随着机床技术的发展，主轴转速越来越高。目前，普通高速主轴大多数角接触球轴承的接触角为15度和25度。
With the development of machine tool technology, spindle speed is higher and higher. At present, the contact angles of most angular contact ball bearings of ordinary high speed spindle are 15 degrees and 25 degrees.
15°接触角的江苏NSK轴承转速较高，但轴向承载力和刚度较低。一般来说，大多数磨削、铣床和高速加工中心使用角接触角为15度的角接触球轴承。随着主轴转速的进一步提高，这种轴承往往不能满足要求。必须开发新的超高速轴承。
The 15 degree contact angle of Jiangsu NSK bearing has higher rotational speed, but the axial bearing capacity and stiffness are lower. Generally speaking, most grinding, milling machines and high speed machining centers use angular contact ball bearings with angular contact angles of 15 degrees. With the further improvement of spindle speed, this bearing often can not meet the requirements. New super high speed bearings must be developed.
在15°接触角下，江苏NSK轴承在光预紧和润滑脂作用下的DMN值可达到1×106mm r/min，在油气润滑下可达到1.4×106mm／r/min。如果DMN值太高，由于离心力大，球与外圈滚道之间的接触压力将非常大，从而降低轴承的寿命。
Under the contact angle of 15 degrees, the DMN value of Jiangsu NSK bearing can reach 1 x 106mm r/min under the action of light pretightening and lubricating grease, and it can reach 1.4 * 106mm / r/min under oil and gas lubrication. If the DMN value is too high, due to the large centrifugal force, the contact pressure between the ball and the outer race raceway will be very large, thus reducing the life of the bearing.
在江苏NSK轴承离心力作用下，球与滚道的接触角减小或甚至减小到零，球与内圈滚道的接触角增大。前者减小了轴承的轴向刚度，后者降低了径向刚度。此外，过快的旋转速度会在球上产生较大的陀螺力矩，从而增加热量并在笼上产生附加应力。
Under the centrifugal force of NSK bearing in Jiangsu, the contact angle between ball and raceway decreases or even decreases to zero, and the contact angle between ball and inner race raceway increases. The former reduces the axial stiffness of the bearing, and the latter reduces the radial stiffness. In addition, excessive rotational speed will produce larger gyroscopic moments on the ball, thereby increasing heat and producing additional stresses on the cage.
因此，为了进一步提高江苏NSK轴承速度，必须降低球的质量。近年来国外已经发展了两种超高速轴承，接触角为15度。一个是球轴承，球直径比普通轴承小，另一个是陶瓷球轴承。
Therefore, in order to further improve the speed of NSK bearing in Jiangsu, we must reduce the quality of the ball. In recent years, two kinds of ultra high speed bearings h***e been developed abroad, and the contact angles are 15 degrees. One is ball bearing, the ball diameter is ***aller than common bearing, and the other is ceramic ball bearing.
它不仅直径小，而且还用于陶瓷（内外环仍然是钢）。外形尺寸与一般的角接触轴承相同，可以互换。当然，陶瓷内环和圆柱陶瓷轴承是***近发展起来的。
It is not only ***all in diameter, but also used in ceramics (inner and outer rings are still steel). The outline size is the same as the general angular contact bearing, and it can be interchanged. Of course, ceramic inner rings and cylindrical ceramic bearings h***e been developed recently.
由于小滚珠的存在，江苏NSK轴承的承载能力下降。与普通轴承相比，额定动载荷降低约40%。然而，考虑到机床主轴的负荷较小，高速主轴的负荷较轻，所以没有问题。
Due to the existence of ***all balls, the bearing capacity of NSK bearing in Jiangsu has decreased. Compared with ordinary bearings, the rated dynamic load is reduced by about 40%. However, c***idering that the load of the spindle of the machine tool is ***all, the load of the high speed spindle is lighter, so there is no problem.
球很小，球的数量增加了。江苏NSK轴承的刚度与球直径的1/3的功率和球数的2/3的功率成正比。因此，轴承的刚度也得到了改善。尤其对于陶瓷球轴承，陶瓷的弹性模量约为3.14×105MPa，比钢（2.08x105）高约50%，因此硬度较高。
The ball is ***all and the number of balls increases. The stiffness of NSK bearing in Jiangsu is directly proportional to the power of 1/3 and the power of 2/3 of ball number. Therefore, the stiffness of the bearing has also been improved. Especially for ceramic ball bearings, the modulus of elasticity of ceramics is about 3.14 x 105MPa, which is about 50% higher than steel (2.08x105), so the hardness is higher.
文章来自：江苏SKF轴承 www.wh-
The article comes from: Jiangsu SKF bearing www.wh-
文章来自：江苏INA轴承 a-
The article comes from: Jiangsu INA bearing a-
文章来自：江苏NSK轴承
The article comes from: Jiangsu NSK bearing