鍍安全線螺栓

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

Safety wire bolts, also known as lock-wire bolts or drilled head bolts, are specialized fasteners designed to be secured with safety wire (lock wire) to prevent loosening due to vibration or rotation. These bolts are commonly used in aerospace, automotive, motorsports, and other high-performance applications where reliability is critical.

Bolt Plating for Safety Wire Bolts:

Plating is applied to safety wire bolts to enhance corrosion resistance, reduce friction, improve appearance, and sometimes to meet specific conductivity or thermal requirements. Common plating options include:

1. Cadmium Plating (Cad)

• Properties: Excellent corrosion resistance, good lubricity, and sacrificial protection.

• 外觀： Yellowish-silver.

• Common Use: Aerospace and military applications (though being phased out due to environmental concerns).

• Limitations: Toxic, restricted under RoHS and REACH regulations.

2. Zinc Plating (Zn)

• Properties: Good corrosion resistance, cost-effective.

• Common Use: Automotive, industrial, and general-purpose applications.

• Limitations: Less durable than cadmium in harsh environments.

4. Chrome Plating (Cr)

• Properties: Extremely hard, excellent wear resistance, decorative.

• 外觀： Mirror-like shine.

• Common Use: High-performance engines, marine applications.

• Limitations: Can be brittle and prone to chipping.

• 鍍安全線螺栓

Selection Considerations:

• Environment: Marine or high-humidity applications may require cadmium or nickel.

• Regulations: Cadmium is restricted in many industries; alternatives like zinc-nickel are preferred.

• Temperature: Nickel and chrome handle high heat better than zinc.

• Aesthetics: Chrome and nickel provide a polished look, while black oxide or zinc offers a matte finish.

結論：

The choice of plating for safety wire bolts depends on the application’s mechanical, environmental, and regulatory requirements. Aerospace often uses cadmium or zinc-nickel, while automotive and industrial applications may opt for zinc or phosphate coatings. Always verify industry standards (e.g., ASTM, MIL-SPEC) when selecting plating for critical applications.