Estimation of the Lateral Gap in PECM: A Case Study on Tool Steel S390

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Abstract:

Pulsed Electrochemical Machining (PECM) is an established process that is characterized by the machinability of metallic workpieces regardless of their mechanical properties. Applications of PECM, such as the manufacturing of punches made from hardened tool steel, often utilize the lateral working gap for the final shaping of the workpiece. A major challenge in designing an economically viable removal process is the prediction of the lateral gap for certain targeted feed rates. This case study presents a design strategy for the design of PECM applications utilizing the lateral gap. Based on a characterization of the material removal characteristics of the hardened tool steel S390, preliminary experiments were conducted to characterize the relation between (1) the feed rate, the current density in the frontal gap and the voltage and (2) the lateral gap. Further, multiple parameter sets were derived for the machining with a targeted lateral gap. The validity of these parameter sets is verified experimentally. Based on these results, a cathode for the manufacturing of a demonstration punch was designed and manufactured. These demonstration punches were machined and the resulting dimensions evaluated. Lastly, fine adjustments regarding the process parameters were applied to achieve the targeted geometric accuracy.

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