طراحی و ساخت ترانسدیوسر و ابزار التراسونیک در فرایند جوشکاری اغتشاشی اصطکاکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران

2 کاشان بلوار قطب راوند دانشگاه کاشان

چکیده

جوشکاری اغتشاشی اصطکاکی در زمره روش های اتصال دائم است که به دلیل ماهیت ترمومکانیکال اتصال مواد در حالت نیمه جامد و نیروهای جوشکاری بالا، نیازمند ابزار، گیره بندی و ماشین ابزار بسیار مستحکم است. راهکار ترکیب این فرایند با ارتعاش التراسونیک، کاهش نیروهای جوشکاری و بهبود کیفیت اتصال را به همراه دارد. در این تحقیق، ایده نحوه مقایسه اعمال دو نوع ارتعاش التراسونیک محوری و خمشی بر فرایند جوشکاری اغتشاشی اصطکاکی، منجر به ساخت مجموعه ابزار جوشکاری اغتشاشی اصطکاکی و ترانسدیوسر التراسونیک منحصربه فردی گردید. در واقع یکی از اهداف این پژوهش طراحی یگانه ابزاری است که قابلیت ارتعاش در دو مود محوری و خمشی در دو فرکانس مختلف را دارا باشد. همچنین اثرات تغییر جرم و اینرسی مجموعه ابزار بر جوش به دلیل استفاده از مجموعه ابزارهای جداگانه برای هر مود فرکانسی، حذف گردد. در نهایت، مدل نهایی آنالیز مودال شده ساخته شد و تحت اندازه گیری تجربی دامنه ارتعاشات در فرکانس رزونانس دو مود محوری و خمشی قرار گرفت و تأثیر دامنه ارتعاشات در این دو مود به صورت آزمایشگاهی بررسی شد. برتری استفاده از ارتعاش خمشی نسبت به ارتعاش محوری در جهت حصول جوش با کیفیت بالاتر را می توان یکی از نتایج این مطالعه برشمرد. همچنین دو برابر شدن دامنه ارتعاشات از 8 به 16 میکرومتر برای جوشکاری ارتعاشی در مود خمشی، تقویت استحکام اتصال را به همراه داشت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Manufacturing a Single Ultrasonic Tool Set of Vibrational friction stir welding in Bending and Axial Modes

نویسندگان [English]

  • A. Rezaei Shahreza 1
  • S. Amini 2
1 Department of Mechanical Engineering, Kashan University, Kashan, Iran
2
چکیده [English]

Friction stir welding has been categorized amongst permanent joining methods. Since its thermomechanical nature, solid-state joining and high welding loads, Friction stir welding process needs sturdy tools, fixture, and machine tool. Combination of this process along with ultrasonic vibrations decreases welding loads and improves the weld quality. In this study, the idea of comparing superimposed axial and bending ultrasonic vibrational modes on friction stir welding process led to producing a unique set of friction stir welding tool along with an ultrasonic transducer. In fact, one of the aims of this study concerns designing a single ultrasonic assisted friction stir welding tool set which will be able to vibrate in both axial and bending modes separately in different frequencies. In addition, the impressive effects of mass and inertia variations on the weld, due to the usage of the distinct tool set for each modal frequency, will be removed. The final modal analyzed model was manufactured and the amplitude of vibrations in both mentioned modes was measured experimentally. Results indicated that the use of bending vibrations leads to the formation of joints with much more quality than implementing the axial vibrations. Furthermore, doubled amplitudes from 8 μm to 16 μm in bending mode, unlike axial mode, improved the weld ultimate tensile strength.

کلیدواژه‌ها [English]

  • Ultrasonic transducer
  • Ultrasonic assisted friction stir welding
  • Axial and bending modes
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