IJE TRANSACTIONS C: Aspects Vol. 30, No. 6 (June 2017) 920-925    Article in Press

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V. Modanloo and V. Alimirzaloo
( Received: October 27, 2016 – Accepted in Revised Form: April 21, 2017 )

Abstract    In this paper, torsion extrusion (TE) process on 1050 aluminum alloy was investigated by simulation as a severe plastic deformation (SPD) method and the effects of friction coefficient, angular velocity of the rotating die and punch speed on maximum punch force were studied. A finite element (FE) model was developed to simulate the TE process via DEFORM software. The FE results were validated compared with experimental results and then the FE model was used for implementing the set of simulations designed by Taguchi’s L9 orthogonal array. Maximum punch force was determined and put into signal to noise (S/N) ratio and the analysis of variance (ANOVA) techniques to specify the importance and contribution of parameters. The results indicated that the friction coefficient has the most effect on maximum punch force and effects of the angular velocity and punch speed are not sensible. Results analysis represented that maximum punch force enhances by increasing the friction coefficient. Moreover, friction coefficient of 0.18, angular velocity of 0.11 rad/s and punch speed of 0.2 mm/s lead to the minimum punch force.


Keywords    Torsion Extrusion, Maximum Punch Force, Finite Element Simulation, Taguchi Method


چکیده    در این مقاله، فرآیند روزنرانی چرخشی بعنوان یک روش تغییر شکل پلاستیک شدید روی آلیاژ آلومینیوم 1050 با شبیه­سازی بررسی و تاثیر ضریب اصطکاک، سرعت زاویه­ای قالب مدور و سرعت سنبه روی بیشینه نیروی سنبه مطالعه شد. یک مدل اجزای محدود با استفاده از نرم­افزار DEFORM برای شبیه­سازی فرآیند استفاده شد. صحت نتایج شبیه­سازی در مقایسه با نتایج تجربی تایید شد و سپس از مدل اجزای محدود برای اجرای آزمایشات طراحی شده با آرایه متعامد L9 تاگوچی استفاده شد. بیشینه نیروی سنبه استخراج شده و با استفاده از تکنیک­های نسبت سیگنال به نویز و آنالیز واریانس، میزان اهمیت و درصد مشارکت پارامترها مشخص شد. نتایج نشان داد که ضریب اصطکاک بیشترین تاثیر را بر بیشینه نیروی سنبه دارد و تاثیر سرعت زاویه­ای و سرعت سنبه نامحسوس است. با تحلیل نتایج مشخص شد که بیشینه نیروی سنبه با افزایش ضریب اصطکاک افزایش می­یابد. بعلاوه ضریب اصطکاک 18/0، سرعت زاویه­ای 11/0 رادیان بر ثانیه و سرعت سنبه 2/0 میلیمتر بر ثانیه منجر به کمترین میزان نیروی سنبه می­شود.


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