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Influence of the anode material on the breakdown behavior in dry electrical eischarge machining
(2012)Procedia CIRP ~ Fifth CIRP Conference on High Performance Cutting 2012In the last years dry electrical discharge machining (DEDM) has been proposed as an alternative to the traditional EDM. The main reason for these efforts is the absence of a liquid dielectric which results in a simpler and environmentally friendly machine. This paper presents measurements of the material removal rate in function of different tool electrode and work piece material put in relation with the breakdown behavior of the process ...Conference Paper -
Comparison of ground and laser machined polycrystalline diamond (PCD) tools in cutting carbon fiber reinforced plastics (CFRP) for aircraft structures
(2012)Procedia CIRP ~ Fifth CIRP Conference on High Performance Cutting 2012The extended use of carbon reinforced plastics (CFRP), especially in aircraft industries, requires efficient machining solutions due to superior mechanical properties with a lower weight compared to metals. This material is highly abrasive, requiring very hard cutting materials and additionally only a sharp cutting edge provides a sufficient surface quality on the workpiece. Ultrashort laser pulses and the focusability of high brilliance ...Conference Paper -
Analysis of The Chip Formation of Bainitic Steel in Drilling Processes
(2012)Procedia CIRP ~ Fifth CIRP Conference on High Performance Cutting 2012Continuously cooled bainitic steels have the potential to replace conventional quenched and tempered steels in automotive applications. Whereas the machining performance often decides about the cost effectiveness of a particular part, little general knowledge exists about the machinability of such novel steels. First practical experiences with drilling operations confirm the good machinability of bainitic steels as well as the potential ...Conference Paper -
Applying Wire Electrical Discharge Dressing (WEDD) to Improve Grinding Performance of Metal Bounded Diamond Wheels
(2012)Procedia CIRP ~ Fifth CIRP Conference on High Performance Cutting 2012In order to improve grinding performance of metal-bonded diamond wheels, a proper conditioning method has to be used. In this work, wire electrical discharge dressing (WEDD) is evaluated. With a self-designed WEDD-device the dressing process can be carried out inside a grinding machine, reducing non-productive time. Moreover, the in-process WED-dressing was assessed, showing potential for future applications. Dressing experiments indicated ...Conference Paper -
Die-sink EDM in meso-micro machining
(2012)Procedia CIRP ~ Fifth CIRP Conference on High Performance Cutting 2012Micro EDM has been identified since more than a decade as suitable process for machining complex shaped structures with high aspect ratio, though only through variations of EDM such as micro EDM milling, micro EDM drilling, coated electrodes etc. In the current paper, we present the research focused on analysing the capability for implementation of die-sink EDM in meso - micro scale machining (structures with surface area smaller than ...Conference Paper -
Effective Dynamometer for Measuring High Dynamic Process Force Signals in Micro Machining Operations
(2012)Procedia CIRP ~ Fifth CIRP Conference on High Performance Cutting 2012The authors present an innovative piezoelectric dynamometer (MicroDyn) providing the base for measuring high frequency signals in micro machining operations. Cutting tools with one or more cutting edges used in micro machining processes are mostly running with rotational speeds of more than 100’000 rpm, resulting in high excitation frequency. Thus, the interference of the excitation frequency of those processes with the natural frequency ...Conference Paper -
MHD printhead for additive manufacturing of metals
(2012)Procedia CIRP ~ 1st CIRP Global Web Conference: Interdisciplinary Research in Production Engineering (CIRPE 2012)Within the scope of additive manufacturing of metal parts, a droplet generator for metal melts is proposed. Its magnetohydrodynamic (MHD) working principle is shown and the actuation force available for droplet generation is calculated. The design of such a printhead is shown to consist only of very few, non-moving parts and therefore it is of great simplicity. First results gained with a prototype printhead show that successful droplet ...Conference Paper -
Modeling and simulation of electrical discharge machining
(2012)Procedia CIRP ~ 1st CIRP Global Web Conference: Interdisciplinary Research in Production Engineering (CIRPE 2012)Electrical discharge machining involves complex physical processes occurring simultaneously, which lead to the removal of material from both electrodes. During the discharge, material melts, evaporates and is ejected when the plasma channel collapses. Modeling the erosion process can help to better interpret and predict results, which are otherwise difficult to understand. In this work, the material removal rate is predicted based on the ...Conference Paper