A Review of Milling of Gamma Titanium Aluminides

Castellanos, S. D.; Alves, Jorge Lino

doi:10.24840/2183-6493_003.002_0001

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…Although some research can be found in the literature regarding the experimental and analytical evaluation of traditional machining processes such as turning [15], drilling [16], and milling [17] on titanium aluminides, the number of studies is quite low in comparison to other titanium alloys, so further efforts are needed to find the best cutting conditions. Most of the studies completed on turning conclude the need to perform the process with low cutting speeds, avoiding thermal increase and rapid deterioration of the tool [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Minimum Quantity of Lubricant on Carbide Tools and Surface Integrity in the Machining of Titanium Aluminides

García-Martínez,

Miguel,

Martínez-Martínez

2024

Metals

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Titanium aluminides are being explored as potential materials for the aeronautical sector. However, their application is limited by the high costs of processing and their difficulties in machining. This research evaluates the effectiveness of the minimum quantity lubrication technique (MQL) on the turning process of Ti48Al2Cr2Nb aluminide in terms of tool wear, tool life, cutting forces, surface integrity, and temperature. It was found that MQL conditions can improve the process efficiency, reducing the thermally induced wear mechanisms and enlarging the tool life compared to dry machining. Furthermore, it allows the cutting speed to be incremented, leading to lower processing times. However, MQL seems to not be effective in the reduction of the strain-hardening effect near the machined surface and, although the number of microcracks is reduced, defect-free surfaces cannot be obtained. Moreover, similar microstructural alterations as for dry cutting were detected. The best cutting conditions in terms of surface quality were assessed using the central composite face (CCF) design and surface response methodology. Optimization of the surface roughness under industrially viable cutting conditions was achieved with an average surface roughness value, Ra, of 0.29 µm (feed rate of 0.05 mm/rev, a cutting speed of 54.6 m/min and a depth of cut of 0.125 mm).

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Section: Introductionmentioning

confidence: 99%

Effect of Minimum Quantity of Lubricant on Carbide Tools and Surface Integrity in the Machining of Titanium Aluminides

García-Martínez,

Miguel,

Martínez-Martínez

2024

Metals

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“…However, the difficulty of carrying out the machining processes is seriously limiting the industrial applicability of these materials. Titanium aluminides are classified as difficult-to-cut materials, with a much more complex machinability than other conventional titanium alloys [9]. Due to their mechanical properties, high chemical affinity with most cutting tool materials and high coefficients of friction, extreme temperatures are generated during the cutting, leading to accelerated wear of the inserts and rapid tool failure, together with surface damage of the machined parts [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Machining-Induced Chatter and Part Quality in TiAl Alloys Turning Processes by Means of Harmonics Analysis

García-Martínez,

Miguel,

Manjabacas

et al. 2023

KEM

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Titanium alloys have been reported as potential materials for aeronautical and automotive applications due to their interesting mechanical properties, combined with their low density. The manufacturing processes developed for these alloys require finishing machining operations to improve the surface quality of the parts and to meet the desired geometrical tolerances. Nevertheless, titanium aluminides exhibit extremely low machinability in comparison to traditional titanium alloys. The combination of the low thermal diffusivity of these materials and the high chemical affinity and friction coefficient with the cutting tools accelerate tool wear phenomena and lead to a deterioration of the part surface quality. Moreover, the mechanical properties of titanium aluminides contribute to increase the cutting forces which generates tool repulsion resulting in undesirable vibration or chatter phenomena. In this paper, the machining suitability of the turning process of Ti48Al2Cr2Nb titanium aluminide has been evaluated based on the analysis of chatter phenomena and the inspection of the surface roughness and roundness tolerance of the machined part. Experimental turning tests have been carried out by varying the main parameters of the process, cutting speed, feed rate and tool geometry, with the objective of determining the best cutting combination. For this purpose, a harmonic analysis methodology of the roundness profile based on the application of the discrete Fourier transform (DFT) has been employed. This technique has made it possible to isolate the vibration-induced machining effects from the lower frequency defects generated by part bending and to relate them to the surface quality and geometrical accuracy of the machined part.

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Harmonic-based-on analysis to discriminate different mechanical actions involved in the machining of hard-to-cut materials

García-Martínez,

Molina-Yagüe,

Miguel

et al. 2024

Int J Adv Manuf Technol

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A Review of Milling of Gamma Titanium Aluminides

Cited by 4 publications

References 21 publications

Effect of Minimum Quantity of Lubricant on Carbide Tools and Surface Integrity in the Machining of Titanium Aluminides

Effect of Minimum Quantity of Lubricant on Carbide Tools and Surface Integrity in the Machining of Titanium Aluminides

Evaluation of Machining-Induced Chatter and Part Quality in TiAl Alloys Turning Processes by Means of Harmonics Analysis

Harmonic-based-on analysis to discriminate different mechanical actions involved in the machining of hard-to-cut materials

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