TY - JOUR ID - TI - Numerical Study of Tube Hydroforming Process Using Conical Dies دراسة عددية لعملية تشكيل الانابيب بضغط السائل بأستخدام قوالب مخروطية AU - Ahmad Ameen Hussain احمد امين حسين AU - Tahseen T. Othman Al-Qahwaji تحسين طه عثمان القهوجي PY - 2021 VL - 28 IS - 4 SP - 25 EP - 36 JO - Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية SN - 1813162X 23127589 AB - In this paper the effect of die angle, fluid pressure and axial force onloading paths were studied. In order to reduce the cost and time for theexperimental work, ANSYS program is used for implementing the FiniteElement Method (FEM), to get optimized loading paths to form a tubeusing double – cones shape die. Three double die angles θ (116˚ 126˚,136˚), with three different values of tube outer diametres (40, 45, 50) mmwere used. The tube length L_o and thickness t_o for all samples were 80mm and 2 mm respectively . The most important results and conclusions that have been reached thathad the highest wall thinning percentage of 26.8% with less corner fillingis at tube diameter 40 mm and cone angle of (116^°) at forming pressureof 43 MPa with axial feeding 10 mm. However, the lowest wall thinningpercentage was 6.9% with best corner filling at diameter 50 mm and conewere angle of (136^°) and forming pressure of 30 MPa with axial feeding4.5 mm. Two wrinkles constituted during the initial stages of forming thetube with initial diameter of 40 mm where the ratio d⁄(t=20) (thickwalled tubes) for all die angles, while only one wrinkle is formed at thecenter for tubes diameter 45 and 50 mm (thin-walled tubes) . Thedifference in the location and number of wrinkles at the first stage offormation depends on the loading paths that has been chosen for eachprocess, which was at the diameter 45 and 50 mm towards thin-wallcylinder deformation mode was uniaxial tension. The maximum wallthinning percentage was at the bulge apex for tube diameter 40 mm. But,the maximum wall thinning for tubes of diameters 45 and 50 mm wasfound at the two sides of the bulge apex .

تم دراسة عملية تشكيل االنابيب بضغط السائل من ناحية تأثير زاوية القالب و ضغط السائل والقوة المحورية على مسارات الحمل بواسطة تطبيقبرنامج )ANSYS14 (في تنفيذ طريقة العناصر المحددة (Method Element Finite ,)والحصول على مسارات الحمل المثلى لتشكيل االنبوب في° قالب على شكل ثنائي المخروط ولثالث زوايا للقالب بلغت 136(, 126°, 116°( وثالثة أقطار خارجية لألنبوب بلغت � ER -