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Skill analysis of high speed spindle bearings for machine tools

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Skill analysis of high-speed spindle bearings for machine tools (machine tool bearings):
The speed of the spindle bearing is improved. It is the key to complete the high-speed useful spindle. Following the development of high-speed machine; about high-efficiency machining machine. The ceramic material is used for the rolling body; the dmN value is about 200 104; the dmN value is about 100 104 in the middle of CNC machining under the condition of grease smoothness. It is becoming more and more added; it has become a development trend; the selection of oil and oil and oil mist smoothing methods will also become the smooth development direction of high-speed machine tool spindle bearings.
1 High-speed spindle bearing development status:
Usually use the angular and angular ball bearings with excellent rigidity and high speed function; in order to get used to the high speed demand of the machine tool spindle. Secondly, the cylindrical roller bearing is used.
The dmN value under the condition of grease smoothing is below 50 104. After the oil and gas is declared smooth, the smoothing system is gradually announced. The dmN value of the high-speed function of the spindle bearing is expressed (dm is the diameter of the bearing pitch circle mm N is From the speed r / min point of view. dmN value has reached more than 100 104. Since then, the bearing has been announced to roll the ceramic ball angular contact ball bearing; completed the dmN value of 200 104 90 era to announce the gliding after sliding; dmN value Can reach 300 104
2 high speed spindle bearing skills:
High-speed angular touch ball bearings:
Single row and double row cylindrical roller bearings are inferior to angular touch ball bearings in terms of high speed function. Angle touch bearings are bearings with touch angles; tapered roller bearings can be seen. The greater the touch angle, the better the axial stiffness; The gyro sliding and the spin sliding between the ball and the raceway are also large; therefore, heat is also added. In order to improve the speed function; the method is to reduce the size (or mass) of the ball to change the curvature coefficient of the channel; Centrifugal force; reduce the internal load that occurs during high-speed operation; add the number of balls together to improve rigidity.
Ceramic ball angle touch ball bearings:
Introduced silicon nitride (Si3N4 ceramic hybrid ceramic ball bearing) for roll-only system; in order to reduce the ball quality to improve speed. Its function is comparable.
Ceramic (Si3N4 has the following advantages: as a high-speed spindle bearing material.
Centrifugal force of the rolling body during high-speed rotation. Clam shell. Because the density is smaller than the bearing steel. The rotation torque can be reduced.
Outstanding thermal conductivity makes the ceramic material's roll body not easy to adhere to the metal at high speed. It is resistant to burns under smooth conditions.
Presenting burns. The degree of thermal expansion. When the roll and the inner ring are touched, it is not easy to add pre-tightening force to increase the clearance.
The deformation of the bearing. 捎谟 雀 8 8 8. Recruitment. The rigidity of the spindle has also been improved.
In summary; therefore, the choice of ceramic materials (Si3N4 as a rollover; compared with bearing steel rollover speed can be improved by about 25% 35% life can be improved by about 3 times.
New hybrid angle touch ball bearings:
The inner ring is inflated due to the centrifugal force; the high-speed rotation and the rolling body touch stress become larger; the internal preload is added, the clearance becomes smaller, and the heat is added. To solve this problem; the new type of inner ring is declared as stainless steel. Ceramic ball bearing. Because the linear expansion coefficient of stainless steel is 20% smaller than that of bearing steel, it can further control the preload added by the inner ring expansion when the bearing rotates at high speed. The smooth condition is sufficient; the dmN value can be improved under the fixed preload. 1. 2 times.
Hybrid angle touch ball bearings with inner ring of ceramic:
Positioning preloaded tight condition; there is material analysis. The inner ring also uses ceramic material mixed angular contact ball bearing. Because the inner ring also uses ceramic material; the bearing inner diameter or raceway centrifugal expansion. Leisure. Also recruited 茫 蚝 蚝 蚝 龅 龅 龅 龅 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑 苑.鹗糁浦嶂涞呐浜嶂涞呐浜嶂涞呐浜αθ绻缶涂赡懿 瞪踔 瞪踔 榱.
3 Smoothing of high speed spindle bearings:
Because it is simple and economical, it is widely used. The trend of high-speed spindle bearings has a higher demand for smoothing. It has a smooth dmN value below 50 104. It does not require unique protection; it does not require subsequent compensation; most of them are Lifetime smooth. With the speed of progress; dmN value of 100 104 or more when the choice of oil and oil and oil mist smooth; compared with grease smooth; temperature rise. 芄 灰 咚俣 咚俣 咚俣 咚俣 咚俣 咚俣 咚俣 咚俣 而 而 而 而 而 而 而 而 而 而 而 而 而 而 而 尽管 尽管 尽管 尽管 尽管 尽管 尽管 尽管 尽管It reaches 250 104 but requires a lot of smooth oil; the power loss is large due to the mixing resistance; and the demanding equipment is more messy; the interest is higher; so this smooth method is usually not used.
CNC machine tools and machining centers using ceramic tumbling, oil and gas and oil mist smoothing methods for high-power electric spindles account for about 85% of the entire machine tool. From the 18th Tokyo (1996) and the 19th Osaka (1998) world Look at the machine tools exhibited at the Machine Tool Expo.

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