The Experts below are selected from a list of 609 Experts worldwide ranked by ideXlab platform
Zhijian Pei - One of the best experts on this subject based on the ideXlab platform.
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Rotary ultrasonic Machining: effects of tool natural frequency on ultrasonic vibration amplitude
Machining Science and Technology, 2019Co-Authors: Palamandadige Fernando, Meng Zhang, Zhijian PeiAbstract:Rotary ultrasonic Machining (RUM) is a Hybrid Machining Process that combines the material removal mechanisms of grinding and ultrasonic Machining. RUM has been applied to hole-making for a wide ra...
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Experimental investigations on core drilling by ultrasonic-vibration-assisted grinding for hard-to-machine materials - a review
International Journal of Manufacturing Research, 2016Co-Authors: Na Qin, Jingwen Lei, Zhijian PeiAbstract:Ultrasonic-vibration-assisted grinding (UVAG), a Hybrid Machining Process combining material removal mechanisms of diamond grinding and ultrasonic Machining, has been used to machine various hard-to-machine materials. Large amount of research work on UVAG has been carried out since it is invented. However there are few review papers to cover the current literature on UVAG. The emphasis of this literature review is the experimental investigations of the drilling Process with ultrasonic vibration using a core drill with metal-bonded diamond abrasives. Experimental results are summarised and compared. The inconsistent results and their reasons are discussed. Furthermore, directions of future research on UVAG are also presented. [Received 2 April 2015; Revised 30 November 2015; Accepted 2 December 2015]
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Support Vector Fuzzy Adaptive Network in the Modeling of Material Removal Rate in Rotary Ultrasonic Machining
Journal of Manufacturing Science and Engineering, 2008Co-Authors: Judong Shen, Zhijian Pei, E. S. LeeAbstract:Rotary ultrasonic Machining (RUM) is one of the cost-effective Machining methods for Machining difficult to Process material. It is a Hybrid Machining Process that combines the material removal mechanisms of diamond grinding with ultrasonic Machining. However, due to the lack of understanding of the mechanisms of these operations, models for these Machining Processes are difficult to establish. In this paper, the support vector fuzzy adaptive network (SVFAN), a parameter free nonlinear regression technique, is used to model the material removal rate in RUM. The SVFAN retains the advantages of both the fuzzy adaptive networks and the support vector machines. The former possesses the linguistic representation ability and the latter is a very effective learning machine. The results are compared with that obtained by the use of fuzzy adaptive network and it is shown that the combined approach is a more effective algorithm for the modeling of complex manufacturing Processes.
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Rotary Ultrasonic Machining of Advanced Ceramics
Materials Science Forum, 2006Co-Authors: Wei Min Zeng, Zhijian PeiAbstract:Rotary ultrasonic Machining (RUM) is one of the cost-effective Machining methods for advanced ceramics, which is a Hybrid Machining Process that combines the material removal mechanisms of diamond grinding and ultrasonic Machining (USM). This paper presents an overview of the investigations on RUM of advanced ceramics. The issues about the material removal mechanisms, Process modeling, material removal rate, and tool wear in RUM are reviewed. Directions of future research on RUM are also presented.
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Development of an innovative coolant system for rotary ultrasonic Machining
International Journal of Manufacturing Technology and Management, 2005Co-Authors: Yue Jiao, Zhijian Pei, Timothy W. Deines, C. TreadwellAbstract:Rotary ultrasonic Machining (RUM), a Hybrid Machining Process combining the material removal mechanisms of diamond grinding and ultrasonic Machining, has been recognised as a reliable and cost-effective Machining method for hard-to-machine materials such as advanced ceramics. There exist a number of articles on this Process, but no one has reported systematic studies on coolant effects. In this paper, the air-operated double diaphragm pump is used for the first time in rotary ultrasonic Machining to develop a novel coolant system to study the coolant effect on RUM performances, including vertical cutting force, material removal rate and surface roughness. Experiments with different coolant delivery modes are conducted and the material removal Process in rotary ultrasonic Machining when employing the new coolant system is discussed.
Vinod Yadava - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation on electrical discharge diamond drilling of nickel-based superalloy aerospace material:
Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2015Co-Authors: Umacharn Singh Yadav, Vinod YadavaAbstract:In this article, the authors have attempted to use altogether a new Hybrid Machining Process for making the holes in nickel-based superalloy (nimonic alloy) aerospace material and termed it as electro-discharge diamond drilling Process. To perform this experimental study, they self-designed and developed a setup which is capable to hold as well as rotate the metal-bonded diamond abrasive tool electrode. They installed this setup on a ZNC 320 sinking electrical discharge Machining machine and conducted the experimental study. The effects of input parameters such as gap current, pulse-on time, duty factor and tool rotation on the response parameters such as average surface roughness (Ra) and average circularity (Ca) of the drilled hole have been studied. It is observed that electro-discharge diamond drilling Process has substantive effects on the improvement of Ra as well as on Ca in comparison to the hole made by stationary electrode electrical discharge Machining (die-sinking electrical discharge machinin...
