اکستروژن آلومینیوم

اکسترود فرایند تغییر شکل آلومینیوم است که در آن بلوک فلزی (بیلت) آلومینیوم در اثر اعمال فشار از قالبی با سطح مقطع کوچکتر عبور می کند. در واقع اکستروژن فرایند متراکم سازی غیر مستفیم است. نیروهای لازم برای این متراکم سازی به وسیله تماس بیلت با محفظه قالب و قالب ایجاد می شوند که مقادیر آنها بسیار زیاد است. تماس بیلت با محفظه قالب و قالب منجر به ایجاد تنش های فشاری بالایی شده که این تنش ها باعث کاهش احتمال بروز ترک سطحی بیلت حین انجام فرایند می شوند.

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اکستروژن آلومینیوم بهترین روش برای شکستن ساختار ریختگی بیلت آلومینیوم است چرا که در این فرایند بیلت تنها تحت تاثیر نیروهای فشاری قرار می گیرد. بسته به نوع آلیاژ و روش مورد نظر اکستروژن می تواند به صورت سرد و گرم انجام شود.
در اکستروژن گرم بیلت برای تسهیل در انجام تغییر شکل پلاستیک پیش گرم می شود.
در اکستروژن مستقیم که مرسوم ترین روش مورد استفاده در اکستروژن آلومینیوم است، بیلت داخل محفظه قالب قرار گرفته و با فشار رام به درون قالب هل داده می شود. روش اکستروژن مستقیم، در تولید میلگرد آلومینیومی، مفتول آلومینیومی، لوله آلومینیومی و مقاطع آلومینیوم تو پر و تو خالی مورد استفاده قرار می گیرد.

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21دیدگاه برای“اکستروژن آلومینیوم

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