Tel Erozyon Yöntemiyle İşlenmiş Ti 6Al 4V Alaşımının Yüzey Kalitesinin Manyetik Aşındırıcılarla İşleme Yöntemiyle İyileştirilmesi

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.