Numerical study on the effect of hammering pressure on thickness reduction in hot tube metal gas forming process
الموضوعات : فصلنامه شبیه سازی و تحلیل تکنولوژی های نوین در مهندسی مکانیکعلی طالبی انارکی 1 , محسن لوح موسوی 2
1 - گروه مهندسی مکانیک، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.
2 - دانشکده مکانیک، واحد خمینی شهر، دانشگاه آزاد اسلامی، خمینی شهر، ایران.
الکلمات المفتاحية: Finite Element Method, Thickness, Hammering pressure, Hot Metal Gas Forming,
ملخص المقالة :
Nowadays, light weight and high strength metals are being used in various industries such as automotive and aerospace. Using aluminum-magnesium alloys is an efficient way to reduce the weight of a specific part. These alloys have poor formability in room temperature thus they should be formed at elevated temperature. Warm hydroforming and hot metal gas forming are conventional methods to form aforementioned alloys. It is proven that using hammering pressure is an efficient way in order to optimize hydroforming process that it improves formability and thickness distribution. In this paper, the effect of hammering pressure on hot free bulging of an Al6063 tube is investigated numerically and the results are compared with the results of constant pressure path. Results show that reduction of thickness is greater for peak constant pressure while using hammering pressure, due to gradual thickness reduction, could improve formability and thickness distribution. Results also show that axial feeding, increase the effect of formability caused by hammering pressure.
[1] Maeno T., Mori K., Fujimoto K., Development of the hot gas bulging process aluminum alloy tube using resistance heating, Key Engineering Materials, Vols. 410-411, 2009, pp. 315-323.
[2] Dohmann F., Hartl CH., Hydroforming-applications of coherent FE-simulations to the development of products and processes, Journal of Materials Processing Technology, Vol. 150, 2004, pp. 18-24.
[3] Shahbazi karami J., Payganeh Gh., Rakhodaei H., Computer Aided Design of the Tube Hydroforming and Dual Hydroforming Processes, Journal of Modern Processes in Manufacturing and Production, Vol. 4, 2015.
[4] Mori K., Patwari A.U., Maki S., Improvement of formability by oscillation of internal pressure in pulsating hydroforming of tube, CIRP Annals Manufacturing Technology, Vol. 53, 2004, pp. 215-218.
[5] Loh-Mousavi M., Bakhsi M., Mori K., Maeno T., Farzin M., Hosseinpour S.J., 3-D Finite element simulation of pulsating free bulge hydroforming of tubes, Iranian Journal of Science & Technology, Transaction B, Engineering, Vol. 32, No. B6, 2008, pp. 611-618.
[6] Loh-Mousavi M., Bakhshi-Jooybari M., Mori K-I., Hyashi K., Improvement of formability in T-shape hydroforming of tubes by pulsating pressure, Proc. IMechE Vol. 222 Part B: J. Engineering Manufacture, 2008, pp. 1139-1146.
[7] Liu Z., Wu X., Zhang D., Ding Y., Gao L., Yan X., Improvement of formability of Y-shaped tubular part of 6016 aluminum alloy by pulsating hydroforming, Proceedings of SAE-China Congress 2014: Selected Papers, Lecture Notes in Electrical Engineering, Vol. 328, 2015, pp. 221-225.
[8] Kim, B.j., Van Tyne, C.j., Lee, M.Y., Moon, Y.H., Finite element analysis and experimental confirmation of warm hydroforming process for aluminum alloy, Journal of Materials Processing Technology, Vol. 187–188, 2007, pp. 296– 299.
[9] Hwang Y.M., Wang K.H., Study on y-shape tube hydroforming of magnesium alloys at elevated temperatures, International Journal of Material Forming, Vol. 3, 2010, pp. 175-178.
[10] Maeno T., Mori K., Unou C., Optimisation of condition in hot gas bulging of aluminum alloy tube using resistance heating set into dies, Key Engineering Materials, Vol. 473, 2011, pp. 69-74.
[11] طالبی انارکی ع.، تحلیل عددی و تجربی تاثیر فشار نوسانی بر انبساط آزاد (بالج) داغ لوله به وسیله گاز، پایاننامه کارشناسی ارشد، دانشگاه آزاد اسلامی واحد نجفآباد،1394.