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Optimal Design of Feeding System in Steel Castings
, Ph.D. Dissertation Sharif University of Technology ; Davami, Parviz (Supervisor)
Abstract
n the present study, the optimal design of feeding system in steel sand-mold castings is considered. The first part of this research includes fundamental studies on the physics of shrinkage defect formation during the casting process. The results of these studies lead to new findings on the mechanism of shrinkage defect formation, effect of melt quality on the distribution of defects within the castings and the connection between shrinkage and gases defects. The theoretical analysis of thermal criterion functions for the prediction of shrinkage defects in castings and introducing new criterion function with fewer shortcomings can be accounted as the other finding of this part. A new model...
Survey Effect Of Deoxidation Of Simple Carbon Steel Feeding In Sand Mold
, M.Sc. Thesis Sharif University of Technology ; Davami, Parviz (Supervisor) ; Varahram, Naser (Supervisor)
Abstract
Prevent shrinkage and porosity in the melting parts expensive attention has been cast as a piece of low cost healthy and free from defects in casting production. Calculated feeding distance and the required number of risers. Also ensure that more tests were done with computer simulation compared the results acceptable to have the cast and expensive to produce a piece has nearly no troubleshooting. Variety of factors can affect the riser effect is melting parts Read some of these factors include alloy melting, superheat and mold .... . Oxygen factor in the project as one of the molten factors between feeding distance for molten plain carbon steel melting components and parts reviews and...
Modeling the Effect of Pressure on the Shrinkages Distribution
, M.Sc. Thesis Sharif University of Technology ; Davami, Parviz (Supervisor) ; Abachi, Parvin (Supervisor)
Abstract
Due to the shrinkage defects, casting parts is sometimes unusable; as a result, researchers is tackling porosity removal problem, so that they would be able to cast parts in a way that have the least porosity. Nowadays, simulation is used to predict the location of the porosity. The design and the elimination of defects, which leads to additional costs, can reduce the overall costs in the projects.
In this thesis, we focus on shrinkage defects. The main cause of porosity is the drop of pressure. As a matter of fact, the thermal agitation of the molecules is weaker than the strong intermolecular forces that would pull the molecules; therefore, the molten metals’ density will be increased...
In this thesis, we focus on shrinkage defects. The main cause of porosity is the drop of pressure. As a matter of fact, the thermal agitation of the molecules is weaker than the strong intermolecular forces that would pull the molecules; therefore, the molten metals’ density will be increased...