What needs to be considered for the purchase of slewing bearings?
1. The bearing model: different machines need to use different models and sizes of slewing bearings, so you need to choose the right bearing model according to the specific application scenarios.
2. The quality of the bearing: you can judge the quality of the bearing by checking whether the outer package of the bearing is clear, whether the word of the anti-counterfeiting mark is clear, whether there is any noise, whether the chamfering angle is even and so on. It is recommended to choose bearings produced by regular manufacturers to ensure quality and after-sales service.
3. Bearing material: the material of the bearing has a great impact on its service life and performance, it is generally recommended to choose 42CrMo and 50Mn processing made of bearings.
4. Load force: the load force of the bearing is one of the important criteria for the selection of bearings. According to the equipment required radial load, axial load and the size of the joint load, you can choose different types of bearings. For example, when bearing radial load, you can choose cylindrical roller bearings, needle roller bearings or deep groove ball bearings; when bearing axial load, you can choose thrust ball bearings or thrust roller bearings; at the same time when bearing radial and axial load, you can choose crossed roller bearings or tapered roller bearings.
5. Speed: Different types of bearings have different limiting speeds. When choosing bearings, you need to consider the rotational speed requirements of the equipment. If the rotational speed of the bearing exceeds its limiting speed, it may lead to problems such as high bearing temperature, drying out of the lubricant used too quickly, and seizing of the bearing. Bearings lubricated with lubricant usually have a higher limiting speed.
6. Precision and clearance: Precision and clearance are also key factors to consider when selecting bearings. The rigidity, noise, life and speed of crossed rollers are all affected by the positive and negative clearance of the bearing. Therefore, it is necessary to choose the appropriate accuracy and clearance according to the specific application scenario.
7. Raceway center diameter and steel ball diameter: for single row ball type slewing bearings, raceway center diameter (D0) and steel ball diameter (d0) are two main parameters. They not only determine the bearing capacity and service life of the slewing bearing, but also the basis for the design of other parameters. Therefore, it is necessary to choose the appropriate raceway center diameter and steel ball diameter according to the specific application scenario to ensure the performance and life of the bearing.
8. Structural form: slewing bearings have different structural forms, such as single-row ball type, cross roller type, double-row ball type and three-row roller type. Different structural forms have different bearing capacity and service life, so you need to choose the appropriate structural form according to the specific application scenario.
9. Lubrication: the lubrication of the bearing has two kinds of grease lubrication and oil lubrication. Grease lubrication is suitable for low speed, light load and intermittent work occasions, while oil lubrication is suitable for high speed, heavy load and continuous work occasions. It is necessary to choose the appropriate lubrication method according to the specific application scenario.
10. Operating temperature: the operating temperature of the bearing has a great impact on its performance and life. In the selection of bearings, need to consider the operating temperature range, and choose to adapt to the temperature range of bearing materials and lubrication.
11. bearing vibration and noise: bearing vibration and noise on its performance and life also has a great impact. When choosing bearings, you need to consider its vibration and noise level, and choose the bearings that meet the requirements.
12. Mounting and dismounting: consider whether the mounting and dismounting of bearings is convenient, and whether special tools or equipment are needed. Some bearings may require specialized mounting or dismounting methods, which may increase cost and complexity.
13. Maintenance and servicing: understand the maintenance and servicing requirements of the bearings. Some bearings require periodic lubricant replacement or cleaning, while others may require more complex maintenance programs. Choosing bearings that are easy to maintain and service can reduce operating costs.
14. Environment and working conditions: consider the environment and working conditions in which the bearing will operate. For example, if the bearings will operate in a wet, corrosive or dusty environment, it may be necessary to choose bearings with special protective measures.
15. Bearing life: bearing life and its material, manufacturing process, lubrication, use conditions and other factors. When selecting bearings, you need to consider whether its life in line with the requirements of the equipment, and choose the bearings with a longer life.
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