Stepped shear bolts

冷镦加工是一种少切削或无切削的压力加工新工艺
金屬。它是一種利用金屬在下列因素作用下產生塑性變形的加工方法
外力作用下，在模具的幫助下，重新分配和轉移金屬的體積，以形成
所需的零件或坯料。冷镦工艺最适合生产标准的
螺栓、螺絲、螺帽、鉚釘和銷等緊固件

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

   • 通常由 high-strength steel (e.g., Grade 5, Grade 8, or alloy steel) to ensure consistent shear performance.

   • Heat-treated for precise shear strength.

3. 頭部類型

   • 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. 線路類型

   • 五月特色 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.

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

應用：

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

• 航太： Shear pins in flight control systems.

• 汽車： Suspension or drivetrain components.

• 工業機械： Overload protection in couplings or gearboxes.

優勢：

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

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

• 耐腐蝕性： 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.