scholarly journals Analysis and modelling of surface roughness in milling of JFRP composite using central composite design

2021 ◽  
Vol 1092 (1) ◽  
pp. 012013
Author(s):  
Mir Akmam Noor Rashid ◽  
Zakaria Mohd Zain ◽  
M.K. Nor Khairusshima ◽  
Wazed Ibne Noor ◽  
Momin Mullah ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Central Composite Design ◽  
Central Composite

scholarly journals Central Composite Design Optimisation in Single Point Incremental Forming of Truncated Cones from Commercially Pure Titanium Grade 2 Sheet Metals

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3634
Author(s):  
Marcin Szpunar ◽  
Robert Ostrowski ◽  
Tomasz Trzepieciński ◽  
Ľuboš Kaščák
Keyword(s):  
Surface Roughness ◽  
Central Composite Design ◽  
Feed Rate ◽  
Incremental Forming ◽  
Single Point ◽  
Pure Titanium ◽  
Single Point Incremental Forming ◽  
Forming Force ◽  
Step Size ◽  
Central Composite

Single point incremental forming (SPIF) is an emerging process that is well-known to be suited for fabrication in small series production. The aim of this paper was to determine the optimal input parameters of the process in order to minimise the maximum of both the axial and the in-plane components of the forming force achieved during SPIF and the surface roughness of the internal surface of truncated-cone drawpieces. Grade 2 pure titanium sheets with a thickness of 0.4 mm were used as the test material. The central composite design and response surface method was used to determine the number of experiments required to study the responses through building a second-order quadratic model. Two directions of rotation of the forming tool were also considered. The input parameters were spindle speed, tool feed rate, and step size. The mathematical relations were defined using the response surfaces to predict the surface roughness of the drawpieces and the components of the forming force. It was found that feed rate has an insignificant role in both axial and in-plane forming forces, but step size is a major factor affecting axial and radial forming forces. However, step size directly affects the surface roughness on the inner surfaces of the drawpieces. Overall, the spindle speed −579 rpm (clockwise direction), tool feed 2000 mm/min, and step size 0.5 mm assure a minimisation of both force components and the surface roughness of drawpieces.

A Study on Coolant Parameters in Internal Grinding of 9CrSi Steel

2019 ◽  
Vol 950 ◽  
pp. 24-31 ◽  
Author(s):  
Le Xuan Hung ◽  
Vu Thi Lien ◽  
Vu Ngoc Pi ◽  
Banh Tien Long
Keyword(s):  
Surface Roughness ◽  
Regression Model ◽  
Central Composite Design ◽  
Flow Rate ◽  
Optimal Parameters ◽  
Machining Processes ◽  
Internal Grinding ◽  
Surface Method ◽  
Internal Cylindrical Grinding ◽  
Central Composite

This paper aims to analysis the effect of coolant parameters on surface roughness in internal cylindrical grinding of annealed 9CrSi steel. The concentration and flow rate of the coolant are investigated in thirteen experiments by central composite design and response surface method. The effect of each parameter and their interaction on the surface roughness are analyzed by their regression model. From that model, optimal parameters are determined to obtain the minimum surface roughness. The measured roughness matches with the predicted roughness from the regression model. This proposed is proven and it can be further applied for optimizing other machining processes.

scholarly journals Design of Experiment in the Milling Process of Aluminum Alloys in the Aerospace Industry

2020 ◽  
Vol 10 (19) ◽  
pp. 6951
Author(s):  
Aurel Mihail Țîțu ◽  
Andrei Victor Sandu ◽  
Alina Bianca Pop ◽  
Ștefan Țîțu ◽  
Dragos Nicolae Frățilă ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Aluminum Alloy ◽  
Central Composite Design ◽  
End Milling ◽  
Milling Process ◽  
Depth Of Cut ◽  
Main Task ◽  
Advantages And Disadvantages ◽  
Optimization Of Cutting Parameters ◽  
Central Composite

For many years, surface has quality received a serious attention due to its influence on various mechanical properties. The main contribution made in this scientific paper is the performance of actual experiments, as well as the experimental processing obtained in order to develop a model for predicting the surface roughness based on the optimization of cutting parameters. The novelty of this paper is brought by the method of obtaining the regression equation of the surface roughness, resulted from a standard end-milling process (standard milling tools, standard milling parameters, recommended by the tool manufacturer, 3 axis CNC machine and standard vice), on aluminum alloy 7136 in temper T76511, through two statistical methods of data analysis. This material is used for the production of extruded parts and is poorly understood for the proposed line of research. This study’s aim is to determine the surface roughness equation obtained by the milling of aluminum alloy 7136 in two ways: using Taguchi′s experimental design once and the other, using the central composite design. The Taguchi method and the central composite design are used to develop an efficient mathematical model to predict the optimal level of certain processing parameters. Using ANOVA analysis, a comparative study of calculated and experimental surface roughness values is carried out. The initial characteristics (surface roughness) and the controlled factors (cutting speed, depth of cut and feed) are analyzed with the Minitab program. Finally, an analysis of the advantages and disadvantages of the two methods used is presented. This study has a great industrial application, since the main task of every manufacturer is to achieve a better quality of the final product with minimal processing time.

Development and optimization of solid lipid nanoparticles of amikacin by central composite design

2009 ◽  
Vol 00 (00) ◽  
pp. 090721051030036-8
Author(s):  
Jaleh Varshosaz ◽  
Solmaz Ghaffari ◽  
Mohammad Reza Khoshayand ◽  
Fatemeh Atyabi ◽  
Shirzad Azarmi ◽  
...  
Keyword(s):  
Central Composite Design ◽  
Solid Lipid Nanoparticles ◽  
Lipid Nanoparticles ◽  
Solid Lipid ◽  
Central Composite

Formulation Design and Optimization of Repaglinide Solid Dispersions by Central Composite Design

2018 ◽  
Vol 11 (6) ◽  
pp. 4337-4348
Author(s):  
Bhikshapathi D. V. R. N. ◽  
Srinivas I
Keyword(s):  
Central Composite Design ◽  
Dissolution Rate ◽  
Solid Dispersion ◽  
Solid Dispersions ◽  
Solvent Evaporation ◽  
Release Mechanism ◽  
Solvent Evaporation Method ◽  
Onset Of Action ◽  
Evaporation Method ◽  
Central Composite

Repaglinide is a pharmaceutical drug used for the treatment of type II diabetes mellitus, it is characterized with poor solubility which limits its absorption and dissolution rate and delays onset of action. In the present study, immediate release solid dispersion of repaglinide was formulated by solvent evaporation technique. Repaglinide solid dispersions were prepared using PEG 8000, Pluronic F 127 and Gelucire 44/14 by solvent evaporation method. A 3-factor, 3-level central composite design employed to study the effect of each independent variable on dependent variables. FTIR studies revealed that no drug excipient interaction takes place. From powder X-ray diffraction (p-XRD) and by scanning electron microscopy (SEM) studies it was evident that polymorphic form of repaglinide has been converted into an amorphous form from crystalline within the solid dispersion formulation. The correlation coefficient showed that the release profile followed Higuchi model anomalous behavior and hence release mechanism was indicative of diffusion. The obtained results suggested that developed solid dispersion by solvent evaporation method might be an efficacious approach for enhancing the solubility and dissolution rate of repaglinide.

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