بررسی رفتار سایشی فولاد گرافیتی در فرآیند کوبش فراصوتی

Abstract

<span lang="AR-SA" dir="RTL">مقاومت</span><span lang="AR-SA"> <span dir="RTL">به</span> <span dir="RTL">سایش</span> <span dir="RTL">جهت</span> <span dir="RTL">افزایش</span> <span dir="RTL">طول</span> <span dir="RTL">عمر</span> <span dir="RTL">غلتک­ ها</span> <span dir="RTL">بسیار</span> <span dir="RTL">حائز</span> <span dir="RTL">اهمیت</span> <span dir="RTL">است</span> <span dir="RTL">لذا</span> <span dir="RTL">در</span> <span dir="RTL">این</span> <span dir="RTL">تحقیق</span> <span dir="RTL">برای</span> <span dir="RTL">تعیین</span> <span dir="RTL">سایش غلتک</span> <span dir="RTL">های</span> <span dir="RTL">نورد</span> <span dir="RTL">از</span> <span dir="RTL">جنس</span> <span dir="RTL">فولاد</span> <span dir="RTL">گرافیتی،</span> <span dir="RTL">از</span> <span dir="RTL">روش</span> <span dir="RTL">تست</span> <span dir="RTL">سایش</span> <span dir="RTL">و</span> <span dir="RTL">تعیین</span> <span dir="RTL">ضریب</span> <span dir="RTL">اصطکاک</span> <span dir="RTL">استفاده</span> <span dir="RTL">شد</span></span><span>. <span lang="AR-SA" dir="RTL">در</span><span lang="AR-SA"> <span dir="RTL">فناوری</span> <span dir="RTL">کوبش فراصوتی،</span> <span dir="RTL">ایجاد</span> <span dir="RTL">کار</span> <span dir="RTL">سختی</span> <span dir="RTL">و</span> <span dir="RTL">فشردگی</span> <span dir="RTL">در</span> <span dir="RTL">لایه</span> <span dir="RTL">های</span> <span dir="RTL">سطحی</span> <span dir="RTL">قطعه</span> <span dir="RTL">کار</span> <span dir="RTL">باعث</span> <span dir="RTL">بهبود</span> <span dir="RTL">برخی</span> <span dir="RTL">خواص</span> <span dir="RTL">مکانیکی</span> <span dir="RTL">از</span> <span dir="RTL">جمله</span> <span dir="RTL">صافی</span> <span dir="RTL">سطح، سختی</span> <span dir="RTL">و</span> <span dir="RTL">استحکام</span> <span dir="RTL">می</span> <span dir="RTL">شود</span></span>. <span lang="AR-SA" dir="RTL">با</span><span lang="AR-SA"> <span dir="RTL">شبیه</span> <span dir="RTL">سازی</span> <span dir="RTL">و</span> <span dir="RTL">ساخت</span> <span dir="RTL">ابزار</span> <span dir="RTL">ارتعاشی</span> <span dir="RTL">فراصوتی</span> <span dir="RTL">و</span> <span dir="RTL">نصب</span> <span dir="RTL">آن</span> <span dir="RTL">بر</span> <span dir="RTL">روی</span> <span dir="RTL">دستگاه</span> <span dir="RTL">تراش،</span> <span dir="RTL">عملیات</span> <span dir="RTL">کوبش فراصوتی</span> <span dir="RTL">بر</span> <span dir="RTL">روی</span> <span dir="RTL">نمونه</span> <span dir="RTL">های</span> <span dir="RTL">آماده</span> <span dir="RTL">شده</span> <span dir="RTL">از</span> <span dir="RTL">غلتک</span> <span dir="RTL">های</span> <span dir="RTL">نورد</span> <span dir="RTL">انجام</span> <span dir="RTL">گرفت</span></span>. <span lang="AR-SA" dir="RTL">در</span><span lang="AR-SA"> <span dir="RTL">آزمایش</span> <span dir="RTL">سایش،</span> <span dir="RTL">مقاومت</span> <span dir="RTL">به</span> <span