High Speed And Precision Angular Contact Ball Bearings -70-72 Series

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Product Profile

High precision and high-speed angular contact ball bearings usually have a 15 degree contact angle, with the suffix C . Angular contact ball bearings have raceways on both the inner and outer rings, and the inner and outer rings can move relative along the bearing axis. This type of bearing is particularly suitable for bearing composite loads, i.e. loads acting both radially and axially. The axial load bearing capacity of angular contact ball bearings varies with the contact angle α Increase with the increase of. The contact angle is the angle between the contact point line between the ball and raceway in the radial plane and the vertical line of the bearing axis.

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Company Profile

NBB Bearing Technology Co., Ltd. was established in 2017,NBB is basic on the concept of “Technology Serving Society”, focusing on the improvement and promotion of bearing technology and quality. The company is committed to developing and producing high-precision and high-performance bearings to meet the needs of different industries. Our products adopt advanced design technology and management processing technology to ensure their superior performance and reliable use.

Characteristics

The rolling element of high-precision high-speed single row angular contact ball bearings is ceramic balls. The accuracy levels of this bearing are P5, P4, and P2. Filling high dN value grease to meet the technical requirement of 3 times the limit speed.

Application

Mainly used in fields such as machine tool spindles, high-frequency motors, gas turbines, centrifuges, and motor equipment.

Installation precautions

The service life of high-speed and high-precision angular contact ball bearings is closely related to their installation, and the following precautions should be taken into account:
1. The installation of bearings should be carried out in a dust-free and clean room. The bearings should be carefully selected and matched, and the spacer rings for bearings should be ground. On the premise of maintaining the same height as the inner and outer rings, the parallelism of the spacer rings should be controlled below 1um;
2. Before installing the bearing, it should be cleaned thoroughly. When cleaning, the inner ring slope should be facing upwards, with flexible hand sensing and no stagnation. After drying, a specified amount of grease should be added. If it is oil mist lubrication, a small amount of oil mist oil should be added;
3. Special tools should be used for bearing installation, with uniform force and no knocking is allowed;
4. Bearings should be stored in a clean and ventilated manner, free from corrosive gases, with a relative humidity not exceeding 65%. Long term storage should be regularly protected against rust.

Installation Precautions for High-Speed Machine Tool Angular Contact Ball Bearings

The installation of high-speed machine tool angular contact ball bearings is a highly precise and cleanliness-demanding task. The following are key precautions for high-speed application scenarios:

Environment and Preparation: Creating a Surgery Room Level Environment
● Cleanroom operation: Must be performed in a dust-free, clean room; ideally a Class 1000 cleanroom.
● Precision matching: Bearings need careful matching, especially internal and external spacers, with parallelism controlled below 1 micrometer.
● Cleaning and lubrication: Clean thoroughly before installation; during cleaning, keep the inner ring slope facing upward. After air-drying, immediately add the specified amount of grease or oil mist. Grease fill quantity is typically 20%-30% of the bearing internal space; excessive amount will cause churning heat at high speeds.

Installation Process: Precise Force Application, Strictly Prohibit Violence
● Specialized tools: Must use specialized tools (such as sleeves, hydraulic presses) for uniform force application; striking is strictly prohibited.
● Hot mounting: For interference fits, an induction heater is recommended for uniform heating. Heating temperature is typically controlled at 80-100C, and must not exceed 125C or use open flames.
● Correct direction: Confirm the bearing force direction (typically the outer ring has “V” or notch markings); choose back-to-back (DB) or face-to-face (DF) configuration based on spindle design. Installing backwards will cause axial movement and temperature rise runaway.
● Fixing and locking: It is recommended to use locking nuts with axial anti-loosening bolts; the axial runout of the mounting face should be less than 2 micrometer.

Preload and Lubrication: Keys to High-Speed Performance
● Preload: High-speed spindles typically use Light Preload. Excessive preload will cause excessive temperature rise or even burn out the bearing at high speeds.
● Lubrication method: Oil mist lubrication or oil-air lubrication is preferred for high-speed conditions; if grease lubrication is used, the fill quantity must be strictly controlled (20%-30%).

Post-Installation Inspection and Running-In: Verification and Running-in
● Static inspection: Manual rotation should be smooth without sticking; radial runout target is less than or equal to 0.005mm, and axial movement target is less than or equal to 0.01mm.
● Dynamic running-in: Newly installed bearings must undergo stepped trial operation. Run at 500-1000 rpm no-load for 10-15 minutes first; if no abnormality, gradually increase to 50% and 80% of rated speed, running for 20-30 minutes each.
● Temperature rise monitoring: The temperature rise should not exceed 40C. If temperature rises sharply or abnormal noise occurs, stop the machine immediately.

Success depends on fine control of four dimensions: cleanliness, installation precision, preload, and lubrication.

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