Stepped shear bolts

冷間圧造加工は、切削の少ない、あるいは切削を必要としない新しい圧造加工のひとつである。
金属。の作用による金属の塑性変形を利用した加工法である。
外力を受け、金型の助けを借りて、金属の体積を再分配し、移動させる。
必要な部品やブランクを製造します。冷間圧造工程は、標準的な
ボルト、ネジ、ナット、リベット、ピンなどの留め具。

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

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

   • Heat-treated for precise shear strength.

3. ヘッドの種類

   • 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. スレッドタイプ

   • 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.

アプリケーション

• 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.

利点がある：

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

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

• 耐食性： 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.