Chains
(15)
Oil Seals
(3)
Sprockets
(9)
Springs
(7)
Stamped Parts
(7)
Bolts, U-bolt
(2)
At present, China deep groove ball bearings and seal products advanced internal structure parameters are almost the same, but such products in China the level of vibration and noise are very different and foreign products, mainly in the manufacturing and working conditions and factors. From the bearings industry point of view, condition factors can make reasonable demands on the host to solve, and how to reduce vibration caused by the manufacturer and the noise factor is the bearing industry must be addressed. Many domestic and international tests show that: the cage, ring, ball bearing vibration processing quality of different degrees, of which the processing quality of ball bearing vibration on the most significant, followed by the ring of processing quality, the main effect factor is the ball and ring roundness, waviness, surface roughness, surface Kepeng injury, etc.. Ball products in China’s most prominent problem is the value of discrete vibration large, severe surface defects (single point, cluster points, pits, etc.), even though the surface roughness, size, shape, error levels are not lower than the outsider, but the co-sets After the bearing vibration value is high, or even create different tones, the main problem is that waviness does not control (no standards, no suitable test and analysis equipment), an indication of poor machine vibration, grinding, grinding disc, the cooling fluid, process parameters have a problem ; on the other hand to improve the management level, to avoid the bump hurt, 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, the small and medium sized deep groove ball bearings inside and outside the channel is greater than 2m circle, the vibration of bearings will be obviously affected by internal and external channel ripple is greater than 0.7m, the bearing vibration value with the increase of waviness, a serious channel 4dB increase of vibration injury knock over, or even different tone. Both balls or rings, waviness resulting from grinding, Superfinishing Although it can improve the waviness and roughness decreased, but the most fundamental measure is to reduce the ultra-fine grinding process of waviness, to avoid random knock injury, there are two main measures: First reduce the rolling surface of the vibration when the ultra-precision grinding, get a good surface finish quality and shape accuracy and surface texture to reduce vibration, grinding machine to be super good vibration resistance, and other important structural parts bed with absorber, super precision machine tools whetstone oscillation system with good anti-vibration performance; second is to increase grinding speed, grinding abroad outside 6202 60 000 commonly used roller spindle, grinding speed of 60m / s or more, domestic general much lower, mainly due to performance of the main bearing spindle and restrictions. In the high-speed grinding, the grinding force is small, thin grinding deterioration is not easily burn, but also can improve the machining accuracy and efficiency, low noise ball bearing great influence; spindle static and dynamic characteristics of stiffness and speed of ball bearings for low noise great influence on grinding vibration, stiffness and the grinding speed on the grinding force of the change is not sensitive to vibration of the smaller grinding system; increased spindle bearing support stiffness, random balancing technology to increase the grinding spindle vibration sex. Foreign grinding vibration speed (such as Gamfior) is about one-tenth of the domestic general spindle.