Ùروش پیچ Ùˆ مهره
اندازه پیچ یک عنصر بسیار مهم در طراØÛŒ ماشین آلات Ùˆ سازه های Ùلزی به طور Ú©Ù„ÛŒ است، با این مقاله ما بسیاری از جنبه های مربوط به Ùیزیک اتصالات پیچ Ùˆ مهره را روشن خواهیم کرد.طبقه بندی پیچ Ùˆ مهره هاهر پیچ از طریق یک سری داده های ساختمانی طبقه بندی Ù…ÛŒ شود Ú©Ù‡ مهمترین آنها عبارتند از:- تعری٠نوع نخ (M مطابق با متریک است).- قطر قسمت رزوه شده (در مثال 30 میلی متر)Ø›- طول قطعه ای Ú©Ù‡ در معرض پیش بارگذاری Ùˆ در نتیجه اÙزایش طول قرار Ù…ÛŒ گیرد.- درجه مواد یا کلاس قدرت؛پیچ‌ها را می‌توان با Ùولاد بدون آلیاژ (گالوانیزه شده Ùˆ داغ) یا آلیاژی با Ù…Øتوای کربن Ú©Ù… یا متوسط ​​ساخت، اما برای آن‌هایی Ú©Ù‡ استØکام بالایی دارند، این ماده در معرض عملیات سخت‌شدگی Ùˆ تلطی٠قرار می‌گیرد.کلاس مقاومت پیچ Ùˆ مهرهکلاس استØکام نشان‌دهنده مقاومت شکستگی Ùˆ استØکام تسلیم پیچ‌ها است، با دو عدد Ú©Ù‡ با یک نقطه از هم جدا شده‌اند نشان داده می‌شود Ùˆ رایج‌ترین کلاس‌های مقاومتی Ú©Ù‡ در کاربردهای صنعتی با آن مواجه می‌شوند عبارتند از 4.6ØŒ 5.6ØŒ 6.8ØŒ 8.8ØŒ 10.9 Ùˆ 12.9.با تجزیه Ùˆ تØلیل دقیق این مقادیر، Ù…ÛŒ توان به عنوان مثال یک پیچ کلاس 8.8 موارد زیر را تعری٠کرد:RmØŒ Ú©Ù‡ مقدار اول است، نشان دهنده بار شکست است، در Øالی Ú©Ù‡ مقدار دوم نشان دهنده درصد نسبت به Rm است Ú©Ù‡ در آن قدرت تسلیم یاÙت Ù…ÛŒ شود. هر دو مقدار بر Øسب N/mm 2 بیان Ù…ÛŒ شوند Ùˆ اگر در مساØت هسته ضرب شود (در میلی متر 2 ) مقادیر بیان شده در kN را خواهیم داشت Ú©Ù‡ یک واØد اندازه گیری بسیار آشناتر است.بیایید یک مثال را ببینیم:- پیچ M30 10.9- مساØت هسته: 557mm2- عملکرد: 900N / mm2 x 557mm2 = 501KN- شکست: 1000 نیوتن / میلی‌متر مربع × 557 میلی‌متر مربع = 557 هزار نیوتنپیش بار نامی معمولاً در جداول در 70Ùª -75Ùª از قدرت تسلیم Ù…Øاسبه Ù…ÛŒ شود، اما ممکن است برای موارد خاص از درصد متÙاوتی استÙاده شود.copyright charset="utf-8" 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