Effect of the addition of silicon carbide powder on themicrocrack generation and on the surface topography in electrical discharge machining of ABNT M2 high speed steel,

by Pereira Rodrigues, Jean Robert

Abstract (Summary)
This work investigates surface topography and microcrack generated by electricaldischarge machining in workpieces of high speed steel (ABNT M2). Three different commercialdielectric fluids are used with and without addition of silicon carbide powder. Electrodes ofelectrolytic copper are used in roughing operations. The microcracks are evaluated using SEManalysis by two parameters: density and length. Surface finishing is measured by the averageroughness parameter (Ra) and surface topography with studied within SEM. In general, thesamples machined with the addition of powder of SiC presented significant improvements in thesurface finishing, compared to samples machined by conventional EDM. It was observed thataddition of SiC powder has no effect in the length of the microcracks. However, it affectedmicrocrack density. The results suggest that the powder penetrates into the gap between thetool and the workpiece, resulting in more uniform and directed sparks.
This document abstract is also available in Portuguese.
Bibliographical Information:

Advisor:Anselmo Eduardo Diniz; Álisson Rocha Machado; Claudionor Cruz; Sinésio Domingues Franco

School:Universidade Federal de Uberlândia

School Location:Brazil

Source Type:Master's Thesis

Keywords:Electrical discharge machining Silícon carbide powder Microcrack generation Surface topography High-speed steel (ABNT M2)


Date of Publication:09/10/1999

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