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Modeling and Simulation of Cylindrical Electrochemical Magnetic Abrasive Machining Process
Machining Science and Technology, 2014Co-Authors: K. B. Judal, Vinod YadavaAbstract:Cylindrical Electrochemical Magnetic Abrasive Machining (C-EMAM) is an advanced abrasion-based Hybrid Machining Process that constitutes magnetic abrasive Machining and electrochemical dissolution. During the C-EMAM Process, a large amount of material is removed from the peaks of the surface irregularities under the simultaneous effect of electrochemical dissolution, abrasion and abrasion-passivation synergism. This article presents the mathematical modeling for material removal and surface roughness during the C-EMAM Process. Magnetic potential distribution between the two magnetic poles in which a cylindrical workpiece was placed was calculated using the finite element method. It was further used to find the forces acting on the ferromagnetic particles at contact surfaces. An empirical relation has been also developed considering the effect of electrochemical dissolution and abrasion-passivation synergism based on experiments conducted on a self-developed C-EMAM setup. Finally, a surface roughness model...
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Slotted-electrical discharge diamond cut-off grinding of Al/SiC/B_4C Hybrid metal matrix composite
Journal of Mechanical Science and Technology, 2014Co-Authors: Ravindra Nath Yadav, Vinod YadavaAbstract:Advanced manufacturing industries need materials with high strength and low weight in the fields of advanced engineering, such as automobiles 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 simultaneously leads 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 intervals due to the rotation of a slotted abrasive grinding wheel. The performance of the Hybrid Process was tested on an Al/SiC_p/B_4C_p work-piece in cut-off grinding mode. The experiments were conducted on an electrical discharge Machining machine, which consists of a separate attachment on a vertical column to rotate the wheel. Pulse current, pulse on-time, pulse off-time, wheel RPM, and abrasive grit number were 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 current ranging 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 to be 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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Multi-objective optimization of Process parameters in Electro-Discharge Diamond Face Grinding based on ANN-NSGA-II Hybrid technique
Frontiers of Mechanical Engineering, 2013Co-Authors: Ravindra Nath Yadav, Vinod Yadava, Gyanendra Kumar SinghAbstract:The effective study of Hybrid Machining Processes (HMPs), in terms of modeling and optimization has always been a challenge to the researchers. The combined approach of Artificial Neural Network (ANN) and Non-Dominated Sorting Genetic Algorithm-II (NSGA-II) has attracted attention of researchers for modeling and optimization of the complex Machining Processes. In this paper, a Hybrid Machining Process of Electrical Discharge Face Grinding (EDFG) and Diamond Face Grinding (DFG) named as Electrical Discharge Diamond face Grinding (EDDFG) have been studied using a Hybrid methodology of ANN-NSGA-II. In this study, ANN has been used for modeling while NSGA-II is used to optimize the control parameters of the EDDFG Process. For observations of input-output relations, the experiments were conducted on a self developed face grinding setup, which is attached with the ram of EDM machine. During experimentation, the wheel speed, pulse current, pulse on-time and duty factor are taken as input parameters while output parameters are material removal rate (MRR) and average surface roughness ( R _a). The results have shown that the developed ANN model is capable to predict the output responses within the acceptable limit for a given set of input parameters. It has also been found that Hybrid approach of ANN-NSGAII gives a set of optimal solutions for getting appropriate value of outputs with multiple objectives.
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A study of electrochemical magnetic abrasive Machining Process
International Journal of Manufacturing Technology and Management, 2013Co-Authors: K. B. Judal, Vinod YadavaAbstract:This paper presents the study of Hybrid Machining Process consisting of electrochemical dissolution and magnetic abrasive Machining. Experiments were conducted on self-developed cylindrical electrochemical magnetic abrasive Machining (C-EMAM) setup to explore the finishing results of the Process on non-magnetic stainless steel using unbonded magnetic abrasives. The effect of electrolytic current, magnetic flux density and rotational speed of workpiece on material removal and surface roughness were investigated. It was observed that the rotational speed of the workpiece, magnetic flux density and electrolytic current should be properly fitted to achieve passivation-abrasion synergism. The problems associated with the Process, which reduces the performance are also discussed.
