Papers by Keyword: Taguchi Method

Abstract: In this study, the controlled input parameters namely welding speed and spindle speed were optimized by Taguchi method for reinforcement of copper particulates in aluminium alloy (AA6061-AA6063-T6). High carbon and high chromium steel i.e. tool steel D2 type material is used as a friction stir welding tool. Subsequently, the effects of the process parameters were investigated. The signal-to-noise ratios and analysis of variance were applied for statistical analysis. The outcome shows welding speed is the significant parameter than spindle speed. Under the optimum process parameters, 1400 rpm with 16 mm/min were shown best values such as 61.60 MPa for ultimate tensile strength and 91 hardness values. It means moderate spindle speed and lower welding speed develop higher heat. Subsequently, it is also shown that the feasibility of signal-to-noise ratio is responsible to improve welding quality after reinforcement.

Abstract: In this study wear behavior of metal matrix nanocomposites covers a distinctive mixture of Al 7075 reinforced through Titanium Carbide (TiC) and Graphene in nanoform. Present work consists of Al7075 base metal is reinforced with nanopowder TiC (2.5 % wt.) and Graphene (0.25% wt.). The samples casted by ultrasonic stir casting technique and machining in accordance with ASTM standards, then tested for wear behavioral characteristics using pin on disc. This method was functional to determine the effect of three factors like sliding velocity, applied load and sliding distance for the above work by using the Taguchi method. By considering three factors, three levels, and the composition of nanoTiC (2.5%) by keeping a constant Graphene (0.25% wt.), the applied load variations in steps are 10 N, 20 N, and 30 N, the sliding velocity is 1.5m/sec, 2.5m/sec, and 3.5 m/sec, and the sliding distances 500m, 1000m, and 1500 m to study the wear behavior.

Abstract: The formability of sheet-metal with a folding-bottom circular hollow tube has been studied both by numerical simulation and experiment. A mesh-convergence analysis has been carried out to determine an optimum element size for purposes of numerical simulation. The geometry and dimension of the dies and of the punch are designed to simulate the multi-stage deep drawing operation to take place. During the deep drawing operation, the strains of the sheet blank are always located in the second quadrant of the forming limit diagrams, and it continuously moves in a linear state to the left side of the diagram. At the final stage, the tube is drawn to a certain height without evidence of fracture. In order to obtain a quality product, an optimization of input parameters for the deep drawing operation is conducted using Taguchi method. Finally, a validation test is also employed to demonstrate the accuracy of forming processes. The result reveals sufficient agreement in both geometry and dimension between simulated and actual tubes to meet a good quality standard.

Abstract: In this research, the thickness of coating layer and hardness of coated 316L stainless steel surface has been improved by Quench Polish Quench (QPQ) coating process. The influences of nitriding Temperature(T), nitriding time(t_c), and Oxidation time(t_o) on hardness and thickness of coated surface have also been investigated using Taguchi method. During this process, the percentage of carbonate and cyanate, post oxidation temperature, and time are constantly maintained. The experimental investigations have been performed using the Taguchi analysis to examine the effects and to predict the combination of optimum processing time settings. The nitriding time and temperature are significantly contributed to the hardness and maximizing the thickness respectively. The level-3 of all process parameters has been recommended to maximize the hardness (800 Hv) and layer thickness (19.6 µm). The microstructure of the Layer thickness on the coated stainless-steel surface has been illustrated using a Scanning Electron Microscope (SEM) image.

Abstract: Transport industry plays a vital role in development of economy of countries. To increase the load carrying capacity of the truck, the weight of truck bed may be reduced using fibre reinforced composite material. In this work, a numerical investigation is performed to reduce the weight of the truck bed using different types of laminated composites. An extensive study is conducted using unidirectional and woven fibres of glass, carbon and Kevlar fibres with polyester, epoxy and vinyl ester resins. Carbon fibre laminated plates have higher stiffness than Glass and Kevlar composite plates. Asymmetrically hybrid composite plates have lower stiffness than symmetrically hybrid composite plates. It is observed that the stiffness of plate is increased when kevlar unidirectional fibres are arranged at top and bottom of the laminate. [K/G_w]_S hybrid composite plates has the lowest deflection than other five hybrid composite plates. An optimization study is performed to identify the influencing parameter for deflection of the composite materials among material type, fibre volumetric fraction and the thickness of plate using Taguchi method. The results revealed that thickness of the plate has more influential than other two parameters.

