Electrochemical micromachining of Hastelloy B-2 with ultrashort voltage pulses

Electrochemical micromachining of a Zr-based bulk metallic glass using a micro-tool electrode technique

“…the gap between hole dimension and tool dimension narrows by reducing the pulse length. The determined dependence is fairly linear within the error limits, which is in an agreement with previously published results on the ECMM of conventional crystalline metals [19,21].…”

“…A DC bias was supplied to the WC tool electrode by applying a voltage between the WE and Tool (U bias ). The ultra-short pulse circuit has been constructed according to the method described by Maurer et al [21]. High frequency pulses were superposed over the DC bias throughout a wide band transformer (Tr e Coilcraft WB1-6L) terminated with a 50 U resistor for impedance matching.…”

“…9 shows the influence of the pulse length expressed with the on-time t on on the shape of structures machined at U pulse-gen. ¼ 6 V. It is apparent that the size of the hole prepared with a longer t on is greatly increased and at the same time the principal morphology of the holes remains unaffected. In order to investigate the influence of a pulse length on the size of machined structures, a machining resolution parameter was calculated as R hole ÀR tool [19,21], where R hole and R tool are the radii of a hole and a tool tip, respectively. The R hole ÀR tool values are plotted vs. the ontime t on (wpulse length) in Fig.…”

Discussion of ultrashort voltage pulses electrochemical micromachining: a review

“…The workpiece in ns-PECM can be shaped with different typical for ECM kinematics variants as sinking or hole drilling [1,10,12,14,32,34,49], machining with universal electrode tool [13,15,28,50] or in kinematic analogous to wire cutting [41,46,51,53]. Selected examples of application were presented in Figs.…”

“…Therefore, the amount of research works in this field have increased significantly. The research are mainly carried out in South Korea [1, 12-15, 34, 41], Singapore and China [10,28,46,[49][50][51][52][53], Poland [23,24,38,43], and the USA [32]. These papers mainly concern issues of machining resolution and practical application of ns-PECM process.…”