The cutting material PcBN(polycrystalline cubic boron nitride)is both ultra-hard and extremely temperature-resistant, making it a challenge to process. To enable cutting tool manufacturers to grind PcBN cutting edges with high levels of precision, users of the Vollmer VGrind 360S tool grinder can now take advantage of an optional dressing unit.

By adapting its VGrind 360S grinding machine, the sharpening specialist can make it suitable for machining PcBN tools. Considered the hardest cutting material in the world after PCD (polycrystalline diamond), PcBN can achieve an operating life of up to 25 times longer than solid-carbide tools. In fact, PcBN retains almost all of its original hardness at temperatures up to 1200°C.

The VGrind 360S grinding machine is positioned for the precise machining of PcBN tools with its stable wall concept and rigid, compact design. High system rigidity, in combination with the drive of the X, Y and Zaxes via linear induction motors, allows tool manufacturers to machine a PcBN cutting edge with the grinding wheel oscillating across its contact surface for a chip-free, high-quality surface.

To support the processing of this ultra-hard material, the optional dressing unit for the grinding wheel on the VGrind 360S means that after roughing the PcBN cutting edge, the dressing unit re-profiles the grinding wheel to regain its precise concentricity and correct geometric shape. Subsequent finishing operations give the PcBN tool the desired surface finish and geometric accuracy.

Customers can also retrofit the optional dressing unit with software updates to existing VGrind 360S machines. Tool manufacturers can carry out the installation independently or with the support of the Vollmer service team in just a few simple steps.

More information www.vollmer-group.com/en-uk