پديد آورنده :
عمادي فر، يوسف
عنوان :
طراحي، شبيه سازي و تحليل نرم افزاري فورج بدون پليسه قطعات برنجي مورد استفاده در صنايع توليد شير و اتصالات
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
ساخت و توليد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
ده، 72ص.: مصور، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد مشاور :
محمود كدخدايي
توصيفگر ها :
المان محدود , فورج داغ , نيروي فورج , دماي قالب , تنش موثر , عمرقالب
تاريخ نمايه سازي :
27/9/91
استاد داور :
محمدرضا فروزان، پيمان مصدق
تاريخ ورود اطلاعات :
1396/09/22
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Design Simulation and Analysis of Flashless Forging of Brass Parts Used in Valve Manufacturing Industry Yusuf Emadifar Email y emadyfar@me iut ac ir 2012 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc language FarsiSupervisor Seyed Mohsen Safavi E mail mosafavi@cc iut ac irAbstractConsidering the developments in industry old fashioned manufacturing processes are being replaced by moresophisticated methods That being said each new manufacturing method can be considered as the same oldmanufacturing process which is well optimized One of the most prominent processes in manufacturing of brassparts is forging which is still highly applicable due to its unique advantages One of the disadvantages offorging in old fashion method is that a great portion of the material is wasted through flash In order to reducethe amount of wasted materials new forging techniques have been developed mostly known as flashlessforging Specially for costly materials such as brass such reduction in wasted materials can pronouncesignificant importance In the present study the forging process of gas valve has been simulated which isquite impressive from simulation point of view In the first step the current industrial process was identifiedand simulated so which the flaws and problems could be specified thoroughly Following this suggestions weremade to improve the process It was observed that not only the problems of the process were eliminated but alsothe forging force was reduced by 22 In the next step three different die designs for flashless forgingtechnique have been proposed Among these three dies the die with controlled flash was rejected because thedie was not fully filled in the very initial steps of simulation From two other die designs only the conventionalflashless die was approved The flashless die with special punch was rejected due to dramatic increase of stress observed in one of the punches which eventually brought the assumption of very low fatigue life of the punch Conventional flashless forging die has 30 greater forging forces in comparison with improved conventionalforging die with flash Consequently conventional flashless dies expose greater stresses to its components andhas shorter fatigue life However conventional flashless forging die has 12 greater tool wear compared withimproved conventional forging die with flash The cost of flashless dies is less and the production rate would beincreased due to elimination of trimming process It was observed that the temperature of the die and work piecewas increased slightly In general the initial billet weight which was 164gr was reduced by 24gr which is asignificant improvement in mass production Therefore by spending more effort in tool selection andaccessories such as billet trimmer saw the design can be proposed to the industry Billet trimmer saw tolerancesmore than 0 2 mm causes either damage to the die or not fill it By utilizing this design in industry productionrate would be increased while the production costs can be reduced dramatically Key wordsFinite element method Hot Forging Flashless Forging Forging Force Die Temperature Effective Stress Die Life
استاد مشاور :
محمود كدخدايي
استاد داور :
محمدرضا فروزان، پيمان مصدق
