مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

مطالعه تجربی و عددی فرآیند خمکاری کششی دورانی لوله‌های جدار نازک SS-304 با استفاده از مندرل‌های پلی یورتان و نیتریل

نوع مقاله : پژوهشی اصیل

نویسندگان
حمیدرضا قهرمان 1
محمد هنرپیشه 2
محمد باقر سرافرازی 3
1 کارشناس ارشد، گروه ساخت و تولید، دانشکده مهندسی مکانیک، دانشگاه کاشان
2 دانشیار، گروه ساخت و تولید، دانشکده مهندسی مکانیک، دانشگاه کاشان
3 کارشناس ارشد، گروه ساخت و تولید، دانشکده مهندسی مکانیک دانشگاه کاشان
10.52547/mme.22.5.303
چکیده
یکی از روش­های شکل­دهی لوله­ها، روش خمکاری کششی-دورانی است. امروزه خمکاری لوله­های جدارنازک

با شعاع انحنای کم یک فرآیند تولیدی پرکاربرد در صنایع خودروسازی، نظامی و هوافضا به شمار می­رود که برای خمکاری قطعات با استحکام بالا، استفاده می‌شود. در این مقاله ابتدا مدل‌های لازم برای انجام شبیه­سازی فرایند خم لوله، ایجاد شد و در ادامه خصوصیات مکانیکی لازم برای فولاد 304 و الاستومرها تعیین گردید. در ادامه به بررسی تجربی و عددی نیروی شکل­دهی و تغییرات ضخامت دیواره­ی لوله پرداخته شد. شبیه­سازی فرآیند با استفاده از مندرلهای الاستومری پلی­یورتان و نیتریل با استفاده از نرم­افزار المان محدود آباکوس بر روی فولاد 304 انجام گرفت که با مقایسه­ی بین نتایج شبیه­سازی و تجربی، انطباق خوبی بین نتایج مشاهده شد. همچنین اثرات پارامترهای فرآیند شامل جنس مندرل، قطر لوله و شعاع خم بر حداکثر نیروی شکل­دهی توسط آنالیز فاکتوریال مورد تحلیل قرار گرفت. نتایج نشان داد که حداکثر نیروی شکل­دهی برای هر دو نوع جنس مندرل برای لوله­هایی با قطر کم و شعاع انحنای بالا حاصل می­گردد. همچنین، با افزایش 30 درصدی شعاع خم برای لوله­های با قطر کمتر، نیروهای خمکاری 5 برابر می­شوند. ضمناً، در قطر و شعاع خم برابر، نیروهای خمکاری در حالت استفاده از مندرل پلی­یورتان 25 درصد بیشتر از مندرل نیتریل می­باشد.
کلیدواژه‌ها
خمکاری کششی-دورانی
شبیه سازی اجزای محدود
لوله SS-304
نیروی شکل دهی
توزیع ضخامت

موضوعات

عنوان مقاله English

Experimental and Numerical Study of Rotational Draw Bending Process of SS-304 Thin-walled Pipes Using Polyurethane and NBR Mandrels

نویسندگان English

Hamid Reza Ghahreman 1
Mohammad Honarpisheh 2
Mohammad Bagher Sarafrazi 3
1 MSc, Manufacturing Department, Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran
2 Associate Professor, Manufacturing Department, Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran
3 MSc, Manufacturing Department, Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran
چکیده English

One of the forming pipes methods is the rotary draw bending process. Today, bending of thin-walled pipes with low radius of curvature is widely used in the automotive, military and aerospace industries, which is used to bend high-strength pipes. In this paper, at first the necessary models were created to simulate the bending process of the rotary pipe, and then the necessary mechanical and physical properties for stainless steel 304 and elastomers were determined. Then, experimental and numerical study of the forming force and changes in pipe wall thickness were performed. The process simulation was analytically performed using polyurethane elastomeric mandrels and nitrile rubber based on ABAQUS finite element software on 304 steel. The results show a good agreement between simulation and experimental results. Finally, the effects of process parameters including mandrel type, pipe diameter and bending radius were analyzed on the maximum forming force by factorial analysis. The results showed that the maximum forming force for both types of mandrel materials is obtained for pipes with small diameter and high curvature radius. Also, the bending forces increase 5 times by 30%increasing the bending radius, for pipes with smaller diameters. In addition, in equal diameter and radius of bending, the bending forces in the case of using polyurethane mandrel are 25% more than nitrile mandrel.

کلیدواژه‌ها English

Rotary draw bending
FEM
SS-304 pipe
Forming force
thickness distribution
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مهندسی مکانیک مدرس
دوره 22، شماره 5
اردیبهشت 1401
صفحه 303-310