dir="RTL">سایش</span> <span dir="RTL">در</span> <span dir="RTL">نمونه</span> <span dir="RTL">بعد</span> <span dir="RTL">از عملیات</span> <span dir="RTL">بهبود</span> <span dir="RTL">یافت</span></span>. <span lang="AR-SA" dir="RTL">همچنین</span><span lang="AR-SA"> <span dir="RTL">نتایج</span> <span dir="RTL">مبین</span> <span dir="RTL">کاهش</span> <span dir="RTL">ضریب</span> <span dir="RTL">اصطکاک</span> <span dir="RTL">در</span> <span dir="RTL">حدود</span></span> 50 <span lang="AR-SA" dir="RTL">درصد</span><span lang="AR-SA"> <span dir="RTL">بعد</span> <span dir="RTL">از</span> <span dir="RTL">عملیات</span> <span dir="RTL">می</span> <span dir="RTL">باشد</span></span>. <span lang="AR-SA" dir="RTL">با</span><span lang="AR-SA"> <span dir="RTL">تهیه</span> <span dir="RTL">گراف پروفیل</span> <span dir="RTL">سطح</span> <span dir="RTL">از</span> <span dir="RTL">سطح</span> <span dir="RTL">سایش</span> <span dir="RTL">مشخص</span> <span dir="RTL">شد</span> <span dir="RTL">بعد</span> <span dir="RTL">از</span> <span dir="RTL">عملیات</span> <span dir="RTL">عرض</span> <span dir="RTL">و</span> <span dir="RTL">عمق</span> <span dir="RTL">سایش</span> <span dir="RTL">کمتر</span> <span dir="RTL">می</span> <span dir="RTL">باشد</span></span>. <span lang="AR-SA" dir="RTL">تصاویر</span><span lang="AR-SA"> <span dir="RTL">میکروسکوپ</span> <span dir="RTL">الکترونی</span> <span dir="RTL">از سطح</span> <span dir="RTL">سایش</span> <span dir="RTL">نمونه</span> <span dir="RTL">های</span> <span dir="RTL">قبل</span> <span dir="RTL">و</span> <span dir="RTL">بعد</span> <span dir="RTL">از</span> <span dir="RTL">عملیات</span> <span dir="RTL">تهیه</span> <span dir="RTL">شد</span> <span dir="RTL">و</span> <span dir="RTL">مکانیزم</span> <span dir="RTL">سایش</span> <span dir="RTL">مورد</span> <span dir="RTL">بررسی</span> <span dir="RTL">قرار</span> <span dir="RTL">گرفت</span> <span dir="RTL">که</span> <span dir="RTL">مکانیزم</span> <span dir="RTL">چسبان</span> <span dir="RTL">و</span> <span dir="RTL">خستگی سطحی</span> <span dir="RTL">قبل</span> <span dir="RTL">از</span> <span dir="RTL">عملیات</span> <span dir="RTL">و</span> <span dir="RTL">مکانیزم</span> <span dir="RTL">خراشان</span> <span dir="RTL">بعد</span> <span dir="RTL">از</span> <span dir="RTL">عملیات</span> <span dir="RTL">مشاهده</span> <span dir="RTL">شد</span></span> . <span lang="AR-SA" dir="RTL">با</span><span lang="AR-SA"> <span dir="RTL">انجام</span> <span dir="RTL">فرآیند</span> <span dir="RTL">بر</span> <span dir="RTL">روی</span> <span dir="RTL">سطح</span> <span dir="RTL">غلتک های</span> <span dir="RTL">مقاومت</span> <span dir="RTL">به سایش،</span> <span dir="RTL">استحکام،</span> <span dir="RTL">صافی</span> <span dir="RTL">سطح</span> <span dir="RTL">و</span> <span dir="RTL">طول</span> <span dir="RTL">عمر</span> <span dir="RTL">آنها</span> <span dir="RTL">افزایش</span> <span dir="RTL">می</span> <span dir="RTL">یابد</span></span>.</span>