Abstract:Intermetallic/ceramic composites with multiple responses are based on L18 orthogonal array with gray relational analysis (GRA). This paper presents a new approach for the optimization of drilling parameters on drilling MoSi 2– SiC composites. Optimal machining parameters can then be determined by the gray relational grade as the performance index. In this study, the sparking parameters namely current (I), pulse on time (t on ), pulse off time (t off ), spark gap and dielectric flushing pressure (P) are optimiz… Show more
“…In this investigation work, it is evident that all the results of the analysis discussed above are in line with those results reported in various literature. 6,15–17,19,23–26 The variation of entry hole diameter with servo feed rate and wire feed rate is illustrated in Figure 10. Similarly, the relationship of servo feed rate and T on time with exit diameter is depicted in Figure 11.…”
Section: Analysis and Interpretation Of Experimental Resultsmentioning
confidence: 99%
“…These results have an overall strong concordance with the previous predictions. 6,15 The variation of hole circularity with servo feed rate and gap voltage is illustrated in Figure 13. Figure 12.Influence of wire feed rate, T on , T off , gap voltage, and servo feed rate on hole circularity and taper.Figure 13.Variation of hole circularity against servo feed rate and gap voltage.…”
Section: Analysis and Interpretation Of Experimental Resultsmentioning
confidence: 99%
“…In another longitudinal study, GRA approach was implemented for optimization of current, pulse-on-time, pulse-off-time, spark gap and flushing pressure, to control their effect on MRR, electrode wear rate, hole circularity, cylindricity, and perpendicularity. 6 The authors have reported that current and pulse-on-time have about 80% influence on all quality characteristics in combination. In another similar study, some input parameters like pulse-on-time, pulse-off-time, peak current, and spark voltage were modeled using Taguchi-coupled GRA approach for optimizing response like MRR and surface roughness (SR) for ballistic grade aluminum alloy.…”
The development in manufacturing has insisted upon the fabrication of microdrilled holes on orthopedic implants, with finished side wall (devoid of cracks and burr), thin recast layer, low taper, and improved circularity at entry and exit of the hole. In this study, therefore, a multiobjective optimization of wire electric discharge machining microdrilling response characteristics is addressed in order to improve the hole quality characteristics and viability of implants. To improve the quality characteristics of the hole, a hybrid statistical analysis is developed based on grey relational analysis and coefficient of variation. It identifies the key process parameters that are responsible for improving the quality of the hole. The parametric study also reveals that wire feed rate and servo feed rate have a striking effect on the quality of the hole. An important implication of this study is that a thin recast layer, improved entry and exit circularity, adequate taper were observed under optimum drilling condition.
“…In this investigation work, it is evident that all the results of the analysis discussed above are in line with those results reported in various literature. 6,15–17,19,23–26 The variation of entry hole diameter with servo feed rate and wire feed rate is illustrated in Figure 10. Similarly, the relationship of servo feed rate and T on time with exit diameter is depicted in Figure 11.…”
Section: Analysis and Interpretation Of Experimental Resultsmentioning
confidence: 99%
“…These results have an overall strong concordance with the previous predictions. 6,15 The variation of hole circularity with servo feed rate and gap voltage is illustrated in Figure 13. Figure 12.Influence of wire feed rate, T on , T off , gap voltage, and servo feed rate on hole circularity and taper.Figure 13.Variation of hole circularity against servo feed rate and gap voltage.…”
Section: Analysis and Interpretation Of Experimental Resultsmentioning
confidence: 99%
“…In another longitudinal study, GRA approach was implemented for optimization of current, pulse-on-time, pulse-off-time, spark gap and flushing pressure, to control their effect on MRR, electrode wear rate, hole circularity, cylindricity, and perpendicularity. 6 The authors have reported that current and pulse-on-time have about 80% influence on all quality characteristics in combination. In another similar study, some input parameters like pulse-on-time, pulse-off-time, peak current, and spark voltage were modeled using Taguchi-coupled GRA approach for optimizing response like MRR and surface roughness (SR) for ballistic grade aluminum alloy.…”
The development in manufacturing has insisted upon the fabrication of microdrilled holes on orthopedic implants, with finished side wall (devoid of cracks and burr), thin recast layer, low taper, and improved circularity at entry and exit of the hole. In this study, therefore, a multiobjective optimization of wire electric discharge machining microdrilling response characteristics is addressed in order to improve the hole quality characteristics and viability of implants. To improve the quality characteristics of the hole, a hybrid statistical analysis is developed based on grey relational analysis and coefficient of variation. It identifies the key process parameters that are responsible for improving the quality of the hole. The parametric study also reveals that wire feed rate and servo feed rate have a striking effect on the quality of the hole. An important implication of this study is that a thin recast layer, improved entry and exit circularity, adequate taper were observed under optimum drilling condition.
