تحلیل تجربی فرآیند نورد سطحی به‌همراه ارتعاشات فراصوت

کی منش, محمد; رضوی, حامد

تحلیل تجربی فرآیند نورد سطحی به‌همراه ارتعاشات فراصوت

نویسندگان

دانشکده مهندسی مکانیک دانشگاه فنی و مهندسی گلپایگان

چکیده

فرآیند نورد سطحی بههمراه ارتعاشات فراصوت (UASR)، یکی از برجستهترین روشهای تغییرشکل پلاستیک شدید و ایجاد ساختار ریزدانه میباشد. هدف از این مقاله این است که تأثیر ارتعاشات فراصوت در فرآیند نورد سطحی، بهطور تجربی مورد بررسی قرار گیرد. در این راستا، هورن موردنظر جهت ارتعاش مود طولی طراحی و ساخته شد که در آن هورن (ابزار) میتواند با اعمال فشار استاتیک و همچنین ضربات دینامیکی، در خواص مکانیکی سطح فلز، تغییر ایجاد کند. آزمون تجربی برای سه نمونه CK15، CK45 و CK60 (کم کربن، متوسط کربن و پرکربن) با حضور و بدون حضور ارتعاشات فراصوت انجام گردید. میکرو سختی سطحی نمونهها بعد از انجام فرآیند UASR، نسبت به حالت معمولی مورد بررسی قرار گرفت. نتایج حاصل از این مطالعه نشان داد هرچه فشار استاتیک بالاتر باشد، میکرو سختی سطحی نمونهها افزایش بیشتری مییابد، ضمن اینکه اعمال ارتعاشات فراصوت در فرآیند UASR نیز میتواند میکرو سختی سطحی را با افزایش قابل توجهی مواجه نماید. از طرفی مشاهدات تجربی نشان داد که اثرگذاری ارتعاشات فراصوت بر فرآیند نورد سطحی، در نمونههای پرکربن بیشتر است. سپس طی مقایسهای نسبی، عمر خستگی برای سهجنس ذکرشده، با دامنههای ارتعاشی مختلف بررسی شد که بهبود عمر نسبی خستگی در فرآیند UASR خصوصا در دامنههای ارتعاشی بالاتر نشان داده شده است.

کلیدواژه‌ها

20.1001.1.26455323.1398.15.2.10.9

عنوان مقاله [English]

Experimental Study of Ultrasonic Assisted Surface Rolling Process

نویسندگان [English]

mohammad key manesh
hamed razavi

golpaygan

چکیده [English]

Ultrasonic assisted surface rolling (UASR) process is one of the most prominent methods to create severe plastic deformation and fine-grained structures. The aim of this paper is to study the ultrasonic vibration effects in surface rolling process, experimentally. In this regard, the desired horn was designed and manufactured in order to vibrate at longitudinal mode, which the proposed horn is able to change the mechanical properties of the metal surface by applying static pressure and dynamic impacts. Experimental tests were performed for three samples: CK15, CK45 and CK60 (Low, medium and high carbon) with and without applying ultrasonic vibrations. Micro surface hardness tests of samples were compared before and after UASR. The results showed that the higher static pressure leads to the higher micro surface hardness of samples. In addition, the use of ultrasonic vibrations in UASR can cause considerable rise in micro surface hardness. Based on the experimental results, it was found that, applying ultrasonic vibrations in surface rolling process are more effectiveness specifically in high carbon samples. Fatigue life investigation in various amplitudes showed the relative fatigue life improved in UASR process, especially in high vibrations amplitudes.

کلیدواژه‌ها [English]

Ultrasonic Assisted Surface Rolling Process
UASR
Micro Surface Hardness
Relative Fatigue Life

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