Disadvantages Of High Speed Machining
High speed machining (HSM) at significantly increased cutting speeds and feed rates can lead to a considerable reduction in machining time. Therefore, HSM is now recognized as one of the key manufacturing technologies for higher productivity. Other key advantages of HSM have been reported as high material removal rates, low cutting forces, and improvement in part precision and surface finish (Fallbohmer et al., 2000). The distinction between conventional and high speed machining is based on the workpiece material being machined, type of cutting operation and the cutting tool used. Figure 1 shows the generally accepted cutting speeds for high speed machining of various materials (Schulz and Moriwaki, 1992). For example, a cutting speed of 100 m/min is considered as high speed for cutting nickel alloys whereas this cutting speed is considered to be in the conventional range for cutting steel. …show more content…
Among the coatings available in the market, titanium-based thin films have found the widest acceptance. They tend to improve the wear resistance in many cutting applications (König, 1992; Rech and Djouadi, 2001), by reducing friction, adhesion, diffusion, and by relieving thermal and mechanical stresses on the substrate. Furthermore, physical vapour deposition (PVD) based TiN coatings are widely used to improve the tribological and mechanical properties of the cutting tool (Erdemir and Hochman, 1988; Wallen and Hogmark,
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