“…Drilling EDM works on the same principle as conventional EDM, but constantly rotating round hollow electrode and dielectric flushing through the electrode tube at high pressure (70-100 bar) are the main distinct features between fast hole drilling EDM and other EDM methods. In addition, it is utilized in many industrial applications such as to create cooling holes in turbine blades, injection nozzles, cutting tool coolant holes, plastic mould vent holes and starter holes in wire EDM [14][15][16][17][18]. It is also found that increasing MRR with desired geometry and good dimensional quality is difficult to accomplish during machinability of harder materials [19].…”
In this study, a newly engineered stir-cast LM13 aluminium alloy-based hybrid composite (5 wt% of TiC and 10 wt% of ZrB 2) is used as workpiece and its machinability investigation is carried out using EDM (electric discharge machining) drilling route with copper electrode. During experimentation, the process variables, namely current (I), pulse on-time (T on) and pulse off-time (T off), are varied and the output performance characteristics, viz. material removal rate (MRR), electrode wear rate (EWR) and dimensional accuracy, i.e. overcut (OC), are measured. The series of experiments (20 runs) are formulated through the adoption of response surface methodology (RSM)-based full-factorial central composite design. To recognize the correlation between the process variables and performance characteristics, a mathematical model is developed for each response. Subsequently, adequacy of the proposed models is verified using analysis of variance (ANOVA). Moreover, ANOVA is employed to identify the significantly influencing process parameters over the performance characteristics. From the analysis of results, it is inferred that the current has the most dominant effect on MRR and EWR, whereas OC is highly influenced by T on. Composite desirability function approach of RSM is utilized to find the optimum set of process parameters in order to satisfy the desired multi-performance characteristics (such as maximizing MRR, minimizing EWR and OC) for obtaining effective holes on hybrid LM13-10ZrB 2-5TiC composite. Finally, optimized results are validated with the experimental results to determine the competence of adopted desirability approach.
“…Carr and Ferreira 15 formulated straightness,°atness and cylindricity as the nonlinear problems, which were then changed into a series of linear problems. Selvarajan et al 16 present a new approach using gray relational analysis for optimization of EDM parameters to get improved circularity and cylindricity. Islam and Pramanik 17 investigated the e®ect of turning parameters on improving the circularity of parts.…”
Form error evaluation of manufactured parts is one of the crucial aspects of precision coordinate metrology. With the advent of technology, the noncontact data acquisition techniques are replacing the conventional machines like coordinate measuring machine (CMM). This paper presents an optimization technique to evaluate minimum zone form errors, namely straightness, circularity,°atness and cylindricity using constriction factor-based particle swarm optimization (CFPSO) algorithm. Addition of constriction factor helps in accelerating the convergence property of CFPSO. Initially, a simple minimum zone objective function is formulated mathematically for each form error and then optimized using the proposed CFPSO. Primarily, the results of the proposed method for form error evaluation are compared with the literature results. Furthermore, the data obtained from noncontact 3D scanner is processed and the results of form error evaluation using CFPSO algorithm are compared with Steinbichler's INSPECT PLUS software results. It was found that the results obtained using the proposed CFPSO algorithm are fast and better as compared with other evolutionary techniques like genetic algorithm (GA), previous literatures and software results. Furthermore, to ensure e®ectiveness of the proposed method statistical analysis (t-test) was performed. CFPSO results for large dimension of problem show signi¯cant di®erence in computation time as compared with GA. The CFPSO algorithm provides 27.25%, 7.5% and 6.38% improvements in circularity,°atness and cylindricity, respectively, in comparison to RE software results, for determination of minimum zone error. Thus, the methodology presented helps in improving the accuracy and for speeding up of the automated inspection process generally performed by CMMs in industries.
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