Automated Analysis of Pulse Types in High Speed Wire EDM

Oßwald, Kai; Lochmahr, Ingo; Schulze, H.‐P.; Kröning, Oliver

doi:10.1016/j.procir.2017.12.157

Cited by 24 publications

(19 citation statements)

References 11 publications

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“…However, it is very challenging to identify single Fig. 2 Pulse types in HSWEDM according to [1]. Pulse types 1 through 3 can be regarded as discharges that are relevant for the generation of discharge craters Consequently, the geometry of single discharge craters on the workpiece electrode (anode) was investigated in this research using an optical 3D profilometer.…”

Section: Craters Of Moving Foot Points Due To Dischargesmentioning

confidence: 99%

“…High Speed Wire Electrical Discharge Machining (HSWEDM) has been described as a hybrid machining process in which different types of electric pulses lead to material removal [1]. In addition, a number of other features mark its difference to conventional wire EDM.…”

Section: Introductionmentioning

confidence: 99%

“…However, one fundamental difference to other electromachining processes-as mentioned above-consists in the high velocity of the wire electrode relative to the workpiece electrode. The absolute distance of this movement Δx is dependent of the wire velocity v w and the discharge duration t e as shown in equation (1).…”

Section: Introductionmentioning

confidence: 99%

“…The material removal mechanisms are closely linked to the types of discharges that occur in a process. For the HSWEDM process, this has been investigated in [1]. The different pulse types found in that publication are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation into material removal mechanisms in High Speed Wire EDM

Oßwald

Brandl

Lochmahr

2020

Int J Adv Manuf Technol

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High Speed Wire EDM (HSWEDM) is characterized by high relative velocities between its electrodes which appear in almost no other field of electrical discharge machining (EDM). Also, it previously has been described as a hybrid process. Consequently, material removal mechanisms show significant differences compared with other EDM processes. In this research, single discharge craters of HSWEDM processes were examined, and their geometrical features were associated with the underlying parameters. Discharge crater geometries on the workpiece electrode (anode) could be investigated by measurements whilst those on the wire electrode (cathode) were calculated. Results show that the high wire velocity leads to moving foot points on both electrodes. Pulse duration and the type of working medium influence the generation of discharge craters and thus their geometry and the modes of material removal. Static discharges and anodic dissolution could also be identified as material removal mechanisms and characterized in their geometrical properties. However, they are of secondary importance.

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Section: Craters Of Moving Foot Points Due To Dischargesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation into material removal mechanisms in High Speed Wire EDM

Oßwald

Brandl

Lochmahr

2020

Int J Adv Manuf Technol

Self Cite

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“…The wires commonly used in the WEDM process are made of brass and molybdenum [ 21 , 22 ]. However, the use of molybdenum wire is more common in the cutting industry as compared to brass wire it offers a low wear rate and can be used repeatedly [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

High Aspect Ratio Thin-Walled Structures in D2 Steel through Wire Electric Discharge Machining (EDM)

et al. 2020

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Thin structures are often required for several engineering applications. Although thick sections are relatively easy to produce, the cutting of thin sections poses greater challenges, particularly in the case of thermal machining processes. The level of difficulty is increased if the thin sections are of larger lengths and heights. In this study, high-aspect-ratio thin structures of micrometer thickness (117–500 µm) were fabricated from D2 steel through wire electrical discharge machining. Machining conditions were kept constant, whereas the structure (fins) sizes were varied in terms of fin thickness (FT), fin height (FH), and fin length (FL). The effects of variation in FT, FH, and FL were assessed over the machining errors (FT and FL errors) and structure formation and its quality. Experiments were conducted in a phased manner (four phases) to determine the minimum possible FT and maximum possible FL that could be achieved without compromising the shape of the structure (straight and uniform cross-section). Thin structures of smaller lengths (1–2 mm long) can be fabricated easily, but, as the length exceeds 2 mm, the structure formation loses its shape integrity and the structure becomes broken, deflected, or deflected and merged at the apex point of the fins.

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