The Effect of Machining Parameters on Weight Removal in Chemical Machining of Titanium Alloy

Abstract

Chemical machining (CHM) processes are one of the non-conventional machining processes the material removal occurs when the machined part contact with a strong chemical etchant solution. This study aiming to study the influences of machining time, machining temperature and the concentration of the used etchant solution on the weight removal of chemically machined titanium alloy, in this study two different etchant concentration of mixture acids consist of hydrofluoric acid (HF)  mixed with nitric acid (HNO3) in specific quantities are used, the first etchant concentration consist of (9 vol.% HF , 14 VOL.% HNO3 in 77 vol.% distilled water) the second concentration (12 vol.% HF, 16 vol.% HNO3 in 72 vol.% distilled water) to chemically machine eight specimens of (30 x 10 x 1) mm size by using four level of machining time (4, 6, 8 and 10) min and four level of machining temperature (35, 40, 45 and 50)  for both concentrations as a machining conditions. The results show that the weight removal increased with the increasing of the time, temperature and the concentration of the used etchant