PCBN Inserts from Kennametal Make Hard Turning More Cost-Effective


Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon
Kennametal PCBN insert

Kennametal’s KBH10B and KBH20B grades, designed for hard turning, are available in double-sided inserts for materials as hard as 65 HRC. The polycrystalline cubic boron nitride (PCBN) grades are specially designed to deliver higher productivity and longer tool life when turning tool steels and other hardened materials, according to the company.

Robert Keilmann, turning product manager, says that the inserts are ideal for “high-volume production of hardened gears, shafts, bearings, housings and other drivetrain components, where tooling cost per part is an important metric.”

Various features are said to make the PCBN mini-tipped inserts cost-effective for turning hardened steel components. A ceramic binder structure and TiN/TiAlN/TiN coating provide extreme wear resistance even at elevated cutting speeds, the company says. A gold PVD coating makes it easier to identify when an insert needs indexing, while the numbered corners ensure that a machine operator does not inadvertently switch to a used edge. Two edge preparations in a “trumpet-style” hone the inserts for heavier and interrupted cuts, while a light hone prepares the inserts for continuous turning. Both inserts are free-cutting, extending tool life and generating surface finish values as low as 0.2 Ra. The PCBN mini tips are offered in four insert shapes — three rhomboidal and one triangular — which provide up to six cutting edges per insert.


  • Non-Traditional Methods For Making Small Holes

    Consider these alternatives when conventional drilling can't do the job.

  • Rigid Tapping--Sometimes You Need A Little Float

    One of the most common methods of tapping in use today on CNC machines is 'rigid tapping' or 'synchronous feed tapping.' A rigid tapping cycle synchronizes the machine spindle rotation and feed to match a specific thread pitch. Since the feed into the hole is synchronized, in theory a solid holder without any tension-compression can be used.

  • Tips for Tapping Titanium Alloys

    Creating threaded holes in titanium alloys calls for proper techniques based on an understanding of both the properties of these materials and the peculiarities of the tapping process.