Positioning by Standardized Shape Memory Alloy Actuators in Machining Applications

Actuators based on shape memory alloys (SMAs) have been developed to be used only in specialized applications. Therefore solutions based on SMAs generally cannot be transferred to other tasks. Focusing on the development for specialized applications has two important disadvantages. Firstly, the efforts and costs reach a high level due to the individual development and secondly, for many companies the development of complex SMA-actuators turns out to be an insuperable barrier. Reasons for this are the complex characteristics and the lack of simulation and design tools. In order to make statements about the functions and durability of the SMA-component, extensive tests need to be conducted. As a result there is a significant interest in providing SMA-actuator systems with complex and also variable functions. 

Apart from the conventional form of a modular system there is the possibility of a variable SMA-actuator system generated by standardized SMA-components which can be assembled to a stack system. The existing and unique potential of SMAs for function integration and therefore standardization can be used to its full extent. The aim of this paper is to show an application of such an SMA-actuator in stack design for positioning applications in machining applications. Besides, the study presents the development process and the control concept of this actuator.