Ultra-high
speed machining as one of the advanced manufacturing technology, nearly
20 years in the world has been rapid development, especially in the
aerospace, automotive industry, mold processing and motorcycle industry
widely used. Spindle unit is a key component to achieve high speed. With
the development of bearing technology and lubrication technology, the
speed of the spindle is increasing year by year. The traditional
mechanical transmission has been replaced by the electric spindle
transmission mode. In order to adapt to high-speed transmission, the machine tool with a more stringent requirements:
1. Bearing size tolerance and rotation accuracy tolerance is small;
2. With angular contact ball bearings instead of cylindrical roller bearings and thrust ball bearings;
3. Reduce the radial section size to reduce the spindle system volume and is conducive to the system heat conduction;
4. As far as possible the use of small and more rolling body to
reduce the high-speed rotation inertia force and improve the shaft
stiffness;
5. The use of high-strength, lightweight cage, choose a reasonable way to guide;
6. As far as possible the use of matching bearings to ensure that the bearing rotation accuracy and stiffness.
High-speed
spindle bearings are mostly with the pressure angle of 15 or 25 angular
contact ball bearings, the accuracy level to precision (P5) and
ultra-precision (P4) based. The
main reason for the high speed performance of the angular contact ball
bearing is that the centrifugal force and the gyro torque increase on
the rolling body under high speed. Increasing centrifugal force increases the friction between the
ball and the raceway, and the increase in the gyroscope torque causes a
friction between the ball and the raceway, which increases the friction
of the bearing and reduces the bearing life.
In
order to improve the high-speed performance of the bearing, often used
in two ways: First, reduce the diameter of the ball, such as the use of
standardized 71900 series spindle bearings; the other is the use of new
ceramic (Si3N4) materials do ball, because Si3N4 ceramic The
density of the material is only 40% of the bearing steel, the friction
coefficient is low, so the high-speed performance of this bearing is
significantly higher than the steel bearings. At present, the vast majority of foreign high-speed machine tool spindle are used in this bearing.
Jintai
bearing is a professional professional precision angular contact ball
bearing manufacturer, product accuracy for the P4 | P2 level, focusing
on precision bearings R & D and manufacturing 26 years, mainly for
machine tool bearings, spindle bearings, engraving machine bearings
in-depth R & D design, life Far
more than domestic counterparts, to replace the best choice for
imported bearings, is now a number of domestic enterprises recognized
and long-term support, is the high-end CNC machine tools, engraving
machine and other equipment perfect partner!
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- ADD: No.503,Hunan International Commerce Center, Jintai Square,Changsha 410001,Hunan
- TEL: 86-731-84770165
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