Drilling of CFRP-Ti6Al4V stacks using CO2-cryogenic cooling

Rodríguez, Adrián; Calleja, A.; Lacalle, Luis Norberto López de; Pereira, Octavio; Rubio-Mateos, Antonio; Rodríguez, Gabriel Peña

doi:10.1016/j.jmapro.2021.01.018

Cited by 64 publications

(19 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, when drilling under dry conditions, it is expected that cutting temperature will rise both the cutting tool and the workpiece leading to the expansion of the lamina; however, composites such as CFRP and GFRP have tendency to spring-back leading to shrinkage of drilled holes closer to their nominal diameter [74]. The current results disagree with previous studies [63,[75][76][77][78] on drilling CFRP and GFRP laminates using through tool cryogenic cooling which both reported reduced hole size when using cryogenic cooling compared to dry drilling. This could be attributed to the cooling strategy (i.e., cryogenic bath vs cryogenic through tool cooling) in which the later provides efficient cooling in terms of controlled coolant quantity and localisation on the hole cutting region and cutting tool.…”

Section: Hole Size and Circularity Analysiscontrasting

confidence: 93%

“…Another reason for increased hole size using cryogenic bath creates an extremely low temperature environment for both the cutting tool and the workpiece which restricts the rise of cutting temperatures and prevents possible thermal expansions of both tool and workpiece, i.e., cutting occurs at − 196°C or close to it. This was confirmed by Rodríguez et al [77] which reported that under dry drilling, the temperature measured at the tool tip can be more than ten times higher than that when using cryogenic cooling. In addition, drilling at very low temperatures, the composite becomes more brittle which causes a substantial increase in cutting forces, thereby increasing the probability oversized holes [80].…”

Section: Hole Size and Circularity Analysissupporting

confidence: 62%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Section: Hole Size and Circularity Analysiscontrasting

confidence: 93%

Section: Hole Size and Circularity Analysissupporting

confidence: 62%

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

View full text Add to dashboard Cite

show abstract

“…The drilling process was performed on a vertical manual milling machine using spindle speeds of 1000, 2000, and 3000 rpm and feed rates of 0.04, 0.08, and 0.14 mm/rev. All the experiments were conducted without the use of coolants because dry conditions are considered an eco-friendlier process [24,25]. The tools selected were uncoated carbide drill bits.…”

Section: Methodsmentioning

confidence: 99%

“…In the machining process, chips can adhere to the cutting tool to form BUE, resulting in deterioration of the cutting tool [41]. Additionally, according to Rodríguez et al [24], during dry drilling operations there are chances of both high friction phenomena and chemical diffusion, which cause adhesion, burn marks, and flank wear. Therefore, the higher formation of BUE in drilling affects the hole quality.…”

Section: Chip Analysis and Tool Conditionmentioning

confidence: 99%

Effect of Cutting Parameters and Tool Geometry on the Performance Analysis of One-Shot Drilling Process of AA2024-T3

Aamir

Giasin

Tolouei‐Rad

et al. 2021

Metals

View full text Add to dashboard Cite

Drilling is an important machining process in various manufacturing industries. High-quality holes are possible with the proper selection of tools and cutting parameters. This study investigates the effect of spindle speed, feed rate, and drill diameter on the generated thrust force, the formation of chips, post-machining tool condition, and hole quality. The hole surface defects and the top and bottom edge conditions were also investigated using scan electron microscopy. The drilling tests were carried out on AA2024-T3 alloy under a dry drilling environment using 6 and 10 mm uncoated carbide tools. Analysis of Variance was employed to further evaluate the influence of the input parameters on the analysed outputs. The results show that the thrust force was highly influenced by feed rate and drill size. The high spindle speed resulted in higher surface roughness, while the increase in the feed rate produced more burrs around the edges of the holes. Additionally, the burrs formed at the exit side of holes were larger than those formed at the entry side. The high drill size resulted in greater chip thickness and an increased built-up edge on the cutting tools.

show abstract

“…The effect of cutting heat was much smaller under the CryoMQL technique than that of the dry condition [9]. A. Rodríguez et al [10] applied liquefied CO 2 for the drilling process of CFRP-Ti6Al4V. The authors concluded that the cutting temperature significantly decreased, hole surface quality improved, and tool life was much prolonged compared with the dry condition.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Nanoparticle Concentration and Cutting Parameters on Surface Roughness in MQL Hard Turning Using MoS2 Nanofluid

Tuấn

Ngoc

Thu

et al. 2021

Fluids

View full text Add to dashboard Cite

Minimum quantity lubrication (MQL) has gained significant attention in various research fields and industrial applications for its advantages of being environmentally friendly and suitable for sustainable production. The effectiveness of MQL is increasing significantly by using nano cutting fluid, which can be produced by suspending nanoparticles in the based cutting fluid. This study aims to investigate the effects of MoS2 nanoparticle concentration, cutting speed, and feed rate on MQL hard turning of 90CrSi steel in terms of surface roughness and surface microstructure. The Box–Behnken experimental design was used to analyze the influence of input parameters and their interaction effects as well as to find the optimal set of variables. The obtained results prove the improvement of the machinability of carbide tools due to higher cooling and lubricating performance created by MoS2 nanofluid MQL, which contributes to improve the surface quality and reduce the manufacturing cost. There is an interaction effect between nanoparticle concentration and feed rate which has a strong influence on surface roughness.

show abstract

Drilling of CFRP-Ti6Al4V stacks using CO2-cryogenic cooling

Cited by 64 publications

References 28 publications

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

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

Effect of Cutting Parameters and Tool Geometry on the Performance Analysis of One-Shot Drilling Process of AA2024-T3

Investigation of the Effects of Nanoparticle Concentration and Cutting Parameters on Surface Roughness in MQL Hard Turning Using MoS2 Nanofluid

Contact Info

Product

Resources

About