What should I do if the bearing of machine tool becomes hot?

What should I do if the bearing of machine tool becomes hot?


Bearings are one of the most important parts of machine tools. It can be said that once the INA bearing temperature is too high, it is a more harmful fault for the rotating equipment. Improper handling will shorten the service life of the bearing and cause the bearing to burn out The normal operation of the machine tool. So what are the reasons for the heating of machine tool bearings, and how to solve it?

1. Poor bearing quality

The quality of the bearing is very important for the operation of the machine tool or the service life of the spindle. The accuracy, life and reliability of the spindle of the machine tool are largely determined by the bearing. Therefore, it is necessary to pay attention to the inspection during the purchase and acceptance of the bearing. , Adopt qualified and high-quality products from regular manufacturers.

2. Improper selection

When selecting a bearing, pay attention to the limit speed and load capacity of the bearing. It cannot be used with over-speed or over-load. This will only shorten the service life of the bearing, and the gain will not be worth the loss.

Solution: The correct adaptation and selection is the basic condition to ensure the normal operation of the equipment. You can refer to the previous post of the editor: How to choose the spindle model of the precision machine tool?


3. Poor lubrication

Lubrication has an important impact on the service life of the bearing and friction, wear, vibration, etc. Good lubrication is a necessary condition to ensure the normal operation of the bearing. According to statistics, about 40% of bearing damage is related to poor lubrication.

Solution: According to the spindle bearing structure, speed and bearing clearance, the lubricating oil well with suitable maturity should be selected. The oil must have good temperature characteristics to prevent the change of the teaching degree due to the large change of the spindle working temperature and ambient temperature. Too large affects its lubrication performance.

Fourth, improper installation

Improper installation is also an important reason for bearing heating. Because the bearing is installed correctly or not, it has a direct impact on its life and host accuracy.

Solution: During installation, the center line of the shaft and the bearing hole must be coincident. For specific installation steps, please refer to the previous recommendation of the editor: 4 configuration forms of CNC machine tool spindle bearings and their preloading methods

Five, inspection and replacement are not timely

If the bearing is found to be severely fatigued, peeling, oxidized, rusted, worn pits, cracks, or excessive noise that cannot be adjusted, if it is not replaced in time, it will cause the bearing to generate heat, abnormal noise, vibration, etc., which will affect the normal produce.

Solution: adjust the vibration, noise and lubrication of the bearing in time.

Six, wear and heat

Spindle bearings are rusty, wear, and generate heat. Prolonged fatigue use or in a humid environment may cause wear or rust on all parts of the spindle; long-term storage without use can also cause bearing rust.

Solution: Clean the bearing, adjust the grease or replace the bearing.

Seven, insufficient cooling

The usual manifestations of insufficient cooling include: pipeline blockage, improper selection of cooler, poor cooling effect, etc.

Solution: The cooler has serious scaling and frequent alarms for excessively high bearing temperature are encountered in many production sites. A more effective solution is to pickling and descaling the cooler before the summer.

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