There are three major uses for rolling bearings: spindles, ball screws, and general drive shafts. Therefore, CNC machines, machining centers, and precision machines should be considered when choosing bearings. In this article, we will discuss how to select precision machine tool bearings, machining center spindle bearings, and CNC machine tool spindle bearings.
Precision machine tool spindles should be selected above P5 precision for CNC machines, machining centers, and other high-speed, high-precision machine tools.
In machining centers and other high-speed, high-precision machine tools, ultra-precision bearings of P4 and above are recommended. The spindle bearing, which is the basic component of CNC machine tools, directly influences the speed, rotational accuracy, stiffness, vibration reduction performance, noise, temperature rise, and thermal deformation of CNC machine tools, thereby affecting their surface quality and accuracy. Therefore, high-performance machine tools require top-performance bearings.
Rotational accuracy refers to radial runout, section runout, and axial runout of the spindle system.
Several factors influence the accuracy of the spindle system.
1. The radial runout of the bearing collar groove corresponds to the spindle of the spindle system. Therefore, these errors are reflected on the machining surface of the bearing collar groove.
2. An inconsistency in the diameter of the bearing rolling body, along with shape differences, can result in regular errors in the spindle.
3. The side pendulum of the groove can cause axial movement of the spindle. In precision grinding machines, particularly bearing grinding machines, axial motion is particularly noticeable. By using the method of groove grinding, the scrap rate and noise will be greatly increased.
Bearing rolls will be deformed according to the size and position error of the bearing mounting work surface. As a result, both the inner and outer rings of the bearing will tilt. This will result in inconsistent bearing stiffness in all directions and reduce the accuracy of rotation of the spindle system. Grinding is required on the end faces of the nut, spacer sleeve, and washer of the adjustment gap. In addition, the verticality of the shaft rotation axis should correspond to the accuracy of the installed bearing, otherwise, it will reduce the working accuracy of the bearing.
The Wuxi Sanli bearing company has been developing, producing, and testing bearings for 37 years. Specifically, it focuses on the development and production of machining center spindle bearings, CNC machine tool spindle bearings, and precision machine tool bearings. Outside diameter up to 450mm, bore size 10mm or more, precision has P0 P6 P5 P4 P2 enterprise standards are higher than the national standard, while precision angular contact bearings can be combined to meet the needs of the customer for grouping and professional customization.
