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Comparative Analysis of Different WEDM Strategies Applied to Cut WC-Co Cemented Carbides

Poroś Dariusz

Advances in Science and Technology. Research Journal

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2021

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Vol. 15, no 4

126--135

EN

Cemented carbides WC-Co feature high mechanical properties and outstanding wear resistance. Traditional grinding of such hard workpiece features low material removal rate and diminished tool life. Notwithstanding that, even if, proper cooling fluid is applied; abrasive machining of cemented carbides characterizes poor efficiency. The aim of this study was to investigate the issue of WEDM of the cemented carbides WC-Co with two alternative materials of the wire electrodes applied. The presented experimental surface layer geometry measurements was carried out on a modern profilometer MITUTOYO SV 3200. Especially, WEDM results with wire flushing and in immersion were compared. Investigated were the effects of such input parameters as the pulse width and the time between two pulses on the output parameters such as area cutting efficiency, workpiece surface roughness in 2D and 3D. Analysing SEM microphotographs the surface layer defects after WEDM, cobalt depletion and pitting was discoursed. The analysed results provided WEDM of WC-Co cemented carbides with molybdenum wire electrode as seventy one percent less efficient and higher roughness was obtained for the same number of passes. The lowest height of the roughness on the surface after cutting with molybdenum wire amounted to Ra and Sa = 3.5 μm. Such roughness involves a 25 μm deep undesirable heat affected zone. WEDM with equal number of passes and brass wire resulted in roughness Ra and Sa =0,9 μm. In further research, an endeavour should be directed to examine different water and hydrocarbons derivative dielectrics impact on the surface layer structure and chemical composition of the machined WC-Co carbides.

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Heat affected zone analysis of Ti6Al4V after WEDM

Poroś Dariusz, Zaborski Stanisław, Karolczak Paweł

Mechanik

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2019

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R. 92, nr 12

833--835

EN

Perspectives of applications WEDM for cutting titanium alloys are presented. There is space to explore how application of proper time parameters and the material of wire electrode for WEDM of titanium alloys affects the surface roughness, structure, the stress and the chemical composition of the formed surface layer.

PL

Przedstawiono problematykę obróbki elektroerozyjnej tytanu z uwzględnieniem doboru parametrów czasowych oraz materiału elektrody drutowej. Podjęto także temat analizy geometrii obrobionej powierzchni i strefy wpływu ciepła.

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Analysis of selected effects of the conventional and unconventional machining of titanium alloys

Karolczak Paweł, Poroś Dariusz, Kowalski Maciej

Mechanik

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2019

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R. 92, nr 10

655--657

EN

In this article, the results of wire WEDM (wire electrical discharge machining) of Ti6Al4V are collated by turning with modified wiper tool geometry. The electrode is CuZn37 brass wire with a diameter of 0.25 mm The analysis of 3D geometry of the Ti6Al4V alloy surface after wiper and WEDM cutting is presented. The possibilities and limitations of wiper and WEDM machining of titanium alloys were indicated

PL

W artykule zestawiono wyniki obróbki Ti6Al4V poprzez toczenie płytką o zmodyfikowanej geometrii typu wiper z wynikami obróbki WEDM (wire electrical discharge machining) za pomocą elektrody mosiężnej CuZn37 o średnicy 0,25 mm. Przenalizowano geometrię 3D powierzchni stopu Ti6Al4V po obróbce płytkami wiper oraz po obróbce elektroerozyjnej. Wskazano na możliwości i ograniczenia obróbki płytkami wiper oraz WEDM stopów tytanu.