Focus on the Bearing Industry for 20 Years!
For general machine tools, the service life of the spindle assembly mainly refers to the service life of maintaining the spindle accuracy. Therefore, the accuracy maintenance performance of the bearing is required to meet the requirements of the service life of the spindle assembly. For heavy machine tools or power cutting machine tools, the bearing capacity of non-standard bearings should be considered first. Rolling bearings make precision parts, so it is required to be cautious when using them.
If they are not used properly, they can not achieve the expected performance effect. Therefore, the following matters should be paid attention to when using bearings: keep non-standard bearings and their surrounding environment clean. Even if the invisible smile dust enters the bearing, it will increase the wear, vibration and noise of the bearing.
It is not allowed to punch with force, directly knock the bearing with a hammer, and transfer pressure through the rolling element. Use appropriate and accurate installation tools, use special tools as much as possible, and try to avoid using cloth, short fibre and other things. To prevent the corrosion of the Timken bearing, when taking the bearing directly by hand, fully wash the sweat from your hands and apply high-quality mineral oil.
The inner diameter and outer diameter of the rolling bearing are manufactured according to the standard tolerance. The fit tightness between the bearing inner ring and the shaft, the outer ring and the seat hole can only be realized by controlling the tolerance of the journal and the seat hole. The matching of non-standard bearing inner ring and shaft adopts base hole system, and the matching of bearing outer ring and seat hole adopts machine shaft system.
With the development of science and technology, the spindle speed of machine tools is higher and higher, and the speed range is larger and larger. Therefore, the requirements for the high-speed operation stability of bearing are higher and higher.
The temperature rise of machine tool spindle bearing is an important factor to limit the bearing speed. Generally, correct selection of non-standard bearing type, tolerance grade, configuration mode, clearance (preload), lubricant and lubrication mode can improve the high-speed performance of rolling bearing to a certain extent.
To correctly select the fit, you must know the actual load conditions, working temperature and other requirements of Timken bearing, which is actually very difficult. Therefore, in most cases, the matching is selected according to the use of fine grinding. The win-win amount between the ferrule and the shaft or shell depends on the load. The heavier load adopts the larger win-win amount, and the lighter load adopts the smaller win-win amount.