Wyniki wyszukiwania - BazTech

1

Catalytic Debenzylation of 2,4,6,8,10,12-Hexabenzyl-2,4,6,8,10,12-hexaazatetracyclo [5.5.0.0.3,1105,9] Dodecane with Pd(OH)2/Al2O)3 in a Batch Suspension Reactor and Optimization of the Reaction Parameters via the Taguchi Method

Bayat Yadollah, Azizkhani Vahid

Central European Journal of Energetic Materials

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2022

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Vol. 19, no. 3

231--247

EN

In this paper, the Taguchi method was used for the optimization of the reaction parameters for the synthesis of 2,6,8,12-tetraacetyl-4,10-dibenzyl-2,4,6,8,10,12-hexaazatetracyclo[5,5,0,03,11,05,9]dodecane in the presence of Pd(OH)2/Al2O)3 catalyst in a batch suspension reactor. In order to achieve optimal conditions for this reaction, the experimental studies were conducted under varying reaction parameters, such as temperature, pressure, catalyst to substrate weight ratio, reaction time, and co-catalyst amount. The setting of the reaction parameters was determined in Qualitek-4 (Nutek®) software using the Taguchi experimental design method. Identification of the significant factors and their attributed levels in the Taguchi method were statistically performed via the analysis of variance (ANOVA) technique.

2

Taguchi Approach for Optimization of Parameters that Effect Grain Size of Cast A357 Alloy

Çolak M., Dışpınar D.

Archives of Foundry Engineering

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2017

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Vol. 17, iss. 4

35--42

EN

Grain refining and modification are common foundry practice for improving properties of cast Al-Si alloys. In general, these types of treatments provide better fluidity, decreased porosity, higher yield strength and ductility. However, in practice, there are still some discrepancies on the reproducibility of the results from grain refining and effect of the refiner’s additions. Several factors include the fading effect of grain refinement and modifiers, inhomogeneous dendritic structure and non-uniform eutectic modification. In this study, standard ALCAN test was used by considering Taguchi’s experimental design techniques to evaluate grain refinement and modification efficiency. The effects of five casting parameters on the grain size have been investigated for A357 casting alloy. The results showed that the addition of the grain refiner was the most effective factor on the grain size. It was found that holding time, casting temperature, alloy type and modification with Sr were less effective over grain refinement.

3

A Statistical Approach for Obtaining the Controlled Woven Fabric Width

Shaker K., Umair M., Maqsood M., Nawab Y., Ahmad S., Rasheed A., Ashraf M., Basit A.

Autex Research Journal

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2015

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Vol. 15, no. 4

275--279

EN

A common problem faced in fabric manufacturing is the production of inconsistent fabric width on shuttleless looms in spite of the same fabric specifications. Weft-wise crimp controls the fabric width and it depends on a number of factors, including warp tension, temple type, fabric take-up pressing tension and loom working width. The aim of this study is to investigate the effect of these parameters on the fabric width produced. Taguchi’s orthogonal design was used to optimise the weaving parameters for obtaining controlled fabric width. On the basis of signal to noise ratios, it could be concluded that controlled fabric width could be produced using medium temple type and intense take-up pressing tension at relatively lower warp tension and smaller loom working width. The analysis of variance revealed that temple needle size was the most significant factor affecting the fabric width, followed by loom working width and warp tension, whereas take-up pressing tension was least significant of all the factors investigated in the study.

4

A novel approach to enhance performance of multilayer coated carbide insert in hard turning

Shihab S. K., Khan Z. A., Siddiquee A. N., Khan N. Z.

Archive of Mechanical Engineering

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2015

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Vol. LXII, nr 4

539--552

EN

Flank wear of multilayer coated carbide (TiN/TiCN/Al2O3/TiN) insert in dry hard turning is studied. Machining under wet condition is also performed and flank wear is measured. A novel micro-channel is devised in the insert to deliver the cutting fluid directly at the tool-chip interface. Lower levels of cutting parameters yield the minimum flank wear which is significantly affected by cutting speed and feed rate. In comparison to dry and wet machining, insert with micro-channel reduces the flank wear by 48.87% and 3.04% respectively. The tool with micro-channel provides saving of about 87.5% in the consumption of volume of cutting fluid and energy.

PL

W pracy przedstawiono badania nad zużyciem krawędzi skrawającej wielowarstwowej płytki z ceramiki narzędziowej (TiN/TiCN/Al2O3/TiN) w toczeniu twardym na sucho. Badano także zużycie krawędzi skrawającej w warunkach toczenia na mokro. Nowatorskim rozwiązaniem było zastosowanie mikrokanału w płytce skrawającej, przez który płyn smarny dostarczany jest bezpośrednio do styku między narzędziem i wiórem. Uzyskany tą drogą niższy poziom parametrów skrawania zapewnia minimalne zużycie krawędzi skrawającej, na które w istotny sposób wpływają prędkość skrawania i szybkość posuwu. W porównaniu do warunków toczenia na sucho i na mokro, zastosowanie mikrokanału zmniejsza zużycie krawędzi skrawającej o odpowiednio 48,87% i 3,04%. Narzędzie z mikrokanałem zapewnia także oszczędność zużycia płynu smarnego i energii o ok. 87,5%.