Abstract: The current research paper was focused on investigating the influence of wire electrical discharge machining parameters on machining responses of AA-6082/MoS₂/Al₂O₃ Hybrid Metal Matrix Composites (HMMCs). In this paper, Taguchi L₁₈ (2^1 ×3^4) orthogonal array was adopted to conduct the experiments. From the experimental investigations, it was observed that the electrode wire type, pulse on time, and pulse off time have shown a remarkable effect on the machining responses. Keywords: Al-MMC, AA-6082, Stir casting, MRR, Taguchi method

Abstract: Agricultural product processing technology, especially fruit and vegetable drying technology, has been researched and applied to preserve food. For dragon fruit, vacuum drying technology is being applied to process chips that meet the quality requirements. However, the flow of steam from the lower layers sticking to the upper layers in the drying chamber not only reduces the quality uniformity between the product layers but also increases the drying time. Therefore, in this study, the vacuum drying system integrated with the moisture-dissipating walls was proposed. Moreover, the research also applied the Taguchi method to optimize the drying parameters for moisture content of dried products.

Abstract: This work confers to the preparation of Magnesium metal matrix composites reinforced with Lanthanum Hexa-aluminate nanoparticles by a stir casting technique and the tribological characteristics of the composites in dry condition were investigated. A Comparison is also made with AZ91E magnesium alloy and the prepared composites for the assessment of wear behavior. A design of experiments based on the Taguchi technique is used to collect data in a controlled manner. A L25 orthogonal array is used to investigate the effect of wear parameters such as Percentage of Reinforcement, Sliding Speed, Applied Load, and Sliding Distance on dry sliding wear of composites. The aim of the model was to investigate dry sliding wear with "smaller is better" characteristics. The results showed that sliding distance has the largest effect on wear, while the load is the most important factor in friction response. In GRA analysis, the combined effect of wear and frictional force is considered and the optimum combination is identified (S5 L1 D1 R4). The percent of the contribution of load, L (60.97 %) was known to be the most important factor influencing performance to wear. The % reinforcement, R (31.17%) was found to be the 2nd most influencing factor, followed by sliding distance, D (4.81%), and sliding velocity S (0.25%). The worn surfaces of fabricated composites in the best and worst conditions were examined using scanning electron microscopy for understanding the wear mechanism.

Abstract: This study has been conducted to optimize the dressing parameters to find the minimum surface roughness for internal grinding of hardened SKD11 steel using the Taguchi method. The input parameters used are coarse dressing depth, number of coarse dressing, fine dressing depth, number of fine dressing, non-feeding dressing, and dressing feed speed. The Analysis of Variance (ANOVA) and an analysis of the signal-to-noise (S/N) response are conducted to estimate the significance of each input parameter on the responses. It shows that the number of coarse dressing has the most decisive impact on Ra (88.28%). Furthermore, the discrepancy of the roughness average from the experiments and that from prediction are minor.

Abstract: Taguchi method is applied to optimize the compositions of Al-Mg-Ti-Cu-SiC hybrid composites for maximum wear resistance. Wear tests are performed on a pin-on-disc machine under a constant load of 3 kg on specimens of above composites prepared using Taguchi L9 orthogonal array through stir casting route. Each test is conducted for 30 minutes at disc rotational speed of 600 rpm. The contribution of each constituent is evaluated using ANOVA. Linear and quadratic regression models are also developed. The predicted results by these models are very close to the experimental results. It is found that Taguchi method is very successful in the optimization of particulate reinforcements (Mg, Ti, Cu and SiC) in the composites for maximum wear resistance.