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The paper deals with the end-milling machinability of α-β titanium alloy (Ti-6AI-4V alloy) by new PCD (Polycrystal-line Diamond) cutting tools at high cutting speeds in order to develop a new technology for a high productivity titanium finishing. The main focus of this paper is on investigating the relationships among cutting conditions, PCD tool materials, and tool wear. It was found that the edge engagement time of cutting tools with titanium workpiece has a great effect on PCD tool wear. Compared to cemented carbide tools, PCD tools have a longer tool life, especially at higher cutting speeds. The geometric shape of cutting edges and tool material greatly influences the performance of PCD tools in cutting titanium alloy.

(PCBN)Polycrystalline cubic boron nitride cutting tools have been widely used for hard turning of cutting ferrous materials such as hardened steels. In high-speed interrupted cutting, however, despite their high potential to increase productivity, they have not been enthusiastically adopted by industries due to the unreliability against tool failure. This has prompted the need for a new PCBN material with high reliability against tool failure. The newly developed PCBN remarkably increases the machining reliability against tool failure at high-speed interrupted cutting of hardened steels.