What to do if the temperature of CNC machine guide bearing is too high?

Numerical control lathe guide bearing usually by thin oil lubrication bearing, its composition is mainly composed of bearing cover, tubing, cooler, oil box, bearing, bearing, thermometer and carrying screw, two unit guide sleeve is commonly 8, according to the circular uniform distribution on the generator main journal, in the process of the use of the numerical control lathe, hard to avoid can appear some fault, CNC lathe guide bearing temperature is too high, burning tile is one of the common problems, the following is a brief introduction to the cause of high temperature guide bearing and how to solve this kind of failure.

The main purpose of the CNC lathe guide bearing is to limit the work of the main shaft of the generator, so that it can only be in the specified guide bearing clearance range with the radial load on the main shaft of the generator.

The reasons for the high temperature of the guide bearing are as follows: First, the contact point of the surface of the shaft tile is relatively small, so that the contact surface is insufficient and does not meet the requirements of the equipment specifications. Second, increase the clearance of the bearing is far greater than the required clearance at the time of design, so it will make it difficult for lubricating oil to enter the bearing surface, it is not easy to form an oil wedge, resulting in poor lubrication, leading to further increase in the temperature of the guide bearing, the vibration of the unit increases.

According to the design requirements of machine tool factory, when the CNC lathe is working continuously, the temperature of cooling water can not exceed 25 degrees, and the temperature of ceramic tile and oil can not exceed 65 degrees. The variation of oil temperature and wattage is not only related to the temperature of cooling water, but also to the circulation of lubricating oil and the clearance between spindle and journal. For CNC lath-oriented bearings, clearance of 0.2 to 0.3mm can be allowed, and the lower part of the bearing is immersed in the lubricating oil. When the spindle runs clockwise, the lubricating oil is easier to enter the bearing surface of the guide bearing, and the oil wedge is generated. When lubricating ceramic tile surface, which is the biggest swing of through spindle points, although its minimum matching gap, however, due to the short distance, good lubrication condition, the friction heat is small, the cooling effect is better also, usually will not cause bearing temperature rise, also won't lead to ceramic tile burning problems.

What are the reasons for the unstable machining accuracy of CNC lathes?
How to determine the route of nc lathe processing tool retreat?