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Application of Yuwei precision bearing in high speed motor spindle

Release time: December 17, 2017 21:45:09 Views: 974

The spindle bearing is an important element to determine the working performance of the spindle unit. The stiffness, bearing capacity, high-speed performance, temperature rise performance, vibration and noise of the spindle system are all related to the precision bearing.

Selection and configuration of precision spindle

The selection of bearing types should be based on the main shaft technical indicators, and considering its economy and technical complexity, so as to select the appropriate bearing types among fluid bearing and rolling bearing.

Bearing selection and configuration are based on the mechanical characteristics of the spindle system and the requirements of the spindle technical indicators. Bearing selection and configuration is actually based on the technical indicators, in the stiffness requirements, speed requirements, load size, spindle structure design of space requirements to balance the bearing selection and configuration.

High speed machine tool spindle bearings generally have angular contact bearings, cylindrical roller bearings and two-way angular contact bearings. For the high-speed light load high-speed spindle, the front and rear supports are generally angular contact bearings.

The contact angles of angular contact bearings for high-speed spindle are mainly 15 ° and 25 ° respectively. The bearing with 15 ° contact angle has better high-speed performance, but lower axial bearing capacity and stiffness. Usually, the angular contact ball bearing with 15 ° contact angle is mostly used for grinding machine, milling machine and spindle of high-speed machining center.

Compared with the steel bearing of the same specification and accuracy, the ceramic rolling bearing can increase the speed by 20%, reduce the temperature rise by 35% - 60%, and increase the service life by 3-6 times. The ceramic bearing has high rigidity, is insensitive to the temperature difference between the inner and outer rings, and has a small change in preload during operation. Therefore, high-speed ceramic ball bearings are widely used in modern machine tools.

Support structure design of 2 high speed spindle unit

The bearing limit mode and its limiting element directly affect the overall accuracy index of the spindle unit, and the axial limiting element is also one of the important components to ensure the bearing preload.

In the design of spindle unit of modern CNC machine tools, precision lock nut and step interference sleeve are commonly used as axial limiting elements of bearing.

It is relatively simple to install with precision nut, but it requires high machining accuracy for the thread part of the spindle. Because the thread connection itself is a dynamic unbalance factor, it will affect the dynamic balance performance of the spindle. Therefore, this kind of structure is usually used for mechanical spindles below 8 000 R / min.

For the spindle with higher speed, the dynamic balance precision is very high.

In order to ensure the accuracy of dynamic balance, step interference sleeve is usually used as axial limiting element of bearing. In this way, it is easy to ensure that the positioning end face of the interference sleeve is perpendicular to the axis line, and the spindle dynamic balance is good. However, the installation and disassembly in this way needs to design the corresponding special process equipment according to the form of the main shaft, and its installation and disassembly is complex and requires high requirements.

If necessary, motor bearing, spindle bearing technical problems or Motor bearing Spindle bearing For technical requirements, please call Shanghai Yuwei Bearing Co., Ltd. service hotline: 021-51099639 or 15001823721 or email: YW @ gifudayo.com official website: http://gifudayo.com

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Shanghai Yuwei Bearing Co., Ltd. (Headquarters)
Tel: 021-51099639
Fax: 021-51861291
Email address: yw@gifudayo.com
Address: 2758 Songjin Road, Zhangyan Town, Jinshan District, Shanghai, China
Shaanxi Yuwei Bearing Manufacturing Co., Ltd
Tel: 029-86696506
Fax: 029-89503160
Email address: sales@gifudayo.com
Address: Qinhan new town free trade zone, Xixian new area, Shaanxi Province
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