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RISS 인기검색어
- 검색키워드
- 저자 : Ravindra Nath Yadav (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Ravindra Nath Yadav,Vinod Yadava,G. K. Singh 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
Hybrid machining processes (HMPs), having potential for machining of difficult to machine materials but the complexity and highmanufacturing cost, always need to optimize the process parameters. Our objective was to optimize the process parameters of electricaldischarge diamond face grinding (EDDFG), considering the simultaneous effect of wheel speed, pulse current, pulse on-time and dutyfactor on material removal rate (MRR) and average surface roughness (Ra). The experiments were performed on a high speed steel(HSS) workpiece at a self developed face grinding setup on an EDM machine. All the experimental results were used to develop themathematical model using response surface methodology (RSM). The developed model was used to generate the initial population for agenetic algorithm (GA) during optimization, non-dominated sorting genetic algorithm (NSGA-II) was used to optimize the process parametersof EDDFG process. Finally, optimal solutions obtained from pareto front are presented and compared with experimental data.
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Slotted-electrical discharge diamond cut-off grinding of Al/SiC/B4C hybrid metal matrix composite
Ravindra Nath Yadav,Vinod Yadava 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1
Advanced manufacturing industries need materials with high strength and low weight in the fields of advanced engineering, such asautomobiles and aeronautics. Metal matrix composites (MMCs) are one of the advanced engineering materials that meet the above requirements. To enhance the properties of MMCs, researchers added an additional phase of reinforcements into single reinforced MMCs,such developed MMCs are known as hybrid MMCs. The additional phase of reinforcements enhances the properties of MMCs, but simultaneouslyleads to rapid tool wear and poor machinability. This study developed an innovative hybrid machining process (HMP)consisting of electrical discharge grinding and diamond grinding in such a way that both the processes occur alternately with equal intervalsdue to the rotation of a slotted abrasive grinding wheel. The performance of the hybrid process was tested on an Al/SiCp/B4Cp workpiecein cut-off grinding mode. The experiments were conducted on an electrical discharge machining machine, which consists of a separateattachment on a vertical column to rotate the wheel. Pulse current, pulse on-time, pulse off-time, wheel RPM, and abrasive grit numberwere taken as input parameters while material removal rate (MRR) and average surface roughness were taken as output parameters. Result were shown that the HMP gives higher MRR with better surface finish as compared to the constituent processes. Pulse currentranging from 3 A to 21 A, pulse on-time ranging from 30 μs to 200 μs, and pulse off-time ranging from 15 μs to 90 μs were also found tobe more suitable for higher MRR, and a wheel RPM at 1300 RPM was more suitable for higher MRR with better surface finish.
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Experimental Study of Erosion and Abrasion based Hybrid Machining of Hybrid Metal Matrix Composite
Ravindra Nath Yadav,Vinod Yadava 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
Machining of metal matrix composites (MMCs) are still a challenge for manufacturing industries. Among various machining processes, electrical discharge machining (EDM) and diamond grinding (DG) are more acceptable processes for machining of the MMCs. In this paper, a new compound wheel (CW) is developed in such a way that both processes (EDM and DG) occur in alternate way due to the rotation of wheel. The performance of erosion and abrasion based hybrid machining (EAHM)process has been tested on hybrid aluminium-silicon carbide-graphite (Al/SiC/Gr) composite in terms of material removal rate (MRR) and average surface roughened (Ra). The experiments have been conducted on EDM machine with application of CW for effective spark erosion and abrasive abrasion machining. The effects of pulse current, pulse duration, pulse interval and wheel speed on MRR and Ra has been experimentally investigated and discussed.
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