Improving surface integrity when drilling CFRPs and Ti-6Al-4V using sustainable lubricated liquid carbon dioxide

RODRIGUEZ, Iñigo; Arrazola, P.J.; Cuesta, Mikel; Sterle, Luka; Pušavec, Franci

doi:10.1016/j.cja.2022.09.004

Cited by 13 publications

(4 citation statements)

References 42 publications

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“…The experiment involved manipulating two key process parameters: the feed rate and the chosen machining conditions. Speci cally, three distinct feed rate levels (0.05, 0.083, and 0.1 mm/rev) and three different cutting conditions (dry, ood, and minimum quantity lubrication -MQL) were employed, as detailed in references [22][23][24][25]. In the case of the ood approach, HD68 straight oil was utilized as the cutting uid, with a uid ow rate of 7.5 liters/minute.…”

Section: Methodsmentioning

confidence: 99%

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Investigating Drilling Efficiency: A Study on Indexable Centerless Drilling of Ti-6Al-4V Alloy

Zahoor,

Ehsan,

Raza

et al. 2024

Preprint

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Titanium Alloy (Ti-6Al-4V), is highly regarded in the aerospace industry due to its exceptional strength-to-weight ratio. The alloy's low thermal conductivity and high tensile strength pose machining challenges, leading to increased tool temperatures and mechanical stress. The conventional use of solid carbide drills is hindered by substantial tool wear. To improve tool life, prior research has delved into various cutting strategies, ranging from flood cooling to minimum quantity lubrication (MQL), enduring challenges persist. This study introduces an innovative approach, leveraging Titanium Aluminum Nitride (TiAlN) coated indexable centerless inserts to bore holes in Ti-6Al-4V under three distinct cutting conditions: dry, flood cooling, and MQL. These conditions are scrutinized across varied feed rates (60 mm/min, 100 mm/min, and 120 mm/min) with a fixed spindle speed of 1200 rpm. The study's primary focus is on key output parameters, including surface roughness (SR), tool life, and cutting temperature. From the parametric and surface topographic analysis, the findings reveal that under the flood cutting approach with a 60 mm/min feed rate, the indexable inserts excelled when drilling Ti-6Al-4V. This combination delivered a better surface quality (Ra = 1.66 µm), extended tool life (27814.27 mm3 material removed and 18 holes drilled), and lower cutting temperature (881°F). Additionally, scanning electron microscopy (SEM) analysis corroborates that most common types of wear observed were abrasion, delamination, cracking, and edge fracture.

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Section: Methodsmentioning

confidence: 99%

“…In a separate study, researchers have successfully reduced burr height by employing cryogenic oil, while the use of boron oilbased MQL has shown promise in improving the surface quality of holes [22]. Furthermore, the integration of MQL with MoS4 has proven effective in enhancing surface integrity, irrespective of the tool's geometry [23].…”

Section: Introductionmentioning

confidence: 99%

Investigating Drilling Efficiency: A Study on Indexable Centerless Drilling of Ti-6Al-4V Alloy

Zahoor,

Ehsan,

Raza

et al. 2024

Preprint

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“…A significant part of studies on the drilling process of titanium alloys is devoted to the dependence evaluation of the roughness geometric parameters of drilled holes on the cutting process conditions, particularly the drill feed and cutting speed [29,30]. Considerable attention is also paid to the analysis of microhardness of cutting machined subsurface layers of titanium alloys during drilling [31,32], the influence of various lubricating and cooling fluids and methods of their supply to the cutting zone on the formation of surface integrity characteristics [33], the analysis of the influence of special geometrical parameters of drills on surface integrity [34], and others.…”

Section: Mechanical Characteristics Determination Of Drilled Subsurfa...mentioning

confidence: 99%

Interaction of Mechanical Characteristics in Workpiece Subsurface Layers with Drilling Process Energy Characteristics

Storchak,

Hlembotska,

Melnyk

et al. 2024

Metals

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The performance properties of various types of parts are predominantly determined by the subsurface layer forming methods of these parts. In this regard, cutting processes, which are the final stage in the manufacturing process of these parts and, of course, their subsurface layers, play a critical role in the formation of the performance properties of these parts. Such cutting processes undoubtedly include the drilling process, the effect of which on the mechanical characteristics of the drill holes subsurface layers is evaluated in this study. This effect was evaluated by analyzing the coincidence of the energy characteristics of the short hole drilling process with the mechanical characteristics of the drilled holes’ subsurface layers. The energy characteristics of the short-hole drilling process were the total drilling power and the cutting work in the tertiary cutting zone, which is predominantly responsible for the generation of mechanical characteristics in the subsurface layers. As mechanical characteristics of the drill holes’ subsurface layers were used, the microhardness of machined surfaces and total indenter penetration work determined by the instrumented nanoindentation method, as well as maximal indenter penetration depth, were determined by the sclerometry method. Through an analysis of the coincidence between the energy characteristics of the drilling process and the mechanical characteristics of the subsurface layers, patterns of the effect of drilling process modes, drill feed, and cutting speed, which essentially determine these energy characteristics, on the studied mechanical characteristics have been established. At the same time, the increase in the energy characteristics of the short-hole drilling process leads to a decrease in the total indenter penetration work and the maximum indenter penetration depth simultaneously with an increase in the microhardness of the drilled holes’ subsurface layers.

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“…TC 4 -Ti (Ti 6 Al 4 V) alloys have been widely used in the aerospace field due to their high specific strength and good thermal stability [1,2]. However, Ti alloys have the disadvantages of low surface hardness, poor high-temperature oxidation resistance, a high friction coefficient, and easy adhesion wear, which limit their commercial application [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Surface Performance of Nano-CrN/TiN Multi-Layered Coating on the Surface of Ti Alloy

Feng,

Shi,

Zhao

et al. 2023

Materials

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Surface coating has been widely used to ameliorate the surface properties of Ti alloys. In this study, high-power pulsed magnetically controlled sputtering technology was used to successfully prepare a nano-CrN/TiN multi-layered coating on the surface of a TC4 Ti alloy. The surface of the obtained coating was uniform, dense, and free of obvious defects. With the decrease in modulation period, the optimal growth of the nano-CrN/TiN multi-layered coating was changed from a (220) crystal surface to (111) and a (200) crystal surface. Compared to the single-layered CrN or TiN coating, the nano-multi-layered coating had higher hardness and lower wear rate. Furthermore, the hardness and the wear resistance increased with the decrease in the modulation period. This presented an optimal modulation period of 6 nm. Meanwhile, the resistance of the obtained coating to high-temperature oxidation at 800 °C was also significantly improved.

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Improving surface integrity when drilling CFRPs and Ti-6Al-4V using sustainable lubricated liquid carbon dioxide

Cited by 13 publications

References 42 publications

Investigating Drilling Efficiency: A Study on Indexable Centerless Drilling of Ti-6Al-4V Alloy

Investigating Drilling Efficiency: A Study on Indexable Centerless Drilling of Ti-6Al-4V Alloy

Interaction of Mechanical Characteristics in Workpiece Subsurface Layers with Drilling Process Energy Characteristics

Surface Performance of Nano-CrN/TiN Multi-Layered Coating on the Surface of Ti Alloy

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