Developed using a special direct conversion sintering method, Sumitomo’s SumiBoron NCB100 was unveiled as a breakthrough for turning high-specification hard-to-cut materials. Indeed, SumiBoron NCB100 gives up to 50 times greater insert life over more traditional carbide inserts, says the company.Moreover, the high stability of NCB100, which is based on an ultra-hard binder-less PCBN, is produced using grains just a few tens of nanometres in size that are directly bonded to each other.
Also launched and extending the binder-less technology in turning was Sumitomo’s NPD10 and DA90 inserts. NPD10 is targeted at the precision machining of tungsten carbide, while DA90, which has greater levels of stability due to its larger PCD particles, is suitable for the rough-machining of cemented carbide.
Giving greater stability when turning HRSA materials, Sumitomo demonstrated the application of its latest Absotech Bronze PVD-coated technology, which uses heat-resisting multi-layers of AlTiSiN as a thin-film edge coating for its AC5000 series tooling. AC5015S was launched for more general applications and AC5025S for heavier roughing cycles. The inserts have improved resistance to crater and notch wear, says Sumitomo.
For turning cast iron, the latest AC400K coated grade inserts have thicker CVD coatings, enabling cutting speeds up to 700 m/min to be achieved, including when machining grey and nodular materials.
Sumitomo also demonstrated its latest DGC45, a 45° face mill series which offers 16 cutting edges and the ability to machine depths up to 3 mm.Using Sumitomo’s patented ZX coating technology, tool life is said to be extended.
From the drilling stable, Sumitomo’s established SMDT indexable and regrindable head carbide drills feature the company’s latest alternative layers of TiAlcr and TiSi that form the DEX coating. SMDT tools are now available in smaller length-to-diameter ratios of 1.5xD, and greater ratios at 12xD, in addition to the existing 3xD, 5xD and 8xD. The series uses hardened steel bodies that accept multiple diameter tips in four different styles to maximise performance in stainless steel, super alloy and cast iron.
