Development of a new generator for die sinking electrical discharge machining

Giandomenico, Nicola (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Gorgerat, Florian-Henri (School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Lavazais, Bertrand (+GF+ Machining Solutions, Meyrin, Switzerland)

Commonly, on Die Sinking Electrical Discharge Machining (DS EDM), a special generator enables current pulses in sinusoidal or triangular shapes, only in a single polarity. The duration and the amplitude are adapted to the machining sequence, allowing the achievement of different surface finishing. By using a new configuration, it is shown that if one applies pulses of current in both polarities, related together but with a certain ratio between the positive and the negative peaks current, machining results could be improved. The purpose of this new generator is the ability to control with great flexibility the generation of these pulses, in terms of durations, amplitudes and sequence. These parameters can be independently selected for the positive and negative polarity and modified during the machining. One can also choose a special predefined or settable sequence of pulses. The generator includes also the double polarity ignition and the high-speed gap breakdown detection. An embedded programmable circuit (FPGA) provides a high-speed control of the sequence. Machining tests have been performed in order to explore and quantify different sequences of pulses in terms of machining results and performances achieved, compared against the current situation.


Keywords:
Conference Type:
full paper
Faculty:
Ingénierie et Architecture
School:
HEPIA - Genève
Institute:
inSTI - Institut des Sciences et Technologies industrielles
Publisher:
Tokyo, Japan, 18-22 April 2016
Date:
2016-04
Tokyo, Japan
18-22 April 2016
Pagination:
6 p.
Published in:
Procedia CIRP ; Proceedings of 8th CIRP Conference on Electro Physical and Chemical Machining (ISEM XVIII), 18-22 April 2016, Tokyo, Japan
Numeration (vol. no.):
pp. 721-726
DOI:
ISSN:
2212-8271
Appears in Collection:



 Record created 2020-03-13, last modified 2020-03-27

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