NTK develops SX7 sialon ceramic insert grade for high performance in difficult materials

The sialon SX7 ceramic grade is suitable for difficult to machine materials such as Inconel 718 and 625, Waspaloy, Udimet and titanium. The round inserts can be used for both semi-finishing and profiling processes and also in NTK's diverse range of milling cutters. SX7 grade is available with three insert types. There is a round insert with a negative geometry for high feed roughing operations, while a round insert with a positive geometry is available for detailed machining and finishing. Furthermore, NTK has created a grooving insert that enables customers to conduct efficient grooving and parting with speeds and feeds that far exceed that of typical carbide inserts. Inserts are available as a solid round type or with a notch for the enhanced clamping rigidity required for high speed ceramic machining. The notch in the insert fits perfectly with a clamping screw. The negative and positive insert designations are compatible with NTK's robust CRDNN toolholders. These are available with toolholder heights of 20, 25 and 32 mm with a width of 10, 12.5 and 16 mm. These optimal toolholder dimensions enhance the rigidity and strength of the insert to eliminate potential vibration. Toolholders are available in overall lengths of 150 or 170 mm and they incorporate a quick release single-screw clamping unit that works in harmony with the insert seat design to optimise rigidity and tool life. NTK's CRDCN toolholders can accommodate the SX7 grooving inserts. Like the toolholders for high feed turning, the CRDCN are robust with an overall width and height of 25 or 32 mm and an overall length of 150 or 170 mm, depending upon the customer requirements. Additionally, the CRDCN toolholders incorporate a single screw clamping mechanism that locates the notch on the insert to improve rigidity.