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Functional edge shaping of micro bores by applying electrochemical machining

 
: Schubert, Andreas; Meichsner, Gunnar; Hackert-Oschätzchen, Matthias; Zeidler, Henning

Shore, P. ; European Society for Precision Engineering and Nanotechnology -EUSPEN-:
12th International Conference of the European Society for Precision Engineering and Nanotechnology 2012. Proceedings. Vol.2 : June 4th - 7th 2012, Stockholm, Sweden
Bedford: Euspen, 2012
ISBN: 978-0-9566790-0-0
pp.420-423
European Society for Precision Engineering and Nanotechnology (EUSPEN International Conference) <12, 2012, Stockholm>
English
Conference Paper
Fraunhofer IWU ()
electrochemical machining; edge shaping; micro bores

Abstract
Micro bores are used for several high-precision applications, especially in hydraulic systems and fuel injectors. In this case the shape, particularly the edge rounding of the injection spray hole, has a significant influence on the atomization of fluids and therefore also on the combustion process [1]. Usually these micro bores are machined by electrical discharge machining (EDM) [2]. In EDM sharp edges occur due to the process characteristics and a specific influence on the edge shape is not possible. Thus, a specific and independent adjustment of the edge rounding is required. To produce such a defined edge rounding of bores, an Electrochemical Machining (ECM) process has been investigated. This process is based on a localized anodic dissolution of the sample material that is connected to a positive electric potential.
The advantages of this process lie in the possible high localization of the erosion process and high achievable surface quality. The tool which is the cathode has a negative potential and determined by the design of the edge rounding [3]. An experimental set-up was developed in order to perform the investigations. This paper presents the setup and experimental investigations.

: http://publica.fraunhofer.de/documents/N-211269.html