مسامير القص المتدرجة

عملية الرأس على البارد هي واحدة من العمليات الجديدة للتشغيل الآلي بالضغط ذات القطع الأقل أو بدون قطع
المعدن. وهي طريقة معالجة تستخدم التشوه البلاستيكي للمعدن تحت تأثير
قوى خارجية، وبمساعدة القوالب، تقوم بإعادة توزيع ونقل حجم المعدن لتشكيل
الأجزاء أو الفراغات المطلوبة. عملية الخراطة على البارد هي الأكثر ملاءمة لإنتاج الأجزاء القياسية
أدوات التثبيت مثل البراغي والبراغي والصواميل والمسامير والمسامير والدبابيس وغيرها

Stepped shear bolts are specialized fasteners designed to provide controlled shear failure under specific load conditions, often used in structural or mechanical applications where safety and predictable failure points are critical. Here’s a detailed description:

Key Features of Stepped Shear Bolts:

1. Stepped Shaft Design

   • The bolt has a reduced-diameter section (shear groove) along its shank, creating a deliberate weak point.

   • This step ensures the bolt shears at a predetermined load, protecting other components from damage.

2. Material & Strength

   • عادةً ما تكون مصنوعة من high-strength steel (e.g., Grade 5, Grade 8, or alloy steel) to ensure consistent shear performance.

   • Heat-treated for precise shear strength.

3. أنواع الرؤوس

   • Available in various heads (hex, socket, round) depending on application needs.

   • Some designs include a breakaway head that snaps off after proper installation torque.

4. نوع الخيط

   • May feature full or partial threading, with the shear step located in the unthreaded portion to avoid thread distortion during shearing.

5. Shear Load Control

   • The stepped section is engineered to fail at a specific shear force, acting as a mechanical fuse.

   • Used in safety-critical systems (e.g., aircraft, machinery, structural joints) to prevent overload.

التطبيقات:

• Structural Engineering: Shear-critical connections in steel frameworks.

• Aerospace: Shear pins in flight control systems.

• Automotive: Suspension or drivetrain components.

• Industrial Machinery: Overload protection in couplings or gearboxes.

المزايا:

• Predictable Failure: Prevents catastrophic damage by shearing at a set load.

• Easy Replacement: Broken bolts can be quickly replaced post-failure.

• مقاومة التآكل: Often coated (e.g., zinc, cadmium) for durability.

Example Use Case:

In a wind turbine, stepped shear bolts may secure the blade hub. If excessive force occurs (e.g., storm winds), the bolts shear, protecting the rotor assembly from severe damage.