پديد آورنده :
حسين پور، علي
عنوان :
شبيه سازي منحني كشيدگي يك قفسه نورد گرم و بررسي پارامترهاي مربوطه
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
نه، 101ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
محمد مشايخي
استاد مشاور :
محمدرضا فروزان
توصيفگر ها :
فرآيند نورد گرم , تغيير شكل غلتك
تاريخ نمايه سازي :
27/10/90
استاد داور :
سعيد ضيايي راد، عباس قائي
تاريخ ورود اطلاعات :
1396/10/12
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
FEM Simulation of Mill Strech Curve and Parameter Investigation Ali Hosseinpoor a hosseinpoor@me iut ac ir Date of Submission 2011 07 19 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mohammad Mashayekhi Mashayekhi@cc iut ac irAbstractRolled products should be characterized by a good quality and tight dimensional tolerances Because ofautomation that is commonly implemented in flat product rolling mills these products should meet therequirements of tightened tolerances particularly those of strip thickness and width and feature the greatestpossible flatness In order to obtain the correct shape of the strip upon exit from the deformation region allfactors influencing deformation region shape should be considered when determining roll gap height The spatial shape and dimensions of the roll gap are influenced by the elastic deformation of all parts of therolling stand equipment affected by the pressure force All the parts that compose the rolling mill aresubjected to elastic deformation by rolling force The ratio of the rolling force to amount of verticaldeformation of the whole rolling mill including the deformation of the rolls screw down device orhydraulic cylinder and housing is called mill modulus The mill modulus is 500 1000 ton mm for plate andhot rolling mills and 400 600 ton mm for cold rolling mills A rolling force of the order of 1 000 tons isgenerated during rolling so that mill deformation of more than 1 mm occurs Unless this deformation istaken into account thickness accuracy cannot be ensured Furthermore because the mill modulus has afinite value there exists a minimum thickness below which the rolling mill cannot reach The relationship between force and the vertical deformation of the whole rolling mill is mill stretch curve ormill modulus curve The rolling mill is not a simple spring and because several materials are sequentiallydeformed the curve is nonlinear But it is possible to measure the slope of linear part of mill stretch curve The slope of mill stretch curve defines the mill modulus The magnitude of elastic deformations depends on the type of roll assembly materials used the dimensionsof particular nodes friction force and clearance between equipment In this thesis mill stretch curve has been modeled by finite element method For modeling the mill stretchcurve all part of rolling stand equipment including work rolls backup rolls work roll chock backup rollchock liners hydraulic cylinder and main structure has been modeled It is found that the calculated millstretch curve and mill modulus agree very well with experimental curve and modulus reported fromMobarakeh Steel Company The effect of work roll diameters backup roll diameter friction coefficient and vertical and horizontal clearance on mill stretch curve and mill modulus was analyzed Keywords Mill stretch curve Mill modulus FEM Hot rolling
استاد راهنما :
محمد مشايخي
استاد مشاور :
محمدرضا فروزان
استاد داور :
سعيد ضيايي راد، عباس قائي
