Yazar "Srinivasan, D." seçeneğine göre listele

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    Carbon emissions and overall sustainability assessment in eco-friendly machining of Monel-400 alloy
    (Elsevier, 2023) Ross, Nimel Sworna; Rai, Ritu; Ananth, M. B. J.; Srinivasan, D.; Ganesh, M.; Gupta, Munish Kumar; Korkmaz, Mehmet Erdi
    With increasing regulations about global warming, environmental pollution, and climate change, reducing carbon emissions from energy-intensive industrial activities routes to sustainable production. Because of its robust thermo-physical qualities at elevated temperatures, Monel 400 alloy is a renowned material for employment in modern aviation, medical tools, and prosthetic parts. Though, its structural stability imparts its low thermal conductivity that causes heat accumulation at the tool-workpiece contact during machining, resulting in tool cutting-edge damage. Many bio-based cutting fluids have been already tried to curtail heat generation and environmental footprints to progress overall machinability. In this endeavor, the effectiveness of dry, minimum quantity lubrication (MQL), cryogenic carbon dioxide (CO2) and Nano based MQL (N-MQL) are evaluated in terms of important sustainability indicator Carbon emission (CE). Multi-walled carbon Nano-tubes (MWCNT) in MQL oil limit the friction at the contact region which in turn reduces the power consumption. The highest CE value was found under a dry (0.0051 Kg-CO2) cutting environment and the lowest with N-MQL (0.0014 Kg-CO2). The sustainability assessment was done for CE with the help of Machine learning (ML) tech-niques like Decision tree (DT), Naive Bayes, Random Forest (RF), and Support Vector Machine (SVM). Finally, when the CE levels are discretized while considering industrial needs, SVM paired with the Synthetic Minority Over-sampling approach (SMOTE) demonstrated an accuracy of almost around 100%.
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    Role of sustainable cooling/lubrication conditions in improving the tribological and machining characteristics of Monel-400 alloy
    (Elsevier Sci Ltd, 2022) Ross, Nimel Sworna; Ganesh, M.; Srinivasan, D.; Gupta, Munish Kumar; Korkmaz, Mehmet Erdi; Krolczyk, J. B.
    Due to its strong corrosion resistance, high hardness, and ability to maintain its strength at high temperatures, Monel-400 is utilized in the marine, aerospace, and power plant sectors. Monel-400 alloy is hard to machine owing to quick tool wear that causes poor dimensional accuracy. Therefore, an advanced measurement system is required to monitor the insight of machining performance of difficult-to-machine alloys like Monel-400. In the present work, a new cutting technique is presented to increase the efficiency of cryogenic carbon dioxide (CO2) and minimum quantity lubrication (MQL) in the high-performance machining of Monel-400. The combination of both CO2 + MQL (CMQL) is an efficient approach that is supplied to the rake side and compared with dry, CO2 and MQL. Tool wear, surface roughness, temperature, chip morphology and microhardness measurements were performed to enumerate the influence of distinct cutting environments. Based on the findings of the systematic trials, CMQL was found to be the finest effective cooling technique, reducing friction to the greatest possible extent and creating the best possible surface. Under CMQL condition, the flank wear reduction was found to be 51-55 %, 37-47 % and 26-33 % compared to dry, MQL and CO2 conditions, respectively. Even though CMQL effectively reduces friction, the cryo medium outperformed and increased the machined face hardness.