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RISS 인기검색어
- 검색키워드
- 저자 : Manu Dogra (검색결과 3 건)
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Tool Wear, Chip formation and Workpiece surface issues in CBN Hard Turning: A Review
Manu Dogra,Vishal S Sharma,Anish Sachdeva,Narinder Mohan Suri,Jasminder Singh Dureja4 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.
Steel parts that carry critical loads in everything from automotive drive trains and jet engines to industrial bearings and metal-forming machinery are normally produced by a series of processes, including time-consuming and costly grinding and polishing operations. Due to the advent of super-hard materials such as polycrystalline cubic boron nitride (PCBN) cutting tools and improved machine tool designs, hard turning has become an attractive alternative to grinding for steel parts. The potential of hard turning to eliminate the costs associated with additional finishing processes in conventional machining is appealing to industry. The objective of this paper,is to survey the recent research progress in hard turning with CBN tools in regard of tool wear, surface issues and chip formation. A significant pool of CBN turning studies has been surveyed in an attempt to achieve better understanding of tool wear, chip formation, surface finish, white layer formation, micro-hardness variation and residual stress on the basis of varying CBN content, binder, tool edge geometry, cooling methods and cutting parameters. Further important modeling techniques based on finite element, soft computing and other mathematical approaches used in CBN turning are reviewed. In conclusion, a summary of the CBN turning and modeling techniques is outlined and the scope of future work is presented.
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Environment Friendly Machining of Inconel 625 under Nano-Fluid Minimum Quantity Lubrication (NMQL)
Talwinder Singh,Jasminder Singh Dureja4,Manu Dogra,Manpreet S. Bhatti 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.11
Superalloy Inconel 625 although having many industrial applications owing to its high strength, exhibits poor machinability because of its sticky nature and poor heat conductivity. To improve its machinability, use of cutting fluids becomes necessary to remove heat and provide lubrication in the cutting region. However, harmful effects of cutting fluids on environment and operator health restrict their application. Several efforts have been carried out to replace or minimize the quantity of conventional cutting fluids used in machining to strive for green machining and economizing machining operations. Nano-fluid minimum quantity lubrication (NMQL) technique has evolved as best alternative to flood conditions cooling / lubrication especially for machining of alloys like Inconel. This paper experimentally investigates the suitability of NMQL (carbon nanotube; CNT in vegetable oil) in machining of Inconel 625. The objective was to minimize tool wear and surface roughness under different machining conditions. Tool performance in NMQL was also compared with that under dry and flood conditions. The results revealed superiority of NMQL in terms of better tool life and improved surface finish over dry machining and nearly equivalent performance to wet (flood) machining thus provides the way forward for sustainable and environmental friendly machining.
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J. S. Dureja,Ranjit Singh,Talwinder Singh,Pargat Singh,Manu Dogra,Manpreet S. Bhatti 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.2 No.2
The benefits of cutting fluids in machining are well known, but their use is accompanied by health and environment hazards. Moreover, strict environmental regulations make the manufacturers to switch over to dry turning, which is not feasible during machining of sticky material like stainless steel and Inconel etc. Therefore, the use of minimal quantities of lubricant (MQL) can be regarded as an alternative solution and a step towards green machining. In the present investigation an attempt has been made to explore the potential of MQL turning of stainless steel with coated carbide cutting tool. Turning under MQL conditions has shown superior results (in terms of flank wear and machined surface roughness) over wet and dry turning. Signal to noise (S/N) ratio as per Taguchi design revealed speed and MQL as significant parameters for minimizing flank wear and surface roughness, whereas feed can be set within range. The optimum combination of parameters are cutting speed (58 m/min), feed rate (0.06 mm/rev.) and MQL flow rate (100 mL/h) for flank wear and cutting speed (23 m/min), feed rate (0.07 mm/rev.) and MQL flow rate (150 mL/h) for surface roughness. Taguchi optimized conditions were validated through multiple response optimization using desirability function.
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