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cold-forging
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Optimization of Forging Processes with Concurrent Approach
, M.Sc. Thesis Sharif University of Technology ; Hosseini Kord Khyli, Ali (Supervisor)
Abstract
With the increasing complexity of manufacturing processes and the interrelations between the different phases, the possibility of a phase being affected by a preselected desing variable is very high. In that case, the influence of a desing variable not only on the part performance of but also on the feasibility and efficiency of its manufacturing should be considered. Concurrent engineering approaches should then be adopted to take the control of such complicated relations among the subprocesses. In this thesis a concurrent design optimization methodology was proposed to minimize the cost of a cold forged manufacturing process using the design parameters as optimization variables. An...
Prediction of the mechanical properties of rods after cold forging and heat treatment
, Article International Journal of Advanced Manufacturing Technology ; Volume 69, Issue 9-12 , December , 2013 , Pages 2071-2079 ; 02683768 (ISSN) ; Sharif University of Technology
2013
Abstract
A hybrid algorithm based on the finite element method, Monte Carlo model, and Hall-Petch relationship is utilized to predict the mechanical properties of the rods after cold forging at different degrees of deformations and heat treatments at different temperatures and times. The results show that the flow stress and hardness of the rods after forging and those of the forged rods after the heat treatments are decreased from their center to surface. However, with increasing the temperature and time of the heat treatment the flow stress and hardness are decreased, their effects are not considerable. In addition, the distribution of the mechanical properties of the forged rods after the heat...
An investigation into the effect of various surface treatments on fatigue life of a tool steel
, Article Journal of Materials Processing Technology ; Volume 174, Issue 1-3 , 2006 , Pages 318-324 ; 09240136 (ISSN) ; Ghadbeigi, H ; Sharif University of Technology
2006
Abstract
The effects of nitriding, nitrocarburizing and shot peening on fatigue behavior of AISI D3 cold work tool steel were investigated. Five batches of fatigue specimens were manufactured according to the ASTM E466-96 standard. All specimens were quenched and tempered to a hardness of 50 HRC. One group of specimens was shot peened with an Almen intensity of 16 A, one group was nitrocarburized, one group was gas nitrided by single stage and another group was also nitrided by double stages. Rotating-bending fatigue tests were carried out. Our results showed that nitriding and nitrocarburizing treatments did not have a beneficial effect on the fatigue resistance of D3 tool steel. Fatigue test...