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Machinability analysis of thin-walled carbon fiber reinforced ceramic composites based on wire electrical discharge machining

100%

Poroś D. , Wiśniewska M.

Zeszyty Naukowe Politechniki Morskiej w Szczecinie

2024

tom nr 77 (149)

5--13

We propose employing wire electrical discharge machining (WEDM) for shaping thin-walled, multidirectional, carbon fiber reinforced silicon carbide (Cf-SiC) composite parts. Ceramic matrix composite Cf-SiC combines the outstanding mechanical properties of the carbon fiber with oxidation, abrasive wear, corrosion resistance, and high strength at the high temperature of the silicon carbide matrix. The impact of time-related electrical discharge machining parameters (pulse ON-time and break OFF-time) on the material removal rate and surface roughness are analyzed. The material removal rate of the Cf-SiC is proved to be 36% lower than that for machined steel grade 55. The high thermal stresses and interaction of the composite accompanying WEDM are also discussed. Furthermore, an alternative mechanism to the WEDM of metals has been investigated and confirmed by a scanning electron microscopy (SEM) analysis. The morphology of the machined Cf-SiC surface demonstrates the dominance of the carbon fibers’ fracture mechanism, both the transverse and longitudinal forms, with interphase detachment over craters and micro-cracks, pitting, and spalling on the SiC matrix. Satisfactory roughness indicators (Sa = 2 µm) are obtained in 3D topography measurements of the Cf-SiC surfaces. Concluding, the WEDM should be considered a good alternative to Cf-SiC abrasive machining when cutting holes, grooves, keyways, splines, and other complex shapes.

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

80%

Karolczak P. , Poroś D. , Kowalski M.

Mechanik

2019

tom R. 92, nr 10

655--657

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

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.