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    Machinability investigations of hardened steel with biodegradable oil-based MQL spray system
    (Springer London Ltd, 2020) Gupta, Munish Kumar; Mia, Mozammel; Jamil, Muhammad; Singh, Rupinder; Singla, Anil Kumar; Song, Qinghua; Liu, Zhanqiang
    Excessive use of coolant is undesirable in machining due to environmental consciousness; thereby, small but efficacious (improved thermal and tribological properties) amount of coolant has been implemented using minimum quantity lubrication (MQL). In this study, attention was focused on the experimental investigations on tool flank wear, chip morphology, surface roughness (R-a and R-q) and chip-tool interface temperature in the machining of hardened steel (similar to 40 HRC) under olive oil-assisted MQL spray system. As investigating factors, the cutting speed, feed rate, and depth of cut were oriented by following the Taguchi orthogonal array. Then, the cooling and lubrication mechanism of the olive oil-assisted MQL system has been discussed. Outcomes of this study showed that MQL is capable of generating favorable machining outcomes, i.e., lower tool flank wear, reduced temperature, and surface roughness in comparison with dry cutting. The reductions in R-a, R-q, and cutting temperature were about 23.4%, 23.8%, and 24% respectively in terms of mean values. The two types of dominant chip shapes, i.e., (1) continuous tubular and (2) discontinuous small diameter chips, were produced under the dry and MQL-assisted cooling method. In the nutshell, it is appropriate to claim that the overall thermal and tribological properties of olive oil-assisted MQL system are responsible for fruitful results during turning of hardened steel.
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    Öğe
    Tribological behavior of textured tools in sustainable turning of nickel based super alloy
    (Elsevier Sci Ltd, 2021) Gupta, Munish Kumar; Song, Qinghua; Liu, Zhanqiang; Singh, Rupinder; Sarikaya, Murat; Khanna, Navneet
    In this research study, textured tools were fabricated and used for machining under different cooling conditions. The most important uniqueness of the work lies in the use of textured tools for machining Inconel-718 under dry, Nitrogen cooling and nanofluids (hBN mixed with minimum quantity lubrication) conditions. In the turning experiments, two different level of cutting speed i.e., 75 and 125 m/min and a constant level for feed rate (0.1 mm/rev) and depth of cut (0.5 mm) were considered. The above three conditions were tested and compared with and without the use of textured tools. The tool wear, surface roughness, cutting temperature, micro-hardness of machined samples and chip morphology were investigated under these subjected conditions and at turning parameters. The results demonstrated that the nanofluids with textured tool provide the superior results in comparison with other cooling conditions. These results establish textured tools as a sustainable alternative to the existing cutting tool technology being used in the manufacturing industry.