Improvement of Surface Quality of W-EDMed Ti 6Al 4V Alloy by Magnetic Abrasive Finishing


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Gürün H., Çaydaş U., Çelik M.

Fırat Üniversitesi Mühendislik Bilimleri Dergisi, vol.33, no.1, pp.347-357, 2021 (Peer-Reviewed Journal)

Abstract

Wire electro discharge machining method is an unconventional manufacturing method used in the machining of Ti

6Al 4V alloy, which is in the group of materials that are difficult to machine. Undesirable formations such as cracks, recast

layers and craters that affect the mechanical properties of the material occur on the surface of the material machined in the

method. A second finishing process is required to eliminate these formations and improve both the mechanical properties and

the surface quality. In this study, the surface qualities of the specimens made of Ti 6Al 4V alloy machined with wire electro

discharge method under constant machining conditions were increased by magnetic abrasive finishing method. In the study,

the effects of machining time, abrasive size, number of cycles and magnetic field parameters on process performance were

investigated with the experimental design of Taguchi L9 orthogonal array. After machining with magnetic abrasives, surface

roughness improvement rates (SRIR) and material removal rates (MRR) were determined. Scanning electron microscopy

(SEM) images of the specimens were taken and surface properties and recast layer structures were examined. As a result of the

study, it was determined that the MRR values decreased with the increase of the processing time; increase with the increase of

abrasive size, the rotation number and the magnetic field, SRIR values were measured as 92% on average and this result

increased up to 96% with appropriate processing conditions. It has been determined that the amount of residual layer has been

completely removed in all experiments.