C. Treadwell - One of the best experts on this subject based on the ideXlab platform.
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Development of an innovative coolant system for rotary ultrasonic Machining
International Journal of Manufacturing Technology and Management, 2005Co-Authors: Yue Jiao, Zhijian Pei, Timothy W. Deines, C. TreadwellAbstract:Rotary ultrasonic Machining (RUM), a Hybrid Machining Process combining the material removal mechanisms of diamond grinding and ultrasonic Machining, has been recognised as a reliable and cost-effective Machining method for hard-to-machine materials such as advanced ceramics. There exist a number of articles on this Process, but no one has reported systematic studies on coolant effects. In this paper, the air-operated double diaphragm pump is used for the first time in rotary ultrasonic Machining to develop a novel coolant system to study the coolant effect on RUM performances, including vertical cutting force, material removal rate and surface roughness. Experiments with different coolant delivery modes are conducted and the material removal Process in rotary ultrasonic Machining when employing the new coolant system is discussed.
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modeling of material removal rate in rotary ultrasonic Machining designed experiments
Journal of Materials Processing Technology, 2002Co-Authors: P Hu, J M Zhang, C. TreadwellAbstract:Abstract Advanced ceramic materials have many potential engineering applications. However, their widespread applications have been hindered by the high Machining cost. There is a critical need for cost-effective Machining Processes for advanced ceramics. Rotary ultrasonic Machining (RUM) is a Hybrid Machining Process that combines the material removal mechanisms of diamond grinding and ultrasonic Machining (USM), resulting in higher material removal rates (MRR) than those obtained by either diamond grinding or USM. An approach to modeling the MRR during RUM of ceramics has been proposed and applied to predicting the MRR for the case of magnesia stabilized zirconia. Relationships between MRR and the controllable Machining parameters have been deduced. These relationships agreed well with the trends observed by experimental observations made by other investigators. However, the relationships have been studied by changing one variable at a time. Therefore, the interactions between these variables have not been revealed. In this paper a five-factor two-level factorial design is used to study the relationships between MRR and the controllable Machining parameters. This study will provide the main effects of these variables, and two-factor interactions and three-factor interactions among these variables. The results will shed more light on the material removal mechanism in RUM. The comparison with experimental results will also serve as further validation of the model.
Gopal Agarwal - One of the best experts on this subject based on the ideXlab platform.
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Influence of Dielectric Jet Flushing during Electro Discharge Diamond Surface Grinding Process
Advanced Materials Research, 2013Co-Authors: Gopal Agarwal, Manoj ModiAbstract:The influence of dielectric jet flushing during Electro Discharge Diamond Surface Grinding (EDDSG) on Ti-6A-4V has been reported in this paper. The metal bonded diamond grinding wheel is used as electrode in Electro Discharge Diamond Surface Grinding Process. In this Process mechanical grinding is coupled with electrical spark of electrical discharge machine to take up the advantages associated with Hybrid Machining Process. The important input parameters in this investigation were “duty factor”, “wheel speed (rpm)”, “magnitude of current (ampere)” and its “duration (Ton, micro-second)”. The effects of these parameters on outcomes i.e. material removal rate (MRR) and surface roughness (Ra) are measured. The noticeable enhancements in material removal rate and surface finish have been seen during EDDSG of Ti-6Al-4V with effective jet flushing. The performance of EDDSG with jet flushing and without jet flushing has been compared.
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Optimization of Electro-Discharge Diamond Surface Grinding Process Parameters with Multiple Performance Characteristics of Ti-6Al-4V Using Grey-Taguchi Approach
Advanced Materials Research, 2012Co-Authors: Manoj Modi, Gopal AgarwalAbstract:The present paper reports the optimization of Process parameters in Hybrid Machining Process (Electro-Discharge Diamond Surface Grinding) of Ti-6Al-4V with multiple performance characteristics using the combination of Grey Relational Analysis (GRA) and Taguchi approach. The various input Process parameters in this work are wheel speed (RPM), duty factor, current (ampere) and pulse on-time (µs). In this research work nine experiments have been conducted according to the Taguchi’s L9 orthogonal array on in-house-designed & fabricated EDDSG set-up. The Machining parameters wheel speed (S), duty factor (DF), current (I) and pulse on-time (Ton) are optimized with consideration of multiple performance characteristics such as material removal rate (MRR) and average surface roughness (Ra). The confirmation experimental results show that combined Grey-Taguchi approach enhances the Machining performance in EDDSG of Ti-6Al-4V.
