Machining of micro/miniature dies and moulds by electrical discharge machining—Recent development

Uhlmann, Eckart; Piltz, Sascha; Doll, Ulrich

doi:10.1016/j.jmatprotec.2005.06.013

Cited by 134 publications

(55 citation statements)

References 11 publications

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“…The fact that micro-forming tools are also subjected to forces that may exceed the capacity of available die materials presents a great challenge as these tools are prone to short tool life. New manufacturing methods have been developed, such as micro-electrical discharging machining: micro-wire EDM, micro die sinking, electrical discharge drilling, micro-electrical discharge milling and grinding, but the problem of the high forces exerted on the tools still needs to be resolved [5].…”

Section: Figure 1 Extruded Micro-partsmentioning

confidence: 99%

Influence of ultrasonic vibration on micro-extrusion

2011

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Section: Figure 1 Extruded Micro-partsmentioning

confidence: 99%

Influence of ultrasonic vibration on micro-extrusion

2011

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“…The complex part shapes in metallic carbides or high strength steels are usually manufactured by high energy density processes like electron beam, laser or electric discharge machining (EDM) [1][2][3]. The main advantage of these processes is the low dimensional dispersion comparatively to conventional machining process.…”

Section: Introductionmentioning

confidence: 99%

“…The EDM surface corrosion resistance has encountered little interest [19][20][21][22][23] despite of its importance for many applications of metallic components manufactured by this process and used in more or less aggressive environments typically in aerospace, nuclear power plant and biomedical dental implant industries [1][2][3][24][25][26][27][28]. Furthermore, the available data on the corrosion resistance of finished surface by EDM is incomplete and sometimes controversial to provide any meaningful conclusion.…”

Section: Introductionmentioning

confidence: 99%

Effect of electro discharge machining (EDM) on the AISI316L SS white layer microstructure and corrosion resistance

Sidhom

Ghanem

Amadou

et al. 2012

Int J Adv Manuf Technol

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract The localised corrosion resistance of austenitic stainless steels is strongly influenced by the quality of finished surface. EDM machining induces substantial changes by the high thermal gradients generated by electric sparks. Experimental techniques such as roughness measurement, scanning electron microscopy (SEM), energy dispersive microanalysis (EDX) and X-ray diffraction technique, reveal microgeometrical, microstructural, chemical and mechanical changes. These changes lead to white and heat-affected layers with a depth less than 100 μm. The white layer is a melted material characterised by dendritic structure and constituted by austenite, chromium carbide and ε-carbide. The heat-affected layer is characterised by very large grain size comparatively to the bulk material. Electrochemical test coupled with metallographic examinations using SEM reveals a weakening of the resistance to pitting and intergranular corrosion comparatively to diamond polished surface. This weakening is correlated to differences in structure and chemical composition of white layer. Susceptibility to stress corrosion cracking has been attributed to the field of tensile residual stresses resulting from thermal effects. The removal of the white layer material by polishing or wire brushing restores the corrosion resistance of the AISI316L SS.

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“…For machining of the patterns of more complex shapes, electro discharge grinding (WEDG) with the electrodes of micrometeric range (down to 20 µm) is reported to realize the micro structures of 5 µm and roughness of 0.1 μm. However, a maximum aspect ratio of micro structure is less than that of μEDM and only reaches 30 times of the wire diameter (Uhlmann et al, 2005). Surface resolution obtained by laser ablation is similar to that of micro cutting techniques making this method very popular for machining of the wide range of engineering materials (Gower, 2000).…”

Section: Mould Insert Fabricationmentioning

confidence: 92%

“…The heat in the form of pulsed discharge is applied through the thin metal wire (usually brass), allowing to cut through metal by melting and evaporation (Franssila, 2004). Based on this general description, there are a wide range of the μEDM techniques which may be classified by the type of electrode or/and electrodewww.intechopen.com workpeace movement (Franssila, 2004;Uhlmann et al, 2005). Size and precision of the pattern replication, to a great extent, depend on the size and shapes of the electrodes and eventually with optimum conditions aspect ratios of 100 may be realized (Franssila, 2004).…”

Section: Mould Insert Fabricationmentioning

confidence: 99%