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High-speed spindle bearings further improve the mechanical and thermodynamic load-bearing capacity of the electric spindle through optimized design, and greatly improve the productivity and competitiveness of customers. High-speed spindle bearings perfectly combine the high-speed performance of the small ball series with the rigidity and load-bearing capacity of the large ball series by selecting the appropriate ball diameter, tightness and internal radial clearance. The small ball bearing series usually used in motor spindle have a large contact angle, which can effectively prevent thermal limitation during operation. Bearing with 25° contact angle can support higher axial forces than 15° contact angle.

While the CNC machine tool  spindle is developing in the direction of high speed and precision, it is required to improve its processing accuracy and production efficiency. The key to realizing these technologies is closely related to high-speed precision bearing technology. At the same time, in order to meet the requirements of high stiffness and low temperature rise of the spindle, the multi-link back-to-back assembly structure of angular contact ball bearings is often used to increase the support span and stiffness of the spindle bearing. In order to achieve more superior performance of the electric spindle, hybrid ceramic ball bearings are widely used in electric spindles. Because of their own special properties, such as the use of silicon nitride ceramic balls for rolling elements and high nitride alloy steel for bearing rings, they are cheap, have low weight and long life. More importantly, the changes to the machine tool mechanism are not significant, and the high degree of standardization also facilitates later maintenance, so this type of bearing is more suitable for high-speed electric spindles. As mentioned in the previous cooling technology, reducing the total friction torque, that is, reducing the friction between the rolling element and the raceway, can control the temperature rise of the bearing, thereby achieving high-speed performance of the spindle, so hybrid ceramic ball bearings are the first choice for realizing this series of technologies. With the development of machine tool technology, the speed of the spindle is getting higher and higher. A key link in achieving high-speed cutting is the development of high-speed precision spindle bearings. Common high-speed rolling bearings have contact angles of 15° and 25°. One is a small steel ball bearing with a reduced steel ball diameter and increased number of steel balls; the other is a small ceramic ball bearing; there are also ceramic ball bearings with the same size as ordinary bearing balls. This type of bearing is only a ceramic ball, and the inner and outer rings are still made of bearing steel, so it is called a hybrid ceramic ball bearing. High-speed electric spindles have very strict and even harsh requirements for their bearing and motor performance. High-speed bearings need to have good rigidity, damping resistance and long service life. There are usually three options: dynamic and static pressure bearings, composite ceramic bearings or electromagnetic suspension bearings. Among them, composite ceramic bearings use hot-pressed ceramic balls and steel bearing rings. Because of their heat resistance and wear resistance, high standardization and easy maintenance, they are most widely used in electric spindle units.

Our company has professional sales and technical engineers who are responsible for providing users with technical consultation, technical services and product technical training on precision bearing information and installation and use. Perfect pre-sales, sales and after-sales services constitute a guarantee system for high-quality services, providing users with reliable bearing products and creating excellent user experience and rich benefits for every customer.

If you have any questions about products and services, please contact the company's service department directly.


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SelectDownloadInquiry Bearing Code Dimensions(mm)Preloading Force FVUnloading Force KaEAxial Rigidity Sa (N/µm)Weight
dDBsmin1sminLMHLMHLMHkg
Download PDF B71944C.T.P4S 220 300 38 2.1 1.1 1191 3942 8140 3646 12940 28444 196.9 331.8 474 6.7
Download PDF B71944E.T.P4S 220 300 38 2.1 1.1 1714 6084 12867 4995 18257 39642 463.3 741.8 999.9 6.7
Download PDF HCB71944C.T.P4S 220 300 38 2.1 1.1 618 2176 4593 1861 6882 15259 171.7 284.2 396.9 5.6
Download PDF HCB71944E.T.P4S 220 300 38 2.1 1.1 799 3255 7114 2334 9694 21583 402.2 663.1 889.5 5.6
Download PDF B7044C.T.P4S 220 340 56 3 3 1916 6138 12545 5866 20139 43737 211 350.6 497.4 16
Download PDF B7044E.T.P4S 220 340 56 3 3 2901 9725 20159 8461 29193 62166 505.7 793.3 1061 16
Download PDF B7244C.T.P4S 220 400 65 4 4 2406 7621 15567 7360 24861 54043 225.4 371.1 525.7 33.6
Download PDF B7244E.T.P4S 220 400 65 4 4 3670 12081 24979 10706 36160 76950 542.6 843.8 1127 33.6
Download PDF B71848C.TPA.P4 240 300 28 2 1 493 1763 3743 1501 5795 13170 156 272.7 397 3.9
Download PDF B71848E.TPA.P4 240 300 28 2 1 613 2571 5687 1773 7681 17504 348.3 592.4 814.5 3.9
Download PDF HCB71848C.TPA.P4 240 300 28 2 1 271 1084 2370 813 3448 7964 139 243.9 349 3.9
Download PDF HCB71848E.TPA.P4 240 300 28 2 1 282 1519 3561 819 4515 10824 301.7 549.2 759.1 3.9
Download PDF B71948C.T.P4S 240 320 38 2.1 1.1 1230 4079 8431 3759 13355 29363 207.8 349.8 499.1 7.2
Download PDF B71948E.T.P4S 240 320 38 2.1 1.1 1768 6303 13347 5149 18893 41059 489.6 784.5 1057.1 7.2
Download PDF HCB71948C.T.P4S 240 320 38 2.1 1.1 632 2237 4729 1900 7059 15665 180.7 299.2 417.4 6
Download PDF HCB71948E.T.P4S 240 320 38 2.1 1.1 794 3280 7196 2318 9755 21789 419.8 694.6 932 6
Download PDF B7048C.T.P4S 240 360 56 3 3 1971 6321 12923 6028 20706 44965 219.7 364.8 517.2 17
Download PDF B7048E.T.P4S 240 360 56 3 3 2933 9860 20455 8547 29565 62978 523.7 821.7 1098.4 17
Download PDF B71952C.T.P4S 260 360 46 2.1 1.1 1625 5291 10870 4955 17278 37700 222.8 371.5 527.4 12.1
Download PDF B71952E.T.P4S 260 360 46 2.1 1.1 2393 8255 17265 6977 24698 53045 530.5 838.7 1124.2 12.1
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