Machine tool bearing is an important part of machine tool equipment, and its precision grade and selection directly affect the running accuracy, stability and life of the machine tool. This article will introduce the precision grade and selection principle of machine tool bearings in detail to help readers better understand and choose suitable bearings.
The accuracy grade of machine tool bearings is divided into several grades, mainly including P0, P2, P4, P5 and so on. Bearings with different precision grades have different characteristics and scope of application.
P0 bearing: P0 bearing is a bearing of ordinary accuracy grade, which is suitable for machine tool equipment with general requirements. Its accuracy requirements are low, and it can meet the needs of most ordinary mechanical equipment.
P2 bearing: P2 bearing is a high precision grade of bearings, suitable for machine tools and equipment with certain requirements for accuracy. Its precision requirements are high, and it can meet the needs of high-precision mechanical equipment.
P4 bearing: P4 bearing is a high precision grade of bearings, suitable for machine tool equipment with high precision requirements. Its precision requirements are very high, and it can meet the needs of high-precision mechanical equipment.
P5 class bearings: P5 class bearings are the highest precision class bearings, suitable for machine tool equipment with high precision requirements. Its precision requirements are extremely high, and it can meet the needs of extremely high precision mechanical equipment.
It should be noted that the price of bearings with different precision grades is also different, and in general, the higher the accuracy grade, the more expensive the price. Therefore, in the selection of bearings need to be weighed according to actual needs.
When selecting machine tool bearings, the following principles need to be considered:
Priority is given to standard bearings: standard bearings are rigorously tested and verified, and can meet the needs of most mechanical equipment. Therefore, when selecting bearings, priority should be given to standard bearings.
Select the right type of bearing according to the speed: Different types of bearings are suitable for different speed ranges. When selecting bearings, the appropriate type needs to be selected according to the actual speed.
Avoid using too large or too small bearings: too large or too small bearings will affect the running accuracy and stability of the machine tool. When choosing bearings, it is necessary to choose the appropriate size according to the actual needs.
Bearing capacity and life: Bearing capacity and life are important factors to consider when selecting bearings. When choosing bearings, it is necessary to choose the appropriate bearing capacity and life according to the actual needs and working environment.
Consider the sealing and lubrication mode of bearings: the sealing and lubrication mode of bearings are also factors that need to be considered when selecting bearings. When selecting bearings, it is necessary to choose the appropriate sealing and lubrication method according to the actual needs and working environment.
Taking the spindle bearing of a machine tool as an example, the spindle speed of the machine tool is 10000r/min, which needs to withstand large radial and axial forces, and has high accuracy requirements. According to the above conditions, P4 angular contact ball bearings can be selected as main shaft bearings. This type of bearing is suitable for high-speed operation, bearing large radial and axial forces, while having high accuracy and long life.
This paper introduces the precision grade and selection principle of machine tool bearings. Bearings with different precision grades have different characteristics and application ranges, and need to be selected according to actual needs. When choosing bearings, you need to consider a variety of factors, such as speed, bearing capacity, life, sealing and lubrication. Through the reasonable selection and use of bearings, the running accuracy and stability of the machine tool can be improved, and the service life can be extended.
