The factors of slim ball bearing

A large number of domestic and international tests show: cage, collar, processing quality ball bearing vibration having different degrees of impact, which processing quality ball bearing vibration impact on the most obvious, followed by rings of processing quality, the most important influence factor is the roundness of the ball and rings, waviness, roughness, surface bump injuries.
Our ball products most prominent problem is the discrete vibration, surface defects serious (single point, the group points, pits, etc.), although the surface roughness, size, shape, and the error is not lower than the level of the loop, but the co-sets After high slim ball bearing vibration, and even different sound, the main problem is the waviness no control (no standard, no proper testing of the instruments), while the description of the machine vibration resistance poor, wheel, grinding disc, coolant, process parameters are problematic ; on the other hand to improve the management level, to avoid the bump injuries, scratches, burns and other machines of quality problems at any time.
For rings, the most serious impact of bearing vibration is channel waviness and surface roughness. For example, small and medium deep groove ball bearings inside and outside the channel roundness greater than 2μm, will have a significant impact on the bearing vibration, while the inner and outer channel waviness greater than 0.7μm, slewing ring bearing vibration value increases with increased waviness, the channel serious gouges Vibration can rise more than 4dB, and even different tone.
Whether balls or rings, waviness produced in grinding, superfinishing although you can improve waviness and roughness reduced, but the most fundamental measure is to reduce the process of ultra-fine grinding waviness, avoid randomness bump hurt, there are two main measures:
First, reduce the vibration of the rolling surface of ultra-fine grinding time, get a good shape accuracy and surface finish quality surface texture to reduce vibration, wear super machine must have good vibration resistance, bed and other important structural member having vibration absorption, super precision machine tools Whetstone oscillation system with good anti-vibration performance; improve grinding speed, grinding 6202 foreign commonly used outer raceway 60,000 spindle, grinding speed 60m / s or more, domestic general much lower, mainly due to the spindle and restrictions main bearing performance.
When the high-speed grinding, grinding force is small, thin grinding deterioration, do not burn easily, but also can improve the precision and efficiency, a significant impact on low-noise ball bearings; spindle speed characteristics of static and dynamic stiffness and low noise ball bearing large grinding vibration, the higher the stiffness, grinding speed, the less sensitive to changes in the grinding force, grinding system vibration is smaller; increase support rigidity spindle bearings, using random balancing technology to improve
the grinding spindle vibration sex. Foreign grinding vibration velocity approximately one tenth the domestic general spindle; Whetstone wheel is essential to improve the quality of cutting and trimming. China is currently the main problem is wheel Whetstone uniformity poor organizational structure, seriously affecting the ultra low noise ball bearing grinding process quality; sufficiently cooled, improve filtering accuracy; improve the resolution of the fine feed to the system, reduce the feed inertia; super reasonable processing mill process parameters and manufacturing processes are factors that can not be ignored, grinding allowance should be small, geometric tolerances and strict,
small ball ferris wheel bearing diameter should not use super-lapping, super coarse grinding should be separated to ensure good surface quality.
The second is to improve the machining accuracy of the reference plane, reduce grinding and superfinishing process of error reflection end surface is the outer diameter of the grinding process of super-positioning reference. The outside diameter of the channel ultra fine error reflection on the ditch by the outside diameter grinding, grinding on ditch super error reflection passed indirectly. If the work piece bump hurt in the transfer process, the complex will be directly mapped onto the raceway machined surface, the impact of bearing vibration. So you must take the following measures: to improve the positioning reference surface shape accuracy; processing pass smooth, no bump injury; rough allowance geometric error can not be too large, especially when allowance is small, too large error
will result in a final grinding and ultra-fine At the end of the final shape accuracy has not been improved to the quality requirements, seriously affect the consistency of the processing quality.
From the above analysis is not difficult to see: Auto-line consists of high performance, high stability of the machine system consisting of grinding the most suitable machining ultra low noise ball bearing, avoid bump hurt, reduce transmission error, eliminate artificial factors, improve processing efficiency and quality consistency reduce production costs and improve efficiency.