Oil impregnated iron bushings, based on iron base powder metallurgy (P/M), are a type of self-lubricating bearing designed for various applications. These bushings are manufactured using powder metallurgy technology, which involves the forming and sintering of metal powder—typically iron or bronze—into a porous structure that can be impregnated with lubricating oil

The manufacturing process of these bushings includes several key steps:

1. Powder Production: The first step involves producing metal powder, with iron being the primary material for iron-based bushings. The powder’s characteristics, such as purity, particle size, and shape, significantly affect the performance of the final product.
2. Forming: The metal powder is then compacted into the desired shape and dimensions under high pressure. This process is known as forming
3. Sintering: After forming, the compacted powder (green compact) is heated to a temperature below its melting point. This process bonds the particles together, creating a solid structure with interconnected porosity.
4. Oil Impregnation: The final step involves vacuum impregnation of the sintered part with lubricating oil. This process fills the pores of the material with oil, providing a reservoir for continuous lubrication during operation.

Properties and Applications

Oil-impregnated iron bushings offer several advantages:

• Self-Lubricating: The oil stored in the pores of the bushing provides continuous lubrication, reducing friction and wear between moving parts. This feature is particularly beneficial in applications where regular maintenance or lubrication is challenging.
• Durability: These bushings are durable and suitable for high-load applications. The iron base provides good strength and wear resistance.
• Corrosion Resistance: While primarily chosen for their mechanical properties, these bushings can also offer some level of corrosion resistance, depending on the specific alloy and oil used.
• Versatility: They can be used in a wide range of applications, including home appliances, small motors, machine tools, automotive accessories, and more. Their self-lubricating nature makes them ideal for use in inaccessible or inconvenient locations.

Maintenance and Storage

For optimal performance and longevity, certain maintenance and storage guidelines should be followed:

• Re-impregnation: Although designed for long-term lubrication, re-impregnation with oil may be necessary after every 500 to 1000 operating hours. This process involves heating the bearing in an oil bath to allow for oil absorption.
• Storage: To prevent deterioration of the impregnated lubricating oil, bearings should be stored in a cool, low-humidity environment, away from materials that could absorb the oil.

In summary, oil-impregnated iron bushings made through iron base powder metallurgy offer a self-lubricating, durable, and versatile bearing solution for a wide range of applications. Their manufacturing process ensures a product capable of reducing maintenance needs and improving the reliability and efficiency of machinery.