نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، دانشکده مکانیک، دانشگاه کاشان، ایران

2 دانشیار، دانشکده مهندسی مکانیک ،دانشگاه کاشان، کاشان، ایران

چکیده

کامپوزیت‌های تقویت‌شده با الیاف شیشه به‌علت خواص مکانیکی و فیزیکی مناسب آن‌ها دارای کاربردهای صنعتی متعددی هستند. سوراخ‌کاری از جمله روش‌های رایج برای ایجاد اتصال بین سازه‌های از جنس مواد تقویت­شده با الیاف می‌باشد. فرآیند ماشین‌کاری مافوق‌صوت دوار از روش‌های نوین در ماشین‌کاری کامپوزیت‌های تقویت­شده با الیاف می­باشد که در سال‌های اخیر بسیار مورد توجه قرار گرفته است. لایه­های کامپوزیت‌های تقویت­شده با الیاف در عملیات ماشین‌کاری مخصوصاً در عملیات سوراخ‌کاری که در معرض تمرکز تنش قرار می‌گیرند، دچار آسیب لایه­لایه­شدگی می‌شوند. پدیده لایه­لایه­شدگی به‌شدت تحت تاثیر عواملی مانند جنس و هندسه ابزار و همچنین پارامترهای ماشین‌کاری قرار دارد. از این رو در سال‌های اخیر از ابزارهای جدید مانند ابزار الماسه هسته­دار با توجه به کاهش نیرو و انجام هم‌زمان عملیات سوراخ‌کاری و سنگ‌زنی داخل سوراخ، در سوراخ‌کاری کامپوزیت‌های تقویت شده با الیاف، استفاده می­کنند. در این پژوهش به بررسی میزان لایه­لایه­شدگی در کامپوزیت تقویت­شده با الیاف شیشه (GFRP) با درصد الیاف 65% در فرآیند ماشین‌کاری مافوق ‌صوت دوار با ابزار الماسه هسته­دار، با توجه به پارامترهای ماشین‌کاری پرداخته شده است. با توجه به آزمایشات انجام‌شده مشاهده شد افزایش سرعت برشی و کاهش سرعت پیش‌روی موجب کاهش آسیب لایه­لایه­شدگی شده و کیفیت سوراخ را بهبود می­بخشد. همچنین با توجه به نتایج به‌دست­آمده، در نرم افزار مینی­تب، یک رابطه آماری بین پارامترهای ماشین‌کاری و لایه‌لایه‌شدگی ارائه شد. با توجه به مدل به‌دست­آمده، سرعت برشی تاثیر بیشتری بر میزان لایه­لایه­شدگی دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Study of the effect of machining parameters on delamination in rotary ultrasonic machining process of glass fiber reinforced polymer composite by diamond core tool

نویسندگان [English]

  • Mohammad Baraheni 1
  • Saeed Amini 2

1 Department of Manufacturing, Faculty of Mechanic, University of Kashan, Kashan, Iran

2 Department of Manufacturing, Faculty of Mechanic, University of Kashan, Kashan, Iran

چکیده [English]

Glass fiber reinforced composites pose numerous industrial applications that are because of suitable mechanical and physical properties. Drilling is a common method to connect fiber reinforced material structures. Rotary ultrasonic machining is one of the new methods in machining of fiber reinforced composites that is highly attractive in recent years. Fiber reinforced composite laminates in machining operations, especially in drilling operations which are subjected to stress concentration, tend to be delaminated. Delamination damage is strongly influenced by factors such as tool material and geometry and also machining parameters. Therefor in recent years, new tools such as diamond core drills are used in drilling of fiber reinforced composites due to their lower force creation and simultaneous drilling operation and hole internal grinding. In this research, delamination of glass fiber reinforced composites (GFRP) with a percentage of 65% fiber in rotary ultrasonic machining process using diamond core drill regarding machining parameters have been discussed. According to conducted experiments, it was observed that cutting speed increment and feed rate reduction, decreases the delamination damage and improves hole quality. Also based on achieved results, a statistical relationship between machining parameters and delamination in Minitab software offered. According to the resulting model, cutting speed has a greater impact on the amount of delamination

کلیدواژه‌ها [English]

  • Glass fiber reinforced composite
  • Diamond core tool
  • Delamination
  • Rotary ultrasonic machining

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