How to choose rolling bearings for ordinary lathes

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

How to choose rolling bearings for ordinary lathes?

① The magnitude, direction and nature of the load.Ball bearings are suitable for light loads, while roller bearings are suitable for heavy loads and shock loads.When the rolling bearing bears pure axial load, thrust bearings are usually selected; when the rolling bearing bears pure radial load, deep groove ball bearings or short cylindrical roller bearings are usually selected.When the rolling bearing bears pure radial load and the axial load is small, deep groove ball bearings, angular contact ball bearings, tapered roller bearings and self-aligning ball or self-aligning roller bearings can be selected.When the axial load is large, you can choose angular contact ball bearings and tapered roller bearings with larger contact angles, or a combination of radial bearings and thrust bearings, especially suitable for extremely high axial loads or for higher axial rigidity. High special requirements.

②The allowable rotational 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 the limit speed.

③ When the rigid bearing is loaded, the contact between the bearing ring and the rolling elements will be elastically deformed.The amount of deflection is proportional to the load, and this ratio determines the stiffness of the bearing.Usually, the stiffness of the bearing can be increased by preloading the bearing.In addition, in the design of bearing support, considering the combination and arrangement of bearings can also improve the support stiffness of bearings.

④ Self-aligning performance and installation error After the bearing is installed in the working position, the installation and positioning are usually poor due to manufacturing errors.At this time, due to the degree of fishing and the thermal expansion of the shaft, the bearings are often subjected to excessive loads, resulting in early damage.Self-aligning bearings can overcome defects caused by installation errors by themselves, so they are suitable bearings for this purpose.

⑤Installation and disassembly of tapered roller bearings, needle roller bearings, etc. are bearing types with separable inner and outer rings (so-called separable bearings), which are easy to install and disassemble.

⑥Marketability Even bearings for horizontal lathes listed in the catalog may not be sold in the market; on the contrary, some bearings not listed in the catalog are mass-produced.Therefore, it should be clear whether the bearings used are readily available.