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تاثیر توان لیزر و سرعت روبش بر دقت ساختاری قطعات پلیمری تولید شده به وسیله چاپگر سه بعدی ذوب لیزری انتخابی | ||
| مدل سازی در مهندسی | ||
| دوره 23، شماره 82، مهر 1404، صفحه 115-126 اصل مقاله (714.09 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22075/jme.2025.34924.2713 | ||
| نویسندگان | ||
| سیدطاها خادمیان؛ علی اصغر عجمی* | ||
| دانشکده فیزیک، دانشگاه سمنان، سمنان، ایران | ||
| تاریخ دریافت: 11 مرداد 1403، تاریخ بازنگری: 21 فروردین 1404، تاریخ پذیرش: 23 اردیبهشت 1404 | ||
| چکیده | ||
| ساخت افزایشی که همچنین با نام چاپ سهبعدی شناخته میشود، روش جدیدی برای تولید ساختارهای پیچیده سه بعدی است. در چاپگر بر مبنای گداخت بستر پودر نواحی مشخصی از پودر مواد تحت تابش لیزر ذوب و سپس جامد میشود. در این پژوهش پارامترهای مرتبط با چاپگر ذوب/تفجوشی لیزری انتخابی (SLM/SLS) به طور تجربی و عددی بررسی میشود. از آنجاییکه چشمههای نوری مورد استفاده در چاپگر سهبعدی SLS لیزر پیوسته یا لیزر پالس بلند میباشند درنتیجه تولید و هدایت گرما فرآیند اصلی حاصل از برهمکنش تابش با ماده میباشد. از اینرو از معادله هدایت گرما برای شبیه سازی برهم کنش در نرمافزارکامسول استفاده میشود. برای ساخت بر مبنای گداخت بستر پودر از پودر پلاستیکی پلیاتیلن HDPE 3840UA به عنوان ماده تحت فرآیند و از یک لیزر دیودی با طول موج 450 nm و توان W 4 به عنوان چشمه لیزری استفاده میشود. از آنجایی که جذب پلیاتیلن خالص در طول موج nm 450 خیلی کم است، مخلوط آن با پودر گرافیت به عنوان افزودنی جاذب مورد استفاده قرار میگیرد. تاثیر دو پارامتر مهم در چاپ سهبعدی، توان لیزر مورد استفاده و سرعت روبش باریکه لیزری، بر کیفیت ذوب و پهنای خطوط جامد تولید شده از پودر پلیاتیلن بررسی میشود. نتیجه بررسیها نشان داد که برای توان لیزری پایین در حدود W 0.3 سرعت روبش باید کمتر از mm/Min 600 تنظیم گردد و برای سرعت روبش نسبتا زیاد در حدود mm/Min 3000 توان لیزری بیش از W 2 نیاز است. خارج از این محدوده توان-سرعت هیچ ذوب یا حتی تفجوشی رخ نمیدهد. | ||
| کلیدواژهها | ||
| ساخت افزودنی؛ چاپگر سهبعدی؛ ذوب لیزری انتخابی؛ تفجوشی لیزری انتخابی؛ دقت ساختاری؛ شار آستانه | ||
| عنوان مقاله [English] | ||
| Effect of Laser Power and Scanning Speed on the Structural Resolution of Polymeric parts Produced by Selective Laser Melting 3D Printer | ||
| نویسندگان [English] | ||
| Seyed Taha Khademian؛ Aliasghar Ajami | ||
| Faculty of physics, Semnan University, Semnan, Iran | ||
| چکیده [English] | ||
| Additive manufacturing, also known as 3D printing, is an innovative method for building complex 3D structures. One of the primary 3D printing techniques is powder bed fusion in which, specific areas of a thin layer of powder material are irradiated by a laser to melt or sinter the material, which then solidifies. In this research, the parameters related to selective laser melting/sintering (SLM/SLS) are investigated both experimentally and numerically. Since the lasers used in SLS 3D printers are typically continuous wave (CW) or long-pulse lasers, heat generation and conduction are the main processes resulting from light-matter interaction. Therefore, the heat conduction equation is employed to simulate the interaction process and determine the temporal and spatial behavior of temperature using COMSOL software. A diode laser with a wavelength of 450 nm and maximum power of 4 W is used for experiment. Polyethylene plastic powder (HDPE 3840UA) is utilized for SLM/SLS structuring. Since the absorption of pure polyethylene at 450 nm is very low, it is mixed with a portion of graphite to serve as an absorptive additive. The effects of the two main parameters of 3D printing, laser power and scanning speed, on the width of solid lines printed via SLM/SLS are investigated experimentally and numerically. The results of investigation show that for a low laser power of about 0.3 W, the scanning speed should be set below 600 mm/min, and for a high scanning speed of 3000 mm/min, the laser power should exceed 2 W. Beyond these ranges, no SLM/SLS will occur. | ||
| کلیدواژهها [English] | ||
| Additive manufacturing, 3D printer, Selective laser melting, Selective laser sintering, Structural resolution, Critical fluence | ||
| مراجع | ||
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