CNC vertical lathe is an important machining method that can be used to automatically manufacture various complex parts. However, when processing the outer diameter of the workpiece, the problem of chatter marks sometimes occurs. So, what are the causes of this problem?

1. Improper tool cutting parameters: Improper setting of cutting parameters such as feed rate, cutting depth and cutting speed of CNC vertical turning tools may cause cutting oscillation and resonance, resulting in vibration marks on the surface of the workpiece. Too fast feed speed, cutting speed, and excessive cutting depth will increase the cutting force and cause instability of the cutting system.
2. Poor tool sharpening: Uneven tool wear, edge damage or poor sharpening quality will lead to vibration and instability during the cutting process, which will in turn cause chatter marks on the surface of the workpiece. Good quality tools are the key to avoiding chatter marks. It is necessary to regularly check the wear of the tools and replace or repair them in time.
3. Unstable tool support: Unstable tool support during CNC vertical lathe cutting may be caused by loose fixtures, insufficient tool holder rigidity, or unstable feed systems. This will cause cutting shock and vibration to be transmitted to the workpiece, causing the appearance of vibration marks on the outer diameter.
4. Uneven workpiece material or uneven surface hardness: If there are internal defects, uneven hardening or surface hardness differences in the CNC vertical lathe workpiece material, it will cause vibration and instability during the cutting process, resulting in vibration marks on the outer diameter of the workpiece.
5. Poor maintenance of machine tools and cutting tools: The rigidity and geometric accuracy of CNC vertical lathes are crucial to avoid vibration marks. Problems such as improper maintenance of machine tools and cutting tools, poor lubrication, or severe wear may cause vibration during the cutting process and chatter marks on the outer diameter of the workpiece.

In order to avoid chatter marks on the outer diameter of the workpiece, it is necessary to reasonably select the tool and cutting parameters to ensure good tool quality and sharpening conditions. In addition, accurate calibration and regular maintenance of CNC vertical lathes and cutting tools are also crucial.