POM (Polyoxymethylene) Roller Bearings: Detailed Introduction

Overview:POM (Polyoxymethylene), also known by the trade names Delrin, Celcon, and others, is a high-performance engineering thermoplastic that is commonly used in the manufacturing of bearings due to its excellent mechanical properties and self-lubricating characteristics. POM roller bearings are specifically designed for applications where low friction, high wear resistance, and good dimensional stability are required.

Properties of POM:

• High Strength and Stiffness: POM is known for its high tensile strength and stiffness, making it suitable for bearing applications that require structural integrity.

• Self-Lubricating: POM has a low coefficient of friction and can operate effectively without additional lubricants, reducing maintenance and operational costs.

• Wear Resistance: It exhibits good wear resistance, which increases the lifespan of the bearings.

• Dimensional Stability: POM maintains its shape and size under varying temperatures and loads, ensuring consistent performance.

• Chemical Resistance: POM is resistant to many chemicals, making it suitable for use in environments with exposure to solvents, fuels, and other chemicals.

• Temperature Range: POM operates well within a temperature range of approximately -40°C to +100°C, although this can vary depending on the specific formulation and application.

Components of POM Roller Bearings:

• Inner Race: Typically made of POM, the inner race rotates with the shaft.

• Outer Race: The outer race is usually stationary and supports the rolling elements.

• Rolling Elements: These are the cylindrical or conical rollers that reduce friction between the inner and outer races.

• Cage: The cage holds the rolling elements in place and ensures even spacing.

• Seals/Shields: These components protect the bearing from dust, dirt, and other contaminants.

Advantages:

• Reduced Maintenance: The self-lubricating nature of POM reduces the need for regular lubrication.

• Lightweight: POM is lighter than metal, which can contribute to reduced overall system weight.

• Cost-Effective: POM bearings can be cost-effective compared to metal bearings, especially when considering the reduced need for maintenance and lubrication.

• Smooth Operation: The low friction characteristics of POM result in smoother operation and quieter running.

• Corrosion Resistance: POM is resistant to corrosion, making it suitable for use in wet and corrosive environments.

Disadvantages:

• Limited Temperature Range: POM bearings are not suitable for extremely high-temperature applications.

• Brittleness at Low Temperatures: At very low temperatures, POM can become brittle and may crack or break.

• Not Suitable for High-Speed Applications: POM bearings may not be ideal for applications requiring very high speeds due to limitations in their mechanical properties.

Applications:

• Light Industrial Machinery: POM roller bearings are commonly used in light-duty industrial machinery where low maintenance and quiet operation are important.

• Food Processing Equipment: Due to their corrosion resistance and ease of cleaning, POM bearings are suitable for use in food processing equipment.

• Medical Devices: POM bearings are used in medical devices where sterilization and biocompatibility are important.

• Automotive Components: They are used in various automotive components where low friction and wear resistance are beneficial.

• Office Equipment: POM bearings are found in office equipment such as printers and copiers.

• Consumer Goods: They are used in consumer goods like fans, air purifiers, and other household appliances.

Installation and Maintenance:

• Installation: POM roller bearings should be installed according to the manufacturer’s instructions to ensure proper alignment and function.

• Lubrication: Regular lubrication may not be necessary due to the self-lubricating properties of POM.

• Cleaning: Keeping the bearings and their surrounding areas clean is important to prevent contamination.

Conclusion:POM roller bearings offer several advantages over traditional metal bearings, including reduced maintenance, lightweight construction, and smooth operation. They are particularly useful in applications where low friction, high wear resistance, and good dimensional stability are required. The selection of POM roller bearings should consider the specific application requirements, such as temperature range, load capacity, and operating conditions.