Hard part turning
CB7025 – excels in demanding cuts of case hardened steels

A unique application for interrupted cuts and ability to retain high quality surfaces in the machining of case hardened steels signifies the next stage in the Sandvik Coromant hard part turning offer. CB7025 offers unbeatable performance in unstable conditions and an optimized solution for improved security and reliability. Thanks to dedicated grade properties and the strong Safe-Lok insert design; the CBN insert range extends productivity boundaries within the mass production industry by increasing quality and reducing cycle times. Edge identification system Each insert edge is permanently marked to give quick and easy reference for order of use. Success stories Application area For cutting data - see our catalogue supplement Increased speed (vc) capability CB7025 is a polycrystalline CBN grade of fine grain size with a unique ceramic binder. In continuous to heavy interrupted cuts, this grade can run at high speeds and temperatures and still develop wear in a controlled way. Increased feed (fn) with Sandvik Coromant wiper technology Machine at higher feed rates and still obtain process reliability. This is possible through a patented radius configuration that is less sensitive to misalignment than conventional wipers. Increased cutting depth (ap) with large, solid CBN corners Larger cutting depths become possible when machining up to shoulders, undercuts and in other profiling operations. Safe-Lok multi-corner technology Mechanically interlocked CBN corners brazed far from the hot cutting zone provide strength and security superior to conventional tip designs. Safe-Lok braze Conventional braze Optimized for reliability Maintaining a good surface finish throughout the tool life is a key factor in HPT success. To preserve edge strength and reliability, crater wear develops at a point further away from the edge line for a unique benefit, especially in demanding operations. Edge line Crater Success stories CB7025 was tested against a competitor grade in dry conditions. The grade properties and cutting edge length provided by CB7025 gives better results when machining forged components with varying depth of cut. CB7025 was tested against an established solution in unstable conditions and showed an increase in the number of components produced per insert. The ability of CB7025 to maintain edge line properties under difficult conditions allows for a significant productivity increase. Component: Synchromesh ring, gear, 59 HRC Operation: Internal diameter, facing of inner ring Cut: Roughing Coolant: No Depth of cut (ap) mm: 0.6 Feed (fn) mm/r: 0.11 Speed (vc) m/min: 160 Result + 30% components per edge + Consistent tool life + Reduced tool change frequency Component: Camshaft gear Operation: Internal and external facing, bore Cut: Finishing Coolant: Yes Depth of cut (ap) mm: 0.1-0.2 Feed (fn) mm/r: 0.12 (previous 0.09) Speed (vc) m/min: 110 (previous 90) Result 40% less total machining time top of page Application area For turning heavy interrupted cuts in case hardened steel (58-65 HRC) CB7025 inserts are the first choice. Guaranteed for excellent performance and reliability in demanding interruptions, they even perform well in continuous cuts and over shorter total cut lengths. Cutting speed Continuous cut Light interrupted cut Heavy interrupted cut Application toughness top of page previous

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