High-speed micromachining characteristics for the NiTi shape memory alloys
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Increasing use of the nitinol (NiTi), the nickel titanium alloy is primarily due to the fact that the medical fraternity is looking more toward less invasive medical procedures. Microengineering features such as microslots, grooves, and profiles of size 0.5 mm and below are required in the NiTi alloy-based medical components, but the material offers tremendous manufacturing difficulty due to its superior mechanical properties. High-speed micro machining was viewed as a possible way to process the NiTi-based medical components without compromising the productivity and quality of the machined surface textures. A study was undertaken to characterize the high-speed micromachining process for the NiTi alloy. More specifically, the optimization of the machining process parameters with the objective of reducing the milling forces and burr formation was focused upon. The study unveiled that the understanding the tool-work interface behavior is critically important for maximizing the machining performance of the NiTi alloy. Machining behavior characterized in terms of low cutting forces and reduced burr size was achieved at 15 m/min of cutting speed when the NiTi alloy undergoes a transition from B2 phase to B19 phase.
KeywordsHigh-speed micromachining NiTi alloy Microslot Phase transition Strain hardening
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