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A Study on Micro-Machining Technology for the Machining of NiTi: Five-Axis Micro-Milling and Micro Deep-Hole Drilling

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Abstract

Micro-sized applications are gaining more and more relevance for NiTi-based shape memory alloys (SMA). Different types of micro-machining offer unique possibilities for the manufacturing of NiTi components. The advantage of machining is the low thermal influence on the workpiece. This is important, because the phase transformation temperatures of NiTi SMAs can be changed and the components may need extensive post manufacturing. The article offers a simulation-based approach to optimize five-axis micro-milling processes with respect to the special material properties of NiTi SMA. Especially, the influence of the various tool inclination angles is considered for introducing an intelligent tool inclination optimization algorithm. Furthermore, aspects of micro deep-hole drilling of SMAs are discussed. Tools with diameters as small as 0.5 mm are used. The possible length-to-diameter ratio reaches up to 50. This process offers new possibilities in the manufacturing of microstents. The study concentrates on the influence of the cutting speed, the feed and the tool design on the tool wear and the quality of the drilled holes.

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Acknowledgments

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

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Authors and Affiliations

  1. Institute of Machining Technology, Technische Universitaet Dortmund, Dortmund, Germany

    D. Biermann, F. Kahleyss, E. Krebs & T. Upmeier

Authors
  1. D. Biermann
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  2. F. Kahleyss
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  3. E. Krebs
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  4. T. Upmeier
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Corresponding author

Correspondence to D. Biermann.

Additional information

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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Biermann, D., Kahleyss, F., Krebs, E. et al. A Study on Micro-Machining Technology for the Machining of NiTi: Five-Axis Micro-Milling and Micro Deep-Hole Drilling. J. of Materi Eng and Perform 20, 745–751 (2011). https://doi.org/10.1007/s11665-010-9796-9

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  • DOI: https://doi.org/10.1007/s11665-010-9796-9

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