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How to choose deep groove ball bearings suitable for specific industrial equipment?

Release time:

2025-06-20

When selecting deep groove ball bearings for specific industrial equipment, it is necessary to comprehensively consider factors such as equipment operating conditions, performance requirements, and environmental conditions. The following provides a systematic selection guide from the dimensions of technical parameters, operating condition analysis, and special requirements:

I. Clarify equipment operating condition parameters
1. Load type and magnitude
Radial load dominant: For common motor rotors and conveyor rollers, standard deep groove ball bearings (6000 series) are preferred due to their strong radial load-carrying capacity.
Axial load or combined load: If the equipment has axial force (such as the axial thrust of a water pump impeller), deep groove ball bearings with a retainer groove (such as 6200-N series) can be selected, or an axial positioning device can be used to prevent bearing misalignment.
Heavy load scenarios: For applications like metallurgical rolling mills and construction machinery, reinforced structures (such as thickened rings and large steel balls) should be selected, or self-aligning performance assistance can be adopted (but the self-aligning ability of deep groove ball bearings is limited, and other types of bearings can be considered in heavy load situations).
2. Speed requirements
High-speed operation (such as machine tool spindles, speed > 10,000 r/min):
Select low-friction designs (such as resin cages, high-precision tolerance grades P4/P5) to reduce heat generation;
Materials can be ceramic balls (Si3N4) or stainless steel (to reduce centrifugal force and thermal expansion), for example, 608 ceramic bearings are suitable for high-speed electric spindles.
Low-speed heavy load: For injection molding machine clamping mechanisms, focus on bearing rigidity and select large clearance (C3/C4) to avoid jamming.

II. Consider environmental and installation conditions
1. Working environment
High-temperature scenarios (>120°C):
Select high-temperature resistant bearing steel (such as SUJ2 quenched) or ceramic bearings, and change the lubricating grease to silicone-based or perfluoropolyether grease;
Example: Special models with a temperature resistance of over 300°C are required for kiln conveyor belt bearings.
Dust / Moisture / Corrosive environments:
Select bearings with seals (such as 2RS) or dust covers (ZZ), and the seal material should match the medium (NBR for oil contamination, FKM for acids and alkalis);
In the food industry, stainless steel materials (such as AISI 440C) are selected, which comply with FDA certification to avoid rust and contamination.
2. Installation space and precision
Compact space: For robot joints, select thin deep groove ball bearings (such as 6800 series) or flange bearings (with installation shoulders) to reduce radial dimensions.
High-precision positioning (such as support for the lead screw of a machining center):
Select tolerance grades P2/P4, and use interference fit installation (interference between the shaft and inner ring, clearance between the hole and outer ring) to ensure rotational accuracy ≤ 0.01mm;
Select C2 clearance (moderate clearance after tight fit to avoid heating).

III. Performance and life optimization
1. Lubrication and sealing design
Long-term lubrication: For maintenance-free equipment such as wind turbine gearboxes, select long-lasting lithium-based grease (life ≥ 50,000 hours), or self-lubricating cages (such as graphite inserts).
High-speed lubrication: Use oil mist lubrication or oil-air lubrication to avoid grease lubrication failure due to high-speed oil flinging.
2. Life calculation and redundancy design
Calculate the basic rated life (L10h) according to ISO 281 standard:
General equipment requires L10h ≥ 10,000 hours, and critical equipment (such as nuclear power plant pumps) needs ≥ 50,000 hours;
If the load fluctuates greatly, a dynamic load factor (such as multiplying the impact load by 1.5-3 times) should be introduced.

How to choose deep groove ball bearings suitable for specific industrial equipment?

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