What are the requirements of the spindle for rolling bearings in aluminum cavity CNC machining?

The main component of CNC machining of aluminum cavity is the spindle assembly of the machine tool. The spindle assembly is also composed of a spindle, a bearing, a transmission part mounted on the spindle, and some fasteners. Among them, the main shaft has an important influence on the rolling bearing, which will also affect the quality and production efficiency of the processed parts. What is the basic requirement?

1. Rotation and temperature rise. Science is developing and technology is advancing. The spindle speed of machine tools is getting higher and higher, and the speed range is getting wider. Therefore, the requirements for the stability of bearings at high speeds are getting higher and higher. The temperature rise of the machine tool spindle bearing is an important factor that limits the bearing speed. Under normal circumstances, the correct selection of bearing type, worse grade, configuration method, clearance (preload) size, lubricant and lubrication method, etc., can be to a certain extent Improve the high-speed performance of rolling bearings.

2. Life and carrying capacity. For heavy-duty machine tools or powerful cutting machine tools, the load-bearing capacity of the bearing should be filtered first. Because for general machine tools, the life of the spindle assembly refers to the life span of maintaining the accuracy of the spindle. Therefore, the accuracy of the bearing is required to meet the life requirements of the spindle assembly.

3. Rigidity and vibration resistance. In order to ensure the machining quality of the machine tool, the spindle system must have sufficient rigidity, otherwise there will be a large re-imaging error or even vibration. Vibration resistance refers to the ability to resist forced vibration and self-excited vibration. The vibration resistance of the main shaft assembly depends on the rigidity and damping of the main shaft and the bearing. The use of preloaded rolling bearings can effectively improve the rigidity of the spindle system.

4. Noise. In high-speed grinders, the noise of the grinding head bearing is an important component of the overall noise, and it is advantageous to select low-noise rolling bearings.

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