فروش پیچ و مهره

Category: Blog
اندازه پیچ یک عنصر بسیار مهم در طراحی ماشین آلات و سازه های فلزی به طور کلی است، با این مقاله ما بسیاری از جنبه های مربوط به فیزیک اتصالات پیچ و مهره را روشن خواهیم کرد.
طبقه بندی پیچ و مهره ها
هر پیچ از طریق یک سری داده های ساختمانی طبقه بندی می شود که مهمترین آنها عبارتند از:

- تعریف نوع نخ (M مطابق با متریک است).

- قطر قسمت رزوه شده (در مثال 30 میلی متر)؛

- طول قطعه ای که در معرض پیش بارگذاری و در نتیجه افزایش طول قرار می گیرد.

- درجه مواد یا کلاس قدرت؛
پیچ‌ها را می‌توان با فولاد بدون آلیاژ (گالوانیزه شده و داغ) یا آلیاژی با محتوای کربن کم یا متوسط ​​ساخت، اما برای آن‌هایی که استحکام بالایی دارند، این ماده در معرض عملیات سخت‌شدگی و تلطیف قرار می‌گیرد.
کلاس مقاومت پیچ و مهره
کلاس استحکام نشان‌دهنده مقاومت شکستگی و استحکام تسلیم پیچ‌ها است، با دو عدد که با یک نقطه از هم جدا شده‌اند نشان داده می‌شود و رایج‌ترین کلاس‌های مقاومتی که در کاربردهای صنعتی با آن مواجه می‌شوند عبارتند از 4.6، 5.6، 6.8، 8.8، 10.9 و 12.9.
با تجزیه و تحلیل دقیق این مقادیر، می توان به عنوان مثال یک پیچ کلاس 8.8 موارد زیر را تعریف کرد:
Rm، که مقدار اول است، نشان دهنده بار شکست است، در حالی که مقدار دوم نشان دهنده درصد نسبت به Rm است که در آن قدرت تسلیم یافت می شود. هر دو مقدار بر حسب N/mm 2 بیان می شوند و اگر در مساحت هسته ضرب شود (در میلی متر 2 ) مقادیر بیان شده در kN را خواهیم داشت که یک واحد اندازه گیری بسیار آشناتر است.

بیایید یک مثال را ببینیم:

- پیچ M30 10.9

- مساحت هسته: 557mm2

- عملکرد: 900N / mm2 x 557mm2 = 501KN

- شکست: 1000 نیوتن / میلی‌متر مربع × 557 میلی‌متر مربع = 557 هزار نیوتن

پیش بار نامی معمولاً در جداول در 70٪ -75٪ از قدرت تسلیم محاسبه می شود، اما ممکن است برای موارد خاص از درصد متفاوتی استفاده شود.

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