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Analysis: High-speed spindle bearing skills 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. It is followed by the development of high speed; about high-efficiency machining machine. The ceramic material is used for the rolling body; the dmN value is about 20×104; the dmN value is about 100×104 under the condition of grease smoothness. The middle of processing is increasing; 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.
Under the condition of grease smoothness, the dmN value is below 50×104. After the oil and gas is declared smooth, it is gradually opened to announce the smooth system that is used to it. 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 the speed r/min. The dmN value has reached 100×104. Since then, the bearing has been announced as a ceramic angular contact ball bearing; the dmN value is 200×104×90, and the eruption is announced. After smoothing; the dmN value can reach 300×104.
2 high speed spindle bearing skills:
(1) 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 curvature (or mass) of the ball to change the curvature coefficient of the channel; Centrifugal force; reduce the internal load that occurs when working at high speed; add the number of balls together to improve rigidity.
(2) Ceramic ball angle touch ball bearings:
Hybrid ceramic ball bearings with silicon nitride (Si3N4) ceramics for roll-only systems are introduced; in order to reduce ball quality and improve speed, its function is comparable to high-speed spindle bearing materials; ceramic (Si3N4) has the following advantages: roll body at high speed rotation Centrifugal force occurring. Clam shell. Because the density is smaller than that of bearing steel. The rotating torque can be reduced. The tip of the wire is more than the hip. The excellent thermal conductivity makes the roll of ceramic material not easy to adhere to metal at high speed. .Smooth conditions are better in the case of burns; burns. Thermal expansion. Peptide 谌哟ナ 灰 灰 灰 ( 5 5 5 5 5 5 5 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承. The rigidity of the spindle has also been improved. In summary; therefore, the ceramic material (Si3N4) is selected as the rolling body; the speed can be improved by about 25% compared with the bearing steel rolling body, and the life expectancy can be improved by about 3 times.
(3) New hybrid angular touch ball bearings:
The inner ring expands 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 fixed preload. 1. 2 times.
(4) Mixed 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 high-speed spindle bearing smooth:
Because it is simple and economical, it is widely used; the trend of high-speed spindle bearing development puts higher demands on smoothness. It saves grease with dmN value below 50×104; it is widely used because of its simple and economical use; Unique protection; no need to make up for it; most of them are life-smooth. Advance with speed; dmN value is more than 100×104, oil and oil mist are smooth; compared with grease smoothness; temperature rises.饕娜蠡椒. And the spray shines although the dmN value can reach 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 the smoothness is usually not used. Method.

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