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Experimental Investigation and Fuzzy Based Prediction of Titanium Alloy Performance During Drilling Process

Shareef Israa R., Hussein Hiba K., Mahdi Basma Luay

Advances in Science and Technology. Research Journal

2023

Vol. 17, no 6

192--205

Recently, titanium and its alloys have been widely used in industry. Titanium alloys are difficult to machine due to high tool wear, cutting temperature, and edge formation. Thus, this analysis predicts how machining parameters, particularly drilling parameters, affect titanium work piece integrity. This study used Taguchi and fuzzy control software to calculate the effects of cutting parameters and drill tip angle on surface roughness maximal temperature in titanium alloy workpieces during dry drilling. Three 10 mm cutting tools have 106°, 118°, and 130° tip angles. Cutting tools are made of high-speed steel. The work piece model is a parallelogram with 100mm width, 150mm length, and 30mm thickness. Cutting settings include three spindle speeds. (500, 1000, and 1500) rpm with 0.1, 0.2, and 0.3 mm/rev feed rates. All simulations have the same hole depth (4 mm). We also estimated and discussed the rate of temperature change due to cutting settings. This prediction is used to diagnose and improve drilling, increase tool life, and safeguard the work piece. This reduces titanium drilling costs and effort. The machining model's work piece temperature is influenced by spindle speed and tool tip angle, but feed rate has no effect. Drillers can optimise drilling performance and obtain desired results including efficient penetration rates, shortened drilling time, and reduced equipment failure by regulating these parameters. Fuzzy Logic predicts drilling parameters on Titanium workpieces with encouraging results.

Electrode material on machined surface during spark erosion of Ti-6Al-4V (machined at low range parameters)

Thesiya D., Dave J., Rajurkar A.

Advances in Manufacturing Science and Technology

2014

Vol. 38, nr 4

39--51

Investigation of the machining performance of the titanium alloy (Ti-6Al-4V) at low range parameters by the electrical discharge machining (EDM) using copper and graphite as electrodes with positive polarity. The objective of this paper is to investigate the peak current (A), servo voltage (V), on time (Ton), off time (Toff) and show the effects on material removal rate (MRR), electrode wear rate (EWR) and surface roughness (SR). Design of experiments (DOE) method by using Taguchi technique (L18) mixed level implemented. The validity test of the fit and adequacy of the proposed model has been carried out through analysis of variance (ANOVA).SR was set the lower the better to attain the optimum dimensional precision. Experimental results indicate that copper as a tool electrode shows a better surface roughness than a graphite electrode.

W pracy przedstawiono analizę wyników badań obróbki elektroerozyjnej stopu tytanu Ti-6Al-4V w zakresie małej wartości wyładowań elektrycznych z zastosowaniem miedzianej i grafitowej elektrody spolaryzowanej dodatnio. Wyznaczono wpływ parametrów prądowych: natężenia, napięcia, czasu włączenia i wyłączenia na chropowatość powierzchni, prędkość usuwania materiału i zużycie elektrody. W badaniach stosowano zaawansowaną metodę DOE (ang. DOE – Design of Experiments) wyznaczania wpływu zmiennych wejściowych na wynik procesu poddanego analizie. Walidację metody badawczej oraz przyjętego modelu prowadzono z użyciem wariancji ANOVA. Analiza wyników badań potwierdziła, że elektroda miedziana jest lepszym narzędziem do obróbki elektroerozyjnej stopu tytanu.