ملخص البحث :

Sheet metal is widely used in industry and in different production processes. The present work aims to reduce the bending force in the air-die bending process. Different mild steel sheet thicknesses (0.5, 0.75, 1, and 1.25 mm) were considered, and two techniques were proposed. The first technique involves an annealing process, while the second one considers cutting a rectangular hole along the bending line. The bending stress was calculated using Autodesk inventor software. The results revealed that the annealing process can provide significant ductility improvement and hence bending force reduction, and that annealing time is an important factor that influences ductility development. Moreover, cutting a hole along the bending line could reduce the bending stress and consequently the bending force. The study also reported that increasing the thickness beyond a specific value could result in a reduction in bending force instead of an increase, which is attributed to a temperature increase in the sheet and bending tool.

ملخص البحث :

This work is focusing on fused deposition modelling (FDM) 3D printing; this process principle is making the sample by adding melted materials for each layer. Therefore, this process has several advantages that can solve many manufacturing problems by the control of remodelling the output sample by setting the printing parameters such as printing temperature, speed, infill percentage and layer height. Finding the suitable setting parameters for the output sample can be a great challenge for the user, which can affect the mechanical characteristics of the produced printed sample. This paper examines the impacts of the printing angles and orientation on the mechanical characteristics of the acid of polylactic (PLA) and the particles of carbon in the output sample. To calculate this influence, a 3D printed sample for tensile strength and charpy was made at 0○, - 45○, /+45º, 60° and 90º. The orientation was different but, the other of the factors hold constant such as infill density and layer height. Four different results were analysed for the impact resistance of these tests. The maximum impact resistance, 23.3 kJ, was obtained with 100% infill density and 0.1 mm layer height at 45º orientation. Results showed that printing angles (0°,-45/+45º, 60°) with 100% infill density is recommended. Furthermore, by making the comparison between the analysis finding with the finding of other studies, the printer parameters and materials were found to impact the mechanical characteristics of PLA sections significantly.

ملخص البحث :

A turbocharger performance of exhaust gas turbine on the diesel engines are studied the turbine driven compressor that is used for increasing air flow rate into internal combustion engine the angle of Blade effect on the flow field of turbine wheel. Angle of Blade of turbine wheel analyzed Based on the theory Computational Fluid Dynamics (CFD). How the various blade angle of turbine wheel due to optimization on flow field along the blade and leads to optimization in the pressure and velocity. Blade angle studied is conducted for understand the flow behavior in order to minimize the effects blade angle. in this paper dealing The Analyses the flow field along the blade passage of the turbine wheel for the turbocharger and study the effect flow field at different blade angle for turbine wheel outlet blade angle, β = 650, 450 and 350.

ملخص البحث :

For this time being; one of the main approaches in mass production is to control both quality and raw material consuming by smart design and analysis method. Estimating and controlling the main design parameters which effects on the productivity and quality, with design sensitivity analysis to control and optimize the geometry topology is the important key for any efficient manufacturing process. This article introduces a work relating to manufacturing process of a rubber pad which used in many industrial applications like automobile and aerospace by using finite element analysis. An efficient model has been created for solving this manufacturing process by using FEM. Commercial software (ABAQUS/CAE) has been adopted in this research for developing a standard design based on finite element analysis. This analysis will includes estimating and finding the effects of updating and modifying the geometry according to stresses concentration, thereby finding and specifying the main effecting parameters to estimate and determine the appropriate geometry design. One of the main objectives is to alter or modify the geometry to minimum or lowering axial stresses values, which help for increasing the service life. Study of design sensitivity is very important in improving any design through analysis process. It has been found from simulation results that effects of radius influence on stress generation is more than the effects of changing in rubber thickness. This analysis will also provide important information’s to ensure that the values of strains and stresses will not exceed the maximum range and rest in acceptable limits. Simulation results can be used to validate the experimental results and establish a new design formula through comparison. It has been found that a good relation between simulation results and experimental results. In order to increase the stiffness of the unit; steel parts are normally used and attached with rubber in many structural applications to bond and support the structure. The bonding between steel part and rubber will be stronger than the rubber material and will be very efficient with good suitability to attach during molding process.