Interrupted cuts in hardened steel: no problem for new CBN grade

A new CBN grade from Sandvik Coromant, CB7025, delivers good machining results in light to heavy interrupted cuts in case hardened steel. This grade can run at higher speeds and temperatures than competitor products and thereby extends the application of Sandvik Coromant cutting tools into a stronger offer for turning hard parts. It copes well with unstable conditions, increases quality and reduces cycle times while retaining surface quality when machining case hardened steels. Improved performance in operations that demand toughness makes grade CB7025 the first choice for turning case hardened steels, 58-65 HRc. The improved performance results from a combination of the fine grain polycrystalline CBN and its ceramic binder, which develops wear in a controlled way, and mechanically interlocked insert corners that offer strength and a superior level of security compared to standard insert edge designs. These properties offer a unique and reliable machining experience by allowing higher feed rates and the ability for finishing components in one pass while retaining surface quality. Productivity increases as a result. Available in a wide range of positive inserts, CB7025 also comes in two patented radius wiper geometries that allow significant performance improvements. -WH geometry is for high surface quality with reduced cutting forces and -WG geometry focuses on providing the best preparation for a finishing cut while running at high feed rates. These are less sensitive to misalignment than conventional wipers. Increased cutting depth results from the large, solid CBN corners. Larger cutting depths become possible when machining up to shoulders, undercuts and in other profiling operations.