Measurement equipment for investigation of the influence of viscosity of dielectric working fluids on spark erosion

Schulze, H.‐P.; Wollenberg, G.; Lauter, M.; Storr, M.; Rehbein, W.

doi:10.1109/icdl.2002.1022754

Cited by 6 publications

(3 citation statements)

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“…Even shorter exposure durations between 10 and 25 ns must be used in order to attribute changes of structure in the discharge channel to current rise or current fall [9]. The different "adhesion times" of the "first" gas bubble are determined by the electrode arrangement.…”

Section: Influence Of the Pulse Durationmentioning

confidence: 99%

Investigation of gas bubble formation at spark erosion in small working gaps

Schulze

Wollenberg

Mecke

2006

IEEE Trans. Dielect. Electr. Insul.

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Gas bubble formation, especially in small working gaps, has an important influence on the spark erosion process. This paper demonstrates that the gas bubbles originate from electrical discharge in the dielectric. Investigations are carried out for two typical dielectrics: hydrocarbon (n-dodecane) and de-ionized water. From the experimental results obtained with single pulses conclusions are drawn about what happens at discharge sequences like in a micro-erosion process.

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Section: Influence Of the Pulse Durationmentioning

confidence: 99%

Investigation of gas bubble formation at spark erosion in small working gaps

Schulze

Wollenberg

Mecke

2006

IEEE Trans. Dielect. Electr. Insul.

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“…A challenge is the production and processing of such structures. That is why we are investigating the processing parameters cutting of inhomogeneous metallic structures at this point by Wire -ECM [3,4] and Wire -EDM [5,6]. In this study, is used steel wool with a fiber thickness of 35 µm.…”

Section: Introductionmentioning

confidence: 99%

Special Features of the Non-Conventional Cutting (ECM, EDM) of Wool-Like Material Structures

Schulze¹,

Herzig²,

Kroening³

et al. 2022

KEM

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The non-conventional cutting of electrically conductive materials using WEDM and WECM and their hybrid processes is already standard in manufacturing technology. This is essentially based on homogeneous or layered materials. In the future, cellular, wool-like, or similarly structured materials will play a greater role and will be more important; especially the cutting in conjunction with homogeneous materials. In the study, experiments were carried out with a standard WEDM system and a WECM test system. In preliminary tests, various EC machine structures with different flushing and cutting directions have been tested, and because of the static wire arrangement, adjustments to a maximum working current have been tried out. Various feed speeds have been implemented for the test series and the influence of the wool structure on the regulation of the short circuits in the working gap has been analyzed. A modified equivalent circuit diagram has been created from the special features of the processing. The process regulation must be adapted to the special conditions of the spontaneous working gap reduction and thus the higher number of soft short circuits. The study should primarily show where the deviations of the WEDM and WECM from wool structures are; which changes have to be made, especially for process regulation. Secondarily, it was determined which cutting structures arise and whether the partial discharges have a marginal effect on the cutting result in both processes.

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“…Micro-EDM is a thermal process similar to laser machining in that it leaves a recast layer on the surface after machining. Proper spark discharging is a complex sequence of events which is still being debated after more than 60 years [15][16][17][18][19][20][21][22] of use. The first stage after a sufficient voltage which is applied between the tool and the workpiece is electron migration, ionization and electron avalanching.…”

Section: Introductionmentioning

confidence: 99%

Achieving precision in high density batch mode micro-electro-discharge machining

Richardson¹,

Gianchandani²

2007

J. Micromech. Microeng.

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This paper reports a parametric study of batch mode micro-electro-discharge machining (µEDM) of high density features in stainless steel. Lithographically fabricated copper tools with single cross, parallel line and 8 × 8 circle/square array features of 5-100 µm width and 5-75 µm spacing were used to quantify trends in machining tolerance and the impact of debris accumulation. As the tool feature density is increased, debris accumulation effects begin to dominate, eventually degrading both tool and workpiece. Two independent techniques for mitigating this debris buildup are separately investigated. The first is a passivation coating which suppresses spurious discharges triggered from the sidewalls of the machining tool. By this method, the mean tool wear rate decreases from a typical of about 34% to 1.7% and machining non-uniformity reduces from 4.9 µm to 1.1 µm across the workpiece. The second technique involves a two-step machining process that enhances the hydrodynamic removal of machining debris compared to standard methods. This improves surface and edge finish, machining time and tool wear.

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Measurement equipment for investigation of the influence of viscosity of dielectric working fluids on spark erosion

Cited by 6 publications

References 0 publications

Investigation of gas bubble formation at spark erosion in small working gaps

Investigation of gas bubble formation at spark erosion in small working gaps

Special Features of the Non-Conventional Cutting (ECM, EDM) of Wool-Like Material Structures

Achieving precision in high density batch mode micro-electro-discharge machining

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