Product Features of Self-Lubricated Bronze Bushing Bearings

1. No Oil Supply System Needed

These bearings eliminate the need for oil supply devices, oil holes, and grooves. This simplification reduces the costs associated with the fuel supply system, including processing and assembly, ultimately lowering manufacturing expenses.

2. Reduced Operating Costs

The use of self-lubricating bearings substantially cuts down on the need for lubricating oil and equipment maintenance, while also eliminating the risks associated with oil shortages.

3. Streamlined Design Process

The absence of oil simplifies the design and structure, reducing costs and saving design time. Additionally, using self-lubricating bearings can enhance mechanical properties, extend service life, and improve reliability.

4. Environmental Benefits

With no need for waste oil recycling, these bearings are environmentally friendly, promoting cleaner production practices.

5. Versatile Mechanical Applications

As essential parts of the mechanical industry, these bearings are crucial for normal machine operation. They are designed to withstand high loads and adverse conditions such as foreign body intrusion, extreme temperatures, and imperfect maintenance, which would typically cause galling in general sliding bearings.

Usage Notes

1. Where possible, design using standard specifications.
2. Ensure there are no foreign bodies in the assembly.
3. After use, a solid lubricant may form a black or gray-black film on the sliding surface. Do not scrub this off; it is usual.
4. Applying lubricating oil to the grinding parts before assembly can shorten the running-in period, facilitating smoother machinery operation.
5. When assembling, press in slowly; avoid hammering to prevent bearing damage and deformation.
6. Select appropriate materials for different parts to improve mechanical performance and extend the bearing’s service life.
7. For high-load, reciprocating movements, consider using screw fixation.
8. In environments like fresh water, seawater, or maritime settings, use stainless steel or surface plating.

GB-CuZn25Al5, also known under the DIN 17656-1983 standard, is a high-strength copper-zinc alloy with notable characteristics and applications. Here is a detailed overview:

Chemical Composition

The alloy typically consists of:

• Copper (Cu): 70-75%
• Zinc (Zn): 20-25%
• Aluminum (Al): 4-6%
• Iron (Fe): 2-3%
• Manganese (Mn): 2-4%

This composition provides the alloy with its distinct properties, including high strength and good wear resistance.

Properties

Mechanical Properties

• Tensile Strength: Approximately 655 MPa
• Yield Strength: Around 379 MPa
• Elongation: Typically around 15-25%
• Hardness: Varies depending on the specific processing but generally high

Physical Properties

• Density: Approximately 7.7 g/cm³
• Thermal Conductivity: Moderate, suitable for applications requiring thermal management
• Electrical Conductivity: Lower than pure copper due to the alloying elements

Other Characteristics

• Corrosion Resistance: Good, but can be susceptible to dezincification in certain environments
• Machinability: Fair, with a machinability rating of around 25% compared to free-cutting brass

Applications

GB-CuZn25Al5 is used in various demanding applications due to its high strength and wear resistance:

• Heavy-duty bearings and bushings: Suitable for slow-speed applications with good lubrication
• Hydraulic cylinder components: Beneficial for their durability and strength
• Marine hardware: Utilized for its corrosion resistance and strength
• Gears and worm wheels: Preferred for their wear resistance and mechanical properties

Casting Methods

This alloy can be processed using several casting methods, including:

• Sand Casting: Suitable for large and complex shapes
• Centrifugal Casting: Produces dense and reliable components, especially for cylindrical shapes
• Continuous Casting: Ensures high-quality bars with consistent mechanical properties

Standards and Equivalents

GB-CuZn25Al5 conforms to the DIN 17656-1983 standard and has several international equivalents:

• CuZn25Al5Mn4Fe3-B (European equivalent)
• C86300 (ASTM standard)
• HTB3 (British standard)

Conclusion

GB-CuZn25Al5 is a versatile and high-performance copper-zinc alloy suitable for various industrial applications requiring high strength, good wear resistance, and moderate corrosion resistance. Its specific composition and properties make it an excellent choice for heavy-duty and marine applications.