پديد آورنده :
نامداري، نويد
عنوان :
بررسي تجربي و شبيه سازي اثرات پارامترهاي مختلف فرآيند ترموفرمينگ بر پروفيل نهايي يك قطعه ليوان پلاستيكي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
ساخت و توليد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مكانيك
صفحه شمار :
يازده، 74ص.: مصور، جدول، نمودار
استاد راهنما :
پيمان مصدق
توصيفگر ها :
شبيه سازي اجزاء محدود , ويسكوالاستيك , هايپرالاستيك , پلي استايرن مقاوم به ضربه , شكل پروفيل نهايي
تاريخ نمايه سازي :
1394/06/24
استاد داور :
محمود معصومي، رضا جعفري ندوشن
تاريخ ورود اطلاعات :
1396/10/04
چكيده فارسي :
به فارسي و انگليسي
چكيده انگليسي :
75Experimental and Simulation Study of Different Thermoforming ProcessParameters on the Final Profile of a Plastic Container Navid Namdari n namdari@me iut ac ir Date of Submission 2015 06 13 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Peiman Mosaddegh mosadegh@cc iut ac irAbstractIn recent years utilization of polymers in various industries is caused to invention of new methods to producenew products Thermoforming is one of the approaches to form polymer especially in home applinaces andpackaging industries In this process pre extruded polymeric sheet is heated and formed to the desired shape One of the problems in this process is to reach to the desired part dimensional accuracy of designed productespecially when the part should be assembled in a base Today try and error method which is costly and time consuming is a suitable approach to consider the effect of different process parameters on dimensionalaccuracy of products in both vacuum forming and drape forming processes In this study the final product isa cup with defined geometry and process parameters were initial sheet thickness initial temperature andvacuum pressure for vacuum forming For the drape forming process in addition to the above parameters plug speed in pre stretching phase was also an additional parameter The raw high impact polystyrene HIPS material used in experimental work had 0 15 0 3 and 0 5 mm thickness The experimental results showedthat an increase in temperature and vacuum pressure will improve the part dimensional accuracy The 0 3 mmsheet in thickness using vacuum forming and 0 5 mm sheet in thickness using drape forming give the bestdimensional accuracy than other sheets Decrease of the polymer viscosity due to increase the strain rate indrape forming process will increase the profile shape quality Experimental results illustrated that in vacuumforming process stretches are biaxial while in drape forming process stretches are uniaxial Comparisonbetween vacuum forming and drape forming showed that vacuum forming is better than drape forming toreach the desired part dimensional accuracy Also a hyper viscoelastic material model is used to simulate thebehavior of polymer in this study Comparison between experimental tests and simulation results showed thatthe maximum deviation is about 29 which indicates that hyper viscoelastic material model could properlymodel thermo mechanical behavior of HIPS In addition a numerical study of friction coefficient revealedthat decreasing the friction coefficient causes a better dimensional accuracy of the part Also a numericalstudy of the plug speed illustrated that the dimensional accuracy of the part will improve with an increase inthe plug speed Keywords Thermoforming Finite element simulation Viscoelastic Hyperelastic HIPS Finalprofile shape
استاد راهنما :
پيمان مصدق
استاد داور :
محمود معصومي، رضا جعفري ندوشن
