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| 1 | Simultaneous optimization of multiple performance characteristics in WEDM for machining ZC63/SiC_p MMC显示文摘The compliance of an integrated approach, principal component analysis(PCA),coupled with Taguchi's robust theory for simultaneous optimization of correlated multiple responses of wire electrical discharge machining(WEDM) process for machining SiC_P reinforced ZC63 metal matrix composites(MMCs) is investigated in this work.The WEDM is proven better for its efficiency to machine MMCs among others,while the particulate size and volume percentage of SiC_p with the composite are the utmost important factors.These improve the mechanical properties enormously,however reduce the machining performance.Hence the WEDM experiments are conducted by varying the particulate size,volume fraction,pulse-on time,pulse-off time and wire tension.In the view of quality cut,the most important performance indicators of WEDM as surface roughness(R_a),metal removal rate(MRR),wire wear ratio(WWR),kerf(K_w) and white layer thickness(WLT) are measured as responses.PCA is used as multi-response optimization technique to derive the composite principal component(CPC) which acts as the overall quality index in the process.Consequently, Taguchi's S/N ratio analysis is applied to optimize the CPC. The derived optimal process responses are confirmed by the experimental validation tests results.The analysis of variance is conducted to find the effects of choosing process variables on the overall quality of the machined component. The practical possibility of the derived optimal process conditions is also presented using SEM. | Thella Babu Rao A.Gopala Krishna | 2013 | Advances in Manufacturing2013，1，3： | 3 |
| 2 | Modeling and multi-response optimization of machining performance while turning hardened steel with self-propelled rotary tool显示文摘There are many advanced tooling approaches in metal cutting to enhance the cutting tool performance for machining hard-to-cut materials.The self propelled rotary tool(SPRT) is one of the novel approaches to improve the cutting tool performance by providing cutting edge in the form of a disk,which rotates about its principal axis and provides a rest period for the cutting edge to cool and allow engaging a fresh cutting edge with the work piece.This paper aimed to present the cutting performance of SPRT while turning hardened EN24 steel and optimize the machining conditions.Surface roughness(R_a) and metal removal rate(r_(MMR)) are considered as machining performance parameters to evaluate,while the horizontal inclination angle of the SPRT,depth of cut,feed rate and spindle speed are considered as process variables.Initially,design of experiments(DOEs) is employed to minimize the number of experiments.For each set of chosen process variables,the machining experiments are conducted on computer numerical control(CNC) lathe to measure the machining responses.Then,the response surface methodology(RSM) is used to establish quantitative relationships for the output responses in terms of the input variables.Analysis of variance(ANOVA) is used to check the adequacy of the model.The influence of input variables on the output responses is also determined.Consequently,these models are formulated as a multi-response optimization problem to minimize the R_a and maximize the r_(MMR)simultaneously.Non-dominated sorting genetic algorithmII(NSGA-II) is used to derive the set of Pareto-optimal solutions.The optimal results obtained through the proposed methodology are also compared with the results of validation experimental runs and good correlation is found between them. | Thella Babu Rao A.Gopala Krishna Ramesh Kumar Katta Konjeti Rama Krishna | 2015 | Advances in Manufacturing2015，3，1： | 2 |
| 3 | An Improved Process for Selective Liquid-Phase Air Oxidation of Toluene显示文摘 | Mannepalli Lakshmi Kantam Pentlavalli Sreekanth Kottapalli Koteswara Rao Thella Prathap Kumar Bhavnari Purna C. Rao Boyapati Manoranjan Choudary | 2002 | Catalysis Letters2002，，3： | 1 |
| 4 | Optimizing machining parameters of wire-EDM process to cut Al7075/SiCp composites using an integrated statistical approach显示文摘 | Thella Babu Rao | 2016 | Advances in Manufacturing2016，4，3： | 0 |
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