“…Thus, Cryogenic and Minimum Quantity Lubrication conditions are the promising solutions to overcome the drawbacks of dry and flooded machining. S Joshi et al 9 developed a new approach to predict the delamination factor for dry and cryogenic drilling of carbon-fiber-reinforced polymer (CFRP) in terms of cutting speed and feed rate on thrust force, delamination, and surface roughness. The results of this article showed that drilling under cryogenic conditions exhibited a significant improvement on the surface quality compared to dry cutting.…”
The work in this study presents an experimental evaluation on minimum quantity cooling lubrication based on the Ranque–Hilsch vortex tube and minimum quantity lubrication performance in hard drilling of Hardox 500 steel (49–50 HRC) using coated carbide drills. Al2O3 nanoparticles are suspended in the based fluids including water-based emulsion and rice bran oil to enhance the cooling and lubricating effects. The response variables, consisting of drilling thrust force, surface roughness, surface profile and microstructure, and tool wear, are studied, and the analysis of variance is used for evaluating the input machining parameters under minimum quantity lubrication and minimum quantity cooling lubrication conditions. The results of this article indicate that minimum quantity cooling lubrication using Al2O3 nanofluid provides the better machining performance and gives out better surface quality and lower thrust force compared to minimum quantity lubrication with/without nanofluid and minimum quantity cooling lubrication with pure fluid. Also, based on the optimization results, the validation experiments are conducted to study more on drilling thrust force, chip morphology, and tool wear.
“…Thus, Cryogenic and Minimum Quantity Lubrication conditions are the promising solutions to overcome the drawbacks of dry and flooded machining. S Joshi et al 9 developed a new approach to predict the delamination factor for dry and cryogenic drilling of carbon-fiber-reinforced polymer (CFRP) in terms of cutting speed and feed rate on thrust force, delamination, and surface roughness. The results of this article showed that drilling under cryogenic conditions exhibited a significant improvement on the surface quality compared to dry cutting.…”
The work in this study presents an experimental evaluation on minimum quantity cooling lubrication based on the Ranque–Hilsch vortex tube and minimum quantity lubrication performance in hard drilling of Hardox 500 steel (49–50 HRC) using coated carbide drills. Al2O3 nanoparticles are suspended in the based fluids including water-based emulsion and rice bran oil to enhance the cooling and lubricating effects. The response variables, consisting of drilling thrust force, surface roughness, surface profile and microstructure, and tool wear, are studied, and the analysis of variance is used for evaluating the input machining parameters under minimum quantity lubrication and minimum quantity cooling lubrication conditions. The results of this article indicate that minimum quantity cooling lubrication using Al2O3 nanofluid provides the better machining performance and gives out better surface quality and lower thrust force compared to minimum quantity lubrication with/without nanofluid and minimum quantity cooling lubrication with pure fluid. Also, based on the optimization results, the validation experiments are conducted to study more on drilling thrust force, chip morphology, and tool wear.
“…Different authors have been demonstrated the importance of the proper selection of drill geometry and cutting parameters in order to diminish machining induced damage [17][18][19][20]. Delamination is the most common defect induced during machining [21][22][23][24] Different techniques have been used for delamination [25] measurement, ranging from the use of optical microscopy and the use of image processing techniques [26,27] to the use of thermographic and ultrasonic techniques [28,29].…”
Biocomposites are promising materials for traditional composites replacement in specific applications due to their interesting properties and sustainability. Although the composite components are manufactured near net shape, some machining operations, commonly drilling, are commonly required prior to mechanical joining of the components. Tool geometry, mainly the point angle of the drill, strongly affects the performance of the drilling process of composites in terms of machining induced damage.The aim of this work is analyzing the influence of the point angle of the drill on the damage generated during drilling of 100% biodegradable composite, using both numerical and experimental approaches. The novelty of the work relies on the lack of studies of drilling 100% biodegradable composites. The influence of the point angle on the thrust forces and hence in the machining induced damage was demonstrated.
“…43,51 Joshi et al. 52 indicated that cutting speed did not have a prominent effect on the thrust force. Figure 6.The effects of cutting speed and BN nanoparticles on thrust force in drilling process of CFEC and CFEn-C. BN: boron nitride; CFEn-C: carbon fiber epoxy nanocomposite.…”
Section: Resultsmentioning
confidence: 99%
“…A number of researchers have stated that thrust force decreases with the increase of cutting speed, 44,46,50 while others have increased. 43,51 Joshi et al 52 indicated that cutting speed did not have a prominent effect on the thrust force.…”
Section: Resultsmentioning
confidence: 99%
“…The relation between surface roughness and feed rate is clear and as feed rate is increased, surface roughness also increases, as seen in Figure 10. 52,60,61 However, the effect of BN on the variation of surface roughness is obviously seen on the nanocomposites. It can be illustrated that surface roughness is decreased in nanocomposite at following all feed rates.…”
The reinforcements of nanoparticles have an important role in improving the machinability of nanocomposite materials. Except for the known nanoparticles such as carbon nanotube, graphene, nanoclay, etc., the effect of boron nitride reinforcement on the machinability of composite materials are a recent research topic. In this study, boron nitride nanoparticle was introduced to the matrix resin that brings about additional strength and enhancement in thermal and mechanical properties of the composite. Though it was confirmed that this composition enhances the focused properties, it is necessary to investigate drilling performance of these composite and identify the effects of this boron nitride nanoparticle on machinability of carbon fiber epoxy nanocomposite considering thrust force, delamination factor, etc. Accordingly, while the thrust force is increased by reinforcement of the boron nitride nanoparticles, on the contrary of literature, delamination factor is tend to reduce as compared with reference composite. This experimental study shows the addition of boron nitride nanoparticles help to reduce delamination factor of carbon fiber epoxy nanocomposite. In addition, hole surfaces and drilling mechanism analyzed with optical and scanning electron microscope about damage estimation.
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