 316, while engineers requiring superior stability are advised to select CoroMill Plura.

Ceramic tools retain their hardness at the high temperatures associated with milling heat resistant super alloys (HRSAs). As a result, Sandvik Coromant says that 20 to 30 times the speed can be achieved in comparison with solid-carbide tools, delivering considerable potential for increased productivity. A stable set-up is advised, without coolant application as it would simply burn at the high temperatures involved.

Beyond shoulder milling and face milling, the end mills can also be used for pocket milling, helical interpolation, ramping and slot milling. The series also includes a ceramic ball-nose version of CoroMill 316 for blisk machining. This profile-milling solution is suitable for semi-finishing operations.