How to improve the dynamic function of deep groove ball bearings

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How to improve the dynamic function of deep groove ball bearings

Source: China Bearing Network Time: 2018-03-14
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1. Mechanism of oscillation noise of deep groove ball bearings The mechanism of oscillation noise; there are two different ways of manipulating oscillation and noise in the national watch. There are two main reasons for bearing oscillation. First, the shaft is externally encouraged to cause the bearing inherent. Oscillation; refers to the inner ring of the bearing; the natural oscillation of the outer ring, the rolling body and the holding frame: the second is the forced oscillation caused by the touching and touching of the moving parts; including the ball because the rolling body is not ambiguous; The track is not a ambiguous circle (roundness, waviness), the lubrication surface (roughness) where the tumbling surface is not ambition, and the forced oscillation caused by the resistance of the roll body and the support frame during the movement and the impurities in the lubricant; the oscillation and the sound have Close contact; but in a sense a little different; that is, sound originates from oscillation; sound is the transmission of oscillation in the air to give people a feeling of hearing; thus the UHF oscillator is not heard. If the characteristics of the oscillating receiver and the audible receiver are the same; the two received signals are fully correlated; according to this concept; the oscillation or noise is controlled It has the same effect; it is easy to operate because of the oscillation of the operation; therefore, the control of the oscillations in the national watch ensures the quality of the product; thus; on the general bearing; it advocates the limited manpower and financial resources to control the bearing oscillation. Noise is independent of the quality specification; of course, it is based on foreign inspection; about unique products; such as computer hard disk drive system; bearing in video recorder CD drive system; it is not convenient to use oscillation check; can make noise measurement method specification to check.
2. The sealing function should be adopted. The main problem of sealing deep groove ball bearings in China is the leakage of grease and dustproof; in short, the sealing function is poor; the non-touch sealing has no big problem. The first is the problem of touch sealing. The reason is that the sealing layout of China is relatively backward. The key point of the sealing layout is on the sealing groove of the rotating part and the sealing lip of the sealing cover. There are three ways to seal the seal; one has no groove actually; the second one has a small inner diameter. There is a step on the path; the third one has a perfect sealing groove; the sealing lip has a single lip and a double lip; we think that the double lip seal and the groove seal and layout should be carried out; because this method is a touch seal and a labyrinth seal The connection; the sealing effect is better; but the process is messy; the cost is slightly higher.
3. The method of oscillating grading should be adopted for the method of falling oscillation; there are currently JB/T7047---93 "Deep groove ball bearing oscillation (acceleration) skill condition" and JP/T5009--94 "deep groove ball bearing oscillation (speed) skill Conditions. These two specifications have been revised several times; have played an outstanding role in the professional bearing vibration reduction operation; however; now users are not only the need to add Z4 group; VI group problems. More importantly; users proposed to prevent bearings The need for abnormal sounds or murmurs is reflected in the norm; abnormal sounds and murmurs are irregular; sudden or bursting unacceptable sounds. The reason for chasing is nothing more than the injury of the rolling surface, the foreign matter in the lubricant, the irregular collision of the frame and the rolling body, and the pulsed peak from the received signal. However, we are currently fulfilling The two bearing oscillation skill conditions are standardized; although Z1Z2, Z3 group and V1, V2, V3 group are divided; speed type and even three frequency bands are divided; but the values ​​are all taken as effective values ​​(basically close to the arithmetic mean ); the peak of the oscillation pulse of abnormal sounds and noises is not reflected. Exploring new ways of vibration reduction and noise reduction (1) Studying the raw materials of the tumbler grinding disc; continuously improving the quality of the tumble surface; Japan NSK Bearing Co., Ltd. has done the G5 and G10 steel balls produced by the three major steel ball factories in China in 1997. Quality survey and test; test results show that: the accuracy of China's steel ball is equal to that of Japan; however, the outer surface quality of the steel ball is uneven; the ripple peak is large; it is far worse than Japan; and we think that our steel ball retains metal research. The unique processing traces of the disc; this is to inform us; non-metallic grinding discs may get more ambitious processing texture; why not study these problems?
(2) Development of new greases. The auxiliary effect of grease reduction is very significant. NSK Japan has developed a variety of low-oscillation greases; in contrast, our lipids are less unfortunate. We should participate in large investments. Develop greases that not only oscillate but also extend the life of the dynamic function.
(3) After chemical modification; improve the quality of bearing rolling appearance; reduce oscillation; noise; improve the bearing life of the bearing together. Chemical modification refers to the chemical surface treatment of the work surface to form a chemical film; In foreign countries, it has achieved gratifying development in the test of aero-engine bearing oil cut-off; it is conceivable that it will be beneficial to reduce vibration and noise and improve the dynamic life.
.4) Studying the new type of support for vibration reduction and noise reduction; deep groove ball bearings adhere to the rack hole for many years, self-guided wave-shaped support frame; its pockets and the radial gap of the roll body; The gap is the best; the most favorable for vibration reduction; the pocket shape is good; the ellipsoid is still good; the shape is good; it has never been carefully studied; when the oscillation value of the deep groove ball bearing needs Z3 or more; 3. It is not comprehensive to think about the effect of the frame on the oscillation.
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