How to choose CNC lathe spindle bearings according to the characteristics of CNC lathes? -

The sorting structure of the spindle bearings of CNC lathes is different in their bearing capacity, rotation speed, and rotation precision. The spindles of CNC lathes mainly have two structures: heavy-duty and super-heavy. Therefore, CNC lathes with tailstock action must be used. Most CNC lathe equipment basically includes ultra-high-speed rotary cylinders and hydraulic chucks. They are respectively located at the front and rear of the main shaft. The centrifugal force generated during the specific operation is very large, and the transmission of torque is based on the pulley at the end of the shaft. Therefore, the radial stiffness necessary for the spindle of the CNC lathe, whether it is the front or the tail, is much larger than the axial stiffness. Generally, if the bearing with a contact angle of 15-30° is used in the two positions here, it is difficult to be applied. The required radial stiffness often results in shortened bearing life and insufficient rigidity for hard cutting. Cylindrical roller bearings are generally used in CNC lathe spindles, because this type of bearing can bear radial loads better than any other type of bearing, and has high speed characteristics. The gap can also be adjusted between 2 and 6 μm, which can well ensure the rotation accuracy and reasonable speed ratio of the spindle. The heavy-duty structure uses a pair of angular contact ball bearings with a contact angle of 25°, which can achieve axial rigidity under normal fast and heavy cutting conditions. With the development trend of high-rigidity CNC lathes and the popularization of hydraulic tailstocks, when CNC lathes with hydraulic tailstocks are used for long-term production and processing of tailstocks, there will be a constant axial force of more than 20KN applied to the angular contact For ball bearings, this data is equivalent to more than 20 times the high-speed heavy cutting force. The oil film of angular contact bearings is difficult to form under high pressure, which will accelerate the wear and loss of angular contact bearings. In order to better balance the belt tail In order to ensure the service life of the bearings of the CNC lathe spindle in the application process, we have designed a super-heavy-duty spindle equipped with 3 paired angular contact ball bearings to meet the long-term use of hydraulic tailstock CNC lathes. Because the speed, rotation accuracy and radial load of the CNC lathe spindle are determined by the clearance size and limit speed of the tapered hole double row cylindrical roller bearing, the speed of the heavy-duty and super-heavy-duty spindles is the same. The speed level will not be reduced due to one more CNC lathe spindle bearing. The difference between the two is the difference in the axial stiffness they carry. Reprinted from Co., Ltd., please specify the URL for reprinting: Only when the torque is accurate can the rotation be stable!

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