How to choose the rolling bearing of ordinary lathe

There are many types of rolling bearings, and the following factors can be considered when selecting.

How to choose the rolling bearing of ordinary lathe?

①The magnitude, direction and nature of the load. Ball bearings are suitable for light loads, and roller bearings are suitable for heavy loads and impact loads. When the rolling bearing is subjected to pure axial load, the thrust bearing is generally selected; when the rolling bearing is subjected to pure radial load, the deep groove ball bearing or short cylindrical roller bearing is generally selected; when the rolling bearing is subjected to pure radial load, there is little When the axial load is higher, you can choose deep groove ball bearings, angular contact ball bearings, tapered roller bearings and self-aligning ball or spherical roller bearings; when the axial load is large, you can choose the angular contact with larger contact angle Ball bearings and tapered roller bearings, or a combination of radial bearings and thrust bearings, are particularly suitable for extremely high axial loads or special requirements for greater axial rigidity.

②The allowable speed varies greatly depending on the type of bearing. Generally, bearings with low friction and low heat generation are suitable for high speeds. In the design, the rolling bearing should work under the condition of lower than its limit speed.

③When a rigid bearing bears a load, elastic deformation will occur at the contact between the bearing ring and the rolling element. The amount of deformation is proportional to the load, and the ratio determines the rigidity of the bearing. Generally, the rigidity of the bearing can be improved by preloading the bearing; in addition, in the bearing support design, considering the combination and arrangement of the bearing can also improve the support rigidity of the bearing.

④ Self-aligning performance and installation error After the bearing is installed in the working position, the installation and positioning are often poor due to manufacturing errors. At this time, the bearing is often subjected to excessive load due to the degree of fishing and thermal expansion of the shaft, causing early damage. The self-aligning bearing can overcome the defects caused by the installation error by itself, so it is a bearing suitable for this purpose.

⑤Installation and disassembly of tapered roller bearings, needle roller bearings, etc., belong to the type of bearing with separable inner and outer rings (the so-called separate bearing), which is convenient for installation and disassembly.

⑥Marketability Even the horizontal lathe bearings listed in the product catalog may not be sold on the market; on the contrary, some bearings not listed in the product catalog are produced in large quantities. Therefore, it should be clear whether the bearings used are easily available.