High-end research and development of “Machine tool spindle bearing series”

• Research topic:
  High-end research and development of "Machine tool spindle bearing series"
• Cooperation unit:
   Independent research and development
• Research and development achievements:
  "high-end machine tool spindle bearings" replace imports to achieve localization
• Research:
  First, high precision: the bearing accuracy on the spindle of precision machine tools should be P5 and above, and for the spindle support of high-speed and high-precision machine tools such as CNC machine tools, it is necessary to develop P4 and higher-level ultra-precision bearings. Second, long life: the service life of the spindle bearing of the machine tool is usually not according to the fatigue life but according to the precision life (or wear life) to assess, this is because the contact stress of the spindle bearing rolling body and raceway is generally lower than its fatigue limit, and the lubrication, sealing and other operating conditions are relatively good, that is, it is considered to be in the "ideal state" of the bearing. Therefore, in the main shaft bearing design, the stiffness is the primary objective function.

In the process of high-end research and development of the "machine tool spindle bearing series", the focus has broken through the two major technical problems of high precision and long life. First of all, the R&D team of Hebei Bearing Industry Technology Research Institute has successfully designed and manufactured bearings with P5 and above accuracy that can meet the requirements of precision machine tool spindles, as well as ultra-precision bearings with P4 and even higher accuracy that are suitable for high-speed and high-precision machine tool spindles such as CNC machine tools. These bearings can maintain high accuracy under high load and high-speed rotation conditions, meeting the strict requirements of modern machine tools for machining accuracy.

Secondly, in view of the service life of the spindle bearing of the machine tool, the R & D team used the bearing stiffness as a key objective function in the design, and optimized the structure and material of the bearing. By improving the design and manufacturing process of the bearing, the wear resistance and fatigue resistance of the bearing are improved, and the precision life and service life of the bearing are significantly improved. This not only extends the service life of the machine tool, but also reduces the maintenance cost and improves the working efficiency and reliability of the machine tool.

Through these technological innovations, the "high-end machine tool spindle bearings" developed have been able to replace imported products and achieve localization, which is of great significance for enhancing the core competitiveness of the domestic machine tool manufacturing industry.