Ti-W-Si-Al Based Coated Tungsten Carbide End Mills In Cutting Hardened SteelⅠ

Abstract

In turning hardened steel, polycrystalline cubic boron nitride (cBN) compacts are widely used, due to their higher hardness and higher thermal conductivity. However, in milling hardened steel, fracture of cBN cutting tools readily occurs because they have poor fracture toughness. Therefore, coated cemented tungsten carbide tools, which have good fracture toughness and wear resistance, are generally widely used.

In this study, hardened steel (ASTM D2, JIS SKD11, 60HRC) was milled with three physical vapor deposition (PVD)-coated cemented tungsten carbide end mill cutters in order to determine effective tool materials for cutting hardened steel at high cutting speeds.

The coating films used  were (Ti,W)N/(Ti,W,Si)N and (Ti,W)N/(Ti,W,Si,Al)N coating films. (Ti,W,Si,Al)N is a new type of coating film. The inner layer of the (Ti,W)N/(Ti,W,Si)N and (Ti,W)N/(Ti,W,Si,Al)N coating system is (Ti,W)N coating film, and the outer layer is (Ti,W,Si)N and (Ti,W,Si,Al)N coating  films, respectively. Furthermore, commercial (Ti,Al)N-based coating film was also used.

(To be continued. This article is divided into several parts. Here is part 1. For part 2 please refer to http://news.chinatungsten.com/en/tungsten-information/80790-ti-10484)

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