When the bearing temperature of the CNC vertical lathe is too high, there may be some problems caused by the following problems. The following are some common solutions:

1. Lubrication status check: Check the lubrication status of the bearing. Make sure the bearings are adequately lubricated to reduce friction and heat generation. Check the lubrication system, including whether the supply of lubricating oil or grease is normal, and whether the nozzle or oil circuit of the lubrication system is blocked. Use the proper lubricant according to the bearing manufacturer's recommendations, and ensure regular maintenance and lubricant changes.
2. Bearing fault inspection: Check whether the bearing is faulty. Elevated bearing temperature may be caused by bearing damage, wear, or loose internal parts. If a problem bearing is found, it needs to be replaced in time, and it must be ensured that the newly installed bearing meets the specifications and quality requirements.
3. Overload check: Check whether the machine tool is overloaded. If the machine tool is overloaded, it will cause the bearing to bear excessive load, which will cause the temperature to rise. Ensure that the machining parameters of the workpiece and tool are within the rated load capacity of the machine tool and adhere to the limits of the production run.
4. Cooling system check: Make sure the cooling system is working properly. Check for smooth flow of coolant and proper operation of pumps, radiators and lines in the cooling system. If the cooling system is faulty, it can lead to excessive bearing temperatures. Repair or replace damaged cooling system components and ensure proper coolant supply and circulation.
5. Ambient temperature control: The ambient temperature may also affect the bearing temperature. Ensure that the temperature of the working environment is within a reasonable range, and avoid excessively high ambient temperature causing the temperature of the bearing to rise. If required, consider adding additional cooling measures such as fans or cooling devices.
6. Professional maintenance support: If none of the above methods solve the problem, or there are more serious mechanical or electrical failures, it is recommended to contact professional CNC equipment maintenance personnel or the supplier's technical support team. They have the specialized knowledge and experience to perform more in-depth troubleshooting and repairs.

Please note that because the specific conditions of each CNC vertical lathe are different, it is necessary to analyze and judge according to the specific conditions when solving the problem. Follow the machine tool builder's and bearing manufacturer's recommendations, and be sure to follow safe practice when servicing or adjusting machine tools.