The speed of the CNC vertical lathe has a significant impact on the machining accuracy. Here are the main aspects of how rotational speed affects machining accuracy:

1. Cutting force: The speed of the CNC vertical lathe will directly affect the cutting force. Excessively high rotation speed of CNC vertical lathe may increase the cutting force, thereby increasing the friction between the CNC vertical lathe workpiece and the tool, causing vibration and unstable cutting, thereby reducing the machining accuracy.

2. Surface roughness: The choice of CNC vertical lathe speed has an important impact on the surface roughness of the workpiece. Excessively high rotational speed may cause the cutting temperature to be too high, making the surface of the CNC vertical lathe workpiece rough. On the contrary, the appropriate rotation speed of CNC vertical lathe can make the cutting process more stable, resulting in a smoother workpiece surface.

3. Thermal deformation: During the high-speed cutting process of CNC vertical lathe, due to the generation of friction heat and cutting heat, both the workpiece and the tool may undergo thermal deformation. Thermal deformation of CNC vertical lathe will directly affect the dimensional accuracy and shape accuracy of the workpiece. Therefore, choosing the appropriate speed for CNC vertical lathe and controlling the generation of cutting heat are important measures to maintain machining accuracy.

4. Tool wear: CNC vertical lathe speed also has a significant impact on tool wear. Excessively high speed of CNC vertical lathe will increase the wear of the tool and shorten the service life of the tool, thus affecting the machining accuracy of CNC vertical lathe. Therefore, when selecting the speed of CNC vertical lathe, factors such as the material, coating and wear of CNC vertical lathe tools need to be taken into consideration.

5. Resonance: In some cases, too high a rotational speed may cause the workpiece or machine tool to reach a resonance state, causing vibration and unstable cutting, thus reducing machining accuracy. Therefore, when selecting the rotation speed, it is necessary to avoid the resonance area of ​​the workpiece and the machine tool.

To sum up, the speed selection of CNC vertical lathe has an important impact on the machining accuracy. In the actual operation of CNC vertical lathe, it is necessary to comprehensively consider factors such as workpiece material, tool type, cutting depth and feed speed, and select the appropriate rotation speed to obtain the best processing accuracy and surface quality. At the same time, CNC vertical lathes also need to pay attention to controlling cutting heat and avoiding resonance and other issues to ensure the stability and accuracy of the CNC vertical lathe processing process.