research centers


Search results: Found 3

Listing 1 - 3 of 3
Sort by

Article
Investigation of The Effect of Loading Paths in the Tube Hydroforming Process

Author: Adil SH. Jaber
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 12 Part (A) Engineering Pages: 1236-1243
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

The control accurately of internal pressure, axial feeding and pathsof loading which have important influences on the final tube quality. In thisresearch an impact of loading path of the tube hydroforming process andfinal part requirements ( i.e. thickness specification and shape conformation)were studied numerically. Small bulge shape tube hydroforming parts wereutilized in the finite element analyses to get several guidelines on the effect ofthe relation between the internal pressure and axial compressive feedingprograms. Two dimension model of bulge shape tube (50 mm) bulge widthhas been developed from cylindrical tube with thickness (2mm) of the copperand (60 mm) outer diameter. A commercial available finite element programcode (ANSYS 11), is used to perform the numerical simulation of the tubehydroforming operation. The results demonstrate that, the loading path hasvery important influenced on the thickness distribution over the tube andcapability attained the target shape of the required product


Article
Investigation of the Effect of Loading Paths in the Tube Hydroforming Process

Author: Adil Shbeeb Jaber عادل شهيب جابر
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2018 Volume: 18 Issue: 2 Pages: 40-52
Publisher: Basrah University جامعة البصرة

Loading...
Loading...
Abstract

The precise control of internal pressure andaxial feeding loading paths important influences thefinal tube quality. In this research the impact ofloading path of the tube hydroforming process andfinal part requirements ( i.e. thickness specificationand shape conformation) were studied numerically.Small bulge shape tube hydroforming parts wereutilized in the finite element analyses to get severalguidelines on the effect of the relation between theinternal pressure and axial compressive feedingprograms. Two dimension model of bulge shape tube(50 mm) bulge width has been developed fromcylindrical tube with thickness (2mm) of the copperand (60 mm) outer diameter. A commercial availablefinite element program code (ANSYS 11), is used toperform the numerical simulation of the tubehydroforming operation. The results demonstratethat, the loading path has very important influencedon the thickness distribution over the tube andcapability attained the target shape of the requiredproduct.


Article
Experimental and Finite Element Analysis on Rounded Corners Square Shape Tube Hydroforming Process
دراسة تشكيل الانابيب مربعة المقطع ذات الحواف الدائرية عمليا وباستخدام طريقة العناصر المحددة

Authors: Hani Aziz Ameen --- Nahedh Mahmood Ali
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 9 Part (A) Engineering Pages: 2148-2164
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

Tube hydroforming is a forming process where an inner pressure combined with axial feeding deforms the tube to the shape of a die cavity, i.e. the process state where the hardening of the material is unable to resist the increase in inner pressure and wall thickness reduction. In the current work the tube with circular cross section is deformed to square cross section using hydraulic pressure. The die of the square edges is designed and manufacturing to change the tube with circular cross section to square cross section. The die and tools were designed and manufactured in order to satisfy the experimental work.The hydraulic system manufactured is capable to give several values of internal pressure. Initially circular tubes are inflated against a square die while simultaneously they are axially compressed in order to delay wall thinning and burst and achieve an accept tube wall thickness distribution. The dimension of tube used in the experimental work of copper is (L=110 mm, do=9.4 mm , to=1.5mm) to obtain forming limit diagram and mechanical properties of tube and value of the bursting pressure and final thickness for copper tube (170MPa ) and 1.18 mm. A squared grid has been printed by screen method with dimensions (5x5mm) the strain measurement accomplished by measuring the dimensions of the grid printed before and after deformation. The finite element method was applied via ANSYS11software package in order to determine the tube thickness, stress and strain behavior and the internal pressure required to form the square shape tube and the radius of curvature of the tube.It was found that the generated strain during the tube hydroforming process in the square cross – sectional die was less than that in ANSYS software within 20%. The results showed good agreement.

عملية تشكيل الانبوب باستخدام التشكيل الهايدروليكي هو عملية تشكيل باستخدام ضغط السائل الداخلي جنبا إلى جنب مع القوى المحورية الى ان ياخذ الانبوب شكل القالب، بمعنى ان المعدن غير قادر على مقاومة الزيادة في الضغط الداخلي ونقصان سمك الجدران. في بحثنا هذا تم تحويل الأنبوب ذو المقطع العرضي الدائري الى مقطع عرضي مربع باستخدام الضغط الهيدروليكي. تم تصميم وتصنيع قالب ذو حواف مربعة لتغيير مقطع الانبوب من الدائري الى المربع. و باسلوب يناسب الاجراءات العملية. ان النظام الهيدروليكي المصنع قادر على إعطاء عدة قيم من الضغط الداخلي. بدءاً عند تسليط الضغط يحدث انتفاخ للانبوب الدائري ليأخذ شكل القالب المربع، بينما في الوقت نفسه يكون مضغوط محوريا من أجل تأخير التشققات في جدار الانبوب وتحقيق توزيع للسمك على جدار الانبوب. لقد تم استخدام انبوب من النحاس ذو ابعاد ( الطول 110 ملم، القطر الخارجي 9.4 ملم وسمك 1.5 ملم) للحصول على سمك نهائي للانبوب 1.18 ملـــــــم وبضغط 170 MPa . حيث استخدامت شبكة ذات مـربعات ( 5 × 5 ملم ) وتم قياس الانفعال قبل وبعد التشوه باستخدام هذه التقنية. تم تطبيق طريقة العناصر المحدودة من خلال برنامج ANSYS11 من أجل تحديد سماكة الأنبوب ، والإجهاد و الانفعال و الضغوط الداخلية اللازمة لتشكيل الأنبوب الى شكل مربع، وايضا تم دراسة نصف قطر انحناء حافة الأنبوب. تم مقارنة الانفعالات المتولدة خلال عملية التشكيل عمليا ونظريا ووجد انها تقل بنسبة 20% عن نتائج المستحصلة ببرنامج ANSYS. أظهرت النتائج توافقاً جيداً.

Listing 1 - 3 of 3
Sort by
Narrow your search

Resource type

article (3)


Language

English (3)


Year
From To Submit

2018 (2)

2014 (1)