توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱An Investigation in Effects of Tool Geometry and Friction Coefficient on the Maximum Drawing Force in Deep Drawing Process by Finite Element Method
اطلاعات انتشار: همایش ملی آشنایی با فناوریهای روز در زمینه مهندسی مکانیک، سال
تعداد صفحات: ۸
Many parameters are effective in deep drawing process. Some of these parameters that affect success or failure of a deep drawing process are tool geometry, friction coefficient and drawing force that cause the rupture and wrinkling in deep drawing process of axisymmetric hollow containers. In this paper, at first, a basic theory of deep drawing and also a review of various methodologies formulated for the finite element modeling of deep drawing were presented. Then a numerical model was developed to investigate the effects of friction coefficient and geometric parameters on maximum drawing force in the forming of sheet metal SPXI250 under simple cylindrical deep drawing conditions by finite element (FE) simulation done by using ABAQUS\EXPLICIT software. The required force for forming was examined in this paper. The results of simulations show that a change in friction coefficient between interface surfaces leads to a significant difference on the maximum drawing force of the punch and decrease the rupture in the blank and also the effect of the matrix radius on the drawing force is more important than the effect of the punch rim's radius. The results of this paper were compared with the Sieble's theory and experimental tests and with the results of the other researchers. There was a high level of agreement between the findings of the present study and the findings of the other researchers.<\div>

۲Application of Taguchi Method for Optimization of Surface Roughness in Milling
اطلاعات انتشار: همایش ملی آشنایی با فناوریهای روز در زمینه مهندسی مکانیک، سال
تعداد صفحات: ۴
In this study, the Taguchi method will be used to find the optimal cutting parameters for surface roughness in milling. An L9 orthogonal array, the signal–to–noise ratio, and analysis of variance will be employed to study the performance characteristics in milling operations of Df2 (1.2510) steel using TiN coated tools. Three cutting parameters namely, spindle speed, feed rate, and depth of cut, will be optimized with considerations of surface roughness. Experimental results are presented to illustrate the effectiveness of this approach.<\div>

۳Analysis of the Effect of Friction Coefficient and Tool Geometry on the Changing of Wall Thickness in Deep Drawing Process by Finite Element Method
اطلاعات انتشار: همایش ملی آشنایی با فناوریهای روز در زمینه مهندسی مکانیک، سال
تعداد صفحات: ۸
Deep drawing is one of the important sheetmetal forming processes. By using this process, many parts are manufactured in industries. This process is influenced by many parameters. In this paper, the effects of friction coefficient and tool geometry on the changing of the wall thickness in SPXI250 alloy sheet of the axisymmetric hollow containers were investigated by simulation using finite element method (FEM). The finite element simulation of deep drawing process was done by using ABAQUS\EXPLICIT software. The results of simulations show that a change in friction coefficient between interfaces of different parts of the die and the blank lead to a large difference on the wall thickness. Also it shows the effects of the matrix radius on the final wall thickness are more important than the effects of the punch rim's radius. The results of this study were compared with the results of the other researchers and with experimental tests. There was a high level of agreements between the findings of the present study, experimental results and those of the previous which confirmed the results of this study.<\div>

۴Numerical Simulation of Flow in Cooling Air Jacket of a Spray Dryer
اطلاعات انتشار: نخستین کنفرانس خاورمیانه ای خشک کردن، سال
تعداد صفحات: ۴
Use of cooling air jacket in spray dryer is a way that would be useful to reduce stickiness of particles on dryer wall. Air flow analysis in this zone, can determine the air flow pattern and heat transfer contour. Simulation has been achieved by computational fluid dynamics (CFD) technique and by using of Fluent 6.1 software. k–ɛ standard model was used to resolve the flow turbulent. Based on the flow path line, air layers have a smooth and harmonic motion to each other so that there is little axial velocity variation. However, the central line of flow has the maximum velocity. In conjunction between cylindrical and conical parts of dryer in the air jacket, there is a bit deviation of flow toward the dryer wall which has been occurred because of changing the air flow direction.<\div>
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