IJE TRANSACTIONS A: Basics Vol. 32, No. 4 (April 2019) 587-595    Article in Press

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A. Taheri Ahangar, M. Bakhshi-Jooybari, S. J. Hosseinipour and H. Gorji
( Received: December 31, 2018 – Accepted: March 07, 2019 )

Abstract    Aluminum and magnesium alloys are of materials for decreasing vehicle weight and consequently reducing fuel consumption. However, forming limitations regarding their low formability at room temperature are found when being manufactured by conventional forming processes. For this reason, development of new forming techniques, such as warm tube hydroforming, is needed to overcome such limitations. In addition, production of parts with sharp corners is nearly impossible using conventional forming processes. This paper investigates the possibility of forming stepped tubes with high expansion ratio, sharp corner radii and precise geometric shape using a developed hybrid hydroforming and bending method. To assess tube formability, the bulge test was adopted with different forming temperatures and axial feeds. It is shown that using the feed of 35 mm and feed rate of 15 mm/min, a stepped tube with 47.6 % expansion ratio and corner filling ratio of about 100 % (part with sharp corners) could be achieved when adopting the developed hybrid hydroforming and bending method at 150 ᵒC.


Keywords    Aluminum Alloy; Corner Filling; Stepped Tube; Tube Hydroforming; Warm Hydroforming



آلیاژهای آلومینیوم و منیزیم از موادی هستند که باعث کاهش وزن خودرو و در نتیجه کاهش مصرف سوخت میشوند. با این حال، محدودیت هایی در ارتباط با شکل پذیری پایین آنها در دمای اتاق، زمانی که توسط فرایندهای تولید متعارف تولید می شود، پیدا می شود. به همین دلیل، برای غلبه بر چنین محدودیت هایی، نیاز به توسعه تکنیک های شکلدهی جدید، از جمله هیدروفرمینگ گرم لوله است. علاوه بر این، تولید قطعات با گوشه های تیز با استفاده از فرایندهای شکل گیری معمول تقریبا غیرممکن است. در اين مقاله قصد داريم تا با استفاده ازیک روش ترکیبی هيدروفرمينگ و خمکاری ، امکان تشکيل لوله هاي پلهای با نسبت انبساط بالا، شعاع گوشه تيز و شکل هندسي دقيق را بررسي کنيم. برای بررسی شکل پذیری لوله، آزمون بالج در دماها و تغذیه محوری مختلف انجام شد. نشان داده شده است که با استفاده از تغذیه 35 میلیمتر و سرعت تغذیه 15 میلی متر بر دقیقه ، یک لوله پله با نسبت انبساط 47.6 درصد و نسبت پرشدگی حدود 100 درصد (قطعه کار با شعاع گوشه های تیز) ، در هنگام اتخاذ هیدروفرمینگ ترکیبی توسعه یافته با خمکاری در دمای C 150قابل دستیابی است.


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