Prédiction par calcul de la rugosité totale d'une surface usinée par électroérosion

Ghanem, Farhat; Atig, Kaïs Ben; Salah, Nizar Ben; Braham, C.

doi:10.1051/mattech:2007016

Mater. Tech.

2006

DOI: 10.1051/mattech:2007016

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Prédiction par calcul de la rugosité totale d'une surface usinée par électroérosion

Farhat Ghanem¹,

Kaïs Ben Atig²,

Nizar Ben Salah³

et al.

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Cited by 3 publications

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“…Electro-discharge machining (EDM) is widely used for manufacturing of mechanical components with complicated shapes made on hard materials such as high-alloys, highspeed steels, and refract alloys [1]. It was reported that the high thermal effects generated during the material removal by this process induce mechanical, metallurgical and F. Ghanem : N. B. Fredj : H. Sidhom (*) chemical modifications at the upper layers of the machined surfaces [2][3][4][5][6][7][8][9]. These layers are characterised by high work hardening, high tensile residual stresses and wide thermal crack networks that have detrimental effects on the fatigue life of EDM components [5,[8][9][10][11].…”

mentioning

confidence: 99%

Effects of finishing processes on the fatigue life improvements of electro-machined surfaces of tool steel

Ghanem¹,

Fredj²,

Sidhom³

et al. 2010

Int J Adv Manuf Technol

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Machining the EN X160CrMoV12 tool steel by electro-discharge machining (EDM) process generates significant modifications of microgeometrical, microstructural and mechanical properties of the upper layers of the machined components. In this paper, the role of these modifications in controlling the stability, under cyclic loading, of the propagation of the crack networks generated by EDM is discussed. High cycle fatigue tests (2×10 6 cycles) show that the presence of these cracks in brittle layers, i.e. white layer, quenched the martensitic layer, and a field of tensile residual stresses (+750 MPa) results in a loss of 34% of endurance limit comparatively with the endurance evaluated for the milled state that generates crack-free surfaces. It is shown, in this work, that the detrimental effect of these crack networks can be controlled by putting in compression the upper layers of the EDM surfaces. Indeed the application of wire brushing to EDM surfaces generates compressive residual stresses (≈−100 MPa) that stabilise the crack networks propagation and therefore restores to the EDM surfaces their endurance limit value corresponding to the milled state. Moreover, removing the crack networks by polishing generates a stabilised residual stress value of ≈−130 MPa. This results in an improvement rate of about 70% of the endurance limit comparatively with the EDM state and of 26% in comparison to the milled state. These rates could be further increased by the application of the wire brushing process to the polished surfaces that reached 75% and 30% comparatively to the EDM and milling states respectively. In this case, a stabilised surface residual stress of about ≈−150 MPa was measured on the specimen surfaces.

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mentioning

confidence: 99%

Effects of finishing processes on the fatigue life improvements of electro-machined surfaces of tool steel

Ghanem¹,

Fredj²,

Sidhom³

et al. 2010

Int J Adv Manuf Technol

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A contribution in EDM simulation field

Tlili

Ghanem²,

Salah³

2015

Int J Adv Manuf Technol

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Comparative analysis and evaluation of thermal models of electro discharge machining

Escobar

Lange

Medellín-Castillo

2016

Int J Adv Manuf Technol

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Prédiction par calcul de la rugosité totale d'une surface usinée par électroérosion

Cited by 3 publications

References 3 publications

Effects of finishing processes on the fatigue life improvements of electro-machined surfaces of tool steel

Effects of finishing processes on the fatigue life improvements of electro-machined surfaces of tool steel

A contribution in EDM simulation field

Comparative analysis and evaluation of thermal models of electro discharge machining

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