The machine spindle is the heart of the whole machine, workpiece machining accuracy, the key parts of a direct impact on machine performance. Today's high-speed, efficient production methods on the spindle speed, accuracy, load capacity and running noise put forward higher requirements, spindle maker to face a huge challenge, and correct bearing selection can help spindle manufacturers deal with these challenges. Different types of bearing all three have their application environment, it is difficult to work out a common selection rules.
Choice for precision bearings, you need to consider the following factors: accuracy, rigidity, speed and load. According to specific application requirements to determine which factor is more important, and then targeted selection. The following will introduce the different types of Timken super precision angular contact ball bearings as well as the application environment to which they apply.
Overall, the Timken precision angular contact ball bearings are universal in the form of the pairing group any interchangeable with other brands of the same type and size of the bearing. Timken to the amount of deviation of each column bearing axial preload control in a smaller range of further control the use of multi-row bearings with group The inner microns code in each column, to get more consistent tight with , so after installation of the contact angle can be approximately equal, and ultimately more accurate preload and rigidity.
A standard series of spindle bearings
This series is divided into P4 and the P4S level, inside and outside the ring and rolling element commonly used 52 100 full-hardenability steel. Under certain conditions, the speed of greased 650,000 DN, oil lubrication can be achieved 1,000,000 of the DN. Compared with high-speed series, the rolling element of the standard series of larger diameter, higher preload, apply to the cutting load is large and the system dynamic stiffness requirements of the occasion.
In addition, add grease need to be considered in the selection. Add too much grease, will seriously affect the bearing heat, the operating temperature will rise sharply, causing the grease life is rapidly declining, but also shorten the bearing life; grease add too little, can not form a lubricant film to separate the shaft ring and rolling The friction between the body of each other will result in higher temperature rise, the same effect on bearing life. Different speed, the recommended fat content accordingly. When the speed is lower than 500,000 the DN, the amount of fat should be 25% of the bearing's internal free space - 40%; when the speed is higher than 500,000 DN, plus the amount of fat should be 15% of the bearing's internal free space - 20%. Should be noted that the standard series of the cage there are two types: bakelite of rolling element guide nylon cage and outer ring guided cage. The two types of bearing's internal free space calculation plus the amount of fat should be distinguished.
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