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Design, Development & Experimental Investigation of Electro-Discharge Diamond Surface Grinding of Ti-6Al-4V
Advanced Materials Research, 2011Co-Authors: Manoj Modi, Gopal AgarwalAbstract:Abstract: Ti-6Al-4V are used extensively in aerospace, medical, marine and surgical implants etc. but it is hard to machine. Machining of advanced difficult-to-machine very hard materials (Ti-6Al-4V, composites and ceramics) is a big challenge. By conventional Machining Processes, their Machining is not only costly but results in poor surface finish and shorter tool life. To meet these challenges, new Hybrid Machining Process (HMP) has been developed. This article is focused on Hybrid Machining Process comprising of conventional surface grinding along with electro-discharge Machining between the periphery of metal bonded diamond grinding wheel and flat rectangular shape workpiece. This Process has the advantage of shaping advance engineering materials and difficult-to- machine very hard materials. The experimental investigations of various input parameters like wheel RPM, duty factor, current and pulse on-time on material removal rate of Ti-6Al-4V in EDDSG Process have been reported here on newly self designed & fabricated set up. Keywords: Electro-Discharge Diamond Surface Grinding (EDDSG), Hybrid Machining Process (HMP), Ti-6Al-4V.
Manoj Modi - One of the best experts on this subject based on the ideXlab platform.
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Influence of Dielectric Jet Flushing during Electro Discharge Diamond Surface Grinding Process
Advanced Materials Research, 2013Co-Authors: Gopal Agarwal, Manoj ModiAbstract:The influence of dielectric jet flushing during Electro Discharge Diamond Surface Grinding (EDDSG) on Ti-6A-4V has been reported in this paper. The metal bonded diamond grinding wheel is used as electrode in Electro Discharge Diamond Surface Grinding Process. In this Process mechanical grinding is coupled with electrical spark of electrical discharge machine to take up the advantages associated with Hybrid Machining Process. The important input parameters in this investigation were “duty factor”, “wheel speed (rpm)”, “magnitude of current (ampere)” and its “duration (Ton, micro-second)”. The effects of these parameters on outcomes i.e. material removal rate (MRR) and surface roughness (Ra) are measured. The noticeable enhancements in material removal rate and surface finish have been seen during EDDSG of Ti-6Al-4V with effective jet flushing. The performance of EDDSG with jet flushing and without jet flushing has been compared.
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Optimization of Electro-Discharge Diamond Surface Grinding Process Parameters with Multiple Performance Characteristics of Ti-6Al-4V Using Grey-Taguchi Approach
Advanced Materials Research, 2012Co-Authors: Manoj Modi, Gopal AgarwalAbstract:The present paper reports the optimization of Process parameters in Hybrid Machining Process (Electro-Discharge Diamond Surface Grinding) of Ti-6Al-4V with multiple performance characteristics using the combination of Grey Relational Analysis (GRA) and Taguchi approach. The various input Process parameters in this work are wheel speed (RPM), duty factor, current (ampere) and pulse on-time (µs). In this research work nine experiments have been conducted according to the Taguchi’s L9 orthogonal array on in-house-designed & fabricated EDDSG set-up. The Machining parameters wheel speed (S), duty factor (DF), current (I) and pulse on-time (Ton) are optimized with consideration of multiple performance characteristics such as material removal rate (MRR) and average surface roughness (Ra). The confirmation experimental results show that combined Grey-Taguchi approach enhances the Machining performance in EDDSG of Ti-6Al-4V.
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Design, Development & Experimental Investigation of Electro-Discharge Diamond Surface Grinding of Ti-6Al-4V
Advanced Materials Research, 2011Co-Authors: Manoj Modi, Gopal AgarwalAbstract:Abstract: Ti-6Al-4V are used extensively in aerospace, medical, marine and surgical implants etc. but it is hard to machine. Machining of advanced difficult-to-machine very hard materials (Ti-6Al-4V, composites and ceramics) is a big challenge. By conventional Machining Processes, their Machining is not only costly but results in poor surface finish and shorter tool life. To meet these challenges, new Hybrid Machining Process (HMP) has been developed. This article is focused on Hybrid Machining Process comprising of conventional surface grinding along with electro-discharge Machining between the periphery of metal bonded diamond grinding wheel and flat rectangular shape workpiece. This Process has the advantage of shaping advance engineering materials and difficult-to- machine very hard materials. The experimental investigations of various input parameters like wheel RPM, duty factor, current and pulse on-time on material removal rate of Ti-6Al-4V in EDDSG Process have been reported here on newly self designed & fabricated set up. Keywords: Electro-Discharge Diamond Surface Grinding (EDDSG), Hybrid Machining Process (HMP), Ti-6Al-4V.
