There may be many reasons why the CNC lathe guide bearing temperature is too high. The following are common reasons and corresponding treatment methods:

1. Poor lubrication: Insufficient lubrication of the guide bearing or substandard lubricating oil quality will lead to increased friction, which in turn will cause the temperature to rise. The solution is to ensure that the guide bearing is adequately lubricated, check the working status of the lubrication system, and replace or add appropriate lubricating oil in time.
2. Over-tight bearing clearance: Over-tight bearing clearance will cause increased friction and increase temperature. The solution is to check the bearing clearance and adjust it to the appropriate range.
3. Circulation system problems: If there are problems with the circulation system of the CNC lathe, such as cooling system failure or insufficient coolant flow, the temperature of the guide bearing will increase. The solution is to check and repair the circulation system failure to ensure the normal circulation and supply of coolant.
4. Problems in the cutting process: If the cutting parameters are set incorrectly during the cutting process, such as too fast a feed speed, too large a cutting depth, or too high a rotational speed, the temperature of the guide bearing may rise. The treatment method is to adjust the cutting parameters according to the process requirements to ensure that the cutting process is reasonable.
5. Machine tool structural problems: Problems such as insufficient machine tool structural rigidity, bearing damage or poor installation may also cause the guide bearing temperature to be too high. The solution is to inspect and maintain the machine tool structure, repair or replace damaged bearings, and ensure that the bearings are installed correctly.
6. The ambient temperature is too high: High ambient temperature will also cause the temperature of the guide bearing to increase. The solution is to reduce the ambient temperature by adding cooling equipment, such as cooling fans or coolers.

In short, solving the problem of excessive guide bearing temperature requires comprehensive consideration of factors such as lubrication, bearing clearance, circulation system, cutting technology, machine tool structure and environment. In actual operation, it is recommended to check one by one according to the specific situation and take corresponding treatment methods to ensure the normal operating temperature of the guide bearing. If the problem cannot be solved by yourself, it is recommended to consult professional machine tool maintenance personnel or the manufacturer's technical support.