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Three-dimensional numerical analyses were conducted to study fluid flow behavior over the rough surface in an electric submersible pump at the design and off-design conditions. The entire range of smooth, transition and fully rough surfaces was considered for the study of the turbulent boundary layer properties and its effect on the pump performance. The calculated performance using CFD showed a good...
This work presents the optimization while machining of Inconel superalloy as base material and copper as the electrode using ZNC electrical discharge machine with positive polarity. Formation of complex shapes by this material alloy with reasonable speed and surface finish is not an easy task with the traditional machining. Moreover, the edge profile (which is circular in this work) formed by the...
Ceramic cutting tools are widely used particularly in high-speed machining of difficult-to-machine materials. However, using cutting fluid with these ceramic tools significantly reduces tool life. Therefore, the inclusion of a cooling/lubrication method into the process to improve the machining performance of ceramic tools will make machining efficiency much more effective. The aim of this study is...
CL50WS material has been mainly used in tooling industries for making die, tool insert, mould or casting die. As the manufacturing of the CL50WS material parts from the DMLS machine differs from the conventional machining process, it is very essential to understand of DMLS behaviour and determine the proper optimal process parameter. Hence, the present study highlights the application of Box–Behnken...
In this present study, optimization of drilling parameters in hybrid Al-6061/SiC/B4C/talc composites was studied using grey relational analysis. The purpose of this research was the investigation of the effect of drilling parameters on Al6061/SiC/B4C/talc composites fabricated using the stir casting. These hybrid composites containing talc (solid lubricant) particles reduce thrust force, circularity...
CNC milling of curved surfaces is a common task in the manufacture of molds and dies of products used in various industrial sectors. Notably, in recent years, the use of hard milling has helped manufacturers to obtain these parts with shorter lead times, since the part is machined in a single setup without the problems caused by part distortions from the tempering process. In this work, cylindrical...
This paper presents a comparative study of both the surface roughness (Ra and Rz) and the tangential cutting force (Fz) achieved during the machining of EN-GJL-250 cast iron by uncoated and coated silicon nitride ceramics (Si3N4). Experimental tests were planned according to a L27 Taguchi design. Both the surfaces of response (RSM) and analysis of variance (ANOVA) methods were applied to determine...
Secondary finishing operations are the primary requirement of the manufacturing industries to achieve dimensional tolerance of the components. Burnishing is essentially a surface finishing operation usually performed after machining to achieve superfinishing. Diamond burnishing is one of the finest finishing technologies which has been conducted on any surface to attain mirror surface finish. The...
This paper deals with a novel integrated parametric optimization in end milling of Al–SiCp metal–matrix composites using carbide tool. Fuzzy logic modeling combined with particle swarm optimization (PSO) technique is applied as intelligent optimization methodology to obtain optimal process parameters in end milling process. Fuzzy rules-based surface roughness prediction model is developed with SiC...
The great challenge of modern industry is to carry out an online prediction in the shop floor during the machining to define the exact tool breakage instant and simultaneously improve the quality of manufactured products. Acoustic emission sensors have been used to monitoring traditional and non-traditional machining processes. This work shows a study of the online monitoring in the microturning process...
Inconel 625 superalloy is a versatile austenitic nickel-based superalloy with excellent strength and good ductility. It possesses excellent mechanical properties at both extremely low and extremely high temperatures with excellent resistance to pitting, crevice corrosion, cracking and crystalline corrosion. Inconel 625 superalloy is an important and frequently used material for an automobile, aerospace...
Electrical discharge machining (EDM) is an extensively used non-traditional machining process used for conductive materials to get intricate or complex shapes. For any manufacturing industry, optimum parameters of control variables are of sheer importance to improve multiple performance characteristics like surface integrity and productivity. This paper presents multi-objective optimization on the...
The exact positioning of micro/nanoparticles is essential in the construction of micro/nanoscale structures. Of course, the shape of a particle and the external force application location on it influence the type of behavior exhibited by that particle during its displacement on a surface. In former works, biological and non-biological particles have been modeled as cylindrical or spherical particles,...
In microelectro discharge machining, dielectric plays prime role in the machining performance. The performance of machining is highly affected by dielectric fluid used in the micro-EDM. This paper discusses the influence of various different dielectric fluids such as demineralised (DM) water, oxygenated DM water, mixture of ethylene glycol and DM water, alumina suspension in DM water, alumina suspension...
In this study AISI 1010 square-section material was drilled on CNC milling machine using friction drilling processes in two different patterns, namely constant feed rate and variable feed rate. In both drilling processes the tool–workpiece contact region temperatures, drilling forces, surface roughness and bushing profiles were examined. The drilling processes with constant feed rate used 50, 100...
Aluminium-based alloys are considered lengthily for many applications in engineering areas due to their good mechanical properties. Machining these alloys had attracted the attention of many researchers on how to improve the machining, especially when high manufacturing rate is demanded. Usually, machining these materials poses some difficulties such as burr formation, roughness of the surface, continuous...
The objective of the present experimental study is to find competency of magnetorheological fluid finishing process in improving the finishing and dimensional accuracy of miniature holes drilled by the electro-discharge drilling process. For this, holes of 2.0 mm diameter, drilled in aluminium 6063 alloy-based metal matrix composite, is finished using indigenously developed magnetorheological fluid...
In this analysis, the impact of the applied magnetic field and surface roughness on combined convection nanofluid flow past a stretching surface with roughness is investigated. The partial differential equations governing the flow fields are subjected to non-similar transformations. The transformed equations are quasi-linearised and then solved numerically using an implicit finite difference method...
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