Parafusos de cisalhamento em latão

O processo de encabeçamento a frio é um dos novos processos para a maquinagem sob pressão com menos ou nenhum corte
metal. É um método de processamento que utiliza a deformação plástica do metal sob a ação de
forças externas e, com a ajuda de moldes, redistribui e transfere o volume de metal para formar
as peças ou os espaços em branco necessários. O processo de encabeçamento a frio é o mais adequado para a produção de
elementos de fixação, tais como cavilhas, parafusos, porcas, rebites, cavilhas, etc.

Latão shear bolts are specialized fasteners designed to break or “shear” at a predetermined torque or under specific stress conditions. They are commonly used in applications where over-tightening could damage components or where tamper resistance is needed. Here’s a detailed description:

Features of Brass Shear Bolts:

1. Material:

   • Made from brass (often leaded for machinability), offering corrosion resistance, electrical conductivity, and non-sparking properties.

   • Brass is softer than steel, making it ideal for shear applications.

2. Design:

   • Shear Groove: A pre-weakened section (neck) near the head that snaps when torque exceeds a set limit.

   • Hex or Torx Head: Allows tightening until the bolt shears, leaving a smooth, tamper-resistant break surface.

   • Tipo de rosca: Typically machine threads (e.g., metric or UNC/UNF) for secure fastening before shearing.

3. Function:

   • Torque-Limiting: Prevents overloading by breaking at a calibrated torque.

   • Tamper-Proof: Once the head shears off, the bolt cannot be easily removed without specialized tools.

4. Aplicações:

   • Electrical Equipment: Grounding connections, busbars (to prevent over-compression).

   • Security Fixtures: Tamper-resistant panels, access covers.

   • Aerospace & Automotive: Critical assemblies requiring precise torque.

   • Plumbing/Gas Systems: Soft metal prevents sparking in flammable environments.

5. Vantagens:

   • Prevents damage from excessive force.

   • Deters unauthorized access.

   • Corrosion-resistant in moist/outdoor environments.

6. Disadvantages:

   • Non-reusable after shearing.

   • Lower shear strength compared to steel bolts.

Common Specifications:

• Standards: DIN, ASTM, or industry-specific (e.g., MIL-SPEC).

• Grades: Varies by alloy (e.g., C360 brass for machinability).

• Shear Torque: Customizable based on groove design and material thickness.

Installation Notes:

• Use a torque wrench to ensure proper shearing.

• Post-shear, the remaining shank may require a screw extractor for removal.