Yazar "Shah, Prassan" seçeneğine göre listele

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    Öğe
    Application of Environmentally-friendly Cooling/Lubrication Strategies for Turning Magnesium/SiC MMCs
    (Springer, 2021) Khanna, Navneet; Shah, Prassan; Suri, Narendra Mohan; Agrawal, Chetan; Khatkar, Sandeep K.; Pusavec, Franci; Sarikaya, Murat
    The material having high strength to weight ratio is constantly in high demand for automotive industries to increase fuel efficiency. With this view, AZ91/5SiC (an Mg-based Particulate Metal Matrix Composites (PMMCs)) is fabricated using an in-house developed stir casting setup and characterized through Field Emission Scanning Electron Microscopy (FESEM) with Energy-Dispersive X-ray Spectroscopy (EDS) analysis. However, the machinability of PMMCs is found to be lower due to the existence of harder ceramic constituents and appropriate cutting fluid strategies are required to follow to combat this situation. But limited studies are available identifying the impact of recently developed sustainable cooling and lubrication techniques on machining performance when PMMCs is turned. To fill this bridge, customized setups of minimum quantity lubrication (MQL), cryogenic and CryoMQL machining with LN(2)have been developed to provide eco-friendly cutting fluid approaches to turn AZ91/5SiC. The cutting force, energy consumption, surface roughness (R-a) and chip breakability index (C-in) have been analyzed for MQL, cryogenic and CryoMQL techniques with variation in process parameters. By considering the average value of all turning tests, 64.65% and 40.39%; and 11.49% and 7.13% higher value of cutting force and energy consumption is found correspondingly for cryogenic and CryoMQL machining respectively as compared to MQL technique respectively. Overall, 25.59% and 18.35% lower values ofR(a)have been observed for CryoMQL technique as compared with MQL and cryogenic machining respectively. The powder type chips with comparable higher values ofC(in)have been found in all three cooling and lubrication techniques.
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    Öğe
    Energy consumption and ecological analysis of sustainable and conventional cutting fluid strategies in machining 15-5 PHSS
    (Elsevier, 2022) Khanna, Navneet; Shah, Prassan; Sarikaya, Murat; Pusavec, Franci
    Recently, the intense exquisite actions taken by Government authorities generate an immediate requirement to develop more energy-efficient and environment-friendly machining processes. It has been realized to emerge a sustainable alternative to conventional carbon-based coolants in machining processes and select optimum process parameters for reducing the harmful impacts on the environment. However, little literature has been identified which compares the various cutting fluid strategies based on energy consumption and LCA analysis for the combination of the same process parameters and material. Especially, the environmental impacts generated due to nano-cutting fluids are still not explored. Therefore, this study presents the analysis of eight different cutting fluid strategies i.e., Dry, Wet, Minimum Quantity Lubrication (MQL), Electrostatic MQL (EMQL), Hybrid Nanoparticles immersed EMQL (HNPEMQL), Electrostatic Lubrication (EL), LCO2, and LN2 in turning application of 15-5 Precipitated Hardened Stainless Steel (PHSS) at nine different combinations of cutting speeds (vc) and feeds (f). As a result, for the dry and HNPEMQL cutting conditions, the highest and lowest energy consumption have been observed correspondingly. Approximately, 5%, 5%, 8%, 4%, 4%, 5%, and 10% correspondingly higher energy consumption have been identified in EMQL, MQL, EL, Wet, LCO2, LN2, and dry cutting condition in comparison with HNPEMQL. However, HNPEQML was come out as the cutting condition having the highest environmental impact.
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    Öğe
    Life cycle assessment of environmentally friendly initiatives for sustainable machining: A short review of current knowledge and a case study
    (Elsevier, 2022) Khanna, Navneet; Wadhwa, Jwalant; Pitroda, Anjali; Shah, Prassan; Schoop, Julius; Sarikaya, Murat
    The establishment of energy and resource-efficient machining processes is key for achieving more sustainable production in the manufacturing industries. However, accomplishing the eco-efficiency goal for machining high strength materials used in the automotive and aerospace industry is challenging, because a trade-off must be achieved between energy consumption and economical productivity. To address this challenge from an ecological perspective, this study focuses on a detailed literature review of Life Cycle Assessment (LCA) analysis made on machining processes considering the comparison of cutting fluid strategies. Along with this, the present study also provides an extensive elucidation regarding the steps required to analyze LCA. Besides, this study aim to analyze LCA analysis in machining processes, and present the case study about macro-level comparative LCA of turning in-house cast AXZ911/10SiC metal matrix composites (MMCs) for three levels of cutting speed (v(c)), longitudinal feed rate (f), and axial depth of cut (a(p)). Each condition was subjected to three different cutting fluid approaches i.e., Dry, Liquid Carbon Dioxide (LCO2), and Liquid Nitrogen (LN2). Streamlined LCA (SLCA) was performed for 18 environmental impact categories using the Ecochain Mobius platform, connected to ReCiPe midpoint (H) and normalized with World (H) method. The findings showed that for all the levels of a(p & nbsp;)and the same cutting strategy, the lower v(c & nbsp;)and lower f result in a higher environmental impact. The comparison of the cutting fluid approach in terms of their correspondent normalized impact score reveals that machining in the cryogenic environment of LN2 with higher v(c) and higher f is the most sustainable and economical approach.
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    Öğe
    Machinability analysis of nickel-based superalloy Nimonic 90: a comparison between wet and LCO2 as a cryogenic coolant
    (Springer London Ltd, 2021) Patel, Tej; Khanna, Navneet; Yadav, Sahitya; Shah, Prassan; Sarikaya, Murat; Singh, Dilpreet; Gupta, Munish Kumar
    The usage of cryogenic fluid is increasing in the machining industries especially to cut the materials having a lower machinability like Nimonic 90, a nickel-based alloy. However, the comparison of flood coolant and LCO2 as a cryogenic fluid based on machining performance has not been found for machining Nimonic 90. In this regard, this study compares LCO2 and conventional mineral oil-based flood coolant on the basis of machining performance while turning Nimonic 90. The effect of turning process parameters (cutting speed (v(c)), feed (f), and depth of cut (a(p))) and cutting fluids has been identified by analyzing machinability indicators like cutting force, flank tool wear, power consumption, surface roughness in terms of R-a, and chip morphology. Increment of 34%, 25%, and 24% in cutting forces has been observed for cryogenic turning using LCO2 in comparison with wet machining when the values of a(p) are 0.75, 0.50, and 0.25 mm, respectively. A decrement of 63% tool wear has been seen in LCO2 cryogenic fluid in contrast to wet machining at higher values of v(c), f, and a(p). The superior surface finish has been found in wet machining, while lesser power consumption was recorded for LCO2 as a cutting fluid. Cryogenic machining provided better chip breakability in comparison with wet machining.