There are many reasons why CNC vertical lathes produce vibration marks. Here are some common reasons:

1. Spindle bearing problem: Looseness or wear of the CNC vertical lathe spindle bearing may cause the axial force of the CNC vertical lathe spindle to move, resulting in vibration marks.

2. Improper adjustment of the center frame: The adjustment of the CNC vertical lathe center frame is crucial to maintaining the stability of the workpiece and reducing vibration. If the center frame of the CNC vertical lathe is improperly adjusted, it may cause the workpiece to vibrate during the machining process, thereby forming vibration marks.

3. Tool problems: The wear of CNC vertical lathe tools, the cutting edge is not sharp, or the tool bar is too long, which may lead to unstable cutting force and thus vibration marks. In addition, the unreasonable position of the CNC vertical lathe tool and the axis center of the coordinate axis, such as the tool tip position is too high or too low, may also lead to unstable cutting force and the generation of vibration marks.

4. Improper selection of cutting parameters: The selection of cutting parameters such as CNC vertical lathe cutting speed, cutting depth, and feed rate is crucial to the stability of the machining process. If the CNC vertical lathe cutting parameters are improperly selected, the cutting force may be unstable, resulting in vibration marks.

5. Insufficient rigidity of machine tools: The rigidity of CNC vertical lathes is very important for resisting cutting forces, reducing vibration and maintaining machining accuracy. If the rigidity of the CNC vertical lathe is insufficient, it may cause vibration during the cutting process, thereby forming vibration marks.

6. Unstable workpiece clamping: Unstable workpiece clamping of CNC vertical lathe may cause the workpiece to vibrate during the processing, resulting in vibration marks.

7. External interference: For example, unreasonable parameter settings of the CNC vertical lathe CNC system, external interference causing the system to lose synchronization, impedance mismatch between the system and the driver, etc., may lead to the loss of useful signals of the CNC vertical lathe, resulting in vibration patterns. .

In order to reduce or eliminate vibration marks on CNC vertical lathes, the following measures can be taken:

1. Regularly check the status of the CNC vertical lathe spindle bearings and replace worn bearings in a timely manner.

2. Reasonably adjust the center frame of the CNC vertical lathe to ensure that the workpiece remains stable during processing.

3. Regularly check the wear of CNC vertical turning tools, replace worn tools in time, and maintain the sharpness of the tools.

4. Reasonably select cutting parameters according to CNC vertical lathe processing materials and processing requirements.

5. Strengthen the rigidity of the CNC vertical lathe, optimize the machine tool structure, and improve the vibration resistance of the machine tool.

6. Ensure that the CNC vertical lathe workpiece is clamped firmly to reduce vibration during processing.

7. Check the parameter settings and external interference of the CNC system to ensure stable operation of the system.

To sum up, the reasons for vibration marks in CNC vertical lathes involve many aspects, including spindle bearings, steady rest, cutting tools, cutting parameters, machine tool rigidity, workpiece clamping and external interference. In order to obtain high-quality processing results, these factors need to be considered comprehensively and corresponding measures should be taken to reduce or eliminate vibration marks.