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Walter USA’s Tiger-tec Silver line of high-performance inserts now includes the RK 5 and RK7 geometries designed to enhance cutting speed, reliability and tool life in ISO K (cast iron) materials. The new geometries feature a plateau step between the location face and the cutting edge, enabling grinding of the location face after coating. The resulting evenly ground faces ensure that they can be seated with maximum stability, the company says. As a result, the inserts reduce cutting-edge wear, enhance tool life and increase process reliability, particularly in cases of high dynamic loads.

The RK5 is a classic flat-top insert without a chip groove, designed for speed, reliability and increased tool life, particularly in grey cast iron. RK7 is a robust insert designed for heavy interrupted cuts, large depth-of-cut variations with uneven material removal, and hard cast skin. Its geometry is similar to the RK5 but with a protective chamfer on the cutting edge. This insert is suitable for hard and soft machining of hardened steels ranging from 40 to 62 HRc.

In addition to the new geometries, the company offers the WKK10S and WKK20S Tiger-tec Silver grades suitable for use with grey cast iron, ductile cast iron and compacted graphite cast iron. WKK10S is well-suited for continuous and light interrupted cuts, and is capable of dry machining. WKK20S, a universal cutting grade, can be used for both wet and dry machining and is said to provide high process reliability for workpieces with interrupted cuts, cast skin or cross-holes.