مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

یکپارچگی سطح قطعه‌کار و سایش ابزار در فرآیند فرزکاری با تکنیکهای مقدار روانکاری کمینه و خشک روی فولاد 304L

نوع مقاله : پژوهشی اصیل

نویسندگان
آریا تاج الدین
امیر حسین رنجبر
بهزاد جباری پور
دانشگاه آزاد اسلامی، واحد تهران مرکزی
10.22034/MME.24.3.131
چکیده
این تحقیق به بررسی سایش ابزار، آنالیز عنصری روی سطح ماشینکاری، زبری سطح قطعه­کار، تغییرات ریزسختی و تغییرات ریزساختاری در سطح مقطع عرضی نمونه­های فرزکاری شده فولاد ضدزنگ L304 تحت روشهای خشک و روانکاری کمینه (MQL) می­پردازد. فرآیند MQL توانسته است زبری سطح ماشینکاری را برای تمام پارامترهای فرزکاری، از 17% تا 41% نسبت به حالات متناظر ماشینکاری خشک، بهبود بخشد. در ماشینکاری خشک، عیوبی نظیر لبه‌ انباشته، سایش شدید سطح آزاد و لب­پر شدگی ابزار ایجاد شدند. در فرزکاری MQL این عیوب کاهش چشمگیری داشتند و لب­پر شدگی روی سطح ابزار تقریبا حذف شده ‌است. با افزایش سرعت برشی و عمق برشی، سختی سطحی افزایش یافته است. روش MQL نسبت به خشک، باعث کمتر شدن مقادیر سختی و عمق سخت­شده زیر سطح ماشینکاری می­شود. بر اساس نتایج آنالیز عنصری EDAX روی سطوح ماشینکاری شده خشک و MQL، تحت خشن­ترین پارامترهای برشی مشخص شد که هیچگونه تغییر عناصر شیمیایی در سطح ماشینکاری رخ نداده است. افزایش پارامترهای برشی و یا ماشینکاری خشک، سبب تشدید تغییر شکل پلاستیک، لهیده شدن ریزساختار و فشرده شدن دانه­های ریزساختاری در مجاورت سطح ماشینکاری می‌شود. حداکثر مقدار کاهش ضخامت لایه تغییر شکل یافته در فرزکاری MQL نسبت به خشک 39% است. برای هر نمونه فرزکاری، بین عمق سخت شده و ضخامت لایه تغییر شکل یافته ریزساختاری متناظرش، یک رابطه مستقیم وجود دارد.
کلیدواژه‌ها
فولاد ضدزنگ
فرزکاری
مقدار روانکاری کمینه
یکپارچگی سطح
سایش ابزار

موضوعات

عنوان مقاله English

Surface Integrity and Tool Wear in Milling Process Using Minimum Quantity Lubrication and Dry Techniques on 304L Steel

نویسندگان English

Aria Tajoddin
Amir Hossein Ranjbar
Behzad Jabbaripour
Central Tehran Branch, Islamic Azad University
چکیده English

This research investigates tool wear, elemental analysis (EDAX) on the machined surface, surface roughness, microhardness and microstructural changes in the cross-section of milled 304L stainless steel samples under dry and Minimum quantity lubrication (MQL) methods. The MQL process was able to improve the surface roughness for all milling parameters from 17% to 41% compared to the corresponding dry conditions. In dry machining, defects such as built up edge, severe flank wear and tool chipping were created. In MQL mode, these defects were significantly reduced and tool chipping was almost eliminated. By increase of cutting speed and depth, the surface hardness has increased. Compared to the dry method, the MQL reduces the hardness values and hardened depth below the machined surface. According to EDAX analysis on dry and MQL machined surfaces, applying the roughest cutting parameters, it was determined that no change of chemical elements occurred on machined surfaces. Increasing cutting parameters or dry machining causes the plastic deformation to intensify, the microstructure is flattened and the microstructure grains are compressed in the vicinity of the machined surface. The maximum reduction in thickness of deformed layer in MQL compared to dry method is 39%. For each milling sample, there is a direct relationship between the hardened depth and thickness of the corresponding microstructurally deformed layer.

کلیدواژه‌ها English

stainless steel
milling
minimum quantity lubrication
Surface integrity
Tool wear
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مهندسی مکانیک مدرس
دوره 24، شماره 3
اسفند 1402
صفحه 131-140