Yazar "Pusavec, Franci" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    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.
  • [ X ]
    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.