بهینه سازی با هدف بهترین زبری سطح و چگالی نسبی در فرایند ساخت افزایشی آلیاژ Ti6Al4V

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مکانیک، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران

2 هیات علمی گروه ساخت و تولید دانشگاه تربیت دبیر شهید رجایی تهران ایران

چکیده

یکی از پرکاربردترین روش‌های مدل‌سازی سریع، ذوب بستر پودری با استفاده از پرتوی لیزر است. متغیرهای متعددی در ساخت به این روش وجود دارد که می‌توان به  قدرت دستگاه، سرعت لیزر، زاویه چاپ و فاصله دو مسیر متوالی به عنوان مهمترین موارد نام برد. اعمال تغییر در موارد یاد شده تأثیر مستقیم بر عیوب و کیفیت نمونه ساخته شده دارد. فرایندهای تکمیلی مانند عملیات حرارتی نیز برای بهبود خواص و عملکرد قطعه به کار گرفته می‌شوند. انتخاب مناسب و درست متغیرهای ساخت و عملیات تکمیلی علاوه بر بهبود خواص قطعه می‌تواند سبب کاهش هزینه‌ها و زمان ساخت قطعه شود. در این مقاله با استفاده از الگوریتم ژنتیک متغیرهای بهینه برای دستیابی به بیشترین چگالی نسبی و کمترین زبری سطح معرفی می‌شوند. نتایج بهینه سازی حاکی از این است که بهترین نتایج با استفاده از، توان لیزر در محدوده 102 تا 105 وات، سرعت لیزر در محدوده 623 تا 630 میلیمتر بر ثانیه، فاصله دو مسیر متوالی در محدوده 76 تا 73 میکرون و دمای عملیات حرارتی 638 تا 640 درجه سانتی گراد به دست خواهد آمد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Optimization of Additive Manufactured Part Made by Ti6Al4V Alloy to Achieve Best Relative Density and Surface Roughness

نویسندگان [English]

  • amir hossein ghasemi 1
  • Valiollah Panahizadeh 2
1 Department of manufacturing, Faculty of mechanical engineering, Teacher training shahid Rajai university, Tehran, Iran
2 Department of Mechanical Engineering, Faculty of Mechanic, Shahid Rajaee Teacher Training University, Tehran, Iran
چکیده [English]

One of the most popular additive manufacturing techniques is called laser powder bed fusion. Several parameters are involved in this method and four of the most important factors are laser power, scanning speed, infill pattern angle, and hatch space. Change in this parameter has a direct effect on defects and fabricated parts quality. Post-processing treatment such as heat treatment was cared out in order to improve part property and applications. Built time and costs reduce significantly by suitable choice of process parameters and post-processing treatments. In this article genetic algorithm cared out to highest relative density and lowest surface roughness and best value of each parameter presented. The results showed that the best output could achieve by using 102-105 Watt of laser power, 623-630 mm.s-1 scan speed, 73-76 µm of hatch space, and 638-640 °C of heat treatment temperature.

کلیدواژه‌ها [English]

  • Additive Manufacturing
  • Relative density
  • Surface roughness
  • Powder bed fusion
  • genetic algorithm
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