پديد آورنده :
احمدي، احسان
عنوان :
شبيه سازي حرارتي فرآيند ريخته گري گريز از مركز افقي براي توليد لوله هاي چدني
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
شانزده،116ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمدرضا فروزان
استاد مشاور :
بهزاد نيرومند
توصيفگر ها :
انتقال حرارت , تحليل اجزا محدود
تاريخ نمايه سازي :
23/9/92
استاد داور :
محمود كدخدايي، احسان فروزمهر
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
116 Thermal Simulation of the Horizontal Centrifugal Casting to Produce the Cast Iron Pipes Ehsan Ahmadi e ahmadi@me iut ac ir Date of Submission 11 09 2013 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Dr Mohammad Reza Forouzan forouzan@cc iut ac irAbstractContinued developments in the casting techniques in the first half of the 20th caused the invention ofhorizontal centrifugal casting method to produce pipes which is gradually replaced instead of sand castingmethod ductile iron pipes which are casting by same method in the De lavuad machine are being used as thestandard pipes in modern drinking water and wastewater networks for years Investigation of heat transferduring the solidification of metal in centrifugal casting devices is important in connection with thedevelopment of advanced technologies for producing various types of castings such as ductile iron pipes Thequality of casting is closely related to the distribution of the surface temperature of mold cavity On the otherhand the mold temperature changes rapidly with time and because of this temperature variation steepthermal gradients and high stresses are generated It is well known that the major reasons for failure of themold is thermal fatigue when the cast is produced with the mold So the distribution of the surfacetemperature of mold cavity has a direct affect on the quality of the casting and the life of the mold Usingnumerical technology to predict the temperature distribution of various parts of the mold and its variation isvery important to improve the casting quality increase the service life of mold and reduce costs The maingoal of this dissertation is thermal simulation of horizontal centrifugal casting to produce ductile iron pipe byusing finite element method The process is simulated in ANSYS commercial software developing relatedANSYS codes macros In this research a numerical axisymmetric model of the pipe and mold is proposed and history of the thermal distribution in cast and mold during solidification and thermal cycle of casting isobtained In the simulation latent heat due to solidification thermal resistance in metal mold interface due tomold coating and air gap initial and boundary conditions proportional to practical conditions andthermophysical properties of material which are function of temperature are also considered Thecomparison to results of the thermal simulation show good agreement with the experimental resultsconducted in this study and numerical results by the numerical results found in the literature The results canbe used as input data for the numercial model to estimate thermal fatigue life of a permanent mold Theresults of simulation have shown that the thermal resistance of the air gap and mold coating have asignificant effect on the temperature distribution in the pipe and the mold Pouring process causestemperature gradients in the radial and axial direction in mold and cast Key WordsHorizontal centrifugal casting Heat transfer Thermal simulation FE Analysis
استاد راهنما :
محمدرضا فروزان
استاد مشاور :
بهزاد نيرومند
استاد داور :
محمود كدخدايي، احسان فروزمهر
