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September 3, 2023
Meeting Abstract
Title
Precise parallel processing of a magnetic shape memory alloy using PECM
Abstract
In recent years, unrestrained demand in the direction of miniaturization, functionalization and function integration has been dominating innovations in the production landscape. Knowledge about the utilization of innovative key technologies as well as the use of state-of-the-art materials promises a competitive advantage. Materials such as shape memory alloys, among others, enable novel approaches to solutions, so that different companies are pioneering their industrial use. [1]
For example, the magnetic shape memory alloy NiMnGa is produced from a single crystal and can change its crystallographic structure by exposure to defined magnetic fields. The induced reorientation in the crystal lattice leads to an elongation of the material in one spatial direction, meanwhile a second spatial direction is shortened under constant volume. However, various studies show that conventional mechanical processing causes undesirable changes in the motion capability. [1 - 3] Precise electrochemical machining (PECM) is an alternative production technology to maintain the properties.
PECM has the ability to conduct shape-forming material processing. In particular, the process-related inferior influence of hardness or strength enables the economical machining of difficult-to-machine materials that are particularly hard or brittle. Consequently, this technology is favoured for the machining of shape memory alloys.
In the first part of the investigations, the electrochemical dissolvability is investigated according to DIN SPEC 91399 [4] to prove the individual dissolution capacity of NiMnGa in sodium nitrate on an industrially available PECM system. In the second part, the results manufactured with a customized fixture for EC parallel processing are presented and the used process parameters as well as the achieved dimensions and surface characteristics are discussed.
The project systematically examines an approach to parallel finishing machining of magnetic shape memory alloys for actuators using precise electrochemical machining.
References
[1] M. Laufenberg et al. International Conference on New Actuator Systems and Applications, 2022
[2] H. Behnken et al. Journal of Crystal Growth, 2020, 534, 125485
[3] B. Minorowicz et al. Materials, 2022, 15, 4400
[4] G. Meichsner et al. Procedia CIRP, 2016, 46, 123 - 126
For example, the magnetic shape memory alloy NiMnGa is produced from a single crystal and can change its crystallographic structure by exposure to defined magnetic fields. The induced reorientation in the crystal lattice leads to an elongation of the material in one spatial direction, meanwhile a second spatial direction is shortened under constant volume. However, various studies show that conventional mechanical processing causes undesirable changes in the motion capability. [1 - 3] Precise electrochemical machining (PECM) is an alternative production technology to maintain the properties.
PECM has the ability to conduct shape-forming material processing. In particular, the process-related inferior influence of hardness or strength enables the economical machining of difficult-to-machine materials that are particularly hard or brittle. Consequently, this technology is favoured for the machining of shape memory alloys.
In the first part of the investigations, the electrochemical dissolvability is investigated according to DIN SPEC 91399 [4] to prove the individual dissolution capacity of NiMnGa in sodium nitrate on an industrially available PECM system. In the second part, the results manufactured with a customized fixture for EC parallel processing are presented and the used process parameters as well as the achieved dimensions and surface characteristics are discussed.
The project systematically examines an approach to parallel finishing machining of magnetic shape memory alloys for actuators using precise electrochemical machining.
References
[1] M. Laufenberg et al. International Conference on New Actuator Systems and Applications, 2022
[2] H. Behnken et al. Journal of Crystal Growth, 2020, 534, 125485
[3] B. Minorowicz et al. Materials, 2022, 15, 4400
[4] G. Meichsner et al. Procedia CIRP, 2016, 46, 123 - 126
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Language
English