F. Kahleyss, T. Upmeier, Technische Universitaet Dortmund, Dortmund, Germany; D. Biermann, Technische Universität Dortmund, Dortmund, Germany
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 paper offers a simulation based approach to optimize micro five axis 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 and the feed on the tool wear and the quality of the drilled holes. The aforementioned process is compared to the laser deep hole drilling process of NiTi SMA.
Summary: The paper offers a simulation based approach to optimize micro five axis 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.
