Simulation-Assisted Tool Design for Pulsed Electrochemical Machining of Magnetic Shape-Memory Alloys

Simulation-Assisted Tool Design for Pulsed Electrochemical Machining of Magnetic Shape-Memory Alloys

Shape-memory alloys set high demands on the production technologies being used. During cutting, continuous heat input and mechanical stress have an undesirable influence on the shape-memory effect. Pulsed electrochemical machining (PECM), which is based on anodic dissolution, enables force-free mach...

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Bibliographic Details
Published in:Journal of Manufacturing and Materials Processing Vol. 8; no. 2; p. 46
Main Authors: Böttcher, Falko, Schaarschmidt, Ingo, Edelmann, Jan, Schubert, Andreas
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-04-2024
Subjects:
Ablation
Alloys
Anodic dissolution
Cathodes
Dissolution
Edge zones
Electrical insulation
Electrochemical machining
Electrolytes
Experiments
Fixtures
Machining
Manufacturing
NiMnGa
Numerical analysis
PECM
Process parameters
pulsed electrochemical machining
Shape effects
Shape memory alloys
shape-memory effect
Simulation
Simulation methods
Simulation models
Sodium nitrates
Specialty metals industry
Workpieces
Germany
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Summary:Shape-memory alloys set high demands on the production technologies being used. During cutting, continuous heat input and mechanical stress have an undesirable influence on the shape-memory effect. Pulsed electrochemical machining (PECM), which is based on anodic dissolution, enables force-free machining without thermomechanical influence on the edge-zone properties of the workpiece. Depending on the desired geometry, the development of a customized PECM fixture is necessary. The design of the fixtures is often based on the experiences of the designers and manufacturers, which often results in an estimation of the functionally critical dimensions. For this reason, the study focuses on a methodical approach for evaluating crucial fixture dimensions using knowledge of the specific material dissolution behavior linked with a numerical simulation model. It has been shown that the shape-memory alloy NiMnGa has a non-linear dissolution behavior in sodium nitrate. A reduction of stray currents up to 20% resulting from a lateral gap between the cathode and electrical insulation was demonstrated using numerical simulation. The study shows that a low cathode shaping height has the strongest influence on precise processing. Varying the process parameters allowed for the lateral gap to be adjusted between 0.15 and 0.25 mm.
ISSN:2504-4494
2504-4494
DOI:10.3390/jmmp8020046