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Article
Finite Element Analysis of Deformation Behavior of Wire Cold Flat Rolling

Author: Abdul Kareem Flaih Hassan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 11 Pages: 2102-2113
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Flat rolling of wire is an industrial process used to manufacture electrical flat wire, medical catheters, springs and piston segments, among other products. This paper presents a 3D finite element analysis of wire flat rolling. The variations of rolling force due to roll speed changes, Effect of reduction in height on width of contact Area, andLateral spread of wire has been discussed. It is found that a negligible increase in flow stress and rolling force does occur due to increase in the strain rate at room temperature. Besides, the results showed that the behavior of rolling force variation versus roll speeddepends on the rolling reductions. A theoretical relationship has been developed to relate the reduction in height of wire to the width of contact area between the rolls and wire. This relationship depicts that the width of contact area is proportional to square root ofreduction in height of wire. Finally the finite element can give a reasonable estimation of the deformation behavior in wire flat rolling, since the theoretical predictions are reasonable agreement with the experimental measurements of other authors.


Article
Finite Element Simulation of Deep Drawing Parameters Effects on Cup Wall Thickness

Authors: ABDUL KAREEM FLAIH HASSAN --- ALI HASOON ABDULHADI
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2014 Volume: 14 Issue: 2 Pages: 91-98
Publisher: Basrah University جامعة البصرة

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Abstract

The present research aims to predict the thickness distribution of a wall of a deep drawn cup. A simplified 3D axisymmetric model which represents the deep drawing set (blank and tools) was created using a CAD software, and then imported into a finite element code ANSYS where a simulation was carried out. The model represents a cylindrical cup made of low carbon steel sheet. The results showed that the FE model represents real deep drawing process fairly well. The cup thickness distribution values showed a good agreement with the referenced values, where the failure or success of drawing process could be predicted based on the obtained thickness results. It was observed that a high value of friction restrains material movement and resulted in producing more thinning and more punch force. High blank holder force was found to decrease the thickness of both the bottom face of the cup and the flange rim. While increasing die corner radius increases thickness and the maximum thinning occurred at the smallest die corner radius. It was found by decreasing the punch profile radius the thickness at the flat bottom of the cup and under the punch profile region were reduced.

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Article
THREE DIMENSIONAL FINITE ELEMENT SIMULATION OF COLD FLAT ROLLING
تمثيل ثلاثي الإبعاد لعملية الدرفلة على البارد باستخدام طريقة العناصر المحددة

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Abstract

In this paper the finite element analysis of the cold flat rolling is well presented to predict the roll force, slab velocity at entry and exit, temperature rise in the slab during cold rolling, strain and stress distribution around the slab. The effects of friction coefficient and yield stress of slab material on rolling are assumed. It is found that maximum force occurs at the position of neutral point between entry and exit, also it is found that the velocity of slab at exit is larger than that at entry. The finite element results of temperature distribution around the slab predict that there is a considerable rise in slab temperature.

في هذا البحث تم تحليل عملية الدرفلة على البارد باستخدام طريقة العناصر المحددة وذلك لغرض تخمين القوة المؤثرة على الدرفيل، سرعة الكتلة المدرفلة في بداية الدخول والخروج من الدرافيل، الارتفاع في درجة حرارة الكتلة نتيجة التشوه الدن، واخيراً توزيع الانفعال والاجهاد المؤثرة خلال عملية الدرفلة. تم الأخذ بنظر الاعتبار معامل الاحتكاك واجهاد الخضوع للمادة المدرفلة. النتائج المستحصلة توضح ان أقصى قيمة للقوة المؤثرة على الدرافيل تكون في نقطة التعادل والتي تقع في مكان ما على سطح التماس بين منطقة الدخول والخروج كذلك توضح النتائج ان سرعة الكتلة المدرفلة تكون اكبر في منطقة الخروج عن تلك السرعة في منطقة الدخول. ان النتائج المستحصلة بطريقة العناصر المحددة توضح ان هناك ارتفاع في درجة حرارة الكتلة المدرفلة يجب ان تؤخذ بنظر الاعتبار.

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