Between-the-Holes Cryogenic Cooling of the Tool in Hole-Making of Ti-6Al-4V and CFRP

Iqbal, Asif; Zhao, Guolong; Zaini, Juliana; Gupta, Munish Kumar; Jamil, Muhammad; He, Ning; Nauman, Malik Muhammad; Mikołajczyk, Tadeusz; Pimenov, Danil Yurievich

doi:10.3390/ma14040795

Cited by 36 publications

(20 citation statements)

References 24 publications

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“…Ti6Al4V alloy, with the chemical composition and mechanical properties compliant with ISO 5832-3:2016 [45] standard, was examined (Table 1). Ti6Al4V alloy is characterized by high strength-to-weight ratios and has high corrosion resistance; thus, it is used in many industries including medical, automotive, aerospace, and marine [46]. The machining was performed on a CNC lathe CKE6136i (Dalian Machine Tool Group Corporation, Dalian, China) using a turning with a CoroTurn SDJCR 2020K 11 (Sandvik Coromant, Sandviken, Sweden) tool holder and a CoroTurn DCMX 11 T3 04-WM 1115 (Sandvik Coromant, Sandviken, Sweden) insert.…”

Section: Workpiece Details and Preparationmentioning

confidence: 99%

Corrosion Resistance and Surface Bioactivity of Ti6Al4V Alloy after Finish Turning under Ecological Cutting Conditions

et al. 2021

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The influence of cooling conditions and surface topography after finish turning of Ti6Al4V titanium alloy on corrosion resistance and surface bioactivity was analyzed. The samples were machined under dry and minimum quantity lubrication (MQL) conditions to obtain different surface roughness. The surface topographies of the processed samples were assessed and measured using an optical profilometer. The produced samples were subjected to electrochemical impedance spectroscopy (EIS) and corrosion potential tests (Ecorr) in the presence of simulated body fluid (SBF). The surface bioactivity of the samples was assessed on the basis of images from scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) analysis. The inspection of the surfaces of samples after turning under dry and MQL conditions revealed unevenly distributed precipitation of hydroxyapatite compounds (Ca/P) with a molar ratio in the range of 1.73–1.97. Regardless of the cutting conditions and surface roughness, the highest values of Ecorr ~0 mV were recorded on day 7 of immersion in the SBF solution. The impedance characteristics showed that, compared to the MQL conditions, surfaces machined under dry conditions were characterized by greater resistance and the presence of a passive layer on the processed surface. The main novelty of the paper is the study of the effect of ecological machining conditions, namely, dry and MQL cutting on the corrosion resistance and surface bioactivity of Ti6Al4V titanium alloy after finish turning. The obtained research results have practical significance. They can be used by engineers during the development of technological processes for medical devices made of Ti6Al4V alloy to obtain favorable functional properties of these devices.

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Section: Workpiece Details and Preparationmentioning

confidence: 99%

Corrosion Resistance and Surface Bioactivity of Ti6Al4V Alloy after Finish Turning under Ecological Cutting Conditions

et al. 2021

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“…The advantageous of this cooling technique is that it avoided workpiece hardening Fig. 3 Average hole size at the top and bottom of holes in dry and cryogenic conditions caused by direct contact with cryogenic coolant [79]. Therefore, the literature appears to support the fact that the cooling strategy have significant and variable effect on the resulting hole and dimensional tolerances when drilling composites.…”

Section: Hole Size and Circularity Analysismentioning

confidence: 99%

The effect of cryogenic machining of S2 glass fibre composite on the hole form and dimensional tolerances

Köklü

Morkavuk

Featherston

et al. 2021

Int J Adv Manuf Technol

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S2 glass fibre reinforced epoxy composites are widely used in aeronautical applications owing to their excellent strength to weight ratio. Drilling glass fibres can be cumbersome due to their abrasive nature and poor thermal conductivity. Moreover, the use of conventional coolants is not desirable due to contamination and additional costs for cleaning the machine part. An alternative is to use environmentally friendly coolants such as liquid nitrogen (LN2) which have been previously employed in machining metals and composites. The current study investigates the effect of drilling S2 glass fibre composite in a bath of LN2. The study aims to evaluate the effect of spindle speed, feed rate and the presence of cryogenic cooling on the form and dimensional tolerances of the hole (hole size, circularity, cylindricity and perpendicularity). Design of experiments and analysis of variance (ANOVA) were used to determine the contribution of the input parameters on the analysed hole quality metrics. Results indicated that drilling S2 glass fibre in a cryogenic bath increased hole size significantly beyond the nominal hole diameter. The hole circularity and cylindricity were reduced compared to holes drilled under dry condition under all cutting parameters due to enhanced thermal stability during the drilling process. The current study aims to provide the scientific and industrial communities with the necessary knowledge on whether cryogenic bath cooling strategy provides better hole quality output compared to dry drilling and other cryogenic cooling strategies which were previously reported in the open literature.

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“…Xu, J. et al hole quality of CFRP/Ti6Al4V stacks using the TiAlN-coated and diamond-coated drills [ 6 ]. Iqbal, A. et al presents a novel technique of cooling only the twist drill between drilling of holes with no effect of the applied cryogenic coolant transferred to the work material [ 7 ]. Wang, F. presents the cryogenic cooling milling method can improve milling hole effect and restrict machining defects for AFRP [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis and Process Evaluation of Cooling Hole Forming Precision in Mask Assisted Electrochemical Machining Based on GH4169

Dai

2022

Materials

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Good heat dissipation performance of aero-engine an effectively improve the service performance and service life of aero-engine. Therefore, this paper studies the machining method of cooling holes of high-temperature existent material GH 4169 for aero-engine innovatively puts forward the mask electrochemical machining method of cooling holes and explores the entrance morphology and taper formation law of the hole structure of high-temperature resistant material GH 4169. The mathematical model of anode dissolution of cooling holes in ECM is established, and the influence of voltage and electrolyte flow rate on cooling holes in ECM is analyzed. Compared with the mask-less electrochemical machining, the inlet radius of cooling holes in mask electrochemical machining is reduced by about 16.0% and the taper is reduced by 52.8% under the same machining parameters, which indicates that the electrochemical machining efficiency of mask is higher and the machining accuracy is better. Experiments show that the diameter of the mask structure improves the accuracy of the inlet profile of the cooling hole in the ECM. The diameter of the mask increases from 2 mm to 2.8 mm, and the inlet radius of the cooling hole increased from 1.257 mm to 1.451 mm When the diameter of the mask is 2.2 mm, the taper of the cooling hole decreased by 53.4%. The improvement effect is best, and the thickness of the mask has little influence on the forming accuracy of the cooling hole.

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Between-the-Holes Cryogenic Cooling of the Tool in Hole-Making of Ti-6Al-4V and CFRP

Cited by 36 publications

References 24 publications

Corrosion Resistance and Surface Bioactivity of Ti6Al4V Alloy after Finish Turning under Ecological Cutting Conditions

Corrosion Resistance and Surface Bioactivity of Ti6Al4V Alloy after Finish Turning under Ecological Cutting Conditions

The effect of cryogenic machining of S2 glass fibre composite on the hole form and dimensional tolerances

Simulation Analysis and Process Evaluation of Cooling Hole Forming Precision in Mask Assisted Electrochemical Machining Based on GH4169

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