Machine with a high-speed spindle bearing technology introduced

Web Design And Seo For www.china-webdesign.com

ball bearing supplier - China Manufacturer

Thank you for inquiry my ball bearing supplier, Tel: 0379-64331653, E-mail: info@lyvsg.com

http://www.lyvsg.com/key-ball-bearing-9/

Machine tool technology introduction (with a high-speed spindle bearings, machine tool bearings):
To improve the speed of spindle bearings are critical to achieve high-speed practical spindle. With the speed of development, for the efficien t processing machine. Ceramic rolling element material the dmN value of about 20 × 104, 100 × 104 greased dmN value CNC machining centers is increasing, and has become a trend, the use of oil and gas, and oil mist lubrication method will also be The high-speed machine tool spindle bearing lubrication direction of development.
The development of a high-speed spindle bearings:
Generally use more rigid and high-speed performance of angular contact ball bearings, high-speed requirements in order to adapt to the machine spindle. Followed by the use of cylindrical roller bearings.
The greased conditions dmN 50 × 104. Develop oil lubrication, at the same time gradually developed with suitable lubrication system. Describes the spindle bearings, high-speed performance dmN value (dm bearing pitch diameter mm × N speed r / min of view. DmN value has reached more than 100 × 104. Later they developed the bearing rolling element ceramic corn er contact ball bearings, the spray lubrication dmN value of 200 × 104 × 90 s development, dmN value up to 300 × 104.
2 high-speed spindle bearing technology:
(1) high-speed angular contact ball bearings:
Single row, double row cylindrical roller bearings angular contact ball bearings are inferior in terms of high-speed performance. Angular contact bearings with a contact angle of bearing can be seen tapered roller bearings. The larger the contact angle, the better the axial stiffness, but because the gyroscopic slide and spin sliding between the ball and raceway is also large, so the heat will also increase. In order to improve the speed performance of the method is to reduce the size of the ball (or quality) to change the curvature of the channel coefficients, to reduce the centrifugal force of the ball, reducing the internal load is generated when the high-speed operation, while increasing the number of balls to increase rigidity.high speed bearing
(2) ceramic ball angular contact ball bearings:
Introduced only scroll system ceramic hybrid ceramic ball bearings with silicon nitride (Si3N4), in order to reduce the ball quality to improve speed. Comparison of the performance
Ceramic (Si3N4) as a high-speed spindle bearing material has the following advantages: the centrifugal force generated by high speed rotation of the rolling body is small, light weight. As the density is smaller than the bearing steel. The rotational torque can be reduced, thus reducing the temperature rise, and increased life expectancy. The good thermal conductivity of the ceramic material of the rolling bodies in the high-speed operation is not easy to generate adhesion with the metal. Lubrication conditions better resistance to burn, a burn. The thermal expansion is small, the rolling body is brought into contact with the inner ring is not easy to preload occurs due to increased clearance decreases. Bearing deformation is small, due to the high hardness, good rigidity. The rigidity of the spindle is also improved. In summary, therefore, the use of ceramic materials (Si3N4) as the rolling bodies, the rolling bodies of the bearing steel can be increased to about 3 times the life of the speed can be increased from about 25% to about 35% compared to.
(3) new hybrid angular contact ball bearings:
The inner ring expansion, high-speed rotation due to the centrifugal force generated. Rolling element contact stress becomes large, the internal pre-load increase, clearance smaller, fever, increase. To solve this problem, recently developed a new hybrid ceramic ball bearing inner ring of stainless steel. Because the stainless steel coefficient of linear expansion than 20% smaller bearing steel which can further control bearing in a high-speed rotation of the inner ring expansion caused by the pre-load is increased. Plenty of lubrication conditions, fixed preload dmN value can be increased by 1.2 times.
(4) the inner ceramic hybrid angular contact ball bearings:
Recent information on positioning preload tight. The inner ring is also hybrid angular contact ball bearings with ceramic materials. Because the inner ring is also used a ceramic material, the bearing inner or raceway centrifugal expansion is small, the increase of the preload also smaller, coupled with good rigidity, the ball and raceway contact area is small, so the heating and expansion is also small, could be compared only ball ceramic bearings to achieve higher speed. But it is precisely because of the high-speed rotation, centrifugal and expansion of small If it is too large, and co-ordination between the metal spindle stress may destroy or even shatter. machine bearing
3 high-speed spindle bearing lubrication:
Due to the use of a simple, econo mical and widely used, the development trend of high-speed spindle bearings put forward higher requirements for lubrication. Greased the conservative dmN value in less than 50 × 104, due to the use of simple, economical and widely used, and no special maintenance, also without subsequent supplementary, most lifelong lubrication. With the speed increase, oil and gas and oil mist lubrication dmN value of 100 × 104, compared with the grease, the temperature rise can rotate at a higher speed, and thus become the main method of lubrication. Jet lubrication Although dmN values ??up to 250 × 104 but requires a lot of lubricating oil, stirring resistance power greater losses, and ancillary equipment requires more complex, higher interest rates, it is generally not use this lubrication.