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At home and abroad a large number of experiments show that: have different effects on processing quality of the cage, ring, ball bearing vibration, the processing quality of the
ball is the most significant impact on bearing vibr ation, followed by the processing quality of the rings, the most important influence The roundness of the ball and rings,
waviness, surface roughness, surface bump injury.
double row bearingSteel ball products in China is the most prominent problem is the vibration value of discrete, serious surface defects (single point, the group points, pits, etc.), despite the
surface roughness, size, shape, and error is not less than the outside of the circle level, but together After bearing vibration value, and even produce a different sound, the
main problem is no control of the waviness (no standards, no appropriate test and analysis equipment), while the machine tool vibration resistance, grinding wheel, grinding
disc, coolant, process parameters are problems ; the other hand, to improve the management level, to avoid the bump injuries, scratches, burns at any t ime machine quality
problems.
NTN bearigFor rings, the impact of bearing vibration of the most serious but also channel waviness and surface roughness. For example, the roundness of small and medium-sized deep groove
ball bearing inner and outer channel is larger than 2μm, will be bearing vibration significant impact inside and outside the channel waviness greater than 0.7μm, the bearing
vibration value increases with the waviness, severe channel knock hurt enable vibration increased by 4dB or more, or even a different sound.
Whether it is a ball or rings, waviness produced in the grinding, superfinishing can improve the waviness and reduce roughness, but the most fundamental measure is to reduce the
waviness in the grinding of ultra-fine process, to avoid the randomness bump injury, there are two main measures:
spindle bearingFirst, to reduce the rolling surface grinding ultra-precision vibration, to get the good shape of the surface machining accuracy and surface texture quality in order to reduce
vibration, grinding and superfinishing machine must have a good vibration resistance, bed structure with vibration absorbers, super precision machine tools Whetstone oscillating
system with good anti-vibration performance; improve grinding speed, the outer raceway commonly used foreign grinding 6202 60000 electric spindle, the grinding speed above 60m /
s, the domestic general much lower, mainly affected by the spindle and limit of the main bearing performance. In high speed grinding, the grinding force is small, grinding
deterioration thin, is not easy to burn, they can improve the precision and efficiency, low noise ball bearing a great impact; spindle static and dynamic stiffness and speed
characteristics of low-noise ball bearing grinding influence of vibration, the stiffness of the higher grinding speed is less sensitive to the change of grinding force, the
smaller the grinding system vibration; improve the spindle bearings supporting rigid, using the random balancing technology to improve the grinding spindle vibration sex.
Foreign grinding head vibration speed (eg Gamfior) is about one tenth of the domestic general spindle; to improve the cutting performance of the grinding wheel Whetstone and
finishing quality is essential. Wheel Whetstone organizational structure uniformity, seriously affecting the low-noise ball bearing grinding super processing quality; cooled
sufficiently to improve filtering accuracy; feed resolution of the fine to the system, reduce feed inertia; reasonable grinding and superfinishing processing process parameters
and machining processes can not be ignored , grinding allowance, shape and position tolerances and strict, small and medium-sized ball bearing outside diameter should not be
Superfinishing, super coarse grinding should not be separated, in order to ensure a good surface quality.
The second is to improve the accuracy of machining datum and reduce grinding and superfinishing processing error reflection outside diameter and the face is locating datum in
the process of grinding and superfinishing processing. Error reflection of outside diameter ultra-fine of the channel through the outer diameter of the groove grinding, groove
grinding groove ultra of error reflection passed indirectly. If the work piece bump hurt in the transfer process will be directly re-mapped to the machined surface of the
raceway to affect bearing vibration. It must take the following measures: to improve the positioning benchmark surface shape accuracy; processing pass smooth no bump hurt; rough
stay in the amount of form and position error can not be too large, in particular, leave the amount is small, too large error will cause the final grinding and ultra-fine shape
accuracy has not improved at the end of the final quality requirements, seriously affecting the processing quality and consistency.
Is not difficult to see from the above analysis: automatic line of high performance, high stability of the machine tool system grinding and superfinishing processing of low-
noise ball bearing is the most appropriate, bump injuries can be avoided, reduce the transmission error, eliminate artificial factors, improve processing efficiency and quality
consistency reduce production costs, improve enterprise efficiency.
