Optimization of process parameters for minimum cutting temperature and surface roughness in turning of AISI 410 stainless steel impeller

In the present scenario of work, an investigation of experiment on CNC turning of AISI 410 stainless steel impeller has been brought into presentation. Turning parameters such as cutting speed (Cs), feed rate (Fr) and depth of cut (Dc) are taken into investigation and thus modeled for performance characteristics like cutting temperature (Ct) and surface roughness (Ra). The desirability function (Df) is employed in order to optimize the multi performance characteristics. In correspondence to the highest desirability, Cs: 80 m/min, Fr: 0.12 mm/rev and Dc: 0.59 are considered to be the optimal combination of process parameters. In result of Scanning electron microscopy (SEM), it denotes that the formation relating surface defect on AISI 410 are deposition of tool material particles, scratches and feed marks

A Guiding Framework for Process Parameter Optimisation of Thermal Spraying

Currently, most thermal spray coating service providers expect original equipment manufacturers (OEMs) to suggest the coating recipe, comprising of the right coating equipment, starting process parameters, type of inert gases, and robot program. The microstructure and mechanical properties may not comply in the first few runs. Feedback from a competent material testing service provider forms the initial step to adjust the parameters in the development journey, toward identifying the processing parameters required to obtain an acceptable coating. With the surge of interest in sustainable manufacturing, the time spent on trials in the future will shrink, and a more rigorous process needs to be applied to achieve the “right-first-time manufacturing” approach in thermal spraying. However, a framework for the systematic development of thermal spray parameter optimisation is lacking. This article provides a framework, based on a logical acumen, in selecting the right process parameters, using available data and prior knowledge about the thermal spraying process. To that end, the article summarises the extant developmental journey of thermal spray process parameters, by covering the aspects of equipment choice, robot and spray parameters, and how to minimise iterations, using diagnostic tools to get to the end solution most efficiently. This article, in its current form, will serve as a good guide for early career engineers and scientists or workers, to minimise the time processing window, by avoiding endless iterations to deposit a certain type of coating using thermal spraying. Besides, this work is also aimed at transforming academic research innovations to a robust and repeatable industrial manufacturing process

Characterization and analysis of Gomphonema sp frustule based on SEM/EDS

1576-1579Diatoms are unicellular algae whose cell wall structure is mainly made up of silicon dioxide (SiO2). Frustules were extracted from fresh diatom taxa (Gomphonema sp.) by treating with concentrated HNO3 and HCl. The Scanning electron microscope (SEM) images revealed that the diatoms have a valve asymmetrical to apical axis and raphe system is well developed and are unequal size. From significance of energy dispersive X - ray spectroscopy (EDS) examination it was proved that the frustules from diatoms are mainly made up of silicon through amorphous silica (SiO2)

Spectroscopic (FT-IR, FT-Raman and NMR) and NBO analysis of 3, 4-dimethylanisole by density functional method

Combined experimental and theoretical studies have been conducted on the molecular structure and vibrational, spectra of 3, 4-dimethyl anisole (DMA). The FT-IR and FT-Raman spectra of DMA have been recorded in the solid phase. The molecular geometry and vibrational frequencies of DMA in the ground state have been calculated by using the ab-initio Hartree-Fock (HF) and density functional methods (B3LYP) invoking 6-31+G (d,p) basis set. The optimized geometric bond lengths and bond angles obtained by HF method shows best agreement with the experimental values. Comparison of the observed fundamental vibrational frequencies of DMA with calculated results by HF and density functional methods indicates that B3LYP is superior to the scaled HF approach for molecular vibrational problems. The difference between the observed and scaled wave number values of most of the fundamental is very small. The thermodynamic functions and atomic change of the title compound has also been performed at HF/B3LYP/6-31+G(d,p) level of theories. A detailed interpretation of the FT-IR, FT-Raman, NMR spectra of DMA has also been reported. The theoretical spectrograms for infrared and Raman spectra of the title molecule have been constructed. The thermodynamic function of the title compound has also been performed at HF/6-31+G (d,p) and B3LYP/6-31+G (d,p) level of theories. Natural bond orbital analysis has been carried out to explain the change transfer or delocalization of change due to the intra-molecular interactions. Energy of the highest occupied molecular (HOMO) orbital and lowest unoccupied (LUMO) molecular orbital have been predicted

No Go Theorem for Self Tuning Solutions With Gauss-Bonnet Terms

We consider self tuning solutions for a brane embedded in an anti de Sitter spacetime. We include the higher derivative Gauss-Bonnet terms in the action and study singularity free solutions with finite effective Newton's constant. Using the methods of Csaki et al, we prove that such solutions, when exist, always require a fine tuning among the brane parameters. We then present a new method of analysis in which the qualitative features of the solutions can be seen easily without obtaining the solutions explicitly. Also, the origin of the fine tuning is transparent in this method.Comment: 17 pages, 3 figure

Montmorillonite-catalysed regiospecific rearrangement of benzyl phenyl ether

301-30

EFFECT OF CONVEX DIE ANGLE OF PORTHOLE DIE ON PLASTIC DEFORMATION AND EXTRUSION PROCESS IN TUBE EXTRUSION

ABSTRACT Port hole die extrusion has a great advantage in the forming of hollow section tubes that are difficult to produce by conventional extrusion with a mandrel on the stem. Because of the complicated structure of the die assembly, the extrusion of hollow section tubes has been investigated experimentally. During the hot extrusion of aluminum alloy 6061, the change of process parameters will affect the mechanical properties of extruded products. In this study, Taguchi method is applied to optimize the process parameters in hot extrusion of Al 6061 tubes under extrusion ratio of 24.03. The experiments are arranged by orthogonal array method in which Die with three channels and four channels are used as outer arrays, the factors selected as inner arrays are the billet heating temperature, the convex die angle, bearing length and the container temperature. The extrusions are subsequently tested for tensile test, flattening test, expanding test using a conical punch, surface finish and micro-structure. Test results are analyzed by the quality measurement of Taguchi method to find the relationship between the design process parameters and mechanical properties of the products and to acquire the optimal combination of parameter. Then based on the results obtained from the additive model, conformity experiments are performed

Clay catalysed facile rearrangement of diazoaminobenzene to p-aminoazobenzene

187-18

Erythropoietin receptor gene polymorphism in Indian pig lines

A restriction fragment length polymorphism (RFLP) based genotyping test was developed to assess a C/T polymorphism in the regulatory region of erythropoietin receptor (EPOR) gene of pigs. Homozygous CC animals were absent in all the genetic groups studied, whereas the locus appeared fixed with T alleles in indigenous animals. The association of allelic variants with traits like litter size at birth (LSB), litter size at weaning (LSW), litter weight at birth (LWB) and litter weight at weaning (LWW) were explored in Indian Large White Yorkshire (LWY), Duroc, Indigenous Ankamali and F1 crosses between LWY boars and Ankamali sows (CB). All the populations under study had very high frequency of T alleles, with desi group being fixed with T allele. Genotypes of EPOR gene were not associated with any of the litter traits. The allele frequencies remained under HWE except in desi group