مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

مطالعه تجربی نیروها و انرژی مخصوص در سنگ‌زنی کامپوزیت سیلیکون کارباید تقویت‌شده با فیبر کربن با روش های مختلف روانکاری

نویسندگان
حامد اسماعیلی 1
حامد ادیبی 1
مهدی رضاعی 2
1 دانشکده مهندسی مکانیک، دانشگاه صنعتی امیرکبیر، تهران
2 دانشکده مهندسی مکانیک، دانشگاه صنعتی امیر کبیر، تهران
چکیده
کامپوزیت‌های پایه سرامیکی دسته جدیدی از مواد با تکنولوژی پیشرفته هستند که می‌توانند جایگزین مناسبی برای سوپر آلیاژهای فلزی باشند. این کامپوزیت‌ها به دلیل خصوصیات برجسته شامل وزن خیلی پایین، سختی و چقرمگی نسبتا بالا و مقاومت به خوردگی و سایش زیاد کاربردهای گسترده‌ای در صنایع مدرن پیدا کرده‌اند. به دلیل سختی بالا و ساختار ناهمگون، فرآیند سنگ‌زنی این کامپوزیت‌ها ناپایدار و همراه با نیروها و دماهای بالا در حین فرآیند ماشینکاری است. هدف این پژوهش غلبه بر مشکل سنگ‌زنی این کامپوزیت‌ها با تحلیل و شناخت تاثیر پارامترهای عمده سنگ‌زنی شامل سرعت برش، سرعت پیشروی و عمق بار بر نیروها، انرژی مخصوص و نسبت نیروی سنگ‌زنی در سه محیط مختلف شامل سنگ‌زنی خشک، سنگ‌زنی با سیال برشی و روش روانکاری کمینه می‌باشد. برای ارزیابی معنی‌دار بودن تاثیر پارامترهای ورودی بر پاسخ‌ها و همچنین به دست‌آوردن معادلات پیش‌بینی از آنالیز واریانس استفاده گردید. نتایج نشان داد که روش روانکاری کمینه موثرترین روش روانکاری و خنک‌کاری می‌باشد بطوریکه موجب کاهش نیروهای مماسی سنگ‌زنی به میزان 38.88% و نیروهای عمودی به مقدار 31.16% نسبت به سنگ زنی خشک می گردد، در حالیکه مقادیر کاهش نیروها در سنگ زنی با سیال برشی برابر 34.22% برای نیروهای مماسی و 24.81% برای نیروهای عمودی نسبت به سنگ زنی خشک است. همچنین ملاحظه گردید که افزایش سرعت برش باعث کاهش نیروها و نسبت نیروی سنگ‌زنی و افزایش انرژی مخصوص می‌گردد در حالیکه افزایش سرعت پیشروی و عمق بار باعث افزایش نیروها و نسبت نیروی سنگ‌زنی و کاهش انرژی مخصوص می‌شود.
کلیدواژه‌ها
کامپوزیت پایه سرامیکی
نیروی سنگ زنی
روانکاری کمینه
سنگ زنی با سیال برش
سنگ زنی خشک

عنوان مقاله English

Experimental study on grinding forces and specific energy in three different environments of grinding carbon fiber reinforced silicon carbide composite

نویسندگان English

hamed esmaeili 1
hamed adibi 1
seyed mehdi rezaei 2
1 department of mechanical engineering, Amirkabir university of technology, Tehran, Iran
2 department of mechanical engineering, Amirkabir university of technology
چکیده English

Ceramic matrix composites (CMCs) are a new class of high technology materials which can be utilized as a replacement for metallic super-alloys. CMCs have a vast array of applications in modern industries due to their upstanding properties, including low density, relatively high hardness and fracture toughness, and high corrosion and wear resistance. Extremely high hardness and inhomogeneous structure of CMCs cause unstable process and high grinding forces and temperature. This research was conducted in order to overcome the grinding challenges of these composites by recognizing and analyzing the effects of main process parameters comprising cutting speed, feed speed, and depth of cut on the grinding forces, specific energy, and grinding force ratio in three different environments including dry, wet and MQL grinding. To evaluate the significance of input parameters and their influence on the responses and also to derive predicting equations, Analysis of Variance (ANOVA) was employed. It was concluded that MQL technique is the most efficient cooling-lubrication method where implementation of this process reduces the tangential grinding force by 38.88% and normal grinding force by 31.16%, relative to dry grinding; however, the amount of force reduction in wet grinding is 34.22% for tangential grinding force and 24.81% for normal grinding force, relative to dry grinding. In addition, increase of cutting speed leads to reduced grinding forces and force ratio and higher amounts of specific energy, and also increase of feed speed and depth of cut cause higher grinding forces and force ratio and lower amounts of specific energy.

کلیدواژه‌ها English

Ceramic matrix composite
grinding forces
minimum quantity lubrication
fluid grinding
dry grinding
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مهندسی مکانیک مدرس
دوره 18، شماره 1
فروردین 1397
صفحه 379-387