Processing and Damping Properties of Sputtered NiTi Thin Films for Tools in Machining Processes


Nowadays, many manufacturing processes require the machining of complex forms with a high aspect ratio or cavities. Tools with a long overhang length are a common method to meet these requirements. Typical examples for this are boring bars for bore-turning and the milling with very long cutters. These tools tend to vibrate strongly due to their slender shape. The stress-induced transformation of austenite to martensite and the distinctive hysteresis loop allow the NiTi shape memory alloys (SMA) to absorb vibration energy. This article describes the innovative approach to dampen process vibrations by coating the tool shafts of cutting tools with long overhang with NiTi thin films. It explores how these thin films can be applied on polished tungsten carbide shafts and how their modal parameters are modified by these coatings. In a further step, this knowledge is used to calculate stability charts of corresponding machining processes. The study reported in this article identified the stabilizing effects of coatings with a thickness of 2-4 μm on milling processes. The minimum stability limit was increased by up to 200%.

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The authors acknowledge funding from the German Research Foundation (DFG) and NRW through the Special Research Centre SFB 459 (Shape Memory Technology).

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Correspondence to F. Kahleyss or R. Lima de Miranda.

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This article is an invited paper selected from presentations at Shape Memory and Superelastic Technologies 2010, held May 16-20, 2010, in Pacific Grove, California, and has been expanded from the original presentation.

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Kahleyss, F., de Miranda, R.L., Surmann, T. et al. Processing and Damping Properties of Sputtered NiTi Thin Films for Tools in Machining Processes. J. of Materi Eng and Perform 20, 500–505 (2011).

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  • damping
  • machining
  • NiTi
  • shape memory alloys
  • simulation
  • thin film