Abnormal noise in a CNC vertical lathe may be caused by many reasons. The following are some common possibilities:

1. Tool problems: Wear, breakage or improper installation of CNC vertical lathe tools may cause abnormal noise. Check whether the cutting tools are installed correctly and replace seriously worn cutting tools promptly.

2. Bearing failure: CNC vertical lathe bearing damage or insufficient lubrication may cause the bearing to make abnormal noise. Check whether the bearings are operating normally and replace damaged bearings in time.

3. Transmission system problems: Problems such as loose transmission belts, damaged gears or broken chains of CNC vertical lathes may cause abnormal noises. The CNC vertical lathe checks each component of the transmission system to ensure its normal operation.

4. Guide rail problems: Damage, poor lubrication or excessive wear of the CNC vertical lathe guide rails may cause abnormal noise. Check the condition of the guide rails and perform necessary lubrication and maintenance.

5. Machine tool structure problems: Looseness, deformation or damage of the CNC vertical lathe structure may cause abnormal noise. The CNC vertical lathe checks every part of the machine tool structure to ensure it is stable and intact.

6. Cooling system problems: Failure of the CNC vertical lathe's cooling system may lead to insufficient lubrication or overheating, causing abnormal noise. Check whether the cooling system is operating normally and repair faults promptly.

7. Program errors: There may be errors in the processing program of the CNC vertical lathe, resulting in abnormal processing and abnormal noise. CNC vertical lathe checks whether the processing program is correct and corrects the wrong parts in time.

8. Material problems: Poor quality or improper clamping of CNC vertical turning materials may cause abnormal noise. CNC vertical lathes ensure that good quality machining materials are used and the workpiece is clamped correctly.

For abnormal noise problems, it is very important to conduct timely investigation and repair to ensure the normal operation and processing quality of the CNC vertical lathe. If you cannot determine the cause of the problem, it is best to ask a professional technician to inspect and repair it.