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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Key skills in bearing production (3) Key skills in bearing production (3)
Trends at home and abroad Japan's major bearing companies (Seiko, Dongpu, etc.) represent the direction of bearing sealing skills. They have a long history in developing sealing skills and bearing equipment skills; the depth of the study is deep; Sophisticated. From a single sealing lip to a multi-sealing lip; from the touch seal to open a non-touch seal, etc., from the product type; ball bearings, roller bearings have. China has followed the trend of the world; also opened a seal Deep groove ball bearings, water pump bearings, railway (tapered roller) bearings, needle bearings and short cylindrical roller bearings; the deep groove ball bearings have the largest output value; the most widely used. According to the National Skills Supervision Bureau The results of China's sealed bearing quality testing results; China's sealed bearing layout design problems are large; the sealing effect is not good; the leakage of fat is more serious; the user response is fierce. After analysis; the primary reason is that China's current seal circle layout is unreasonable The inner ring does not have a sealing groove; in addition, the production precision is not advanced. Therefore, the trend of the bearing sealing skills in China is: Depicted by deep groove ball bearing; unfolding sealing skill experiment; searching for optimal sealing ring layout and optimal sealing gap, unfolding sealing data discussion; searching for wear resistance; aging resistance; resistance to high temperature and corrosion resistance; Lifetime; develop a seal that works under high temperature conditions or in a hazardous atmosphere to lay down the skill base. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The main discussion contents and guidelines are based on the current low quality of sealed bearings in China. The first discussion is: first, strengthen the research experiment; screen out the seal layout of deep groove ball bearings and develop the layout of the bearing inner ring seal groove; The current deep ditch also needs the replacement of the bearing seal layout; the competition for this type of bearing sealing function in 2005 to catch up with the world's leading level of similar products in the late 1990s, followed by the development of China's car industry; development suitable for 120 -1800C high temperature sealed bearings for long time operation at high temperature. The third is to develop a new layout of conical and cylindrical roller bearing series for railway vehicle bearings.
Noise Reduction Skills Overview Bearing noise is an important source of pollution for the environment; it is also an important guideline for bearing professional demand control; especially for home appliances; working machinery, instrumentation, and other bearing noise limits are more outstanding. For more than ten years; China's bearing occupation Many operations have been done to reduce the bearing noise; the level of noise reduction of the bearing has been greatly improved; but compared with foreign countries; there is still a certain distance; the user reflects the outstanding problem of "uneven sound"; that is, the bearing work presents an irregularity. The sudden sound; even the scream. The bearing noise has many influence factors; it is also very messy; the demand is drawn from the whole of the bearing; the inner ring, the outer ring, the cage, the tumbling body and the lubricating oil (fat) of each part of the bearing go Analyze and discuss; also need to analyze the data used in each part of the bearing, the process of the processing process and even the equipment and process materials selected in the project. This is the basic content touched by the bearing noise skill.
The development of trending skills at home and abroad is endless; although the level of bearing noise reduction of foreign leading bearing companies (NSK, SKF, etc.) is already high; however, further development directions are proposed; that is, the development of "silent" bearings; The trend of noise technology in China's bearing products in the next decade is: first, to deal with the "unusual sound" of the bearing; second, to make the level of vibration reduction a new level; that is, to catch the bearing of foreign leading industrial countries in the late 1990s s level.
The main discussion content and guidelines in order to deal with the bearing "alien sound" problem and make the level of vibration to a new level; add control amplitude limit on the skill standard; thus; the primary discussion is to improve the roundness of the external roll and the raceway ; to ensure the smoothness of the guide between the cage and the roll; together to reduce the impurity particle size of the grease (oil); the balance with the corresponding roll appearance touch. The required roll and race roughness control is 0. 001μm The impurity particles of the grease are not more than 0. 01 μm, and the roundness of the ball socket is improved; the accuracy of the turbulence between the cage and the roll body is 0.11 μm.
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Source: China Bearing Network Time: 2017-10-30