مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تاثیر فرایند ماشینکاری(تراشکاری) برودتی فولاد زنگ‌نزن AISI 440C بر زبری سطح، سختی، شکل‌شناسی براده و طول عمر ابزار

نوع مقاله : پژوهشی اصیل

نویسندگان
دانشگاه کاشان
چکیده
مقدار بالای نیتروژن در ترکیب فولاد زنگ­نزن مارتنزیتی AISI 440C گرچه منجر به بهبود مقاومت به خوردگی می­شود، ولی به دلیل افزایش سختی، قابلیت ماشینکاری این نوع فولاد را کاهش داده و باعث تولید حرارت زیاد در لبه برنده و منطقه تماس براده و ابزار هنگام براده­برداری می­شود. استفاده از فن­آوری­های نوین خنک­کاری مانند ماشینکاری برودتی با استفاده از نیتروژن مایع LN2، منجر به افزایش طول عمر ابزار، بهبود سرعت برشی و نرخ برداشت مواد نسبت به سایر روش­های متداول خنک­کاری همچون سیال برشی و MQL می­شود. در این تحقیق تاثیر فرایند ماشینکاری برودتی فولاد زنگ­نزن AISI 440C بر زبری سطح، سختی سطحی و پروفیل سختی در عمق، شکل­شناسی براده و الگوی سایش ابزار در مقایسه با ماشینکاری خشک مورد بررسی قرار می­گیرد. نتایج نشان داد با استفاده از ماشینکاری برودتی زبری سطح فولاد زنگ­نزن AISI 440C حتی در سرعت پیشروی بالا به میزان قابل­توجهی کاهش و صافی سطح بهبود یافته است. در مبحث شکل­شناسی براده مشخص شد با تسهیل شرایط ماشینکاری در فرایند برودتی در یک سرعت برشی و سرعت پیشروی یکسان، میزان سوختگی سطحی براده و میزان چروکیدگی و انباشت مواد در سطح داخلی براده به طور قابل توجهی کاهش یافته است. در این تحقیق مشخص شد الگوی سایش ابزار در ماشینکاری برودتی، گودال فرسایش در سطح براده بوده و باعث افزایش 400 درصدی طول عمر ابزار در شرایط یکسان ماشینکاری نسبت به روش خشک شده است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Effect of Cryogenic Machining(turning) of AISI 440C Stainless Steel on Roughness, Hardness, Chip Morphology and Tool Wear Pattern

نویسندگان English

I. Mozaffari
saeid amini
University Of Kashan
چکیده English

The high amount of nitrogen in the composition of AISI 440C stainless steel reduces the machinability of this steel due to the increase in hardness and generates high heat at the cutting edge and the chip-tool contact area. The use of new cooling technologies such as cryogenic machining using liquid nitrogen LN2, leads to increase the life of the tool and improve the cutting speed compared to other common methods. In this research, the effect of cryogenic machining is investigated on roughness and hardness of AISI 440C stainless steel. The results showed that using cryogenic machining, the surface roughness of AISI 440C stainless steel was significantly reduced even at high feed rate. The morphology of the chips showed that with the use of cryogenic machining, the surface burn and the accumulation of materials on the inner surface of the chips has been significantly reduced. In this study, it was found that in cryogenic machining, the tool wear pattern is the erosion pit on the chip surface and has increased the tool life by 400% compared to the dry machining.

کلیدواژه‌ها English

Cryogenic Machining
Liquid nitrogen
AISI 440C Stainless Steel
Roughness
Hardness
Tool wear
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