5

Study on an Optimal Design of Mechanical Properties for PP/PET Nonwovens

Su T. L., Gui-Bing H.

Fibres & Textiles in Eastern Europe

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2012

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Vol. 20, no. 5 (94)

75--79

EN

This study aimed to determine the optimal process parameters of needle-punched nonwoven fabrics, and obtain the maximal strength of needle-punched nonwoven fabrics. The Taguchi approach and grey relational analysis were used to solve the multi-quality optimisation problem and determine the optimal process parameter combination of needlepunched nonwoven fabrics. The L9 orthogonal array was used to design parameters that affect the needle-punched nonwoven fabric process, including the folding machine oscillating speed, folding machine conveying speed, needle-punch depth, and needle-punch density. Then grey relational analysis was used to overcome the single quality characteristic disadvantage of the Taguchi approach, and the optimal process parameter combination of multiple quality characteristics was obtained from the response graph of the analysis. The quality characteristics of this experiment are the nonwoven fabric tearing strength and tensile strength. Signal-to-noise ratios (S/N ratio) were calculated and an analysis of variance (ANOVA) was conducted to analyse the experiment results. The results of ANOVA showed that the factors with a significant effect on the quality characteristics of needlepunched nonwoven fabrics included the needle-punch depth and needle-punch density. In other words, by controlling these factors the quality characteristics of the needle-punched nonwoven fabrics could be controlled effectively. Finally, the 95% confidence interval of the verification experiment proved that this experiment was reliable and reproducible

PL

Celem pracy było wyznaczenie optymalnych parametrów procesu, otrzymywanie włóknin igłowanych dla uzyskania optymalnych właściwości, w tym możliwie jak największej wytrzymałości mechanicznej. Zastosowano metodę Taguchi i analizę zbiorów rozmytych. Jako parametry wyjściowe przyjęto: prędkość oscylacji maszyny igłującej, szybkość transportową, głębokość igłowania oraz gęstość przeigłowań. Optymalizację przeprowadzano pod kątem uzyskania maksymalnej wytrzymałości włókniny oraz odporności na rozrywanie. Przy analizie określano poziom szumów sygnału oraz przeprowadzono analizę wariancji. Stwierdzono, że najistotniejszymi parametrami, które muszą być kontrolowane w czasie produkcji włókniny są głębokość i gęstość przeigłowań.

6

The use of the Taguchi approach to determine the influence of injection-moulding parameters on the properties of green parts

Berginc B., Kampuš Z., Šuštaršič B.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 15, nr 1-2

63--70

EN

Purpose: The paper is focused on the influence of injection moulding parameters on the properties of green parts in powder injection moulding. Because of the nature of this technology all the technological phases must be mastered. Design/methodology/approach: For the design of experiments (DOE) we used the Taguchi approach and the results were analysed with the analysis of variance (ANOVA). Findings: As is presented in the paper the injection moulding parameters have big influence on weight and dimensions of the green parts. The mould temperature, material temperature and holding pressure are the parameters which influence the dimensions most. The influence of cycle time has to be examined in further experiments. Research limitations/implications: It would also be advisable to conduct additional research on all the influential factors and their interaction. The factors would appear on three or more levels, which would make it possible to show the non-linear dependence of the output, and to optimize the process itself. Practical implications: The optimisation of injection moulding parameters gives better tolerances of both, the green parts and the sintered parts. Originality/value: Not much research work has been done to examine the influence of injection moulding parameters in PIM. With these experiments we upgraded our existing knowledge about the influence of the injection-moulding parameters on the dimensional accuracy of the green part, made from stainless steel 316L, and thus contributed to improving the process’s reliability.

7

Optimization of extrusion force prediction model using different techniques

Jurkovic Z., Jurkovic M., Buljan S.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

353--356

EN

Purpose: This research is determination of the optimal cold forward extrusion parameters with objective the minimization of tool load. Design/methodology/approach: This paper deals with the different optimization approaches relating to determine optimal values of logarithmic strain, die angle and coefficient of friction with the purpose to find minimal tool loading obtained by cold forward extrusion process. To achieve this, it has been carried out two experimental plans based on factorial design of experiment and orthogonal array. By using these plans it was performed classical optimization, according to response model of extrusion forming force, and the Taguchi approach, respectively. Findings: Experimental verification of optimal forming parameters with their influences on the forming forces was done. The experimental results showed an improvement in minimization of tool loading. It was compared results of optimal forming parameters obtained with different optimization approaches and based on that the analysis of the characteristics (features and limitations) of both techniques. Research limitations/implications: Suggestion for future research it will be application of evolutionary algorithms namely model prediction of the process by genetic programming and optimization of extrusion parameters by genetic algorithm. Practical implications: a practical (industrial) implication on the smallest energy consumption, longer tool life, better formability of the work material and the quality of the finished product. Originality/value: This paper is obtained original extrusion force model for experimental domain of forming parameters and identification of parameters influence in that model