Button insert milling grades introduced

Sumitomo Electric Hardmetal has released five different grades of RDMT button-style indexable inserts for carbon, alloy and stainless steels, as well as cast iron. The inserts are said to be advantageous in applications where high resistance to wear and insert fracturing is required.
Available in sizes of 8, 10, 12 and 16 mm inscribed circle, the five grades cover PVD-coated ACP100, 200 and 300, and CVD-coated ACK200 and 300 variants.
The ACP100 grade for milling steel and ACK200 for cast iron incorporate Sumitomo’s Super FF coating that the company says enables up to 1.5 times greater efficiency in machining and provides more than double the tool life of conventional grades under normal cutting conditions. Chipping resistance and adhesion strength are also said to be enhanced.
Similarly, the ACP200 and 300 grades for milling steel and ACK300 for cast iron employ Sumitomo’s Super ZX multi-layer nano-technology coating, which combines alternating 10nm thin layers of TiAN and AlCrN to deliver benefits matching those of Super FF.
The ACP200 is suitable for general milling in steel and die steels, while ACP300 is recommended for interrupted machining in stainless steel workpieces. Meanwhile, ACK300 has been developed for the general and interrupted milling of cast and ductile irons.
In a recent milling demonstration on die steel, the Sumitomo ACP200 grade increased the number of workpieces completed from 300 to 400, says the company. The machine was run at 150 m/min with 0.3 mm/tooth feed rate and 3 mm depth of cut.
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