تحلیل تئوری فرآیند ایکپ به روش کران بالا و بررسی تجربی آن در وضعیت مقطع دایروی کانال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران

2 استاد، گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

فرآیند ایکپ، یکی از موثرترین فرآیندهای تغییر شکل پلاستیکی شدید جهت تولید فلزات فوق ریزدانه است. نظریه کران بالا نیز یکی از ابزارهای تئوری قابل اعتماد جهت پیش‌بینی‌ تغییرشکل کرنشی و نیروی شکل‌دهی می‌باشد. در این تحقیق، تحلیل روش ایکپ با استفاده از نظریه کران بالا در زاویه کانال و گوشه دلخواه انجام و رابطه‌ا‌ی کلی و کاربرپسند جهت پیش‌بینی نیروی شکل‌دهی، بر اساس هندسه فرآیند و خواص الاستیک-پلاستیک ماده پیشنهاد گردید. با مقایسه‌ی مقدار نیروی به دست آمده از رابطه تئوری با مقدار تجربی حاصل از اعمال فرآیند روی آلیاژ آلومینیوم 7075، انطباق مناسبی بین نتایج مشاهده شد که این مهم قابلیت اعتماد به این رابطه را برای نیروی ایکپ تضمین می‌کند. بر اساس نتایج تحقیق حاضر، در ایکپ این ماده در شرایط زاویه کانال، زاویه گوشه، قطر و طول بیلت به ترتیب برابر °135، °20، mm 10 و mm 90 میزان نیروی شکل‌دهی در دو حالت تجربی و تئوری به ترتیب برابر kN 48 و kN 04/55 به دست آمد. همچنین با افزایش زاویه کانال از 60 به 150 درجه در زاویه گوشه ثابت 20 درجه، میزان نیروی فرآیند با % 41/3 کاهش از kN 86/4 به kN 50/7 تغییر یافت. با افزایش زاویه گوشه از صفر به 40 درجه در زاویه کانال ثابت 135 درجه نیز کاهشی قابل چشم پوشی به میزان % 2/5 از kN 56 به kN 54/6 مشاهده شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Theoretical Analysis of Equal Channel Angular Pressing Process by Upper Bound Method and Its Experimental Investigation in Condition of Circular Cross-Section Channel

نویسندگان [English]

  • Reza Naseri 1
  • Mehran Kadkhodayan 2
  • Mahmoud Shariati 2
1 Assistant Professor, Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran
2 Professor, Department of Mechanical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

The equal channel angular pressing process is one of the most effective severe plastic deformation processes to produce ultrafine grained steels metals. Also, the upper bound theory is one of the reliable theoretical tools to forecast deformation strain and forming load. In this research, analysis of equal channel angular pressing technique in an arbitrary channel and corner angles using upper-bound theory was performed and a general and user-friendly equation for predicting the forming force is proposed according to the geometry of process and elastic-plastic properties of work-piece material. By comparing the amount of obtained theoretical load with experimental forming force resulted from applying process on 7075 Al alloy, has been observed very good agreement between the results. This guarantees the reliability of the achieved general equation for equal channel angular pressing force. According to the results of the present research, experimental and theoretical forming load of equal channel angular pressing process on this material under conditions of channel angle 135°, corner angle 20°, billet diameter 10 mm, and billet length 90 mm were obtained equal to 48 kN and 55.04 kN, respectively. Furthermore, by increasing the channel angle from 60 to 150 under a constant corner angle of 20°, process load is decreased equal to 41.3% from 86.4 kN to 50.7 kN. In addition, by increasing the corner angle from 0° to 40° under a constant channel angle of 135°, the negligible reduction of a load equal to 2.5% was observed from 56 kN to 54.6 kN.

کلیدواژه‌ها [English]

  • Equal channel angular pressing
  • Upper-bound theorem
  • Elastic-plastic properties
  • Forming load

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 53، شماره 8
آبان 1400
صفحه 4729-4744

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