بررسی اثر ضریب اصطکاک بر نیروی شکل‌دهی ورق مسی در فرآیند پرسکاری در قالب‌های شیاردار مقید

نوع مقاله : مقاله علمی

نویسندگان
1 دکترای تخصصی، دانشیار مکانیک، دانشکده مهندسی، دانشگاه بیرجند، ایران
2 دانشجوی دکترا ، دانشگاه بیرجند، ایران
3 کارشناسی ارشد، دانشگاه آزاد دزفول، ایران
چکیده
روش‌های تغییر شکل پلاستیک شدید روش‌هایی هستند که می‌توان به کمک آن، موادی با نسبت استحکام به وزن بالا تولید نمود. فرآیند پرس‌کاری شیاری، یک روش تغییر شکل پلاستیک شدید است که به منظور تولید ورق‌های فلزی با ساختار بسیار ریزدانه بکار گرفته می‌شود. در این تحقیق به صورت عددی و با استفاده از روش اجزاء محدود فرآیند پرسکاری شیاری محدود تا یک پاس کامل بر روی نمونه‌ی مسی خالص مورد مطالعه قرار می‌گیرد. لذا بوسیله‌ی نرم‌افزار 6-14 ABAQUS مدل‌سازی عددی انجام شد که با استفاده از این روش نتایج خروجی هرمرحله به عنوان ورودی مرحله بعد منتقل می‌شود. نتایج عددی نشان داد که با اعمال هر مرحله از فرآیند (Constrained Groove Pressing) میزان کرنش پلاستیک بیشتر می‌شود و همچنین در راستای طول نمونه میزان کرنش موثر پلاستیک به صورت نوسانی تغییر می‌کند.‌ با بررسی تغییرات نیروی شکل‌دهی حین فرآیند مشاهده شد روند تغییرات نیرو در مراحل فرد شامل سه بخش است و در بخش سوم شیب تغییرات نیرو به شدت افزایش می‌یابد که دلیل آن افزایش سطوح تماس و اثر اصطکاک به منظور پر شدن گوشه‌های قالب است. با بررسی اثر ضریب اصطکاک بر روی نیروی شکل‌دهی مشاهده گردید با افزایش ضریب اصطکاک مقدار ماکزیمم نیروی شکل‌دهی بیشتر می‌شود. 
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigating the effect of friction coefficient on the forming force of copper sheet in the pressing process in bound groove molds

نویسندگان English

Saeed Rahnama 1
Moein Gholami 2
Payam Askari 2
Abas Yaghoobzad 3
1 Department of Mechanical Engineering , University of Birjand , Tehran University , Iran.
2 Department of Mechanical Engineering , University of Birjand , Tehran University , Iran.
3 Department of Mechanical Engineering , University of Birjand , Tehran University , Iran.
چکیده English

Extreme plastic deformation methods are methods that can be used to produce materials with a high strength-to-weight ratio. Groove pressing process is a severe plastic deformation method used to produce metal sheets with very fine grain structure. In this research, numerically and using the finite element method, the groove pressing process is studied up to one full pass on a pure copper sample. Therefore, numerical modeling was done by ABAQUS 6-14 software, and by using this method, the output results of each stage are transferred as input to the next stage. Numerical results showed that with the application of each step of the process (Constrained Groove Pressing), the amount of plastic strain increases and also along the length of the sample, the amount of effective plastic strain changes in an oscillating manner. By examining the changes in the forming force during the process, the trend of force changes was observed. It consists of three parts in odd stages, and in the third part, the slope of force changes increases sharply, which is due to the increase of contact surfaces and the effect of friction in order to fill the corners of the mold. By examining the effect of the friction coefficient on the forming force, it was observed that with the increase of the friction coefficient, the maximum value of the forming force increases.

کلیدواژه‌ها English

Modeling
Copper sheet
Hardness
Forming force
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  • تاریخ دریافت 18 اردیبهشت 1403
  • تاریخ بازنگری 23 شهریور 1403
  • تاریخ پذیرش 28 بهمن 1402
  • تاریخ اولین انتشار 28 بهمن 1402
  • تاریخ انتشار 01 بهمن 1402