3826

3618

كارشناسي ارشد

طراحي كاربردي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1386

[ده]، 119، [II]ص. :مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محمود سليمي

سعيد ضيايي راد

6/11/86

حسن نحوي، مصطفي غيور

مهندسي مكانيك

ID3618

به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال

Abstract Skin pass mill with capacity of producing 600000 ton strip per year is one of the most importantmills in Mobarakeh Steel Complex A small fault in this equipment causes many defects in stripand reduces the strip quality The aim of this thesis is investigation finding analyzing and suppression of appearing of chattermarks on strip surface In chapter one we define chatter in rolling process then in second chapterthe pervious formulation of rolling process is discussed and the formulation that is used in thisthesis introduced In third chapter the structure model of skin pass mill that is created based onmill parameters is introduced after that in forth chapter the model created in Simulink softwareis discussed and in fifth chapter the results of many simulations illustrated through diverse chartsand figures for example mill behavior is investigated using established linear system analysismethods as a function of a number of mill operational parameters such as friction coefficient strip entry velocity strip width and thickness and forward and backward tensions The effect ofeach parameter on mill stability and chatter onset has also been studied Finally in chapter six theindustrial observations in previous year in Mobarakeh Steel Complex and the results got fromthem are discussed and the possible ways of suppression of chatter in skin pass mill areintroduced

محمود سليمي

سعيد ضيايي راد

حسن نحوي، مصطفي غيور