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Article
Effect of Blank Holder Force on Strains and Thickness Distribution in Deep Drawing Process
تأثير قوة ماسك الغفل على توزيع الانفعالات والسمك في عملية السحب العميق

Authors: Ali Abbar Khleif --- Karem Muhsin Younis --- Ali Tuaimah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 8 Part (A) Engineering Pages: 2009-2019
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This work aims to study the effect of the blank holder force on strains and thickness distribution along cup wall of drawn part in deep drawing process. 2-D model of cylindrical cup of (40mm) outer diameter, and (0.5mm) thickness made from low carbon steel (1008–AISI), has been developed. A commercially available finite element package (ANSYS14.0) was used to perform the numerical simulation of deep drawing process. The experimental work carried out using digital image processing technique. Five values of blank holder force =5, 7.5, 10, 12, 15 KN) were adopted. The numerical results of this model were compared with experimental results and the results show that, the value of the thickness and hoop strain at cup rim decrease with increasing blank holder force, while radial strain increases with increasing blank holder force. The best thickness distribution over all zones in produced cup obtained when using blank holder force with value =10 KN).

يهدف هذا البحث إلى دراسة تأثير قوة ماسك الغفل على وتوزيع الانفعالات والسمك على جدار القدح في عملية السحب العميق. تم المحاكاة باستخدام نموذج ثنائي الإبعاد لكأس اسطواني بقطر خارجي (40mm) وسمك جدار(0.5mm) من فولاذ منخفض الكربون (1008–AISI) وذلك باستخدام طريقة العناصر المحددة باستخدام برنامج (ANSYS 14.0). والعمل التجريبي نفذ باستخدام ألمعالجه الصورية حيث تم اعتماد خمسة أنواع من قوة ماسك الغفل =5, 7.5, 10, 12, 15 KN).. ومن مقارنة النتائج المستحصلة من خلال المحاكاة مع نتائج العمل التجريبي بينت النتائج العملية و المحاكاة أن قيمة انفعال السمك والانفعال المحيطي في منطقة حافة القدح تقل بزيادة قوة ماسك الغفل بينما الانفعال النصف القطري يزداد بزيادة قوة ماسك الغفل كما اظهرت النتائج العملية و المحاكاة أن أفضل توزيع للسمك على جدار القدح تم الحصول عليه بقوة ماسك غفل ذو قيمه ( = (10 KN.


Article
Experimental Study and Numerical Simulation of Sheet Hydroforming Process for Aluminum Alloy AA5652
الدراسة العملية والعددية لمحاكاة قابلية التشكيل الهيدروليكي لصفائح سبيكة الألمنيوم AA5652

Authors: Muthanna Hamza Sadoon مثنى حمزه سعدون --- Sadiq Jaffar Aziz صادق جعفر عزيز --- Hiba AbdAli Jassim هبه عبد علي جاسم
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2015 Volume: 11 Issue: 4 Pages: 73-81
Publisher: Baghdad University جامعة بغداد

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Abstract

Lightweight materials is used in the sheet metal hydroforming process, because it can be adapted to the manufacturing of complex structural components into a single body with high structural stiffness. Sheet hydroforming has been successfully developed in industry such as in the manufacturing of the components of automotive.The aim of this study is to simulate the experimental results ( such as the amount of pressure required to hydroforming process, stresses, and strains distribution) with results of finite element analyses (FEA) (ANSYS 11) for aluminum alloy (AA5652) sheets with thickness (1.2mm) before heat treatment (BHT) and after heat treatment (AHT) respectively in the circular die with cavity equals to (20mm) . The comparison of results by these two approaches show the same tendency that an improvement formability, also the plastic deformation is greatly enhanced AHT for same metal.

استخدمت معادن خفيفة الوزن في عملية تشكيل الصفائح وذلك لتصنيع الهياكل المعقدة بهيئة واحدة وبصلابة عالية . عملية تشكيل الصفائح حققت نجاحا وتطورا في مجال الصناعة كما في تصنيع مكونات السيارات . ان الهدف من هذه الدراسة هو محاكاة النتائج العملية مثل كمية الضغط المطلوب لعملية التشكيل , توزيع الاجهادات والانفعالات مع نتائج برنامج التحليل العددي ( ANSYS11) لصفائح من سبيكة الالمنيوم AA5652 وبسمك (1.2 mm) قبل وبعد المعاملة الحرارية (التخمير) على التوالي في قالب دائري عمقه (20 mm ). مقارنة النتائج العملية مع برنامج المحاكاة كانت متوافقة من حيث تحسين قابلية المعدن على التشكيل وكذلك ازدياد المنطقة اللدنة للمعدن بعد عملية التخمير .


Article
Drawing of Hexagonal Shapes from Cylindrical Cups

Authors: Waleed Khalid Jawed --- Sabih Salman Dawood
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 6 Part (A) Engineering Pages: 1235-1246
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The main aim of this work is design and manufacturing cylindrical and hexagonal dies to produce hexagonal cups from transform the cylindrical cups to hexagonal cups and affect of wall corner radii of die. As well as using some parameters which effect of on the hexagonal deep drawing process, especially on the punch force, strain distribution and variation of the cup wall thickness for three stages such as (wall corner radius of die and punch speed). 3-D models of cylindrical cups of (43 mm) outer diameter, and diagonal and side distance of hexagonal cups are (41and36mm) respectively, (0.7mm) thickness made from low carbon steel (1006–AISI), has been produced. A commercially available finite element program code (ANSYS11.0), was used to perform the numerical simulation of deep drawing operation. Two types of wall corner radii of die ( =0.7, 4 mm) with constant punch profile radius equal to ( =4) mm and die profile radius equal to ( =8 mm), various drawing speeds equal to (50, 200, and 500 mm/min (were used. From the numerical and experimental results of drawing operation, it, the maximum thinning occurs at cup corner radius when used wall corner radius of die equal to ( = 0.7mm). The best strain and thickness distribution over all zones in produced cup obtained when using wall corner radius of die is equal to = 4 mm) and High drawing speed (v=500 mm/min) leads to increase drawing force and more thinning in cup corner.


Article
Drawing of Hexagonal Cup

Authors: Waleed Khalid Jawed --- Sabih Salman Dawood
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 7 Part (A) Engineering Pages: 1445-1456
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The main aim of this work is to produce hexagonal cup drawn from flat sheet (blank Ø80) and effect of wall corner radii of die on drawing process. The dimension of diagonal and side hexagonal cup are (41,36mm) and (36 mm) respectively, and (0.7mm) thickness made from low carbon steel (1006–AISI), has been produced. A commercially available finite element program code (ANSYS11.0), was used to perform the numerical simulation of drawing operation. Two types of wall corner radii of die ( =0.7, 4 mm) with constant punch profile radius equal to ( =4) mm and die profile radius equal to ( =8 mm (were used to investigate the effect of die corner radius on punch force, variation of cup wall thickness and the strain distribution over the cup wall. The numerical results of this model were compared with experimental results and the results show that, the greatest thinning occurs when used wall corner radius of die equal to ( = 0.7mm) due to great stretching of the metal over the corner radius. The best strain and thickness distribution over all zones in produced cup obtained when using wall corner radius of die is equal to = 4 mm).

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